Multi-stage steam heat supply connecting system of thermal power plant

Abstract

The utility model discloses a multi-stage steam heat supply connecting system of a thermal power plant. The multi-stage steam heat supply connecting system comprises a second-stage ultrahigh-pressure heat supply unit, a first-stage heat supply unit, a second-stage high-pressure heat supply unit and a second-stage low-pressure heat supply unit, the first-stage heat supply unit comprises a first-stage high-pressure heat supply unit, a first first-stage medium-pressure heat supply unit, a second first-stage medium-pressure heat supply unit and a first-stage low-pressure heat supply unit; a heat supply steam header of the first-stage high-pressure heat supply unit is in heat supply connection with a heat supply steam header of the first first-stage medium-pressure heat supply unit, and the heat supply steam header of the first first-stage medium-pressure heat supply unit is connected with a heat supply steam header of the second first-stage medium-pressure heat supply unit and a heat supply steam header of the first-stage low-pressure heat supply unit. A heat supply steam header of the first-stage low-pressure heat supply unit is connected with a heat supply steam header of the second-stage low-pressure heat supply unit; the step-by-step heat supply based on the first heat supply station is realized, and the heat supply efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-stage steam heating, in particular to a multi-stage steam heating connection system for a thermal power plant. Background Art

[0002] The coal-fired machine adopts the coal gasification combustion mechanism, and optimizes and improves the grate, furnace and air inlet structure of the traditional chain furnace. The raw coal is slowly and orderly fed into the burner through the chain grate. Most of the coal is converted into coal gas, which is mixed with the excess high-temperature air of the burned coal and burned and ejected out of the burner outlet; the coal-fired machine is equipped with an automatic combustion control system, so that the combustion temperature is high, the flame length can be selected according to the degree of mixing, and the flame is relatively clean, and the emission indicators fully meet the environmental protection standards. Finally, the remaining coal is burned, and the burnt coal slag is directly discharged by the automatic slag remover. Coal-fired heating units usually produce heating steam of different pressure levels. At present, there is a lack of reliable distribution and standby heating steam of different pressure levels to meet the heating reliability needs of heat users. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a multi-stage steam heating connection system for a thermal power plant, and the specific technical scheme is as follows:

[0004] The system includes a second-phase ultra-high pressure heating unit, a first-phase heating unit, a second-phase high-pressure heating unit, and a second-phase low-pressure heating unit;

[0005] The first-phase heating unit includes a first-phase high-pressure heating unit, a first-phase medium-pressure heating unit, a second-phase medium-pressure heating unit and a first-phase low-pressure heating unit;

[0006] The second-phase ultra-high pressure heating unit supplies heat to the first-phase high pressure heating unit and the second-phase high pressure heating unit;

[0007] The heating steam manifold of the first-stage high-pressure heating unit is connected to the heating steam manifold of the first-stage medium-pressure heating unit for heating supply, the heating steam manifold of the first-stage medium-pressure heating unit is connected to the heating steam manifold of the second-stage medium-pressure heating unit and the heating steam manifold of the first-stage low-pressure heating unit respectively, and the heating steam manifold of the first-stage medium-pressure heating unit is bidirectionally connected to the heating steam manifold of the second-stage medium-pressure heating unit;

[0008] The heating steam header of the first-phase low-pressure heating unit is connected to the heating steam header of the second-phase low-pressure heating unit;

[0009] The first-stage high-pressure heating unit supplies heat to the first first-stage medium-pressure heating unit, and the first first-stage medium-pressure heating unit supplies heat to the first-stage low-pressure heating unit; the second-stage high-pressure heating unit supplies heat to the second first-stage medium-pressure heating unit, and the second first-stage medium-pressure heating unit supplies heat to the second-stage low-pressure heating unit.

[0010] Furthermore, the second-stage ultra-high-pressure heating unit includes at least one main steam desuperheating and pressure-reducing steam input for the first-stage project, at least one set of high-pressure units, at least one heating output end, and a heating steam header;

[0011] The main steam desuperheating and pressure-reducing steam input for the first-stage project is connected to the corresponding heating steam header through a desuperheating section and a mixing section;

[0012] The heating steam header of the second-stage ultra-high-pressure heating unit is connected to the high-pressure unit through a first pipeline and a second pipeline connected in two sections.

[0013] Furthermore, the pipeline of the desuperheating section is made of A335P91 material, and the pipeline of the mixing section is made of 12Cr1MoVG material;

[0014] A pneumatic check valve and an electric gate valve are provided on the desuperheating section;

[0015] The first pipeline is made of 12Cr1MoVG material, and the second pipeline is made of A335P91 material;

[0016] A check valve and an electric gate valve are provided on the first pipeline, and two regulating valves and a check valve are provided on the second pipeline.

[0017] Furthermore, the heating steam header of the second-stage ultra-high-pressure heating unit is connected to the high-pressure cylinder of the high-pressure unit through the first pipeline and the second pipeline, and steam supply valves are provided on both the left and right sides of the high-pressure cylinder, and the two steam supply valves are connected through a steam guide pipe.

[0018] The steam guide pipe is made of A335P92 material.

[0019] Furthermore, the second-stage low-pressure heating unit includes at least one set of medium-pressure units, at least one heating output end, and a heating steam header;

[0020] The heating steam header of the second-stage low-pressure heating unit is connected to the medium-pressure unit through a third pipeline and a fourth pipeline connected in two sections.

[0021] Furthermore, the third pipeline is made of 20 steel material, and the fourth pipeline is made of 12Cr1MoVG material;

[0022] A check valve and a butterfly valve are provided on the third pipeline, and a stop valve, a pneumatic regulating valve, and an electric gate valve are provided on the fourth pipeline.

[0023] Further, the heating steam header of the second-stage low-pressure heating unit is connected to the intermediate-pressure cylinder of the intermediate-pressure unit through the third pipeline and the fourth pipeline. There are two intermediate-pressure cylinders, and the two intermediate-pressure cylinders are connected through a pipeline made of 12Cr1MoVG material.

[0024] Further, the heating steam header of the first-stage high-pressure heating unit is bidirectionally connected to the heating steam header of the second-stage high-pressure heating unit.

[0025] Further, the heating steam header of the first-stage low-pressure heating unit is bidirectionally connected to the heating steam header of the second-stage low-pressure heating unit.

[0026] Further, the system also includes a desuperheating water input, and the desuperheating water is input into the corresponding pipeline through an electric valve.

[0027] The beneficial effects of the present utility model are as follows:

[0028] The present utility model discloses a system for multi-stage steam heating. Based on this system architecture, step-by-step heating is realized, that is, the second-stage ultra-high pressure heats the first-stage high pressure, the first-stage high pressure heats the hot reheat, the first-stage hot reheat heats the intermediate-pressure exhaust, the second-stage high pressure heats the first-stage cold reheat, and the first-stage cold reheat heats the second-stage low pressure, maximizing the utilization of the heating capacity and improving the heating efficiency. Description of the Drawings

[0029] Figure 1 It is a schematic diagram of the overall structure of the heating system.

[0030] Figure 2 It is a schematic diagram of the structure of the steam input part of the first-stage project of the second-stage ultra-high pressure heating unit.

[0031] Figure 3 It is a schematic diagram of the structure of the high-pressure cylinder part of the unit of the second-stage ultra-high pressure heating unit.

[0032] Figure 4 It is a schematic diagram of the structure of the heating header part of the second-stage ultra-high pressure heating unit.

[0033] Figure 5 It is a schematic diagram of the structure of the first-stage high-pressure heating unit.

[0034] Figure 6 It is a schematic diagram of the structure of the first-stage intermediate-pressure heating unit.

[0035] Figure 7 It is a schematic diagram of the structure of the first-stage low-pressure heating unit.

[0036] Figure 8 It is a schematic diagram of the structure of the steam input part of the boiler reheater of the second-stage high-pressure heating unit.

[0037] Figure 9 It is a schematic structural diagram of the heating header part of the second-phase high-pressure heating unit.

[0038] Figure 10 It is a schematic structural diagram of the heating header part of the second-phase low-pressure heating unit.

[0039] Figure 11 It is a schematic structural diagram of the pipeline part of the second-phase low-pressure heating unit.

[0040] Figure 12 It is a schematic structural diagram of the intermediate pressure cylinder part of the unit of the second-phase low-pressure heating unit.

[0041] Explanation of reference numerals: 1 - Second-phase ultra-high-pressure heating unit; 101 - Steam input part of the first-phase project of the second-phase ultra-high-pressure heating unit; 102 - High-pressure cylinder part of the unit of the second-phase ultra-high-pressure heating unit; 103 - Heating header part of the second-phase ultra-high-pressure heating unit; 2 - First-phase heating unit; 201 - First-phase high-pressure heating unit; 202 - First-phase intermediate-pressure heating unit; 203 - First-phase low-pressure heating unit; 3 - Second-phase high-pressure heating unit; 301 - Reheater steam input part of the boiler of the second-phase high-pressure heating unit; 302 - Heating header part of the second-phase high-pressure heating unit; 4 - Second-phase low-pressure heating unit; 401 - Heating header part of the second-phase low-pressure heating unit; 402 - Pipeline part of the second-phase low-pressure heating unit; 403 - Intermediate pressure cylinder part of the unit of the second-phase low-pressure heating unit. Specific implementation manners

[0042] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present utility model.

[0043] In the description of the embodiments of the present utility model, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the utility model product is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0044] In the description of the embodiments of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0045] Embodiment 1

[0046] Embodiment 1 of the present utility model discloses a multi-stage steam heating connection system for a thermal power plant, as Figure 1 shown. The system includes a second-phase ultra-high-pressure heating unit 1, a first-phase heating unit 2, a second-phase high-pressure heating unit 3, and a second-phase low-pressure heating unit 4;

[0047] The first-phase heating unit 2 includes a first-phase high-pressure heating unit 201, a first-phase medium-pressure heating unit 202, and a first-phase low-pressure heating unit 203; the first-phase medium-pressure heating unit 202 includes a first first-phase medium-pressure heating unit and a second first-phase medium-pressure heating unit;

[0048] The second-phase ultra-high-pressure heating unit 1 supplies heat to the first-phase high-pressure heating unit 201 and the second-phase high-pressure heating unit 3;

[0049] Combined with Figure 5 , Figure 6 and Figure 7 shown, the heating steam header of the first-phase high-pressure heating unit 201 is connected for heat supply to the heating steam header of the first first-phase medium-pressure heating unit. The heating steam header of the first first-phase medium-pressure heating unit is respectively connected to the heating steam header of the second first-phase medium-pressure heating unit and the heating steam header of the first-phase low-pressure heating unit 203. The heating steam header of the first first-phase medium-pressure heating unit is in two-way communication with the heating steam header of the second first-phase medium-pressure heating unit;

[0050] The steam supply header of the first-stage low-pressure heat supply unit 203 is connected to the steam supply header of the second-stage low-pressure heat supply unit 4;

[0051] The first-stage high-pressure heat supply unit 201 supplies heat to the first first-stage medium-pressure heat supply unit, and the first first-stage medium-pressure heat supply unit supplies heat to the first-stage low-pressure heat supply unit 203; the second-stage high-pressure heat supply unit 3 supplies heat to the second first-stage medium-pressure heat supply unit, and the second first-stage medium-pressure heat supply unit supplies heat to the second-stage low-pressure heat supply unit 4.

[0052] Combined Figure 2 、 Figure 3 and Figure 4 As shown in, the second-stage ultra-high-pressure heat supply unit 1 includes the first-stage project steam input part 101 of the second-stage ultra-high-pressure heat supply unit, the high-pressure cylinder part 102 of the second-stage ultra-high-pressure heat supply unit, and the heat supply header part 103 of the second-stage ultra-high-pressure heat supply unit, specifically as follows:

[0053] In this embodiment, the second-stage ultra-high-pressure heat supply unit 1 includes two-way first-stage project main steam desuperheating and pressure-reducing steam inputs, two groups of high-pressure units, one heat supply output end, and a heat supply steam header;

[0054] Specifically, the first-stage project main steam desuperheating and pressure-reducing steam input is connected to the corresponding heat supply steam header through a desuperheating section and a mixing temperature section; the desuperheating section is connected with desuperheating water input from the feed water system;

[0055] In this embodiment, the pipeline of the desuperheating section is made of A335P91 material, and the pipeline of the mixing temperature section is made of 12Cr1MoVG material;

[0056] A pneumatic check valve and an electric gate valve are provided on the desuperheating section;

[0057] The first pipeline is made of 12Cr1MoVG material, and the second pipeline is made of A335P91 material;

[0058] A check valve and an electric gate valve are provided on the first pipeline, and two regulating valves and a check valve are provided on the second pipeline.

[0059] The heat supply steam header of the second-stage ultra-high-pressure heat supply unit 1 is connected to the high-pressure cylinder of the high-pressure unit through two connected first pipelines and second pipelines;

[0060] The high-pressure unit is connected to the first-stage high-pressure heat supply unit and the second-stage high-pressure heat supply unit;

[0061] In this embodiment, steam supply valves are respectively provided on both sides of the high-pressure cylinder, and the two steam supply valves are connected through a steam guide pipe;

[0062] The steam guide pipe is made of A335P92 material.

[0063] Combined with Figure 8 and Figure 9 as shown, the second-stage high-pressure heat supply unit includes two intermediate-stage heat supply steam inputs, a heat supply output end, and a heat supply steam header; that is, the boiler reheater steam input part 301 of the second-stage high-pressure heat supply unit and the heat supply header part 302 of the second-stage high-pressure heat supply unit;

[0064] The intermediate-stage heat supply steam input is connected to the corresponding heat supply steam header through a pipeline made of 12Cr1MoVG material;

[0065] Combined with Figure 10 、 Figure 11 and Figure 12 as shown, in this embodiment, the second-stage low-pressure heat supply unit includes two medium-pressure units, two heat supply output ends, and a heat supply steam header; that is, the heat supply header part 401 of the second-stage low-pressure heat supply unit, the pipeline part 402 of the second-stage low-pressure heat supply unit, and the medium-pressure cylinder part 403 of the second-stage low-pressure heat supply unit;

[0066] The heat supply steam header of the second-stage low-pressure heat supply unit is connected to the medium-pressure cylinder of the medium-pressure unit through two connected third pipelines and fourth pipelines;

[0067] There are two medium-pressure cylinders, and the two medium-pressure cylinders are connected through a pipeline made of 12Cr1MoVG material.

[0068] Specifically, the third pipeline is made of 20 steel material, and the fourth pipeline is made of 12Cr1MoVG material;

[0069] A check valve and a butterfly valve are provided on the third pipeline, and a stop valve, a pneumatic control valve, and an electric gate valve are provided on the fourth pipeline.

[0070] In this embodiment, the heat supply steam header of the first-stage high-pressure heat supply unit is in two-way communication with the heat supply steam header of the second-stage high-pressure heat supply unit;

[0071] The heat supply steam header of the first-stage low-pressure heat supply unit is in two-way communication with the heat supply steam header of the second-stage low-pressure heat supply unit.

[0072] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A multi-stage steam heating connection system for a thermal power plant, characterized in that: The system includes a second-phase ultra-high pressure heating unit, a first-phase heating unit, a second-phase high-pressure heating unit, and a second-phase low-pressure heating unit; The first-phase heating unit includes a first-phase high-pressure heating unit, a first-phase medium-pressure heating unit, a second-phase medium-pressure heating unit and a first-phase low-pressure heating unit; The second-phase ultra-high pressure heating unit supplies heat to the first-phase high pressure heating unit and the second-phase high pressure heating unit; The heating steam manifold of the first-stage high-pressure heating unit is connected to the heating steam manifold of the first-stage medium-pressure heating unit for heating supply, the heating steam manifold of the first-stage medium-pressure heating unit is connected to the heating steam manifold of the second-stage medium-pressure heating unit and the heating steam manifold of the first-stage low-pressure heating unit respectively, and the heating steam manifold of the first-stage medium-pressure heating unit is bidirectionally connected to the heating steam manifold of the second-stage medium-pressure heating unit; The heating steam header of the first-phase low-pressure heating unit is connected to the heating steam header of the second-phase low-pressure heating unit; The first-phase high-pressure heating unit supplies heat to the first-phase medium-pressure heating unit, and the first-phase medium-pressure heating unit supplies heat to the first-phase low-pressure heating unit; the second-phase high-pressure heating unit supplies heat to the second-phase medium-pressure heating unit, and the second-phase medium-pressure heating unit supplies heat to the second-phase low-pressure heating unit.

2. The multi-stage steam heating connection system for a thermal power plant according to claim 1, characterized in that: The second-phase ultra-high pressure heating unit comprises at least one main steam input for the first-phase project, at least one high-pressure unit, at least one heating output terminal and a heating steam header; The main steam desuperheating and pressure reducing steam input of the first phase project is connected to the corresponding heating steam manifold through the desuperheating section and the temperature mixing section; The heating steam manifold of the second-phase ultra-high pressure heating unit is connected to the high-pressure unit through a first pipeline and a second pipeline connected in two sections.

3. The multi-stage steam heating connection system for a thermal power plant according to claim 2, characterized in that: The pipes in the temperature reduction section are made of A335P91 material, and the pipes in the temperature mixing section are made of 12Cr1MoVG material; The temperature reduction section is provided with a pneumatic check valve and an electric gate valve; The first pipeline is made of 12Cr1MoVG material, and the second pipeline is made of A335P91 material; A check valve and an electric gate valve are arranged on the first pipeline, and two regulating valves and a check valve are arranged on the second pipeline.

4. The multi-stage steam heating connection system for a thermal power plant according to claim 2, characterized in that: The heating steam manifold of the second-phase ultra-high pressure heating unit is connected to the high-pressure cylinder of the high-pressure unit through a first pipeline and a second pipeline. Steam supplement valves are respectively provided on the left and right sides of the high-pressure cylinder, and the two steam supplement valves are connected through a steam guide pipe.

5. The multi-stage steam heating connection system for a thermal power plant according to claim 1, characterized in that: The second-stage low-pressure heating unit includes at least one medium-pressure unit, at least one heating output terminal and a heating steam manifold; The heating steam manifold of the second-stage low-pressure heating unit is connected to the medium-pressure unit through a third pipeline and a fourth pipeline connected in two sections.

6. The multi-stage steam heating connection system for a thermal power plant according to claim 5, characterized in that: The third pipeline is made of steel 20, and the fourth pipeline is made of 12Cr1MoVG; The third pipeline is provided with a check valve and a butterfly valve, and the fourth pipeline is provided with a stop valve, a pneumatic regulating valve and an electric gate valve.

7. The multi-stage steam heating connection system for a thermal power plant according to claim 5, characterized in that: The heating steam manifold of the second-phase low-pressure heating unit is connected to the intermediate-pressure cylinder of the intermediate-pressure unit through the third pipeline and the fourth pipeline. There are two intermediate-pressure cylinders, which are connected through a pipeline made of 12Cr1MoVG material.

8. The multi-stage steam heating connection system for a thermal power plant according to any one of claims 1 to 7, characterized in that: The heating steam manifold of the first-stage high-pressure heating unit is bidirectionally connected with the heating steam manifold of the second-stage high-pressure heating unit.

9. The multi-stage steam heating connection system for a thermal power plant according to any one of claims 1 to 7, characterized in that: The heating steam manifold of the first-phase low-pressure heating unit is bidirectionally connected with the heating steam manifold of the second-phase low-pressure heating unit.

10. The multi-stage steam heating connection system for a thermal power plant according to any one of claims 1 to 7, characterized in that: The system also includes a cooling water input, and the cooling water is input into a corresponding pipeline through an electric valve.

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