CN106766362B - Coking system and waste heat recovery system thereof - Google Patents

Coking system and waste heat recovery system thereof Download PDF

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Publication number
CN106766362B
CN106766362B CN201710054844.8A CN201710054844A CN106766362B CN 106766362 B CN106766362 B CN 106766362B CN 201710054844 A CN201710054844 A CN 201710054844A CN 106766362 B CN106766362 B CN 106766362B
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inlet
outlet
power generation
heat
working medium
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CN106766362A (en
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毛旸
徐列
韩冬
陈本成
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Huatai Yongchuang Beijing Technology Co ltd
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Huatai Yongchuang Beijing Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B27/00—Machines, plants or systems, using particular sources of energy
    • F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/04—Purifying combustible gases containing carbon monoxide by cooling to condense non-gaseous materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • F01K27/02—Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
    • Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The invention provides a waste heat recovery system, which comprises a heat pump and a first power generation device, wherein the heat pump comprises a first evaporator and a first condenser, the first evaporator comprises a low-temperature liquid inlet and a high-temperature liquid outlet, the first condenser comprises a high-temperature liquid inlet and a low-temperature liquid outlet, the first power generation device comprises a heat source inlet and a cold source outlet, the heat source inlet is communicated with the corresponding cold source outlet, the heat source inlet of the first power generation device is communicated with the high-temperature liquid outlet of the first evaporator so as to generate power by using the heat of liquid flowing out of the high-temperature liquid outlet, the cold source outlet is communicated with the high-temperature liquid inlet of the heat pump, and the liquid flowing into the first power generation device through the heat source inlet can flow into the first condenser from the cold source outlet after the temperature of the liquid is reduced. The invention also provides a coking system. The coking system comprising the waste heat recovery system has lower energy consumption.

Description

Coking system and waste heat recovery system thereof
Technical Field
The invention relates to the field of coking production, in particular to a coking system and a waste heat recovery system of the coking system.
Background
At present, in the domestic coking process flow, due to the requirement of the coke oven gas purification process, the gas needs to be repeatedly heated and cooled, and correspondingly, a heat source for heating the gas and a cold source for cooling the gas need to be provided. Because a heat source and a cold source are respectively provided, the energy consumption of the coking production process is high, and the energy can not be effectively utilized.
Therefore, how to reduce the energy consumption of the coking process becomes a technical problem to be solved urgently in the field.
Disclosure of Invention
The invention aims to provide a waste heat recovery system for a coking system and the coking system comprising the same, wherein the waste heat recovery system can recover waste heat in cooling water in a coking process and recycle the waste heat, so that the energy consumption of the coking process can be reduced.
In order to achieve the above object, as one aspect of the present invention, there is provided a waste heat recovery system, wherein the waste heat recovery system includes a heat pump and a first power generation device, the heat pump includes a first evaporator and a first condenser, the first evaporator includes a low temperature liquid inlet and a high temperature liquid outlet, the first condenser includes a high temperature liquid inlet and a low temperature liquid outlet, the first power generation device includes a heat source inlet and a cold source outlet, the heat source inlet communicates with a corresponding cold source outlet, the heat source inlet of the first power generation device communicates with the high temperature liquid outlet of the first evaporator to generate power by using heat of liquid flowing out from the high temperature liquid outlet, and the cold source outlet communicates with the high temperature liquid inlet of the heat pump, and liquid flowing into the first power generation device through the heat source inlet is capable of flowing into the first condenser from the cold source outlet after the temperature of the liquid is reduced.
Preferably, the heat pump comprises a heating steam inlet and a condensed water outlet, the heating steam inlet is communicated with the condensed water outlet, the heating steam inlet is used for introducing steam for heating, and the steam is condensed into a liquid state and then flows out of the condensed water outlet.
Preferably, the waste heat recovery system further comprises a condensed water tank, the condensed water tank is communicated with the condensed water outlet, and the condensed water tank is communicated with a low-temperature liquid inlet of the heat pump.
Preferably, the waste heat recovery system further comprises a condensed water replenishing pump, an inlet of the condensed water replenishing pump is communicated with the condensed water tank, and an outlet of the condensed water replenishing pump is communicated with a low-temperature liquid inlet of the heat pump.
Preferably, the first power generation device includes a second evaporator, a second condenser, a first turbine, and a first power generator, the heat source inlet includes a first heat source inlet, the cool source outlet includes a first cool source outlet,
the second evaporator further comprises a first power generation substance outlet and a first power generation substance inlet, the second evaporator is used for accommodating power generation working medium flowing into the second evaporator through the first power generation substance inlet, the first heat source inlet and the first cold source outlet are formed on the first evaporator, the first heat source inlet is communicated with the first cold source outlet so as to heat the power generation working medium by using liquid flowing into the second evaporator through the first heat source inlet, the liquid flowing into the second evaporator through the first heat source inlet can flow out through the first cold source outlet, and the first power generation substance outlet is communicated with the steam inlet of the first turbine;
the first turbine is used for driving the generator to generate electricity;
the second condenser comprises a second power generation working medium inlet and a second power generation working medium outlet which are communicated with each other, the second power generation working medium inlet is communicated with the steam outlet of the first turbine so as to cool and condense the power generation working medium flowing out of the first turbine, and liquid power generation working medium is obtained and can flow out of the second condenser through the second power generation working medium outlet and reach the first power generation working medium inlet of the second evaporator.
Preferably, the first power generation device further comprises a preheater and a working medium pump,
the preheater comprises a third power generation working medium inlet and a third power generation working medium outlet which are communicated with each other, the third power generation working medium inlet is communicated with the second power generation working medium outlet, the third power generation working medium outlet is communicated with the first power generation working medium inlet, and the preheater is used for preheating the power generation working medium flowing into the preheater through the third power generation working medium inlet;
and the inlet of the working medium pump is communicated with the second power generation working medium outlet, and the outlet of the working medium pump is communicated with the third power generation working medium inlet.
Preferably, the heat source inlet includes a second heat source inlet, the cold source outlet includes a second cold source outlet, the second heat source inlet and the second cold source outlet are both formed on the preheater, just the second heat source inlet with the second cold source outlet communicates, the second heat source inlet with the high temperature liquid outlet of the first evaporator communicates, the second cold source outlet with the high temperature liquid inlet of the first evaporator communicates, through the second heat source inlet inflow the liquid of the preheater can pass through the second cold source outlet and flow out.
Preferably, the waste heat recovery system further comprises a system circulating pump, and an inlet of the system circulating pump is communicated with the low-temperature liquid outlet.
Preferably, the waste heat recovery system further comprises a second power generation device, the second power generation device comprises a second turbine, a second power generator and a third condenser, the third condenser comprises a steam inlet, a cooling liquid inlet and a cooling liquid outlet, the steam inlet is communicated with a steam outlet of the second turbine, the cooling liquid inlet is communicated with a low-temperature liquid outlet of the heat pump, and the cooling liquid outlet is communicated with a low-temperature liquid inlet of the heat pump.
As another aspect of the invention, a coking system is provided, which comprises a primary cooler, and is characterized in that the coking system also comprises a waste heat recovery system, the waste heat recovery system is the waste heat recovery system provided by the invention, a low-temperature liquid inlet of the heat pump is communicated with a liquid outlet of the primary cooler, and a low-temperature liquid outlet of the heat pump is communicated with a liquid inlet of the primary cooler.
Preferably, the coking system further comprises a refrigeration station, an outlet of the refrigeration station being in communication with the cryogenic liquid inlet of the heat pump, an inlet of the refrigeration station being in communication with the cryogenic liquid outlet of the heat pump.
Preferably, the coking system further comprises a final cooling tower, a liquid inlet of the final cooling tower is communicated with the low-temperature liquid outlet of the heat pump, and a liquid outlet of the final cooling tower is communicated with the low-temperature liquid inlet of the heat pump.
The waste heat recovery system provided by the invention can not only utilize the heat in the circulating water with higher temperature flowing out of the cooling device to generate electricity, but also utilize the liquid with reduced temperature after the electricity generation as a cold source to be reused as a cooling medium of the cooling device. The electricity generated by the waste heat of the circulating water can be used as process electricity, so that the energy consumption of the whole process is reduced by phase change.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the attached drawings the method comprises the following steps:
FIG. 1 is a schematic representation of the present invention a schematic diagram of a coking system.
<xnotran> </xnotran>
100: the heat pump 200: first power generation device
210: first turbine 220: second evaporator
230: first, the II condenser 240: preheater
250: first generator 260: working medium pump
300: primary cooler 400: final cooling tower
500: second power generation device 510: second turbine
520: third condenser 530: second generator
600: the condensed water tank 700: condensed water replenishing pump
800: the system circulation pump 900: steam source
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given by way of illustration and explanation only, not limitation.
As an aspect of the present invention, there is provided a waste heat recovery system, wherein, as shown in fig. 1, the waste heat recovery system includes a heat pump 100 and a first power generation device 200.
The heat pump 100 includes a first evaporator including a low temperature liquid inlet and a high temperature liquid outlet, and a first condenser including a high temperature liquid inlet and a low temperature liquid outlet.
The first power generation device 200 includes a heat source inlet and a cool source outlet, and the heat source inlet is communicated with the corresponding cool source outlet. The heat source inlet of the first power generation device 200 is communicated with the high temperature liquid outlet of the first evaporator to generate power by using heat of the liquid flowing out from the high temperature liquid outlet, and the cold source outlet is communicated with the high temperature liquid inlet of the heat pump, so that the liquid flowing into the first power generation device 200 through the heat source inlet can flow into the first condenser from the cold source outlet after the temperature of the liquid is reduced.
The waste heat recovery system provided by the invention is mainly used for recovering heat in circulating water. After the circulating liquid flows out of the cooling device, the temperature rises, and therefore, more heat is carried. The circulating water having a relatively high heat quantity enters the first evaporator of the heat pump 100 through the low-temperature liquid inlet. The heat pump 100 heats the liquid entering the first evaporator, and the heated liquid flows from the high-temperature liquid outlet of the first evaporator to the first power generation device 200, and the first power generation device 200 generates power by using the heat of the high-temperature liquid. The heat in the high-temperature liquid is used for generating electricity, and then the temperature is reduced to become low-temperature liquid. The cryogenic liquid may be used as a cold source liquid. After cold source liquid is introduced into a first condenser of the heat pump through a cold source inlet, the temperature of the cold source liquid is further reduced, and the cold source liquid flows out from a low-temperature liquid outlet of the first condenser.
And a cold source outlet of the first condenser is communicated with a liquid inlet of the cooling device, and the device needing cooling is cooled by using the low-temperature liquid flowing out of the low-temperature liquid of the first condenser.
Therefore, the waste heat recovery system provided by the invention can not only generate electricity by using the heat in the circulating water with high temperature flowing out from the cooling device, but also utilize the liquid with low temperature after generating electricity as a cold source to be reused as the cooling medium of the cooling device. The electricity generated by the waste heat of the circulating water can be used as process electricity, so that the energy consumption of the whole process is reduced by phase change.
It is easy to see that the waste heat recovery system belongs to a closed circulating system, and after the heat in the liquid with higher temperature is used for generating power and the temperature of the liquid is reduced, the heat is still used as a cooling medium in the cooling device, so the waste of the circulating liquid can be reduced by utilizing the waste heat recovery system provided by the invention.
The waste heat recovery system provided by the invention is preferably used in the field of coking. Specifically, the coking system includes a primary cooler 300, and the low-temperature liquid inlet of the heat pump 100 is communicated with the outlet of the primary cooler 300, and the low-temperature liquid outlet of the heat pump 100 is communicated with the inlet of the primary cooler 300.
Further, in the coking field, the height of the primary cooler 300 is about 30m, and the heat pump is disposed at the bottom of the primary cooler 300. The liquid flowing out of the outlet of the primary cooler 300 flows to the heat pump 100 from the height of 30m, and when the liquid reaches the first low-temperature liquid inlet, the liquid has high kinetic energy, so that the liquid can be used as part of power for circulating the liquid in the whole waste heat recovery system, the power required by the circulation of the fluid in the waste heat recovery system can be reduced, and the energy consumption is further reduced.
The water flowing out of the primary cooler 300 of the coking system still has a high temperature (about 43 c) and the amount of water flowing out of the primary cooler 300 is also very large, with considerable heat. After the waste heat recovery system provided by the invention recovers the heat therein, the recovered heat can be used for generating power and supplying power to a factory, so that the total energy consumption of a coke-oven plant can be reduced to a great extent.
In the present invention, the specific form of the heat pump 100 is not particularly limited, and the heat pump 100 may be a compression heat pump, an absorption heat pump, or an ejector heat pump, for example.
In the embodiment shown in fig. 1, the heat pump 100 is an absorption heat pump. The heating heat source of the absorption heat pump can be circulating ammonia water, steam or fuel gas.
As described above, the waste heat recovery system is mainly used for a coking system, and low-pressure saturated steam with a temperature of 150 ℃ of 0.4MPa to 0.6MPa is commonly used in a coking process, and thus, the heat pump 100 may use steam as a heating heat source in order to save energy. Accordingly, the heat pump 100 includes a heating steam inlet and a condensed water outlet, the heating steam inlet communicating with the condensed water outlet. The heating steam inlet is in communication with a steam source 900 for the introduction of steam for use as a heating heat source. After the steam enters the heat pump 100, heat is absorbed, the temperature is reduced, and the steam is condensed into liquid and flows out from a condensed water outlet.
Preferably, the waste heat recovery system further comprises a condensed water tank 600, the condensed water tank 600 is communicated with the condensed water outlet, and the condensed water tank 600 is communicated with the low-temperature liquid inlet of the heat pump. The water condensed by the steam can be used as circulating water for the waste heat recovery system, so that the water source is further saved.
As described above, in order to ensure that the condensed water condensed by the heating steam can smoothly flow to the low-temperature liquid inlet of the heat pump 100, it is preferable that the heat recovery system further includes a condensed water replenishing pump 700, an inlet of the condensed water replenishing pump 700 is communicated with the condensed water tank 600, and an outlet of the condensed water replenishing pump 700 is communicated with the first high-temperature liquid inlet of the heat pump 100.
The condensate make-up pump 700 may power the circulation of liquid between the heat pump 100 and the condensate tank 600.
In the present invention, the specific structure of the first power generation device 200 is not particularly limited, and preferably, the first power generation device 200 includes a second evaporator 220, a second condenser 230, a first turbine 210, and a first power generator 250. The heat source inlet includes a first heat source inlet, and the cool source outlet includes a first cool source outlet.
The second evaporator 220 includes a first power generation substance outlet and a first power generation substance inlet, and the second evaporator 220 is configured to receive power generation substance flowing into the second evaporator 220 through the first power generation substance inlet. The first heat source inlet and the first cold source outlet are formed on the second evaporator 220, the first heat source inlet is communicated with the first cold source outlet, so that the power generation working medium is heated by the liquid flowing into the second evaporator through the first heat source inlet, and the liquid flowing into the second evaporator 220 through the first heat source inlet can flow out through the first cold source outlet. The first generator material outlet is communicated with a steam inlet of a first turbine 210, and the first turbine 210 is used for driving a first generator 250 to generate electricity.
Specifically, the high-temperature liquid flowing out of the heat pump 100 heats the power generation working medium in the second evaporator 220, so that the power generation working medium is vaporized and flows into the first turbine, and the first turbine is pushed to rotate. The first turbine 210 rotates the first generator 250 so that the first generator 250 can generate electricity.
In the present invention, the specific structure of the first turbine 210 is not particularly limited, and for example, the first turbine 210 may be any one of a steam turbine, a screw expander, and a radial inflow turbine.
The second condenser 230 includes a second power generation working medium inlet and a second power generation working medium outlet which are communicated with each other, the second power generation working medium inlet is communicated with the steam outlet of the first turbine 210 to cool and condense the power generation working medium flowing out of the first turbine, so as to obtain a liquid power generation working medium, and the liquid power generation working medium can flow out of the second condenser through the second power generation working medium outlet and reach the first power generation working medium inlet of the second evaporator 220.
The first Power Generation device used in the heat recovery system shown in fig. 1 is an Organic Rankine Power Generation (ORC). When the high-temperature liquid flows into the second evaporator 220, the heat in the high-temperature liquid is absorbed by the power generation working medium in the second evaporator 220, so that the power generation working medium is vaporized. The gaseous power generation working medium enters the first turbine 210, pushes the first turbine 210 to rotate, and drives the first generator 250 to generate power.
In order to save the power generation working medium, the first power generation device 200 may be configured such that the power generation working medium performs a closed cycle therein. That is, the power generation fluid exiting first turbine 210 may be recycled back to second evaporator 220.
Preferably, the first power generation device 200 may further include a preheater 240 and a working fluid pump 260.
The preheater 240 includes a third power generation working medium inlet and a third power generation working medium outlet which are communicated with each other, the third power generation working medium inlet is communicated with the second power generation working medium outlet, and the third power generation working medium outlet is communicated with the first power generation working medium inlet. The preheater 240 is used to preheat the power generation medium flowing into the preheater 240 through the third power generation medium inlet. The power generation working medium flows into the second evaporator 220 after being preheated by the preheater 240, so that the power generation working medium entering the second evaporator 220 has a certain temperature, the power generation working medium can be vaporized more thoroughly, and the power generation efficiency is improved.
The inlet of the working medium pump 260 is communicated with the second power generation working medium outlet, and the outlet of the working medium pump 260 is communicated with the third power generation working medium inlet. The working medium pump 260 is used for realizing that the power generation working medium circulates among the preheater 240, the second evaporator 220 and the second condenser 230 of the first power generation device.
As described above, the preheater 240 is used to heat the power generation fluid. Therefore, in the present invention, there is no particular limitation on how the preheater 240 heats the power generation working medium. For example, the high temperature liquid obtained in heat pump 100 may be introduced into preheater 240 to heat the power generating working fluid. Specifically, the heat source inlet includes a second heat source inlet and the cool source outlet includes a second cool source outlet, and the second heat source inlet and the second cool source outlet are formed on the preheater 240. The second heat source inlet is communicated with the high-temperature liquid outlet of the first evaporator, the second cold source outlet is communicated with the high-temperature liquid inlet of the first evaporator, and the liquid flowing into the preheater 240 through the second heat source inlet can flow out through the second cold source outlet.
The high-temperature liquid obtained in the heat pump 100 is introduced into the preheater 240 through the second heat source inlet, and it should be noted that the power generation working fluid and the high-temperature liquid introduced into the preheater 240 are not mixed with each other. That is to say, the second heat source inlet and the third power generation working medium inlet are not communicated with each other.
After the high-temperature liquid flows through the preheater 240, the heat is absorbed by the power generation working medium in the preheater, the temperature is reduced, the heat flows out from the second cold source outlet, flows into the heat pump 100 through the first cold source inlet, and can be used as the cooling liquid of the cooling circulation device after being cooled by the first condenser in the heat pump 100.
In order to ensure that the fluid in the waste heat recovery system provided by the invention can be smoothly circulated, preferably, the first and second electrodes are formed of a metal, the waste heat recovery system further comprises a system circulating pump 800, and an inlet of the system circulating pump 800 is communicated with the low-temperature liquid outlet.
As described above, when the heat recovery system is used in a coking system, the cooling circulation device is the primary cooler 300, and the primary cooler 300 has a height of 30m, so that the system circulation pump 800 provides less power to ensure that the liquid circulates in the heat recovery system.
In order to further reduce the energy consumption of the coking system and recover and utilize the waste heat of the coking system, the waste heat recovery system preferably further comprises a second power generation device 500 comprising a second turbine 510, a second generator 530 and a third condenser 520. The third condenser 520 includes a vapor inlet communicating with the vapor outlet of the second turbine 510, a coolant inlet communicating with the low-temperature liquid outlet of the heat pump 100, and a coolant outlet communicating with the low-temperature liquid inlet of the heat pump 100.
In the present invention, the second power generation device 500 is a CDQ power generation device for recovering waste heat in the dry quenching system. In the present invention, the third condenser 520 is cooled by the low-temperature liquid generated by the heat pump 100, and the condensed water obtained in the third condenser 520 may be supplemented to the primary cooler. The liquid having the increased temperature after cooling third condenser 520 may flow into heat pump 100 to generate power by waste heat.
Also, in the present invention, the specific structure of the second turbine 510 is not particularly limited, and for example, the second turbine 510 may be any one of a steam turbine, a screw expander, and a radial inflow turbine.
As another aspect of the present invention, a coking system is provided, as shown in fig. 1, the coking system includes a primary cooler 300, wherein the coking system further includes a waste heat recovery system, the waste heat recovery system is the above-mentioned waste heat recovery system provided in the present invention, a low-temperature liquid inlet of the heat pump 100 is communicated with a liquid outlet of the primary cooler 300, and a low-temperature liquid outlet of the heat pump 100 is communicated with a liquid inlet of the primary cooler 300.
As described above, the waste heat recovery system according to the present invention can generate power by using heat in the high-temperature circulating water flowing out from the cooling device, and can reuse the liquid having a reduced temperature after power generation as a cooling source as a cooling medium for the cooling device. The electricity generated by the waste heat of the circulating water can be used as process electricity, so that the energy consumption of the whole process is reduced by phase change.
It is easy to see that the waste heat recovery system belongs to a closed circulation system, and the heat in the liquid with higher temperature is used as the cooling medium in the cooling device after the temperature is reduced due to the power generation, so the waste of the circulation liquid can be reduced by using the waste heat recovery system provided by the invention.
As described above, in order to promote the liquid circulation in the coking system, the waste heat recovery system may preferably include the system circulation pump 800, and in this embodiment, the low-temperature liquid outlet of the heat pump 100 is communicated with the liquid inlet of the primary cooler through the system circulation pump 800. Specifically, the low-temperature liquid outlet of the heat pump 100 is communicated with the inlet of the system circulation pump 800, and the outlet of the system circulation pump 800 is communicated with the liquid inlet of the primary cooler.
In addition to the primary cooler 300, the coking system includes other means for circulating cooling water.
Preferably, the coking system further comprises a refrigeration station 1000, an outlet of the refrigeration station 1000 being in communication with the cryogenic liquid inlet of the heat pump 100, an inlet of the refrigeration station 100 being in communication with the cryogenic liquid outlet of the heat pump 100. In a coking system, a refrigeration station 1000 is used for cooling the chemical production section. In the invention, the low-temperature liquid generated by the heat pump 100 can be used for cooling the chemical production section, so that the arrangement of a cooling device is reduced, and the cost is reduced.
Preferably, the coking system further comprises a final cooling tower 400, wherein a liquid inlet of the final cooling tower 400 is communicated with a low-temperature liquid outlet of the heat pump 100, and a liquid outlet of the final cooling tower 400 is communicated with a low-temperature liquid inlet of the heat pump 100. Likewise, the cryogenic liquid produced using the heat pump may also be used as the cooling liquid for the final cooling tower 400.
Taking the coking system of annual dry whole coke 140 ten thousand t/a as an example, the liquid provided by the primary cooler 300, the final cooling tower 400, the refrigeration station 1000 and the third condenser 520 to the heat pump 100 is about 43 ℃, therefore, the waste heat recovery system provided by the invention can recover about 8300X 10 4 The kcal/h heat is used for heating or generating electricity. Meanwhile, the temperature of the low-temperature liquid flowing out of the low-temperature liquid outlet of the heat pump 100 is about 32 ℃, and it can be used as a cooling source for the primary cooler 300, the final cooling tower 400, the refrigerating station 1000, and the third condenser 520. Therefore, when the waste heat recovery system provided by the invention is adopted to carry out waste heat recovery power generation, the existing chemical product circulating cooling water system, refrigeration circulating cooling water system and power generation circulating cooling water system can be eliminated, and about 240m can be saved 3 Make up water per hour. Meanwhile, for a coking system, energy is greatly saved, and cost is reduced.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that the present invention can be practiced without departing from the spirit and scope of the invention, various modifications and improvements may be made, and are considered within the scope of the invention.

Claims (12)

1. The waste heat recovery system is characterized by comprising a heat pump and a first power generation device, wherein the heat pump comprises a first evaporator and a first condenser, the first evaporator comprises a low-temperature liquid inlet and a high-temperature liquid outlet, the first condenser comprises a high-temperature liquid inlet and a low-temperature liquid outlet, the first power generation device comprises a heat source inlet and a cold source outlet, the heat source inlet is communicated with a corresponding cold source outlet, the heat source inlet of the first power generation device is communicated with the high-temperature liquid outlet of the first evaporator so as to generate power by utilizing heat of liquid flowing out of the high-temperature liquid outlet, the cold source outlet is communicated with the high-temperature liquid inlet of the heat pump, and the liquid flowing into the first power generation device through the heat source inlet can flow into the first condenser from the cold source outlet after the temperature of the liquid is reduced.
2. The waste heat recovery system according to claim 1, wherein the heat pump comprises a heating steam inlet and a condensed water outlet, the heating steam inlet is communicated with the condensed water outlet, the heating steam inlet is used for introducing steam for heating, and the steam is condensed into a liquid state and then flows out of the condensed water outlet.
3. The heat recovery system of claim 2 further comprising a condensate tank in communication with the condensate outlet and in communication with the low temperature liquid inlet of the heat pump.
4. The heat recovery system of claim 3, further comprising a condensate make-up pump, an inlet of the condensate make-up pump being in communication with the condensate tank, and an outlet of the condensate make-up pump being in communication with a cryogenic liquid inlet of the heat pump.
5. A waste heat recovery system according to any one of claims 1-4, characterized in that the first generator comprises a second evaporator, a second condenser, a first turbine and a first generator, the heat source inlet comprises a first heat source inlet, the cold source outlet comprises a first cold source outlet,
the second evaporator further comprises a first power generation substance outlet and a first power generation substance inlet, the second evaporator is used for accommodating power generation working medium flowing into the second evaporator through the first power generation substance inlet, the first heat source inlet and the first cold source outlet are formed on the first evaporator, the first heat source inlet is communicated with the first cold source outlet so as to heat the power generation working medium by using liquid flowing into the second evaporator through the first heat source inlet, the liquid flowing into the second evaporator through the first heat source inlet can flow out through the first cold source outlet, and the first power generation substance outlet is communicated with the steam inlet of the first turbine;
the first turbine is used for driving the generator to generate electricity;
the second condenser comprises a second power generation working medium inlet and a second power generation working medium outlet which are communicated with each other, the second power generation working medium inlet is communicated with the steam outlet of the first turbine so as to cool and condense the power generation working medium flowing out of the first turbine, and liquid power generation working medium is obtained and can flow out of the second condenser through the second power generation working medium outlet and reach the first power generation working medium inlet of the second evaporator.
6. A heat recovery system in accordance with claim 5, wherein the first power generation device further comprises a preheater and a working fluid pump,
the preheater comprises a third power generation working medium inlet and a third power generation working medium outlet which are communicated with each other, the third power generation working medium inlet is communicated with the second power generation working medium outlet, the third power generation working medium outlet is communicated with the first power generation working medium inlet, and the preheater is used for preheating the power generation working medium flowing into the preheater through the third power generation working medium inlet;
and the inlet of the working medium pump is communicated with the second power generation working medium outlet, and the outlet of the working medium pump is communicated with the third power generation working medium inlet.
7. The heat recovery system of claim 6, wherein the heat source inlet comprises a second heat source inlet, the cold source outlet comprises a second cold source outlet, the second heat source inlet and the second cold source outlet are both formed on the preheater, the second heat source inlet is communicated with the second cold source outlet, the second heat source inlet is communicated with the high-temperature liquid outlet of the first evaporator, the second cold source outlet is communicated with the high-temperature liquid inlet of the first condenser, and the liquid flowing into the preheater through the second heat source inlet can flow out through the second cold source outlet.
8. A waste heat recovery system according to any one of claims 1-4, further comprising a system circulation pump, an inlet of the system circulation pump being in communication with the cryogenic liquid outlet.
9. The heat recovery system of any one of claims 1 to 4, further comprising a second power generation device comprising a second turbine, a second generator and a third condenser, the third condenser comprising a steam inlet, a coolant inlet and a coolant outlet, the steam inlet being in communication with a steam outlet of the second turbine, the coolant inlet being in communication with a cryogenic liquid outlet of the heat pump, the coolant outlet being in communication with a cryogenic liquid inlet of the heat pump.
10. A coking system, coking system includes the primary cooler, its characterized in that, coking system still includes waste heat recovery system, waste heat recovery system be any one of claims 1 to 9 waste heat recovery system, the cryogenic liquid entry of heat pump with the liquid outlet intercommunication of primary cooler, the cryogenic liquid export of heat pump with the income liquid mouth intercommunication of primary cooler.
11. The coking system of claim 10 further comprising a refrigeration station, an outlet of the refrigeration station being in communication with the cryogenic liquid inlet of the heat pump, an inlet of the refrigeration station being in communication with the cryogenic liquid outlet of the heat pump.
12. The coking system of claim 10 or 11 further comprising an end cooling tower, a liquid inlet of the end cooling tower being in communication with the cryogenic liquid outlet of the heat pump, and a liquid outlet of the end cooling tower being in communication with the cryogenic liquid inlet of the heat pump.
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