Cooling device for high-temperature ammonia-containing gas sampling system

A ammonia-containing gas and sampling system technology, applied in the field of power plant chemical industry, can solve the problems of inability to obtain the gas phase at the outlet of the hydrolyzer in the shortest time, the slow cooling rate of the required gas, and the low utilization rate of the cooling medium, etc., to achieve random assembly and coordination , simple structure, and the effect of improving efficiency

Inactive Publication Date: 2015-06-03
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, cooling devices mostly use cooling media (such as tap water) for heat exchange, and it is more common to directly feed water into the water inlet of the cooling pipe. After heat exchange, the low-temperature water carrying heat directly flows from the cooling pipe The water outlet is discharged, the cost is high, and the cooling rate of the required gas is slow, the utilization rate of the cooling medium is low, and the chemical composition of the gas phase at the outlet of the hydrolyzer cannot be obtained in the shortest time, and the efficiency is low

Method used

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  • Cooling device for high-temperature ammonia-containing gas sampling system
  • Cooling device for high-temperature ammonia-containing gas sampling system
  • Cooling device for high-temperature ammonia-containing gas sampling system

Examples

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example 1

[0033] A cooling device for a high-temperature ammonia-containing gas sampling system of the present invention, such as figure 1 As shown, it includes a sampling pipeline 2 connected to the main pipeline 1 of the gas phase outlet of the reactor, and a precooler 5 and a sampling cooler 8 sequentially connected to the sampling pipeline; the sampling pipeline 2 is sequentially provided with a high temperature and high pressure valve group 3 and A high temperature and high pressure blowdown valve 4; a pressure reducing valve 9, a sampling valve 10 and a sampling container 11 are sequentially arranged on the pipeline connected to the sample gas outlet 15 of the cooler; figure 2 As shown, the sampling cooler group in this preferred embodiment is composed of a sampling cooler 8, which is suitable for the situation where the concentration of ammonia gas in the gas sample is low or the moisture content in the components is relatively small. A sample cooler 8 is provided with a precooler...

example 2

[0035] A cooling device for a high-temperature ammonia-containing gas sampling system of the present invention, such as image 3 As shown, on the basis of Example 1, a group of cooling devices is added in the sampling cooler group connected to the sampling pipeline 2 on the main gas phase pipeline 1 of the reactor outlet, and is arranged behind the high temperature and high pressure sampling valve group, divided into two ways Enter the two pre-coolers 5 respectively, and then enter the respective sampling coolers 8 respectively. The sample gas from the respective sampling coolers 8 enters the pipeline in front of the pressure reducing valve 9 for follow-up sampling work after being processed by heat exchange and cooling. From the outside of the unit, they enter the water inlets 6 of the two sets of sampling coolers 8 through ball valve control respectively. After heat exchange, the cooling medium is discharged from the respective sampling coolers. It is reused, and then discha...

example 3

[0037] A cooling device for a high-temperature ammonia-containing gas sampling system of the present invention, such as Figure 4 As shown, for the case where the concentration of ammonia gas in the gas sample is high or the water content in the components is relatively high, due to the difference in the concentration of the urea aqueous solution, the proportions of ammonia, water, and carbon dioxide contained in the gas phase are also different. If the component content of ammonia and carbon dioxide is not affected at the same time, only neutral desiccants can be used, but most commonly used neutral desiccants cannot be used because they react with product gas to form other products. In order to better test the ammonia content in the product gas, two special filler coolers can be set up to conduct the treatment test twice. The sample gas sampled for the first time only passes through the sampling cooler filled with carbon dioxide solid absorbent 16, Dry moisture and carbon di...

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Abstract

The invention discloses a cooling device for a high-temperature ammonia-containing gas sampling system. The cooling device comprises a sampling pipeline, a precooler and a sampling cooler group, wherein the sampling pipeline is connected to a gas phase outlet main pipeline of a reactor; the precooler and the sampling cooler group are sequentially connected to the sampling pipeline; the sampling cooler group comprises at least one sampling cooler; each sampling cooler is provided with a cooler sample gas inlet connected with a precooler sample outlet, a cooler sample gas outlet connected with the sampling container, and a cooling medium inlet and a cooling medium outlet which are used for circulation of the cooling media; and the cooling medium outlet is connected with a cooled material inlet of the precooler. According to the precooler, the cooling media discharged from the cooler group are subjected to secondary utilization, the sampling gas is precooled and treated, the discharged cooling media are fully utilized for exchanging, the heat energy is well enriched, subsequent utilization is promoted, and the condition of the enriched energy is improved; and moreover, one sampling pipeline can correspond to multiple sampling coolers, one cooler corresponds to one precooler, and the cooling operation is timely and effective.

Description

technical field [0001] The invention belongs to the technical field of power plant chemical industry, and relates to a cooling device in a gas phase outlet sampling system of a urea hydrolyzer in a flue gas denitrification system, in particular to a cooling device for a high-temperature ammonia-containing gas sampling system. Background technique [0002] The denitrification reducing agent ammonia (NH 3 ) In the early days, liquid ammonia was mainly prepared, but the risks of liquid ammonia in transportation and storage were relatively high. Due to its high safety, urea ammonia production technology has attracted more and more attention from SCR denitrification users, and has a very broad market application prospect. [0003] Utilize the hydrolysis reaction of urea to produce ammonia, the ammonia content in the gas phase at the outlet of the hydrolysis reactor is relatively high, usually 50wt% aqueous urea solution is fed, and the gas phase at the outlet of the hydrolyzer c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/00C01C1/08G01N1/42G01N1/22
Inventor 向小凤张波张向宇徐宏杰
Owner HUANENG POWER INT INC
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