Interlocking boiler fuel oil system capable of preventing overpressure
By introducing the fuel return regulating valve module into the DCS system to control the boiler fuel system pressure, the fuel pipeline overpressure problem was solved and safe and reliable fuel system operation was achieved.
Patent Information
- Application Number
- CN202423242804.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-12-27
AI Technical Summary
During the startup phase or low load, the boiler fuel system is prone to fuel pipeline overpressure, which can lead to increased pipeline stress or oil leakage, and even cause fire accidents.
Adopt the logic interlocking function within the DCS, add a fuel return regulating valve module, and control the fuel system pressure within the set range through the boiler fuel return regulating circuit and the fuel supply pressure monitoring circuit to prevent overpressure.
It effectively prevents overpressure in the fuel system, ensures stable atomization and ignition of the oil gun, and ensures the safety of the fuel system without any additional cost investment.
Smart Images
Figure CN223470227U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of boiler fuel oil system of thermal power plant, and particularly relates to an interlocking boiler fuel oil system for preventing overpressure. BACKGROUND
[0002] The boiler fuel oil system mainly functions to ignite the coal-fired boiler by using combustion-supporting oil in the starting stage, to stabilize combustion by using fuel oil in the low load and when burning poor-quality coal, to improve the combustion condition in the furnace, and to prevent boiler blowout accidents. If the pressure is not adjusted in time when the oil gun is put into or taken out, the fuel oil pump is switched or the oil pressure is low, the overpressure of the fuel oil pipeline is easily caused, which, in a light case, affects the pipeline stress and shortens the pipeline life, and, in a serious case, affects the fuel oil pipeline leakage and causes fire accidents. SUMMARY
[0003] The present application aims to provide an interlocking boiler fuel oil system for preventing overpressure, which can ensure that the fuel oil pressure is within a controllable range and prevent the overpressure of the fuel oil system pipeline and serious accidents.
[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme.
[0005] The present application relates to the field of boiler fuel oil system of thermal power plant, and particularly relates to an interlocking boiler fuel oil system for preventing overpressure.
[0006] Further, the boiler fuel oil return regulation circuit comprises a first selector SEL, an adder ADD and a second selector SEL connected in sequence, the input end of the boiler fuel oil return regulation circuit is connected with the boiler fuel oil pressure high interlocking open fuel oil return regulation valve signal, the boiler fuel oil return regulation valve position signal and the boiler fuel oil return regulation valve position signal, and the output end is connected with the tracking point TP of the HSVMAN hand controller.
[0007] Further, the first input end of the first selector SEL is connected with the boiler fuel oil pressure high interlocking open fuel oil return regulation valve signal, the second input end is connected with the boiler fuel oil return regulation valve position signal, the third input end and the output end are connected with the first path input of the adder ADD; the other path input of the adder ADD is connected with the fuel oil return regulation valve position opening signal, and the output is connected with the third input end of the second selector SEL; the first input end of the second selector SEL is connected with the boiler fuel oil supply pressure monitoring circuit, the second input end is connected with the boiler fuel oil return regulation valve position signal, and the output is connected with the tracking point TP of the HSVMAN hand controller.
[0008] Further, the boiler fuel oil supply pressure monitoring circuit comprises a third selector SEL, a comparison module GT, a comparison module LE, a logic AND and an RS flip-flop, the input end is connected with the boiler fuel oil supply pressure signal and the boiler fuel oil return valve interlock signal, and the output end is connected with the HSVMAN hand controller tracking switch TS.
[0009] Further, the first input end and the second input end of the third selector are connected with the boiler fuel oil supply pressure signal, and the third input end is connected with the output end.
[0010] The first input end of the comparison module GT is connected with the output end of the third selector SEL, and the second input end is connected with the upper limit threshold signal of the fuel oil supply pressure.
[0011] The first input end of the comparison module LE is connected with the output end of the third selector SEL, the second input end is connected with the lower limit threshold signal of the fuel oil supply pressure, and the output end is connected with the reset end I2 of the RS flip-flop.
[0012] The first input end of the logic AND is connected with the boiler fuel oil return valve interlock signal, the second input end is connected with the output end of the comparison module GT, and the output end is connected with the set end I1 of the RS flip-flop.
[0013] The output end of the RS flip-flop DV is connected with the HSVMAN hand controller tracking switch TS.
[0014] Further, the starting circuit comprises the boiler fuel oil return valve signal connected with the input end PV of the HSVMAN hand controller and the boiler fuel oil return valve position signal connected with the input end FB of the HSVMAN hand controller.
[0015] The present application has the advantages that: the present application utilizes the logic interlocking function in the DCS, adds the module for opening the fuel oil return valve for pressure relief when the fuel oil is raised in the DCS fuel oil system, and maintains the pressure of the boiler fuel oil system in the set range, so that the oil gun atomization ignition is stable, the fuel oil system overpressure is prevented, the safety of the fuel oil system is ensured, and no relevant cost is invested. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 The figure is the connection diagram of the interlocking boiler fuel oil system logic circuit for preventing overpressure. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
[0018] The interlocking boiler fuel oil system for preventing overpressure is shown in the figure. Figure 1The boiler fuel oil return regulation circuit comprises a first selector SEL, an adder ADD and a second selector SEL connected in sequence, the first input end of the first selector SEL is connected with the signal of the high connection fuel oil return regulation valve of the boiler fuel oil pressure, the second input end is connected with the valve position signal of the boiler fuel oil return regulation valve, the third input end and the output end are connected with the first path input of the adder ADD; the other path input of the adder ADD is connected with the valve position opening signal of the fuel oil return regulation valve, and the output is connected with the third input end of the second selector SEL; the first input end of the second selector SEL is connected with the boiler fuel oil supply pressure monitoring circuit, the second input end is connected with the valve position signal of the boiler fuel oil return regulation valve, and the output is connected with the tracking quantity point TP of the HSVMAN hand controller.
[0019] The boiler fuel oil return regulation circuit comprises a first selector SEL, an adder ADD and a second selector SEL connected in sequence, the first input end of the first selector SEL is connected with the signal of the high connection fuel oil return regulation valve of the boiler fuel oil pressure, the second input end is connected with the valve position signal of the boiler fuel oil return regulation valve, the third input end and the output end are connected with the first path input of the adder ADD; the other path input of the adder ADD is connected with the valve position opening signal of the fuel oil return regulation valve, and the output is connected with the third input end of the second selector SEL; the first input end of the second selector SEL is connected with the boiler fuel oil supply pressure monitoring circuit, the second input end is connected with the valve position signal of the boiler fuel oil return regulation valve, and the output is connected with the tracking quantity point TP of the HSVMAN hand controller.
[0020] The boiler fuel oil supply pressure monitoring circuit comprises a third selector SEL, a comparison module GT, a comparison module LE, a logic AND and an RS flip-flop, the first input end and the second input end of the third selector are connected with the signal of the boiler fuel oil supply pressure, the third input end is connected with the output end;
[0021] The first input end of the comparison module GT is connected with the output end of the third selector SEL, and the second input end is connected with the signal of the upper limit threshold of the fuel oil supply pressure;
[0022] The first input end of the comparison module LE is connected with the output end of the third selector SEL, the second input end is connected with the signal of the lower limit threshold of the fuel oil supply pressure, and the output end is connected with the reset end I2 of the RS flip-flop;
[0023] The first input end of the logic AND is connected with the interlocking signal of the boiler fuel oil return regulation valve, the second input end is connected with the output end of the comparison module GT, and the output end is connected with the set end I1 of the RS flip-flop;
[0024] The output end of the RS flip-flop DV is connected with the tracking switch TS of the HSVMAN hand controller.
[0025] The start-up circuit comprises the signal of the boiler fuel oil return regulation valve connected with the input end PV of the HSVMAN hand controller and the valve position signal of the boiler fuel oil return regulation valve connected with the input end FB of the HSVMAN hand controller.
[0026] In the embodiment, the upper limit of the fuel oil supply pressure is set to 3.0 MPa, and the lower limit of the fuel oil supply pressure is set to 2.7 MPa.
[0027] When the fuel supply pressure is less than or equal to 2.7 MPa, the first input of the comparison module LE is less than or equal to the second input, the output is 1, the reset end of the RS flip-flop is 1, and the output DV is 0, and the fuel return regulating valve is maintained.
[0028] When the fuel supply pressure continues to increase and is greater than 2.7 MPa but less than 3.3 MPa, the output of the comparison module LE becomes 0, the I2 end of the RS flip-flop is 0, the first input of the comparison module GT is less than the second input, thus the output is 0, the first and second inputs of the logic AND are both 0, the output is 0, the I1 of the RS flip-flop is 0, the DV end is maintained, and the fuel return regulating valve is still maintained.
[0029] When the fuel supply pressure continues to increase and exceeds 3.3 MPa, the output of the comparison module GT becomes 1, the logic AND output becomes 1, the I1 set end of the RS flip-flop HSRS is 1, the I2 reset end is 0, the output DV becomes 1, and the hand controller controls the fuel return regulating valve to increase the valve opening degree by 58% in this embodiment, thereby accelerating the return of oil.
[0030] At this time, the fuel supply pressure begins to decrease, and when the fuel supply pressure decreases to below 3.3 MPa, the output of the comparison module GT becomes 0, the logic AND output is 0, the set end I1 of the RS flip-flop HSRS is 0, the reset end I2 is 0, the DV output end is maintained, and the fuel return regulating valve valve opening degree is still maintained.
[0031] The fuel supply pressure continues to decrease until it is less than or equal to 2.7 MPa, the output of the comparison module LE becomes 1, the reset end I2 of the RS flip-flop HSRS becomes 1, the DV output end is 0, and the hand controller controls the fuel return regulating valve to recover.
[0032] In addition, the logic AND and RS flip-flop can also be directly controlled by setting the boiler fuel return regulating valve interlock signal to 1 to regulate the return of oil.
[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. An interlocked boiler fuel oil system for preventing overpressure, characterized in that The boiler fuel oil return adjustment circuit is connected with the tracking point TP of the HSVMAN hand controller, and the boiler fuel oil supply pressure monitoring circuit is connected with the tracking switch TS of the HSVMAN hand controller.
2. An interlocked boiler fuel system for preventing overpressure according to claim 1, wherein The boiler fuel oil return adjustment circuit comprises a first selector SEL, an adder ADD and a second selector SEL connected in sequence, and is connected with a boiler fuel oil pressure high connection open fuel oil return adjustment valve signal, a boiler fuel oil return adjustment valve valve position signal and a boiler fuel oil return adjustment valve valve position signal at an input end and connected with the tracking point TP of the HSVMAN hand controller at an output end.
3. An interlocked boiler fuel system for preventing overpressure according to claim 2, wherein The first input end of the first selector SEL is connected with the boiler fuel oil pressure high connection open fuel oil return adjustment valve signal, the second input end is connected with the boiler fuel oil return adjustment valve valve position signal, the third input end and the output end are connected with the first path input of the adder ADD; the other path input of the adder ADD is connected with a fuel oil return adjustment valve valve position opening degree signal, and the output is connected with the third input end of the second selector SEL; the first input end of the second selector SEL is connected with the boiler fuel oil supply pressure monitoring circuit, the second input end is connected with the boiler fuel oil return adjustment valve valve position signal, and the output is connected with the tracking point TP of the HSVMAN hand controller.
4. The interlocked boiler fuel system for preventing overpressure according to claim 1, wherein The boiler fuel oil supply pressure monitoring circuit comprises a third selector SEL, a comparison module GT, a comparison module LE, a logic AND and an RS flip-flop, is connected with a boiler fuel oil supply pressure signal and a boiler fuel oil return adjustment valve interlocking signal at an input end, and is connected with the tracking switch TS of the HSVMAN hand controller at an output end.
5. An interlocked boiler fuel system for preventing overpressure according to claim 4, wherein The first input end and the second input end of the third selector SEL are connected with the boiler fuel oil supply pressure signal, and the third input end is connected with the output end; The first input end of the comparison module GT is connected with the output end of the third selector SEL, and the second input end is connected with a fuel oil supply pressure upper limit threshold signal; The first input end of the comparison module LE is connected with the output end of the third selector SEL, the second input end is connected with a fuel oil supply pressure lower limit threshold signal, and the output end is connected with a reset end I2 of the RS flip-flop; The first input end of the logic AND is connected with the boiler fuel oil return adjustment valve interlocking signal, the second input end is connected with the output end of the comparison module GT, and the output end is connected with a set end I1 of the RS flip-flop; The output end of the RS flip-flop DV is connected with the tracking switch TS of the HSVMAN hand controller.
6. The interlocked boiler fuel system for preventing overpressure according to claim 1, wherein The start-up circuit comprises a boiler fuel oil return adjustment valve signal connected with the input end PV of the HSVMAN hand controller and a boiler fuel oil return adjustment valve valve position signal connected with the input end FB of the HSVMAN hand controller.