CN-224215421-U - Circulating water backwater waste heat recovery system

Abstract

The utility model provides a circulating water backwater waste heat recovery system, wherein a compression heat pump unit is arranged between a circulating water field and a municipal heat supply network water supply pipeline, heat of waste heat water in the circulating water is transferred to backwater in the municipal heat supply network water supply pipeline through the compression heat pump unit, heat is supplied to the heat supply network, and the waste heat water after heat recovery is returned to the circulating water field. The system adopts a compression heat pump technology, realizes the efficient recycling of the waste heat of the circulating water, ensures that the waste heat recycling amount meets the regional heating requirement, can reduce the running number of fans of a circulating water field, saves the electric quantity, reduces the heat dissipation and evaporation amount of the circulating water, reduces the real-time water supplementing amount, saves the fresh water consumption, reduces the direct discharge of the waste heat and reduces the heat pollution.

Inventors

• WU CHUNMING
• HU ZHONGQING
• CHEN ZHIGANG
• WANG SHENGYU
• Zhai Baichun
• MENG FANHUI

Assignees

• 北方华锦化学工业股份有限公司

Dates

Publication Date

20260508

Application Date

20250530

Claims (8)

1. 1. The circulating water backwater waste heat recovery system is characterized in that a compression heat pump unit is arranged between a circulating water field and a municipal heat supply network water supply pipeline, heat of the waste heat water in the circulating water is transferred to backwater in the municipal heat supply network water supply pipeline through the compression heat pump unit, water supply of the heat supply network is heated, and the waste heat water after heat recovery is returned to the circulating water field.
2. 2. The circulating water backwater waste heat recovery system of claim 1, wherein said compression heat pump unit comprises a plurality of electric compression heat pumps.
3. 3. The circulating water backwater waste heat recovery system of claim 2, wherein the voltage-condensation heat pump comprises an evaporator, a condenser, a compressor and a throttling device, wherein the evaporator is connected with a circulating water field through two pipelines, the condenser is connected with a heat supply pipeline of a heat supply network through two pipelines, waste heat water in the circulating water field is led out from a waste heat pipe network, is pressurized by a waste heat water circulating water pump and enters the evaporator, electric energy is input into the compressor as circulating power, refrigerating working media circulate in a compression heat pump unit and generate phase change, heat is extracted from the waste heat water flowing through the evaporator, the water temperature of the waste heat water after the heat extraction is reduced, the water returns to the circulating water field through the pipelines, and the condenser transfers the extracted heat to the circulating water at the demand side to heat backwater in the water supply pipeline of the heat supply network.
4. 4. The circulating water backwater waste heat recovery system of claim 3, wherein said throttling device employs an expansion valve.
5. 5. The circulating water backwater waste heat recovery system of claim 2, wherein said compression heat pump unit comprises 20 electric compression heat pumps.
6. 6. The circulating water backwater waste heat recovery system of claim 5, wherein the 20 electric compression heat pumps comprise 6 electric compression heat pumps of 14.6MW, 6 electric compression heat pumps of 8.5MW, 6 electric compression heat pumps of 7.84MW and 2 electric compression heat pumps of 12.6 MW.
7. 7. The circulating water backwater waste heat recovery system of claim 2, wherein the corresponding types and numbers of electric compression heat pumps are selected for combination according to waste heat recovery requirements, and the circulating water backwater waste heat recovery work is completed jointly.
8. 8. The circulating water backwater waste heat recovery system of claim 3, wherein the diameter of the pipeline is 1620mm and the wall thickness is 12mm.

Description

Circulating water backwater waste heat recovery system Technical Field The utility model belongs to the technical field of circulating water waste heat recovery in chemical production, and particularly relates to a circulating water backwater waste heat recovery system adopting a compression heat pump technology, which is suitable for efficiently recycling the circulating water waste heat. Background The circulating water field comprises 10 cooling towers, 2 tower ponds, 2 water absorption ponds, 5 circulating water pumps, 2 turbine sets and a heat exchanger. The system supplies circulating cooling water with the pressure of more than 0.4MPa to an ethylene device, a styrene device, naphtha in a raw material tank area and a hydrogenation tail oil pump heat exchanger, the circulating water quantity reaches 43000m 3/h, the water supply temperature of a circulating water field is 28 ℃, and the water return temperature of the device is 35 ℃. In the existing design, recycling of the waste heat of the circulating water is not considered, a large amount of heat is directly discharged and wasted, and great loss of energy is caused. The production enterprises not only consume more energy sources to maintain production and increase production cost, but also exhaust heat emission does not accord with the environmental protection trend of energy conservation and emission reduction. Disclosure of utility model First, the technical problem to be solved The utility model provides a circulating water backwater waste heat recovery system, which solves the problems of energy waste, high cost and pollution caused by direct discharge of the waste heat of the existing circulating water system, and realizes the efficient recovery and utilization of the circulating water backwater waste heat by a compression heat pump technology, thereby reducing energy consumption and environmental pollution. (II) technical scheme In order to solve the technical problems, the utility model provides a circulating water backwater waste heat recovery system, wherein a compression heat pump unit is arranged between a circulating water field and a municipal heat supply network water supply pipeline, heat of waste heat water in the circulating water is transferred to backwater in the municipal heat supply network water supply pipeline through the compression heat pump unit, heat is supplied to the heat supply network, and the waste heat water after heat recovery is returned to the circulating water field. Further, the compression heat pump unit comprises a plurality of electric compression heat pumps. The electric compression heat pump comprises an evaporator, a condenser, a compressor and a throttling device, wherein the evaporator is connected with a circulating water field through two pipelines, the condenser is connected with a heat supply pipeline of a heat supply network through the two pipelines, waste heat water in the circulating water field is led out from a waste heat pipe network, is pressurized by a waste heat water circulating water pump and enters the evaporator, electric energy is input to the compressor to serve as circulating power, refrigerating working media circulate in a compression heat pump unit and generate phase change, heat is extracted from the waste heat water flowing through the evaporator, the water temperature of the waste heat water is reduced after the heat is extracted, the water temperature is returned to the circulating water field through the pipelines, and the condenser transfers the extracted heat to the circulating water at the demand side to heat backwater in the water supply pipeline of the heat supply network. Further, the throttle device adopts an expansion valve. Further, the compression heat pump unit includes 20 electric compression heat pumps. Further, the 20 electric compression heat pumps comprise 6 14.6MW electric compression heat pumps, 6 8.5MW electric compression heat pumps, 6 7.84MW electric compression heat pumps and 2 12.6MW electric compression heat pumps. Further, according to the waste heat recovery requirement, the electric compression heat pumps with corresponding types and numbers are selected for combination, and the recycling of the waste heat of the circulating water backwater is completed jointly. Further, the diameter of the pipeline was 1620mm and the wall thickness was 12mm. (III) beneficial effects The utility model provides a circulating water backwater waste heat recovery system, wherein a compression heat pump unit is arranged between a circulating water field and a municipal heat supply network water supply pipeline, heat of waste heat water in the circulating water is transferred to backwater in the municipal heat supply network water supply pipeline through the compression heat pump unit, heat is supplied to the heat supply network, and the waste heat water after heat recovery is returned to the circulating water field. The system adopts a compression heat pump technology, re