Recovery system and process for waste heat in production of anhydrous ammonia from ammonium phosphate through ammonia washing

A technology of ammonia washing with ammonium phosphate and waste heat recovery, which is applied in the fields of ammonia preparation/separation, chemical industry, sustainable manufacturing/processing, etc., can solve the problems of high cost and high energy consumption, and achieve the effect of simple structure and scientific process

Inactive Publication Date: 2016-02-03
薛斌
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to propose a waste heat recovery system for the production of anhydrous ammonia by ammonium phosphate washing, which effectively integrates the factory itself The low-grade waste heat is

Method used

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  • Recovery system and process for waste heat in production of anhydrous ammonia from ammonium phosphate through ammonia washing

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Embodiment 1

[0031] Take the waste heat recovery system of coking plant gas using ammonium phosphate to wash ammonia to produce anhydrous ammonia and the distillation process of residual ammonia as an example, and combine figure 1 The waste heat recovery process of washing ammonia with ammonium phosphate to produce anhydrous ammonia in this embodiment will be described.

[0032] Ammonia 7g / m from upstream process 3 The coke oven gas (ammonia-containing gas) enters the lower part of the ammonia absorption tower 1, and in the ammonia absorption tower 1, carries out countercurrent contact with the circulating ammonium phosphate rich liquid sprayed in the middle part and the ammonium phosphate lean liquid sprayed in the upper part. The ammonia content of the washed gas (gas after deammonization) is 100mg / m 3 Thereafter, it exits from the top of the ammonia absorption tower 1 to the downstream process. The ammonium phosphate rich liquid at the bottom of the ammonia absorption tower 1 is extra...

Embodiment 2

[0043] Take the coking plant acid mixed gas using ammonium phosphate to wash ammonia to produce anhydrous ammonia waste heat recovery system and potassium carbonate rich liquid distillation process as an example, and combine figure 1 The waste heat recovery process of washing ammonia with ammonium phosphate to produce anhydrous ammonia in this embodiment will be described.

[0044] The ammonia content from the deacidification and ammonia distillation process is 28g / m 3 The acid mixed gas (ammonia-containing gas) enters the lower part of the ammonia absorption tower 1, and in the ammonia absorption tower 1, carries out countercurrent contact with the circulating ammonium phosphate rich liquid sprayed in the middle part and the ammonium phosphate lean liquid sprayed in the upper part. The ammonia content of acid vapor (gas after deammonization) after washing is 2-4g / m 3 , leave from the top of the ammonia absorption tower 1 to go to the downstream process. The ammonium phospha...

Embodiment 3

[0054] Taking the waste heat recovery system of coking plant gas using ammonium phosphate to wash ammonia to produce anhydrous ammonia and the deacidification lean liquid distillation process as an example, combined with figure 1 The waste heat recovery process of washing ammonia with ammonium phosphate to produce anhydrous ammonia in this embodiment will be described.

[0055] Ammonia 9g / m from upstream process 3 The coke oven gas (ammonia-containing gas) enters the lower part of the ammonia absorption tower 1, and in the ammonia absorption tower 1, carries out countercurrent contact with the circulating ammonium phosphate rich liquid sprayed in the middle part and the ammonium phosphate lean liquid sprayed in the upper part. The ammonia content of the washed gas (gas after deammonization) is 100mg / m 3 Thereafter, it exits from the top of the ammonia absorption tower 1 to the downstream process. The ammonium phosphate rich liquid at the bottom of the ammonia absorption towe...

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Abstract

The invention provides a recovery system and process for waste heat in production of anhydrous ammonia from ammonium phosphate through ammonia washing. The waste heat recovery process comprises the following steps: allowing high-temperature hot water from a first desorption tower cooler and/or first ammonium phosphate lean solution cooler to enter a distillation column heater, heating and vaporizing a lean solution from the bottom of a distillation column and allowing steam produced by the lean solution to enter the distillation column; cooling the high-temperature hot water while the high-temperature hot water heats the lean solution, pumping the cooled hot water to the first desorption tower cooler and/or first ammonium phosphate lean solution cooler via a hot water pump and heating the cooled hot water with ammonia steam and/or ammonium phosphate lean solution so as to obtain high-temperature hot water; and pumping a circulation lean solution at the bottom of the distillation column to the first desorption tower cooler and/or first ammonium phosphate lean solution cooler via a circulation lean solution pump, heating the circulation lean solution with ammonia steam and/or ammonium phosphate lean solution, then returning the heated circulation lean solution to the bottom of the distillation column and carrying out flash evaporation so as to produce rising steam needed in rich solution distillation. The process realizes recycling of low-grade waste heat and has the characteristics of low energy consumption and low operation cost.

Description

technical field [0001] The invention relates to waste heat recovery technology, in particular to a waste heat recovery system and process for producing anhydrous ammonia by washing ammonia with ammonium phosphate. Background technique [0002] During the carbonization process of coking coal in the coke oven, most of the elemental nitrogen in the coal combines with hydrogen to form ammonia, which escapes from the coking chamber of the coke oven with the gas. The recovery of ammonia from coal gas and the production of anhydrous ammonia products have a dual significance. First of all, from the point of view of gas purification, the ammonia in the gas must be removed to prevent severe corrosion of equipment caused by corrosive media with ammonia as the medium; secondly, ammonia is an important chemical basic raw material and has a wide range of civil and industrial applications. use. [0003] The process of ammonium phosphate washing ammonia to produce anhydrous ammonia is to ...

Claims

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Application Information

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IPC IPC(8): C01C1/02
CPCY02P20/10Y02P20/129Y02P20/50
Inventor 薛斌
Owner 薛斌
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