CN104261428A

CN104261428A - Synthesis ammonia production method for improving net value of ammonia

Info

Publication number: CN104261428A
Application number: CN201410451463.XA
Authority: CN
Inventors: 袁俊迎; 冯尚武; 杨少忠; 岳万华
Original assignee: SHANDONG SHUNTIAN CHEMICAL GROUP CO Ltd
Current assignee: SHANDONG SHUNTIAN CHEMICAL GROUP CO Ltd
Priority date: 2014-09-08
Filing date: 2014-09-08
Publication date: 2015-01-07

Abstract

The invention discloses a synthesis ammonia production method for improving a net value of ammonia. According to the method, a circulating gas after liquid nitrogen is separated by a cool exchanger is firstly in counter-current contact with high-pressure soft water sprayed from the top at the bottom of a high-efficiency ammonia purification tower before entering a circulating compressor; residual 2.5%-3.5% of ammonia gas after the liquid nitrogen is separated from the cool exchanger is absorbed by the soft water to generate high-purity excellent ammonium hydroxide to an ammonium hydroxide storage tank; the ammonium content of the circulating gas is about 0.1%-0.15%; and the circulating gas enters a high-efficiency water separator to separate entrained water mist from the top of the high-efficiency ammonia purification tower, and then enters the circulating compressor. Due to the technique, the content of the ammonia gas in the circulating gas is lowered, energy and power consumption in the production process can be reduced, and the comprehensive productive capacity is improved.

Description

A kind of synthesis ammonia production method improving ammonia net value

Technical field

The invention belongs to Ammonia Production technical field, be specifically related to a kind of synthesis ammonia production method improving ammonia net value.

Background technology

The ammonia synthesis production technology that current industry generally adopts is that gas is delivered to oil separator by recycle compressor, the effect lower part nitrogen of synthetic tower at ammonia synthesis catalyst is delivered to after separating greasy dirt, hydrogen synthesizes ammonia, in outlet circulation gas, ammonia content is generally about 13%, then through waste heat recoverer, heat is handed over, water cooler is sent to cool after water heater recovery waste heat, ammonia condenser is sent to lower the temperature further again after sending ammonia separator to separate part liquefied ammonia after cooling, then send cool exchanger to be separated liquefied ammonia and after reclaiming cold, return recycle compressor and carry out next one circulation, in circulation gas after separation liquefied ammonia, ammonia content is generally at 2.5-3.5%, in the middle of a circulation, the isolated synthetic ammonia of synthesis (i.e. ammonia net value) is only about 10%, the ammonia of 2.5-3.5% is had to circulate in synthesis system with circulation gas, this system cloud gray model both wasted electric energy, also influential system integrated production capacity.

Summary of the invention

The object of the invention is, for problems of the prior art, to be designed by Optimization Technology, reduce a nitrogen content in circulation gas, to reach the energy, the power consumption of reduction production process, provide the object of integrated production capacity.

The object of the invention is to be achieved through the following technical solutions, after alkane gas through except separating of oil laggard enter ammonia condenser and circulation gas be mixed and enter cool exchanger and be separated liquefied ammonia, then go recycle compressor that gas pressurization is delivered to oil separator, the effect lower part nitrogen of synthetic tower at ammonia synthesis catalyst is delivered to after separating greasy dirt, hydrogen synthesizes ammonia, then through waste heat recoverer, heat is handed over, water cooler is sent to cool after water heater recovery waste heat, ammonia condenser is sent to lower the temperature further again after sending ammonia separator to separate part liquefied ammonia after cooling, then send cool exchanger to be separated liquefied ammonia and after reclaiming cold, return recycle compressor and carry out next one circulation, the liquefied ammonia separated send liquid ammonia storage tank, before it is characterized in that the circulation gas after cool exchanger is separated liquefied ammonia enters recycle compressor, first go bottom efficient ammonia-cleaning tower with the high pressure soft water counter current contact of to get off from top spray, after cool exchanger is separated liquefied ammonia, the ammonia of remaining 2.5-3.5% is generated high purity high-quality ammoniacal liquor deammoniation water storage tank by soft water absorption, now circulation gas ammonia content is about 0.1-0.15%, circulation gas removes recycle compressor again after efficient ammonia-cleaning tower top goes High-efficient Water separator to separate the water smoke carried secretly.

Beneficial effect of the present invention: owing to adopting above-mentioned processing method, after cool exchanger is separated liquefied ammonia, the ammonia of remaining 2.5-3.5% is generated high purity high-quality ammoniacal liquor deammoniation water storage tank by soft water absorption, now circulation gas ammonia content is about 0.1-0.15%, ammonia synthesis system ammonia net value is increased to 13% by 10%, synthesis system throughput is made to improve 30%, make synthesis system pressure drop about 5.0MPa, save power consumption and the coal consumption of the compression of this system gas accordingly.

Accompanying drawing explanation

Embodiments of the invention are described in detail below in conjunction with accompanying drawing

Fig. 1 is process flow sheet of the present invention

Fig. 2 is the process flow sheet of prior art.

Embodiment

As shown in Figure 1, after alkane gas through except separating of oil laggard enter ammonia condenser and circulation gas be mixed and enter cool exchanger and be separated liquefied ammonia, then go bottom efficient ammonia-cleaning tower with the high pressure soft water counter current contact of to get off from top spray, after cool exchanger is separated liquefied ammonia, the ammonia of remaining 2.5-3.5% is generated high purity high-quality ammoniacal liquor deammoniation water storage tank (for the production of the AG of high-quality or the ammoniacal liquor of electronic-grade) by soft water absorption, now circulation gas ammonia content is about 0.1-0.15%, circulation gas goes High-efficient Water separator to separate from efficient ammonia-cleaning tower top to carry water smoke secretly to go recycle compressor that gas pressurization is delivered to oil separator, the effect lower part nitrogen of synthetic tower at ammonia synthesis catalyst is delivered to after separating greasy dirt, hydrogen synthesizes ammonia, then through waste heat recoverer, heat is handed over, water cooler is sent to cool after water heater recovery waste heat, ammonia condenser is sent to lower the temperature further after sending ammonia separator to separate part liquefied ammonia after cooling, then send cool exchanger to be separated liquefied ammonia together with gas after alkane and carry out the next one after reclaiming cold and circulate, the liquefied ammonia separated send liquid ammonia storage tank.

Claims

1. one kind is improved the synthesis ammonia production method of ammonia net value, technical process is: after alkane gas through except separating of oil laggard enter ammonia condenser and circulation gas be mixed and enter cool exchanger and be separated liquefied ammonia, then go recycle compressor that gas pressurization is delivered to oil separator, the effect lower part nitrogen of synthetic tower at ammonia synthesis catalyst is delivered to after separating greasy dirt, hydrogen synthesizes ammonia, then through waste heat recoverer, heat is handed over, water cooler is sent to cool after water heater recovery waste heat, ammonia condenser is sent to lower the temperature further again after sending ammonia separator to separate part liquefied ammonia after cooling, then send cool exchanger to be separated liquefied ammonia and after reclaiming cold, return recycle compressor and carry out next one circulation, the liquefied ammonia separated send liquid ammonia storage tank, before it is characterized in that the circulation gas after cool exchanger is separated liquefied ammonia enters recycle compressor, first go bottom efficient ammonia-cleaning tower with the high pressure soft water counter current contact of to get off from top spray, after cool exchanger is separated liquefied ammonia, the ammonia of remaining 2.5-3.5% is generated high purity high-quality ammoniacal liquor deammoniation water storage tank by soft water absorption, circulation gas removes recycle compressor again after efficient ammonia-cleaning tower top goes High-efficient Water separator to separate the water smoke carried secretly.

2. a kind of synthesis ammonia production method improving ammonia net value according to claim 1, after cool exchanger is separated liquefied ammonia, the ammonia of remaining 2.5-3.5% is generated high purity high-quality ammoniacal liquor deammoniation water storage tank by soft water absorption, it is characterized in that now circulation gas ammonia content is about 0.1-0.15%.