CN202203924U - A hydrogen peroxide feeding device for boiler chemical cleaning in power plants - Google Patents

Abstract

A dosing device for hydrogen peroxide in the chemical cleaning of a power plant boiler, comprising a first dosing pump and a second dosing pump connected to a dosing box, and the inlet and outlet pipes of the first dosing pump and the second dosing pump The inlet valves of the first and second dosing pumps and the outlet valves of the first and second dosing pumps are respectively installed on the road. The outlet valves of the first and second dosing pumps are connected to the main outlet valve through pipelines, and the A first connecting valve and a second connecting valve are respectively installed between the pump inlet valve and the first and second dosing pumps, and the outlets of the first connecting valve and the second connecting valve are respectively connected to the second dosing pump 3 and the The outlets of a dosing pump are connected. The utility model is equipped with 2 dosing pumps, through the cooperative use of the 2 dosing pumps, one can be used and the other can be used, and can also be operated in parallel or in series, thus effectively solving the problem of passivation in boiler chemical cleaning A large amount of decomposition occurred during the process of adding the agent hydrogen peroxide to the cleaning system and the air lock formed by the gas generated after the decomposition.

Description

A dosing device for hydrogen peroxide in chemical cleaning of power plant boilers

technical field

The utility model relates to a dosing device, in particular to a dosing device for hydrogen peroxide in chemical cleaning of boilers in power plants.

Background technique

As an environmentally friendly passivator, hydrogen peroxide is more and more widely used in chemical cleaning of power plant boilers. However, due to its strong oxidizing properties and easy decomposition in passivation solution, there are various problems in its use.

At present, in the chemical cleaning of power plant boilers, there are mainly two ways to add hydrogen peroxide: one is to directly add hydrogen peroxide to the cleaning tank of the cleaning system. It is easy to decompose. On the one hand, it will cause a lot of waste of medicines. On the other hand, the gas generated by its decomposition will cause the air lock of the cleaning circulation pump and cause the circulation of the entire cleaning system to be poor. This will not only affect the passivation effect, but also It will cause overflow of the passivation solution; another way of adding is to use the dosing pump to add at the outlet of the cleaning pump. Although this method can solve the air lock problem of the cleaning pump, there are the following problems: 1) The hydrogen peroxide is in the dosing pump Decomposition will also occur in the body (carbon steel), which will cause the air lock of the dosing pump and directly affect the process of dosing; 3) If the operation of the dosing pump is not properly controlled, the outlet pressure of the dosing pump will be lower than the outlet pressure of the cleaning pump, which will also cause the passivation liquid to flow back into the dosing system and cause the hydrogen peroxide to decompose in a short time. Massive breakdown of time.

Utility model content

The purpose of the utility model is to provide a hydrogen peroxide dosing device in the chemical cleaning of the power plant boiler which can solve the gas plug phenomenon caused by the gasification in the pump body.

In order to achieve the above object, the technical scheme adopted by the utility model is: comprising the first dosing pump and the second dosing pump connected with the dosing box, at the inlet and outlet of the first dosing pump and the second dosing pump The inlet valves of the first and second dosing pumps and the outlet valves of the first and second dosing pumps are respectively installed on the pipelines. The outlet valves of the first and second dosing pumps are connected to the main outlet valve through the pipelines. A first connection valve and a second connection valve are respectively installed between the medicine pump inlet valve and the first and second dosing pumps, and the outlets of the first connection valve and the second connection valve are respectively connected to the second dosing pump 3, The outlets of the first dosing pump are connected.

The outlets of the first connecting valve and the second connecting valve of the utility model are also connected to the dosing box through the pipeline and the first and second recirculation valves installed on the pipeline;

The first and second pressure gauges are respectively installed on the pipelines before the inlet of the outlet valve of the first and second dosing pumps;

A check valve is also installed on the pipeline between the outlet valve of the first and second dosing pumps and the main outlet valve.

The utility model is equipped with two dosing pumps, and through the cooperative use of the two dosing pumps, it can be used for one use and one for standby, can also be operated in parallel or in series, thus effectively solving the problem of boiler chemical cleaning Problems such as the large amount of decomposition of the medium passivator hydrogen peroxide in the process of adding to the cleaning system and the gas lock formed by the gas generated after decomposition.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Referring to Fig. 1, the utility model comprises the first dosing pump 2 and the second dosing pump 3 connected with the dosing box 1, on the inlet and outlet pipelines of the first dosing pump 2 and the second dosing pump 3 The inlet valves 4 and 6 of the first and second dosing pumps, the first and second pressure gauges 12 and 13, the outlet valves 5 and 7 of the first and second dosing pumps, the outlet valves 5 and 7 of the first and second dosing pumps are installed respectively. 7 is communicated with the check valve 14 and the main outlet valve 15 through the pipeline, and the first connecting valves are respectively installed between the inlet valves 4 and 6 of the first and second dosing pumps and the first and second dosing pumps 2 and 3. Valve 11 and the second connecting valve 10, the outlets of the first connecting valve 11 and the second connecting valve 10 communicate with the outlets of the second dosing pump 3 and the first dosing pump 2 respectively through pipelines, the first connecting valve 11 and The outlet of the second connection valve 10 is also communicated with the dosing box 1 through the pipeline and the first and second recirculation valves 9 and 8 installed on the pipeline.

Its use process is shown in the figure:

(1) When the inlet valve 4 of the first dosing pump (the inlet valve 6 of the second dosing pump), the outlet valve 5 of the first dosing pump (the outlet valve 7 of the second dosing pump), and the main outlet valve 15 are opened, the second One dosing pump 2 (the second dosing pump 3) runs alone for dosing, and the second dosing pump 3 (the first dosing pump 2) is standby;

When the inlet valve 4 of the first dosing pump, the outlet valve 5 of the first dosing pump, the inlet valve 6 of the second dosing pump, the outlet valve 7 of the second dosing pump, and the main outlet valve 15 are opened, the first dosing pump 2 , the second dosing pump 3 runs in parallel to add medicine;

When the first dosing pump inlet valve 4 (the second dosing pump inlet valve 6), the second dosing pump outlet valve 7 (the first dosing pump outlet valve 5), the second connecting valve 10 (the first connecting valve 11 ), when the main outlet valve 15 is opened, the first dosing pump 2 and the second dosing pump 3 operate in series to add medicine.

(2) When gasification occurs in the main body due to the decomposition of hydrogen peroxide during the dosing process of the first dosing pump 2, close the first dosing pump inlet valve 4, open the first contact valve 11, and utilize the second dosing pump 3 to The gas in the first dosing pump 2 is ejected, thereby eliminating its air lock.

(3) The check door 14 can prevent the lye in the cleaning system from falling back into the dosing system and cause rapid decomposition of hydrogen peroxide.

Through the ingenious design of the utility model, the two dosing pumps in the test device can be used one for another, and can also be operated in parallel and simultaneously, and can also be operated in series at the same time. The air lock caused by the device system is reasonably designed, the layout is compact, the structure is simple, and the maintenance amount is small.

Claims (3)

1. the chemicals dosing plant of hydrogen peroxide solution in the boiler of power plant Chemical cleaning; It is characterized in that: comprise first dosing pump (2) and second dosing pump (3) that are connected with dosing tank (1); On the inlet of first dosing pump (2) and second dosing pump (3) and export pipeline, be separately installed with first and second dosing pump inlet valve (4,6) and first and second dosing pump outlet valve (5,7); First and second dosing pump outlet valve (5,7) is connected with outlet main valve (15) by the road; And between first and second dosing pump inlet valve (4,6) and first and second dosing pump (2,3), also be separately installed with first communication valve (11) and second communication valve (10); The outlet of first communication valve (11) and second communication valve (10) is connected with the outlet of second dosing pump (3), first dosing pump (2) respectively by the road, and the outlet of described first communication valve (11) and second communication valve (10) also reaches first and second recycle valve (9,8) that is installed on the pipeline by the road and is connected with dosing tank (1).

2. the chemicals dosing plant of hydrogen peroxide solution in the boiler of power plant Chemical cleaning according to claim 1 is characterized in that: also be separately installed with first and second Pressure gauge (12,13) on the pipeline before described first and second dosing pump outlet valve (5,7) inlet.

3. the chemicals dosing plant of hydrogen peroxide solution in the boiler of power plant Chemical cleaning according to claim 1 is characterized in that: on the pipeline between described first and second dosing pump outlet valve (5,7) and the outlet main valve (15) non-return valve (14) is installed also.

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