Thermal power plant cross-seasonal distributed heat storage and supply system

Abstract

A thermal power plant cross-seasonal distributed heat storage and supply system comprises a thermal power plant, a first-stage heat supply pipe network, a plurality of distributed heat supply units and heat consumers, and the distributed heat supply units are arranged between the first-stage heat supply pipe network and the heat consumer side; the cross-seasonal distributed heat storage and supply system for the thermal power plant solves the problem that waste heat of the thermal power plant in summer cannot be utilized on a large scale, realizes combined heat and power generation in summer and heat and winter use in summer, enhances the peak regulation flexibility of a thermal power generating unit while thermoelectricity is decoupled, meets the peak regulation requirement of new energy electric power, improves the operation efficiency of the thermal power generating unit, reduces carbon emission, and is suitable for popularization and application. A coal, gas and oil peak regulation boiler room is replaced, the heat supply area is enlarged, the income of an investor is improved, the national energy-saving and carbon-reducing action scheme is responded, and coal-electricity low-carbon transformation is promoted.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat utilization in thermal power plants, in particular to a cross-season waste heat heating system in thermal power plants. Background Art

[0002] According to the second law of thermodynamics, the heat wasted during power generation in a thermal power unit accounts for about 50% of the total heat of the unit. This waste heat can be used for heating during winter power generation, achieving winter cogeneration and achieving good economic and social benefits.

[0003] In summer, the demand for heat disappears, and the heat wasted by thermal power units can only be discharged into the atmosphere through cooling towers.

[0004] Based on this, the author of the present utility model proposes a cross-season waste heat heating system and method for a thermal power plant, in order to solve the above-mentioned technical problems, improve the economic benefits of the enterprise, and continuously promote the low-carbon transformation of coal-fired power. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the defect in the prior art that the waste heat of thermal power plants in summer cannot be utilized on a large scale, and to provide a cross-season distributed heat storage heating system for thermal power plants.

[0006] The utility model solves the above technical problems through the following technical solutions:

[0007] A cross-seasonal distributed heat storage heating system for a thermal power plant, comprising a thermal power plant, a primary heating pipe network, a plurality of distributed heating units and a heat user, wherein the plurality of distributed heating units are arranged between the primary heating pipe network and the heat user side;

[0008] The distributed heating unit includes a heat storage mechanism and a heat exchange mechanism. The thermal power plant is connected to each distributed heating unit through a two-way primary heating pipeline network for transporting heat back and forth. The primary heating pipeline network is connected to the two heat storage channels of each distributed heating unit. The heat storage channel connects one side of the heat storage mechanism. Each heat storage channel is respectively provided with a first heat storage channel valve and a second heat storage channel valve. The other side of the heat storage mechanism is connected to the two input channels of the heat exchange mechanism through two heat extraction channels for transporting heat back and forth. Each heat extraction channel is respectively provided with a first heat extraction channel valve and a second heat extraction channel valve. A hot water pump is provided between the second heat extraction channel valve and the heat storage mechanism. The two output channels of the heat exchange mechanism for transporting heat back and forth are connected to heat users. The thermal power plant is also connected to one end of the two bypass channels through two-way primary heating pipeline network for transporting heat back and forth. The other end of the bypass channel is connected to the two input channels of the heat exchange mechanism. The two bypass channels are respectively provided with a first bypass channel valve and a second bypass channel valve.

[0009] Furthermore, the heat storage mechanism is an underground water pool or an underground water tank.

[0010] A cross-seasonal distributed heat storage heating method for a thermal power plant, the specific method is as follows:

[0011] The thermal power plant provides high-temperature hot water and receives low-temperature return water;

[0012] The thermal power plant sends and recycles the high-temperature heat storage medium through the primary heating pipeline network;

[0013] The high-temperature heat storage medium flows into the heat storage mechanism through the primary heat supply pipe network, and the low-temperature heat storage medium flows out of the heat storage mechanism through the primary heat supply pipe network and is recovered by the thermal power plant. The heat storage mechanism is used to store the heat in the high-temperature hot water;

[0014] The high-temperature heat storage medium of the heat storage mechanism is transported to the heat exchange mechanism, and the heat is extracted by the heat exchange mechanism and then returned to the heat storage mechanism;

[0015] The heat user is connected to a heat exchange mechanism, and the heat exchange mechanism is used to convert the heat in the heat storage mechanism into heating hot water, and transport the heating hot water to the heat user.

[0016] Furthermore, a heat storage channel is provided between the heat storage mechanism and the primary heating network, and a first heat storage channel valve and a second heat storage channel valve are provided on the heat storage channel; a heat removal channel is provided between the heat storage mechanism and the heat exchange mechanism, and a first heat removal channel valve and a second heat removal channel valve are provided on the heat removal channel; a bypass channel is provided between the heat storage channel and the heat removal channel, and a first bypass channel valve and a second bypass channel valve are provided on the bypass channel.

[0017] Furthermore, the heat storage mechanism is an underground water pool or an underground water tank, and the location of the heat storage mechanism can be determined according to local actual conditions.

[0018] Furthermore, a hot water pump is provided between the heat storage mechanism and the heat exchange mechanism, and heat is transported to the heat exchange mechanism through the hot water pump.

[0019] The positive and progressive effects of the utility model are:

[0020] The utility model discloses a cross-seasonal distributed heat storage and heating system for thermal power plants, which solves the problem that the waste heat in thermal power plants cannot be utilized on a large scale in summer, realizes summer cogeneration and summer heat for winter use, decouples heat and electricity, and enhances the peak-shaving flexibility of thermal power units, meets the peak-shaving demand of new energy power, improves the operating efficiency of thermal power units, reduces carbon emissions, replaces coal, gas, and oil peak-shaving boiler rooms, expands the heating area, increases investors' returns, responds to the national energy conservation and carbon reduction action plan, and promotes the low-carbon transformation of coal-fired power. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0022] Figure 1 A schematic diagram of the structure of the utility model cross-seasonal distributed heat storage heating system for thermal power plants;

[0023] Figure 2 It is a schematic diagram of the structure of one of the heating users in the utility model.

[0024] 1. Thermal power plant; 2. Heat storage mechanism; 3. Hot water pump; 4. Heat exchange mechanism; 5. Heat user; 6. Primary heating network; 7. Heat storage channel; 71. First heat storage channel valve; 72. Second heat storage channel valve; 8. Heat extraction channel; 81. First heat extraction channel valve; 82. Second heat extraction channel valve; 9. Bypass channel; 91. First bypass channel valve; 92. Second bypass channel valve; 10. Input channel; 11. Output channel. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with specific embodiments and drawings. In the following description, many details are explained to facilitate a comprehensive understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from those described here. Those skilled in the art can make similar generalizations and interpretations based on actual application scenarios without violating the essential connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of the specific embodiment.

[0026] Unless otherwise defined, all technical and scientific terms used in this document are consistent with the meanings commonly understood by technicians in the technical field of this application; the terms used in this document are only for describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification, claims and the above-mentioned figure descriptions of this application and any of their modified forms are intended to cover non-exclusive inclusions.

[0027] Please refer to Figure 1 The utility model proposes a cross-seasonal distributed heat storage heating system for a thermal power plant, including a thermal power plant 1, a heat storage mechanism 2, a hot water pump 3, a heat exchange mechanism 4, and a heat user 5. The thermal power plant 1 is connected to the heat storage mechanism 2 through a primary heating pipe network 6 and a heat storage channel 7 to store waste heat from the thermal power plant in summer; the heat storage mechanism 2 is connected to the heat exchange mechanism 4 through a heat extraction channel 8, and the heat is transported to the heat exchange mechanism 4 through the hot water pump 3. The heat exchange mechanism 4 is connected to the heat user 5 to transfer the heat to the heat user 5.

[0028] Thermal power plant 1: provides high-temperature hot water and receives low-temperature return water.

[0029] The primary heating network 6 (the definition of the primary heating network comes from the Technical Specification for Energy-Saving Reconstruction of Heating Systems GB / T50893-2013) is connected to the thermal power plant 1, and the thermal power plant 1 sends out and recovers the high-temperature heat storage medium through the primary heating network 6.

[0030] Heat storage mechanism 2: connected to the primary heating network 6, high-temperature heat storage medium flows into the heat storage mechanism 2, and low-temperature heat storage medium flows out of the heat storage mechanism 2. The heat storage mechanism 2 is used to store the heat in the high-temperature hot water.

[0031] Heat exchanging mechanism 4 : connected to the heat storage mechanism 2 , the heat storage medium of the heat storage mechanism 2 is transported to the heat exchanging mechanism 4 , and the heat is extracted by the heat exchanging mechanism 4 and then returned to the heat storage mechanism 2 .

[0032] Heat user 5 : connected to the heat exchange mechanism 4 , the heat exchange mechanism 4 is used to convert the heat in the heat storage mechanism 2 into heating hot water, and transport the heating hot water to the heat user 5 .

[0033] According to an embodiment of the present utility model, a heat storage channel 7 is provided between the heat storage mechanism 2 and the primary heating network 6 , and a first heat storage channel valve 71 and a second heat storage channel valve 72 are provided on the heat storage channel 7 .

[0034] According to an embodiment of the present utility model, a heat extraction channel 8 is provided between the heat storage mechanism 2 and the heat exchange mechanism 4 , and a first heat storage channel valve 71 and a second heat storage channel valve 72 are provided on the heat extraction channel 8 .

[0035] According to an embodiment of the utility model, a bypass channel 9 is provided between the heat storage channel 7 and the heat extraction channel 8 , and a first bypass channel valve 91 and a second bypass channel valve 92 are provided on the bypass channel 9 .

[0036] According to an embodiment of the utility model, the heat storage mechanism 2 is an underground water pool or an underground water tank, and the location of the heat storage mechanism 2 can be determined according to the actual local conditions.

[0037] According to an embodiment of the utility model, a heating method using a cross-season distributed heat storage heating system of a thermal power plant specifically includes:

[0038] Thermal power plant 1 provides high-temperature hot water and receives low-temperature return water;

[0039] The thermal power plant 1 sends and recovers the high-temperature heat storage medium through the primary heat supply network 6;

[0040] The high-temperature heat storage medium flows into the heat storage mechanism 2 through the primary heat supply pipe network 6 and the heat storage channel 7, and the low-temperature heat storage medium flows out of the heat storage mechanism 2 through the heat storage channel 7 and the primary heat supply pipe network 6 and is recovered by the thermal power plant 1. The heat storage mechanism 2 is used to store the heat in the high-temperature hot water;

[0041] The high-temperature heat storage medium of the heat storage mechanism 2 is transported to the heat exchange mechanism 4, and the heat exchange mechanism 4 extracts the heat and then returns it to the heat storage mechanism 2;

[0042] The heat user 1 is connected to a heat exchange mechanism 4 , and the heat exchange mechanism 4 is used to convert the heat in the heat storage mechanism 2 into heating hot water, and transport the heating hot water to the heat user 5 .

[0043] That is, in the heat storage condition, the heat demand of the heat user 5 disappears in summer. In order to allow the thermal power plant 1 to continue to operate in a cogeneration mode, the heat storage mechanism 2 is introduced as a virtual heat user in summer. When the high-temperature water discharged from the thermal power plant 1 flows through the heat storage mechanism 2, the heat of the high-temperature water is stored in the heat storage mechanism 2, the first heat extraction channel valve 81 and the second heat extraction channel valve 82 are closed, the first bypass channel valve 91 and the second bypass channel valve 92 are closed, and the first heat storage channel valve 71 and the second heat storage channel valve 72 are opened.

[0044] That is, in the heat release condition, the first heat storage channel valve 71 and the second heat storage channel valve 72 are closed, the first bypass channel valve 91 and the second bypass channel valve 92 are opened, and the first heat extraction channel valve 81 and the second heat extraction channel valve 82 are opened. In winter, the heat demand of heat user 5 increases and then decreases over time. The heat storage mechanism 2 can replace the peak-shaving boiler room and jointly supply heat to heat user 5 with the thermal power plant 1; the thermal power plant 1 performs flexible peak-shaving of thermal power units according to the dispatching demand of new energy power, and the heat supply is not affected during the peak-shaving period of thermal power plant 1. Or the heat storage mechanism 2 can bear the basic heat load and expand the heating area. The original peak-shaving boiler room continues to maintain the status quo.

[0045] That is, in the storage and discharge operation state, the first heat storage channel valve 71 and the second heat storage channel valve 72 are opened, the first bypass channel valve 91 and the second bypass channel valve 92 are opened, the first heat extraction channel valve 81 and the second heat extraction channel valve 82 are opened, and the heat storage mechanism 2 and the thermal power plant 1 supply heat to the heat user 5 at the same time.

[0046] The heat storage medium of the heat storage mechanism 2 can be water or a composite heat storage medium formed by water and surrounding soil. Since the heat abandonment power of the thermal power plant 1 is very large, the conditions for building a super-large heat storage pool around the thermal power plant alone are limited. Therefore, the number of heat storage mechanisms 2 can be dispersed according to the geographical conditions of the end users.

[0047] For example, in summer, the waste heat of high-temperature water in the thermal power plant 1 is stored in the heat storage mechanism 2. When heat is needed in winter, the heat stored in the heat storage mechanism 2 is extracted by the heat exchange mechanism 4, and the extracted heat is used to meet the needs of the heat user 5.

[0048] In this way, the heat wasted in the thermal power plant 1 in summer is stored by the heat storage mechanism 2 and released in winter, which realizes the cogeneration of heat and power in summer and satisfies the flexibility demand of the thermal power plant 1 to participate in power peak regulation in winter. It can also replace coal-fired, gas-fired and oil-fired boiler rooms as needed.

[0049] There are several distributed heating units consisting of the above-mentioned heat storage mechanism 2, hot water pump 3, heat exchange mechanism 4, valves and pipelines, and the number depends on the number of heat users 5. The entire distributed heating unit distributes heat to the heat users 5 through the primary heating pipeline network 6.

[0050] In summary, the utility model provides a cross-seasonal distributed heat storage heating system for a thermal power plant. The heat storage mechanism 2 can collect and store the abandoned heat of the thermal power plant 1 in summer, so as to achieve summer heat and winter use, expand the heating area, generate economic benefits, and promote the low-carbonization of coal-fired power. This method also provides thermal power decoupling space for thermal power units to participate in the peak load bidding to the grid to the maximum extent, and provides a feasibility for the state to use the grid-connected electricity price to guide enterprises to produce in an orderly manner.

[0051] In the description of the embodiments of the present application, unless there are clear and explicit provisions and limitations, technical terms such as "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or forming a whole; it can also be a mechanical connection. For ordinary technicians in this field, they can understand the specific meanings of these terms in the embodiments of the present application based on the specific circumstances.

[0052] This application uses specific words to describe the embodiments of this application. For example, "one embodiment", "an embodiment" and "some embodiments" mean a certain feature, structure or characteristic associated with at least one embodiment of this application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different places in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of this application can be appropriately combined.

[0053] Although the utility model is publicly presented in the form of preferred embodiments, it is not intended to limit the utility model. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the utility model. Therefore, as long as it does not deviate from the technical solution of the utility model, any modification, equivalent change and modification made to the above embodiments in accordance with the technical essence of the utility model are within the scope of protection defined by the claims of the utility model.

Claims

1. A distributed heat storage heating system for thermal power plants across seasons, characterized in that: It includes a thermal power plant, a primary heating network, a plurality of distributed heating units and heat users, wherein the plurality of distributed heating units are arranged between the primary heating network and the heat user side; The distributed heating unit includes a heat storage mechanism and a heat exchange mechanism. The thermal power plant is connected to each distributed heating unit through a two-way primary heating pipeline network for transporting heat back and forth. The primary heating pipeline network is connected to the two heat storage channels of each distributed heating unit. The heat storage channel connects one side of the heat storage mechanism. Each heat storage channel is respectively provided with a first heat storage channel valve and a second heat storage channel valve. The other side of the heat storage mechanism is connected to the two input channels of the heat exchange mechanism through two heat extraction channels for transporting heat back and forth. Each heat extraction channel is respectively provided with a first heat extraction channel valve and a second heat extraction channel valve. A hot water pump is provided between the second heat extraction channel valve and the heat storage mechanism. The two output channels of the heat exchange mechanism for transporting heat back and forth are connected to heat users. The thermal power plant is also connected to one end of the two bypass channels through two-way primary heating pipeline network for transporting heat back and forth. The other end of the bypass channel is connected to the two input channels of the heat exchange mechanism. The two bypass channels are respectively provided with a first bypass channel valve and a second bypass channel valve.

2. The distributed heat storage heating system for thermal power plants across seasons according to claim 1 is characterized in that: The heat storage mechanism is an underground water pool or an underground water tank.

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