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Process and device for producing concentrated ammonia water by washing ammonia with ammonium phosphate with controllable concentration of product ammonia water

A technology for washing ammonia with ammonia water concentration and ammonium phosphate, which is applied in the field of gas deammonization process in the coking industry. It can solve the problems that the concentration of ammonia gas cannot be guaranteed and the concentration of ammonia water cannot meet the specified requirements, and the concentration of ammonia water in the product can be accurately controlled and adjusted. Flexible and convenient, stable product quality

Active Publication Date: 2016-06-08
ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

"In actual production, when the amount of steam at the bottom of the tower is increased in order to make the ammonia content in the poor ammonium phosphate liquid at the bottom of the desorption tower qualified, even if all the rich liquid passes through the splitter, the concentration of ammonia vapor after the splitter cannot be guaranteed to be qualified. So that the concentration of ammonia water in the product does not meet the specified requirements

Method used

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  • Process and device for producing concentrated ammonia water by washing ammonia with ammonium phosphate with controllable concentration of product ammonia water
  • Process and device for producing concentrated ammonia water by washing ammonia with ammonium phosphate with controllable concentration of product ammonia water

Examples

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Embodiment 1

[0030] Such as figure 1 , Is the process flow diagram of this embodiment. In the process of producing concentrated ammonia water by ammonium phosphate washing ammonia, the desorption tower heater 1, ammonium phosphate washing ammonia desorption tower 2, ammonia vapor separator and ammonia vapor condenser 5 are all conventional The settings are not repeated here. The ammonia vapor fractionator in this embodiment is a two-stage fractional fractionator 3 and 4 arranged in parallel, and the ammonia vapor escaping from the top of the first-stage fractionator 3 passes through the lower ammonia vapor inlet 19 of the second-stage fractionator 4 When entering, the condensate (reflux ammonia) of the second-stage condenser 4 merges with the condensate of the first-stage condenser 3 and enters the condensate inlet 10 at the upper part of the desorption tower 2. The ammonia vapor escaping from the top of the second-stage fractionator 4 enters the ammonia vapor inlet 21 of the condenser, and...

Embodiment 2

[0032] Such as figure 2 , Is a schematic diagram of the process flow of this embodiment. The ammonia vapor fractionator in this example is a two-stage fractionator 3 and 4 connected up and down. The ammonia vapor from the desorption tower 2 passes through the first stage fractionator 3. It reaches the ammonia vapor outlet 20 at the top of the connected second-stage fractionator 4, and then enters the ammonia vapor inlet 21 of the condenser. The condensate (reflux ammonia) flows out from the condensate outlet 11 at the lower part of the first-stage fractionator and enters the condensate inlet 10 at the upper part of the desorption tower 2. In the first-stage fractionator 3, the ammonium phosphate rich liquid flowing through is used for heat exchange with ammonia vapor. In the second-stage fractionator 4, the heat exchange process with ammonia vapor is realized by circulating water. Dividers 3 and 4 can take tube pass or shell pass. By adjusting the amount of circulating water ...

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Abstract

The invention relates to a technology for producing stronger ammonia water with controllable concentration by scrubbing ammonia through ammonium phosphate. The technology comprises the following steps that ammonia escaping from the top of a desorber is partly condensed through two stages of dephlegmators, then enters an ammonia condenser to be condensed into the stronger ammonia water with the concentration being 10 to 30 percent, and the concentration of the stronger ammonia water is controlled by adjusting the circulating water flow of the second stage of dephlegmator. The device for realizing the technology comprises a heater, the desorber, the first stage of dephlegmator, the second stage of dephlegmator and the condenser which are sequentially communicated with one another through pipelines. Compared with the prior art, the method has the beneficial effects that firstly, the amount of ammonia water condensed and flowing back to the top of the phosphate from the condenser is adjusted by adjusting the circulating water flow of the second stage of dephlegmator; secondly, the stronger ammonia water can be accurately controlled, and the technology is beneficial to stabilizing the product quality; thirdly, when the amount of steam at the bottom of the desorber is adjusted, the concentration of ammonia in rear of the dephlegmators is kept unchanged, so that all technical processes are more flexible and convenient to adjust, and the smooth performing of production is guaranteed.

Description

Technical field [0001] The present invention relates to a process for removing ammonia from coal gas in the coking industry, in particular to a process and device for producing concentrated ammonia by washing ammonia with ammonium phosphate with controllable product ammonia concentration. Background technique [0002] At present, the domestic coke oven gas ammonia removal and recovery processes mainly include sulfuric acid absorption of ammonia to produce ammonium sulfate, water washing ammonia to produce concentrated ammonia or ammonia decomposition, and ammonium phosphate washing to produce concentrated ammonia or anhydrous ammonia. Among them, the ammonia phosphate washing process to produce concentrated ammonia water uses ammonium phosphate solution as the absorbent, and the coal gas enters the desorption tower and contacts with the ammonium phosphate solution sprayed countercurrently to remove most of the ammonia in the coal gas. Before entering the desorption tower, the ric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/02C01C1/12
Inventor 张素利徐作锋霍素斌刘占光隋东宇冯寒凝赵国峰
Owner ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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