Method and converter to produce ammonia

 

(57) Abstract:

The invention relates to a method for production of ammonia from synthesis gas and Converter for its implementation. The method of producing ammonia is that three separate stream of fresh synthesis gas to produce ammonia is introduced into the ammonia Converter, which contains at least two layers of catalyst arranged in series, and the second and third streams of synthesis gas pass through the stages of the heat exchanger, where they are heated by the flow coming from the first catalyst layer, the heated air streams are mixed with the first stream of synthesis gas is fed to the first catalyst layer, and partially converted synthesis gas is used for heating the second and third threads and served at least a second layer of catalyst. The invention improves the degree of heat recovery gas streams. 2 S. and 1 C.p. f-crystals, 2 Il.

The present invention relates to a method and Converter to produce ammonia from synthesis gas to produce ammonia. In particular, the present invention provides an improved method for the synthesis of ammonia, wherein reacting the synthesis gas in the Converter to produce ammonia containing at least two layers of catalyst is possible ammonia from synthesis gas, which uses two series-connected heat exchanger, and at the end of the process target product synthesis is subjected to indirect cooling of the fresh synthesis gas (see , for example, EP 0374564 A1, C 01 C 1/04, publ. 27.06.1990 or EP 0386693 A2, B 01 J 8/04, publ. 12.09.1990). So, get going gas product low temperature, which cannot be used as a coolant in the process of ammonia synthesis. Therefore, utilization of thermal energy of the gas flow is insufficient.

The objective of the invention is to develop a method to produce ammonia from synthesis gas, which improves the utilization of thermal energy of the gas flows.

The problem is solved in the method of producing ammonia, in which three separate stream of fresh synthesis gas to produce ammonia are introduced into the Converter to produce ammonia containing at least two layers of catalyst arranged in series, the first stream of fresh synthesis gas is fed to the first stage mixing gas, the second stream of fresh synthesis gas is fed to the first stage indirect heat exchange with the first stream leaving the first catalyst layer, and the third stream of fresh synthesis gas podaa the second output streams are formed by dividing the stream is partially converted synthesis gas, leaving the first catalyst layer, the first output stream is fed to the first stage indirect heat exchange, and the second output stream is fed to the second stage indirect heat exchange and thus the second and third streams of fresh synthesis gas is indirectly heated heat coming from the first and second output streams, heated second and third streams are fed to the step of mixing, to obtain a gas flow method of producing ammonia preheated streams of fresh synthesis gas is mixed and combined with the first stream of fresh synthesis gas, the process gas is fed to the first catalyst bed and the stream is partially converted synthesis gas is displayed, the first and second output streams are combined with the partially converted process gas and to obtain the product stream enriched in ammonia, partially converted process gas is supplied at least to the second catalyst bed.

According to the form of execution of the present invention the first layer is divided into a first part and a second part, and between the first and second part of the exiting gas is abruptly cooled.

The task is also solved in the ammonia Converter, designed the second catalyst layers, located sequentially, the first and second heat exchangers located downstream from the first catalyst layer, and the first and second heat exchangers are connected in parallel and adapted for indirect heating of the second and third streams of fresh synthesis gas to produce ammonia, and partially converted synthesis gas to produce ammonia is excreted in the first catalyst layer and is divided into a first flow and the second part stream and fed to the first and second heat exchangers, a first mixer for mixing the first and second heated flow of fresh gas to produce ammonia from the third stream of fresh synthesis gas to produce ammonia, a second mixer for mixing and combining the first and second parts of the stream is partially converted synthesis gas to produce ammonia, means for feeding the combined partially converted synthesis gas is at least the second layer of the catalyst.

The above method of synthesis of ammonia and the ammonia Converter according to the fundamental task of the present invention, particularly applicable for modernization of existing methods for producing ammonia and converters.

With a parallel arrangement of steps teploty product at high temperature.

An important advantage of the high temperature gas coming product corresponding to the present invention, is that to obtain the necessary steam as a heat carrier, you can use the gas product and not kolovou water, as by the usual method of synthesis of ammonia.

In the following detailed description of the present invention is illustrated in more detail by using the drawings, which represent the following:

in Fig. 1 is a simplified process diagram corresponding to a particular variant of implementation of the present invention;

in Fig. 2 - Converter ammonia corresponding to a particular variant of implementation of the present invention.

If we refer to Fig. 1 shows that the main stream of fresh synthesis gas to produce ammonia is divided into first, second and third streams 2, 4, 6. Stream 2 is fed to the area of mixing, where the flow 2 is mixed and combined with the threads 4 and 6. Prior to the merger with stream 2 stream 4 is heated by indirect heat exchange in heat exchanger 18C part 12 of the stream is partially converted synthesis gas to produce ammonia output in the stream 10 from the first layer of the catalyst to produce ammonia 16, the thread 6 Bodog the C-gas to produce ammonia. After heat transfer streams 4 and 6 of part streams 12 and 14 re-combine and mix on site mixing 22, and then the combined stream is fed to the second layer of catalyst to produce ammonia for further conversion of the thread 24. Product flow 28, enriched obtained by ammonia, is removed from the layer 26.

Converter to produce ammonia, used in the above method, shown in Fig. 2.

In Fig. 2 the Converter contains a cylindrical high pressure casing 20 with a narrowed upper part 40 of the first and second annular layers of catalyst to produce ammonia 60 and 80, arranged in series, the first heat exchanger 100, located in the center of the annular space layer 60 and the second heat exchanger 120, located in the upper part 40 of the housing 20. The heat exchangers 100 and 120 are parallel to the device for separating gas stream 140.

Fresh synthesis gas to produce ammonia enters the Converter three separate threads.

The first stream passes through the channel 160 on site mixing 180, located in the upper part of the housing 20. The second stream is directed through the channel 200, located in the upper part, on the area of the heat exchanger 100, converted to pipes, and t the th to the body. When passing through the heat exchangers 100 and 120 second and third flows indirectly heated by means of hot gas 240 extending from the catalyst layer 60 and is divided into two parts by using the separating device 120, and one part of the flow passes through the heat exchanger 100, and the second part of the flow passes through the heat exchanger 120. Then warm the second and third streams of synthesis gas to produce ammonia on site mixing 180 is combined with the first stream, and forms a gas for method of producing ammonia. The process gas passes through the layer 60 in the radial direction and in contact with the catalyst for ammonia synthesis, resulting in it turning into an output stream 240. Passing, as described above, heat of the second and third streams of synthesis gas to produce ammonia, separated flows leaving gas 240 are combined at the site of mixing 260, located between catalyst 60 and 80.

The combined output stream 280 then passes through the catalyst bed 80 in the radial direction due to contact with the catalyst for ammonia synthesis, forming a layer 80, is converted in the gas product 300, enriched with ammonia. The gas product is withdrawn from the Converter through the channel 320, u="ptx2">

1. The method of producing ammonia, in which three separate stream of fresh synthesis gas to produce ammonia are introduced into the Converter to produce ammonia containing at least two layers of catalyst arranged in series, the first stream of fresh synthesis gas is fed to the first stage mixing gas, the second stream of fresh synthesis gas is fed to the first stage indirect heat exchange of the first stream coming from the first catalyst layer, and the third stream of fresh synthesis gas is fed to the second stage indirect heat exchange with a second stream coming from the first catalyst layer, the first and second output streams are formed by dividing the stream is partially converted synthesis gas leaving the first catalyst layer, the first output stream is fed to the first stage indirect heat exchange, and the second output stream is fed to the second stage indirect heat exchange and thus the second and third streams of fresh synthesis gas is indirectly heated heat coming from the first and second output streams, heated second and third streams are fed to the step of mixing, to obtain a gas flow method of producing ammonia preheated streams of fresh synthesis gas smelyalata and the stream is partially converted synthesis gas is displayed, the first and second output streams are combined with the partially converted process gas and to obtain the product stream enriched in ammonia, partially converted process gas is supplied at least to the second catalyst bed.

2. The method according to p. 1, characterized in that the specific implementation of the present invention the first layer is divided into a first part and a second part, and between the first and second part of the exiting gas is abruptly cooled.

3. Converter ammonia containing high pressure casing at least first and second catalyst layers, arranged in series, the first and second heat exchangers located downstream from the first catalyst layer, and the first and second heat exchangers are connected in parallel and adapted for indirect heating of the second and third streams of fresh synthesis gas to produce ammonia, and partially converted synthesis gas to produce ammonia is excreted in the first catalyst layer and is divided into a first flow and the second part of the flow through the separating device and fed to the first and second heat exchangers, the first mixer for mixing the first and second heated thread is Italy for mixing and combining the first and second parts of the stream is partially converted synthesis gas to produce ammonia, means for feeding the combined partially converted synthesis gas is at least the second layer of catalyst.

 

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Reactor // 2246345

FIELD: chemical industry, catalytic processes.

SUBSTANCE: the invention presents a reactor for catalytic processes and is dealt with the field of chemical industry and may be used for catalytic processes. The reactor contains: a body; units of input and output for a reaction mixture and products of reactions; units of loading and unloading of a catalyst; a catalyst layer with the groups of the parallel hollow gas-permeable chambers located on it in height in one or several horizontal planes and each of the chambers has a perforated gas-distributing pipe with impenetrable butt connected to the group collector and used for input of additional amount of the reaction mixture. Each of perforated gas-permeable chambers is supplied with the second gas-distributing pipe with impenetrable butt. At that the impenetrable butts of the pipes are located on the opposite sides. The given engineering solution provides uniformity and entirety of agitation of the reaction mixtures.

EFFECT: the invention provides uniformity and entirety of agitation of the reaction mixtures.

5 cl, 4 dwg

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