CN101726110A - Heatpump type gas-fired boiler waste heat recovery unit - Google Patents

Heatpump type gas-fired boiler waste heat recovery unit Download PDF

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CN101726110A
CN101726110A CN200910238452A CN200910238452A CN101726110A CN 101726110 A CN101726110 A CN 101726110A CN 200910238452 A CN200910238452 A CN 200910238452A CN 200910238452 A CN200910238452 A CN 200910238452A CN 101726110 A CN101726110 A CN 101726110A
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heat
gas
heat exchanger
water
flue gas
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CN101726110B (en
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赵玺灵
付林
张世钢
李岩
江亿
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Beijing Thupdi Planning Design Institute Co ltd
Tsinghua University
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Beijing Huaneng Ruitong Technology Development Co ltd
Tsinghua 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]
    • 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]
    • Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
    • 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

本发明属于能源技术应用领域，特别涉及一种热泵型燃气锅炉余热回收机组。该机组由吸收式热泵、烟气-水换热器、烟气冷凝换热器以及各种连接管路和附件组成；所述连接管路系统分为一次侧管路、中间水环路和二次侧管路三部分；一次侧天然气进入吸收式热泵的发生器作为驱动热源后与燃气锅炉的排烟依次进入烟气-水换热器、烟气冷凝换热器，首先通过烟气-水换热器的水侧环路加热二次侧热水回水，其次通过烟气冷凝换热器的中间水环路将热量换到吸收式热泵的蒸发器侧作为低位热源，通过吸收式热泵将热量送至二次侧热网。本发明将烟气的热量进行梯级利用，可大幅度降低排烟温度，提高了能源利用效率。其主要用在供热系统中对燃气锅炉烟气余热的回收上。

Figure 200910238452

The invention belongs to the application field of energy technology, in particular to a heat pump type gas boiler waste heat recovery unit. The unit is composed of an absorption heat pump, a flue gas-water heat exchanger, a flue gas condensing heat exchanger, and various connecting pipelines and accessories; the connecting pipeline system is divided into a primary side pipeline, an intermediate water loop and a secondary There are three parts in the secondary side pipeline; the natural gas on the primary side enters the generator of the absorption heat pump as the driving heat source, and then enters the flue gas-water heat exchanger and the flue gas condensation heat exchanger in turn with the exhaust gas of the gas boiler, and first passes through the flue gas-water The water side loop of the heat exchanger heats the hot water return water on the secondary side, and then through the intermediate water loop of the flue gas condensing heat exchanger, the heat is exchanged to the evaporator side of the absorption heat pump as a low-level heat source. The heat is sent to the secondary side heating network. The invention utilizes the heat of the flue gas in steps, can greatly reduce the temperature of the exhaust gas, and improves the energy utilization efficiency. It is mainly used in the recovery of waste heat from gas boiler flue gas in the heating system.

Figure 200910238452

Description

热泵型燃气锅炉余热回收机组 Heat pump gas boiler waste heat recovery unit

技术领域technical field

本发明属于能源技术应用领域，特别涉及一种能够大幅度降低排烟温度的热泵型燃气锅炉余热回收机组。The invention belongs to the application field of energy technology, and in particular relates to a heat pump type gas boiler waste heat recovery unit capable of greatly reducing exhaust gas temperature.

背景技术Background technique

目前，燃气锅炉的排烟温度约在100℃以上，这部分烟气中不但带走了大部分显热、同时其潜热也没有得到充分的利用，这是因为排烟温度受到用户处热要求的限制，利用常规的换热方式无法实现烟气冷凝热的全部回收，因此，如何进一步降低排烟温度，实现能源的梯级利用，实现节能减排效果，具有重要意义。At present, the exhaust gas temperature of gas-fired boilers is above 100°C. This part of the flue gas not only takes away most of the sensible heat, but also does not fully utilize its latent heat. This is because the exhaust gas temperature is determined by the thermal requirements of the user. Therefore, how to further reduce the exhaust gas temperature, realize the cascade utilization of energy, and realize the effect of energy saving and emission reduction is of great significance.

发明内容Contents of the invention

为了解决现有技术中的不足，本发明特别提供一种能够大幅度降低排烟温度的热泵型燃气锅炉余热回收机组。In order to solve the deficiencies in the prior art, the present invention particularly provides a heat pump type gas boiler waste heat recovery unit capable of greatly reducing exhaust gas temperature.

本发明的技术方案如下：Technical scheme of the present invention is as follows:

一种热泵型燃气锅炉余热回收机组，由吸收式热泵(1)、烟气冷凝换热器(2)、烟气-水换热器(3)以及各种连接管路和附件组成；所述连接管路系统分为一次侧管路、中间水环路和二次侧管路三部分，一次侧管路中的介质为燃气及其燃烧后产生的烟气，中间水环路和二次侧管路中的介质为水。其结构特点是：一次侧管路的燃气依次经过吸收式热泵(1)的发生器、烟气-水换热器(3)、烟气冷凝换热器(2)；中间环路的水依次经过烟气冷凝换热器(2)和吸收式热泵(1)的蒸发器；二次侧管路的热水采用两路并联连接的方式，一路经过吸收式热泵(1)的吸收器和冷凝器升温，另一路经过烟气-水换热器(3)被加热。具体来说，对于一次侧管路系统，燃气首先作为驱动热源进入吸收式热泵(1)的发生器中放热，降温后与燃气锅炉的排烟共同进入烟气-水换热器(3)，作为热源加热热水回水，降温后从烟气-水换热器(3)排出，然后进入烟气冷凝换热器(2)，作为热源加热中间水环路，中间水环路的热水进入吸收式热泵(1)的蒸发器作为热泵的低位热源，降温后再被烟气冷凝换热器(2)加热；对于二次侧水路系统，热水回水一路进入吸收式热泵(1)的吸收器和冷凝器吸热升温，另一路进入烟气-水换热器(3)的水侧，升温后送出至用户处。A heat pump type gas boiler waste heat recovery unit is composed of an absorption heat pump (1), a flue gas condensation heat exchanger (2), a flue gas-water heat exchanger (3), and various connecting pipelines and accessories; The connecting pipeline system is divided into three parts: the primary side pipeline, the intermediate water loop and the secondary side pipeline. The medium in the primary side pipeline is gas and the flue gas generated after combustion. The medium in the pipeline is water. Its structural features are: the gas in the primary side pipeline passes through the generator of the absorption heat pump (1), the flue gas-water heat exchanger (3), and the flue gas condensation heat exchanger (2); the water in the intermediate loop sequentially After passing through the flue gas condensation heat exchanger (2) and the evaporator of the absorption heat pump (1); the hot water in the secondary side pipeline is connected in two parallel ways, and one path passes through the absorber and condensation of the absorption heat pump (1) The device is heated up, and the other path is heated through the flue gas-water heat exchanger (3). Specifically, for the primary side pipeline system, the gas first enters the generator of the absorption heat pump (1) as a driving heat source to dissipate heat, and after cooling down, it enters the flue gas-water heat exchanger (3) together with the exhaust gas from the gas-fired boiler , used as a heat source to heat the hot water return water, after cooling down, it is discharged from the flue gas-water heat exchanger (3), and then enters the flue gas condensation heat exchanger (2), used as a heat source to heat the intermediate water loop, and the heat in the intermediate water loop The water enters the evaporator of the absorption heat pump (1) as the low-level heat source of the heat pump, and is then heated by the flue gas condensation heat exchanger (2) after cooling down; for the secondary side water system, the hot water returns all the way to the absorption heat pump (1 ) absorber and condenser heat up, and the other way enters the water side of the flue gas-water heat exchanger (3), and sends it to the user after heating up.

本发明的机组管路可有四种连接方式：第一种连接方式如图1所示，二次侧管路采用并联的方式，即二次侧热水回水分两路分别进入吸收式热泵和烟气-水换热器加热升温后，再汇合到一处输送到用户；第二种连接方式如图2所示，二次侧管路采用串联的方式，即二次侧热水回水先进入吸收式热泵吸热升温，再进入烟气-水换热器加热升温，然后再输送到用户；第三种连接方式如图3所示，一次侧管路燃气进入吸收式热泵的发生器排出后，可以不经过烟气-水换热器，直接进入烟气冷凝换热器中，对于二次侧水路系统，热水回水在吸收式热泵中吸热升温后送出至用户；第四种连接方式如图4所示，系统中增设一个烟气冷凝换热器(2a)，一次侧管路燃气进入吸收式热泵的发生器，产生烟气后，直接进入烟气冷凝换热器(2)中降温排出机组，同时燃气锅炉的排烟直接进入烟气冷凝换热器(2a)降温后排出机组，可以实现两部分烟气余热的分别回收；对于中间水环路，两个烟气冷凝换热器水侧环路共同为吸收式热泵的蒸发器提供热量。The unit piping of the present invention can have four connection modes: the first connection mode is shown in Figure 1, and the secondary side pipeline adopts a parallel connection mode, that is, the secondary side hot water return water enters the absorption heat pump and the After the flue gas-water heat exchanger is heated up, it will be merged to one place and transported to the user; the second connection method is shown in Figure 2, and the secondary side pipelines are connected in series, that is, the secondary side hot water returns first. The absorption heat pump absorbs heat and heats up, then enters the flue gas-water heat exchanger to heat up, and then transports it to the user; the third connection method is shown in Figure 3, the primary side pipeline gas enters the generator of the absorption heat pump and is discharged , can directly enter the flue gas condensing heat exchanger without passing through the flue gas-water heat exchanger. For the secondary side water system, the hot water returns to the user after absorbing heat in the absorption heat pump; the fourth connection The method is shown in Figure 4. A flue gas condensing heat exchanger (2a) is added to the system, and the gas in the primary side pipeline enters the generator of the absorption heat pump. After generating flue gas, it directly enters the flue gas condensing heat exchanger (2) At the same time, the exhaust gas from the gas boiler directly enters the flue gas condensing heat exchanger (2a) to cool down and then discharges out of the unit, so that the waste heat of the two parts of the flue gas can be recovered separately; for the intermediate water loop, the two flue gas condensing exchangers Together, the water side loops of the heaters provide heat to the evaporator of the absorption heat pump.

本发明采用的上述连接形式所构成的换热机组，也可以应用于其他工业气体余热深度回收，为低品位气体热能甚至废热余热创造了条件，实现了能源的梯级利用，同时减少了污染物排放量。The heat exchange unit composed of the above connection forms adopted in the present invention can also be applied to the deep recovery of waste heat of other industrial gases, creating conditions for low-grade gas heat energy and even waste heat waste heat, realizing the cascade utilization of energy, and reducing pollutant emissions at the same time quantity.

附图说明Description of drawings

图1为本发明第一种连接方式流程示意图。Fig. 1 is a schematic flow chart of the first connection mode of the present invention.

图2为本发明第二种连接方式流程示意图。Fig. 2 is a schematic flow chart of the second connection mode of the present invention.

图3为本发明第三种连接方式流程示意图。Fig. 3 is a schematic flow chart of the third connection mode of the present invention.

图4为本发明第四种连接方式流程示意图。Fig. 4 is a schematic flow chart of the fourth connection mode of the present invention.

图中标号：1-吸收式热泵机组，2和2a-烟气冷凝换热器，3-烟气-水换热器，a-一次侧燃气管路，b-一次侧燃气锅炉排烟管路，c-烟气出口，d-二次侧热水回水管路，e-二次侧热水供水管路。Labels in the figure: 1-absorption heat pump unit, 2 and 2a-flue gas condensation heat exchanger, 3-flue gas-water heat exchanger, a-primary gas pipeline, b-primary gas boiler exhaust pipeline , c- flue gas outlet, d- secondary side hot water return pipeline, e- secondary side hot water supply pipeline.

具体实施方式Detailed ways

下面根据一个供热系统实际供热参数的要求，对本发明的具体实施方式进行说明。The specific implementation of the present invention will be described below according to the requirements of actual heating parameters of a heating system.

实施例1：参看附图1，实际运行中，天然气首先作为驱动热源进入吸收式热泵机组1，在其发生器中放热，降温至130℃左右时从吸收式热泵1中排出，与燃气锅炉的排烟共同进入烟气-水换热器3作为加热热源，降温至70℃后，从气-水换热器中排出，70℃的烟气进入烟气冷凝换热器2降温至30℃后排出；二次侧45℃的热水回水分两路进入机组，一路进入吸收式热泵1，在其吸收器和冷凝器中吸收热量，被加热到60℃左右后流出，另一路进入烟气-水换热器3，与一次侧烟气进行换热，被加热到60℃后流出，两路60℃的热水出水汇合后送到用户。Embodiment 1: Referring to the accompanying drawing 1, in actual operation, natural gas first enters the absorption heat pump unit 1 as a driving heat source, releases heat in its generator, and discharges it from the absorption heat pump 1 when the temperature drops to about 130°C, and is connected with the gas-fired boiler The exhaust smoke enters the flue gas-water heat exchanger 3 together as a heating heat source, and after cooling down to 70°C, it is discharged from the air-water heat exchanger, and the flue gas at 70°C enters the flue gas condensation heat exchanger 2 to cool down to 30°C Then discharge; the hot water return water at 45°C on the secondary side enters the unit in two ways, one way enters the absorption heat pump 1, absorbs heat in its absorber and condenser, and flows out after being heated to about 60°C, and the other way enters the flue gas - The water heat exchanger 3 exchanges heat with the flue gas on the primary side, and flows out after being heated to 60°C, and the two hot water outlets at 60°C are combined and sent to the user.

实施例2：参看附图2，天然气首先作为驱动热源进入吸收式热泵机组1，在其发生器中放热，降温至130℃左右时从吸收式热泵1中排出，与燃气锅炉的排烟共同进入烟气-水换热器3作为加热热源，降温至70℃后，从气-水换热器中排出，70℃的烟气进入烟气冷凝换热器2降温至30℃后排出；二次侧45℃的热水回水进入吸收式热泵1，在其吸收器和冷凝器中吸收热量，被加热后再进入气-水换热器2，与一次侧烟气进行换热，被加热到60℃后送到用户。Embodiment 2: Referring to accompanying drawing 2, natural gas first enters the absorption heat pump unit 1 as a driving heat source, releases heat in its generator, and is discharged from the absorption heat pump 1 when the temperature drops to about 130°C, and is combined with the exhaust gas of the gas-fired boiler. Enter the flue gas-water heat exchanger 3 as a heating heat source, after cooling to 70°C, it is discharged from the gas-water heat exchanger, and the flue gas at 70°C enters the flue gas condensation heat exchanger 2 and is discharged after cooling to 30°C; The hot water return water at 45°C on the secondary side enters the absorption heat pump 1, absorbs heat in its absorber and condenser, is heated and then enters the air-water heat exchanger 2, exchanges heat with the flue gas on the primary side, and is heated After reaching 60°C, send it to the user.

实施例3：参看附图3，实际运行中，天然气首先作为驱动热源进入吸收式热泵机组1，在其发生器中放热，烟气从吸收式热泵1中排出，与燃气锅炉的90℃排烟共同进入烟气冷凝换热器2降温至30℃后排出；二次侧45℃的热水回水进入吸收式热泵1，被加热到60℃后送到用户。Embodiment 3: Referring to the accompanying drawing 3, in actual operation, natural gas first enters the absorption heat pump unit 1 as a driving heat source, releases heat in its generator, and the flue gas is discharged from the absorption heat pump 1, and is connected with the 90°C exhaust gas of the gas-fired boiler. The smoke enters the flue gas condensing heat exchanger 2 to cool down to 30°C and then is discharged; the hot water return water at 45°C on the secondary side enters the absorption heat pump 1, is heated to 60°C and then sent to the user.

实施例4：参看附图4，系统增设一个烟气冷凝换热器2a，实际运行中，天然气首先作为驱动热源进入吸收式热泵机组1，在其发生器中放热，降温至130℃左右时从吸收式热泵1中排出，进入烟气冷凝换热器2中后排出；燃气锅炉的排烟直接进入烟气冷凝换热器2a降温后排出；二次侧45℃的热水回水进入吸收式热泵1，被加热到60℃后送到用户。Embodiment 4: Referring to accompanying drawing 4, a flue gas condensation heat exchanger 2a is added to the system. In actual operation, natural gas first enters the absorption heat pump unit 1 as a driving heat source, releases heat in its generator, and cools down to about 130°C Exhaust from the absorption heat pump 1, enter the flue gas condensing heat exchanger 2 and then discharge; the exhaust gas from the gas boiler directly enters the flue gas condensing heat exchanger 2a to cool down and then discharge; the hot water return water at 45°C on the secondary side enters the absorption Type heat pump 1, after being heated to 60°C, it is sent to the user.

Claims (5)

1. pump type heat gas fired-boiler waste heat recovery unit, described unit is by absorption heat pump (1), flue gas condensing heat exchanger (2), gas-water heat exchanger (3) and various connecting line and annex are formed, it is characterized in that: combustion gas at first enters heat release in the generator of absorption heat pump (1) as driving heat source in this unit, the cooling back enters gas-water heat exchanger (3) jointly with the smoke evacuation of gas fired-boiler, as the heating thermal source, the heat hot water backwater, discharge from gas-water heat exchanger (3) the cooling back, enter flue gas condensing heat exchanger (2), as the hot water of heating thermal source heating intermediate loop; The hot water of intermediate loop directly enters the low level heat energy of the evaporimeter of absorption heat pump (1) as heat pump, is heated by flue gas condensing heat exchanger (2) after the cooling again; For the secondary side water circuit system, the hot water backwater delivers to the user after absorbing heat and heating up in absorption heat pump (1) and gas-water heat exchanger (3); Described connecting line system is divided into primary side pipeline, middle water loops and secondary side pipeline three parts; The flue gas of primary side pipeline passes through gas-water heat exchanger (3), flue gas condensing heat exchanger (2) successively; The water of intermediate loop passes through the evaporimeter of flue gas condensing heat exchanger (2) and absorption heat pump (1) successively; The absorber of the hot water process absorption heat pump (1) of secondary side pipeline and condenser, gas-water heat exchanger (3).
2. pump type heat gas fired-boiler waste heat recovery unit according to claim 1, it is characterized in that: the part in the high-temperature medium (steam or hot water) that described gas fired-boiler produces enters heat release in the generator of absorption heat pump (1) as driving heat source, return boiler after the cooling; The smoke evacuation of gas fired-boiler enters gas-water heat exchanger (3), as the heating thermal source, the heat hot water backwater, discharge from gas-water heat exchanger (3) the cooling back, enter flue gas condensing heat exchanger (2), as the hot water of heating thermal source heating intermediate loop, the hot water of intermediate loop directly enters the low level heat energy of the evaporimeter of absorption heat pump (1) as heat pump, is heated by flue gas condensing heat exchanger (2) after the cooling again; For the secondary side water circuit system, the hot water backwater delivers to the user after absorbing heat and heating up in absorption heat pump (1) and gas-water heat exchanger (3).
3. pump type heat gas fired-boiler waste heat recovery unit according to claim 1 and 2, it is characterized in that: described secondary side pipeline adopts mode in parallel or series connection, adopting mode in parallel is after the secondary side hot water backwater divides two-way to enter absorption heat pump (1) and gas-water heat exchanger (3) heat temperature raising respectively, to converge to a place again and be transported to the user; The mode that adopts series connection is that the secondary side hot water backwater is introduced into gas-water heat exchanger (3) and enters absorption heat pump (1) intensification of absorbing heat step by step again, perhaps being introduced into absorption heat pump (1) heat absorption heats up, enter gas-water heat exchanger (3) heat temperature raising again, be transported to the user.
4. pump type heat gas fired-boiler waste heat recovery unit according to claim 1 and 2 is characterized in that: described flue gas directly enters in the flue gas condensing heat exchanger (2); For the secondary side water circuit system, the hot water backwater sends to the user after absorbing heat in absorption heat pump (1) and heating up.
5. pump type heat gas fired-boiler waste heat recovery unit according to claim 1 and 2, it is characterized in that: described unit is set up a flue gas condensing heat exchanger (2a), the combustion gas of primary side pipeline enters the generator of absorption heat pump (1), after producing flue gas, directly enter cooling discharge unit in the flue gas condensing heat exchanger (2); The smoke evacuation of gas fired-boiler simultaneously directly enters flue gas condensing heat exchanger (2a) cooling back and discharges unit, realizes the recovery respectively of two parts fume afterheat.
CN2009102384522A 2009-11-20 2009-11-20 Heatpump type gas-fired boiler waste heat recovery unit Expired - Fee Related CN101726110B (en)

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