Steam extraction indirect heat storage and supply device for thermal power plant

Abstract

The utility model relates to the technical field of heat storage and heat supply devices, and discloses a thermal power plant steam extraction indirect heat storage and heat supply device which comprises a movable heat storage system and a movable heat supply system, the movable heat storage system comprises a steam conduction oil heat exchanger and movable heat storage and heat exchange equipment, the steam conduction oil heat exchanger is communicated with a steam turbine high-pressure cylinder, and the movable heat storage and heat exchange equipment is communicated with a steam turbine high-pressure cylinder. The steam heat-conducting oil heat exchanger is communicated with the movable heat storage and exchange equipment, the movable heat storage and exchange equipment is communicated with the first heat-conducting oil tank, and the first heat-conducting oil tank is communicated with the steam heat-conducting oil heat exchanger; the movable heat supply system comprises movable heat storage and exchange equipment, a medium-temperature heat user and a second heat conduction oil tank, the movable heat storage and exchange equipment is communicated with the second heat conduction oil tank, the movable heat storage and exchange equipment is communicated with the medium-temperature heat user, and the medium-temperature heat user is communicated with the second heat conduction oil tank. The device has the advantages that the flexibility of heat energy use of a power plant is improved, and the manufacturing cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of heat storage heating devices, in particular to an indirect heat storage heating device for steam extraction in a thermal power plant. Background Art

[0002] With the development of large-scale and energy-saving industrial equipment, some high-energy-consuming and high-pollution equipment such as small coal-fired boilers are gradually being eliminated. This is undoubtedly a huge challenge for some companies that use medium and low temperature media as heat sources. Such companies need to seek other heating methods to meet the needs of industrial heat sources. For thermal power plants, the temperature and pressure of each steam extraction interface are different, which can meet the needs of a variety of industrial heat. If this part of the heat is provided to industrial users, it will greatly improve the thermal economy of the thermal power plant. In addition, improving transportation flexibility will also greatly improve energy utilization efficiency. How to provide the steam extraction heat at all levels of thermal power plants to industrial users with flexible heating and flexible transportation is a problem that this patent urgently needs to solve. Utility Model Content

[0003] 1. Technical Problems Solved

[0004] The technical problem to be solved by the utility model is that the thermal efficiency utilization rate of the existing thermal power plants is low and cannot meet the needs of other heat-using enterprises.

[0005] 2. Technical Solution

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a thermal power plant extraction steam indirect heat storage heating device, including a mobile heat storage system and a mobile heating system,

[0007] The mobile heat storage system comprises a steam thermal oil heat exchanger and a mobile heat storage heat exchange device, the steam thermal oil heat exchanger is connected to the high-pressure cylinder of the steam turbine, the steam thermal oil heat exchanger is connected to the mobile heat storage heat exchange device, the mobile heat storage heat exchange device is connected to the first thermal oil tank, and the first thermal oil tank is connected to the steam thermal oil heat exchanger;

[0008] The mobile heating system includes a mobile heat storage and heat exchange device, a medium-temperature heat user and a second thermal oil tank. The mobile heat storage and heat exchange device is connected to the second thermal oil tank, the mobile heat storage and heat exchange device is connected to the medium-temperature heat user, and the medium-temperature heat user is connected to the second thermal oil tank.

[0009] Further, a first stop valve, a regulating valve, a first flow sensor, a first pressure sensor and a first temperature sensor are provided on the pipeline between the steam thermal oil heat exchanger and the high-pressure cylinder of the steam turbine; a second temperature sensor, a second stop valve, a first connecting flange, a third stop valve and a first header are provided on the pipeline between the steam thermal oil heat exchanger and the mobile heat storage and heat exchange equipment; a second header, a seventh stop valve, a fourth connecting flange, an eighth stop valve and a fifth temperature sensor are provided on the pipeline between the mobile heat storage and heat exchange equipment and the first thermal oil tank; a first thermal oil tank, a first thermal oil pump, a third flow sensor and a ninth stop valve are provided on the pipeline between the first thermal oil tank and the steam thermal oil heat exchanger;

[0010] A second flow sensor, a fifth stop valve, a third connecting flange and a sixth stop valve are provided on the pipeline between the mobile heat storage and heat exchange equipment and the second thermal oil tank, and a fourth stop valve, a second connecting flange and a fourth temperature sensor are provided on the pipeline between the mobile heat storage and heat exchange equipment and the medium-temperature heat user.

[0011] Further, the pipeline connection end of the first header is connected to the third stop valve and the fourth stop valve through a tee, and the pipeline connection end of the second header is connected to the sixth stop valve and the seventh stop valve through a tee.

[0012] Furthermore, the steam extraction port of the high-pressure cylinder of the steam turbine is connected to a first stop valve, and the steam side inlet of the steam thermal oil heat exchanger is connected to a first temperature sensor.

[0013] Furthermore, a non-pressure water discharge end is connected to the steam side outlet of the steam thermal oil heat exchanger.

[0014] Furthermore, a tenth stop valve is provided on the pipeline between the steam side outlet and the pressure-free water discharge end of the steam thermal oil heat exchanger.

[0015] Furthermore, the mobile heat storage and heat exchange equipment is provided with a third temperature sensor.

[0016] Furthermore, the mobile heat storage and heat exchange equipment includes a first header 30, a second header 31, a heat exchange tube, a heat storage material, and a heat exchanger shell. The first header and the second header are connected at both ends of the heat exchange tube to play a flow equalization and buffering role. The heat storage material is evenly filled between the heat exchange tube and the heat exchanger shell, and the phase change temperature of the heat storage material is 190°C to 200°C.

[0017] 3. Beneficial Effects

[0018] The advantages of the utility model compared with the prior art are:

[0019] 1. Using power plant steam extraction for mobile heating improves the flexibility of thermal energy use in power plants, reduces the use of old, small, and highly polluting boilers, and reduces environmental pollution;

[0020] 2. An indirect heat exchanger is set up to use steam to heat the heat transfer oil, reducing the heat exchange area of ​​steam in the phase change mobile heat storage and heat exchange equipment, which reduces the manufacturing cost and avoids the decomposition of the phase change heat storage material caused by excessively high steam temperature;

[0021] 3. At the same time, self-driving cars are used to achieve flexible transportation from a fixed starting point to the end point, which improves the flexibility of energy and manpower use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a flow chart of a thermal power plant extraction steam indirect heat storage heating device with an automatic driving function provided by the utility model;

[0023] Figure 2 A schematic diagram of a heat storage process of a thermal power plant extraction steam indirect heat storage heating device with an automatic driving function provided by the utility model;

[0024] Figure 3 A schematic diagram of a heat storage process of a thermal power plant extraction steam indirect heat storage heating device with an automatic driving function provided by the utility model;

[0025] Figure 4 This is a schematic structural diagram of a mobile heat storage and heat exchange device of a thermal power plant extraction steam indirect heat storage heating device with an automatic driving function provided by the utility model.

[0026] Figure numerals: 1. high-pressure cylinder of steam turbine, 2. first stop valve, 3. regulating valve, 4. first flow sensor, 5. first pressure sensor, 6. first temperature sensor, 7. steam thermal oil heat exchanger, 8. second temperature sensor, 9. second stop valve, 10. first connecting flange, 11. third stop valve, 12. fourth stop valve, 13. second connecting flange, 14. mobile heat storage and heat exchange equipment, 15. third temperature sensor, 16. fourth temperature sensor, 17. second thermal oil tank, 18. second thermal oil pump, 19. The second flow sensor, 20, the fifth stop valve, 21, the third connecting flange, 22, the sixth stop valve, 23, the seventh stop valve, 24, the fourth connecting flange, 25, the eighth stop valve, 26, the first thermal oil tank, 27, the first thermal oil pump, 28, the third flow sensor, 29, the ninth stop valve, 30, the first collecting box, 31, the second collecting box, 32, the fifth temperature sensor, 33, the tenth stop valve, 34, the non-pressure water discharge end, 35, the medium-temperature heat user, 36, the heat exchange tube, 37, the heat storage material, 38, the heat exchanger shell. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0028] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the utility model are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0031] The utility model will now be further described in conjunction with the accompanying drawings.

[0032] See also Figure 1 Figure, 2 Figure, 3 and Figure 4 , the utility model is a preferred embodiment of a thermal power plant steam extraction indirect heat storage heating device with automatic driving function, the specific component connections, see Figure 1 , the heat storage process working diagram is shown in Figure 2 , mobile heating schematic diagram see Figure 3 , the structural diagram of mobile heat storage and heat exchange equipment is shown in Figure 4 .

[0033] For example, in the above-mentioned thermal power plant extraction steam indirect heat storage heating device with automatic driving function, in a preferred embodiment, the heat storage process is:

[0034] like Figure 2As shown, the steam from the steam extraction port of the high-pressure cylinder 1 of the steam turbine sequentially passes through the first stop valve 2, the regulating valve 3, the first flow sensor 4, the first pressure sensor 5, the first temperature sensor 6 and the steam side of the steam-heat-conducting oil heat exchanger 7, the tenth stop valve 33 and the non-pressure water discharge end 34;

[0035] The heat transfer oil in the first heat transfer oil tank 26 passes through the first heat transfer oil pump 27, the third flow sensor 28, the ninth stop valve 29, the steam heat transfer oil heat exchanger 7 oil tester, the second temperature sensor 8, the second stop valve 9, the first connecting flange 10, the third stop valve 11, the first header 30, the mobile heat storage and heat exchange device 14, the second header 31, the seventh stop valve 23, the fourth connecting flange 24, the eighth stop valve 25, the fifth temperature sensor 32 and the first heat transfer oil tank 26 in sequence;

[0036] The heat transfer oil in the first heat transfer oil tank 26 is heated to 220° C. in the steam heat transfer oil heat exchanger 7, and then enters the mobile heat storage and heat exchange equipment 14 to heat the heat storage material 37. The heat storage material 37 is heated to 200° C., and the heat transfer oil flows back to the first heat transfer oil tank 26; the cooled steam is decompressed and discharged to the non-pressure drain end 34 of the steam turbine to be recycled.

[0037] For example, in the above-mentioned thermal power plant extraction steam indirect heat storage heating device with automatic driving function, in a preferred embodiment, the mobile heating process is:

[0038] like Figure 3 As shown, the heat transfer oil in the second heat transfer oil tank 17 passes through the second heat transfer oil pump 18, the second flow sensor 19, the fifth stop valve 20, the third connection flange 21, the sixth stop valve 22, the second header 31, the mobile heat storage and heat exchange equipment 14, the first header 30, the fourth stop valve 12, the second connection flange 13, the fourth temperature sensor 16, the medium temperature heat user 35 and the second heat transfer oil tank 17 in sequence;

[0039] The heat transfer oil in the second heat transfer oil tank 17 is heated to 175° C. in the mobile heat storage and heat exchange device 14 , and then enters the medium-temperature heat user 35 to provide a medium-temperature heat source for the user, and the cooled heat transfer oil flows back to the second heat transfer oil tank 17 .

[0040] The utility model and its implementation are described, and such description is not restrictive. The drawings are only one of the implementations of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention of the utility model, they can design a structure and implementation example similar to the technical solution without creativity, which should belong to the protection scope of the utility model.

Claims

1. A thermal power plant extraction steam indirect heat storage heating device, comprising a mobile heat storage system and a mobile heating system, characterized in that: The mobile heat storage system comprises a steam thermal oil heat exchanger and a mobile heat storage heat exchange device, the steam thermal oil heat exchanger is connected to the high-pressure cylinder of the steam turbine, the steam thermal oil heat exchanger is connected to the mobile heat storage heat exchange device, the mobile heat storage heat exchange device is connected to the first thermal oil tank, and the first thermal oil tank is connected to the steam thermal oil heat exchanger; The mobile heating system includes a mobile heat storage and heat exchange device, a medium-temperature heat user and a second thermal oil tank. The mobile heat storage and heat exchange device is connected to the second thermal oil tank, the mobile heat storage and heat exchange device is connected to the medium-temperature heat user, and the medium-temperature heat user is connected to the second thermal oil tank.

2. The indirect heat storage heating device for extracting steam from a thermal power plant according to claim 1, characterized in that: A first stop valve, a regulating valve, a first flow sensor, a first pressure sensor and a first temperature sensor are provided on the pipeline between the steam thermal oil heat exchanger and the high-pressure cylinder of the steam turbine; a second temperature sensor, a second stop valve, a first connecting flange, a third stop valve and a first header are provided on the pipeline between the steam thermal oil heat exchanger and the mobile heat storage and heat exchange equipment; a second header, a seventh stop valve, a fourth connecting flange, an eighth stop valve and a fifth temperature sensor are provided on the pipeline between the mobile heat storage and heat exchange equipment and the first thermal oil tank; a first thermal oil tank, a first thermal oil pump, a third flow sensor and a ninth stop valve are provided on the pipeline between the first thermal oil tank and the steam thermal oil heat exchanger; A second flow sensor, a fifth stop valve, a third connecting flange and a sixth stop valve are provided on the pipeline between the mobile heat storage and heat exchange equipment and the second thermal oil tank, and a fourth stop valve, a second connecting flange and a fourth temperature sensor are provided on the pipeline between the mobile heat storage and heat exchange equipment and the medium-temperature heat user.

3. The indirect heat storage heating device for extracting steam from a thermal power plant according to claim 2, characterized in that: The pipeline connection end of the first header is connected to the third stop valve and the fourth stop valve through a tee, and the pipeline connection end of the second header is connected to the sixth stop valve and the seventh stop valve through a tee.

4. The indirect heat storage heating device for extracting steam from a thermal power plant according to claim 1, characterized in that: The steam extraction port of the high-pressure cylinder of the steam turbine is connected to the first stop valve, and the steam side inlet of the steam thermal oil heat exchanger is connected to the first temperature sensor.

5. The indirect heat storage heating device for extracting steam from a thermal power plant according to claim 1, characterized in that: The steam side outlet of the steam thermal oil heat exchanger is connected with a non-pressure water discharge end.

6. The indirect heat storage heating device for extracting steam from a thermal power plant according to claim 5, characterized in that: A tenth stop valve is arranged on the pipeline between the steam side outlet and the pressure-free water discharge end of the steam thermal oil heat exchanger.

7. The indirect heat storage heating device for extracting steam from a thermal power plant according to claim 1, characterized in that: The mobile heat storage and heat exchange device is provided with a third temperature sensor.

8. The indirect heat storage heating device for extracting steam from a thermal power plant according to any one of claims 1, 2 or 7, characterized in that: The mobile heat storage and heat exchange equipment comprises a first header (30), a second header (31), a heat exchange tube, a heat storage material, and a heat exchanger shell. The first header and the second header are connected at both ends of the heat exchange tube to play a flow balancing and buffering role. The heat storage material is evenly filled between the heat exchange tube and the heat exchanger shell. The phase change temperature of the heat storage material is 190°C to 200°C.

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