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A gas phase separation sampling system and sampling method for a urea hydrolysis reactor

A urea hydrolysis and gas phase separation technology, applied in the field of flue gas denitrification, can solve the problems of damage to the internal components of the analysis instrument, unreliable test results, unstable analysis results fluctuations, etc. 、Analyze the accurate and real effect of the test structure

Inactive Publication Date: 2017-01-11
HUANENG POWER INTERNATIONAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to obtain the output gas phase samples for further laboratory analysis under the working conditions of high temperature, high pressure and special media. , not only when the water is seriously evaporated, some product components will be carried away, causing the sample to lose its authenticity, and the splashing of vapor and liquid will cause the safety problem of hurting people.
[0005] In the prior art, the gas-phase composition analysis of the urea hydrolysis reactor is often carried out through online instruments (such as chromatographic analyzers), but the moisture under high temperature conditions is extremely unfavorable to the analysis instruments, resulting in unstable fluctuations in analysis results, and even damage Analyze the internal components of the instrument, resulting in unreliable test results; and the liquid phase test will also fluctuate due to the influence of high temperature and high pressure, and ultimately cannot quickly and accurately determine the required measurement parameters

Method used

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  • A gas phase separation sampling system and sampling method for a urea hydrolysis reactor
  • A gas phase separation sampling system and sampling method for a urea hydrolysis reactor
  • A gas phase separation sampling system and sampling method for a urea hydrolysis reactor

Examples

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Effect test

example 1

[0032] The gas phase separation sampling system of a kind of urea hydrolysis reactor of the present invention, as figure 1 As shown, it includes a sampling pipeline 6 connected to the gas phase outlet 3 of the urea hydrolysis reactor 2, and a cooler group and a buffer bottle 13 connected to the gas outlet of the sampling pipeline 6 in turn; the sampling pipeline 6 is sequentially provided with sampling manual Valve 7 and sampling solenoid valve 8; buffer bottle gas phase outlet 14 of buffer bottle 13 connects gas phase analyzer 16 through gas phase sample valve 15, buffer bottle liquid phase outlet 17 connects liquid phase sampler 19 through liquid phase sample valve 18. In this preferred embodiment, the cooler group includes two stages of coolers arranged in series, namely a primary cooler 9 and a secondary cooler 10 . like figure 1 As shown, the primary cooler 9 and the secondary cooler 10 adopt immersion coolers. Under the condition of normal operation of the equipment, th...

example 2

[0038] like figure 2 As shown, on the basis of Example 1, the gas phase separation sampling system also includes a sampling pipeline 6 and a cooler group that are sequentially connected to the liquid phase outlet 1 of the urea hydrolysis reactor 2, and the outlet of the cooler group passes through a liquid phase sample valve 18 Connect the corresponding liquid phase sampler 19. It can analyze the ammonia content in the liquid phase, and can verify and cooperate with the analysis results of the gas phase to ensure the efficiency of sampling and the accuracy of subsequent analysis.

example 3

[0040] like image 3 As shown, on the basis of example 2, the outlet of the cooler group of the liquid phase outlet 1 one way of the urea hydrolysis reactor 2 is connected with the same buffer bottle 13 as the gas phase outlet 3 one way; the buffer bottle gas phase outlet 14 of the buffer bottle 13 Connect the gas phase analyzer 16 by the gas phase sample valve 15, the buffer bottle liquid phase outlet 17 is connected the liquid phase sampler 19 by the liquid phase sample valve 18; Thereby be provided with the same sampling as the gas phase outlet 3 at urea hydrolysis reactor 2 liquid phase outlet 1 Pipeline 6, cooler group and buffer bottle 13, when the separation and sampling of the gas phase outlet 3 fails; the liquid phase outlet 1 and the gas phase outlet 3 are connected interchangeably, and the vapor phase separation and sampling can be continued. Improve the overall reliability and stability of the system.

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PUM

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Abstract

The invention discloses a gas phase separation sampling system of a urea hydrolysis reactor. The system comprises a sampling pipe connected with a gas phase outlet of the urea hydrolysis reactor, and a cooler set and a buffer bottle orderly connected with the gas outlet end of the sampling pipe; a hand-operated sampling valve and a sampling electromagnetic valve are orderly arranged on the sampling pipe; a buffer bottle gas phase outlet of the buffer bottle is connected with a gas phase analyzer through a gas phase sample valve, and a liquid phase outlet of the buffer bottle is connected with a liquid phase sampler through a liquid phase sample valve. The gas phase separation sampling method of the gas phase separation sampling system of the urea hydrolysis reactor comprises the following steps: (1) evacuating impurities and air in the sampling pipe; (2) cooling a sampled gas phase by enabling the gas phase to orderly pass through coolers in the cooler set, and then feeding the cooled gas phase into the buffer bottle for performing gas phase and liquid phase separation; and (3) switching on the gas phase sample valve, introducing the gas phase in the gas phase analyzer, switching on the liquid phase sample valve, and introducing a liquid phase in the liquid phase sampler for finishing the gas phase separation sampling.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification, and relates to gas-liquid sampling of a urea hydrolysis ammonia production reactor in a flue gas denitrification system, in particular to a gas phase separation sampling system and a sampling method of a urea hydrolysis reactor. Background technique [0002] Selective catalytic reduction (SCR) in coal-fired power plants removes NOx from flue gas and converts it into non-toxic and harmless nitrogen (N 2 ) and water (H 2 O), to meet the emission requirements. Among them, the denitration reducing agent ammonia (NH 3 ) can be obtained by urea hydrolysis. [0003] Urea is a white crystalline particle, which does not belong to the category of hazardous chemicals. It is convenient for storage and transportation. The ammonia production method using urea hydrolysis will not cause safety hazards due to leakage. From the perspective of safety and economy, urea ammonia production is gradu...

Claims

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Application Information

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IPC IPC(8): G01N1/20G01N1/22
Inventor 向小凤张波张向宇徐宏杰
Owner HUANENG POWER INTERNATIONAL