CN102374692B - Power-plant waste-heat recovering device - Google Patents

Power-plant waste-heat recovering device Download PDF

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CN102374692B
CN102374692B CN201110291106.8A CN201110291106A CN102374692B CN 102374692 B CN102374692 B CN 102374692B CN 201110291106 A CN201110291106 A CN 201110291106A CN 102374692 B CN102374692 B CN 102374692B
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pipeline
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heat pump
cooling water
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CN102374692A (en
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李同强
李志搏
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Zhejiang Gongshang University
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    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/62—Absorption based systems
    • Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
    • 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
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

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Abstract

本发明涉及一种热回收装置，公开了一种发电厂废热回收装置，包括蒸汽管路(4)、高温废水管路(6)、冷却水循环管路(1)、除盐水管路(5)，所述的除盐水管路(5)连接除盐水箱(54)，经过与水水换热器(9)后通过除盐水回水管路回到除盐水箱(54)。所述的除盐水回水管路上设有除盐水回水管路控制阀(52)，水水换热器(9)与除盐水回水管路控制阀(52)之间设有除氧管路，除氧管路与除氧器(53)连接。本发明通过采用热泵技术回收电厂冷凝热、废水余热，具有热能回收利用率高，节能环保的优点。

The invention relates to a heat recovery device, and discloses a waste heat recovery device for a power plant, comprising a steam pipeline (4), a high-temperature waste water pipeline (6), a cooling water circulation pipeline (1), and a desalinated water pipeline (5) , the desalinated water pipeline (5) is connected to the desalted water tank (54), and returns to the desalted water tank (54) through the desalted water return pipeline after passing through the water-to-water heat exchanger (9). The desalted water return pipeline is provided with a desalted water return pipeline control valve (52), and a deoxygenation pipeline is provided between the water-water heat exchanger (9) and the desalted water return pipeline control valve (52). Oxygen pipeline is connected with deaerator (53). The invention adopts the heat pump technology to recycle the condensation heat of the power plant and waste water waste heat, and has the advantages of high heat energy recycling rate, energy saving and environmental protection.

Description

发电厂废热回收装置Power Plant Waste Heat Recovery Unit

技术领域technical field

本发明涉及一种热回收装置，尤其涉及一种发电厂废热回收装置。The invention relates to a heat recovery device, in particular to a waste heat recovery device of a power plant.

背景技术Background technique

火力发电厂冷凝热通过凉水塔或空冷岛排入大气形成巨大的热能损失，是火力发电厂能源使用效率低下的主要原因，不仅造成能量和水或电的浪费，同时也严重地污染了大气。火力发电厂冷凝热排空，是我国乃至世界普遍存在的问题，是浪费，也是无奈。然而，随着热泵技术的发展，特别是大型高温水源热泵的问世，使得发电机组废热回收将成为可能。Condensation heat in thermal power plants is discharged into the atmosphere through cooling towers or air-cooled islands, resulting in huge heat loss, which is the main reason for the low efficiency of energy use in thermal power plants. It not only causes waste of energy and water or electricity, but also seriously pollutes the atmosphere. The evacuation of condensation heat in thermal power plants is a common problem in our country and even in the world. It is a waste and helpless. However, with the development of heat pump technology, especially the advent of large-scale high-temperature water source heat pumps, it will become possible to recover waste heat from generator sets.

发明内容Contents of the invention

本发明针对现有技术中冷凝热、蒸汽热难以利用与回收，提供了一种采用热泵技术回收电厂冷凝热、废水余热的发电厂废热回收装置。Aiming at the difficult utilization and recovery of condensation heat and steam heat in the prior art, the invention provides a power plant waste heat recovery device which adopts heat pump technology to recover power plant condensation heat and waste water waste heat.

为了解决上述技术问题，本发明通过下述技术方案得以解决：In order to solve the above technical problems, the present invention is solved through the following technical solutions:

发电厂废热回收装置，包括蒸汽管路、高温废水管路、冷却水循环管路、除盐水管路，所述的蒸汽管路连接汽机与凝汽器；高温废水管路连接溴化锂制冷机与吸收热泵；冷却水循环管路从冷却循环水池开始，经过凝汽器(13)、吸收热泵、溴化锂制冷机后回到冷却循环水池；所述的除盐水管路连接除盐水箱，除盐水管路中的水流经水水换热器后通过除盐水回水管路回到除盐水箱。除盐水管路中的热能通过水水换热器获得。A waste heat recovery device in a power plant, including a steam pipeline, a high-temperature waste water pipeline, a cooling water circulation pipeline, and a desalinated water pipeline. The steam pipeline is connected to a steam turbine and a condenser; the high-temperature waste water pipeline is connected to a lithium bromide refrigerator and an absorption heat pump The cooling water circulation pipeline starts from the cooling circulation pool, and returns to the cooling circulation water pool after the condenser (13), absorption heat pump and lithium bromide refrigerator; the desalinated water pipeline is connected to the desalted water tank, and the The water flows through the water-to-water heat exchanger and returns to the desalinated water tank through the desalted water return pipeline. The heat energy in the desalted water pipeline is obtained through the water-to-water heat exchanger.

作为优选，所述的蒸汽管路连接汽机与凝汽器；高温废水管路连接溴化锂制冷机与吸收热泵；冷却水循环管路从冷却循环水池开始，经过凝汽器、吸收热泵、溴化锂制冷机制冷后回到冷却循环水池。Preferably, the steam pipeline is connected to the steam turbine and the condenser; the high-temperature waste water pipeline is connected to the lithium bromide refrigerator and the absorption heat pump; Then return to the cooling circulating pool.

作为优选，所述的冷却水循环管路还经过离心热泵，离心热泵设置在吸收热泵与溴化锂制冷机之间。通过设置离心热泵，可以将经过吸收热泵的冷却水的热能进行进一步的热能交换，通过内循环管路将冷却水循环管路中的热能传递给除盐水管路，提高了热能的利用率。Preferably, the cooling water circulation pipeline also passes through a centrifugal heat pump, and the centrifugal heat pump is arranged between the absorption heat pump and the lithium bromide refrigerator. By setting the centrifugal heat pump, the heat energy of the cooling water passing through the absorption heat pump can be further exchanged for heat energy, and the heat energy in the cooling water circulation pipeline is transferred to the desalinated water pipeline through the internal circulation pipeline, which improves the utilization rate of heat energy.

作为优选，所述的冷却水循环管路上还设有冷却水回水管路，冷却水回水管路经过水水换热器，除盐水管路也经过水水换热器；冷却水回水管路的进水口设置在离心热泵与溴化锂制冷机之间，冷却水回水管路的回水口设置在凝汽器与吸收热泵之间。通过设置冷却水回水管路，可以选择打开冷却水回水管路补水阀，将在离心热泵进行热交换后的冷却水重新输送回吸收热泵进行热交换。同时，冷却水回水管路还经过除盐水管路，并将一部分的热能直接传递给除盐水管路。As a preference, the cooling water circulation pipeline is also provided with a cooling water return pipeline, the cooling water return pipeline passes through the water-to-water heat exchanger, and the demineralized water pipeline also passes through the water-to-water heat exchanger; the inlet of the cooling water return pipeline The water port is arranged between the centrifugal heat pump and the lithium bromide refrigerator, and the water return port of the cooling water return pipeline is arranged between the condenser and the absorption heat pump. By setting the cooling water return pipeline, you can choose to open the replenishment valve of the cooling water return pipeline, and re-transmit the cooling water after the heat exchange in the centrifugal heat pump back to the absorption heat pump for heat exchange. At the same time, the cooling water return pipeline also passes through the desalinated water pipeline, and directly transfers part of the heat energy to the desalted water pipeline.

作为优选，还包括内循环管路，内循环管路经过离心热泵、吸收热泵、溴化锂制冷机以及水水换热器。内循环管路通过冷却水循环管路上的吸收热泵、高温废水管路中的溴化锂制冷机以及冷却水回水管路上的离心热泵进行热交换获取热能，然后通过水水换热器将获得的热能以热交换的方式传递给除盐水管路。Preferably, it also includes an internal circulation pipeline, and the internal circulation pipeline passes through a centrifugal heat pump, an absorption heat pump, a lithium bromide refrigerator and a water-to-water heat exchanger. The internal circulation pipeline obtains heat energy through heat exchange through the absorption heat pump on the cooling water circulation pipeline, the lithium bromide refrigerator in the high-temperature waste water pipeline, and the centrifugal heat pump on the cooling water return pipeline, and then converts the obtained heat energy into heat through a water-to-water heat exchanger. The way of exchange is passed to the desalinated water pipeline.

作为优选，所述的冷却水回水管路上设有冷却水回水管路循环泵与冷却水回水管路补水阀，冷却水回水管路补水阀设置在进入溴化锂制冷机之前的冷却水回水管路上。通过打开冷却水回水管路补水阀可以对经过吸收热泵的冷却水进行二次回收利用，提高了热能的利用效率。Preferably, the cooling water return pipeline is provided with a cooling water return pipeline circulation pump and a cooling water return pipeline replenishment valve, and the cooling water return pipeline replenishment valve is arranged on the cooling water return pipeline before entering the lithium bromide refrigerator. By opening the replenishment valve of the cooling water return pipeline, the cooling water passing through the absorption heat pump can be recycled twice, which improves the utilization efficiency of heat energy.

作为优选，所述的蒸汽管路经过汽机，将汽机产生的蒸汽输送至凝汽器，蒸汽经过凝汽器将热能传递给冷却水循环管路中的冷却水后凝水排出。Preferably, the steam pipeline passes through the steam turbine, and the steam generated by the steam turbine is sent to the condenser, and the steam passes through the condenser to transfer heat energy to the cooling water in the cooling water circulation pipeline, and then the condensed water is discharged.

作为优选，所述的内循环管路上设有内循环管路补水阀。随着内循环管路内的水在不断的吸收释放热能会有一定的蒸发损耗，因此，通内循环管路补水阀可以对内循环管路内的水进行一定的补充，从而保证内循环管路的正常运作。Preferably, the internal circulation pipeline is provided with an internal circulation pipeline water replenishment valve. As the water in the internal circulation pipeline continuously absorbs and releases heat energy, there will be a certain evaporation loss. Therefore, the water supply valve through the internal circulation pipeline can supplement the water in the internal circulation pipeline to a certain extent, so as to ensure that the internal circulation pipeline normal operation of the road.

本发明通过采用热泵技术回收电厂冷凝热、废水余热，具有热能回收利用率高，节能环保的优点。The invention adopts the heat pump technology to recycle the condensation heat of the power plant and waste water waste heat, and has the advantages of high heat energy recycling rate, energy saving and environmental protection.

附图说明Description of drawings

图1为本发明实施例1的结构示意图。Fig. 1 is a schematic structural diagram of Embodiment 1 of the present invention.

其中1-冷却水循环管路、2-冷却水回水管路、3-内循环管路、4-蒸汽管路、5-除盐水管路、6-高温废水管路、7-吸收热泵、8-溴化锂制冷机、9-水水换热器、10-离心热泵、11-冷却循环泵、12-冷却循环水池、13-凝汽器、15-、21-冷却水回水管路循环泵、22-冷却水回水管路补水阀、31-内循环管路循环泵、32-内循环管路补水阀、41-汽机、51-除盐水管路循环泵、52-除盐水回水管路控制阀、53-除氧器、54-除盐水箱、61-废水池。Among them, 1-cooling water circulation pipeline, 2-cooling water return pipeline, 3-internal circulation pipeline, 4-steam pipeline, 5-demineralized water pipeline, 6-high temperature waste water pipeline, 7-absorption heat pump, 8- Lithium bromide refrigerator, 9-water heat exchanger, 10-centrifugal heat pump, 11-cooling circulation pump, 12-cooling circulation pool, 13-condenser, 15-, 21-cooling water return pipeline circulation pump, 22- Cooling water return pipeline replenishment valve, 31-inner circulation pipeline circulation pump, 32-internal circulation pipeline water supplement valve, 41-turbine, 51-demineralized water pipeline circulation pump, 52-demineralized water return pipeline control valve, 53 - deaerator, 54 - desalinated water tank, 61 - waste water tank.

具体实施方式Detailed ways

下面结合附图1与具体实施方式对本发明作进一步详细描述：Below in conjunction with accompanying drawing 1 and specific embodiment the present invention is described in further detail:

实施例1Example 1

发电厂废热回收装置，如图1所示，包括蒸汽管路4、高温废水管路6、冷却水循环管路1、除盐水管路5，所述的蒸汽管路4连接汽机41与凝汽器13；高温废水管路6连接溴化锂制冷机8与吸收热泵7；冷却水循环管路1从冷却循环水池12开始，经过凝汽器13、吸收热泵7、溴化锂制冷机8后回到冷却循环水池12。汽机41产生的蒸汽输送至凝汽器13，蒸汽经过凝汽器13将热能传递给冷却水循环管路1中的冷却水，带有热能的冷却水经过吸收热泵7并在吸收热泵7内与内循环管路3进行热交换，内循环管路3通过水水换热器9将热能传递给除盐水管路5。高温废水管路6通过在溴化锂制冷机8与吸收热泵7的热交换，将热能传递给冷却水循环管路1以及冷却水回水管路2，其中冷却水回水管路2又通过水水换热器9将热能传递给除盐水管路5。冷却水循环管路1以及高温废水管路6都经过溴化锂制冷机8，其管路中的热能可以作为溴化锂制冷机8的热动力源，进行制冷。高温废水管路6依次经过溴化锂制冷机8、吸收热泵7并释放热能。其中，冷却水循环管路1为j1、冷却水回水管路2为j2、内循环管路3为j3、蒸汽管路4为j4、除盐水管路5为j5、高温废水管路6为j6。The waste heat recovery device of a power plant, as shown in Figure 1, includes a steam pipeline 4, a high-temperature waste water pipeline 6, a cooling water circulation pipeline 1, and a desalinated water pipeline 5. The steam pipeline 4 is connected to the steam turbine 41 and the condenser 13. The high-temperature waste water pipeline 6 is connected to the lithium bromide refrigerator 8 and the absorption heat pump 7; the cooling water circulation pipeline 1 starts from the cooling circulation pool 12, and returns to the cooling circulation pool 12 after passing through the condenser 13, the absorption heat pump 7, and the lithium bromide refrigerator 8 . The steam generated by the steam turbine 41 is sent to the condenser 13, and the steam passes through the condenser 13 to transfer heat energy to the cooling water in the cooling water circulation pipeline 1, and the cooling water with heat energy passes through the absorption heat pump 7 and is in the absorption heat pump 7. The circulation pipeline 3 performs heat exchange, and the internal circulation pipeline 3 transfers heat energy to the desalinated water pipeline 5 through the water-to-water heat exchanger 9 . The high-temperature wastewater pipeline 6 transfers heat energy to the cooling water circulation pipeline 1 and the cooling water return pipeline 2 through the heat exchange between the lithium bromide refrigerator 8 and the absorption heat pump 7, wherein the cooling water return pipeline 2 passes through the water-to-water heat exchanger 9 Transfer heat energy to the desalinated water pipeline 5 . Both the cooling water circulation pipeline 1 and the high-temperature waste water pipeline 6 pass through the lithium bromide refrigerator 8, and the heat energy in the pipelines can be used as the thermal power source of the lithium bromide refrigerator 8 for refrigeration. The high-temperature waste water pipeline 6 sequentially passes through the lithium bromide refrigerator 8 and the absorption heat pump 7 to release heat energy. Among them, the cooling water circulation pipeline 1 is j1, the cooling water return pipeline 2 is j2, the internal circulation pipeline 3 is j3, the steam pipeline 4 is j4, the demineralized water pipeline 5 is j5, and the high-temperature waste water pipeline 6 is j6.

冷却水循环管路1还经过离心热泵10，离心热泵10设置在吸收热泵7与溴化锂制冷机8之间。通过设置离心热泵10，可以将经过吸收热泵7的冷却水的热能进行进一步的热能交换，通过内循环管路3将冷却水循环管路1中的热能传递给除盐水管路5，提高了热能的利用率。冷却水循环管路1上设有冷却循环泵11，冷却循环泵11设置在冷却循环水池12与凝汽器13之间。冷却水循环管路1依次经过吸收热泵7、离心热泵10、溴化锂制冷机8并释放热能。The cooling water circulation pipeline 1 also passes through a centrifugal heat pump 10 , and the centrifugal heat pump 10 is arranged between the absorption heat pump 7 and the lithium bromide refrigerator 8 . By setting the centrifugal heat pump 10, the thermal energy of the cooling water passing through the absorption heat pump 7 can be further exchanged, and the thermal energy in the cooling water circulation pipeline 1 can be transferred to the desalinated water pipeline 5 through the internal circulation pipeline 3, thereby improving the efficiency of thermal energy. utilization rate. A cooling circulation pump 11 is provided on the cooling water circulation pipeline 1 , and the cooling circulation pump 11 is arranged between the cooling circulation water pool 12 and the condenser 13 . The cooling water circulation pipeline 1 sequentially passes through the absorption heat pump 7, the centrifugal heat pump 10, and the lithium bromide refrigerator 8 to release heat energy.

冷却水循环管路1上还设有冷却水回水管路2，冷却水回水管路2经过水水换热器9，除盐水管路5也经过水水换热器9；冷却水回水管路2的进水口设置在离心热泵10与溴化锂制冷机8之间，冷却水回水管路2的回水口设置在凝汽器13与吸收热泵7之间。通过设置冷却水回水管路2，可以选择打开冷却水回水管路补水阀22，将在离心热泵10进行热交换后的冷却水重新输送回吸收热泵7进行热交换。同时，冷却水回水管路2还经过除盐水管路5，并将一部分的热能直接传递给除盐水管路5。冷却水回水管路2上还设有冷却水回水管路循环泵21。冷却水回水管路2通过在溴化锂制冷机8处吸收热能，然后通过水水换热器9将热能传递给除盐水管路5，然后与进入吸收热泵7之前的冷却水循环管路1汇合后进入吸收热泵7。The cooling water circulation pipeline 1 is also provided with a cooling water return pipeline 2, the cooling water return pipeline 2 passes through the water-water heat exchanger 9, and the demineralized water pipeline 5 also passes through the water-water heat exchanger 9; the cooling water return pipeline 2 The water inlet of the cooling water return line 2 is arranged between the condenser 13 and the absorption heat pump 7 . By setting the cooling water return pipeline 2 , the replenishment valve 22 of the cooling water return pipeline can be selectively opened, and the cooling water after the heat exchange in the centrifugal heat pump 10 is sent back to the absorption heat pump 7 for heat exchange. At the same time, the cooling water return pipeline 2 also passes through the desalinated water pipeline 5 and directly transfers a part of heat energy to the desalted water pipeline 5 . The cooling water return pipeline 2 is also provided with a cooling water return pipeline circulating pump 21 . The cooling water return pipeline 2 absorbs heat energy at the lithium bromide refrigerator 8, then transfers the heat energy to the desalinated water pipeline 5 through the water-water heat exchanger 9, and then merges with the cooling water circulation pipeline 1 before entering the absorption heat pump 7 and then enters Absorption heat pump7.

除盐水管路5连接除盐水箱54，经过与水水换热器9后通过除盐水回水管路回到盐水箱54。除盐水管路5中的热能通过水水换热器9获得。除盐水管路5上设有除盐水管路循环泵51，除盐水管路循环泵51设置在水水换热器9与除盐水箱54之间。除盐水管路5经过与水水换热器9后吸收热能。当除盐水管路5内水温升高至90℃以上后，打开除盐水回水管路控制阀52，将热水输送给除氧器53。经过除氧器53处理后的水被输送到发电锅炉，从而将发电厂的凝结热、废水余热进行有效的回收利用，具有热能回收利用率高，节能环保的优点。The desalted water pipeline 5 is connected to the desalted water tank 54 , and returns to the brine tank 54 through the desalted water return pipeline after passing through the water-to-water heat exchanger 9 . The heat energy in the desalted water pipeline 5 is obtained through a water-to-water heat exchanger 9 . The desalinated water pipeline 5 is provided with a desalinated water pipeline circulation pump 51 , and the desalted water pipeline circulation pump 51 is arranged between the water-to-water heat exchanger 9 and the desalinated water tank 54 . The desalted water pipeline 5 absorbs heat energy after passing through the water-to-water heat exchanger 9 . When the temperature of the water in the desalinated water pipeline 5 rises above 90° C., the control valve 52 of the desalted water return pipeline is opened to deliver hot water to the deaerator 53 . The water treated by the deaerator 53 is sent to the power generation boiler, so that the condensation heat of the power plant and waste water waste heat are effectively recycled, which has the advantages of high heat energy recovery and utilization rate, energy saving and environmental protection.

还包括内循环管路3，内循环管路3经过离心热泵10、吸收热泵7、溴化锂制冷机8以及水水换热器9。内循环管路3通过冷却水循环管路1上的吸收热泵7、高温废水管路6中的溴化锂制冷机8以及冷却水回水管路2上的离心热泵10进行热交换获取热能，然后通过水水换热器9将获得的热能以热交换的方式传递给除盐水管路5。内循环管路3上设有内循环管路循环泵31，内循环管路循环泵31设置在离心热泵10与水水换热器9之间。内循环管路3内的水经过离心热泵10后获得热能，温度升高至70℃以上，此时在流经吸收热泵7，因为经过吸收热泵7的冷却水温度更高，因此内循环管路3内的水被继续加热后，内循环管路3经过溴化锂制冷机8释放部分热能，然后经过水水换热器9继续释放热能后温度下降至53℃以下。It also includes an internal circulation pipeline 3 , and the internal circulation pipeline 3 passes through a centrifugal heat pump 10 , an absorption heat pump 7 , a lithium bromide refrigerator 8 and a water-to-water heat exchanger 9 . The internal circulation pipeline 3 performs heat exchange through the absorption heat pump 7 on the cooling water circulation pipeline 1, the lithium bromide refrigerator 8 in the high-temperature waste water pipeline 6, and the centrifugal heat pump 10 on the cooling water return pipeline 2 to obtain heat energy, and then passes through the water The heat exchanger 9 transfers the obtained heat energy to the desalinated water pipeline 5 in the form of heat exchange. The internal circulation pipeline 3 is provided with an internal circulation pipeline circulation pump 31 , and the internal circulation pipeline circulation pump 31 is arranged between the centrifugal heat pump 10 and the water-to-water heat exchanger 9 . The water in the internal circulation pipeline 3 obtains heat energy after passing through the centrifugal heat pump 10, and its temperature rises above 70°C. At this time, it flows through the absorption heat pump 7, because the cooling water passing through the absorption heat pump 7 has a higher temperature, so the internal circulation pipeline After the water in 3 is continuously heated, the internal circulation pipeline 3 releases part of the heat energy through the lithium bromide refrigerator 8, and then passes through the water-to-water heat exchanger 9 to continue releasing heat energy, and then the temperature drops below 53°C.

冷却水回水管路2上设有冷却水回水管路循环泵21与冷却水回水管路补水阀22，冷却水回水管路补水阀22设置在进入溴化锂制冷机8之前的冷却水回水管路2上。通过打开冷却水回水管路补水阀22可以对经过吸收热泵7的冷却水进行二次回收利用，提高了热能的利用效率。当冷却水回水管路补水阀22打开后，经过离心热泵10的热水一部分继续在冷却水循环管路1上，另一部分进入冷却水回水管路2；此时，通过冷却水回水管路补水阀22补充进入温度较低的常温水，使得通过冷却水回水管路2进入溴化锂制冷机8前的水温大大降低，并且在经过溴化锂制冷机8时吸收了热能，转而将这部分热能通过水水换热器9传递给除盐水管路5。The cooling water return pipeline 2 is provided with a cooling water return pipeline circulation pump 21 and a cooling water return pipeline replenishment valve 22, and the cooling water return pipeline replenishment valve 22 is arranged on the cooling water return pipeline 2 before entering the lithium bromide refrigerator 8 superior. By opening the replenishment valve 22 of the cooling water return pipeline, the cooling water passing through the absorption heat pump 7 can be recycled for secondary use, which improves the utilization efficiency of heat energy. When the cooling water return pipeline replenishment valve 22 is opened, part of the hot water passing through the centrifugal heat pump 10 continues on the cooling water circulation pipeline 1, and the other part enters the cooling water return pipeline 2; at this time, through the cooling water return pipeline replenishment valve 22 Supplement the normal temperature water with lower temperature, so that the water temperature before entering the lithium bromide refrigerator 8 through the cooling water return line 2 is greatly reduced, and absorbs heat energy when passing through the lithium bromide refrigerator 8, and turns this part of heat energy through the water The heat exchanger 9 passes to the demineralized water line 5 .

除盐水回水管路上设有除盐水回水管路控制阀52，水水换热器9与除盐水回水管路控制阀52之间设有除氧管路，除氧管路与除氧器53连接。当除盐水回水管路控制阀52打开时，除盐水管路5中的水通过水水换热器9后回流至除盐水箱54；当除盐水回水管路控制阀52关闭时，除盐水管路5中的水通过水水换热器9后通过除氧管路进入除氧器53。经过除氧器53处理后的水被输送到发电锅炉，从而将发电厂的凝结热、废水余热进行有效的回收利用，具有热能回收利用率高，节能环保的优点。A desalinated water return pipeline control valve 52 is provided on the desalted water return pipeline, and a deoxygenation pipeline is provided between the water-water heat exchanger 9 and the desalted water return pipeline control valve 52, and the deoxygenation pipeline is connected to the deaerator 53 . When the desalted water return pipeline control valve 52 is opened, the water in the desalted water pipeline 5 passes through the water-to-water heat exchanger 9 and then returns to the desalted water tank 54; when the desalted water return pipeline control valve 52 is closed, the desalted water pipeline The water in the road 5 enters the deaerator 53 through the deaeration pipeline after passing through the water-to-water heat exchanger 9 . The water treated by the deaerator 53 is sent to the power generation boiler, so that the condensation heat and waste water waste heat of the power plant are effectively recycled, which has the advantages of high heat energy recovery and utilization rate, energy saving and environmental protection.

蒸汽管路4经过汽机41，将汽机41产生的蒸汽输送至凝汽器13，蒸汽经过凝汽器13将热能传递给冷却水循环管路1中的冷却水后凝水排出。锅炉产生的蒸汽在汽机中作功，在这个热媒的循环过程中，需要放出大量的冷凝热，经汽机作功后的蒸汽通过排汽进入凝汽器13，在凝汽器13冷凝的过程中释放热能并凝结成水再经回热后进入锅炉，此时，经过凝汽器13冷却水循环管路1中的冷却水温度升高。The steam pipeline 4 passes through the steam turbine 41, and transports the steam generated by the steam turbine 41 to the condenser 13, and the steam passes through the condenser 13 to transfer heat energy to the cooling water in the cooling water circulation pipeline 1, and then the condensed water is discharged. The steam produced by the boiler works in the steam turbine. During the circulation process of the heat medium, a large amount of condensation heat needs to be released. The steam after the work of the steam turbine enters the condenser 13 through the exhaust steam, and is condensed in the condenser 13. Release heat energy in the water, condense into water and then enter the boiler after reheating. At this time, the temperature of the cooling water in the cooling water circulation pipeline 1 passing through the condenser 13 increases.

内循环管路3上设有内循环管路补水阀32。随着内循环管路3内的水在不断的吸收释放热能会有一定的蒸发损耗，因此，通内循环管路补水阀32可以对内循环管路3内的水进行一定的补充，从而保证内循环管路3的正常运作。The internal circulation pipeline 3 is provided with an internal circulation pipeline water supply valve 32 . As the water in the internal circulation pipeline 3 continuously absorbs and releases heat energy, there will be a certain evaporation loss. Therefore, the water supply valve 32 through the internal circulation pipeline can supplement the water in the internal circulation pipeline 3 to a certain extent, thereby ensuring The normal operation of the internal circulation pipeline 3.

总之，以上所述仅为本发明的较佳实施例，凡依本发明申请专利范围所作的均等变化与修饰，皆应属本发明专利的涵盖范围。In a word, the above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the patent of the present invention.

Claims (6)

1. a power-plant waste-heat recovering device, comprise steam pipework (4), hot waste water pipeline (6), cooling water circulation pipeline (1), demineralized water pipeline (5), it is characterized in that: described steam pipework (4) connects steam turbine (41) and condenser (13); Hot waste water pipeline (6) connects lithium bromide refrigerator (8) and sorption type heat pump (7); Cooling water circulation pipeline (1), from cool cycles pond (12), is got back to cool cycles pond (12) after condenser (13), sorption type heat pump (7), lithium bromide refrigerator (8); Described demineralized water pipeline (5) connects sweet-water tank (54), and the current in demineralized water pipeline (5) are got back to sweet-water tank (54) by demineralized water water return pipeline after water water-to-water heat exchanger (9); Demineralized water water return pipeline is provided with demineralized water water return pipeline control valve (52), between water water-to-water heat exchanger (9) and demineralized water water return pipeline control valve (52), be provided with deoxygenation pipeline, deoxygenation pipeline is connected with oxygen-eliminating device (53); Also comprise inner loop pipeline (3), inner loop pipeline (3) is through centrifugal heat pump (10), sorption type heat pump (7), lithium bromide refrigerator (8) and water water-to-water heat exchanger (9).
2. power-plant waste-heat recovering device according to claim 1, it is characterized in that: described cooling water circulation pipeline (1) also passes through centrifugal heat pump (10), centrifugal heat pump (10) is arranged between sorption type heat pump (7) and lithium bromide refrigerator (8).
3. power-plant waste-heat recovering device according to claim 2, it is characterized in that: on described cooling water circulation pipeline (1), be also provided with CWR road (2), CWR road (2) is through water water-to-water heat exchanger (9), and demineralized water pipeline (5) also passes through water water-to-water heat exchanger (9); The water inlet on CWR road (2) is arranged between centrifugal heat pump (10) and lithium bromide refrigerator (8), and the water return outlet of CWR road (2) is arranged between condenser (13) and sorption type heat pump (7).
4. power-plant waste-heat recovering device according to claim 3, it is characterized in that: described CWR road (2) is provided with CWR road circulating pump (21) and CWR road water compensating valve (22), and CWR road water compensating valve (22) is arranged on and enters on lithium bromide refrigerator (8) CWR road (2) before.
5. power-plant waste-heat recovering device according to claim 1, it is characterized in that: described steam pipework (4) is through steam turbine (41), the steam that steam turbine (41) is produced is delivered to condenser (13), steam through condenser (13) by thermal energy transfer to the cooling water in cooling water circulation pipeline (1) after solidifying water discharge.
6. power-plant waste-heat recovering device according to claim 1, is characterized in that: described inner loop pipeline (3) is provided with inner loop pipeline water compensating valve (32).
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