Waste heat utilization device for low-temperature methanol washing regeneration tower
By installing a heat exchanger and waste heat recovery components in the low-temperature methanol washing and regeneration tower, heat exchange between the high-temperature lean methanol solution and the low-temperature rich methanol solution, as well as gas heat recovery, are achieved. This solves the problem of the high-temperature methanol solution not being recycled, reduces heater energy consumption, and improves thermal energy utilization efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2026-04-10
AI Technical Summary
In the existing technology, the high-temperature methanol solution is not recycled to the low-temperature rich methanol solution, which leads to increased energy consumption of the heater and lacks effective heat recovery and reuse measures.
By installing a heat exchanger and waste heat recovery components in the low-temperature methanol washing regeneration tower, the initial heat exchange between the high-temperature lean methanol solution and the low-temperature rich methanol solution is achieved, followed by a secondary heat exchange with the regeneration tower gas. Combined with pressure sensors, thermometers, and PLC controllers, the energy consumption of the heater is precisely controlled, the fluid flow rate is optimized, and the efficient recovery and utilization of thermal energy is realized.
It effectively reduces the energy consumption of heaters, improves the efficiency of heat energy regeneration and utilization, and reduces resource waste.
Smart Images
Figure CN224100345U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to low temperature methanol washing equipment technical field, specifically related to a low temperature methanol washing regenerator waste heat utilization device. BACKGROUND
[0002] In coal chemical industry or natural gas purification process, methanol washing process is often used to remove acid gas (such as H2S, CO2) in gas, low temperature methanol washing uses the high solubility of methanol to acid gas at low temperature (-30℃ to -60℃), selectively absorbs these gases, and the solubility of methanol to H2, CO and other effective gases is low, so as to realize efficient separation. Process flow is: the raw gas after pretreatment is contacted with low temperature methanol solution in the absorption tower, the acid gas is absorbed by the low temperature methanol solution to form rich methanol solution, then enters the regenerator, and the acid gas is released by heating or reducing pressure, and the regenerated methanol is returned to the absorption tower after cooling for recycling. The regenerator is a key equipment in the methanol washing process, which is used to desorb the acid gas in the rich methanol solution, and the methanol solution out of the regenerator has high temperature, in the prior art, the high temperature methanol solution out of the regenerator is directly introduced into the heat exchanger for heat exchange and cooling, and the low temperature rich methanol solution out of the absorption tower is introduced into the heater for heating, the high temperature methanol solution is not recycled to the low temperature rich methanol solution, which increases the energy consumption of the heater, and there is lack of effective heat energy recovery and recycling measures. CONTENT
[0003] The utility model aims at providing a kind of low temperature methanol washing regenerator waste heat utilization device, to solve the problems in prior art, high temperature methanol solution is not recycled to the low temperature rich methanol solution, which increases the energy consumption of the heater, and there is lack of effective heat energy recovery and recycling measures.
[0004] To achieve the above-mentioned purpose, the basic scheme provided by the utility model is: a low temperature methanol washing regenerator waste heat utilization device, comprising an absorption tower and a regenerator, a liquid pipe one is communicated with the liquid outlet of the absorption tower, a shell side inlet of a heat exchanger one is communicated with the liquid pipe one, a liquid pipe two is communicated with the shell side inlet and outlet of the heat exchanger one, a waste heat recovery assembly for regenerator gas waste heat utilization is communicated with the liquid pipe two, a heater is communicated with the waste heat recovery assembly, a heat preservation pipe is communicated with the liquid outlet of the heater, the heat preservation pipe and the regenerator are communicated, a liquid pipe four is communicated with the liquid outlet of the regenerator, the liquid pipe four is communicated with the tube side inlet of the heat exchanger one, a liquid pipe five is communicated with the tube side outlet of the heat exchanger one, and the liquid pipe five is communicated with the liquid inlet of the absorption tower.
[0005] The utility model discloses a principle and beneficial effect lies in: when using, the high temperature lean methanol solution from the regenerator and the low temperature rich methanol solution from the absorption tower are carried out first heat exchange through heat exchanger one, and the rich methanol solution after exchange carries out second heat exchange with the regenerator gas through waste heat recovery assembly, makes the low temperature rich methanol solution temperature rise, reduces the consumption of heater, and the high temperature lean methanol solution is reduced, reduces the resource of absorption tower cooling, and effectively recycles heat energy.
[0006] Scheme two, this is the preferred basis scheme, waste heat recovery assembly includes heat exchanger two, and liquid pipe two is connected with the cold fluid inlet of heat exchanger two, and the cold fluid outlet of heat exchanger two is connected with liquid pipe three, and liquid pipe three is connected with the liquid inlet of heater, and the gas outlet of regenerator is connected with the hot fluid inlet of heat exchanger two, and the hot fluid outlet of heat exchanger two is connected with gas outlet pipe, and the heat in the gas that regenerator resolves is carried out heat exchange with rich methanol solution through heat exchanger two, and the heat in the gas is recycled, and the energy consumption of heater is further reduced.
[0007] Scheme three, this is the preferred scheme two, and the gas outlet of regenerator and gas outlet pipe are all equipped with pressure sensor, and pressure sensor can accurately measure pressure change, provides real-time data, ensures that equipment is efficiently operated and user safety.
[0008] Scheme four, this is the preferred scheme two, and liquid pipe one and liquid pipe three are all equipped with thermometer, and thermometer is electrically connected with PLC controller, and thermometer can detect the temperature of methanol solution in real time and give PLC controller, and the energy consumption of heater is accurately controlled through PLC controller, and the energy consumption of heater is further reduced.
[0009] Scheme five, this is the preferred scheme two, and heat exchanger two is plate heat exchanger, and heat exchanger one is shell and tube heat exchanger, in the gas heat exchange process of rich methanol and regenerator gas outlet, plate heat exchanger transfers the heat energy between gas and liquid through its efficient heat transfer efficiency, realizes gas-liquid heat conversion, and shell and tube heat exchanger carries out heat transfer through pipe wall, can bear certain fluid pressure and temperature, is suitable for the heat exchange between high-temperature fluid and low-temperature fluid.
[0010] Scheme six, this is the preferred scheme two, and liquid pipe one, liquid pipe two, liquid pipe four, liquid pipe five and heat preservation pipe are all equipped with flow sensor and electromagnetic valve, and flow sensor and electromagnetic valve are electrically connected with PLC controller, and flow sensor can monitor the flow rate of methanol in real time and give PLC controller, and PLC controller adjusts the flow of methanol solution through electromagnetic valve, and the circulation efficiency of methanol solution is increased. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 It is the structure schematic diagram of low temperature methanol washing regenerator waste heat utilization device of the utility model. DETAILED DESCRIPTION
[0012] The present invention will be further described in detail below through specific embodiments:
[0013] The reference numerals in the accompanying drawings of the instruction manual include: 1. Regeneration tower, 2. Heat exchanger one, 3. Absorption tower, 4. Liquid pipe one, 5. Liquid pipe two, 6. Liquid pipe three, 7. Liquid pipe four, 8. Heater, 9. Pressure sensor, 10. Heat exchanger two, 11. Thermometer, 12. Flow sensor, 13. Liquid pipe five, 14. Solenoid valve, 15. Gas outlet pipe, 16. Insulation pipe.
[0014] Example
[0015] like Figure 1 The following is a description of a low-temperature methanol washing regeneration tower waste heat utilization device: It includes an absorption tower 3 and a regeneration tower 1. The outlet of the absorption tower 3 is connected to a liquid pipe 4, which is connected to the shell-side inlet of a heat exchanger 2 (a shell-and-tube heat exchanger). The shell-side outlet of the heat exchanger 2 is connected to a liquid pipe 5, which is connected to a waste heat recovery component for utilizing the gas waste heat of the regeneration tower 1. The waste heat recovery component includes a heat exchanger 10 (a plate heat exchanger). The liquid pipe 5 is connected to the cold fluid inlet of the heat exchanger 10, and the cold fluid outlet of the heat exchanger 10 is connected to a liquid pipe 6, which is connected to the liquid inlet of a heater 8. The outlet of the heater 8 is connected to an insulation pipe 16, which is connected to the liquid inlet of the regeneration tower 1. The gas outlet of the regeneration tower 1 is connected to the hot fluid inlet of the heat exchanger 10, and the hot fluid outlet of the heat exchanger 10 is connected to an outlet pipe 15. Pressure sensors 9 are installed on the outlet and outlet pipe 15 of regeneration tower 1. Pressure sensors 9 are JYB series from Beijing Kunlun Coast. Thermometers 11 are installed on liquid pipe 4 and liquid pipe 6. Thermometers 11 are digital temperature sensors, model LM75. Thermometers 11 are electrically connected to the PLC controller. Liquid pipe 7 is connected to the outlet of regeneration tower 1. Liquid pipe 7 is connected to the tube inlet of heat exchanger 2. Liquid pipe 13 is connected to the tube inlet and outlet of heat exchanger 2. Liquid pipe 13 is connected to the inlet of absorption tower 3. Flow sensors 12 and solenoid valves 14 are installed on liquid pipe 4, liquid pipe 5, liquid pipe 7, liquid pipe 13 and insulation pipe 16. Flow sensors 12 are Shanghai Guanghua electromagnetic flow meters, model LDG-M. Solenoid valves 14 are ST series from Jiangsu Shentong solenoid valves. Flow sensors 12 and solenoid valves 14 are electrically connected to the PLC controller.
[0016] The embodiment of the present application is that the low-temperature methanol solution from the absorption tower 3 enters the heat exchanger 1 through the liquid pipe 4, exchanges heat with the high-temperature methanol solution from the regeneration tower 1, the low-temperature methanol solution after heat exchange enters the heat exchanger 2 through the liquid pipe 5, exchanges heat with the gas from the regeneration tower 1, the methanol solution after heat exchange enters the heater 8 through the liquid pipe 6, and then enters the regeneration tower 1 through the heat preservation pipe 16 for regeneration and analysis; the high-temperature methanol solution after analysis enters the heat exchanger 1 through the liquid pipe 7, the methanol solution after heat exchange enters the absorption tower 3 through the liquid pipe 5, and the gas from the regeneration tower 1 enters the heat exchanger 2 through the gas pipe 15.
[0017] The thermometer 11 detects the temperature of the methanol solution in real time and transmits the temperature to the PLC controller, the energy consumption of the heater 8 is accurately controlled through the PLC controller, and the energy consumption of the heater 8 is further reduced; the flow sensor 12 monitors the flow rate of the methanol in real time and transmits the flow rate to the PLC controller, and the PLC controller adjusts the flow rate of the methanol solution through the electromagnetic valve 14.
[0018] The above is only the embodiment of the present application, and the specific structure and characteristics of the scheme and the like are not described in detail. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.
Claims
1. A low-temperature methanol washing regenerator waste heat utilization device, characterized in that, The application relates to a heat exchange device for a gas-liquid absorption tower, which comprises an absorption tower (3) and a regeneration tower (1), a liquid pipe one (4) is communicated with a liquid outlet of the absorption tower (3), a shell inlet of a heat exchanger one (2) is communicated with the liquid pipe one (4), a liquid pipe two (5) is communicated with a shell outlet of the heat exchanger one (2), a waste heat recovery assembly for utilizing waste heat of the regeneration tower (1) is communicated with the liquid pipe two (5), a heater (8) is communicated with the waste heat recovery assembly, a heat preservation pipe (16) is communicated with a liquid outlet of the heater (8), the heat preservation pipe (16) is communicated with the regeneration tower (1), a liquid pipe four (7) is communicated with a liquid outlet of the regeneration tower (1), a tube inlet of the heat exchanger one (2) is communicated with the liquid pipe four (7), a liquid pipe five (13) is communicated with a liquid inlet of the heat exchanger one (2), and the liquid pipe five (13) is communicated with a liquid inlet of the absorption tower (3).
2. The low-temperature methanol washing regenerator waste heat utilization device according to claim 1, characterized in that The waste heat recovery assembly comprises a heat exchanger two (10), the liquid pipe two (5) is communicated with a cold fluid inlet of the heat exchanger two (10), a liquid pipe three (6) is communicated with a cold fluid outlet of the heat exchanger two (10), a liquid inlet of the heater (8) is communicated with the liquid pipe three (6), a gas outlet of the regeneration tower (1) is communicated with a hot fluid inlet of the heat exchanger two (10), and a gas outlet pipe (15) is communicated with a hot fluid outlet of the heat exchanger two (10).
3. The low-temperature methanol washing regenerator waste heat utilization device according to claim 2, characterized in that, Pressure sensors (9) are arranged on the gas outlet of the regeneration tower (1) and the gas outlet pipe (15).
4. The low-temperature methanol washing regenerator tower waste heat utilization device according to claim 2, characterized in that, Temperature gauges (11) are arranged on the liquid pipe one (4) and the liquid pipe three (6), and the temperature gauges (11) are electrically connected with a PLC controller.
5. The low-temperature methanol washing regenerator tower waste heat utilization device according to claim 2, characterized in that The heat exchanger two (10) is a plate heat exchanger, and the heat exchanger one (2) is a shell-and-tube heat exchanger.
6. The low-temperature methanol washing regenerator tower waste heat utilization device according to claim 2, characterized in that, Flow sensors (12) and electromagnetic valves (14) are arranged on the liquid pipe one (4), the liquid pipe two (5), the liquid pipe four (7), the liquid pipe five (13) and the heat preservation pipe (16), and the flow sensors (12) and the electromagnetic valves (14) are electrically connected with the PLC controller.