CN215048696U - Synthetic ammonia refrigerating system purge gas recycling device - Google Patents
Synthetic ammonia refrigerating system purge gas recycling device Download PDFInfo
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- CN215048696U CN215048696U CN202120489099.1U CN202120489099U CN215048696U CN 215048696 U CN215048696 U CN 215048696U CN 202120489099 U CN202120489099 U CN 202120489099U CN 215048696 U CN215048696 U CN 215048696U
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Abstract
The utility model discloses a synthetic ammonia refrigerating system relaxs gassing recycle device, including washing the ammonia tower, synthetic ammonia relaxs gassing recovery pipeline, desalting water pipeline, aqueous ammonia recovery pipeline and inert gas exhaust pipe, synthetic ammonia relaxs the one end of gassing recovery pipeline and is connected with the cold ware of the self-assembling formula ammonia in the synthetic ammonia refrigerating system, the other end and wash the first access connection that the ammonia tower is located the middle part, desalting water pipeline and wash the second access connection that the ammonia tower is located the top, inert gas exhaust pipe is connected with the gas discharge mouth that the ammonia tower is located the top of washing, aqueous ammonia recovery pipeline's one end and the liquid discharge mouth that the ammonia tower is located the bottom of washing are connected. The device provided by the utility model can recover a large amount of intermediate product ammonia which is high in content in the purge gas and is used as the raw material for synthesizing the urea, thereby reducing the production cost, solving the problem of ammonia waste, and having simple and advanced technical level and strong operability; and the desalted water is used for washing and recovering, so that the introduction of impurity ions is reduced, and the normal operation of the system is ensured.
Description
Technical Field
The utility model relates to the technical field of synthetic ammonia industry, in particular to a purge gas recycling device of a synthetic ammonia refrigeration system.
Background
Currently, in the synthetic ammonia production process, the composition of the purge gas of the synthetic ammonia is generally H2、N2、CH4、Ar、NH3And the like, in the past, people usually directly exhaust the exhausted synthetic ammonia purge gas or directly introduce the exhausted synthetic ammonia purge gas into an exhaust gas boiler to be burnt as fuel, and the ammonia gas in the purge gas is exhausted into the atmosphere or directly burnt as fuel, so that the system consumption is increased, the production cost is high, the development and production strategy of circular economy and clean production advocated in China is not met, and according to the current technical level of China, about 150-250Nm & ltN & gt can be generated for each synthetic ammonia production3According to conservative estimation, the production capacity of the synthetic ammonia in China is about 1.5 million tons/year at present, and if the ammonia gas in the purge gas is purified into ammonia gas with the purity of more than or equal to 90 percent for the production of the synthetic ammonia, 100 million Nm can be recovered every year3The air is exhausted with great prospect.
In the prior art, the original design of the purge gas generated by the synthetic refrigeration system of the synthetic ammonia plant recovers a part of ammonia by condensing the purge gas through a purge gas quencher 160-C, most of the remaining unrecovered purge gas is sent to a flare for combustion, and the flow rate is about 757Nm3H (the flow reaches 2000Nm when the temperature is high in summer3About/h, the highest ammonia content is 66%), the ammonia content is 10.2%, 71Nm exists3Ammonia loss per hour. Ammonia is a key material in the production process of the fertilizer, is a product and a raw material, and a large amount of ammonia flows away, so that the consumption of enterprises is increased, economic loss is caused, and environmental pollution is caused.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a recycling device for purge gas of a refrigeration system for synthetic ammonia, so as to solve the problems in the prior art.
In order to achieve the above purpose, the technical scheme of the utility model is that:
the utility model provides a synthetic ammonia refrigerating system relaxs gassing recycle device, relaxs gassing recovery pipeline, desalting water pipeline, aqueous ammonia recovery pipeline and inert gas discharge tube including washing ammonia tower, synthetic ammonia, the synthetic ammonia relaxs the one end of gassing recovery pipeline and is connected with the cold ware of the self-assembling formula ammonia among the synthetic ammonia refrigerating system, the other end with wash the first access connection that the ammonia tower is located the middle part, desalting water pipeline with wash the second access connection that the ammonia tower is located the top, inert gas discharge tube with wash the gas discharge mouth that the ammonia tower is located the top and connect, aqueous ammonia recovery pipeline's one end with wash the liquid discharge mouth that the ammonia tower is located the bottom and connect, the other end is connected to the synthesis that urea synthesis system is used for urea.
Preferably, still install the aqueous ammonia cooler on the aqueous ammonia recovery pipeline, be provided with circulating water pipeline on the aqueous ammonia cooler.
Preferably, the ammonia scrubber further comprises a condensate conveying pipeline, wherein the condensate conveying pipeline is connected with a third inlet of the ammonia scrubber and is used for inputting condensate to carry out primary scrubbing on the purge gas entering the ammonia scrubber, and the third inlet is located between the first inlet and the second inlet.
Preferably, the synthetic ammonia purge gas recovery pipeline, the desalted water pipeline, the ammonia water recovery pipeline, the inert gas discharge pipeline and the condensate conveying pipeline are all provided with flow regulating valve banks.
Preferably, the bottom of the ammonia washing tower is also provided with a tower bottom heat tracing piece.
Preferably, the ammonia washing tower is also provided with a liquid level control valve.
The utility model has the advantages that: the utility model provides a synthetic ammonia refrigerating system relaxs gassing recycle device, relaxs to deflate and come from combination formula ammonia cooler in the synthetic ammonia refrigerating system, and system itself has pressure, utilizes the operating pressure of gas itself to accomplish the inflation, so need not pressurize again, can directly get into and wash ammonia tower middle part, and desalinized water gets into from the top through the second import, and through the convection current contact with the speed of the gas of passing through the second import entering, dissolves ammonia wherein, and non-condensable gas continues to rise, is sent to torch burning evacuation etc. through the upper portion silk screen through inert gas discharge tube; the method has the advantages that a large amount of intermediate product ammonia which is high in content in the purge gas and is used as the raw material for synthesizing the urea can be recovered, the production cost is reduced, the problem of ammonia waste in the production process of the coal-based synthetic ammonia is solved, the technical level is simple and advanced, the operability is strong, and the method has good popularization and application prospects; and the desalted water is used for washing and recovering, so that the introduction of impurity ions is reduced, and the normal operation of the system is ensured.
Drawings
Fig. 1 is a schematic structural view of the present invention;
description of reference numerals:
1. an ammonia washing tower; 2. a synthetic ammonia purge gas recovery pipeline; 3. a desalted water line; 4. an ammonia water recovery pipeline; 5. an inert gas discharge line; 6. a self-assembled ammonia cooler; 7. a urea synthesis system; 8. an ammonia water cooler; 9. a circulating water pipeline; 10. a condensate delivery conduit; 11. a flow regulating valve group; 12. a tower bottom heat tracing piece; 13. a liquid level control valve; 14. heating the pipeline; 15. a source of condensate; 16. a source of desalinated water.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic concept of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.
Example (b):
referring to fig. 1, the device for recycling purge gas of a synthetic ammonia refrigeration system comprises an ammonia washing tower 1, a synthetic ammonia purge gas recycling pipeline 2, a desalted water pipeline 3, an ammonia water recycling pipeline 4 and an inert gas discharge pipeline 5, wherein one end of the synthetic ammonia purge gas recycling pipeline 2 is connected with a self-combined ammonia cooler 6 in the synthetic ammonia refrigeration system, and the other end of the synthetic ammonia purge gas recycling pipeline is connected with a first inlet positioned in the middle of the ammonia washing tower 1; one end of the desalting water pipeline 3 is connected with a second inlet positioned at the top of the ammonia washing tower 1, and the other end of the desalting water pipeline is connected with a desalting water source 16; the inert gas discharge pipeline 5 with wash the gas vent that ammonia tower 1 is located the top and be connected, the one end of aqueous ammonia recovery pipeline 4 with wash the liquid vent that ammonia tower 1 is located the bottom and be connected, the other end is connected to urea synthesis system 7 and is used for the synthesis of urea.
In the embodiment, the pressure of the self-combined ammonia cooler in the cooling system for synthesizing ammonia by the purge gas is generally 1.5MPa, the temperature is 30 ℃, and the flow rate is 850-2800 Nm3(ii) a The pressure of desalted water in the desalted water pipe 3 is generally 0.8MPa, the temperature is 25 ℃, and the flow rate is 2m3H; the expansion is finished by utilizing the working pressure of the gas, so the gas does not need to be pressurized, the desalted water can directly enter the middle part of the ammonia washing tower from the top through the second inlet, is in convective contact with the purge gas entering through the second inlet, dissolves ammonia in the purge gas, continuously rises the non-condensable gas, and is sent to a torch for combustion and emptying and the like through an upper wire mesh and an inert gas discharge pipeline 5; the purge gas (mostly inert gas) after washing in the ammonia scrubber in the inert gas discharge line 5 is generally at a pressure of 0.59MPa, a temperature of 40 ℃ and a flow rate of 650Nm3(ii) a In the embodiment, a large amount of intermediate product ammonia which is high in content in the purge gas and is used as the raw material for synthesizing the urea can be recovered, the production cost is reduced, the problem of ammonia waste in the production process of the synthetic ammonia prepared from coal is solved, the technical level is simple and advanced, the operability is strong, and the method has good popularization and application prospects(ii) a And the desalted water is used for washing and recovering, so that the introduction of impurity ions is reduced, and the normal operation of the system is ensured.
In this embodiment, still install ammonia water cooler 8 on ammonia water recovery pipeline 4, be provided with circulating water pipeline 9 on the ammonia water cooler 8, because the desalinized water can release heat when absorbing the ammonia in the purge gas, lead to washing the desalinized water of ammonia tower bottom, the ammonia water temperature risees, can reach 50 ~ 90 ℃, consequently further condenses through setting up ammonia water cooler 8 at washing ammonia tower rear end and washing exhaust aqueous ammonia, desalinized water etc. in the ammonia tower 1 to reduce the temperature rising problem that leads to because of the ammonia absorption process is exothermic.
In this embodiment, the system further comprises a condensate conveying pipeline 10, wherein one end of the condensate conveying pipeline 10 is connected with a third inlet of the ammonia washing tower 1, the other end of the condensate conveying pipeline is connected with a condensate source 15, the condensate source is used for inputting condensate to preliminarily wash the purge gas entering the ammonia washing tower 1, and the third inlet is located between the first inlet and the second inlet; the condensate can be dilute ammonia solution, comes from a urea synthesis system, and has the pressure of 0.75MPa, the temperature of 45 ℃ and the flow of 3-5 m3H; through setting up condensate conveying pipeline 10, carry out preliminary washing to the purge gas with weak ammonia aqueous solution, can reduce the quantity of demineralized water to reduce treatment cost.
In this embodiment, the synthetic ammonia purge gas recovery pipeline 2, the desalted water pipeline 3, the ammonia water recovery pipeline 4, the inert gas discharge pipeline 5, and the condensate conveying pipeline 10 are all provided with flow regulating valve sets 11 for regulating the flow pressure of the corresponding pipelines.
In this embodiment, the bottom of the ammonia washing tower 1 is further provided with a tower bottom heat tracing piece 12, the tower bottom heat tracing piece 12 is provided with a heating pipeline 14, the heating pipeline 14 can be used for conveying low-pressure steam, the pressure of the low-pressure steam can be set to 0.6MPa, and the temperature is 160 ℃; and then the bottom of the ammonia washing tower 1 is properly heated by the tower bottom heat tracing piece 12, which is mainly used for achieving the anti-freezing effect when the temperature is lower in winter.
In this embodiment, a liquid level control valve 13 is further installed on the ammonia scrubber 1 to control and regulate the liquid level of the ammonia water at the bottom of the ammonia scrubber.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (6)
1. The device for recycling the purge gas of the synthetic ammonia refrigeration system is characterized by comprising an ammonia washing tower (1), a synthetic ammonia purge gas recycling pipeline (2), a desalted water pipeline (3), an ammonia water recycling pipeline (4) and an inert gas discharge pipeline (5), one end of the synthetic ammonia purge gas recovery pipeline (2) is connected with a self-combined ammonia cooler (6) in the synthetic ammonia refrigeration system, the other end is connected with a first inlet positioned in the middle of the ammonia washing tower (1), the desalting water pipeline (3) is connected with a second inlet positioned at the top of the ammonia washing tower (1), the inert gas discharge pipeline (5) is connected with a gas discharge port positioned at the top of the ammonia washing tower (1), one end of the ammonia water recovery pipeline (4) is connected with a liquid discharge port at the bottom of the ammonia washing tower (1), and the other end of the ammonia water recovery pipeline is connected to a urea synthesis system (7) for synthesizing urea.
2. The recycling device of the purge gas of the synthetic ammonia refrigeration system according to claim 1, wherein the ammonia water recycling pipeline (4) is further provided with an ammonia water cooler (8), and the ammonia water cooler (8) is provided with a circulating water pipeline (9).
3. The synthesis ammonia refrigeration system purge gas recycling device according to claim 1, further comprising a condensate delivery pipe (10), wherein the condensate delivery pipe (10) is connected to a third inlet of the ammonia scrubber (1) for inputting condensate to perform preliminary scrubbing on the purge gas entering the ammonia scrubber (1), and the third inlet is located between the first inlet and the second inlet.
4. The synthesis ammonia refrigeration system purge gas recycling device according to claim 3, wherein the synthesis ammonia purge gas recycling pipeline (2), the desalted water pipeline (3), the ammonia water recycling pipeline (4), the inert gas discharge pipeline (5) and the condensate conveying pipeline (10) are all provided with a flow regulating valve set (11).
5. The synthesis ammonia refrigeration system purge gas recycling device according to claim 1, characterized in that the bottom of the ammonia scrubber (1) is further provided with a tower bottom heat tracing piece (12).
6. The synthesis ammonia refrigeration system purge gas recycling device according to claim 1, characterized in that the ammonia scrubber (1) is further provided with a liquid level control valve (13).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120489099.1U CN215048696U (en) | 2021-03-08 | 2021-03-08 | Synthetic ammonia refrigerating system purge gas recycling device |
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| CN202120489099.1U CN215048696U (en) | 2021-03-08 | 2021-03-08 | Synthetic ammonia refrigerating system purge gas recycling device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116625026A (en) * | 2023-07-25 | 2023-08-22 | 浙江科维节能技术股份有限公司 | Energy-saving ammonia refrigerating system for ammonia synthesis device and energy-saving method thereof |
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2021
- 2021-03-08 CN CN202120489099.1U patent/CN215048696U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116625026A (en) * | 2023-07-25 | 2023-08-22 | 浙江科维节能技术股份有限公司 | Energy-saving ammonia refrigerating system for ammonia synthesis device and energy-saving method thereof |
| CN116625026B (en) * | 2023-07-25 | 2023-10-13 | 浙江科维节能技术股份有限公司 | Energy-saving ammonia refrigerating system for ammonia synthesis device and energy-saving method thereof |
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