Uniform dosing maintenance system for standby boiler

Abstract

The utility model provides a uniform dosing maintenance system for a shutdown and standby boiler. The uniform dosing maintenance system for the shutdown and standby boiler comprises the boiler, a drain tank, a protection liquid metering tank and a boiler drum, a water outlet of the drain tank is communicated with a drain pump through a pipeline, a water outlet of the drain pump is communicated with a water conveying pipe, and a water outlet of the protection liquid metering tank is communicated with a dosing pump. The second branch pipe and the water conveying pipe are jointly communicated to a mixer, and a liquid outlet of the mixer is communicated to a boiler drum through a water feeding pipe. According to the uniform dosing maintenance system for the standby boiler, a protection liquid dosing point is additionally arranged behind the drain pump, the protection liquid is mixed by the mixer to become qualified boiler protection liquid, and the qualified boiler protection liquid and the boiler protection liquid are added into the boiler drum together, so that the purpose of uniformly adding the protection liquid to a water vapor pipeline of the standby boiler at any time is achieved; boiler protection liquid data can be detected at any time, the purpose of anti-corrosion protection can be well achieved, corrosion of a standby boiler is relieved, and the safe operation life of equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of boilers, in particular to a uniform dosing and maintenance system for a stopped or standby boiler. Background Art

[0002] During periods of downtime for maintenance or standby, thermal equipment's steam systems are inevitably exposed to the atmosphere and come into contact with corrosive substances, causing corrosion on the equipment's internal walls, seriously impacting the unit's operational safety and lifespan. Therefore, boilers require chemical maintenance during downtime. Wet maintenance involves applying a certain concentration of alkaline solution to the metal surfaces inside the boiler, forming an alkaline protective film to prevent corrosion.

[0003] Existing boilers are generally filled with water through a drain pump. The water in the drain tank is demineralized water that has not been treated with chemicals. The shutdown protection liquid is added to the steam drum through the phosphate dosing pipeline after the boiler is shut down. Due to the design and structure of the boiler, the protection liquid added to the steam drum cannot be evenly circulated into the water vapor system pipeline, which means that true shutdown protection cannot be achieved. The pH value of the liquid can only be sampled and tested after the liquid is added to the steam drum, and it is impossible to monitor the quality of the protection liquid in real time.

[0004] Therefore, it is necessary to provide a uniform dosing maintenance system for a stopped standby boiler to solve the above technical problems. Utility Model Content

[0005] The utility model provides a uniform dosing maintenance system for a stopped standby boiler, which solves the problem that the protective liquid cannot be uniformly circulated into the water vapor pipeline due to the structure of the existing boiler.

[0006] In order to solve the above technical problems, the utility model provides a uniform dosing maintenance system for a stopped standby boiler, comprising a boiler, a drain tank, a protective liquid metering tank and a boiler drum, the water inlet of the drain tank being connected to a water inlet pipe, the water outlet of the drain tank being connected to a drain pump through a pipeline, the water outlet of the drain pump being connected to a water supply pipe, the water outlet of the protective liquid metering tank being connected to a dosing pump, the liquid outlet of the dosing pump being connected to a liquid supply pipe, the liquid supply pipe being connected to a first branch pipe and a second branch pipe, the first branch pipe being connected to the boiler, the second branch pipe and the water supply pipe being connected to a mixer together, and the liquid outlet of the mixer being connected to the boiler drum through an upper water pipe.

[0007] Preferably, valves are provided on the first branch pipe and the second branch pipe respectively.

[0008] Preferably, the drain tank is connected to a water outlet pipe, the water outlet pipe is connected to a sampling branch pipe and an overflow branch pipe, and the sampling branch pipe is connected to a sampling water sump.

[0009] Preferably, one end of the water delivery pipe close to the drain pump is connected to a circulation pipe, and the other end of the circulation pipe is connected to the drain tank.

[0010] Preferably, a sampling device is provided on the water supply pipe.

[0011] Compared with the related art, the uniform dosing maintenance system for idle and standby boilers provided by the present invention has the following beneficial effects:

[0012] The utility model provides a uniform dosing maintenance system for a stopped standby boiler. After the overhaul of the stopped standby boiler is completed, water is added through a drain pump, and a protective liquid dosing point is added after the drain pump. The protective liquid is mixed in a mixer to become qualified boiler protective liquid and is added into the boiler steam drum. Not only can the protective liquid be uniformly added to the water vapor pipeline of the stopped standby boiler at any time, but the boiler protective liquid data can also be detected at any time, which can better achieve the purpose of anti-corrosion protection, slow down the corrosion of the standby boiler, increase the safe operation life of the equipment, and improve safety and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the pipeline structure of the utility model.

[0014] Numbers in the figure: 1. Drain tank, 2. Protective liquid metering tank, 3. Water inlet pipe, 4. Drain pump, 5. Water supply pipe, 6. Dosing pump, 7. Liquid infusion pipe, 71. First branch pipe, 72. Second branch pipe, 8. Boiler, 9. Boiler drum, 10. Mixer, 11. Water supply pipe, 12. Overflow branch pipe, 13. Sampling water collection tank, 14. Circulation pipe, 15. Sampling device, 16. Sampling branch pipe. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the accompanying drawings and implementation examples.

[0016] Please refer to Figure 1 , which is a schematic diagram of the piping structure of the present invention. The uniform dosing maintenance system for a stopped standby boiler includes a boiler 8, a drain tank 1, a protective liquid metering tank 2, and a boiler drum 9. The water inlet of the drain tank 1 is connected to a water inlet pipe 3, the water outlet of the drain tank 1 is connected to a drain pump 4 through a pipeline, the water outlet of the drain pump 4 is connected to a water supply pipe 5, the water outlet of the protective liquid metering tank 2 is connected to a dosing pump 6, the liquid outlet of the dosing pump 6 is connected to a liquid supply pipe 7, the liquid supply pipe 7 is connected to a first branch pipe 71 and a second branch pipe 72, the first branch pipe 71 is connected to the boiler 8, the second branch pipe 72 and the water supply pipe 5 are connected to a mixer 10, and the liquid outlet of the mixer 10 is connected to the boiler drum 9 through a water supply pipe 11.

[0017] The boiler drum is a cylindrical pressure vessel used in water-tube boilers for steam-water separation and steam purification, forming a water circulation loop and storing boiler water. It is a basic component in the boiler system. Its specific structure, installation and connection methods are existing mature technologies and will not be elaborated here.

[0018] The protective liquid metering tank 2, the dosing pump 6, the liquid infusion pipe 7, the first branch pipe 71 and the second branch pipe 72 constitute the dosing pipeline. The drain tank 1, the drain pump 4, the water infusion pipe 5 and the water supply pipe 11 constitute the water adding pipeline. The dosing pipeline is connected to the water adding pipeline and is located at the rear of the drain pump 4 to add the liquid medicine and water into the boiler drum 9 together.

[0019] The water in the drain tank 1 is transported to the boiler drum 9 through the drain pump 4, the water pipe 5 and the water supply pipe 11 for water supply.

[0020] The liquid medicine is drawn from the protective liquid metering tank 2 by the dosing pump 6 and output through the liquid infusion pipe 7. The first branch pipe 71 and the second branch pipe 72 are respectively provided with valves. By controlling the on and off of the two valves, the flow direction of the liquid medicine is controlled. When transported through the first branch pipe 71, it can be directly added to the boiler 8. When transported through the second branch pipe 72, the liquid medicine will enter the water adding pipeline, be mixed with water through the mixer 10, and then be added to the boiler drum 9 together, so that the liquid medicine can be evenly circulated in the water vapor system pipeline.

[0021] The mixer 10 is a tubular mixer.

[0022] The water inlet end of the water inlet pipe 3 is connected to the low-pressure expander, and water is supplied through the low-pressure expander.

[0023] The drain tank 1 is connected to a water outlet pipe, and the water outlet pipe is connected to a sampling branch pipe 16 and an overflow branch pipe 12 . The sampling branch pipe 16 is connected to a sampling water sump 13 .

[0024] A valve is provided on the sampling branch pipe 16, which can be opened to sample the water in the drain tank 1 through the sampling branch pipe 16. The sampled water flows into the sampling water collection tank 13 for sampling the water quality and subsequent testing.

[0025] The overflow branch pipe 12 is also provided with a valve. When the valve is opened, overflow can occur and the overflow water is discharged into the ditch.

[0026] One end of the water delivery pipe 5 close to the drain pump 4 is connected to a circulation pipe 14, and the other end of the circulation pipe 14 is connected to the drain tank 1. The circulation pipe 14 is also provided with a valve to return water to the drain tank 1.

[0027] The water supply pipe 11 is provided with a sampling device 15. The sampling device 15 is located behind the mixer 10 and can perform online sampling of the mixture of the protection liquid and water. In conjunction with monitoring equipment, it can detect the concentration and pH value of the protection liquid in real time to ensure that the protection liquid delivered to the standby boiler is qualified.

[0028] Compared with the related art, the uniform dosing maintenance system for idle and standby boilers provided by the present invention has the following beneficial effects:

[0029] After the maintenance of the idle (standby) boiler is completed, water is added through the drain pump 4, and a protective liquid adding point is added after the drain pump 4. The protective liquid is mixed by the mixer 10 to become qualified boiler protective liquid and added to the boiler steam drum 9. This not only achieves the purpose of evenly adding protective liquid to the water vapor pipeline of the idle (standby) boiler at any time, but also can detect the concentration, pH value and other data of the boiler protective liquid at any time, which can better achieve the purpose of anti-corrosion protection, slow down the corrosion of the standby boiler, increase the safe operation life of the equipment, and improve safety and stability.

[0030] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A uniform dosing maintenance system for a stopped or standby boiler, characterized by: The invention comprises a boiler (8), a drain tank (1), a protective liquid metering tank (2) and a boiler drum (9), wherein the water inlet of the drain tank (1) is connected to a water inlet pipe (3), the water outlet of the drain tank (1) is connected to a drain pump (4) through a pipeline, the water outlet of the drain pump (4) is connected to a water delivery pipe (5), the water outlet of the protective liquid metering tank (2) is connected to a dosing pump (6), the liquid outlet of the dosing pump (6) is connected to a liquid delivery pipe (7), the liquid delivery pipe (7) is connected to a first branch pipe (71) and a second branch pipe (72), the first branch pipe (71) is connected to the boiler (8), the second branch pipe (72) and the water delivery pipe (5) are connected to a mixer (10), and the liquid outlet of the mixer (10) is connected to the boiler drum (9) through a water supply pipe (11).

2. The uniform dosing maintenance system for a stopped or standby boiler according to claim 1 is characterized in that: The first branch pipe (71) and the second branch pipe (72) are respectively provided with valves.

3. The uniform dosing maintenance system for a stopped or standby boiler according to claim 1 is characterized in that: The water inlet end of the water inlet pipe (3) is connected to the low-pressure expander.

4. The uniform dosing maintenance system for a stopped or standby boiler according to claim 1 is characterized in that: The drain box (1) is connected to a water outlet pipe, the water outlet pipe is connected to a sampling branch pipe (16) and an overflow branch pipe (12), and the sampling branch pipe (16) is connected to a sampling water sump (13).

5. The uniform dosing maintenance system for a stopped or standby boiler according to claim 1 is characterized in that: One end of the water delivery pipe (5) close to the drain pump (4) is connected to a circulation pipe (14), and the other end of the circulation pipe (14) is connected to the drain tank (1).

6. The uniform dosing maintenance system for a stopped or standby boiler according to claim 1 is characterized in that: The water supply pipe (11) is provided with a sampling device (15).

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