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
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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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