Piping system of the auxiliary steam header of the boiler
The boiler's piping system redirects SCR steam from soot blow steam to the auxiliary steam header, addressing leak-induced failures by maintaining steam supply and simplifying control, thus ensuring operational continuity.
Patent Information
- Application Number
- JP2025001753U
- Authority / Receiving Office
- JP · JP
- Patent Type
- Utility models
- Current Assignee / Owner
- Priority Date
- 2024-06-18
- Filing Date
- 2025-05-30
- Publication Date
- 2025-07-28
- Estimated Expiration
- 2035-05-30
AI Technical Summary
Existing boiler systems cannot shut off the auxiliary steam header during operation due to continuous SCR steam supply, leading to operation failures when leaks occur, as SCR steam is solely supplied from this header.
A piping system that redirects SCR steam from the boiler's soot blow steam to the auxiliary steam header, utilizing valves and connections to ensure continuous steam supply even when the auxiliary steam header leaks, including a soot blow steam connection, auxiliary steam header connection, soot blower, and denitration SCR steam inlet valve configurations.
Prevents operation failures by enabling the diversion of SCR steam from the boiler's soot blow steam, maintaining system functionality despite leaks in the auxiliary steam header, and simplifies piping by removing check valves and optimizing valve control.
Smart Images
Figure 0003252187000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of boiler denitration SCR, and particularly to the piping system of the auxiliary steam header of the boiler.
Background Art
[0002] Currently, the uses of the auxiliary steam header of the boiler include supplying steam for extinguishing the pulverized coal mill, heat tracing steam for preventing freezing in thermodynamics, purge steam for the light oil system, denitration SCR auxiliary steam, auxiliary steam for the soot blower of the air preheater, auxiliary steam for the B heater of the pulverized coal mill, chemical auxiliary steam, soot blow auxiliary steam for the exhaust gas cooler, urea area auxiliary steam, hopper heating steam for the electrostatic precipitator, MGGH auxiliary heating steam, and steam for MGGH exhaust gas soot blowing. During the operation of the unit, the steam of the denitration dilution air heater in the denitration SCR auxiliary steam is continuously supplied and the steam cannot be stopped. Therefore, during the operation of the unit, the auxiliary steam header of the boiler cannot be shut off for troubleshooting. The remaining auxiliary steam headers of the boiler can be stopped for a short time.
[0003] Currently, since the SCR steam can only be supplied from the auxiliary steam header of the boiler, when there is a leak or other defect in the auxiliary steam header of the boiler, it cannot be shut off during the operation of the unit to remove the fault.
Summary of the Invention
Problems to be Solved by the Invention
[0004] The object of the present invention is to supply SCR steam by utilizing the soot blow steam of the boiler body in order to prevent operation failures caused by leaks in the auxiliary steam header of the boiler, so that SCR steam can be supplied even when the auxiliary steam header is stopped, and to provide a piping system for the auxiliary steam header of the boiler that can prevent operation failures caused by leaks in the auxiliary steam header of the boiler.
[0005] The object of the present invention can be achieved by the following technical solutions.
[0006] A piping system for the auxiliary steam header of a boiler, including a soot blow steam connection port of the boiler body, an auxiliary steam header connection port of the boiler, a soot blower of the economizer, a manual steam inlet valve for soot blow assistance of the air preheater, an electric steam inlet valve for soot blow assistance of the air preheater, an auxiliary steam inlet valve for the soot blower of the air preheater, a denitration SCR auxiliary steam inlet valve, and a denitration SCR steam connection port. The soot blow steam connection port of the boiler body is connected to one end of the electric steam inlet valve for soot blow assistance of the air preheater. The other end of the electric steam inlet valve for soot blow assistance of the air preheater is connected to one end of the manual steam inlet valve for soot blow assistance of the air preheater. The other end of the manual steam inlet valve for soot blow assistance of the air preheater is connected to one end of the auxiliary steam inlet valve for the soot blower of the air preheater. The other end of the auxiliary steam inlet valve for the soot blower of the air preheater is connected to the auxiliary steam header connection port of the boiler. The connection part between the auxiliary steam inlet valve for the soot blower of the air preheater and the manual steam inlet valve for soot blow assistance of the air preheater is connected to one end of the denitration SCR auxiliary steam inlet valve.
[0007] Furthermore, the other end of the denitration SCR auxiliary steam inlet valve is connected to the denitration SCR steam connection port.
[0008] Furthermore, the diameter of the pipe between the denitration SCR auxiliary steam inlet valve and the denitration SCR steam connection port is smaller than the diameter of the pipe from the soot blow steam connection port of the boiler body to the denitration SCR auxiliary steam inlet valve.
[0009] Furthermore, the diameter of the pipe between the denitration SCR auxiliary steam inlet valve and the denitration SCR steam connection port is DN65.
[0010] Furthermore, the pressure of the steam output from the soot blow steam connection port of the boiler body is equal to the pressure of the steam output from the auxiliary steam header connection port of the boiler.
[0011] Furthermore, the temperature of the steam output from the soot blow steam connection port of the boiler body is equal to the temperature of the steam output from the auxiliary steam header connection port of the boiler.
[0012] Furthermore, the soot blow steam connection port of the boiler body is connected to one end of the soot blower of the economizer, and the other end of the soot blower of the economizer is connected to one end of the electric steam inlet valve for auxiliary soot blowing of the air preheater.
[0013] Furthermore, the connection part between the soot blower of the economizer and the electric steam inlet valve for auxiliary soot blowing of the air preheater is connected to one end of the soot blower of the air preheater.
[0014] Furthermore, the other end of the soot blower of the air preheater is connected to the soot blow steam discharge connection port of the air preheater.
[0015] Furthermore, the soot blow steam connection port of the boiler body is connected to the denitration soot blow steam connection port.
[0016] Compared with the prior art, the present invention has the following beneficial effects.
[0017] The present invention provides SCR steam by utilizing the soot blow steam of the boiler body. The source of the SCR steam may be the soot blow steam of the boiler body or the auxiliary steam header of the boiler. Compared with the conventional system that supplies SCR steam only through the auxiliary steam header of the boiler, when a leak occurs in the auxiliary steam header of the boiler, the present invention can open the electric steam inlet valve for auxiliary soot blowing of the air preheater and the manual steam inlet valve for auxiliary soot blowing of the air preheater, close the auxiliary steam inlet valve for the soot blower of the air preheater, and switch the steam source of the denitration SCR auxiliary steam inlet valve from the auxiliary steam header of the boiler to the soot blow steam of the boiler body, so as to prevent operation failures caused by leaks in the auxiliary steam header of the boiler.
Brief Description of the Drawings
[0018]
Figure 1
Figure 2
Embodiments for Carrying out the Invention
[0019] Hereinafter, the present invention will be described in detail in conjunction with the accompanying drawings and specific examples. This example is implemented based on the technical solution of the present invention and provides a detailed embodiment and a specific operation process, but the protection scope of the present invention is not limited to the following examples.
[0020] As shown in Figure 2, currently, it is a schematic diagram of the piping structure of the auxiliary steam header of a conventional boiler. In Figure 2, SCR steam is supplied only through the auxiliary steam header of the boiler. The problem with this system is that when a leak occurs in the auxiliary steam header of the boiler, it is impossible to perform the operation of shutting it off and eliminating the failure, which causes problems in the operation of the system.
[0021] The present invention provides a piping system for the auxiliary steam header of a boiler. As shown in Figure 1, the system includes a soot blow steam connection port of the boiler body, an auxiliary steam header connection port of the boiler, a soot blower of the economizer, a manual steam inlet valve for auxiliary soot blow of the air preheater, an electric steam inlet valve for auxiliary soot blow of the air preheater, an auxiliary steam inlet valve for the soot blower of the air preheater, a denitration SCR auxiliary steam inlet valve, and a denitration SCR steam connection port. The soot blow steam connection port of the boiler body is connected to one end of the electric steam inlet valve for auxiliary soot blow of the air preheater. The other end of the electric steam inlet valve for auxiliary soot blow of the air preheater is connected to one end of the manual steam inlet valve for auxiliary soot blow of the air preheater. The other end of the manual steam inlet valve for auxiliary soot blow of the air preheater is connected to one end of the auxiliary steam inlet valve for the soot blower of the air preheater. The other end of the auxiliary steam inlet valve for the soot blower of the air preheater is connected to the auxiliary steam header connection port of the boiler. The connection part between the auxiliary steam inlet valve for the soot blower of the air preheater and the manual steam inlet valve for the soot blow auxiliary of the air preheater is connected to one end of the denitration SCR auxiliary steam inlet valve.
[0022] The other end of the denitration SCR auxiliary steam inlet valve is connected to the denitration SCR steam connection port.
[0023] The diameter of the pipe between the denitration SCR auxiliary steam inlet valve and the denitration SCR steam connection port is smaller than the diameter of the pipe from the soot blow steam connection port of the boiler body to the denitration SCR auxiliary steam inlet valve.
[0024] The diameter of the pipe between the denitration SCR auxiliary steam inlet valve and the denitration SCR steam connection port is DN65.
[0025] The pressure of the steam output from the soot blow steam connection port of the boiler body is equal to the pressure of the steam output from the auxiliary steam header connection port of the boiler.
[0026] The temperature of the steam output from the soot blow steam connection port of the boiler body is equal to the temperature of the steam output from the auxiliary steam header connection port of the boiler.
[0027] The soot blow steam connection port of the boiler body is connected to one end of the soot blower of the economizer, and the other end of the soot blower of the economizer is connected to one end of the electric steam inlet valve for the soot blow auxiliary of the air preheater.
[0028] The connection part between the soot blower of the economizer and the electric steam inlet valve for the soot blow auxiliary of the air preheater is connected to one end of the soot blower of the air preheater.
[0029] The other end of the soot blower of the air preheater is connected to the soot blow steam discharge connection port of the air preheater.
[0030] The soot blow steam connection port of the boiler body is connected to the denitration soot blow steam connection port.
[0031] In this invention, by opening the electric steam inlet valve for soot blow assist of the air preheater and the manual steam inlet valve for soot blow assist of the air preheater, and closing the auxiliary steam inlet valve for the soot blower of the air preheater, the steam source of the denitration SCR auxiliary steam inlet valve can be switched from the auxiliary steam header of the boiler to the soot blow steam of the boiler body.
[0032] The steam of the auxiliary steam header of the boiler is supplied from the secondary low-temperature reheater inlet, and the rated parameters are 435 °C and 3.13 MPa. The soot blow steam of the boiler body is supplied from the primary low-temperature reheater inlet, and the rated parameters are 431 °C and 10.69 MPa. The temperatures of the steam sources of the two channels are close. The soot blow steam of the boiler body can reduce the steam source pressure to the auxiliary steam pressure through the soot blow steam regulating valve of the boiler body. Therefore, the steam pressures and temperatures of these two channels can be adjusted to be consistent according to the operating conditions of the equipment.
[0033] The diameter of the air supply pipe of the denitration SCR auxiliary steam inlet valve is DN65. After optimizing the piping, the air supply pipe from the soot blow steam pipe of the boiler body to the denitration SCR auxiliary steam inlet valve is larger than DN65, indicating that the soot blow steam of the boiler body can meet the required flow rate of the denitration SCR auxiliary steam.
[0034] At the same time, this invention removes the check valve in Figure 2. With the dual valve control of the electric steam inlet valve for soot blow assist of the air preheater and the manual steam inlet valve for soot blow assist of the air preheater, there is no reverse flow and the piping is simplified.
[0035] The preferred embodiments of the present invention have been described in detail above. It should be understood by those skilled in the art that many modifications and changes can be made based on the concept of the present invention without creative efforts. Therefore, any technical solutions that can be obtained by those skilled in the art through logical analysis, inference, or limited experiments based on the concept of the present invention and based on the prior art should be within the protection scope defined by the claims.
Claims
1. A piping system for the auxiliary steam header of a boiler, including the soot blow steam connection port of the boiler body, the auxiliary steam header connection port of the boiler, the soot blower of the economizer, the manual steam inlet valve for the soot blow auxiliary of the air preheater, the electric steam inlet valve for the soot blow auxiliary of the air preheater, the auxiliary steam inlet valve for the soot blower of the air preheater, the denitration SCR auxiliary steam inlet valve, and the denitration SCR steam connection port, The soot blow steam connection port of the boiler body is connected to one end of the electric steam inlet valve for the soot blow auxiliary of the air preheater, the other end of the electric steam inlet valve for the soot blow auxiliary of the air preheater is connected to one end of the manual steam inlet valve for the soot blow auxiliary of the air preheater, the other end of the manual steam inlet valve for the soot blow auxiliary of the air preheater is connected to one end of the auxiliary steam inlet valve for the soot blower of the air preheater, and the other end of the auxiliary steam inlet valve for the soot blower of the air preheater is connected to the auxiliary steam header connection port of the boiler, A piping system for the auxiliary steam header of a boiler, characterized in that the connection part between the auxiliary steam inlet valve for the soot blower of the air preheater and the manual steam inlet valve for the soot blow auxiliary of the air preheater is connected to one end of the denitration SCR auxiliary steam inlet valve.
2. The piping system for the auxiliary steam header of a boiler according to Claim 1, characterized in that the other end of the denitration SCR auxiliary steam inlet valve is connected to the denitration SCR steam connection port.
3. The piping system for the auxiliary steam header of a boiler according to Claim 2, characterized in that the diameter of the pipe between the denitration SCR auxiliary steam inlet valve and the denitration SCR steam connection port is smaller than the diameter of the pipe from the soot blow steam connection port of the boiler body to the denitration SCR auxiliary steam inlet valve.
4. The piping system for the auxiliary steam header of a boiler according to Claim 3, characterized in that the diameter of the pipe between the denitration SCR auxiliary steam inlet valve and the denitration SCR steam connection port is DN65.
5. The piping system for the auxiliary steam header of a boiler according to Claim 2, characterized in that the pressure of the steam output from the soot blow steam connection port of the boiler body is equal to the pressure of the steam output from the auxiliary steam header connection port of the boiler.
6. The piping system for the auxiliary steam header of a boiler according to Claim 5, characterized in that the temperature of the steam output from the soot blow steam connection port of the boiler body is equal to the temperature of the steam output from the auxiliary steam header connection port of the boiler.
7. The soot blow steam connection port of the boiler body is connected to one end of the soot blower of the economizer, and the other end of the soot blower of the economizer is connected to one end of the electric steam inlet valve for supplementary soot blowing of the air preheater. The piping system of the auxiliary steam header of the boiler according to claim 1, characterized in that.
8. The connection part between the soot blower of the economizer and the electric steam inlet valve for supplementary soot blowing of the air preheater is connected to one end of the soot blower of the air preheater. The piping system of the auxiliary steam header of the boiler according to claim 7, characterized in that.
9. The other end of the soot blower of the air preheater is connected to the soot blow steam discharge connection port of the air preheater. The piping system of the auxiliary steam header of the boiler according to claim 8, characterized in that.
10. The soot blow steam connection port of the boiler body is connected to the denitration soot blow steam connection port. The piping system of the auxiliary steam header of the boiler according to claim 1, characterized in that.