A boiler steam soot blowing control method

Abstract

The present application relates to a boiler steam sootblowing control method, which relates to the technical field of cleaning, and includes a plurality of sootblowers. The sootblowers currently in operation are assumed to be sootblowers A, and the sootblowers waiting to work are assumed to be sootblowers B. The time when sootblowers B start working is the time period from when sootblowers A start to reduce the flow rate until they completely stop. The present application has the advantage of being able to extend the service life of sootblowing equipment.

Description

Technical Field

[0001] The present application relates to the technical field of cleaning, and in particular to a boiler steam soot blowing control method. Background Art

[0002] Steam soot blowing is a common method for removing soot from the heating surface in circulating fluidized bed boilers. It uses steam as the soot blowing medium and sprays steam onto the heating surface through a soot blower to remove the soot on the surface. This method is effective and can significantly improve the thermal efficiency of the boiler. However, the service life of existing soot blowing equipment is relatively low. Summary of the invention

[0003] In view of the deficiencies in the prior art, one of the objectives of the present application is to provide a boiler steam sootblowing control method, which has the advantage of being able to extend the service life of the sootblowing equipment.

[0004] The above-mentioned purpose of the present application is achieved through the following technical solutions:

[0005] A boiler steam sootblowing control method includes multiple sootblowers. The sootblowers currently in operation are assumed to be sootblowers A, and the sootblowers waiting to work are assumed to be sootblowers B. The time when sootblowers B start working is the time period from when sootblowers A start to reduce the flow rate until they completely stop.

[0006] By adopting the above technical solution, during use, when soot blower A starts to reduce the flow rate, soot blower B starts to work, so that the flow rate is more stable, thereby reducing the probability of shortening the service life of the equipment due to drastic flow changes.

[0007] In a preferred example, the present application may be further configured as follows: the time when soot blower B starts to work is the time when soot blower A starts to reduce the flow rate.

[0008] By adopting the above technical solution, the change of flow rate can be made more stable.

[0009] In a preferred example, the present application can be further configured as follows: it also includes an air source and a pressure pool, the air source and the pressure pool are connected by a pipeline, a valve Z is provided on the pipeline connecting the air source and the pressure pool, the pressure pool and multiple soot blowers are connected, the valve on soot blower A is valve A, the valve on soot blower B is valve B, the openings of valves A, B and Z are obtained, and the pressure in the pressure pool is obtained, when the pressure in the pressure pool is greater than a preset value, the openings of valves A and B are judged, if both meet the standards, the openings of valves Z are reduced, if the openings of valves A do not meet the standards, a corresponding notification is made, if the openings of valves B do not meet the standards, a corresponding notification is made, and if the openings of valves A and B do not meet the standards, a corresponding notification is made.

[0010] By adopting the above technical solution, the pressure pool and the openings of valves A, B and Z are monitored, and the opening of valve Z is adjusted, thereby reducing the probability of excessive pressure in the pressure pool.

[0011] In a preferred example, the present application can be further configured as follows: a pressure relief tank is also provided on the pressure tank, the pressure relief tank is made of elastic material, the pressure relief tank and the pressure tank are connected through valve X, and when the opening of valve B is compared with the maximum opening, if the difference is within a preset range, valve X is turned on and the opening of valve Z remains unchanged.

[0012] By adopting the above technical solution, that is, when the difference is within a preset range, the pressure of the pressure tank is adjusted through the pressure relief tank, so there is no need to adjust the opening of the valve Z, thereby extending the service life of the valve Z.

[0013] In a preferred example, the present application can be further configured as follows: when the opening of valve B reaches the maximum, the pressure in the pressure pool and the flow rate discharged by valve Z per unit time are obtained, and through calculation, if the pressure in the pressure pool is insufficient, the opening of valve Z is adjusted to the maximum until the pressure in the pressure pool reaches the minimum standard; if the pressure in the pressure pool is excessive and the opening of valve Z is greater than the standard opening, the time T required for valve B to discharge gas and restore the pressure pool to the standard pressure when valve Z is closed is calculated, and the opening of valve Z is adjusted so that the opening of valve Z is equal to the standard opening M, the standard opening M is less than the standard opening, and the time taken is less than time T.

[0014] By adopting the above technical solution, that is, by calculating the time T and adjusting the opening of the valve Z based on the time T, the adjustment of the valve Z can be more gentle, thereby reducing the probability of damage to the valve Z.

[0015] In a preferred example, the present application can be further configured as follows: if the pressure in the pressure pool is excessive and the opening of valve Z is less than the standard opening, calculate the time T required for valve B to discharge gas to restore the pressure pool to the standard pressure when valve Z is closed, and adjust the opening of valve Z so that the opening of valve Z is equal to the standard opening, and the time taken is greater than time T.

[0016] By adopting the above technical solution, that is, by calculating the time T and adjusting the opening of the valve Z based on the time T, the adjustment of the valve Z can be more gentle, thereby reducing the probability of damage to the valve Z.

[0017] In a preferred example, the present application can be further configured as follows: when valve X is turned on, if the pressure in the pressure pool is excessive and the opening of valve Z is greater than the standard opening, calculate the time T required for valve B to discharge gas to restore the pressure pool to the standard pressure when valve Z is closed, adjust the opening of valve Z so that the opening of valve Z is equal to the standard opening M, the standard opening M is less than the standard opening, and the time taken is greater than time T. When the pressure in the pressure pool is equal to the standard value, then close valve X.

[0018] By adopting the above technical solution, after the gas in the pressure relief pool is completely discharged, the valve X is closed, so as to facilitate the pressure division effect next time. DETAILED DESCRIPTION

[0019] The application discloses a boiler steam sootblowing control method, including a sootblowing device, which includes an air source, a pressure tank, a pressure relief tank and a plurality of sootblowers. The pressure tank is a sealed container, and the pressure relief tank is made of elastic material and is in the shape of a flat capsule. The air source and the pressure tank are connected through a pipeline, and a valve Z is provided on the pipeline. The pressure tank and the pressure relief tank are connected through a pipeline, and a valve X is provided on the pipeline. The pressure tank is also connected to a plurality of sootblowers. The sootblower currently in operation is assumed to be sootblower A, and the sootblower waiting to work is assumed to be sootblower B. The valve on sootblower A is valve A, and the valve on sootblower B is valve B.

[0020] The time when soot blower B starts to work is the time period from when soot blower A starts to reduce the flow rate (i.e., the opening of valve A starts to decrease) to when it completely stops (i.e., valve A is closed). More specifically, the time when soot blower B starts to work is the time when soot blower A starts to reduce the flow rate.

[0021] In order to further reduce the adjustment of the opening of valve Z, the openings of valves A, B and Z are obtained, and the pressure in the pressure pool is obtained. When the pressure in the pressure pool is greater than the preset value, the openings of valves A and B are judged. If both meet the standards, the opening of valve Z is reduced. If the opening of valve A does not meet the standards, a corresponding notification is made. If the opening of valve B does not meet the standards, a corresponding notification is made. If the openings of valves A and B do not meet the standards, a corresponding notification is made.

[0022] When the opening of valve B reaches the maximum, the pressure in the pressure pool and the flow rate discharged by valve Z per unit time are obtained. Through calculation, if the pressure in the pressure pool is insufficient, the opening of valve Z is adjusted to gradually increase to the maximum until the pressure in the pressure pool reaches the minimum standard (the minimum standard is less than the standard), and then valve Z gradually returns to the standard opening. During this process, the pressure in the pressure pool is not greater than the maximum standard (the maximum standard is greater than the standard). If the pressure in the pressure pool is excessive (that is, greater than the maximum standard) and the opening of valve Z is greater than the standard opening, calculate the time T required for valve B to discharge gas and restore the pressure pool to the standard pressure when valve Z is closed, adjust the opening of valve Z so that the opening of valve Z is equal to the standard opening M, the standard opening M is less than the standard opening, and the time it takes is less than time T until the pressure in the pressure pool returns to the maximum standard. Then, the remaining operating time of the current soot blower is obtained and calculated. If the pressure in the pressure pool is not less than the minimum standard when the current soot blower ends its operation, the current opening of valve Z is maintained, otherwise it is adjusted to the standard opening. If the pressure in the pressure pool is excessive (i.e. greater than the maximum standard) and the opening of valve Z is less than the standard opening, adjust the opening of valve Z so that the opening of valve Z is equal to the standard opening, and the time used is greater than time T until the pressure in the pressure pool returns to the standard pressure.

[0023] When valve X is on, if the pressure in the pressure pool is excessive and the opening of valve Z is greater than the standard opening, calculate the time T required for valve B to discharge gas and restore the pressure pool to the standard pressure when valve Z is closed, adjust the opening of valve Z so that the opening of valve Z is equal to the standard opening M, the standard opening M is less than the standard opening, and the time taken is greater than time T. When the pressure in the pressure pool is equal to the standard value (maximum standard), then close valve X. When the pressure pool is at the maximum standard, the pressure relief pool is in a non-stretched state, that is, the initial flat sac shape.

[0024] The implementation principle of this embodiment is: by adjusting the pressure during use, the valve Z will not quickly switch from a large opening to a small opening and then from a small opening to a large opening in a short period of time, thereby extending the service life of the valve Z.

[0025] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A boiler steam soot blowing control method, characterized in that: It includes multiple soot blowers, assuming that the soot blower currently working is soot blower A, and the soot blower waiting to work is soot blower B, then the time when soot blower B starts working is the time period from when soot blower A starts to reduce the flow rate to when it completely stops; the time when soot blower B starts working is the time when soot blower A starts to reduce the flow rate; it also includes an air source and a pressure pool, the air source and the pressure pool are connected through a pipeline, a valve Z is arranged on the pipeline connecting the air source and the pressure pool, the pressure pool and multiple soot blowers are connected, assuming that the valve on soot blower A is valve A, and the valve on soot blower B is valve B, the openings of valve A, valve B and valve Z are obtained, and the pressure in the pressure pool is obtained, when the pressure in the pressure pool is greater than a preset value, the openings of valve A and valve B are judged, if both meet the standards, the opening of valve Z is reduced, if the opening of valve A does not meet the standards, a corresponding notification is made, if the opening of valve B does not meet the standards, a corresponding notification is made, if the opening of valve A and the opening of valve B do not meet the standards, a corresponding notification is made.

2. A boiler steam sootblowing control method according to claim 1, characterized in that: A pressure relief tank is also provided on the pressure tank. The pressure relief tank is made of elastic material. The pressure relief tank and the pressure tank are connected through valve X. When the opening of valve B is compared with the maximum opening, if the difference is within the preset range, valve X is turned on and the opening of valve Z remains unchanged.

3. A boiler steam sootblowing control method according to claim 2, characterized in that: When the opening of valve B reaches the maximum, obtain the pressure in the pressure pool and the flow rate discharged by valve Z per unit time. Through calculation, if the pressure in the pressure pool is insufficient, adjust the opening of valve Z to the maximum until the pressure in the pressure pool reaches the minimum standard. If the pressure in the pressure pool is excessive and the opening of valve Z is greater than the standard opening, calculate the time T required for valve B to discharge gas and restore the pressure pool to the standard pressure when valve Z is closed, and adjust the opening of valve Z so that the opening of valve Z is equal to the standard opening M, the standard opening M is less than the standard opening, and the time taken is less than time T.

4. A boiler steam sootblowing control method according to claim 3, characterized in that: If the pressure in the pressure pool is excessive and the opening of valve Z is less than the standard opening, calculate the time T required for valve B to discharge gas and restore the pressure pool to the standard pressure when valve Z is closed, and adjust the opening of valve Z so that the opening of valve Z is equal to the standard opening, and the time taken is greater than time T.

5. A boiler steam sootblowing control method according to claim 3, characterized in that: When valve X is turned on, if the pressure in the pressure pool is excessive and the opening of valve Z is greater than the standard opening, calculate the time T required for valve B to discharge gas and restore the pressure pool to the standard pressure when valve Z is closed, and adjust the opening of valve Z so that the opening of valve Z is equal to the standard opening M. The standard opening M is less than the standard opening, and the time taken is greater than time T. When the pressure in the pressure pool is equal to the standard value, then close valve X.