CN110173347B - Waste heat recycling system of coal mine in-use equipment and operation method - Google Patents

Waste heat recycling system of coal mine in-use equipment and operation method Download PDF

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Publication number
CN110173347B
CN110173347B CN201910453148.3A CN201910453148A CN110173347B CN 110173347 B CN110173347 B CN 110173347B CN 201910453148 A CN201910453148 A CN 201910453148A CN 110173347 B CN110173347 B CN 110173347B
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water
valve
heat exchanger
temperature
heat
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CN110173347A (en
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何勇
陈菁
周航
于涛
吴宇
李科
刘峰川
邓勉
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Changzhi City Yiyang Energy Technology Co Ltd
ZHEJIANG YIYANG ENERGY TECHNOLOGY CO LTD
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Changzhi City Yiyang Energy Technology Co Ltd
ZHEJIANG YIYANG ENERGY TECHNOLOGY CO LTD
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/08—Adaptations for driving, or combinations with, pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
    • F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
    • F02B63/042—Rotating electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
    • F02G5/02—Profiting from waste heat of exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • F22B1/1807—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
    • 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
    • F25B30/00—Heat pumps
    • F25B30/04—Heat pumps of the sorption type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
    • F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
    • F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
    • F02B2043/103—Natural gas, e.g. methane or LNG used as a fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2260/00—Recuperating heat from exhaust gases of combustion engines and heat from cooling circuits
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The invention discloses a waste heat recycling system of coal mine in-use equipment and an operation method, which are characterized by comprising the following steps: the system comprises an internal combustion engine set, a generator set, a ventilation cooling device, a water-water heat exchanger, a waste heat boiler, a steam turbine set, a condenser, a cooling tower, a first air compressor, a second air compressor, a motor, a smoke absorption heat pump, a smoke heat exchanger, a hot water storage tank and a chimney. The invention recycles the waste heat of the exhaust smoke of the waste heat boiler, the high-temperature compressed air of the air compressor, the waste heat of the high-temperature cylinder sleeve water of the internal combustion engine and the waste heat of the low-temperature circulating water of the steam turbine in a gradient manner, improves the energy utilization efficiency of the whole system of the coal mine and meets the different energy requirements of the coal mine.

Description

Waste heat recycling system of coal mine in-use equipment and operation method
Technical Field
The invention belongs to the field of coal mine gas utilization and waste heat recycling, and particularly relates to a waste heat recycling system and an operation method of coal mine in-use equipment.
Background
Gas is the second only of the main greenhouse gas of carbon dioxide, and the greenhouse effect produced by unit mass of gas is equivalent to 21 times of that of the same mass of carbon dioxide. In coal mining, a large amount of gas is often associated at the same time, which is one of main gas industrial emission sources, so that the gas emission of a coal mine is reduced, and the emission of greenhouse gas can be effectively reduced. Meanwhile, the main component of coal mine gas is methane, which is a high-quality clean gas energy source.
China is a big energy consumption country, the energy yield of China in 2017 is 359000 ten thousand tons of standard coal, wherein the proportion of natural gas yield in total energy yield is continuously increased, and the natural gas yield is increased from 4.4% in 2013 to 5.4% in 2017. In recent years, the absolute amount of coal mine gas which is not utilized in China also tends to increase year by year, and the total amount is huge. If the gas with different concentrations in the coal mine production process is collected and utilized, the coal mine gas accident can be effectively solved, the production living conditions of a mining area are improved, the increase of clean energy supply and the reduction of greenhouse gas emission are facilitated, and the multiple targets of life protection, resource saving and environment protection are achieved.
The usage amount of air compressors and internal combustion engines in coal mines in China is very large, 65% -85% of energy consumption in the operation process of a unit is converted into heat to be discharged into air, and a large amount of energy is wasted. If not effectively controlled in a timely manner, this heat can cause serious damage to the machinery. The invention provides a waste heat recycling system and an operation method of coal mine in-use equipment, which aim to improve the energy utilization rate of a coal mine air compressor, an internal combustion engine and a steam turbine, reduce environmental pollution and protect the operation safety of mechanical equipment.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a waste heat recycling system and an operation method of coal mine in-use equipment, which are reasonable in design and reliable in performance.
The technical scheme adopted by the invention for solving the problems is as follows: a waste heat recycling system of coal mine in-use equipment and an operation method are characterized by comprising the following steps: the system comprises an internal combustion engine set, a generator set, a ventilation cooling device, a water-water heat exchanger, a waste heat boiler, a turbine set, a condenser, a cooling tower, a first air compressor, a second air compressor, a first gas-water heat exchanger, a second gas-water heat exchanger, a motor, a smoke absorption heat pump, a smoke heat exchanger, a hot water storage tank and a chimney, wherein a gas inlet of the internal combustion engine set is connected with coal mine gas, the internal combustion engine set drives the generator set to generate electricity, a cylinder liner water outlet of the internal combustion engine set is simultaneously connected with a water inlet of the ventilation cooling device and a high-temperature water inlet of the water-water heat exchanger, a second valve and a third valve are respectively installed at the water inlet of the ventilation cooling device and the high-temperature water inlet of the water-water heat exchanger, a cylinder liner water inlet of the internal combustion engine set is simultaneously connected with a water outlet of the ventilation cooling device and a high-temperature water, the exhaust gas outlet of the internal combustion engine is connected with the exhaust gas inlet of the waste heat boiler, the steam outlet of the waste heat boiler is connected with the steam inlet of the steam turbine unit, the steam outlet of the steam turbine unit is connected with the exhaust steam inlet of the condenser, the condensed water outlet of the condenser is connected with the water supply inlet of the waste heat boiler, the circulating water outlet of the condenser is simultaneously connected with the water inlet of the cooling tower and the low-temperature water inlet of the flue gas type absorption heat pump, a fifth valve and a seventh valve are respectively installed at the water inlet of the cooling tower and the low-temperature water inlet of the flue gas type absorption heat pump, the circulating water inlet of the condenser is simultaneously connected with the water outlet of the cooling tower and the low-temperature water outlet of the flue gas type absorption heat pump, a sixth valve and an eighth valve are respectively installed at the water outlet of the cooling tower and the low-temperature water outlet of the flue gas type absorption heat pump, the, the air inlet of the first air compressor is connected with fresh air, the air outlet of the first air compressor is connected with the air inlet of the first air-water heat exchanger, the motor drives the second air compressor to do work, the air inlet of the second air compressor is connected with fresh air, the air outlet of the second air compressor is connected with the air inlet of the second air-water heat exchanger, the low-temperature water inlet of the water-water heat exchanger is connected with the water outlet end of the heat supply water feeding pipe, a fifteenth valve is arranged at the low-temperature water inlet of the water-water heat exchanger, the low-temperature water outlet of the water-water heat exchanger is connected with the water inlet end of the hot water supply communicating pipe, a sixteenth valve is arranged at the low-temperature water outlet of the water-water heat exchanger, the low-temperature water inlet of the first air-water heat exchanger is connected with the water outlet end of the heat supply water feeding pipe, an eleventh valve is, and a twelfth valve is installed at the low-temperature water outlet of the first gas-water heat exchanger, the low-temperature water inlet of the second gas-water heat exchanger is connected with the water outlet end of the heat supply water feeding pipe, a thirteenth valve is installed at the low-temperature water inlet of the second gas-water heat exchanger, the low-temperature water outlet of the second gas-water heat exchanger is connected with the water inlet end of the heat supply water feeding pipe, a ninth valve is installed at the medium-temperature water inlet of the flue gas absorption heat pump, the medium-temperature water outlet of the flue gas absorption heat pump is connected with the water inlet end of the hot supply water feeding pipe, a tenth valve is installed at the medium-temperature water outlet of the flue gas absorption heat pump, the driving flue gas inlet of the flue gas absorption heat pump is connected with the flue gas outlet of the waste heat boiler, a twenty-first valve is arranged at a driving smoke inlet of the smoke absorption heat pump, a driving smoke outlet of the smoke absorption heat pump is connected with a smoke inlet of the chimney, a twenty-second valve is arranged at a driving smoke outlet of the smoke absorption heat pump, a water inlet of the hot water storage tank is connected with a water outlet end of the hot water supply communicating pipe, a seventeenth valve is arranged at a water inlet of the hot water storage tank, a water outlet of the hot water storage tank is connected with a water inlet end of a domestic hot water supply pipe, a nineteenth valve is arranged at a water outlet of the hot water storage tank, a water inlet of the smoke heat exchanger is connected with a water outlet end of the hot water supply communicating pipe, an eighteenth valve is arranged at a water inlet of the smoke heat exchanger, a water outlet of the smoke heat exchanger is connected with a water inlet end of a heating water supply pipe, and the twenti, the flue gas inlet of the flue gas heat exchanger is connected with the flue gas outlet of the waste heat boiler, a twenty-third valve is installed at the flue gas inlet of the flue gas heat exchanger, the flue gas outlet of the flue gas heat exchanger is connected with the flue gas inlet of the chimney, and a twenty-fourth valve is installed at the flue gas outlet of the flue gas heat exchanger.
Furthermore, the high-temperature cylinder liner water side of the internal combustion engine unit is connected with the ventilation cooling device and the water-water heat exchanger, so that the cylinder liner water can be cooled in a mode of radiating and discharging the outside, and the cylinder liner water can be cooled in a mode of recovering waste heat and supplying heat.
Furthermore, the waste heat boiler is connected with the smoke absorption heat pump and the smoke heat exchanger simultaneously, and can provide a driving heat source for the smoke absorption heat pump and a heating heat source for coal mine users.
Furthermore, the low-temperature circulating water side of the condenser is connected with the smoke absorption heat pump and the cooling tower, so that the low-temperature circulating water can be cooled in a mode of external heat dissipation and discharge, and the low-temperature circulating water can be cooled in a mode of waste heat recovery and heat supply.
Further, the water-water heat exchanger, the first gas-water heat exchanger, the second gas-water heat exchanger and the smoke absorption heat pump are connected in parallel, and the water-water heat exchanger, the first gas-water heat exchanger, the second gas-water heat exchanger and the smoke absorption heat pump are used for simultaneously heating low-temperature hot water from a heat supply water supply pipe for the first time.
Further, the hot water storage tank is connected with the water-water heat exchanger, the first air-water heat exchanger, the second air-water heat exchanger and the smoke absorption heat pump through the hot water supply communicating pipe, and domestic hot water is provided for coal mine users by recycling high-temperature cylinder sleeve water waste heat of the internal combustion engine set, high-temperature compressed air waste heat of the first air compressor, high-temperature compressed air waste heat of the second air compressor and low-temperature circulating water waste heat of the condenser.
Furthermore, the flue gas heat exchanger is simultaneously connected with the water-water heat exchanger, the first gas-water heat exchanger, the second gas-water heat exchanger and the flue gas type absorption heat pump through the hot water supply communicating pipe, low-temperature hot water from the heat supply water supply pipe is heated for the first time and then is conveyed to the flue gas heat exchanger, and the low-temperature hot water is heated for the second time and then is output by the heating water supply pipe to supply heat for coal mine users.
The operation method of the waste heat recovery system of the coal mine equipment is characterized by comprising the following steps:
coal mine gas enters an internal combustion engine set to perform combustion and do work to drive a generator set to generate power, at the moment, a first valve and a second valve are closed, a third valve, a fourth valve, a fifteenth valve and a sixteenth valve are opened, high-temperature flue gas formed by the internal combustion engine set enters a waste heat boiler, high-temperature cylinder liner water formed by the internal combustion engine set enters a water-water heat exchanger to heat low-temperature hot water from a heat supply water supply pipe, and cooled cylinder liner water returns to the internal combustion engine set to cool the internal combustion engine set so as to form a cycle;
the electric energy generated by the generator set is used for driving the motor to do work to drive the second air compressor to compress fresh air, at the moment, the thirteenth valve and the fourteenth valve are opened, high-temperature and high-pressure air formed by the second air compressor enters the second air-water heat exchanger, and low-temperature hot water from the heat supply water supply pipe is heated;
steam generated by the waste heat boiler enters a steam turbine set to do work to drive a first air compressor to compress fresh air, exhaust steam of the steam turbine set enters a condenser to be condensed to form condensed water and then returns to the waste heat boiler to form a cycle, at the moment, an eleventh valve and a twelfth valve are opened, high-temperature and high-pressure air formed by the first air compressor enters a first air-water heat exchanger to heat low-temperature hot water from a heat supply water supply pipe;
closing the fifth valve and the sixth valve, opening the seventh valve, the eighth valve, the ninth valve, the tenth valve, the eleventh valve and the twelfth valve, enabling high-temperature flue gas output by the waste heat boiler to enter a flue gas type absorption heat pump to serve as a driving heat source, and enabling low-temperature circulating water output by a condenser to serve as a low-temperature heat source to heat low-temperature hot water from a heat supply water supply pipe;
opening the seventeenth valve and the nineteenth valve, feeding low-temperature hot water simultaneously heated by the water-water heat exchanger, the first air-water heat exchanger, the second air-water heat exchanger and the smoke absorption heat pump into a hot water storage tank through a hot water supply communicating pipe, and providing domestic hot water for coal mine users through a domestic hot water supply pipe, wherein at the moment, the fluctuation of the domestic hot water demand load is buffered by using the hot water storage tank;
and opening the eighteenth valve, the twentieth valve, the twenty-third valve and the twenty-fourth valve, feeding low-temperature hot water which is simultaneously heated by the water-water heat exchanger, the first gas-water heat exchanger, the second gas-water heat exchanger and the smoke absorption heat pump into the smoke heat exchanger through the hot water supply communicating pipe, heating the low-temperature hot water for the second time by using high-temperature smoke output by the waste heat boiler, and outputting the high-temperature smoke for heating coal mine users through the heating water supply pipe.
In the waste heat recycling system and the operation method of the coal mine in-use equipment, the waste heat recycling system comprises the following steps:
in non-heating seasons, coal mine users have no heating requirement, at the moment, the eighteenth valve, the twentieth valve, the twenty-third valve and the twenty-fourth valve need to be closed, low-temperature hot water which is simultaneously heated by the water-water heat exchanger, the first gas-water heat exchanger, the second gas-water heat exchanger and the smoke absorption heat pump does not enter the smoke heat exchanger any longer, but all of the low-temperature hot water enters the hot water storage tank, and then the domestic hot water is provided for the coal mine users through the domestic hot water supply pipe.
In the operation method of the waste heat recycling system of the coal mine in-use equipment, the following steps are performed:
the water-water heat exchanger, the first gas-water heat exchanger, the second gas-water heat exchanger and the smoke absorption heat pump all operate independently;
at the moment, the first valve and the second valve are opened, the third valve, the fourth valve, the fifteenth valve and the sixteenth valve are closed, and the high-temperature cylinder liner water formed by the internal combustion engine set does not enter the water-water heat exchanger to heat low-temperature hot water, but enters the ventilation cooling device to be cooled by utilizing a mode of external heat dissipation and discharge;
at the moment, opening a fifth valve and a sixth valve, closing a seventh valve, an eighth valve, a ninth valve, a tenth valve, an eleventh valve and a twelfth valve, and cooling the low-temperature circulating water heated in the condenser by a mode of discharging external heat radiation instead of entering the flue gas type absorption heat pump;
at the moment, the eleventh valve and the twelfth valve are closed, and the first gas-water heat exchanger is not used for heating low-temperature hot water from a heat supply water supply pipe;
at the moment, the thirteenth valve and the fourteenth valve are closed, and the second gas-water heat exchanger is not used for heating low-temperature hot water from the heat supply water supply pipe.
Compared with the prior art, the invention has the following advantages and effects: reasonable in design, simple structure, the dependable performance, reasonable design colliery is in service waste heat recovery utilizes system and the operation method of equipment to realize: the requirement of various energy uses of the colliery is used, use "temperature to the mouth, the cascade utilizes" as the principle, cascade recycle exhaust-heat boiler's the waste heat of discharging fume, the high temperature compressed air of air compressor machine, the high temperature cylinder liner water waste heat of internal-combustion engine and the low temperature circulating water waste heat of steam turbine, the energy utilization efficiency of the whole system in colliery has been improved, both satisfied the colliery to the demand of different energy uses, the irreversible loss in the energy recovery utilizes the in-process has been reduced again, the efficiency level of system has further been improved, when effectively reducing environmental pollution, the mechanical equipment operation safety has been protected. Therefore, the invention has great practical application value.
Drawings
Fig. 1 is a schematic structural diagram of a waste heat recovery system of a coal mine in-use device in an embodiment of the invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1, the waste heat recovery and utilization system of the coal mine in-use equipment in the embodiment includes an internal combustion engine unit 1, a generator unit 2, a ventilation cooling device 3, a water-water heat exchanger 4, a waste heat boiler 5, a turbine unit 6, a condenser 7, a cooling tower 8, a first air compressor 9, a second air compressor 10, a first air-water heat exchanger 11, a second air-water heat exchanger 12, a motor 13, a flue gas type absorption heat pump 14, a flue gas heat exchanger 15, a hot water storage tank 16 and a chimney 17.
The air inlet of the internal combustion engine set 1 in the embodiment is connected with coal mine gas 101, the internal combustion engine set 1 drives the generator set 2 to generate electricity, the cylinder liner water outlet of the internal combustion engine set 1 is simultaneously connected with the water inlet of the ventilation cooling device 3 and the high-temperature water inlet of the water-water heat exchanger 4, a second valve 22 and a third valve 23 are respectively installed at the water inlet of the ventilation cooling device 3 and the high-temperature water inlet of the water-water heat exchanger 4, the cylinder liner water inlet of the internal combustion engine set 1 is simultaneously connected with the water outlet of the ventilation cooling device 3 and the high-temperature water outlet of the water-water heat exchanger 4, a first valve 21 and a fourth valve 24 are respectively installed at the water outlet of the ventilation cooling device 3 and the high-temperature water outlet of the water-water heat exchanger 4.
In this embodiment, the steam outlet of the exhaust-heat boiler 5 is connected to the steam inlet of the steam turbine unit 6, the steam outlet of the steam turbine unit 6 is connected to the exhaust steam inlet of the condenser 7, the condensed water outlet of the condenser 7 is connected to the water supply inlet of the exhaust-heat boiler 5, the circulating water outlet of the condenser 7 is connected to the water inlet of the cooling tower 8 and the low-temperature water inlet of the flue gas absorption heat pump 14, the fifth valve 25 and the seventh valve 27 are respectively installed at the water inlet of the cooling tower 8 and the low-temperature water inlet of the flue gas absorption heat pump 14, the circulating water inlet of the condenser 7 is connected to the water outlet of the cooling tower 8 and the low-temperature water outlet of the flue gas absorption heat pump 14, the sixth valve 26 and the eighth valve 28 are respectively installed at the water outlet of the cooling tower 8 and the low-temperature water outlet of the flue gas absorption heat pump 14, the steam turbine unit 6 drives the first air compressor 9, the air inlet of the first air compressor 9 is connected with fresh air 102, and the air outlet of the first air compressor 9 is connected with the air inlet of the first air-water heat exchanger 11.
In this embodiment, the motor 13 drives the second air compressor 10 to do work, the air inlet of the second air compressor 10 is connected with fresh air 102, the air outlet of the second air compressor 10 is connected with the air inlet of the second air-water heat exchanger 12, the low-temperature water inlet of the water-water heat exchanger 4 is connected with the water outlet of the heat supply water feed pipe 103, the low-temperature water inlet of the water-water heat exchanger 4 is provided with a fifteenth valve 35, the low-temperature water outlet of the water-water heat exchanger 4 is connected with the water inlet of the hot water supply communicating pipe 106, the low-temperature water outlet of the water-water heat exchanger 4 is provided with a sixteenth valve 36, the low-temperature water inlet of the first air-water heat exchanger 11 is connected with the water outlet of the heat supply water feed pipe 103, the low-temperature water inlet of the first air-water heat exchanger 11 is provided with an eleventh valve 31, the low-temperature water outlet of the first, the low-temperature water inlet of the second gas-water heat exchanger 12 is connected with the water outlet end of the heat supply water supply pipe 103, the thirteenth valve 33 is installed at the low-temperature water inlet of the second gas-water heat exchanger 12, the low-temperature water outlet of the second gas-water heat exchanger 12 is connected with the water inlet end of the hot water supply communicating pipe 106, and the fourteenth valve 34 is installed at the low-temperature water outlet of the second gas-water heat exchanger 12.
In this embodiment, the medium temperature water inlet of the flue gas absorption heat pump 14 is connected to the water outlet end of the heat supply water supply pipe 103, the ninth valve 29 is installed at the medium temperature water inlet of the flue gas absorption heat pump 14, the medium temperature water outlet of the flue gas absorption heat pump 14 is connected to the water inlet end of the heat supply water communication pipe 106, the tenth valve 30 is installed at the medium temperature water outlet of the flue gas absorption heat pump 14, the driving flue gas inlet of the flue gas absorption heat pump 14 is connected to the flue gas outlet of the exhaust-heat boiler 5, the twenty-first valve 41 is installed at the driving flue gas inlet of the flue gas absorption heat pump 14, the driving flue gas outlet of the flue gas absorption heat pump 14 is connected to the flue gas inlet of the chimney 17, the twenty-second valve 42 is installed at the driving flue gas outlet of the flue gas absorption heat pump 14, the water inlet of the hot water storage tank 16 is connected to, and a seventeenth valve 37 is installed at the water inlet of the hot water storage tank 16, the water outlet of the hot water storage tank 16 is connected with the water inlet end of the domestic hot water supply pipe 104, and a nineteenth valve 39 is installed at the water outlet of the hot water storage tank 16.
The water inlet of the flue gas heat exchanger 15 in this embodiment is connected with the water outlet end of the hot water supply communicating pipe 106, and the eighteenth valve 38 is installed at the water inlet of the flue gas heat exchanger 15, the water outlet of the flue gas heat exchanger 15 is connected with the water inlet end of the heating water supply pipe 105, and the twentieth valve 40 is installed at the water outlet of the flue gas heat exchanger 15, the flue gas inlet of the flue gas heat exchanger 15 is connected with the flue gas outlet of the waste heat boiler 5, and the twentieth valve 43 is installed at the flue gas inlet of the flue gas heat exchanger 15, the flue gas outlet of the flue gas heat exchanger 15 is connected with the flue gas inlet of the chimney 17, and the twenty-.
In this embodiment, the high-temperature cylinder liner water side of the internal combustion engine unit 1 is connected to the ventilation cooling device 3 and the water-water heat exchanger 4, and the low-temperature circulating water side of the condenser 7 is connected to the flue gas absorption heat pump 14 and the cooling tower 8, so that the cylinder liner water and the low-temperature circulating water can be cooled by means of external heat dissipation and discharge, and the cylinder liner water and the low-temperature circulating water can be cooled by means of waste heat recovery and heat supply.
In this embodiment, the exhaust-heat boiler 5 is connected to the flue gas type absorption heat pump 14 and the flue gas heat exchanger 15 at the same time, and can provide a driving heat source for the flue gas type absorption heat pump 14 and a heating heat source for coal mine users.
In this embodiment, the water-water heat exchanger 4, the first air-water heat exchanger 11, the second air-water heat exchanger 12, and the flue gas type absorption heat pump 14 are connected in parallel, and the water-water heat exchanger 4, the first air-water heat exchanger 11, the second air-water heat exchanger 12, and the flue gas type absorption heat pump 14 are used to simultaneously heat low-temperature hot water from the heat supply water supply pipe 103 for the first time.
The operation method of the waste heat recycling system of the coal mine in-use equipment comprises the following steps:
in the heating season:
coal mine gas 101 enters the internal combustion engine unit 1 to perform combustion and work to drive the generator unit 2 to generate power, at the moment, the first valve 21 and the second valve 22 are closed, the third valve 23, the fourth valve 24, the fifteenth valve 35 and the sixteenth valve 36 are opened, high-temperature flue gas formed by the internal combustion engine unit 1 enters the waste heat boiler 5, high-temperature cylinder liner water formed by the internal combustion engine unit 1 enters the water-water heat exchanger 4 to heat low-temperature hot water from the heat supply water supply pipe 103, and the cooled cylinder liner water returns to the internal combustion engine unit 1 to cool the internal combustion engine unit 1 to form a cycle;
the electric energy generated by the generator set 2 is used for driving the motor 13 to do work to drive the second air compressor 10 to compress the fresh air 102, at the moment, the thirteenth valve 33 and the fourteenth valve 34 are opened, the high-temperature and high-pressure air formed by the second air compressor 10 enters the second air-water heat exchanger 12, and the low-temperature hot water from the heat supply water supply pipe 103 is heated;
steam generated by the waste heat boiler 5 enters the steam turbine set 6 to do work to drive the first air compressor 9 to compress fresh air 102, exhaust steam of the steam turbine set 6 enters the condenser 7 to be condensed to form condensed water and then returns to the waste heat boiler 5 to form a cycle, at the moment, the eleventh valve 31 and the twelfth valve 32 are opened, high-temperature and high-pressure air formed by the first air compressor 9 enters the first air-water heat exchanger 11, and low-temperature hot water from the heat supply water supply pipe 103 is heated;
closing the fifth valve 25 and the sixth valve 26, opening the seventh valve 27, the eighth valve 28, the ninth valve 29, the tenth valve 30, the eleventh valve 41 and the twelfth valve 42, allowing high-temperature flue gas output by the waste heat boiler 5 to enter the flue gas type absorption heat pump 14 as a driving heat source, and heating low-temperature hot water from the heat supply water supply pipe 103 by using low-temperature circulating water output by the condenser 7 as a low-temperature heat source;
opening a seventeenth valve 37 and a nineteenth valve 39, feeding low-temperature hot water simultaneously heated by the water-water heat exchanger 4, the first air-water heat exchanger 11, the second air-water heat exchanger 12 and the flue gas type absorption heat pump 14 into the hot water storage tank 16 through the hot water supply communicating pipe 106, and then providing domestic hot water for coal mine users through the domestic hot water supply pipe 104, wherein at the moment, the fluctuation of the load required by the domestic hot water is buffered by using the hot water storage tank 16;
and opening an eighteenth valve 38, a twentieth valve 40, a twentieth valve 43 and a twenty-fourth valve 44, feeding the low-temperature hot water simultaneously heated by the water-water heat exchanger 4, the first gas-water heat exchanger 11, the second gas-water heat exchanger 12 and the flue gas type absorption heat pump 14 into the flue gas heat exchanger 15 through the hot water supply communicating pipe 106, heating the low-temperature hot water for the second time by using the high-temperature flue gas output by the waste heat boiler 5, and outputting the high-temperature flue gas for heating the coal mine users through the heating water supply pipe 105.
In the heating season period, coal mine users have no heating requirement, and the operation method needs to be changed as follows:
at this time, the eighteenth valve 38, the twentieth valve 40, the twentieth valve 43 and the twenty-fourth valve 44 need to be closed, the low-temperature hot water simultaneously heated by the water-water heat exchanger 4, the first gas-water heat exchanger 11, the second gas-water heat exchanger 12 and the flue gas type absorption heat pump 14 does not enter the flue gas heat exchanger 15 any more, but all enters the hot water storage tank 16, and then the domestic hot water is provided for the coal mine users through the domestic hot water supply pipe 104.
In the operation method of the waste heat recovery system of the coal mine in-use equipment related to the embodiment, the water-water heat exchanger 4, the first gas-water heat exchanger 11, the second gas-water heat exchanger 12 and the flue gas type absorption heat pump 14 all operate independently. When the first valve 21 and the second valve 22 are opened and the third valve 23, the fourth valve 24, the fifteenth valve 35 and the sixteenth valve 36 are closed, the high-temperature cylinder liner water formed by the internal combustion engine set 1 does not enter the water-water heat exchanger 4 to heat and supply low-temperature hot water, but enters the ventilation cooling device 3 to be cooled by means of external heat radiation and discharge; when the fifth valve 25 and the sixth valve 26 are opened and the seventh valve 27, the eighth valve 28, the ninth valve 29, the tenth valve 30, the eleventh valve 41 and the twelfth valve 42 are closed, the low-temperature circulating water heated in the condenser 7 does not enter the flue gas type absorption heat pump 14 any longer, but enters the cooling tower 8 to be cooled by means of external heat radiation and discharge; when the eleventh valve 31 and the twelfth valve 32 are closed, the first air-water heat exchanger 11 is not used for heating the low-temperature hot water from the heating water supply pipe 103; when the thirteenth valve 33 and the fourteenth valve 34 are closed, the second gas-water heat exchanger 12 is not used for heating the low-temperature hot water from the heating water supply pipe 103.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. All equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims (10)

1. The waste heat recycling system of the coal mine in-use equipment is characterized by comprising an internal combustion engine set (1), a generator set (2), a ventilation cooling device (3), a water-water heat exchanger (4), a waste heat boiler (5), a steam turbine set (6), a condenser (7), a cooling tower (8), a first air compressor (9), a second air compressor (10), a first air-water heat exchanger (11), a second air-water heat exchanger (12), a motor (13), a flue gas type absorption heat pump (14), a flue gas heat exchanger (15), a hot water storage tank (16) and a chimney (17), wherein an air inlet of the internal combustion engine set (1) is connected with coal mine gas (101), the internal combustion engine set (1) drives the generator set (2) to generate electricity, a cylinder sleeve water outlet of the internal combustion engine set (1) is simultaneously connected with a water inlet of the ventilation cooling device (3) and a high-temperature water inlet of the water, a second valve (22) and a third valve (23) are respectively installed at a water inlet of the ventilation cooling device (3) and a high-temperature water inlet of the water-water heat exchanger (4), a cylinder sleeve water inlet of the internal combustion engine set (1) is simultaneously connected with a water outlet of the ventilation cooling device (3) and a high-temperature water outlet of the water-water heat exchanger (4), a first valve (21) and a fourth valve (24) are respectively installed at a water outlet of the ventilation cooling device (3) and a high-temperature water outlet of the water-water heat exchanger (4), a flue gas outlet of the internal combustion engine set (1) is connected with a flue gas inlet of the waste heat boiler (5), a steam outlet of the waste heat boiler (5) is connected with a steam inlet of the steam turbine set (6), a steam exhaust port of the steam turbine set (6) is connected with a steam exhaust inlet of the condenser (7), a condensed water outlet of the condenser (7) is connected with a water inlet of the waste heat boiler (5), the circulating water outlet of the condenser (7) is connected with the water inlet of the cooling tower (8) and the low-temperature water inlet of the smoke absorption heat pump (14) at the same time, a fifth valve (25) and a seventh valve (27) are respectively installed at the water inlet of the cooling tower (8) and the low-temperature water inlet of the smoke absorption heat pump (14), the circulating water inlet of the condenser (7) is connected with the water outlet of the cooling tower (8) and the low-temperature water outlet of the smoke absorption heat pump (14) at the same time, a sixth valve (26) and an eighth valve (28) are respectively installed at the water outlet of the cooling tower (8) and the low-temperature water outlet of the smoke absorption heat pump (14), the turbine set (6) drives the first air compressor (9) to do work, the air inlet of the first air compressor (9) is connected with fresh air (102), the air outlet of the first air compressor (9) is connected with the air inlet of the first air-water heat exchanger (11), the motor (13) drives the second air compressor (10) to do work, an air inlet of the second air compressor (10) is connected with fresh air (102), an air outlet of the second air compressor (10) is connected with an air inlet of the second air-water heat exchanger (12), a low-temperature water inlet of the water-water heat exchanger (4) is connected with a water outlet end of the heat supply water supply pipe (103), a fifteenth valve (35) is installed at a low-temperature water inlet of the water-water heat exchanger (4), a low-temperature water outlet of the water-water heat exchanger (4) is connected with a water inlet end of the hot water supply communicating pipe (106), a sixteenth valve (36) is installed at a low-temperature water outlet of the water-water heat exchanger (4), a low-temperature water inlet of the first air-water heat exchanger (11) is connected with a water outlet end of the heat supply water supply pipe (103), and an eleventh valve (31) is, the low-temperature water outlet of the first gas-water heat exchanger (11) is connected with the water inlet end of the hot water supply communicating pipe (106), a twelfth valve (32) is installed at the low-temperature water outlet of the first gas-water heat exchanger (11), the low-temperature water inlet of the second gas-water heat exchanger (12) is connected with the water outlet end of the heat supply water feeding pipe (103), a thirteenth valve (33) is installed at the low-temperature water inlet of the second gas-water heat exchanger (12), the low-temperature water outlet of the second gas-water heat exchanger (12) is connected with the water inlet end of the hot water supply communicating pipe (106), a fourteenth valve (34) is installed at the low-temperature water outlet of the second gas-water heat exchanger (12), the medium-temperature water inlet of the flue gas type absorption heat pump (14) is connected with the water outlet end of the heat supply water feeding pipe (103), and a ninth valve (29), a medium-temperature water outlet of the smoke absorption heat pump (14) is connected with a water inlet end of the hot water supply communicating pipe (106), a tenth valve (30) is installed at the medium-temperature water outlet of the smoke absorption heat pump (14), a driving smoke inlet of the smoke absorption heat pump (14) is connected with a smoke outlet of the waste heat boiler (5), a twenty-first valve (41) is installed at the driving smoke inlet of the smoke absorption heat pump (14), a driving smoke outlet of the smoke absorption heat pump (14) is connected with a smoke inlet of a chimney (17), a twenty-twelve valve (42) is installed at the driving smoke outlet of the smoke absorption heat pump (14), a water inlet of the hot water storage tank (16) is connected with a water outlet end of the hot water supply communicating pipe (106), and a seventeenth valve (37) is installed at a water inlet of the hot water storage tank (16), the water outlet of the hot water storage tank (16) is connected with the water inlet end of a domestic hot water pipe (104), a nineteenth valve (39) is arranged at the water outlet of the hot water storage tank (16), the water inlet of the flue gas heat exchanger (15) is connected with the water outlet end of the hot water supply communicating pipe (106), an eighteenth valve (38) is arranged at the water inlet of the flue gas heat exchanger (15), the water outlet of the flue gas heat exchanger (15) is connected with the water inlet end of the heating water supply pipe (105), a twentieth valve (40) is arranged at the water outlet of the flue gas heat exchanger (15), the flue gas inlet of the flue gas heat exchanger (15) is connected with the flue gas outlet of the waste heat boiler (5), and a second thirteen valve (43) is arranged at the flue gas inlet of the flue gas heat exchanger (15), the smoke outlet of the smoke heat exchanger (15) is connected with the smoke inlet of the chimney (17), and a twenty-fourth valve (40) is arranged at the smoke outlet of the smoke heat exchanger (15).
2. The waste heat recycling system of in-use coal equipment as claimed in claim 1, wherein the high temperature cylinder liner water side of the internal combustion engine set (1) is connected with the ventilation cooling device (3) and the water-water heat exchanger (4) at the same time, so that the cylinder liner water is cooled by means of external heat emission and by means of waste heat recycling and heat supply.
3. The waste heat recovery system of the coal mine in-use equipment as claimed in claim 1, wherein the waste heat boiler (5) is connected with the flue gas type absorption heat pump (14) and the flue gas heat exchanger (15) at the same time, and is used for providing a driving heat source for the flue gas type absorption heat pump (14) and a heating heat source for coal mine users.
4. The system for recycling the waste heat of the coal mine in-use equipment as claimed in claim 1, wherein the low-temperature circulating water side of the condenser (7) is connected with the flue gas type absorption heat pump (14) and the cooling tower (8) at the same time, so that the low-temperature circulating water is cooled by means of external heat emission and by means of waste heat recycling and heat supply.
5. The waste heat recovery system of the coal mine in-use equipment as claimed in claim 1, wherein the water-water heat exchanger (4), the first gas-water heat exchanger (11), the second gas-water heat exchanger (12) and the flue gas type absorption heat pump (14) are connected in parallel, and the water-water heat exchanger (4), the first gas-water heat exchanger (11), the second gas-water heat exchanger (12) and the flue gas type absorption heat pump (14) are used for simultaneously heating low-temperature hot water from the heat supply water supply pipe (103) for the first time.
6. The waste heat recycling system of the coal mine in-use equipment as claimed in claim 1, wherein the hot water storage tank (16) is connected with the water-water heat exchanger (4), the first air-water heat exchanger (11), the second air-water heat exchanger (12) and the flue gas type absorption heat pump (14) through a hot water supply communicating pipe (106) at the same time, and provides domestic hot water for coal mine users by recycling high-temperature cylinder liner water waste heat of the internal combustion engine set (1), high-temperature compressed air waste heat of the first air compressor (9), high-temperature compressed air waste heat of the second air compressor (10) and low-temperature circulating water waste heat of the condenser (7).
7. The waste heat recycling system of the coal mine in-use equipment as claimed in claim 1, wherein the flue gas heat exchanger (15) is connected with the water-water heat exchanger (4), the first air-water heat exchanger (11), the second air-water heat exchanger (12) and the flue gas type absorption heat pump (14) through a hot water supply communicating pipe (106), low-temperature hot water from the hot water supply pipe (103) is heated for the first time and then is conveyed to the flue gas heat exchanger (15), and the low-temperature hot water is heated for the second time and then is output by the heating water supply pipe (105) to supply heat for coal mine users.
8. A method of operating a waste heat recovery system for a coal mine in-use facility as defined in any one of claims 1 to 7, the method comprising:
coal mine gas (101) enters an internal combustion engine set (1) to perform combustion work to drive a generator set (2) to generate power, at the moment, a first valve (21) and a second valve (22) are closed, a third valve (23), a fourth valve (24), a fifteenth valve (35) and a sixteenth valve (36) are opened, high-temperature flue gas formed by the internal combustion engine set (1) enters a waste heat boiler (5), high-temperature cylinder liner water formed by the internal combustion engine set (1) enters a water-water heat exchanger (4), low-temperature hot water from a heat supply water supply pipe (103) is heated, and the cooled cylinder liner water returns to the internal combustion engine set (1) to cool the cylinder liner water to form a circulation;
the electric energy generated by the generator set (2) is used for driving the motor (13) to do work to drive the second air compressor (10) to compress the fresh air (102), at the moment, the thirteenth valve (33) and the fourteenth valve (34) are opened, high-temperature and high-pressure air formed by the second air compressor (10) enters the second air-water heat exchanger (12), and low-temperature hot water from the heat supply water supply pipe (103) is heated;
steam generated by the waste heat boiler (5) enters the steam turbine set (6) to do work to drive the first air compressor (9) to compress fresh air (102), exhaust steam of the steam turbine set (6) enters the condenser (7) to be condensed to form condensed water and then returns to the waste heat boiler (5) to form a cycle, at the moment, the eleventh valve (31) and the twelfth valve (32) are opened, high-temperature and high-pressure air formed by the first air compressor (9) enters the first air-water heat exchanger (11), and low-temperature hot water from the heat supply water supply pipe (103) is heated;
closing the fifth valve (25) and the sixth valve (26), opening the seventh valve (27), the eighth valve (28), the ninth valve (29), the tenth valve (30), the eleventh valve (41) and the twelfth valve (42), enabling high-temperature flue gas output by the waste heat boiler (5) to enter the flue gas type absorption heat pump (14) to serve as a driving heat source, and heating low-temperature hot water from the heat supply water supply pipe (103) by using low-temperature circulating water output by the condenser (7) as a low-temperature heat source;
opening a seventeenth valve (37) and a nineteenth valve (39), enabling low-temperature hot water which is simultaneously heated by the water-water heat exchanger (4), the first air-water heat exchanger (11), the second air-water heat exchanger (12) and the smoke absorption heat pump (14) to firstly enter a hot water storage tank (16) through a hot water supply communicating pipe (106), and then providing domestic hot water for coal mine users through a domestic hot water supply pipe (104), wherein at the moment, the fluctuation of the load required by the domestic hot water is buffered by using the hot water storage tank (16);
the eighteenth valve (38), the twentieth valve (40), the twenty-third valve (43) and the twenty-fourth valve (44) are opened, low-temperature hot water which is simultaneously heated by the water-water heat exchanger (4), the first gas-water heat exchanger (11), the second gas-water heat exchanger (12) and the smoke absorption heat pump (14) still enters the smoke heat exchanger (15) through the hot water supply communicating pipe (106), high-temperature smoke output by the waste heat boiler (5) is used for carrying out secondary heating on the low-temperature hot water, and then the low-temperature hot water is output through the heating water supply pipe (105) to supply heat for coal mine users.
9. The method of operating a waste heat recovery system for a coal mine equipment as set forth in claim 8, wherein: when in non-heating seasons, coal mine users have no heating demand, at the moment, the eighteenth valve (38), the twentieth valve (40), the twenty-third valve (43) and the twenty-fourth valve (44) need to be closed, low-temperature hot water after being heated simultaneously by the water-water heat exchanger (4), the first air-water heat exchanger (11), the second air-water heat exchanger (12) and the smoke absorption heat pump (14) does not enter the smoke heat exchanger (15) any more, but all the low-temperature hot water enters the hot water storage tank (16), and then the domestic hot water is provided for the coal mine users through the domestic hot water supply pipe (104).
10. The method of operating a waste heat recovery system for a coal mine equipment as set forth in claim 8, wherein:
the water-water heat exchanger (4), the first gas-water heat exchanger (11), the second gas-water heat exchanger (12) and the flue gas type absorption heat pump (14) all operate independently;
when the water-water heat exchanger (4) stops operating, a first valve (21) and a second valve (22) are opened, a third valve (23), a fourth valve (24), a fifteenth valve (35) and a sixteenth valve (36) are closed, and high-temperature cylinder liner water formed by the internal combustion engine set (1) does not enter the water-water heat exchanger (4) to heat low-temperature hot water, but enters the ventilation cooling device (3) to be cooled by means of external heat dissipation and discharge;
when the flue gas type absorption heat pump (14) stops operating, opening a fifth valve (25) and a sixth valve (26), closing a seventh valve (27), an eighth valve (28), a ninth valve (29), a tenth valve (30), an eleventh valve (41) and a twelfth valve (42), and cooling low-temperature circulating water heated in the condenser (7) does not enter the flue gas type absorption heat pump (14) any more but enters a cooling tower (8) to be cooled by means of external heat dissipation and discharge;
when the first gas-water heat exchanger (11) stops operating, closing the eleventh valve (31) and the twelfth valve (32), and no longer utilizing the first gas-water heat exchanger (11) to heat low-temperature hot water from a heat supply water supply pipe (103);
when the second gas-water heat exchanger (12) stops operating, the thirteenth valve (33) and the fourteenth valve (34) are closed, and the second gas-water heat exchanger (12) is not used for heating low-temperature hot water from the heat supply water supply pipe (103).
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