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Method for circularly utilizing cooling capacity and method for increasing yield of synthesis ammonia

A technology for synthesizing ammonia and cooling capacity, which is applied in the preparation/separation of ammonia, etc. It can solve the problems affecting the production of ammonia and the air pumping volume of the compressor, and achieve the effects of reducing impurities, increasing the operating cycle, and increasing the air pumping volume

Inactive Publication Date: 2014-04-02
BEIJING LIDAHUAFENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Before the decompression of semi-water gas, the winter temperature is 24-26°C, and the summer temperature is 36-40°C. The high temperature of semi-water gas in summer affects the pumping volume of the compressor, thereby affecting the ammonia production.

Method used

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  • Method for circularly utilizing cooling capacity and method for increasing yield of synthesis ammonia

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Experimental program
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Effect test

Embodiment 1

[0026] Such as figure 1 As shown, by adding a cooling tower spray tower at the inlet of the first-stage compressor of synthetic ammonia (that is, before the first stage of compression), the spray nozzle adopts Φ50 volute-type atomizing nozzles, 48 ​​nozzles, and is installed at the inlet of the chilled water pump Install an 80-mesh (70-90 mesh) filter (not shown in the figure), set the outlet pressure of the chilled water pump to 0.45MPa, and the 40°C semi-water gas from the energy section flows into the first-stage compressor before entering the cooling tower for spraying tower; the chilled water at 15°C in the ionic membrane caustic soda section is pumped to the top of the cooling tower spray tower to exchange heat with the semi-water gas through the chilled water pump, and the temperature of the semi-water gas drops below 33°C, and then enters the first-stage compressor for ammonia synthesis, and then Ammonia is synthesized according to the conventional ammonia synthesis pr...

Embodiment 2

[0028] Such as figure 1 As shown, by adding a cooling tower spray tower at the inlet of the first-stage compressor of synthetic ammonia (that is, before the first stage of compression), the spray nozzle adopts Φ50 volute-type atomizing nozzles, 45 nozzles, at the inlet of the chilled water pump Install a 90-mesh filter screen, set the outlet pressure of the chilled water pump to 0.35MPa, and enter the cooling tower spray tower before the 36°C semi-water gas from the energy section flows into the first-stage compressor (that is, the first stage of compression); the ionic membrane caustic soda section 20 The chilled water at about ℃ is pumped to the top of the cooling tower spray tower to exchange heat with the semi-water gas, the temperature of the semi-water gas drops below 31 °C, and then enters the first-stage compressor of synthetic ammonia; the bottom of the cooling tower spray tower comes out The chilled water is pumped through the water recovery pump to the ammonia coole...

Embodiment 3

[0030] Such as figure 1 As shown, by adding a cooling tower spray tower at the inlet of the first-stage compressor of synthetic ammonia, the spray nozzle adopts Φ50 volute type atomizing nozzle, 50 nozzles, and installs 70 mesh (70- 90 mesh) filter screen, the outlet pressure of the chilled water pump is set to 0.40MPa, and the 38°C semi-water gas from the energy section enters the cooling tower spray tower before entering the first-stage compressor (that is, the compression section); the ionic membrane caustic soda section The chilled water at about 12°C is pumped to the top of the cooling tower spray tower to exchange heat with the semi-water gas, the temperature of the semi-water gas drops below 30°C, and then enters the first-stage compressor of synthetic ammonia; the bottom of the cooling tower spray tower The chilled water that comes out is pumped through the water recovery pump to the ammonia cooler to cool down to 11°C, and is used for cooling the chlorine gas. The tem...

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Abstract

The invention relates to a method for circularly utilizing cooling capacity and a method for increasing yield of synthesis ammonia. The method for circularly utilizing the cooling capacity and the method for increasing the yield of the synthesis ammonia are characterized in that: in a method of synthesizing ammonia, semi-water gas at a temperature less than or equal to 40 DEG C from an energy section enters a spray tower of a cooling tower before entering into a compressor compressed with one section; chilled water at a temperature of 10-20 DEG C from an ion film caustic soda section is pumped to the top of the spray tower of the cooling tower through a chilled water pump and exchanges heat with the semi-water gas to ensure that the semi-water gas is cooled down to below 33 DEG C and then enters into the compressor compressed by one section; the chilled water coming out of the bottom of the spray tower of the cooling tower is pumped to an ammonia cooler through a water recovery pump and cooled to be 10-15 DEG C for chlorine cooling use at the ion film caustic soda section; therefore, the yield of the synthesis ammonia is increased while the cyclic utilization of the cooling capacity is realized.

Description

technical field [0001] The invention relates to a method for reducing energy consumption by recycling cooling capacity, in particular to a method for reducing the temperature of semi-water gas by using frozen water in an ion-exchange membrane caustic soda process. Background technique [0002] Ammonia is one of the important inorganic chemical products. The method of industrial ammonia synthesis is usually to compress the mixture of hydrogen and nitrogen to high pressure and synthesize ammonia under the action of a catalyst. The ammonia synthesis reaction formula is as follows: N 2 +3H 2 →2NH 3 . The process of ammonia synthesis usually includes: raw material gas preparation process, making coal and natural gas and other raw materials into crude raw material gas containing hydrogen and nitrogen, such as semi-water gas; crude raw material gas purification treatment process, removing impurities other than hydrogen and nitrogen, mainly including transformation Process, desul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/04
Inventor 蒋远华杨晓勤张继东龙传光孙哲
Owner BEIJING LIDAHUAFENG TECH