The method of use of the exhaust heat in the process of recovering carbon dioxide

 

The invention relates to a method of using the heat removed from the process of recovering carbon dioxide. The method includes cooling the waste gaseous products of combustion in the tower (21), the contact of the cooled products of combustion in the absorption tower (22) with the regenerated absorbent liquid coming from the regeneration tower (23), at the bottom of the absorption tower (22) accumulated liquid with absorbed carbon dioxide, heating the liquid with the absorbed carbon dioxide due to heat transfer (35) with the regenerated absorbent liquid coming from the regeneration tower (23), the supply of heated liquid with absorbed carbon dioxide in the regeneration tower (23), heating of the bottom of the regeneration tower (23) using saturated steam, for separation of liquid with the absorbed carbon dioxide to carbon dioxide and regenerated absorbent liquid, the release and recovery of the separated carbon dioxide from the regeneration tower (23). Return hot water is heated by at least one heat transfer, selected from the group comprising heat exchange (37) with the regenerated absorbent liquid after tepley water after heating the bottom of the regeneration tower (23), resulting in getting hot water. The invention allows to obtain at low cost a large amount of hot water. 3 C.p. f-crystals, 4 Il.

The BACKGROUND TO the INVENTION

The present invention relates to a method of using the heat removed from the process of recovering carbon dioxide.

Usually a large amount of exhaust heat generated in the process of recovering carbon dioxide due to the waste gaseous products of combustion, cooled by cooling water. In the local area in which a large number of cooling water cannot be provided, a large amount of exhaust heat is cooled by the cooling air. Consequently, a large number of low-temperature exhaust heat is removed without the use of.

The famous hot water supply system to the consumer, as shown in Fig.4, which uses the heat produced by the power plant.

More specifically, in this system, steam from the boiler 101 serves on the steam turbine 102, and the generator 103 produces electricity. The steam is condensed by means of condenser 104 and returns to the boiler 101 by means of a pump 105. With the I from the system supply hot water to the consumer, by means of the heat exchanger 106. When this return hot water is heated and re-enters the hot water supply system to the consumer. The condensate obtained by heat exchange with low pressure steam returns to the boiler 101 by means of a pump 107.

In the famous hot water supply system to the consumer, as a result of selection with low pressure steam from the steam turbine 102, the output power of the steam turbine 102 is reduced, leading thus to reduce the volume of generated electric power.

BRIEF description of the INVENTION

The present invention is to provide a method of using the heat removed from the process of recovering carbon dioxide, which is the heating return hot water through the use of a large number of exhaust heat generated in the process of recovering carbon dioxide from flue gas products of combustion, so that may be obtained a large amount of hot water, for example, for submission to the supply system hot water consumers, local heating, and the like.

In accordance with the first aspect of the present invention, it is proposed a way to use those use the recovery block of carbon dioxide, which contains the tower, absorption tower for absorption of carbon dioxide by using absorbent liquid, and a regeneration tower for regeneration of the absorbent liquid;

feeding the waste gaseous products of combustion into the cooling tower for cooling the waste gaseous products of combustion;

the flow of cooled exhaust gaseous products of combustion in the absorption tower so that they come into contact with the regenerated absorbent liquid coming from the regeneration tower for absorption of carbon dioxide from the exhaust combustion gases from the regenerated absorbent liquid, resulting in the bottom of the absorption tower accumulated absorbent liquid with absorbed carbon dioxide;

the heated absorbent liquid with absorbed carbon dioxide by heat exchange with the regenerated absorbent liquid coming from the regeneration tower;

circulating heated absorbent liquid with absorbed carbon dioxide in the regeneration tower;

heating of the bottom of the regeneration tower using saturated steam in order to produce the separation of the absorbent liquid with absorbaloff the tion separated carbon dioxide from the regeneration tower,

and return hot water is heated by at least one heat transfer, selected from the group comprising heat exchange with the regenerated absorbent liquid after heat exchange, the heat exchange with the carbon dioxide removed from the regeneration tower, and the heat exchange with saturated water after heating the bottom of the regeneration tower, resulting in getting hot water.

The way to use the heat removed from the process of recovering carbon dioxide in accordance with the present invention, as the waste gaseous products of combustion can be used flue gases from a boiler or gas turbine power plant.

These and other features and advantages of the invention will be more apparent from the subsequent detailed description of its preferred options, data as an example, do not have restrictive and described with reference to the accompanying drawings, which are an integral part of the present invention.

BRIEF DESCRIPTION of DRAWINGS

In Fig.1 shows a schematic drawing of the power plant, which includes the recovery block of carbon dioxide and can be used for assests aseason invention.

In Fig.2 shows a schematic drawing, which shows in detail the recovery block of carbon dioxide Fig.1.

In Fig.3 shows a schematic drawing of the heat exchange return hot water in accordance with the present invention.

In Fig.4 shows a schematic drawing of a traditional hot water system to a consumer, which use heat from the power plant.

DETAILED description of the INVENTION

Way to use the heat removed from the process of recovering carbon dioxide in accordance with the present invention, will be described hereinafter with reference to the accompanying drawings.

In Fig.1 shows a schematic drawing of the power plant, which includes the recovery block of carbon dioxide in Fig.2 shows in detail the recovery block of carbon dioxide Fig.1, and Fig.3 shows a diagram of the heat exchange return hot water.

The boiler 1 is connected with a steam turbine 3 is connected with the generator 2 via line 101. Steam turbine 3 is also connected to the boiler 1 via line 102that sequentially switched capacitor 4 for condensing steam and pump 5.

The boiler 1 is connected to block recovery of carbon dioxide 20 through line 103The tower 21 is connected to the boiler 1 via line 103. Cooling tower 21 includes a contact element gas-liquid 24. The ends of the circulation line 104connected with the bottom and top section of the tower 21. The first pump 25 and the first heat exchanger 26 are sequentially included in the circulation line 104from the bottom of tower 21. Cooling water is sprayed in the upper section of the tower 21 through line circulation 104so that the waste gaseous products of combustion introduced by line 103, cooled with a contact element gas-liquid 24. The top of the tower 21 is connected with the lower section of the absorption tower 22 through line 105in which you have entered intake fan 27.

Absorption tower 22 includes upper and lower contact elements gas-liquid 28a and 28b. Plot plum 29 for the regenerated absorbent liquid is provided between the contact elements of the gas-liquid 28a and 28b. You can also line 106which one end is connected with a plot of drain 29 of the absorption tower 22, and the other end connected to the block located in the upper part of absorption tower 22 over the contact element is replaced with the top of the absorption tower 22.

The regeneration tower 23 includes upper and lower contact elements gas-liquid 33a and 33b. The bottom of the absorption tower 22 is connected through line 107with the upper section of the regeneration tower 23 located between the upper and lower contact elements of the gas-liquid 33a and 33b. The pump 34 and the third heat exchanger 35 is consistently included in line 107side absorption tower 22.

The bottom of the regeneration tower 23 is connected through line 108that passes through the third heat exchanger 35, with the upper section of the absorption tower 22, which is part of the drain 29. The pump 36 is introduced in line 108between the bottom of the regeneration tower 23 and the third heat exchanger 35. The fourth heat exchanger (cooler absorbent liquid) 37 entered in line 108between the third heat exchanger 35 and the absorption tower 22. The return line hot water 109passes through the fourth heat exchanger 37, as shown in Fig.2 and 3. When the return flow of hot water through the return line to the hot water 109there is a heat exchange with the fourth heat exchanger 37.

One end of the line 1010connected to the lower section of the regeneration tower 23 and the other end of the line 1010connected with uchastke 38 and the fifth heat exchanger 39 is consistently included in line 1010from the bottom portion of the regeneration tower 23. Through the fifth heat exchanger 39 is also skipped line 1011through which saturated steam enters, due to which there is heat transfer to saturated steam.

One end of the line 1012connected to the top of the regeneration tower 23 and the other end of the line 1012connected with the separator gas-liquid 41 through sixth heat exchanger (coolant return flow) 40. Carbon dioxide separated in the separator gas-liquid 41, Recuperat through the discharge pipe 42. As shown in Fig.2 and 3, the return line hot water 109that passes through the fourth heat exchanger 37, skipped through sixth heat exchanger 40. When the return flow of hot water through the return line to the hot water 109there is a heat exchange with the sixth heat exchanger 40. The separator gas-liquid 41 is connected with the upper part of the regeneration tower 23 through line 1013in which you have entered the pump 43.

As shown in Fig.1 and 3, the return line hot water 109that passes through the sixth heat exchanger 40, passes through the seventh heat exchanger 44 through which the skipped line 1011where runs rich water. When applying the who is the IR 44.

Way to use the heat removed from the process of recovering carbon dioxide will be described hereinafter with reference to the power plant, which includes the recovery block of carbon dioxide (Fig.1-3).

Steam, which is produced in the boiler 1 is fed to a steam turbine 3 through line 101while the generator 2 generates electricity. The steam from the steam turbine 3 is available on line 102the capacitor 4, in which the condensation of the steam. The resulting condensate return to the boiler 1 by means of a pump 5.

The waste gaseous products of combustion generated in the boiler 1, is fed into the cooling tower 21 block recovery of carbon dioxide 20 line 103. Purified water, which is pumped through the bottom of tower 21 by means of the first pump 25 is cooled when it passes through the circulation line 104that includes the first heat exchanger 26. Cooling water is sprayed at the top of the tower 21, resulting in the cooling of the exhaust combustion gases introduced through line 103with the help of the contact element gas-liquid 24.

When you enable the discharge of the fan 27 cooled exhaust gaseous products of combustion coming from the top Greene, introduced into the absorption tower 22, flows up through the lower contact element gas-liquid 28b absorption tower 22, they come into contact with the regenerated absorbent liquid, for example with the regenerated liquid amine, which serves in the area of the drain 29 of the absorption tower 22. When this carbon dioxide in the waste gaseous products of combustion is absorbed by using the regenerated liquid amine, resulting in a gain liquid amine with absorbed carbon dioxide. The regenerated liquid amine is supplied from the regeneration tower 23 in the area of the drain 29 of the absorption tower 22 through line 108that passes through the third and fourth heat exchangers 35 and 37. When the waste gaseous products of combustion flow through the area of the drain 29 and then up through the upper contact element gas-liquid 28a, they come into contact with the regenerated liquid amine fed to the upper part of the absorption tower 22, resulting in carbon dioxide, which is contained in the waste gaseous products of combustion, absorbed regenerated liquid 1 Amin, you get a liquid amine with absorbed carbon dioxide. At this time, the waste gaseous products SGAs who we are. When the pump 30 and the regenerated liquid amine is fed into the upper part of absorption tower 22 through line 106. The waste gaseous products of combustion, of which the removed carbon dioxide, are released into the atmosphere through the exhaust pipe 32.

Liquid amine with absorbed carbon dioxide accumulates at the bottom of the absorption tower 22. When the pump 34 accumulated liquid amine with absorbed carbon dioxide flows through line 107in the regeneration tower 23, the area between the two contact elements of the gas-liquid 33a and 33b. At this time, the liquid amine, which has absorbed carbon dioxide, is heated by heat exchange in the third heat exchanger 35. The third heat exchanger 35 is located at the intersection of lines 107and 108. The regenerated liquid amine with a relatively high temperature at the bottom of the regeneration tower 23, flows through line 108, resulting in a regenerated liquid amine is cooled.

The heated liquid amine with absorbed carbon dioxide is separated into carbon dioxide and regenerated liquid amine, when it flows down through the lower contact element gas-liquid 33b regeneration tower 23. At this time, enabling sub>10that includes the fifth heat exchanger 39. When this regenerated liquid amine performs heat exchange with saturated steam, which enters in the fifth heat exchanger 39 through line 1011in the result it heats up. The regenerated liquid amine heated through the fifth heat exchanger 39, used as a source of heat for heating the regeneration tower 23.

The regenerated liquid amine separated in the regeneration tower 23, accumulates at the bottom of the regeneration tower 23. When the pump 36 regenerated liquid amine from the bottom of the regeneration tower 23 is returned to the absorption tower 22 through line 108.

Separated carbon dioxide flowing upward through the upper contact element gas-liquid 33a regeneration tower 23 and flows through line 1012from the top of the regeneration tower 23. During this period of time separated carbon dioxide is cooled by means of the sixth heat exchanger 40, is introduced in line 1012when this occurs, the condensation of the water vapor carried along with carbon dioxide. Carbon dioxide then enters the separator gas-liquid 41 and is separated into carbon dioxide and liquid amine. Carbon dioxide Recuperat is use the process of recovering carbon dioxide, return hot water is fed into the return line to the hot water 109, which entered the fourth, sixth, and seventh heat exchangers 37, 40 and 44, as shown in Fig.1-3. At this time, return hot water flowing through the return line hot water 109performs heat exchange, primarily in the fourth heat exchanger 37, the liquid amine, which has a temperature of, for example, from 60 to 70From flowing through line 108, passed through the fourth heat exchanger 37. Thus, the return hot water is heated. Then return hot water makes the heat transfer in the sixth heat exchanger 40 with carbon dioxide and water vapor at a temperature of, for example, from 90 to 100With that produced from the regeneration tower 23 and flow through the line 1012, passed through sixth heat exchanger 40. As a result of return hot water is heated even more. Finally, return the hot water makes the heat transfer in the seventh heat exchanger 44 with saturated water at a temperature of, for example, from 120 to 140, Which flows through line 1011that skipped through the seventh heat exchanger 44. As a result of return hot water is heated to the .3, return hot water temperature 20With performs heat exchange in the fourth heat exchanger 37 and heated up to 55C. After this return hot water makes the heat transfer in the sixth heat exchanger 40 and is heated up to 85C. Finally, return the hot water makes the heat transfer in the seventh heat exchanger 44 and is heated up to 100With, to a predetermined temperature hot water. When the return hot water enters the heat exchangers in this way, from the heat exchanger at a lower temperature in the heat exchanger with a higher temperature, it can be heated effectively to a predetermined temperature.

Thus, in accordance with the present invention, in the process of recovering carbon dioxide from flue gas combustion products obtained from such a source the waste gaseous products of combustion, such as the boiler is heating return hot water through the use of a greater part of the exhaust heat, which is obtained at the expense of the recovery process and which is usually cooled by means of cooling water and remove. The investigator is for other purposes.

When the method of using exhaust heat in accordance with the present invention applied to a power plant having a boiler, hot water to the user can be obtained through the process of recovering carbon dioxide, without selection with low pressure steam from the steam turbine, as is done in traditional systems of water heating. Consequently, it is possible to avoid reducing the power output of the steam turbine, which occurs when the selection has a low vapor pressure.

In the described embodiment of the present invention, the hot water was obtained by heating return hot water using the fourth, sixth and seventh heat exchangers 37, 40, and 44, but it should be borne in mind that the present invention is not limited to this option. For example, hot water may be obtained by heating return hot water using any one of the fourth, sixth and seventh heat exchangers 37, 40, and 44, or two or more of them. When using two heat exchanger or more heat exchangers, order hot water in the heat exchangers is not the limiting factor.

In the described embodiment, the hot water was what Blinnikov 37, 40, and 44, through which flows a fluid with a relatively high temperature, but it should be borne in mind that the present invention is not limited to such a case. For example, to heat hot water by heat exchange in the fourth heat exchanger 37 it can be heated by heat exchange in the first or second heat exchangers 26 and 31 (or both of them), shown in Fig.2. Note that the cooling water has a temperature of, for example, from 20 to 50C, flows through the first heat exchanger 26, while the cooling water has a temperature of, for example, from 20 to 50C, flows through the heat exchanger 31. Fluid temperature, lower the temperature of the fifth, sixth and seventh heat exchanger, flows through the first and second heat exchangers 26 and 31.

Note that the source of production waste gaseous products of combustion do not necessarily have to be the boiler.

As described previously, in accordance with the present invention proposes a method of using exhaust heat generated in the process of recovering carbon dioxide from the waste gaseous products of combustion for heating return hot water, midrange is some cost a large amount of hot water for heating or the like.

Despite the fact that have been described preferred embodiments of the invention, it is clear that it specialists in this field can be amended and supplemented, which do not extend, however, beyond the scope of the following claims and are consistent with its spirit.

Claims

1. The method of use of the exhaust heat recovery process of carbon dioxide, which includes the following operations: using block (20) recovery of carbon dioxide, which contains the tower (21), absorption tower (22) for absorption of carbon dioxide by using absorbent liquid and a regeneration tower (23) for the regeneration of the absorbent liquid; feeding the waste gaseous products of combustion in the tower (21) for cooling the waste gaseous products of combustion; the flow of cooled exhaust gaseous products of combustion in the absorption tower (22) so that they come into contact with the regenerated absorbent liquid, coming from the regeneration tower (23) for absorption of carbon dioxide from the exhaust combustion gases from the regenerated absorbent liquid in the IOM carbon; the heated absorbent liquid with absorbed carbon dioxide due to heat transfer (35) with the regenerated absorbent liquid coming from the regeneration tower (23); feeding the heated absorbent liquid with absorbed carbon dioxide in the regeneration tower (23); heating the bottom of the regeneration tower (23) using saturated steam to separate the absorbing liquid with the absorbed carbon dioxide to carbon dioxide and regenerated absorbent liquid; the release and recovery of the separated carbon dioxide from the regeneration tower (23), in which the return hot water is heated by at least one heat transfer selected from the group comprising heat exchange (37) with the regenerated absorbent liquid after heat exchange, heat exchange (40) with carbon dioxide, are removed from the regeneration tower (23), and heat transfer (44) saturated with water after heating the bottom of the regeneration tower (23), resulting in getting hot water.

2. The method according to p. 1, characterized in that the exhaust combustion gases are exhaust gases from the boiler (1) or a gas turbine power plant.

3. The method according to p. 1, characterized in that the abs is Renaut first using heat (37) with the regenerated absorbent liquid after heat exchange, then using heat (40) with carbon dioxide, are removed from the regeneration tower (23), and, finally, with the help of heat transfer (44) saturated with water after heating the bottom of the regeneration tower (23), resulting in getting hot water.

 

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