CN215373019U - Waste heat recovery system for esterification polymerization reaction - Google Patents
Waste heat recovery system for esterification polymerization reaction Download PDFInfo
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- CN215373019U CN215373019U CN202121520320.1U CN202121520320U CN215373019U CN 215373019 U CN215373019 U CN 215373019U CN 202121520320 U CN202121520320 U CN 202121520320U CN 215373019 U CN215373019 U CN 215373019U
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- 238000005886 esterification reaction Methods 0.000 title claims abstract description 31
- 230000032050 esterification Effects 0.000 title claims abstract description 26
- 239000002918 waste heat Substances 0.000 title claims abstract description 26
- 238000011084 recovery Methods 0.000 title claims abstract description 22
- 238000006116 polymerization reaction Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000003507 refrigerant Substances 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 239000002351 wastewater Substances 0.000 claims description 13
- 238000010248 power generation Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 230000001932 seasonal effect Effects 0.000 abstract description 3
- 239000010865 sewage Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 6
- 238000005057 refrigeration Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 229920000098 polyolefin Polymers 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- -1 iron ion Chemical class 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000000855 fermentation Methods 0.000 description 2
- 230000004151 fermentation Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000012685 gas phase polymerization Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
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- 230000001502 supplementing effect Effects 0.000 description 1
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Abstract
The utility model discloses a waste heat recovery system for esterification polymerization reaction, which is characterized by comprising the following components: the separation device is used for separating high-temperature steam in waste heat generated by the esterification polymerization reaction; a turbine unit including a steam turbine that converts thermal energy into mechanical energy using the high-temperature steam; high-temperature steam is converted into steam-water mixture through a turbine device and is discharged; the evaporator is used for heating a low-pressure refrigerant to a gaseous state or a gas-liquid mixed state by utilizing the latent heat of the steam-water mixture output by the turbine device; the steam-water mixture passes through an evaporator and then condensed water is output; and the blending reaction tank is used for treating the condensed water output by the evaporator. The utility model recovers and converts the hot steam generated by the reaction kettle into electric energy or provides power for hot and cold supply through the expansion turbine, converts sensible heat and latent heat accompanied with the reaction into usable energy, can improve the heat cycle efficiency of the whole process system, improves the utilization efficiency of the recovered energy, and adapts to the energy requirements under the conditions of different seasonal changes.
Description
Technical Field
The utility model relates to the technical field of chemical industry, in particular to waste heat recovery of esterification polymerization reaction.
Background
In the production of PET, a certain amount of esterification steam is always generated, in theory, 186Kg of water is generated every 1T of PET, the running condition of the existing PET and EG separation equipment is monitored, 370g of low-grade steam is generated every 1T of PET, in the traditional process, the esterification steam is generally cooled by an air cooler, a large amount of electric energy is consumed by an air cooling fan, and the energy waste is huge. In order to improve the utilization efficiency of the waste heat of the esterification steam, part of polyester production enterprises adopt a lithium bromide refrigerating unit to recycle the waste heat of the esterification steam, but the lithium bromide refrigerating unit is only used in summer, and the esterification steam is still cooled by an air cooler in winter and spring and autumn, so that the comprehensive heat energy utilization efficiency of the lithium bromide refrigerating unit is low. The residual heat of the partial esterification steam can be effectively utilized, huge economic benefits can be generated, and the industrial policy of national energy conservation and emission reduction for carbon neutralization is met.
Esterification wastewater and fiber wastewater can be generated in the process of producing PET, the esterification wastewater and the fiber wastewater need to be blended and treated in a biological fermentation mode, the esterification wastewater is treated through flotation, biological filtration, ozone catalytic oxidation and filtration, and the effluent of a secondary sedimentation tank is further treated, so that the COD concentration, turbidity, oil content and iron ion content of the effluent are reduced to standard quantification, the treated sewage can meet the standard of circulating cooling water supplementing water, heat with a certain temperature is contained in the sewage, although the extractable heat is not much, the waste heat is still generated when the treated sewage directly enters a biological fermentation tank,
typically, the polyolefin is prepared by particle form polymerization (e.g., slurry polymerization or gas phase polymerization). The polymerization of ethylene is highly exothermic, giving up about 945kWh of heat per 1 ton of polyethylene produced. Furthermore, the production units of polyethylene are the main energy consumers. A large amount of heat from the industry is released to the atmosphere, which not only results in energy losses but also increases air pollution. Other equipment in the polyolefin manufacturing process consumes energy. A pump for circulating the liquid reaction mixture in the polymerization reactor (e.g., a loop slurry reactor); a pump that circulates a cooling medium (e.g., treated water) through the polymerization reactor jacket; a compressor for pressurizing and returning the recycled diluent to the polymerization reactor; an air blower for transporting fluff and particulate material; and an extruder for converting the polyolefin fluff into polyolefin pellets. Therefore, the production of polyolefins is an energy intensive process that consumes electricity, steam, fuel gas, and the like. Such energy consumption generally increases the cost of the manufacturing enterprise.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a waste heat recovery system for esterification polymerization reaction for realizing waste heat recycling.
In order to solve the technical problems, the utility model adopts the technical scheme that:
a waste heat recovery system for esterification polymerization reaction is characterized by comprising:
the separation device is used for separating high-temperature steam in waste heat generated by the esterification polymerization reaction;
a turbine unit including a steam turbine that converts thermal energy into mechanical energy using the high-temperature steam; high-temperature steam is converted into steam-water mixture through a turbine device and is discharged;
the evaporator is used for heating a low-pressure refrigerant to a gaseous state or a gas-liquid mixed state by utilizing the latent heat of the steam-water mixture output by the turbine device; the steam-water mixture passes through an evaporator and then condensed water is output;
and the blending reaction tank is used for treating the esterification sewage and the condensed water output by the evaporator.
The turbine device also comprises a compressor, wherein the compressor is used for compressing a low-temperature and low-pressure refrigerant; the compressed refrigerant is input into a condenser.
The output end of the steam turbine is connected with a steam turbine generator, and the steam turbine generator is used for converting mechanical energy output by the steam turbine into electric energy.
The steam turbine generator comprises a generator, a power generation control system and a grid-connected system; and a system proportional valve and a steam regulating valve are arranged between the separation device and the steam turbine and are connected with a power generation control system of the steam turbine generator set.
The waste heat recovery device also comprises a reclaimed water heat exchanger, and heat is extracted from the waste water generated by the esterification reaction through heat exchange; and the waste water after heat exchange enters a blending reaction tank.
Compared with the prior art, the utility model has the beneficial effects that:
this application esterification steam waste heat recovery is with driving system, refrigerating system, heating system coupling, and the hot steam that produces reation kettle is retrieved through expansion turbine and is converted the electric energy or for the hot cold supply provides power, all converts the steam sensible heat that accompanies of reaction and latent heat into usable energy, can improve whole process systems's thermal cycle efficiency, has improved the utilization efficiency of recovered energy, has adapted to the energy demand under the different seasonal variation condition simultaneously.
The expansion energy and the phase change latent heat of the steam are effectively utilized, different functions are generated to correspond to different devices, the stepped utilization of the steam by a turbine and an evaporator is realized, and the heat efficiency of the integrated system can reach more than 80%.
The generator and the compressor of the power system are arranged on two sides of the steam turbine, and the switching of each mode is realized by the connection and disconnection of the brake connection.
The system can reduce carbon emission for enterprises, achieve environmental protection and generate abundant economic benefits.
The temperature of the wastewater generated by the esterification reaction is usually 10-20 ℃ higher than the ambient temperature, the wastewater directly enters a blending tank to directly waste the temperature difference, the temperature difference heat exchange of 2-3 ℃ can be extracted from the wastewater through a reclaimed water heat exchanger, the recoverable heat is huge, more input energy can be saved for refrigeration and heating circulation, and the economic benefit is obvious;
for the esterification production enterprises adopting the absorption refrigerating units, the cooling demand is only met, the esterification reaction heat can still be wasted when the cooling demand is not met, the cold and hot modules are additionally arranged to output power, the cold and hot demands in four seasons of spring, summer, autumn and winter are met, extra load power supply is provided, and the heat gradient utilization of the temperature is realized, so that the system thermal efficiency of the device is improved.
The condensation heat part of the turbine exhaust steam is absorbed by the evaporator, so that the consumption of cooling circulating water is reduced.
Drawings
FIG. 1 is a block diagram of a steam waste heat recovery system of the present invention;
FIG. 2 is a block diagram of a heating mode of the steam waste heat recovery system according to the present invention;
FIG. 3 is a block diagram of the power generation mode of the steam waste heat recovery system of the present invention;
fig. 4 is a refrigeration mode block diagram of the steam waste heat recovery system of the present invention.
Detailed Description
The utility model is described in detail below with reference to the accompanying drawings:
as shown in fig. 1, the system for recovering waste heat from esterification polymerization mainly recovers and utilizes the waste heat of steam and waste water generated from esterification and polymerization. The system mainly comprises a steam recovery system, a sewage system, a circulating water system, a refrigerant system, a power system and the like, wherein heat exchange and function conversion relations exist among the systems, available heat, cold and electric energy are finally output for users, the accompanying heat generated by the esterification reaction is effectively converted into the available energy, and the energy output form is adjusted according to seasonal changes.
The steam recovery system comprises a reaction kettle, a separation device, a proportional valve, a regulating valve and a turbine device. Wherein the separation device is connected with a steam outlet of the reaction kettle. In one embodiment, the separation apparatus employs a separation column. The turbine unit comprises a steam turbine and a compressor, and the proportional valve and the regulating valve are connected to a connecting pipeline of the separation tower and the steam turbine.
The sewage system comprises a reclaimed water diversion pump, a circulating water cooler, an air cooler and a blending reaction tank.
The refrigerant system comprises a refrigerant channel of the condenser and a refrigerant channel of the evaporator.
The power system is a steam turbine generator and comprises a generator, a power generation control system and a grid-connected system. The system proportional valve and the steam regulating valve are connected with a power generation control system of the steam turbine generator set, so that the heat distribution of efficient heat exchange of the system is guaranteed, the stable and efficient operation of rear-end dragging equipment is met, and the occurrence of mechanical equipment faults is reduced.
The polyester steam pressure is usually 100-115 Kpa, the temperature is 100-105 ℃, the steam quality is poor at the temperature, but the available enthalpy still contains 2675Kj/Kg, the steam is changed into a steam-water mixture at 45-55 ℃ by generating driving energy through a high expansion ratio turbine, then the steam enters an evaporator to heat a low-pressure refrigerant to a gaseous state or a gas-liquid mixed state by utilizing latent heat, and water is completely condensed and then is converged into a blending reaction tank for treatment.
The steam is divided into a main path and a bypass path through a proportional valve, the main path enters a steam turbine, the bypass path steam directly enters a circulating water cooler, all the steam enters the cooler through the bypass path when the main path is cut off in an emergency, and a large amount of circulating water is needed to maintain the heat exchange requirement of the system.
The temperature of the esterification sewage in winter and autumn is 10-20 degrees higher than the ambient temperature, the general water-water heat exchange is not economical due to too small temperature difference, the esterification sewage can be used as a first-stage heat exchanger of a refrigerant, the temperature difference heat exchange amount of 2-3 degrees can be extracted from the reclaimed water, and the reclaimed water and condensed condensate water are converged into a blending reaction tank.
The waste heat recovery system can work in a heating mode, referring to fig. 2, in the heating process, the evaporation pressure of an evaporator is 1.1Mpa, a refrigerant working medium reaches a saturated vapor state, a steam turbine generates driving work to drive a compressor to compress a low-temperature and low-pressure refrigerant to 3.4Mpa, heat is converted into primary hot water for a heat exchange station through heat exchange of a condenser, the temperature change difference of the water at the user side in the condenser is large, therefore, the refrigerant is often in a two-phase region in the condenser, in order to improve the system conversion efficiency, the refrigerant separates gas from the liquid through a float valve of an economizer, the gas enters the middle stage of the compressor to be compressed, the liquid part is changed into the low-temperature and low-pressure refrigerant through a throttling element, the low-temperature and low-pressure refrigerant enters a middle water heat exchanger, the heat is extracted from middle water and then enters the evaporator to perform the next cycle; the driving energy required by the heating link is larger, no extra energy is supplied for power generation, and therefore the generator and the steam turbine are in a separation state.
When refrigeration and heating are not needed, all steam enters the turbine to generate mechanical energy to drive the motor to generate electricity, a brake which can be disengaged is arranged between the steam turbine and the generator, and all dead steam of the steam turbine enters the circulating water cooler; at this time, the waste heat recovery system of the present invention operates in a power generation mode, see fig. 3.
In summer, the waste heat recovery system works in a cooling mode, as shown in fig. 4. The refrigeration cycle of the refrigeration mode is similar to the heating cycle, but the refrigerant is not connected to the reclaimed water heat exchange, meanwhile, the evaporator heat measurement is connected to the fresh air system on the user side, cold air is continuously sent to the user, the driving energy of refrigeration consumed by heating is greatly reduced, the steam turbine drives the compressor, extra power is used for generating electricity, the input power of the compressor is adjusted according to the requirement of the connected user amount, the steam amount entering the main path and the bypass is adjusted through the proportional valve, and the constant-speed operation of the compressor is maintained.
The annual production of 50 ten thousand tons of polyester devices generates 18.5 ten thousand tons of steam and 9.3 ten thousand tons of sewage, and 1500Kw of electric power can be output after complete power generation; the refrigerating capacity of 5200Kw can be generated in the refrigerating mode, and the heat quantity of 5800Kw can be generated in the heating mode.
6250 tons of standard coal can be saved all the year round, the emission of carbon dioxide is reduced by 2.29 ten thousand tons every year, and the economic benefit of more than 500 ten thousand yuan can be generated each year.
Claims (5)
1. A waste heat recovery system for esterification polymerization reaction is characterized by comprising:
the separation device is used for separating high-temperature steam in waste heat generated by the esterification polymerization reaction;
a turbine unit including a steam turbine that converts thermal energy into mechanical energy using the high-temperature steam; high-temperature steam is converted into steam-water mixture through a turbine device and is discharged;
the evaporator is used for heating a low-pressure refrigerant to a gaseous state or a gas-liquid mixed state by utilizing the latent heat of the steam-water mixture output by the turbine device; the steam-water mixture passes through an evaporator and then condensed water is output;
and the blending reaction tank is used for treating the condensed water output by the evaporator.
2. The heat recovery system of claim 1, wherein the turbine unit further comprises a compressor for compressing a low-temperature and low-pressure refrigerant; the compressed refrigerant is input into a condenser.
3. A heat recovery system according to claim 1, wherein a steam turbine generator is connected to the output of the steam turbine for converting the mechanical energy output by the steam turbine into electrical energy.
4. The heat recovery system of claim 3, wherein the steam turbine generator includes a generator, a power generation control system, and a grid-tie system; and a system proportional valve and a steam regulating valve are arranged between the separation device and the steam turbine and are connected with a power generation control system of the steam turbine generator set.
5. The waste heat recovery system of claim 1, further comprising a reclaimed water heat exchanger for extracting heat from the waste water produced by the esterification reaction by heat exchange; and the waste water after heat exchange enters a blending reaction tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121520320.1U CN215373019U (en) | 2021-07-06 | 2021-07-06 | Waste heat recovery system for esterification polymerization reaction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121520320.1U CN215373019U (en) | 2021-07-06 | 2021-07-06 | Waste heat recovery system for esterification polymerization reaction |
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| Publication Number | Publication Date |
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| CN215373019U true CN215373019U (en) | 2021-12-31 |
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| CN202121520320.1U Active CN215373019U (en) | 2021-07-06 | 2021-07-06 | Waste heat recovery system for esterification polymerization reaction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110078904A (en) * | 2019-05-23 | 2019-08-02 | 上海聚友化工有限公司 | A kind of polyester esterification steam waste heat utilizes method and device |
-
2021
- 2021-07-06 CN CN202121520320.1U patent/CN215373019U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110078904A (en) * | 2019-05-23 | 2019-08-02 | 上海聚友化工有限公司 | A kind of polyester esterification steam waste heat utilizes method and device |
| CN110078904B (en) * | 2019-05-23 | 2023-11-07 | 上海聚友化工有限公司 | Polyester esterification steam waste heat utilization method and device |
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Denomination of utility model: A waste heat recovery system for esterification polymerization reaction Effective date of registration: 20231206 Granted publication date: 20211231 Pledgee: Bank of China Limited by Share Ltd. Nanjing Jiangning branch Pledgor: Jiangsu LUHANG Power Technology Co.,Ltd. Registration number: Y2023980069325 |