CN-224212442-U - Double-effect deamination and heat energy recovery system for ammoximation wastewater

CN224212442UCN 224212442 UCN224212442 UCN 224212442UCN-224212442-U

Abstract

A double-effect deamination and heat energy recovery system for ammoximation wastewater comprises a wastewater tank, a wastewater feed pump, a heat exchanger, an atmospheric tower, an atmospheric discharge pump, a pressurizing tower, a pressurizing discharge pump, a wastewater cooler, a condenser, an ammonia water cooler, an ammonia water tank, an ammonia water discharge pump, an alkane washing tower, a tail gas absorption tower and a reboiler, wherein the wastewater tank is sequentially communicated with the wastewater feed pump, the heat exchanger tube side, the atmospheric tower, the atmospheric discharge pump, the pressurizing tower, the pressurizing discharge pump, the heat exchanger shell side and the wastewater cooler through pipelines, the top of the atmospheric tower is sequentially communicated with the condenser, the ammonia water cooler, the ammonia water tank, the ammonia water discharge pump and the alkane washing tower through pipelines, the gas phase outlet of the condenser is sequentially communicated with the tail gas absorption tower through pipelines, the top of the pressurizing tower is sequentially communicated with the reboiler shell side, the ammonia water condensation tank, the ammonia water condensation discharge pump and the alkane washing tower through pipelines, and the reboiler tube side is communicated with the atmospheric tower. The utility model is used for solving the problems of high energy consumption, high ammonia nitrogen emission and heat energy waste existing in the prior cyclohexanone ammoximation wastewater treatment in caprolactam production.

Inventors

WEI TIANRONG
XU SIHONG
CHEN SHIJIE
WANG ZHENLIN
WANG HAIJUN
YU TENG

Assignees

湖北三宁化工股份有限公司

Dates

Publication Date: 20260508
Application Date: 20250430

Claims (7)

1. A double-effect deamination and heat energy recovery system for ammoximation wastewater is characterized by comprising a wastewater tank, a wastewater feeding pump, a heat exchanger, an atmospheric tower, an atmospheric discharging pump, a pressurizing tower, a pressurizing discharging pump, a wastewater cooler, a condenser, an ammonia water cooler, an ammonia water tank, an ammonia discharging pump, an alkane washing tower, a tail gas absorbing tower and a reboiler, wherein the wastewater tank is sequentially communicated with the wastewater feeding pump, the heat exchanger tube side, the atmospheric tower, the atmospheric discharging pump, the pressurizing tower, the pressurizing discharging pump, the heat exchanger shell side and the wastewater cooler through pipelines, the top of the atmospheric tower is sequentially communicated with the condenser, the ammonia water cooler, the ammonia water tank, the ammonia water discharging pump and the alkane washing tower through pipelines, a gas phase outlet of the condenser is sequentially communicated with the tail gas absorbing tower through pipelines, the top of the pressurizing tower is sequentially communicated with the reboiler shell side, the ammonia water condensing tank, the ammonia water condensing discharging pump and the alkane washing tower through pipelines, and the reboiler tube side is communicated with the atmospheric tower.
2. The double-effect deamination and heat recovery system of ammoximation wastewater of claim 1, wherein the top of the ammonia tank is communicated with a pipeline between the condenser and the atmospheric tower through a first water return pipe, and a first water delivery valve is arranged on the first water return pipe.
3. The double-effect deamination and heat recovery system of ammoximation wastewater according to claim 1, wherein the top of the ammonia water condensing tank is communicated with a pipeline between the reboiler and the pressurizing tower through a second water return pipe, and a second water delivery valve is arranged on the second water return pipe.
4. The double-effect deamination and heat energy recovery system of ammoximation wastewater of claim 1, wherein the heat exchanger is a spiral plate type heat exchanger.
5. The double-effect deamination and heat energy recovery system of ammoximation wastewater according to claim 1, wherein a filter is arranged between the wastewater feed pump and the tube side of the heat exchanger.
6. The double-effect deamination and heat energy recovery system of ammoximation wastewater according to claim 1, wherein the packing is arranged in an atmospheric tower and a pressurizing tower.
7. The double-effect deamination and heat energy recovery system of ammoximation wastewater of claim 1, wherein the reboiler is a thermosiphon reboiler.

Description

Double-effect deamination and heat energy recovery system for ammoximation wastewater Technical Field The utility model relates to a double-effect deamination and heat energy recovery system for ammoximation wastewater. Background In the caprolactam production process, cyclohexanone ammoximation reaction can generate a large amount of ammonia-containing wastewater, wherein the ammonia content of the wastewater is about 3 percent, and the wastewater mainly comes from water carried by hydrogen peroxide and water generated by the reaction. At present, the treatment of the wastewater mainly depends on an ammonia distillation technology of a single-effect ammonia analysis tower, but the technology has a plurality of problems. On the one hand, the single-effect ammonia-resolving tower consumes about 160kg of steam per ton of wastewater, and takes a caprolactam device of 40 ten thousand tons/year as an example, 45 tons of wastewater are produced per hour, and the steam consumption is as high as 7.2t/h, so that the production cost is obviously increased. Such high energy consumption has become a critical factor in restricting industry development at the moment when energy shortage and cost control are critical. On the other hand, the ammonia content of the wastewater treated by the single-effect ammonia analysis tower still reaches 200-250ppm, so that the ammonia nitrogen load of the wastewater is too high, the wastewater is difficult to meet increasingly strict environmental protection standards, and huge environmental protection pressure is brought to enterprises. Furthermore, there is a serious waste in the prior art in terms of heat energy utilization. The wastewater at the top of the tower is directly cooled by circulating water, the wastewater at the bottom of the tower is cooled to 40 ℃ by the cooling water and then is sent out, a large amount of gasification heat is not utilized, and a large amount of cooling capacity is consumed in the cooling process, so that the production cost is further increased. At present, an atmospheric tower deamination mode is generally adopted in the industry, so that not only is steam consumption high, but also the ammonia nitrogen in the wastewater is not removed well, and the requirements of energy conservation, emission reduction and cost reduction of enterprises cannot be met. Therefore, developing a high-efficiency, energy-saving and environment-friendly wastewater deamination and heat energy recycling technology has become a key problem to be solved urgently in the caprolactam industry. Disclosure of utility model The utility model aims to provide a double-effect deamination and heat energy recovery system for ammoximation wastewater, which is used for solving the problems of high energy consumption, high ammonia nitrogen emission and heat energy waste existing in the prior cyclohexanone ammoximation wastewater treatment in caprolactam production. In order to solve the problems, the technical scheme of the utility model is as follows: A double-effect deamination and heat energy recovery system for ammoximation wastewater comprises a wastewater tank, a wastewater feed pump, a heat exchanger, an atmospheric tower, an atmospheric discharge pump, a pressurizing tower, a pressurizing discharge pump, a wastewater cooler, a condenser, an ammonia water cooler, an ammonia water tank, an ammonia water discharge pump, an alkane washing tower, a tail gas absorption tower and a reboiler, wherein the wastewater tank is sequentially communicated with the wastewater feed pump, the heat exchanger tube side, the atmospheric tower, the atmospheric discharge pump, the pressurizing tower, the pressurizing discharge pump, the heat exchanger shell side and the wastewater cooler through pipelines, the top of the atmospheric tower is sequentially communicated with the condenser, the ammonia water cooler, the ammonia water tank, the ammonia water discharge pump and the alkane washing tower through pipelines, the gas phase outlet of the condenser is sequentially communicated with the tail gas absorption tower through pipelines, the top of the pressurizing tower is sequentially communicated with the reboiler shell side, the ammonia water condensation tank, the ammonia water condensation discharge pump and the alkane washing tower through pipelines, and the reboiler tube side is communicated with the atmospheric tower. Further, the top of the ammonia tank is communicated with a pipeline between the condenser and the atmospheric tower through a first water return pipe, and a first water delivery valve is arranged on the first water return pipe. Further, the top of the ammonia water condensing tank is communicated with a pipeline between the reboiler and the pressurizing tower through a second water return pipe, and a second water delivery valve is arranged on the second water return pipe. The beneficial effects of the utility model are as follows: 1. The system adopts a double-effect ammonia analysis