CN203810381U - Reheat steam temperature control system and thermal power unit equipment - Google Patents
Reheat steam temperature control system and thermal power unit equipment Download PDFInfo
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- CN203810381U CN203810381U CN201420215175.XU CN201420215175U CN203810381U CN 203810381 U CN203810381 U CN 203810381U CN 201420215175 U CN201420215175 U CN 201420215175U CN 203810381 U CN203810381 U CN 203810381U
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Abstract
The utility model discloses a reheat steam temperature control system and thermal power unit equipment. The reheat steam temperature control system is formed by connecting a first function module, a first addition module, an addition and subtraction module, a first regulation module, a third addition module, a small selection module and a first operation module in sequence. The input end of the first addition module is further connected with the output end of a first constant value module. The input end of the third addition module is further connected with the output end of a second function module. The output end of the addition and subtraction module is further connected with a second addition module, a second regulation module, a fourth addition module and a second operation module in sequence. The input end of the second addition module is further connected with the output end of a second constant value module. The input end of the fourth addition module is further connected with the output end of a fourth function module. By the adoption of the single-loop PI regulation mode, with priority given to regulation of the swing angle of a burner port, with desuperheating water spraying being a supplement, reheat steam temperature can be regulated by changing the tilt angle of the burner port, the safe operation of a unit is guaranteed, and the heat economy of the unit is improved.
Description
Technical field
The utility model relates to power station automation control field, particularly a kind of Reheated-steam Temperature Control System and fired power generating unit equipment.
Background technology
In modernization thermal power plant is controlled automatically, reheat steam temperature affects safety and stability and the economic benefit of fired power generating unit, and therefore the control for resuperheat unit, reheat steam temperature is a very important controlling unit.The general method of reheat steam temperature that regulates has: regulate reheater or superheater baffle plate, by changing the flue gas flow of reheater, change reheat steam temperature degree; Or in case of emergency, by adjusting, spray water rapidly temperature is regulated down.
At present in order to improve the thermal efficiency of generating set, boiler turbine group more than high pressure all adopts resuperheat system, correspondingly in boiler set up again hot heating surface, make the steam that steam turbine high-pressure cylinder is discharged again be heated as the reheated steam with uniform temperature, send back to steam turbine in, in low pressure (LP) cylinder, continue the acting of expanding.Reheat steam temperature is to have the controlled device of delaying, have inertia, self-balancing.But because the pressure of reheated steam is low, flow is little, heat transfer coefficient is little, so the variable effect that reheat steam temperature is loaded is larger.When unit load reduces by 30%, if reheat steam temperature is not controlled, boiler reheater outlet steam temperature will reduce by 28～35 ℃.Therefore,, under identical thermal deviation condition, the outlet Temperature Deviation that reheat steam temperature causes is larger than superheated steam.In addition, reheater inlet steam temperature changes along with steam turbine high-pressure cylinder exhaust temperature, and the amplitude of variation of reheat steam temperature is much bigger compared with overheating steam temperature.
As can be seen here, keep reheat steam temperature stable just necessary adjusted, but the outlet Temperature Deviation of existing fired power generating unit reheater is larger, if reheat steam temperature is regulated, adjustment process need to expend the labour intensity that unit staff is very large, the mode that cannot answer by letter is adjusted, more follows the example of the stability that guarantees reheat steam temperature, thereby reduces the economic benefit of fired power generating unit.
Utility model content
(1) technical problem that will solve
The technical problems to be solved in the utility model is how reheat steam temperature to be controlled, to guarantee the stability of reheat steam temperature.
(2) technical scheme
For solving the problems of the technologies described above, the utility model provides a kind of Reheated-steam Temperature Control System, comprise the first function module, the first addition module, plus-minus module, the first adjustment module, the 3rd addition module, little modeling piece and the first operational module that connect successively, the input of the first addition module is also connected with the output of the first definite value module, and the input of the 3rd addition module is also connected with the output of the second function module;
The output of plus-minus module also connects the second addition module, the second adjustment module, the 4th addition module and the second operational module successively, the input of the second addition module is also connected with the output of the second definite value module, and the input of the 4th addition module is also connected with the output of the 4th function module.
Further, also comprise the 3rd function module, the input of the 3rd function module is all connected with the first function module, the second function module and the 4th function module, and the output of the 3rd function module is connected with the input of little modeling piece.
Further, described the first function module, the second function module, the 3rd function module and the 4th function module input are all inputted main steam flow.
Further, the input of described plus-minus module is also inputted reheater outlet steam temperature.
Further, the output of described the first operational module is connected with swing nozzles controller, and the output of described the second operational module is connected with desuperheating water controller.
Further, described the first definite value module and the second customized module provide reheat steam temperature setting value to the first addition module and the second addition module respectively, so that main steam flow is revised.
For solving the problems of the technologies described above, this use is novel also provides a kind of fired power generating unit equipment, comprises boiler and the Reheated-steam Temperature Control System that boiler temperature is controlled, and described Reheated-steam Temperature Control System is above-described Reheated-steam Temperature Control System.
(3) beneficial effect
A kind of Reheated-steam Temperature Control System that the utility model embodiment provides, adopt single loop PI regulative mode, the nozzles pendulum angle of take is adjusted to master, spray desuperheating water as auxiliary, is adjusted to master under normal circumstances to swing nozzles, and the regulated variable signal that swings nozzles adjuster is reheater outlet steam temperature.By changing the angle of inclination of burner, change the position of flame kernel and the flue-gas temperature of furnace outlet, make corresponding the changing of heat absorption ratio of each heating surface, reach the object that regulates reheat steam temperature degree.By changing nozzles inclination angle, can regulate reheat steam temperature, guarantee the safe operation of unit, improve the heat-economy of unit.Simultaneously this use is novel also provides a kind of fired power generating unit equipment based on above-mentioned Reheated-steam Temperature Control System.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of a kind of Reheated-steam Temperature Control System of providing in the utility model embodiment mono-.
The specific embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present utility model is described in further detail.Following examples are used for illustrating the utility model, but are not used for limiting scope of the present utility model.
Embodiment mono-
The utility model provides a kind of Reheated-steam Temperature Control System, its electrical block diagram as shown in Figure 1, comprise the first function module f1 (x), the first addition module ∑ 1, plus-minus module J, the first adjustment module PI, the 3rd addition module ∑ 3, little modeling piece V and the first operational module Z/S1 that connect successively, the input of the first addition module ∑ 1 is also connected with the output of the first definite value module G1, and the input of the 3rd addition module ∑ 3 is also connected with the output of the second function module f2 (x).
The output of plus-minus module J also connects the second addition module ∑ 2, the second adjustment module PID, the 4th addition module ∑ 4 and the second operational module Z/S2 successively, the input of the second addition module ∑ 2 is also connected with the output of the second definite value module G2, and the input of the 4th addition module ∑ 4 is also connected with the output of the 4th function module f4 (x).
Further, in said system, also comprise the 3rd function module f3 (x), the input of the 3rd function module f3 (x) is all connected with the first function module f1 (x), the second function module f2 (x) and the 4th function module f4 (x), and the output of the 3rd function module f3 (x) is connected with the input of little modeling piece V.
Further, the first function module f1 (x) in the present embodiment, the second function module f2 (x), the 3rd function module f3 (x) and the 4th function module f4 (x) input are all inputted main steam flow D.
Further, the input of the plus-minus module J in the present embodiment is also inputted reheater outlet steam temperature T.Preferably, the outlet of the reheater in the present embodiment steam temperature is high temperature section reheater outlet steam temperature.
The reheat steam temperature variation causing in order to suppress load disturbance, system comprises the feedforward compensation loop that main steam flow D is compensated, by two parallel branch, formed, compensation characteristic is determined by the second function module f2 (x) and these two function modules of the 3rd function module f3 (x), wherein send into little modeling piece V Yi road, i.e. the I13 of the output of the 3rd function module f3 (x) output can strengthen regulating action in dynamic process.
Further, in said system, the output of the first operational module Z/S1 is connected with swing nozzles controller BJ, and the output of the second operational module Z/S2 is connected with desuperheating water controller JF.Swing nozzles control end BJ and desuperheating water control end JF and be the control end of adjusting actuator on the spot, by adjusting, swing nozzles and control reheat steam temperature degree, when swinging nozzles and can't control reheat steam temperature degree get back to fixed temperature in adjustable range, desuperheating water actuator will be opened automatically, regulate to surpass to get back to fixed temperature to the reheat steam temperature degree of fixed temperature.
Further, in said system, the first definite value module G1 and the second customized module G2 provide reheat steam temperature setting value O4 and O5 to the first addition module ∑ 1 and the second addition module ∑ 2 respectively, so that main steam flow D is revised.
Above-mentioned Reheated-steam Temperature Control System adopts single loop PI regulative mode, by changing the angle of inclination of spraying burner fire nozzle, change the position of flame kernel and the flue-gas temperature of furnace outlet, make corresponding the changing of heat absorption ratio of each heating surface, reach the object that regulates reheat steam temperature degree.In concrete control procedure, be to swing nozzles to be adjusted to master, and be aided with spray desuperheating and control reheat steam temperature.To swing nozzles, be adjusted to master under normal circumstances, the regulated variable signal that swings nozzles adjuster is reheater outlet steam temperature T.Nozzles regulating system is a single loop PI regulating system, the reheat steam temperature that the first definite value module G1 provides sets value O4 setting value as adjuster after main steam flow D revises, again by plus-minus module J and reheater outlet steam temperature T comparison, its deviate I5 is sent to the first adjustment module, i.e. pi regulator.
For example, when the moment that load increases, feed-forward regulation is moved rapidly, and the output valve of dynamic transient the 3rd function module f3 (x) is less than the output of pi regulator, after little modeling piece V, can make the quick bottom of nozzles, to suppress the rising of reheat steam temperature.After the output of pi regulator reduces, the controlling value that little modeling piece V is transitioned into output pi regulator reposefully regulates nozzles pivot angle, and vice versa, when load reduction, the output valve of the second function module f2 (x) increases, and makes nozzles upper pendulum rapidly, to suppress the decline of reheat steam temperature.
The workflow of said system is as follows:
The main steam flow D of boiler accesses the input S1 of the first function module f1 (x), the input S4 of the input S2 of the 4th function module f4 (x), the second function module f2 (x) and the input S5 of the 3rd function module f3 (x); The first function module f1 (x) output signal O3 of boiler accesses the input I1 of the first addition module ∑ 1; The output signal O4 of the first definite value module G1 of boiler accesses the input I2 of the first addition module ∑ 1; The input I15 of the output signal O6 access plus-minus module J of the first addition module ∑ 1 of boiler; The input S3 of the high temperature section reheater outlet steam temperature T access plus-minus module J of boiler; The output O7 of the plus-minus module J of described boiler place unit accesses the input I5 of the first adjustment module PI and the input I4 of the second addition module ∑ 2; The input I8 of output O9 access the 3rd addition module ∑ 3 of the first adjustment module PI of boiler place unit; The output O13 of the 3rd addition module ∑ 3 of boiler accesses the input I10 of little modeling piece V; The output O14 of the little modeling piece V of boiler place unit accesses the input I11 of the first operational module Z/S1; The first operational module O8 of boiler place unit, the output signal of the second addition module ∑ 2;
O14 access swings nozzles control end BJ; The input I12 of output O2 access the 3rd addition module ∑ 3 of the second function module f2 (x) of boiler place unit; The output O1 of the 3rd function module f3 (x) of boiler place unit accesses the input I13 of little modeling piece V; The output signal O5 of the second definite value module G2 of boiler accesses the input I3 of the second addition module ∑ 2; The output O8 of the second addition module ∑ 2 of boiler place unit accesses the input I6 of the second adjustment module PID; The output O10 of the second adjustment module PID of boiler place unit receives the input I7 of the 4th addition module ∑ 4; The output O12 of the 4th addition module ∑ 4 of boiler place unit is connected to the input I9 of the second operational module Z/S2; The output of the second operational module Z/S2 of boiler place unit is connected to desuperheating water control end JF; The output O11 of the 4th function module f4 (x) of boiler place unit is connected to the input I4 of the 4th addition module.
It should be noted that, the Reheated-steam Temperature Control System that the present embodiment provides is a kind of on line optimization system, goes for large-scale coal dust firing dum boiler, and the DCS control system configuration that can produce by different company's designs is realized.
In sum, the Reheated-steam Temperature Control System that the present embodiment provides, has solved the technical problem that fired power generating unit swings nozzles Switching Logic Control of Reheat Steam Temperature, can alleviate unit operation personnel's labour intensity, improves the thermal efficiency of unit and the stability of reheat steam temperature.
Embodiment bis-
For solving the problems of the technologies described above, the utility model also provides a kind of fired power generating unit equipment, comprise boiler and the Reheated-steam Temperature Control System that boiler temperature is controlled, Reheated-steam Temperature Control System is wherein exactly the Reheated-steam Temperature Control System described in above embodiment mono-.
Above embodiment is only for illustrating the utility model; and be not limitation of the utility model; the those of ordinary skill in relevant technologies field; in the situation that not departing from spirit and scope of the present utility model; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present utility model, and scope of patent protection of the present utility model should be defined by the claims.
Claims (7)
1. a Reheated-steam Temperature Control System, it is characterized in that, comprise the first function module, the first addition module, plus-minus module, the first adjustment module, the 3rd addition module, little modeling piece and the first operational module that connect successively, the input of the first addition module is also connected with the output of the first definite value module, and the input of the 3rd addition module is also connected with the output of the second function module;
The output of plus-minus module also connects the second addition module, the second adjustment module, the 4th addition module and the second operational module successively, the input of the second addition module is also connected with the output of the second definite value module, and the input of the 4th addition module is also connected with the output of the 4th function module.
2. Reheated-steam Temperature Control System as claimed in claim 1, it is characterized in that, also comprise the 3rd function module, the input of the 3rd function module is all connected with the first function module, the second function module and the 4th function module, and the output of the 3rd function module is connected with the input of little modeling piece.
3. Reheated-steam Temperature Control System as claimed in claim 2, is characterized in that, described the first function module, the second function module, the 3rd function module and the 4th function module input are all inputted main steam flow.
4. Reheated-steam Temperature Control System as claimed in claim 1, is characterized in that, the input of described plus-minus module is also inputted reheater outlet steam temperature.
5. Reheated-steam Temperature Control System as claimed in claim 1, is characterized in that, the output of described the first operational module and swing nozzles controller, and the output of described the second operational module is connected with desuperheating water controller.
6. Reheated-steam Temperature Control System as claimed in claim 1, is characterized in that, described the first definite value module and the second customized module provide reheat steam temperature setting value to the first addition module and the second addition module respectively, so that main steam flow is revised.
7. a fired power generating unit equipment, comprises boiler and the Reheated-steam Temperature Control System that boiler temperature is controlled, and it is characterized in that, described Reheated-steam Temperature Control System is the Reheated-steam Temperature Control System described in any one in claim 1-6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420215175.XU CN203810381U (en) | 2014-04-29 | 2014-04-29 | Reheat steam temperature control system and thermal power unit equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420215175.XU CN203810381U (en) | 2014-04-29 | 2014-04-29 | Reheat steam temperature control system and thermal power unit equipment |
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| CN203810381U true CN203810381U (en) | 2014-09-03 |
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| CN201420215175.XU Expired - Fee Related CN203810381U (en) | 2014-04-29 | 2014-04-29 | Reheat steam temperature control system and thermal power unit equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105020697A (en) * | 2014-04-29 | 2015-11-04 | 国网山西省电力公司电力科学研究院 | Reheat steam temperature control system and method and thermal power generating unit device |
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- 2014-04-29 CN CN201420215175.XU patent/CN203810381U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105020697A (en) * | 2014-04-29 | 2015-11-04 | 国网山西省电力公司电力科学研究院 | Reheat steam temperature control system and method and thermal power generating unit device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140903 Termination date: 20180429 |