CN103267304B - Burning control system of large-sized thermal power generating unit - Google Patents

Abstract

The invention discloses a combustion control system of a large-scale thermal power unit, which solves the problem that the existing control method of operating personnel manually adjusting the boiler combustion system cannot achieve rapid load response and stable control of the combustion control system of the large-scale unit boiler. Including PID module, addition and subtraction module, general selection module, small selection module, function module, differential module, main fuel controller, fuel oil pressure regulation system, coal feeder, boiler load command, total air volume, total fuel volume, oxygen content in flue gas The real-time on-line optimization circuit is set up to form an independent dynamic tracking and stable control automatic control system, which solves the dynamic tracking of the combustion system of large boilers. Integrating and stabilizing the technical issues of control can improve the boiler's thermal economy index and achieve the purpose of energy saving and emission reduction.

Description

Combustion Control System of Large Thermal Power Units

technical field

The invention relates to an automatic control system of a thermal power plant, in particular to a PID automatic control system of a combustion control system of a large thermal power generating set.

Background technique

With the rapid development of industrial modernization, the proportion of large-scale thermal power units in the power grid is increasing. Due to changes in the power consumption structure, the difference between the peak and the trough of the daily load curve of the power grid has increased. The difference has reached more than 50%, and there is a tendency to continue to increase. Therefore, the unit units of large thermal power units are required to have the ability to participate in peak regulation and frequency regulation of the power grid. Therefore, the boiler combustion control system has become an important part of completing the task of fully coordinated automatic control of large thermal power units. With the increase of the capacity of large-scale thermal power generating units, the boiler load, water supply, main steam temperature, combustion and main steam pressure, etc. are affected by changes and other disturbance factors, the existing operators adopt the control method of manually adjusting the boiler combustion system It has been difficult to meet the demand for power production quality, and cannot meet the requirements of fast load response and stable control, which directly affects the safe and economical operation of the unit.

Contents of the invention

The invention provides a combustion control system of a large-scale thermal power unit, which solves the technical problem that the existing control method of operating personnel manually adjusting the boiler combustion system cannot achieve rapid load response and stable control of the combustion control system of the large-scale unit boiler.

The present invention solves the above problems through the following solutions:

A combustion control system for a large-scale thermal power unit, including a main fuel controller, a fuel oil pressure adjustment system, a coal feeder, an addition and subtraction module, a function module and a proportional differential integral adjustment module, the input terminal C1 of the small selection module is connected to the unit where the boiler is located The total air volume signal V is connected, the input terminal C2 of the small selection module is connected with the boiler load command M _B of the unit where the boiler is located, the output terminal O1 of the small selection module is connected with the input terminal C3 of the first addition and subtraction module, and the first addition and subtraction module’s The input terminal C18 is connected to the boiler total fuel quantity signal B, the output terminal O2 of the first addition and subtraction module is connected to the input terminal C4 of the main fuel controller, and the output terminal O3 of the main fuel controller is connected to the input terminal C5 of the coal feeder A , the output terminal O30 of the coal feeder A is respectively connected to the input terminal E1 of the fourth proportional differential integral regulator and the input terminal D2 of the fifth proportional differential integral regulator, and the input terminal D1 of the fourth proportional differential integral regulator is connected to the boiler The primary air volume signal F1 of the mill A, the input terminal E2 of the fifth proportional differential integral regulator is connected to the boiler A mill output signal U1, the output terminal O4 of the fourth proportional differential integral regulator is connected to the input terminal C10 of the second selection module, The output terminal of the fifth proportional differential integral regulator (PID5) is connected to the grinding pressure control terminal P1 of boiler A, the output terminal O14 of the second selection module is connected to the input terminal C38 of the second function module, and the output terminal of the second function module The terminal O15 is connected to the input terminal C15 of the fifth addition and subtraction module, the output terminal O16 of the fifth addition and subtraction module is connected to the input terminal C16 of the proportional differential adjustment module, and the output terminal O17 of the proportional differential adjustment module is respectively connected to the primary fan inlet guide vane control Terminal A1 is connected to the primary fan inlet guide vane control terminal A2; the input terminal C20 of the first function module is connected to the main steam flow signal D of the unit, and the output terminal O21 of the first function module is connected to the input terminal C21 of the second addition and subtraction module , the input terminal C22 of the second addition and subtraction module is connected with the flue gas oxygen content O ₂ % signal of the boiler, the output terminal O22 of the second addition and subtraction module is connected with the input terminal C25 of the first proportional differential integral adjustment module, the first The output terminal O19 of the proportional differential integral adjustment module is connected to the input terminal C24 of the third addition module, the input terminal C23 of the third addition module is connected to the output terminal O18 of the first general selection module, and the input terminal C19 of the first general selection module is connected to the boiler where the The boiler load command M _B of the unit is connected, the input terminal C17 of the first general selection module is connected with the boiler total fuel quantity signal B, the output terminal O28 of the third adding module is connected with the input terminal C36 of the second proportional differential integral adjustment module, and the second The input terminal C37 of the proportional differential integral adjustment module is connected with the output terminal O20 of the first addition module addition module, the input terminal C26 of the first addition module addition module is connected with the total primary air volume signal V1 of the boiler, and the input of the first addition module addition module Terminal C27 is connected to the total secondary air volume signal V2 of the boiler, and the output terminal O25 of the second proportional differential integral adjustment module PID2 is respectively connected to the control terminal A3 of the inlet guide vane of the blower and the control terminal A4 of the guide vane of the blower inlet. For example, the output terminal O25 of the differential and integral adjustment module PID2 is also connected to the input terminal C33 of the differential module WF, the output terminal O23 of the furnace pressure setting value module is connected to the input terminal C28 of the sixth addition and subtraction module, and the input terminal of the sixth addition and subtraction module The end C29 is connected with the furnace pressure signal PS of the boiler, the output end O27 of the sixth addition and subtraction module is connected with the input end C30 of the third proportional differential integral adjustment module, the output end O24 of the third proportional differential integral adjustment module is connected with the second addition module The input terminal C31 of the second addition module is connected, the input terminal C32 of the second addition module is connected with the output terminal O29 of the differential module, the output terminal O26 of the second addition module is respectively connected with the input terminal C34 of the third addition and subtraction module and the input of the fourth addition and subtraction module The terminal C35 is connected, the subtrahend input terminal of the third addition and subtraction module is connected with an overriding signal X1, the subtrahend input terminal of the fourth addition and subtraction module is connected with another overriding signal X2, and the output terminal of the third addition and subtraction module The inlet guide vane control terminal A5 of the induced draft fan is connected to the above, and the inlet guide vane control terminal A6 of the induced draft fan is connected to the output terminal of the fourth addition and subtraction module.

The output terminal O3 of the main fuel controller is connected to the input terminal C6 of the coal feeder B, and the output terminal O31 of the coal feeder B is respectively connected to the input terminal E3 of the sixth proportional differential integral regulator and the input of the seventh proportional differential integral regulator Terminal D4 is connected, the input terminal D3 of the sixth proportional differential integral regulator is connected with the primary air volume signal F2 of boiler B mill, the input terminal E4 of the seventh proportional differential integral regulator is connected with the output signal U2 of boiler B mill, the sixth proportional differential The output terminal O6 of the integral regulator is connected to the input terminal C11 of the second major selection module, and the output terminal of the seventh proportional differential integral regulator is connected to the milling pressure control terminal P2 of boiler B.

The invention solves the technical problem of dynamic follow-up and stable control of a large-scale boiler combustion control system, can improve the thermal economic index and performance index of the unit, and achieve the purpose of energy saving and emission reduction.

Description of drawings

Fig. 1 is a structural block diagram of the present invention.

Detailed ways

A combustion control system for a large-scale thermal power unit, including a main fuel controller, a fuel oil pressure regulation system, a coal feeder, an addition and subtraction module, a function module, and a proportional-differential-integral adjustment module. The output terminal O3 of the main fuel controller is connected with For the fuel pressure regulating system, the input terminal C1 of the small selection module XX is connected to the total air volume signal V of the unit where the boiler is located, the input terminal C2 of the small selection module XX is connected to the boiler load command M _B of the unit where the boiler is located, and the output of the small selection module XX The terminal O1 is connected to the input terminal C3 of the first addition and subtraction module J1, the input terminal C18 of the first addition and subtraction module J1 is connected to the boiler total fuel quantity signal B, and the output terminal O2 of the first addition and subtraction module J1 is connected to the main fuel controller. The input terminal C4 is connected, the output terminal O3 of the main fuel controller is connected to the input terminal C5 of the coal feeder A, and the output terminal O30 of the coal feeder A is respectively connected to the input terminal E1 of the fourth proportional differential integral regulator PID4 and the fifth proportional The input terminal D2 of the differential-integral regulator PID5 is connected, the input terminal D1 of the fourth proportional differential-integral regulator PID4 is connected to the primary air volume signal F1 of boiler A, and the input terminal E2 of the fifth proportional differential-integral regulator PID5 is connected to boiler A Grinding output signal U1, the output terminal O4 of the fourth proportional differential integral regulator PID4 is connected to the input terminal C10 of the second selection module DX2, the output terminal of the fifth proportional differential integral regulator PID5 is connected to the grinding pressure control terminal P1 of boiler A connection, the output terminal 014 of the second selection module DX2 is connected to the input terminal C38 of the second function module F2 (X), and the output terminal O15 of the second function module F2 (X) is connected to the input terminal C15 of the fifth addition and subtraction module J7 , the output terminal O16 of the fifth addition and subtraction module J7 is connected to the input terminal C16 of the proportional differential adjustment module PI, and the output terminal O17 of the proportional differential adjustment module PI is connected to the primary fan inlet guide vane control terminal A1 and the primary fan inlet guide vane control terminal respectively A2 connection; the input terminal C20 of the first function module F1 (X) is connected to the main steam flow signal D of the unit, the output terminal O21 of the first function module F1 (X) is connected to the input terminal C21 of the second addition and subtraction module J2, The input terminal C22 of the second addition and subtraction module J2 is connected with the flue gas oxygen content O ₂ % signal of the boiler, and the output terminal O22 of the second addition and subtraction module J2 is connected with the input terminal C25 of the first proportional differential integral adjustment module PID1, The output terminal 019 of the first proportional differential integral adjustment module PID1 is connected with the input terminal C24 of the third adding module J8, and the input terminal C23 of the third adding module J8 is connected with the output terminal O18 of the first general election module DX1, and the first general election module DX1 The input terminal C19 of the boiler is connected to the boiler load command M _B of the unit where the boiler is located, the input terminal C17 of the first selection module DX1 is connected to the boiler total fuel quantity signal B, and the output terminal O28 of the third adding module J8 is connected to the second proportional differential integral adjustment The input terminal C36 of the module PID2 is connected, the input terminal C37 of the second proportional differential integral adjustment module PID2 is connected with the output terminal of the first adding module adding module J3 O20 connection, the input terminal C26 of the first adding module adding module J3 is connected with the total primary air volume signal V1 of the boiler, the input terminal C27 of the first adding module adding module J3 is connected with the total secondary air volume signal V2 of the boiler, and the second proportional differential The output terminal O25 of the integral adjustment module PID2 is respectively connected with the control terminal A3 of the inlet guide vane of the blower and the control terminal A4 of the inlet guide vane of the blower, and the output terminal O25 of the second proportional differential integral adjustment module PID2 is also connected with the input terminal C33 of the differential module (WF) connection, the output terminal O23 of the furnace pressure setting value module _P0 is connected to the input terminal C28 of the sixth addition and subtraction module J9, the input terminal C29 of the sixth addition and subtraction module J9 is connected to the furnace pressure signal PS of the boiler, and the sixth addition and subtraction module The output terminal O27 of the module J9 is connected with the input terminal C30 of the third proportional differential integral adjustment module PID3, the output terminal O24 of the third proportional differential integral adjustment module PID3 is connected with the input terminal C31 of the second adding module J4, and the second adding module J4 The input terminal C32 of the input terminal C32 is connected with the output terminal O29 of the differential module WF, the output terminal O26 of the second addition module J4 is respectively connected with the input terminal C34 of the third addition and subtraction module J5 and the input terminal C35 of the fourth addition and subtraction module J6, and the third The subtrahend input of the addition and subtraction module J5 is connected with an overriding signal X1, the subtrahend input of the fourth addition and subtraction module J6 is connected with another overriding signal X2, and the output of the third addition and subtraction module J5 is connected with a The inlet guide vane control terminal A5 of the induced draft fan, and the output terminal A6 of the inlet guide vane of the induced draft fan is connected to the output terminal of the fourth addition and subtraction module J6.

The output terminal O3 of the main fuel controller is connected to the input terminal C6 of the coal feeder B, and the output terminal O31 of the coal feeder B is respectively connected to the input terminal E3 of the sixth proportional differential integral regulator PID6 and the seventh proportional differential integral regulator PID7 The input terminal D4 of the sixth proportional differential integral regulator PID6 is connected to the input terminal D3 of the boiler B mill primary air volume signal F2, and the input terminal E4 of the seventh proportional differential integral regulator PID7 is connected to the boiler B mill output signal U2. The output terminal O6 of the sixth proportional differential integral regulator PID6 is connected to the input terminal C11 of the second selection module DX2, and the output terminal of the seventh proportional differential integral regulator PID7 is connected to the milling pressure control terminal P2 of boiler B.

The output terminal O3 of the main fuel controller is connected to the input terminal C7 of the coal feeder C, and the output terminal O32 of the coal feeder C is respectively connected to the input terminal E5 of the eighth proportional differential integral regulator PID8 and the ninth proportional differential integral regulator PID9 The input terminal D6 of the eighth proportional differential integral regulator PID8 is connected to the input terminal D5 of the boiler C mill primary air volume signal F3, and the input terminal E6 of the ninth proportional differential integral regulator PID9 is connected to the boiler C mill output signal U3. The output terminal O8 of the eighth proportional differential integral regulator PID8 is connected to the input terminal C12 of the second selection module DX2, and the output terminal of the ninth proportional differential integral regulator PID9 is connected to the boiler C grinding pressure control terminal P3.

The output terminal O3 of the main fuel controller is connected to the input terminal C8 of the coal feeder D, and the output terminal O33 of the coal feeder D is respectively connected to the input terminal E7 of the tenth proportional differential integral regulator PID10 and the eleventh proportional differential integral regulator The input terminal D8 of PID11 is connected, the input terminal D7 of the tenth proportional differential integral regulator PID10 is connected with the primary air volume signal F4 of the boiler D mill, and the input terminal E8 of the eleventh proportional differential integral regulator PID11 is connected with the output signal of the boiler D mill U4, the output terminal 10 of the tenth proportional differential integral regulator PID10 is connected to the input terminal C13 of the second selection module DX2, and the output terminal of the eleventh proportional differential integral regulator PID11 is connected to the boiler D milling pressure control terminal P4.

The output terminal O3 of the main fuel controller is connected to the input terminal C6 of the coal feeder E, and the output terminal O34 of the coal feeder E is respectively connected to the input terminal E9 of the twelfth proportional differential integral regulator PID12 and the thirteenth proportional differential integral regulator The input terminal D10 of the controller PID13 is connected, the input terminal D9 of the twelfth proportional differential integral regulator PID12 is connected to the primary air volume signal F5 of the boiler E mill, and the input terminal E10 of the thirteenth proportional differential integral regulator PID13 is connected to the boiler E mill The output signal U5, the output terminal O12 of the twelfth proportional differential integral regulator PID12 is connected to the input terminal C14 of the second selection module DX2, the output terminal of the thirteenth proportional differential integral regulator PID13 is connected to the boiler E grinding pressure control terminal P5 connection.

Claims (1)

1. the combustion control system of a Large-scale fire-electricity unit, comprise fuel master controller, fuel pressure regulating system, feeder, plus-minus module, function module and proportional integral derivative adjustment module, the output O3 of fuel master controller is connected with fuel pressure regulating system, it is characterized in that, the input C1 of little modeling block (XX) is connected with the total blast volume signal V of boiler place unit, the input C2 of little modeling block (XX) and the boiler load command M of boiler place unit _bconnect, the input C3 that the output O1 and first of little modeling block (XX) adds and subtracts module (J1) is connected, the input C18 of the first plus-minus module (J1) is connected with the total fuel quantity signal B of boiler, the output O2 of the first plus-minus module (J1) is connected with the input C4 of fuel master controller, the output O3 of fuel master controller is connected with the input C5 of feeder A, the output O30 of feeder A is connected with the input E1 of the 4th proportional integral derivative adjuster (PID4) and the input D2 of the 5th proportional integral derivative adjuster (PID5) respectively, the input D1 of the 4th proportional integral derivative adjuster (PID4) is connected with boiler A and grinds primary air flow signal F1, the input E2 of the 5th proportional integral derivative adjuster (PID5) is connected with boiler A and grinds force signal U1, the output O4 of the 4th proportional integral derivative adjuster (PID4) is connected with the input C10 of second largest modeling block (DX2), output and the boiler A of the 5th proportional integral derivative adjuster (PID5) grind grinding pressure control end P1 and are connected, output O14 and the second function module (F2(X) of second largest modeling block (DX2)) input C38 be connected, second function module (F2(X)) output O15 be connected with the input C15 that slender acanthopanax subtracts module (J7), the output O16 that slender acanthopanax subtracts module (J7) is connected with the input C16 of proportion differential adjustment module (PI), the output O17 of proportion differential adjustment module (PI) is connected with primary air fan inlet guide vane control end A1 and primary air fan inlet guide vane control end A2 respectively, first function module (F1(X)) input C20 be connected with the main steam flow signal D of unit, first function module (F1(X)) output O21 and the second input C21 that adds and subtracts module (J2) be connected, the input C22 of the second plus-minus module (J2) is connected with the flue gas oxygen content O of boiler ₂% signal, the output O22 of the second plus-minus module (J2) is connected with the input C25 of the first proportional integral derivative adjustment module (PID1), the output O19 of the first proportional integral derivative adjustment module (PID1) is connected with the input C24 of the 3rd addition module (J8), the input C23 of the 3rd addition module (J8) is connected with the output O18 of first modeling block (DX1), the input C19 of first modeling block (DX1) and the boiler load command M of boiler place unit _bconnect, the input C17 of first modeling block (DX1) is connected with the total fuel quantity signal B of boiler, the output O28 of the 3rd addition module (J8) is connected with the input C36 of the second proportional integral derivative adjustment module (PID2), the input C37 of the second proportional integral derivative adjustment module (PID2) is connected with the output O20 of the first addition module addition module (J3), the input C26 of the first addition module addition module (J3) is connected with total primary air flow signal V1 of boiler, the input C27 of the first addition module addition module (J3) is connected with total secondary air flow signal V2 of boiler, the output O25 of the second proportional integral derivative adjustment module (PID2) is connected with air blower inlet wicket gate control end A3 and air blower inlet wicket gate control end A4 respectively, the output O25 of the second proportional integral derivative adjustment module (PID2) is also connected with the input C33 of differential module (WF), furnace pressure setting value module (P ₀) output O23 and the 6th input C28 that adds and subtracts module (J9) be connected, the input C29 of the 6th plus-minus module (J9) is connected with the furnace pressure signal PS of boiler, the output O27 of the 6th plus-minus module (J9) is connected with the input C30 of the 3rd proportional integral derivative adjustment module (PID3), the output O24 of the 3rd proportional integral derivative adjustment module (PID3) is connected with the input C31 of the second addition module (J4), the input C32 of the second addition module (J4) is connected with the output O29 of differential module (WF), the input C35 that the output O26 of the second addition module (J4) adds and subtracts module (J5) respectively input C34 and the 4th with the 3rd adds and subtracts module (J6) is connected, the subtracting input of the 3rd plus-minus module (J5) is connected with enable override signal X1, the subtracting input of the 4th plus-minus module (J6) is connected with another enable override signal X2, the output of the 3rd plus-minus module (J5) is connected with the inlet guide vane control end A5 of air-introduced machine, the output of the 4th plus-minus module (J6) is connected with the inlet guide vane control end A6 of air-introduced machine.

2. the combustion control system of a kind of Large-scale fire-electricity unit according to claim 1, it is characterized in that, the output O3 of fuel master controller is connected with the input C6 of feeder B, the output O31 of feeder B is connected with the input E3 of the 6th proportional integral derivative adjuster (PID6) and the input D4 of the 7th proportional integral derivative adjuster (PID7) respectively, the input D3 of the 6th proportional integral derivative adjuster (PID6) is connected with boiler B and grinds primary air flow signal F2, the input E4 of the 7th proportional integral derivative adjuster (PID7) is connected with boiler B and grinds force signal U2, the output O6 of the 6th proportional integral derivative adjuster (PID6) is connected with the input C11 of second largest modeling block (DX2), output and the boiler B of the 7th proportional integral derivative adjuster (PID7) grind grinding pressure control end P2 and are connected.