Peak shaving system of anthracite generator set

Abstract

The utility model relates to a peak shaving system of an anthracite generator set, which comprises a heat storage tank, a heat exchange tube, a heat exchange tube, a heat exchange tube, a heat exchange tube and a heat exchange tube, and is characterized in that the heat storage tank comprises an upper hot water layer, a middle transition layer and a bottom cold water layer; the first connecting pipe is connected with a hot water inlet and outlet of the hot water layer of the heat storage tank and a hot water supply pipe, the second connecting pipe is connected with a cold water inlet and outlet of the cold water layer of the heat storage tank and a hot water return pipe, and the third connecting pipe is communicated with the first connecting pipe and the hot water return pipe. And an upper water distribution disc and a lower water distribution disc are respectively arranged in the hot water layer and the cold water layer. According to the system, the excessive heat supply amount during high-load operation of the unit can be stored and released when the unit operates in a peak-shaving low-load mode, and therefore the power generation dispatching requirement of a power grid is met under the condition that the heat supply amount is guaranteed.

Description

Technical Field

[0001] The utility model patent belongs to the field of thermal systems of power generation units, and in particular relates to a peak-shaving system for an anthracite power generation unit. Background Art

[0002] Since the volatile matter of anthracite is low and it is difficult to burn, it is difficult for anthracite-fired power generation units to maintain stable combustion under low-load conditions. Even after considering various low-load stable combustion measures, such as adding a startup circulation pump and optimizing the pulverized coal burner, the minimum stable combustion load can still only be 40% BMCR. For the sake of safety, some anthracite-fired power plants that have been in operation avoid low-load fire extinguishing and non-stopping, and the minimum stable combustion load is basically 50% BMR. At present, the peak-shaving capacity of anthracite-fired power plants is weak. When faced with peak-shaving tasks, there are few response measures and poor flexibility. Utility Model Content

[0003] This patent proposes a peak-shaving system for an anthracite-fired power generation unit, which can store the excess heat supply when the unit is running at high load, and release it when the unit is running at low load, thereby ensuring the heat supply and meeting the power generation scheduling needs of the power grid.

[0004] The technical means adopted by the utility model are as follows:

[0005] A peak-shaving system for an anthracite-fired power generation unit, comprising:

[0006] A heat storage tank, the heat storage tank comprising a hot water layer at the top, a transition layer at the middle and a cold water layer at the bottom;

[0007] and a first connecting pipe connecting the hot water inlet and outlet of the hot water layer of the heat storage tank with the hot water supply pipe, a second connecting pipe connecting the cold water inlet and outlet of the cold water layer of the heat storage tank with the hot water return pipe, and a third connecting pipe connecting the first connecting pipe and the hot water return pipe;

[0008] An upper water distribution tray and a lower water distribution tray are respectively arranged in the hot water layer and the cold water layer.

[0009] Preferably, a first valve, a second valve and a third valve are respectively provided on the first connecting pipe, the second connecting pipe and the third connecting pipe, and the first valve is located on the first connecting pipe between the third connecting pipe and the hot water supply pipe; and a fourth valve is also provided on the hot return pipe between the second connecting pipe and the third connecting pipe.

[0010] Preferably, a temperature measuring device is provided on the first connecting pipe between the third connecting pipe and the hot water inlet and outlet of the hot water layer of the heat storage tank.

[0011] Preferably, the height of the transition layer of the heat storage tank is 1-2m.

[0012] Preferably, the top of the heat storage tank is also connected with an overflow pipe and a steam pipe.

[0013] Compared with the existing technology, this peak-shaving system can adopt this peak-shaving method, which can greatly expand the peak-shaving capacity of anthracite from the original 40% BMCR to 100% BMCR to 20% THA to 100% BMCR. It can meet the peak-shaving needs of power plants and provide favorable support for the safe and stable operation of anthracite power generation units. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a schematic diagram of the structure of the anthracite coal-fired power generation set peak regulation system.

[0015] In the figure:

[0016] 1 heat storage tank;

[0017] a hot water layer; a-1 hot water inlet and outlet; a-2 upper water distribution tray;

[0018] b transition layer;

[0019] c cold water layer; c-1 cold water inlet and outlet; c-2 lower water distribution tray;

[0020] 2. Hot water supply pipe;

[0021] 3. Hot water return pipe;

[0022] 4 first connecting pipe;

[0023] 5 second connecting pipe;

[0024] 6 third connecting pipe;

[0025] 7 first valve;

[0026] 8 second valve;

[0027] 9 third valve;

[0028] 10 fourth valve;

[0029] 11. Temperature measuring device;

[0030] 12 overflow pipe;

[0031] 13 Steam pipe. DETAILED DESCRIPTION

[0032] like Figure 1 As shown, a peak load regulation system for anthracite power generation unit is proposed, comprising:

[0033] The heat storage tank 1 includes a hot water layer a at the top, a transition layer b in the middle, and a cold water layer c at the bottom; the top of the heat storage tank 1 is also connected with an overflow pipe 12 and a steam pipe 13. The heat storage tank 1 usually uses a hot water tank, a molten salt tank, solid sand, etc. to store heat as a supplement to the unit's steam extraction heating, indirectly realizing thermal and electrical decoupling. Large heat storage tanks 1 that use short-term heat storage, generally within 1 day, are often used with water as their storage medium.

[0034] It also includes a first connecting pipe 4 connecting the hot water inlet and outlet a-1 of the hot water layer a of the heat storage tank 1 and the external hot water supply pipe 2, a second connecting pipe 5 connecting the cold water inlet and outlet c-1 of the cold water layer c of the heat storage tank 1 and the external hot water return pipe 3, and also has a third connecting pipe 6 connecting the first connecting pipe 4 and the hot water return pipe 3.

[0035] An upper water distribution tray a-2 and a lower water distribution tray c-2 are respectively arranged in the hot water layer a and the cold water layer c, which are used to control the water flow rate flowing in / out to prevent the mixing of the hot and cold water layers c in the heat storage tank 1.

[0036] For the convenience of regulation, a first valve 7, a second valve 8 and a third valve 9 are respectively provided on the first connecting pipe 4, the second connecting pipe 5 and the third connecting pipe 6. The first valve 7 is located on the first connecting pipe 4 between the third connecting pipe 6 and the hot water supply pipe 2; and a fourth valve 10 is also provided on the hot return pipe 3 between the second connecting pipe 5 and the third connecting pipe 6.

[0037] A temperature measuring device 11 is provided on the first connecting pipe 4 between the third connecting pipe 6 and the hot water inlet and outlet a-1 of the hot water layer a of the heat storage tank 1 .

[0038] On this basis, a peak-shaving method for anthracite-fired power generation unit is proposed. The heat storage tank 1 is operated on the principle of forming a layer of cold and hot water by using the density difference caused by the different water temperatures. The upper area of ​​the heat storage tank 1 is the supply water with high temperature, while the lower area of ​​the heat storage tank 1 is the return water with low temperature. There is a transition layer b of 1-2m between the hot and cold water. The water temperature setting in the heat storage tank 1 can refer to Figure 1 Schematic diagram of the height-temperature curve on the left side of the heat storage tank 1. The heat storage tank 1 consists of a tank body (steel tank or reinforced concrete), a water distribution tray, a water level controller, a drainage system, a safety device (safety valve, water seal), temperature and pressure measuring devices, an automatic monitoring and regulating device, a heat storage pump, a heat release pump, a jet pump, a steam generator, and a steam generator water supply pump. Among them, the water distribution tray is the most important part of the heat storage tank.

[0039] Specifically, during heat storage, hot water is stored in the heat storage tank 1 from the upper area, and cold water of the same mass is discharged from the bottom of the heat storage tank 1; during the heat release process, water flows in the opposite direction.

[0040] According to actual needs, this system can increase extraction steam to heat the circulating water of the heating network and store it in the heat storage tank 1 when the heating capacity of the unit is sufficient. When the heating capacity of the unit itself is insufficient, the hot water stored in the heat storage tank 1 can be used for external heating. The system can also increase heating extraction steam to heat the circulating water of the heating network and store it in the heat storage tank 1 when the power grid is in a low period and the unit does not participate in peak regulation. During the peak period of the power grid, the hot water stored in the heat storage tank 1 can be used for external heating to increase the on-grid power load.

Claims

1. A peak load regulation system for anthracite-fired power generation unit, characterized in that: include: A heat storage tank (1), wherein the heat storage tank (1) comprises a hot water layer (a) located at the top, a transition layer (b) located in the middle, and a cold water layer (c) located at the bottom; The heat storage tank (1) comprises a first connecting pipe (4) connecting the hot water inlet and outlet (a-1) of the hot water layer (a) of the heat storage tank (1) and the hot water supply pipe (2), a second connecting pipe (5) connecting the cold water inlet and outlet (c-1) of the cold water layer (c) of the heat storage tank (1) and the hot water return pipe (3), and a third connecting pipe (6) connecting the first connecting pipe (4) and the hot water return pipe (3); An upper water distribution tray (a-2) and a lower water distribution tray (c-2) are respectively arranged in the hot water layer (a) and the cold water layer (c).

2. The anthracite coal-fired power generation unit peak load regulation system according to claim 1, characterized in that: A first valve (7), a second valve (8) and a third valve (9) are respectively arranged on the first connecting pipe (4), the second connecting pipe (5) and the third connecting pipe (6); the first valve (7) is located on the first connecting pipe (4) between the third connecting pipe (6) and the hot water supply pipe (2); and a fourth valve (10) is also arranged on the hot water return pipe (3) between the second connecting pipe (5) and the third connecting pipe (6).

3. The anthracite coal-fired power generation unit peak load regulation system according to claim 2, characterized in that: A temperature measuring device (11) is provided on the first connecting pipe (4) between the third connecting pipe (6) and the hot water inlet and outlet (a-1) of the hot water layer (a) of the heat storage tank (1).

4. The anthracite-fired power generation unit peak load regulation system according to claim 1, characterized in that: The height of the transition layer (b) of the heat storage tank (1) is 1-2 m.

5. The anthracite-fired power generation set peak load regulation system according to claim 1, characterized in that: The top end of the heat storage tank (1) is also connected with an overflow pipe (12) and a steam pipe (13).

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