CN205560932U - Cold junction waste heat cascade utilization heating system - Google Patents
Cold junction waste heat cascade utilization heating system Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 60
- 239000002918 waste heat Substances 0.000 title abstract description 14
- 239000000498 cooling water Substances 0.000 claims abstract description 90
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
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- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 7
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- 238000010248 power generation Methods 0.000 description 3
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- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
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- 238000005272 metallurgy Methods 0.000 description 2
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- 239000004566 building material Substances 0.000 description 1
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Abstract
一种冷端余热梯级利用供热系统，包括汽轮机、凝汽器、热泵单元、温度调节单元，从汽轮机引出驱动蒸汽管路连接至热泵单元，热泵单元连接至循环冷却水管路，与凝汽器组成闭式循环系统，从热泵流出的循环冷却水进入凝汽器进行一次加热；温度调节单元对进入热泵的热网水和循环冷却水进行温度调节补偿，使热泵机组回收电厂冷端余热能力最大化，拓展了热泵在北方部分寒冷地区电厂的应用。
A heat supply system for cascade utilization of waste heat at the cold end, including a steam turbine, a condenser, a heat pump unit, and a temperature adjustment unit. A closed circulation system is formed. The circulating cooling water flowing out of the heat pump enters the condenser for primary heating; the temperature adjustment unit performs temperature adjustment and compensation on the heating network water and circulating cooling water entering the heat pump, so that the heat pump unit can maximize the waste heat recovery capacity of the cold end of the power plant. It has expanded the application of heat pumps in power plants in some cold northern regions.
Description
技术领域technical field
本实用新型属于电厂节能领域，具体涉及一种冷端余热利用系统The utility model belongs to the field of power plant energy saving, in particular to a cold end waste heat utilization system
背景技术Background technique
煤炭是我国主要的一次能源(占一次能源消费的比重2014年为64.2％，2015年预计为63.3％)，主要集中在火电、冶金和建材行业。火电机组是我国的主力发电机组，其装机容量占电力总装机容量的73％左右，发电量占总发电量的比例超过80％。因而降低火电机组的煤炭消耗，提高电厂效率，对我国的节能减排具有重要意义。Coal is the main primary energy source in my country (accounting for 64.2% of primary energy consumption in 2014 and expected to be 63.3% in 2015), mainly concentrated in thermal power, metallurgy and building materials industries. Thermal power units are the main power generation units in my country, and their installed capacity accounts for about 73% of the total installed capacity of electric power, and their power generation accounts for more than 80% of the total power generation. Therefore, reducing the coal consumption of thermal power units and improving the efficiency of power plants is of great significance to my country's energy saving and emission reduction.
热泵是一种利用高品位热能作为驱动能源，回收低品位热能用于供热或升温的设备，被广泛应用于电厂、石油、化工和冶金等领域。在电厂的热功转换过程中不可避免地存在固有的冷源损失，现代发电厂循环热效率为40％～57％。采用热泵回收热电厂的循环水/乏汽冷端低温余热，可以提高电厂的热经济性，具有显著的节能效果。A heat pump is a device that uses high-grade heat energy as a driving energy and recovers low-grade heat energy for heating or heating. It is widely used in power plants, petroleum, chemical and metallurgy and other fields. In the heat power conversion process of the power plant, there is inevitably an inherent cold source loss, and the cycle heat efficiency of a modern power plant is 40% to 57%. The use of heat pumps to recover the low-temperature waste heat at the cold end of circulating water/vapor steam in thermal power plants can improve the thermal economy of the power plant and have a significant energy-saving effect.
合适的低温热源是决定热泵应用的关键因素之一。北方地区冬季供暖的特点是：不同供暖期的室外温度变化较大且昼夜温差较大，需要对一次热网的供回水温度进行频繁调整，同时电厂自身的循环冷却水温也变化较大，使热泵的实际回收余热量、加热出水温度受到较大影响。特别是到了严寒期，热网回水温度处于极高值，循环冷却水温度处于极低值，均极大的影响了热泵的制热性能。热泵在使用过程中需要对COP性能曲线进行试验修正。A suitable low-temperature heat source is one of the key factors in determining the application of a heat pump. The characteristics of heating in winter in the northern region are: the outdoor temperature changes greatly in different heating periods and the temperature difference between day and night is large. It is necessary to frequently adjust the temperature of the supply and return water of the primary heating network. At the same time, the circulating cooling water temperature of the power plant itself also changes greatly. The actual recovery of waste heat of the heat pump and the temperature of the heated water are greatly affected. Especially in the severe cold period, the return water temperature of the heating network is at an extremely high value, and the circulating cooling water temperature is at an extremely low value, which greatly affects the heating performance of the heat pump. During the use of the heat pump, the COP performance curve needs to be corrected experimentally.
目前电厂仅依靠改变凝汽器循环冷却水流量来间接调节循环冷却水温度，受制于机组效率和设备性能要求，该调节方式的作用很有限，且主要是为了调整机组出力，而不是为了保障热泵辅机供热性能。此外，在北方的部分地区，由于冬季循环冷却水温度过低，热泵根本无法工作，很大程度上影响了其使用推广。At present, power plants only rely on changing the circulating cooling water flow rate of the condenser to indirectly adjust the circulating cooling water temperature. Due to the efficiency of the unit and the performance requirements of the equipment, the effect of this adjustment method is very limited, and it is mainly to adjust the output of the unit rather than to protect the heat pump. Auxiliary heating performance. In addition, in some areas in the north, due to the low temperature of the circulating cooling water in winter, the heat pump cannot work at all, which greatly affects the promotion of its use.
实用新型内容Utility model content
本实用新型的目的在于提供一种合理利用电厂冷端(循环水/乏汽)余热，提高能源利用效率，实现电厂节能降耗的冷端余热利用系统。The purpose of the utility model is to provide a cold-end waste heat utilization system that reasonably utilizes the waste heat at the cold end (circulating water/exhaust steam) of the power plant, improves energy utilization efficiency, and realizes energy saving and consumption reduction of the power plant.
为了实现上述目的，本实用新型的技术方案是：一种冷端余热梯级利用供热系统，包括汽轮机、凝汽器、热泵单元、温度调节单元，汽轮机排气进入凝汽器，在凝汽器中与循环冷却水进行热交换；其特征在于，从汽轮机引出驱动蒸汽管路连接至热泵单元，热泵单元连接至循环冷却水管路，与凝汽器组成闭式循环系统，从热泵流出的循环冷却水进入凝汽器进行一次加热；热泵单元还连接供热热网。In order to achieve the above purpose, the technical solution of the present invention is: a heat supply system for cascade utilization of waste heat at the cold end, including a steam turbine, a condenser, a heat pump unit, and a temperature adjustment unit. heat exchange with the circulating cooling water; it is characterized in that the driving steam pipeline drawn from the steam turbine is connected to the heat pump unit, and the heat pump unit is connected to the circulating cooling water pipeline to form a closed circulation system with the condenser, and the circulating cooling water flowing out of the heat pump Water enters the condenser for primary heating; the heat pump unit is also connected to the heating network.
进一步地，热泵单元具有循环冷却水进口和循环冷却水出口，分别通过管路连接至凝汽器下游侧的循环冷却水管和凝汽器上游侧的循环冷却水管，与凝汽器组成闭式循环系统。Further, the heat pump unit has a circulating cooling water inlet and a circulating cooling water outlet, which are respectively connected to the circulating cooling water pipe on the downstream side of the condenser and the circulating cooling water pipe on the upstream side of the condenser through pipelines, forming a closed cycle with the condenser system.
进一步地，包括第一温度调节单元，第一温度调节单元以旁路方式连接至热泵单元的一次热网水管，可对流入的一次热网水进行温度调节；Further, a first temperature adjustment unit is included, the first temperature adjustment unit is connected to the water pipe of the primary heating network of the heat pump unit in a bypass manner, and can adjust the temperature of the inflowing primary heating network water;
进一步地，包括第二温度调节单元，第二温度调节单元以旁路方式连接至热泵单元的循环冷却水管，可对流入的循环冷却水进行温度调节。Further, a second temperature adjustment unit is included, the second temperature adjustment unit is connected to the circulating cooling water pipe of the heat pump unit in a bypass manner, and can adjust the temperature of the inflowing circulating cooling water.
进一步地，第一温度调节单元、第二温度调节单元可设置为一整体单元，用于流入的一次热网水和循环冷却水之间进行热量交换。Further, the first temperature adjustment unit and the second temperature adjustment unit may be set as an integral unit for heat exchange between the incoming primary heating network water and the circulating cooling water.
进一步地，第一温度调节单元、第二温度调节单元设置为一整体单元，采用水-水换热器，用于流入的一次热网回水和循环冷却水之间进行热量交换。Furthermore, the first temperature adjustment unit and the second temperature adjustment unit are configured as an integral unit, and a water-water heat exchanger is used for heat exchange between the incoming primary heating network return water and circulating cooling water.
进一步地，第一温度调节单元通过热网回水进水支管和热网回水出水支管以旁路方式连接至热泵单元的一次热网回水管；第二温度调节单元通过循环冷却水进水支管和循环冷却水出水支管以旁路方式连接至热泵单元的循环冷却水进口管。Further, the first temperature adjustment unit is connected to the primary heat network return pipe of the heat pump unit in a bypass manner through the heat network return water inlet branch pipe and the heat network return water outlet branch pipe; the second temperature adjustment unit is connected to the primary heat network return water pipe through the circulating cooling water inlet branch pipe and the circulating cooling water outlet branch pipe are connected to the circulating cooling water inlet pipe of the heat pump unit in a bypass manner.
进一步地，在循环冷却水进水支管和循环冷却水出水支管之间的循环冷却水进口管上安装有循环冷却水调节阀；在热网回水进水支管上安装有热网水调节阀，在循环冷却水进水支管上安装有循环冷却水调节阀。Further, a circulating cooling water regulating valve is installed on the circulating cooling water inlet pipe between the circulating cooling water inlet branch pipe and the circulating cooling water outlet branch pipe; a heating network water regulating valve is installed on the heating network return water inlet branch pipe, A circulating cooling water regulating valve is installed on the circulating cooling water inlet branch pipe.
本实用新型依据能源梯级利用的原理，能够有效调节和避免热网回水、循环冷却水的温度波动偏离设计值，保障热泵平稳安全运行，使热泵机组回收电厂冷端余热能力最大化。同时在一定程度上消除了低温天气对热泵应用的限制，拓展了热泵在北方部分寒冷地区电厂的应用。Based on the principle of cascade utilization of energy, the utility model can effectively adjust and avoid the temperature fluctuation of the return water of the heating network and the circulating cooling water from deviating from the design value, ensure the stable and safe operation of the heat pump, and maximize the capacity of the heat pump unit to recover the waste heat from the cold end of the power plant. At the same time, to a certain extent, it eliminates the restrictions on the application of heat pumps in low temperature weather, and expands the application of heat pumps in power plants in some cold northern regions.
附图说明Description of drawings
图1是供热系统结构示意图；Figure 1 is a schematic diagram of the structure of the heating system;
其中1汽轮机，2冷却塔，3凝汽器，4热泵，5一次热网回水，6一次热网供水，7驱动蒸汽，8凝结水，9热泵进口循环冷却水，10热泵出口循环冷却水，11循环冷却水循环水泵，12水-水换热器，13循环冷却水调节阀，14循环冷却水调节阀，15热网水调节阀Among them, 1 steam turbine, 2 cooling tower, 3 condenser, 4 heat pump, 5 primary heat network return water, 6 primary heat network water supply, 7 drive steam, 8 condensate water, 9 heat pump inlet circulating cooling water, 10 heat pump outlet circulating cooling water , 11 circulating cooling water circulating pump, 12 water-water heat exchanger, 13 circulating cooling water regulating valve, 14 circulating cooling water regulating valve, 15 heating network water regulating valve
具体实施方式detailed description
下面结合附图1对本实用新型作进一步描述，应当理解，此处所描述的内容仅用于说明和解释本实用新型，并不用于限定本实用新型。The utility model will be further described below in conjunction with accompanying drawing 1, and it should be understood that the content described here is only for illustrating and explaining the utility model, and is not intended to limit the utility model.
本实用新型中的供热系统包括汽轮机1、冷却塔2、凝汽器3，汽轮机排气进入凝汽器，在凝汽器中循环冷却水进行热交换，吸热升温后的循环冷却水进入冷却塔进行冷却降温，并循环流入凝汽器。供热系统还进一步包括热泵单元，热泵单元可采用蒸汽驱动的吸收式热泵，也可用于蒸汽驱动的压缩式热泵等。从汽轮机1引出驱动蒸汽管路连接至热泵单元。热泵单元具有循环冷却水进口和循环冷却水出口，分别通过管路连接至凝汽器下游侧的循环冷却水管和凝汽器上游侧的循环冷却水管，与凝汽器组成闭式循环系统，从热泵流出的循环冷却水进入凝汽器进行一次加热。热泵单元还具有一次热网回水进口和一次热网供水出口，分别连接热网回水管和热网供水管。The heating system in the utility model includes a steam turbine 1, a cooling tower 2, and a condenser 3. The exhaust gas of the steam turbine enters the condenser, and the circulating cooling water in the condenser performs heat exchange, and the circulating cooling water after heat absorption and heating enters the condenser. The cooling tower cools down and circulates into the condenser. The heat supply system further includes a heat pump unit, and the heat pump unit may be a steam-driven absorption heat pump or a steam-driven compression heat pump. The driving steam pipeline drawn from the steam turbine 1 is connected to the heat pump unit. The heat pump unit has a circulating cooling water inlet and a circulating cooling water outlet, which are respectively connected to the circulating cooling water pipe on the downstream side of the condenser and the circulating cooling water pipe on the upstream side of the condenser through pipelines, forming a closed circulation system with the condenser. The circulating cooling water flowing out of the heat pump enters the condenser for primary heating. The heat pump unit also has a return water inlet of the primary heating network and a water supply outlet of the primary heating network, which are respectively connected to the return water pipe of the heating network and the water supply pipe of the heating network.
供热系统还进一步包括第一温度调节单元、第二温度调节单元，第一温度调节单元通过热网回水进水支管和热网回水出水支管以旁路方式连接至热泵单元的一次热网回水管，可对流入的一次热网回水进行温度调节；第二温度调节单元通过循环冷却水进水支管和循环冷却水出水支管以旁路方式连接至热泵单元的循环冷却水进口管，可对流入的循环冷却水进行温度调节。The heating system further includes a first temperature adjustment unit and a second temperature adjustment unit. The first temperature adjustment unit is connected to the primary heat network of the heat pump unit in a bypass manner through the heat network return water inlet branch pipe and the heat network return water outlet branch pipe. The return pipe can adjust the temperature of the return water flowing into the primary heating network; the second temperature adjustment unit is connected to the circulating cooling water inlet pipe of the heat pump unit in a bypass manner through the circulating cooling water inlet branch pipe and the circulating cooling water outlet branch pipe, which can Adjust the temperature of the incoming circulating cooling water.
第一温度调节单元、第二温度调节单元可设置为一整体单元，进一步可采用水-水换热器，用于流入的一次热网回水和循环冷却水之间进行热量交换。The first temperature adjustment unit and the second temperature adjustment unit can be set as an integral unit, and a water-water heat exchanger can be used for heat exchange between the incoming primary heating network return water and circulating cooling water.
在循环冷却水进水支管和循环冷却水出水支管之间的循环冷却水进口管上安装有循环冷却水调节阀；在热网回水进水支管上安装有热网水调节阀，在循环冷却水进水支管上安装有循环冷却水调节阀。通过三个调节阀的开度合理调整，可实现工况转换调节A circulating cooling water regulating valve is installed on the circulating cooling water inlet pipe between the circulating cooling water inlet branch pipe and the circulating cooling water outlet branch pipe; a heating network water regulating valve is installed on the heating network return water inlet branch pipe. A circulating cooling water regulating valve is installed on the water inlet branch pipe. Through the reasonable adjustment of the opening of the three regulating valves, the conversion and adjustment of working conditions can be realized
从热泵流出的循环冷却水通过水-水换热器，利用热网回水进行二次梯级加热。调节进入热泵的热网水、循环冷却水温度The circulating cooling water flowing out of the heat pump passes through the water-water heat exchanger, and uses the return water of the heat network for secondary cascade heating. Adjust the temperature of the heating network water and circulating cooling water entering the heat pump
在供热系统运行时，When the heating system is running,
从汽轮机1抽取一定压力的驱动蒸汽7进入热泵4，放热后冷凝为凝结水8。The driving steam 7 with a certain pressure is extracted from the steam turbine 1 and enters the heat pump 4, where it is condensed into condensed water 8 after releasing heat.
工作方式一，在初、末寒期室外循环冷却水温度初步下降时：Working method 1, when the temperature of the outdoor circulating cooling water initially drops during the early and late cold seasons:
循环冷却水调节阀13开启，循环冷却水调节阀14和热网水调节阀15关闭。The circulating cooling water regulating valve 13 is opened, and the circulating cooling water regulating valve 14 and the heating network water regulating valve 15 are closed.
凝汽器3出口的循环冷却水抽取一部分通过循环冷却水调节阀13进入热泵4，其余直接进入冷却塔2进行换热降温。Part of the circulating cooling water at the outlet of the condenser 3 enters the heat pump 4 through the circulating cooling water regulating valve 13, and the rest directly enters the cooling tower 2 for heat exchange and cooling.
热泵出口循环冷却水10经过循环冷却水循环水泵11进入凝汽器3，与汽轮机1排出的乏汽进行换热。此时为热泵出口循环冷却水10的一次加热，水温提高约6～11℃。The circulating cooling water 10 at the outlet of the heat pump enters the condenser 3 through the circulating cooling water circulating water pump 11 , and exchanges heat with exhaust steam discharged from the steam turbine 1 . At this time, it is a primary heating of the circulating cooling water 10 at the outlet of the heat pump, and the water temperature increases by about 6-11°C.
热泵出口循环冷却水10经一次加热后，进入热泵4放热。The circulating cooling water 10 at the outlet of the heat pump enters the heat pump 4 to release heat after being heated once.
工作方式二，在严寒期室外循环冷却水温度明显下降时：Working mode 2, when the temperature of the outdoor circulating cooling water drops significantly during the severe cold period:
循环冷却水调节阀13关闭，循环冷却水调节阀14和热网水调节阀15开启。The circulating cooling water regulating valve 13 is closed, and the circulating cooling water regulating valve 14 and the heating network water regulating valve 15 are opened.
冬季严寒期一次热网供水5经过调节后水温通常约为55～60℃。从一次热网回水5的母管中抽取一部分通过热网水调节阀15，进入水-水换热器12进行放热降温，再回到母管与原一次热网回水5混合后，进入热泵4被加热升温。The water temperature of the primary heating network water supply 5 is usually about 55-60°C after adjustment in the severe winter period. A part is extracted from the main pipe of the primary heating network return water 5, passes through the heating network water regulating valve 15, enters the water-water heat exchanger 12 to release heat and cool down, and then returns to the main pipe to mix with the original primary heating network return water 5, Enter the heat pump 4 to be heated up.
热泵出口循环冷却水10经过循环冷却水循环水泵11进入凝汽器3进行一次加热后，一部分直接进入冷却塔2减温，余下进入水-水换热器12被一次热网供水5。加热进行二次梯级加热升温，再进入热泵4。一次热网供水5和循环冷却水温差约为25～40℃左右。The circulating cooling water 10 at the outlet of the heat pump passes through the circulating cooling water circulating water pump 11 and enters the condenser 3 for primary heating, a part of it directly enters the cooling tower 2 for cooling, and the rest enters the water-water heat exchanger 12 to be supplied by the primary heating network 5 . Heating is carried out for second stage heating and temperature rise, and then enters the heat pump 4. The temperature difference between the primary heating network supply water 5 and the circulating cooling water is about 25-40°C.
在热泵的实际应用过程中，随着室外温度的下降，其性能随热网回水温度的上升、循环冷却水温度的下降而降低。本实用新型依据能源梯级利用的原理，能够有效调节和避免热网回水、循环冷却水的温度波动偏离设计值，保障热泵平稳安全运行，使热泵机组回收电厂冷端余热能力最大化。同时在一定程度上消除了低温天气对热泵应用的限制，拓展了热泵在北方部分寒冷地区电厂的应用。In the actual application process of the heat pump, as the outdoor temperature drops, its performance decreases with the increase of the return water temperature of the heating network and the decrease of the circulating cooling water temperature. Based on the principle of cascade utilization of energy, the utility model can effectively adjust and avoid the temperature fluctuation of the return water of the heating network and the circulating cooling water from deviating from the design value, ensure the stable and safe operation of the heat pump, and maximize the capacity of the heat pump unit to recover the waste heat from the cold end of the power plant. At the same time, to a certain extent, it eliminates the restrictions on the application of heat pumps in low temperature weather, and expands the application of heat pumps in power plants in some cold northern regions.
本供热系统不限于采用汽轮机的热电厂，也可用于燃气蒸汽联合循环机组的冷端余热利用系统；This heating system is not limited to thermal power plants using steam turbines, and can also be used in the cold end waste heat utilization system of gas-steam combined cycle units;
不限于回收循环冷却水余热的热泵系统，也可用于乏汽等冷端低温热源余热回收的热泵系统。It is not limited to heat pump systems that recover waste heat from circulating cooling water, and can also be used in heat pump systems that recover waste heat from cold-end low-temperature heat sources such as exhaust steam.
最后应说明的是：以上所述仅为本实用新型的解释，并不用于限制本实用新型，尽管对本实用新型进行了详细的说明，对于本领域的技术人员来说，其依然可以对前述所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换。凡在本实用新型的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本实用新型的保护范围之内。Finally, it should be noted that: the above is only an explanation of the utility model, and is not intended to limit the utility model. Although the utility model has been described in detail, for those skilled in the art, it can still understand the aforementioned Modifications to the technical solutions recorded, or equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105546618A (en) * | 2016-01-14 | 2016-05-04 | 大唐(北京)能源管理有限公司 | Heating system and heating method for gradient utilization for cold-end waste heat |
| CN107289491A (en) * | 2017-08-04 | 2017-10-24 | 中能信创（北京）售电有限公司 | The heating system that a kind of residual heat of condensed water is coupled with waste water residual heat |
| CN112944451A (en) * | 2021-04-15 | 2021-06-11 | 晟源高科(北京)科技有限公司 | Natural gas energy supplementing graded utilization system based on pressure isolation station and adjusting method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105546618A (en) * | 2016-01-14 | 2016-05-04 | 大唐(北京)能源管理有限公司 | Heating system and heating method for gradient utilization for cold-end waste heat |
| CN105546618B (en) * | 2016-01-14 | 2024-01-12 | 万隆新材(北京)科技有限公司 | Cascade utilization heat supply system and method for cold end waste heat |
| CN107289491A (en) * | 2017-08-04 | 2017-10-24 | 中能信创（北京）售电有限公司 | The heating system that a kind of residual heat of condensed water is coupled with waste water residual heat |
| CN112944451A (en) * | 2021-04-15 | 2021-06-11 | 晟源高科(北京)科技有限公司 | Natural gas energy supplementing graded utilization system based on pressure isolation station and adjusting method |
| CN112944451B (en) * | 2021-04-15 | 2022-05-27 | 晟源高科(北京)科技有限公司 | Natural gas energy supplementing graded utilization system based on pressure isolation station and adjusting method |
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