An operation regulation system for hot water storage tanks used for flexible peak regulation in power plants

Abstract

The present invention discloses an operation regulation system for a hot water storage tank for flexible peak regulation of a power plant, comprising a hot water storage tank, an upper water distributor in the upper part of the hot water storage tank, and a lower water distributor in the lower part of the hot water storage tank; the upper water distributor is connected to the high-temperature outlet pipe on the secondary side of the heat exchanger, and a fourth valve and a tenth valve are provided on the pipeline between the upper water distributor and the high-temperature outlet pipe on the secondary side; the lower water distributor is connected to the low-temperature inlet pipe on the secondary side of the heat exchanger, and a circulating pump is provided on the pipeline between the lower water distributor and the low-temperature inlet pipe on the secondary side of the heat exchanger; a first valve is provided on the pipeline between the lower water distributor and the circulating pump, and a fifth valve and a ninth valve are provided on the pipeline between the circulating pump and the low-temperature inlet pipe on the secondary side of the heat exchanger. The present invention has various regulation types: there are 4 basic regulation working conditions, and the water supply and return water volume of the heat network circulating water and the power of the electrode boiler can be adjusted according to the actual operation requirements to meet various degrees of peak regulation requirements.

Description

Technical Field

[0001] The invention relates to a hot water storage tank, and in particular to an operation regulating system for a hot water storage tank for flexible peak regulation in a power plant. Background Art

[0002] As a storage technology with a simple structure and low investment, hot water storage tanks have been applied in the thermal power decoupling technology of thermal power heating units. The basic principle is: when the heating load is low, the excess steam heat is stored in the hot water storage tank, or the hot water heated by the electrode boiler is stored in the hot water storage tank at low electricity prices; when the heating load is high, the heat in the hot water storage tank is released to bear part of the heating. This can reduce the constraints of the heating load on the power generation output to a certain extent.

[0003] The hot water storage tank uses the principle of different densities of hot and cold water, and installs a water distributor in the hot water storage tank, so that the hot and cold water flow evenly from the top and bottom of the tank, forming a stable inclined temperature layer at the junction of the hot and cold water, so that the hot water is naturally stratified in the hot water storage tank, thereby completing the storage of hot water. However, the current hot water storage pipe function mode is relatively single, and cannot be flexibly adjusted according to working conditions. Summary of the invention

[0004] The purpose of the present invention is to provide an operation regulation system for a hot water storage tank for flexible peak load regulation in a power plant, with various regulation types: there are four basic regulation conditions, which can adjust the heat network circulating water supply, return water volume and electrode boiler power according to actual operation needs to meet various degrees of peak load regulation requirements.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] An operation regulation system for a power plant flexible peak-shaving hot water storage tank comprises a heat storage tank, an upper portion of the heat storage tank is provided with an upper water distributor, and a lower portion of the heat storage tank is provided with a lower water distributor;

[0007] The upper water distributor is connected to the high-temperature water outlet pipe on the secondary side of the heat exchanger, and a fourth valve and a tenth valve are provided on the pipeline between the upper water distributor and the high-temperature water outlet pipe on the secondary side;

[0008] The lower water distributor is connected to the low-temperature water inlet pipe on the secondary side of the heat exchanger, and a circulating pump is provided on the pipeline between the lower water distributor and the low-temperature water inlet pipe on the secondary side of the heat exchanger;

[0009] A first valve is provided on the pipeline between the lower water distributor and the circulation pump, and a fifth valve and a ninth valve are provided on the pipeline between the circulation pump and the low-temperature water inlet pipe on the secondary side of the heat exchanger;

[0010] The primary side water inlet pipe of the heat exchanger is connected to the electrode boiler water, and the primary side water outlet pipe of the heat exchanger is connected to the electrode boiler return water;

[0011] The pipeline between the first valve and the circulation pump is connected to the pipeline between the upper water distributor and the fourth valve through a first branch pipe, and the first branch pipe is provided with a second valve;

[0012] The pipeline between the lower water distributor and the first valve is connected to the circulating water return of the heat network through the second branch pipe, and the second branch pipe is provided with a third valve;

[0013] The pipeline between the fifth valve and the ninth valve is connected to the circulating water supply of the heat network through the third branch pipe, and the sixth valve is arranged on the third branch pipe;

[0014] The pipeline between the fourth valve and the tenth valve is connected to the circulating water supply of the heat network through the fourth branch pipe, and the seventh valve is provided on the fourth branch pipe;

[0015] The pipeline between the fifth valve and the ninth valve is connected with the return water of the heat network circulation water through the fifth branch pipe, and the eighth valve is arranged on the fifth branch pipe.

[0016] In the aforementioned operation and regulation system of a hot water storage tank for flexible peak-shaving of a power plant, the following method is used to store and release heat through the heat network: during heat storage, the second valve, the third valve, and the sixth valve are closed, and the remaining valves are opened; the circulating water supply of the heat network flows into the heat storage tank through the seventh valve and the fourth valve, and the cold water at the bottom of the heat storage tank is discharged from the heat storage tank by the lower water distributor through the first valve, the fifth valve and the circulating pump, and flows into the circulating water return pipe of the heat network through the eighth valve; during heat release, the first valve, the fourth valve, the seventh valve, and the eighth valve are closed, and the remaining valves are opened; the hot water in the heat storage tank flows from the upper water distributor through the second valve, the fifth valve and the circulating pump out of the heat storage tank, flows into the circulating water supply pipe of the heat network through the sixth valve and supplies heat to the outside, and the circulating water return water of the heat network flows into the heat storage tank through the third valve.

[0017] In the aforementioned operation and regulation system of a hot water storage tank for flexible peak-shaving of a power plant, the following method is adopted to store and release heat through a heat exchanger and a heat network: during heat storage, the second valve, the third valve, the sixth valve and the seventh valve are closed, and the remaining valves are opened; the cold water at the bottom of the heat storage tank is discharged from the heat storage tank by the lower water distributor through the first valve, the fifth valve and the circulating pump, and is mixed with the return water of the heat network circulating water from the eighth valve, and then flows into the heat exchanger through the ninth valve for heating, and the heated hot water flows into the tank through the tenth valve and the fourth valve; during heat release, the first valve and the fourth valve are closed, and the remaining valves are opened; the hot water in the heat storage tank flows from the upper water distributor through the second valve, the fifth valve and the circulating pump, and flows into the heat network circulating water supply pipeline through the sixth valve, and is mixed with the hot water from the tenth valve and the seventh valve heater for external heat supply, and part of the return water of the heat network circulating water flows into the tank through the third valve, and part flows into the heater through the eighth valve and the ninth valve for heating.

[0018] Compared with the prior art, the present invention has various adjustment types: there are 4 basic adjustment conditions, and the circulating water supply, return water volume and power of the electrode boiler of the heat network can be adjusted according to the actual operation requirements to meet the peak load requirements of various degrees. And it has the following advantages: 1) High safety: The important equipment of the system, the hot water storage tank, is a normal pressure water tank, and the cold and hot water are stored in one tank at the same time. There is no need to set up a hot water tank and a cold water tank separately, which reduces the investment and operation costs, and has low requirements for operation and maintenance; 2) External heat supply is guaranteed: under extreme conditions, it can be directly supplied through the heat network or directly to the heat network through a heat exchanger for heat supply. 3) The hot water storage tank is directly connected to the heating network, which can maintain the pressure in the network and keep it stable, and play the role of an expansion tank. In particular, if the area where the heat user is located is in a plateau area, the height difference will change greatly, and the heat storage tank can easily determine the pressure stabilization value of the network system; 4) When the heating network fails, it can replenish water to the network immediately to stabilize the network pressure and reduce losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the present invention.

[0020] Figure markings: 1-first valve, 2-second valve, 3-third valve, 4-fourth valve, 5-fifth valve, 6-sixth valve, 7-seventh valve, 8-eighth valve, 9-ninth valve, 10-tenth valve, 11-heat storage tank, 12-upper water distributor, 13-lower water distributor, 14-circulation pump, 15-heat exchanger.

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0022] Embodiments of the present invention: An operation regulation system for a hot water storage tank for flexible peak regulation in a power plant, comprising a hot water storage tank 11, wherein an upper water distributor 12 is provided in the upper part of the hot water storage tank 11, and a lower water distributor 13 is provided in the lower part of the hot water storage tank 11; the upper water distributor 12 is connected to a high-temperature outlet pipe on the secondary side of a heat exchanger 15, and a fourth valve 4 and a tenth valve 10 are provided on the pipeline between the upper water distributor 12 and the high-temperature outlet pipe on the secondary side; the lower water distributor 13 is connected to a low-temperature inlet pipe on the secondary side of the heat exchanger 15, and a circulating pump 14 is provided on the pipeline between the lower water distributor 13 and the low-temperature inlet pipe on the secondary side of the heat exchanger 15; a first valve 1 is provided on the pipeline between the lower water distributor 13 and the circulating pump 14, and a fifth valve 5 and a ninth valve 9 are provided on the pipeline between the circulating pump 14 and the low-temperature inlet pipe on the secondary side of the heat exchanger 15; the primary side water inlet pipe of the heat exchanger 15 The pipe is connected to the electrode boiler water supply, and the primary side outlet pipe of the heat exchanger 15 is connected to the electrode boiler return water; the pipeline between the first valve 1 and the circulating pump 14 is connected to the pipeline between the upper water distributor 12 and the fourth valve 4 through the first branch pipe, and the first branch pipe is provided with a second valve 2; the pipeline between the lower water distributor 13 and the first valve 1 is connected to the heat network circulating water return through the second branch pipe, and the second branch pipe is provided with a third valve 3; the pipeline between the fifth valve 5 and the ninth valve 9 is connected to the heat network circulating water supply through the third branch pipe, and the third branch pipe is provided with a sixth valve 6; the pipeline between the fourth valve 4 and the tenth valve 10 is connected to the heat network circulating water supply through the fourth branch pipe, and the fourth branch pipe is provided with a seventh valve 7; the pipeline between the fifth valve 5 and the ninth valve 9 is connected to the heat network circulating water return through the fifth branch pipe, and the fifth branch pipe is provided with an eighth valve 8.

[0023] In the design of the operation and regulation system of the hot water storage tank, the operation and regulation types of the hot water storage tank are divided into the following forms:

[0024] (1) The hot water storage tank is directly connected to the heating network, the ninth valve 9 and the tenth valve 10 are closed, and the heat exchanger 15 is not in operation.

[0025] 1a. Heat storage process: close the second valve 2, the third valve 3, and the sixth valve 6, and open the other valves. The circulating water supply of the heating network flows into the tank through the seventh valve 7 and the fourth valve 4, and the cold water at the bottom of the tank is discharged from the tank by the lower water distributor 13 through the first valve 1, the fifth valve 5 and the circulating pump 14 of the hot water storage tank, and flows into the circulating water return pipe of the heating network through the eighth valve 8.

[0026] 1b. Heat release process: close the first valve 1, the fourth valve 4, the seventh valve 7, and the eighth valve 8, and open the other valves. The hot water in the tank flows out of the tank through the upper water distributor 12, the second valve 2, the fifth valve 5, and the hot water storage tank circulation pump 14, flows into the heat network circulating water supply pipeline through the sixth valve 6 and supplies heat to the outside, and the heat network circulating water return water flows into the tank through the third valve 3.

[0027] (2) The hot water tank exchanges heat with the heat network through the heat exchanger, the ninth valve 9 and the tenth valve 10 are opened, and the heat exchanger 15 is running.

[0028] 2a. Heat storage process: close the second valve 2, the third valve 3, the sixth valve 6, and the seventh valve 7, and open the other valves. The cold water at the bottom of the tank is discharged from the tank by the lower water distributor 13 through the first valve 1, the fifth valve 5, and the hot water storage tank circulation pump 14, and after mixing with the heat network circulating water return water from the eighth valve 8, it flows into the heat exchanger 15 through the ninth valve 9 for heating, and the heated hot water flows into the tank through the tenth valve 10 and the fourth valve 4.

[0029] 2b. Heat release process: close the first valve 1 and the fourth valve 4, and open the other valves. The hot water in the tank flows out of the tank through the upper water distributor 12, the second valve 2, the fifth valve 5 and the hot water storage tank circulation pump 14, flows into the heat network circulating water supply pipeline through the sixth valve 6, and mixes with the hot water from the tenth valve 10 and the seventh valve 7 after the heater to supply heat to the outside. The return water of the heat network circulating water flows into the tank through the third valve 3, and flows into the heater through the eighth valve 8 and the ninth valve 9 for heating.

Claims

1. An operation regulation method for a hot water storage tank for flexible peak regulation in a power plant, It is characterized in that An operation regulation system is adopted, the system comprising a heat storage tank (11), an upper water distributor (12) is provided at the upper part of the heat storage tank (11), and a lower water distributor (13) is provided at the lower part of the heat storage tank (11); The upper water distributor (12) is connected to the high-temperature water outlet pipe on the secondary side of the heat exchanger (15), and a fourth valve (4) and a tenth valve (10) are provided on the pipeline between the upper water distributor (12) and the high-temperature water outlet pipe on the secondary side; The lower water distributor (13) is connected to the low-temperature water inlet pipe on the secondary side of the heat exchanger (15), and a circulating pump (14) is provided on the pipeline between the lower water distributor (13) and the low-temperature water inlet pipe on the secondary side of the heat exchanger (15); A first valve (1) is provided on the pipeline between the lower water distributor (13) and the circulation pump (14), and a fifth valve (5) and a ninth valve (9) are provided on the pipeline between the circulation pump (14) and the low-temperature water inlet pipe on the secondary side of the heat exchanger (15); The primary side water inlet pipe of the heat exchanger (15) is connected to the electrode boiler water, and the primary side water outlet pipe of the heat exchanger (15) is connected to the electrode boiler return water; The pipeline between the first valve (1) and the circulation pump (14) is connected to the pipeline between the upper water distributor (12) and the fourth valve (4) through a first branch pipe, and the first branch pipe is provided with a second valve (2); The pipeline between the lower water distributor (13) and the first valve (1) is connected to the circulating water return of the heating network through a second branch pipe, and a third valve (3) is provided on the second branch pipe; The pipeline between the fifth valve (5) and the ninth valve (9) is connected to the circulating water supply of the heat network through the third branch pipe, and the sixth valve (6) is provided on the third branch pipe; The pipeline between the fourth valve (4) and the tenth valve (10) is connected to the circulating water supply of the heat network through a fourth branch pipe, and a seventh valve (7) is provided on the fourth branch pipe; The pipeline between the fifth valve (5) and the ninth valve (9) is connected to the return water of the heat network circulation water through the fifth branch pipe, and the eighth valve (8) is provided on the fifth branch pipe; The following method is used to store and release heat through the heat network: during the heat storage process: the second valve (2), the third valve (3) and the sixth valve (6) are closed, and the remaining valves are opened; the circulating water supply of the heat network flows into the heat storage tank (11) through the seventh valve (7) and the fourth valve (4); the cold water at the bottom of the heat storage tank (11) is discharged from the heat storage tank (11) through the lower water distributor (13) through the first valve (1), the fifth valve (5) and the circulating pump (14), and flows into the heat network circulation tank (11) through the eighth valve (8). Water return pipe; heat release process: close the first valve (1), the fourth valve (4), the seventh valve (7), and the eighth valve (8), and open the remaining valves; the hot water in the heat storage tank (11) flows out of the heat storage tank (11) through the upper water distributor (12) via the second valve (2), the fifth valve (5) and the circulation pump (14), flows into the heat network circulating water supply pipe through the sixth valve (6) and supplies heat to the outside, and the heat network circulating water return water flows into the heat storage tank (11) through the third valve (3); The following method is used to store and release heat through a heat exchanger and a heat network: during the heat storage process: the second valve (2), the third valve (3), the sixth valve (6), and the seventh valve (7) are closed, and the remaining valves are opened; cold water at the bottom of the heat storage tank (11) is discharged from the heat storage tank (11) through the lower water distributor (13) via the first valve (1), the fifth valve (5), and the circulating pump (14), and after mixing with the circulating water return water from the heat network from the eighth valve (8), it flows into the heat exchanger (15) through the ninth valve (9) for heating, and the heated hot water flows into the heat exchanger (15) through the tenth valve (10) and the fourth valve (4). The heat release process is as follows: the first valve (1) and the fourth valve (4) are closed, and the other valves are opened; the hot water in the heat storage tank (11) flows out of the heat storage tank (11) through the upper water distributor (12) via the second valve (2), the fifth valve (5) and the circulation pump (14), flows into the heat network circulating water supply pipeline through the sixth valve (6), and is mixed with the hot water from the tenth valve (10) and the seventh valve (7) after the heater to supply heat to the outside; part of the return water from the heat network circulating water flows into the tank through the third valve (3), and part of it flows into the heater through the eighth valve (8) and the ninth valve (9) for heating.

Images