Method of the waste waters sediment heating up for the anaerobic stabilization in the methane tank and the device for the method realization

FIELD: environmental protection; methods and devices for the waste waters sediment heating up for the anaerobic stabilization in the methane-tanks.

SUBSTANCE: the invention is pertaining to the field of the biological purification of the waste waters, in particular to anaerobic stabilization of the sediments in the methane-tanks for the waste waters purification facilities with the productivity of more than 50-100 thousand m3/day at the mesophilic (32-35°C) and the thermophilic (52-55°C) temperature modes. For the sediment heating up and its anaerobic stabilization in the methane-tank the raw sediment is loaded in the methane-tank, the partially stabilized sediment is withdrawn from the methane-tank, heat with the steam in the injector and after that load again in the methane-tank. At that the source steam is divided in the separator into the condensate and the dry steam. The crude sediment is loaded in the methane-tank after its mixing with the partially stabilized sediment and the condensate produced at separation of the source steam. The mixture including the partially stabilized sediment, the crude sediment and the condensate is heated up by the dry steam, which is fed to the inlet of an injector with the possibility of the flow control. The heating device of sediment for anaerobic stabilization in the methane-tank contains the methane-tank, the pipeline of the crude sediment feeding, the injector, the injector intake pipeline and the pressure pipeline, the source steam feeding pipeline, the separator, the condensate pipeline, the dry steam pipeline, the condensate discharge pipeline, and also the shut-off-control equipment. The technical result of the invention is the increased efficiency of the methane tank due to provision of the optimal mode of the heating, more thorough mixing of the sediment, minimization of the losses of the heat power and the increased reliability the service life of the used equipment.

EFFECT: the invention ensures the increased efficiency of the methane tank due to provision of the optimal mode of the heating, more thorough mixing of the sediment, minimization of the losses of the heat power and the increased reliability the service life of the used equipment.

7 cl, 1 dwg

 

The invention relates to the biological treatment of wastewater, in particular anaerobic stabilization of sludge digesters for sewage treatment plants with capacity of more than 50-100 thousand m3/days at mesophilic (32-35° (C) and thermophilic (52-55° (C) temperature.

Biological treatment in the digester there is a stabilization of precipitation, discharge in the sewage treatment process. At the same time provides disinfection of sludge due to the decomposition of organic matter in sediment as a result of vital activity of a complex of microorganisms to the final product, mainly methane and carbon dioxide. In this case, anaerobic stabilization of methane-producing bacteria represent a trophic chain primary and secondary anaerobes, namely enzymatic calatagan, acetogenic forming N2acetogen using H2, methanogens, reducing CO2the methanogens that use acetate. Because acetogenic and especially methanogens are very sensitive to the process conditions, the stage of formation of methane is significantly dependent on these conditions.

Because the digesters are to complicated and expensive, but very effective structures, ensuring a high quality of digested sludge and the production of energy in form of biogas, their slave is the intensify, in particular by heating the precipitate.

The precipitate may be heated by means of heat exchangers, it is also possible to heat the sludge in a separately standing capacity. As an example of the method of heating the sludge can result in RF patent №2014313, IPC C 05 F 3/00, C 02 F 11/04 "Method of processing organic waste, in which the sludge bubbled directly into the digester extracted from biogas carbon dioxide. The disadvantages of this method include low efficiency of heating.

One way of heating the precipitate is heated sludge with live steam from a steam injection heater (injector), which is a device through which circulates fermentation residue under the action of the kinetic energy of water vapor.

In the prior art there are known various methods of heating the precipitate steam. For example, the method described in the book "Sewerage and sewage treatment" under the General editorship Y. Voronov, Moscow 2002, str, Publishing house Association building universities. In this method, low pressure steam with a temperature 110-112°served in the suction pipe of the pump with the flow and mixing of sediment or directly into the digester through the steam injector (ibid.).

The disadvantages of these methods of heating the precipitate include the following. When installing the injector directly into mutanten the e is overheating of sediment, what contributes to the destruction of methane-producing bacteria, the decrease in the biogas production and the establishment of the "outside" area. When submitting a sharp pair in the suction pipe of the pump with the flow and mixing of the sludge thermal and cavitation functional inactivation of biomass.

In the prior art there is also known a method of heating the sludge for anaerobic stabilization in the digester, in which raw sludge is loaded into the digester, partially stabilized in the digester sludge away from the digester and fed into the injector, heated by steam, and subsequently heated sediment load in the digester, the digester serves simultaneously stable product at 35-50°and biologically active substance is heated to 100° (A.S. USSR №1428718, IPC C 02 F 11/04), taken as a prototype.

The disadvantage of this method of heating the sludge for anaerobic stabilization in the digester is the presence of significant losses of kinetic and thermal energy of the steam, the presence of cavitation and rapid wear of the injector and valves due to the high humidity of the mixture of steam and heated sludge, insufficient mixing of the source and partially stabilized sludge, as well as uneven heating of the sludge in the digester.

The prior art known to the device heating the sludge for anaerobic stabilization is the digester, containing the digester, the injector supply line raw sludge piping and shut-off and control valves, the water and wastewater treatment" under the General editorship Wowowowow, Moscow 2002, str, Publishing house Association building universities.

In the prior art it is also known device heating the sludge for anaerobic stabilization in the digester containing the digester, the pipe feeding the raw sludge suction pipe injector, pressure pipe injector, the supply line of the original pair, as well as shut-off and control valves, where one of the outputs of the digester is communicated with the inlet of the injector through the suction pipe injector, and one of the inputs of the digester is in communication with the outlet of the injector through a discharge pipe injector (USSR author's certificate 1428718, IPC C 02 F 11/04), taken as a prototype.

The disadvantages of these devices heat the sludge include the following. The velocity of the steam entering the injector, typically very large (10-12 m/s), in addition, capture the steam drain sludge in the presence of always existing pulsations during expiration pair leads to strong impact of water on the nozzle of the injector, so even a negligible content of the condensate drops in a couple leads to rapid wear of the nozzle of the injector, even if making it from wear-resistant mA the materials. For example, the service life of the nozzle of wear-resistant steel does not exceed five months. During the repair work is interrupted processing of sludge in the digester, reduced work efficiency.

The disadvantage of these devices heat the sludge is also the presence of zones of overheating sludge in the digester, resulting in the death of methane-producing bacteria.

The objective of the invention is to increase the efficiency of the digester due to optimal heat more complete mixing of sludge minimization of heat loss and improve the reliability and durability of the equipment used.

The objective of the invention is solved by a method of heating the sludge for anaerobic stabilization in raw digester sludge is loaded into the digester, partially stabilized sludge away from the digester and fed into the injector, heated by steam, and then download again in the digester, and the source couples to the feed injector is separated into condensate and dry steam, wet sediment load in the digester after it is mixed with the partially stabilized sludge and condensation obtained by dividing the original pair, and heated in the injector mixture of partially stabilized sludge, raw sludge and condensation with superheated steam, which served on the entrance of the injector is adjustable flow.

In some cases, of the execution of the method of heating the sludge for anaerobic stabilization in the digester is characterized by the following features: the original pairs served under a pressure which is higher than the pressure of the column of sludge in the digester; source pairs are divided into condensate and dry steam in the separator; the crude residue is mixed with partially stabilized sludge and condensation on the suction side of the injector; the flow of dry steam regulate with shut-off and control device in the form of a ball valve.

The objective of the invention is also solved due to the fact that the device is heating the sludge for anaerobic stabilization contains the digester, the pipe feeding the raw sludge suction pipe injector, pressure pipe injector, the supply line of the original pair, as well as shut-off and control valves, where one of the outputs of the digester is communicated with the inlet of the injector through the suction pipe injector, and one of the inputs of the digester is in communication with the outlet of the injector through a discharge pipe injector, and the device is heated sludge for anaerobic stabilization additionally includes a separator, pipeline condensate pipeline dry steam, and the supply line of the original pair communicated with the inlet of the separator, a first outlet of the separator is communicated through drobopro the d of condensate, running at least one locking device, a check valve, steam trap, with the suction pipe of the injector, which reported the pipeline supply of raw sludge that has at least one locking device, and the suction side of the injector, to place the message in a supply line of raw sludge have at least one shut-off device, a second output of the separator is communicated with the inlet of the injector through line dry steam that has at least one shut-off and control device, the delivery pipe injector is installed at least one locking device.

In the particular case of execution in the device heating the sludge for anaerobic stabilization in the digester on the pipeline condensate trap installed closer to the cage, a locking device is installed closer to the intake pipe injector, and a check valve mounted between them.

The method of heating the sludge for anaerobic stabilization in the digester, the implementation of which is illustrated shown in the drawing scheme is as follows.

Raw sludge is fed directly into the suction pipe of the injector 2, which serves also partially stabilized about what ADOC of the digester 1. Source pairs are served in the separator 7, where it is divided into dry steam and condensate. The condensate is served in the suction pipe of the injector 2 and the condensate pipeline 8. Thus, the injector 3 serves a mixture of raw and partially stabilized sludge condensate, where this mixture is heated and stirred by the action of dry steam, which is served by pipeline dry steam 12 to control the flow of dry steam with shut-off and control device 13, for example ball valve disk or valve. Under pressure dry steam heated mixture is loaded into the digester 1.

The supply of raw sludge is carried out, for example, by a pump, and the feed mixture in the injector 3 is due to the vacuum generated in the flow of dry steam to the injector 3.

Getting steam piping condensate 8 prevents using trap 11 in the form of a trap, in which pairs occupy the upper part, and the condensate is lower, while the junction of the trap 11 condensate pipeline 8 is chosen so that it does not exceed the level of condensed liquid in the trap 11.

The pressure source pair is chosen so that it exceeds the value of the pressure level of sludge in the digester 1, and the excess pressure under the hood of the digester 1. Thus the two is that the discharge flow of the heated mixture of raw sludge, condensate and partially stabilized sludge in digester 1 under pressure dry steam.

The drawing shows a diagram of the device of the heated sludge to anaerobic stabilisation.

In the heat of sludge for anaerobic stabilization in the digester is one of the outputs of the digester 1 is communicated with the suction pipe of the injector 2 to the input of the injector 3. On the suction side of the injector 2 has a locking device 4, for example, in the form of a valve. The suction pipe of the injector 2 is communicated with the supply line of raw sludge 5 that has a locking device 6, for example, in the form of a valve. The suction pipe of the injector 2 is communicated with the first outlet of the separator 7, which serves to separate source of steam to the condensate and dry steam through the pipe condensate 8, which serves to supply the condensed moisture of the original pair. On the condensate pipeline 8 installed locking device 9 in the form of a ball valve, a check valve 10 and the valve 11 in the form of a water seal to prevent the ingress of steam into the condensate pipeline 8. Separator inlet 7 communicates with the supply line of the original pair 16. The second output of the separator 7 is communicated with the inlet of the injector 3 through line dry steam 12 installed shut-off and control device 13 in the form of a ball is the first crane, allows you to dispense a flow of dry steam is fed to the input of the injector 3. The output of the injector 3 is communicated with one of the inputs of the digester 1 through the discharge pipe 14, which is used to download the heated mixture of raw sludge, condensate and partially stabilized sludge. On the delivery pipe 14 installed locking device 15, such as a latch.

Device heating the sludge for anaerobic stabilization works as follows. Partially stabilized sludge from the digester 1 is supplied through the open valve 4 into the suction pipe of the injector 2, which is also through the open valve 6 to the pipe feeding the raw sludge 5 receives crude residue.

The original steam at a temperature of more than 100°With the supply line of the original pair 16 is supplied to the separator 7, where it is divided into dry steam and condensate, while ensuring the separation of water droplets from reaching the coefficient condensate recovery 0.97 at its optimum speed the passage of steam from the point of view of separation of liquid droplets (10-12 m/sec). Dry steam by pipeline dry steam 12 is supplied to the injector 3. A mixture of raw and partially stabilized sludge through inlet pipe of the injector 2, which also flows and the condensed moisture on the condensate pipeline 8 of the separator 7 is supplied to the injector 3.

Due to hot with the steamboat pair a mixture of raw and partially stabilized sludge condensate is heated in the injector, and then under the pressure of the steam fed into the digester.

To ensure a smooth expires pair can be used basicality injector 3 with sloping walls of the nozzle.

The locking device 9 is used to enable repair or replacement of the check valve 10, in case of its failure, that provides additional protection for the entire system.

The steam flow is regulated shut-off and control device 13, providing the required temperature of heating of sludge depending on the structural composition of the incoming raw sludge, as well as its flow and consistency.

Through the supply of raw sludge into the suction pipe of the injector 2, and, as a consequence, the flow in the digester 1 is already heated sludge is achieved by ensuring optimal temperature in the digester 1, which positively affects the activity of methane-producing bacteria, improves the performance of the process of anaerobic stabilization of sludge and produce biogas.

By supplying the injector 3 dry steam reduces the load on the injector nozzle 3, and a locking-regulating device 13, thereby increasing the durability and reliability of the entire system.

In the proposed invention due to the receipt of condensate into the suction pipe of the injector 2 is more complete with the storage of thermal energy source pair and minimized power losses compared to the prototype. Also ensure optimum temperature of operation and more complete mixing of sediment by supplying the heated mixture to temperatures that are required when working in conditions of mesophilic and thermophilic conditions (32-35°and 52-55°respectively), does not occur, unlike the prototype, overheating metanoobrazuyushchimi bacteria and there is no area of overheating.

The presence of shut-off and control device 13, through which the regulation of the steam flow, allows remote control of the steam flow.

In General, the invention has enabled to improve the efficiency of the digester 1 through optimal heating mode, a more complete mixing of sludge minimization of heat loss and improve the reliability and durability of the equipment used.

1. The method of heating the sludge for anaerobic stabilization in the digester, in which raw sludge is loaded into the digester, partially stabilized sludge away from the digester and fed into the injector, heated by steam, and then download again in the digester, wherein the source couples to the feed injector is separated into condensate and dry steam, wet sediment load in the digester after it is mixed with the partially stabilized sludge and condensate, obtained by divided the original pair, and heated in the injector mixture of partially stabilized sludge, raw sludge and condensation with superheated steam, which is fed to the input of the injector with flow control.

2. The method of heating the sludge for anaerobic stabilization in the digester according to claim 1, characterized in that the source pairs are served under a pressure which is higher than the pressure of the column of sludge in the digester.

3. The method of heating the sludge for anaerobic stabilization in the digester according to claim 1, characterized in that the source pairs are divided into condensate and dry steam in the separator.

4. The method of heating the sludge for anaerobic stabilization in the digester according to claim 1, characterized in that the crude residue is mixed with partially stabilized sludge and condensation on the suction side of the injector.

5. The method of heating the sludge for anaerobic stabilization in the digester according to claim 1, characterized in that the flow of dry steam regulate with shut-off and control device in the form of a ball valve.

6. Device heating the sludge for anaerobic stabilization in the digester containing the digester, the pipe feeding the raw sludge suction pipe injector, pressure pipe injector, the supply line of the original pair, as well as shut-off and control valves, where one of the outputs of the digester is communicated with the inlet of the injector sucking through the second tubing injector, and one of the inputs of the digester is in communication with the outlet of the injector through a discharge pipe of the injector, characterized in that it additionally includes a separator, pipeline condensate pipeline dry steam, and the supply line of the source pair is communicated with the inlet of the separator, a first outlet of the separator is communicated through the pipeline condensate that has at least one locking device, a check valve, steam trap, with the suction pipe of the injector, which reported the pipeline supply of raw sludge that has at least one locking device, and the suction side of the injector to places the message in a pipe feeding the raw sludge is installed, at least one locking device, the second output of the separator is communicated with the inlet of the injector through line dry steam that has at least one shut-off and control device, the delivery pipe injector is installed, at least one locking device.

7. Device heating the sludge for anaerobic stabilization in the digester according to claim 6, characterized in that the pipe condensate trap installed closer to the cage, a locking device is installed closer to the intake pipe injector, and reverse the second valve mounted between them.



 

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