CN112856374B - Heat re-extraction steam heating control system and method for coupling pressure matcher - Google Patents
Heat re-extraction steam heating control system and method for coupling pressure matcher Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements or dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B23/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01B23/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
The invention discloses a hot re-extraction and heat supply control system and method for a coupling pressure matcher, wherein the coupling multi-nozzle needle valve controls the pressure matcher, the regulation of the flow and the pressure at an outlet of the pressure matcher is realized by opening a regulating needle valve, a double closed-loop control system consisting of two controllers working in series is selected at the same time, a secondary controller is used for carrying out advanced control on temperature reduction water interference, the influence of the temperature reduction water interference on the outlet steam temperature is reduced, meanwhile, the temperature setting feedforward of driving steam is obtained in advance according to the double closed-loop system, the disturbance influence caused by the change of parameters of the driving steam and the sucked steam due to the change of the working condition of a unit can be weakened, and the control is more accurate. The invention solves the problems that the lag and time constant of the steam temperature at the outlet of the pressure matcher are large, the interference effect of the temperature-reducing water is strong and frequent, the parameter change of the driving/sucking steam caused by the working condition change is difficult to control accurately, and the like.
Description
Technical Field
The invention relates to the field of automatic control of a steam extraction and heat supply system of a thermal power generating unit, in particular to a hot re-extraction and heat supply control system and method of a coupling pressure matcher.
Background
With the rapid development of economy and industry in China, the steam consumption of industrial steam and residents is increased, and the cogeneration of the coal-fired unit is still one of the important ways to meet the current steam load. Meanwhile, with the improvement of power system and the deepening and perfecting of energy-saving and emission-reducing policies in China, power generation enterprises have to ensure safe production and have more urgent requirements on unit operation economy in the competition of market opening and competitive price Internet surfing, so how to effectively reduce heat consumption of cogeneration and realize thermoelectric decoupling is the key research point of the current heat supply technology.
At present, steam in a hot section of a reheater, steam in a cold section of the reheater, steam exhausted by an intermediate pressure cylinder and the like of the steam turbine can be selected as heating steam. The reasonable steam heating mode can be selected to realize the cascade utilization of the steam according to the steam parameter requirements of different users. The industrial steam with higher parameters is taken as a research object, hot re-extraction steam and cold re-extraction steam are mostly selected for supplying heat, and analysis shows that the extraction steam temperature of the hot section is high, on the premise of meeting the same heat supply quantity, the extraction steam quantity is small, and the condensation steam quantity is increased (under the condition of the same steam inlet quantity), so the generating capacity of the unit is increased. The enthalpy value of the hot-section extraction steam consumes a large amount of boiler heat, but the coal burning amount of the boiler is not changed when the evaporation amount is not changed in consideration of the operation mode of the boiler. Therefore, reducing the amount of superheated steam only increases the exhaust gas temperature compared to extracting steam in the cold stage. Therefore, from a thermal economic analysis alone, it is more appropriate to utilize hot-stage extraction rather than cold-stage extraction. Meanwhile, the extraction steam amount of the cold section extraction steam is limited by the overtemperature of the reheater, and the data given by a common boiler plant is about 5% of the evaporation capacity of the boiler. Because the cold section extraction steam volume is limited, the hot section extraction steam is generally adopted when the required steam supply volume is large and the temperature is high.
At present, the conventional steam supply means and control methods mainly comprise the following steps:
1. steam is supplied in a steam extraction and pressure regulation mode of the steam turbine, such as a rotary partition plate, a regulating butterfly valve, a base cylinder valve and the like, the steam pressure is regulated in a valve throttling mode, or the steam pressure is directly reduced to parameters required by a heat user through temperature reduction and pressure reduction of high-pressure steam. The heat supply mode has great throttling effect, which causes throttling loss of non-heat supply steam, and especially when the heat supply accounts for a small share of the total flow, the throttling loss is greater, so that the work capacity of the steam is sacrificed, and a great amount of work capacity of the high-pressure steam is wasted.
2. Heat is supplied through the single-nozzle pressure matcher, high-pressure steam is adopted to suck low-pressure steam, required steam parameters are achieved after mixing, the steam parameters are changed along with the change of the load, the same pressure matcher structure can cause different suction proportions, and the controllable effect is poor. Although the heat utilization efficiency is high, the heat utilization efficiency is greatly influenced by the load change of the unit and steam parameters, the adjustable range is narrow, the flow cannot be adjusted, and the heat utilization efficiency is not suitable for the variable working condition operation of the unit. The adjustable multi-nozzle pressure matcher is a novel pressure matcher developed on the basis of a single nozzle at present, a plurality of ejectors are arranged in the adjustable multi-nozzle pressure matcher, each ejector is provided with an independent braking device, the pressure and the flow of the matcher can be uniformly controlled, and the adjustable multi-nozzle pressure matcher is adjusted in a large steam flow range, so that a favorable means is provided for thermoelectric decoupling adjustment and control of a thermal power plant, but the outlet temperature of the pressure matcher and the opening degree of a needle valve and the amount of desuperheater water are controlled through a traditional PID (proportion integration differentiation), the control effect is general, and the adjustable multi-nozzle pressure matcher has large inertia and time delay.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a heat re-extraction and heat supply control system and a method for a coupling pressure matcher, wherein a multi-nozzle needle valve is adopted to control the outlet pressure and flow of the pressure matcher, so that the steam flow can be automatically controlled in a larger range, and the contradiction that the flow of the pressure matcher cannot be adjusted is solved; the method adopts a cascade control method to control the temperature of the steam at the outlet of the pressure matcher, adopts a double closed-loop control system consisting of two controllers working in series, uses a secondary controller to carry out advanced control on the interference of the desuperheating water, reduces the influence of the interference on the temperature of the steam at the outlet, and solves the problems of large lag and time constant of the temperature at the outlet of the pressure matcher, strong and frequent interference effect of the desuperheating water and difficult control accuracy.
In order to achieve the purpose, the invention adopts the following technical scheme:
a kind of heat of coupling pressure matcher extracts the heating control system of the steam again, the outlet port of heat exchanger couples to high-pressure cylinder 2 entrance of the steam turbine in the boiler 1, the outlet port of the high-pressure cylinder 2 couples to reheater entrance in the boiler 1, the reheater exit in the boiler 1 couples to intermediate governor 5 and heat and extracts the steam check valve 6 again separately, the intermediate governor 5 couples to intermediate pressure cylinder 3, then couple to low-pressure cylinder 4; the hot re-extraction check valve 6 is connected with the hot re-extraction regulating valve 7, the desuperheating water check valve 8 is connected with the desuperheating water regulating valve 9, then the hot re-extraction regulating valve 7 and the desuperheating water regulating valve 9 are connected with the desuperheater 10, then the desuperheater 10 is connected with the driving steam temperature sensor 11, the driving steam pressure sensor 12 and the driving steam flow sensor 13 in turn, the intermediate pressure cylinder 3 is connected with the suction steam regulating valve 14, then the suction steam regulating valve 14 is connected with the suction steam flow sensor 15, the suction steam pressure sensor 16 and the suction steam temperature sensor 17 in turn, then is connected with the suction steam check valve 18, the driving steam flow sensor 13 and the suction steam check valve 18 are connected with the adjustable multi-nozzle pressure matcher 19, then the adjustable multi-nozzle pressure matcher 19 is connected with a steam flow sensor 20 of the steam supply main pipe, a steam pressure sensor 21 of the steam supply main pipe and a steam temperature sensor 22 of the steam supply main pipe in sequence; the actual demand heat supply flow 23 and the steam supply main pipe steam flow sensor 20 on the user side are connected with a pressure matcher needle valve controller 24, and then the pressure matcher needle valve controller 24 is connected with an adjustable multi-nozzle pressure matcher 19; the steam pressure sensor 21 of the steam supply main pipe and the set value 25 of the steam temperature of the steam supply outlet of the unit are connected with a theoretical enthalpy value calculation module 26 of the heat supply main pipe, the suction steam pressure sensor 16 and the suction steam temperature sensor 17 are connected with a suction steam enthalpy value calculation module 27, the drive steam flow sensor 13, the suction steam flow sensor 15 and a current working condition injection coefficient calculation module 28 are connected, then the theoretical enthalpy value calculation module 26 of the heat supply main pipe, the suction steam enthalpy value calculation module 27 and the current working condition injection coefficient calculation module 28 are connected with a drive steam theoretical enthalpy value calculation module 29, the drive steam pressure sensor 12 and the drive steam theoretical enthalpy value calculation module 29 are connected with a drive steam theoretical temperature calculation module 30, the drive steam temperature sensor 11 and the drive steam theoretical temperature calculation module 30 are connected with a temperature reducing water regulating valve lead controller 31, the set value 25 of the steam temperature of the steam supply outlet of the unit and the steam temperature sensor 22 of the steam temperature of the steam supply main pipe are connected with a main control lead controller 31 of the temperature reducing water regulating valve The controller 32 is connected, the driving steam temperature sensor 11 and the desuperheating water regulating valve main controller 32 are connected with the desuperheating water regulating valve sub-controller 33, and then the desuperheating water regulating valve lead controller 31 and the desuperheating water regulating valve sub-controller 33 are connected with the desuperheating water regulating valve 9.
A plurality of ejectors are arranged in the adjustable multi-nozzle pressure matcher 19, each ejector is provided with an independent braking device, and pressure and flow can be uniformly controlled to be adjusted within a large steam flow range.
And the pressure matcher needle valve controller 24, the desuperheating water regulating valve lead controller 31, the desuperheating water regulating valve main controller 32 and the desuperheating water regulating valve sub-controller 33 all adopt PID controllers.
The control method of the hot re-extraction and heat supply control system of the coupling pressure matcher comprises the following steps: the boiler 1 transfers heat to boiler feed water through an internal heat exchanger thereof, so that the boiler feed water is changed into high-temperature high-pressure steam, then the high-pressure cylinder 2 is driven to do work and generate electricity, the exhaust steam of the high-pressure cylinder 2 enters a reheater in the boiler 1 to exchange heat, and then the high-temperature steam drives the intermediate pressure cylinder 3 and the low-pressure cylinder 4 through the intermediate regulating door 5 to do work and generate electricity; leading out partial high-temperature steam in front of the middle regulating valve 5 and behind a reheater of the boiler 1, sending the partial high-temperature steam into a desuperheater 10 through a hot re-steam extraction check valve 6 and a hot re-steam extraction regulating valve 7, regulating the temperature of driving steam entering an adjustable multi-nozzle pressure matcher 19 through desuperheater water sprayed by a desuperheater water regulating valve 9 so as to drive low-temperature steam extraction of the intermediate pressure cylinder 3, and entering the adjustable multi-nozzle pressure matcher 19 through a suction steam regulating valve 14 and a suction steam check valve 18 to be mixed until required steam parameters are supplied to a user for use;
sending the actual steam flow of the steam supply main pipe and the actual heat supply flow 23 required by a user side, which are measured by the steam flow sensor 20 of the steam supply main pipe, into a needle valve controller 24 of the pressure matcher to calculate and generate a needle valve control instruction, so that the opening of the adjustable multi-nozzle pressure matcher 19 is controlled to meet the requirements of outlet flow and pressure; the steam pressure of the main pipe measured by the steam pressure sensor 21 of the steam supply main pipe and the set value 25 of the temperature of the steam supply outlet of the unit are sent to a theoretical enthalpy value calculation module 26 of the heat supply main pipe to calculate and obtain the theoretical enthalpy value of the heat supply main pipe; the suction steam pressure measured by the suction steam pressure sensor 16 and the suction steam temperature measured by the suction steam temperature sensor 17 are sent to a suction steam enthalpy value calculation module 27 to calculate and obtain a suction steam enthalpy value; the steam flow measured by the driving steam flow sensor 13 and the suction steam flow sensor 15 is sent to a current working condition injection coefficient calculation module 28 to be calculated to obtain an injection coefficient, then the results calculated by the heat supply main pipe theoretical enthalpy value calculation module 26, the suction steam enthalpy value calculation module 27 and the current working condition injection coefficient calculation module 28 are sent to a driving steam theoretical enthalpy value calculation module 29 to be calculated in an energy balance manner to obtain a driving steam theoretical enthalpy value, then the calculated driving steam theoretical enthalpy value and the driving steam pressure measured by the driving steam pressure sensor 12 are sent to a driving steam theoretical temperature calculation module 30 to be calculated to obtain a driving steam theoretical temperature, and then the steam temperature measured by the driving steam temperature sensor 11 and the driving steam theoretical temperature are simultaneously sent to a temperature-reducing water regulating valve lead controller 31 to obtain a temperature-reducing water regulating valve instruction I; on the other hand, the steam temperature of the steam supply main pipe measured by the set steam supply outlet temperature set value 25 and the steam temperature sensor 22 of the steam supply main pipe is sent to the main controller 32 of the temperature-reducing water regulating valve, and then the calculation result and the driving steam temperature measured by the driving steam temperature sensor 11 are sent to the auxiliary controller 33 of the temperature-reducing water regulating valve together to be calculated to obtain a second instruction of the temperature-reducing water regulating valve; and the first order of the desuperheating water regulating valve and the second order of the desuperheating water regulating valve are superposed to control the opening degree of the desuperheating water regulating valve 9, so that the accurate control of the temperature of the steam supply outlet of the pressure matcher is realized.
The following discusses the disadvantages of the prior art and the advantages of the technical solution of the present invention:
(1) at present, a temperature and pressure reducing valve is mostly adopted for heat supply control of a heat supply unit, the control method mostly aims at adjusting the pressure of a heat supply outlet, and the accurate control of flow cannot be realized. The heat supply pipeline is long, the inertia is large, and the change of the heat supply pressure has large hysteresis so as to control the heat supply flow to meet the requirement of a heat user, and the heat supply flow is relatively extensive; meanwhile, temperature and pressure reduction will inevitably cause a large throttling effect, and a large amount of high-temperature steam energy is wasted.
(2) Heat is supplied through the single-nozzle pressure matcher, high-pressure steam is adopted to suck low-pressure steam, and the low-pressure steam is mixed to reach required steam parameters, so that throttling loss of high-temperature steam is avoided. However, as the load of the unit changes, the steam extraction parameters change, and the same pressure matcher structure causes different suction proportions, so that the controllable effect is poor. Although the heat utilization efficiency is high, the heat utilization efficiency is greatly influenced by the load change of the unit and steam parameters, the adjustable range is narrow, the flow cannot be adjusted, and the heat utilization efficiency is not suitable for the variable working condition operation of the unit.
(3) The control system and the control method are controlled based on the adjustable multi-nozzle pressure matcher, a plurality of ejectors are arranged in the control system, each ejector is provided with an independent brake device, the pressure and the flow of the matcher can be uniformly controlled, and the adjustment is carried out in a large steam flow range, so that a favorable means is provided for thermoelectric decoupling adjustment control of a thermal power plant, but a conventional PID single-loop control method is adopted at present, the temperature and the pressure of an outlet of the pressure matcher are directly controlled by controlling the opening of a needle valve and the temperature reduction water quantity of a desuperheater, the control effect is general, and the control effect is large in inertia and time delay.
(4) The steam temperature control system adopts the opening of the regulating valve to realize the regulation of the flow and the pressure of the outlet of the pressure matcher, simultaneously selects a cascade control system to regulate the steam temperature of the pressure matcher, forms an auxiliary controller loop by introducing a variable which drives the steam temperature and directly reacts on the disturbance of the desuperheating water to finish the coarse regulation control of the steam temperature of the outlet, simultaneously finishes the fine regulation of the steam temperature of the outlet by using a main controller loop, finishes the control effect which is difficult to achieve by a common single-loop control system through the matching control of the two loops, and weakens the disturbance influence of the desuperheating water on the steam temperature of the outlet; in addition, under the variable load working condition of the unit, the parameters of the driving steam and the sucked steam change in real time, and after the parameters are mixed by the pressure matcher, the temperature of the outlet steam is reflected to have certain lag.
Drawings
Fig. 1 is a schematic connection diagram of a heat re-extraction and heat supply control system of the coupling pressure matcher.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, in the heat re-extraction and heat supply control system of the coupling pressure matcher, an outlet of a heat exchanger in a boiler 1 is connected with an inlet of a high-pressure cylinder 2 of a steam turbine, an outlet of the high-pressure cylinder 2 is connected with an inlet of a reheater in the boiler 1, an outlet of the reheater in the boiler 1 is respectively connected with a middle adjusting door 5 and a heat re-extraction check valve 6, the middle adjusting door 5 is connected with a middle pressure cylinder 3 and then connected with a low-pressure cylinder 4; the hot re-steam extraction check valve 6 is connected with the hot re-steam extraction regulating valve 7, the desuperheating water check valve 8 is connected with the desuperheating water regulating valve 9, then the hot re-steam extraction regulating valve 7 and the desuperheating water regulating valve 9 are connected with the desuperheater 10, then the desuperheater 10 is sequentially connected with the driving steam temperature sensor 11, the driving steam pressure sensor 12 and the driving steam flow sensor 13, the intermediate pressure cylinder 3 is connected with the suction steam regulating valve 14, then the suction steam regulating valve 14 is sequentially connected with the suction steam flow sensor 15, the suction steam pressure sensor 16 and the suction steam temperature sensor 17, and then is connected with the suction steam check valve 18, the driving steam flow sensor 13 and the suction steam check valve 18 are connected with the adjustable multi-nozzle pressure matcher 19, then the adjustable multi-nozzle pressure matcher 19 is connected with a steam flow sensor 20 of the steam supply main pipe, a steam pressure sensor 21 of the steam supply main pipe and a steam temperature sensor 22 of the steam supply main pipe in sequence; the actual demand heat supply flow 23 and the steam supply main pipe steam flow sensor 20 on the user side are connected with a pressure matcher needle valve controller 24, and then the pressure matcher needle valve controller 24 is connected with an adjustable multi-nozzle pressure matcher 19; the steam pressure sensor 21 of the steam supply main pipe and the set value 25 of the steam temperature of the steam supply outlet of the unit are connected with a theoretical enthalpy value calculation module 26 of the heat supply main pipe, the suction steam pressure sensor 16 and the suction steam temperature sensor 17 are connected with a suction steam enthalpy value calculation module 27, the drive steam flow sensor 13, the suction steam flow sensor 15 and a current working condition injection coefficient calculation module 28 are connected, then the theoretical enthalpy value calculation module 26 of the heat supply main pipe, the suction steam enthalpy value calculation module 27 and the current working condition injection coefficient calculation module 28 are connected with a drive steam theoretical enthalpy value calculation module 29, the drive steam pressure sensor 12 and the drive steam theoretical enthalpy value calculation module 29 are connected with a drive steam theoretical temperature calculation module 30, the drive steam temperature sensor 11 and the drive steam theoretical temperature calculation module 30 are connected with a temperature reducing water regulating valve lead controller 31, the set value 25 of the steam temperature of the steam supply outlet of the unit and the steam temperature sensor 22 of the steam temperature of the steam supply main pipe are connected with a main control lead controller 31 of the temperature reducing water regulating valve The controller 32 is connected, the driving steam temperature sensor 11 and the desuperheating water regulating valve main controller 32 are connected with the desuperheating water regulating valve sub-controller 33, and then the desuperheating water regulating valve lead controller 31 and the desuperheating water regulating valve sub-controller 33 are connected with the desuperheating water regulating valve 9.
As a preferred embodiment of the present invention, a plurality of injectors are arranged in the adjustable multi-nozzle pressure adapter 19, each injector has an independent braking device, and the pressure and flow can be uniformly controlled and adjusted within a large steam flow range.
In a preferred embodiment of the present invention, PID controllers are used as the pressure matcher needle valve controller 24, the temperature-reducing water regulating valve lead controller 31, the temperature-reducing water regulating valve main controller 32, and the temperature-reducing water regulating valve sub-controller 33. The PID controller rationale is as follows:
wherein, P (t) is a control instruction output by the controller; k is the set parameter gain; e (t) is the deviation between the actual input value of the controller and the theoretical set value of the controller module at the time t; t isiRepresenting integration time, TdRepresenting the differential time.
As a preferred embodiment of the present invention, the injection coefficient calculation module 28 may calculate the injection coefficient of the pressure matcher by driving the actual steam flow measured by the steam flow sensor 13 and the suction steam flow sensor 15. The calculation formula is as follows:
μ＝GH/GP
wherein: gHIs the suction steam flow; gPTo drive steam flow.
As a preferred embodiment of the present invention, the theoretical enthalpy calculation module 26, the suction steam enthalpy calculation module 27, the driving steam theoretical enthalpy calculation module 29, and the driving steam theoretical temperature calculation module 30 are solved by using a water and steam thermodynamic property calculation formula, so as to obtain a steam enthalpy value and a temperature value. The calculation formula is as follows:
wherein: p, T and h are respectively pressure, temperature and enthalpy, p*、T*、h*Is a constant value, ni、Ii、Ji、ni1、Ji1、ni2、Ii2、Ji2Is a set of constants, R is the gas constant.
As shown in fig. 1, the control method of the heat re-extraction and heat supply control system coupled with the pressure matcher, provided by the invention, comprises the following steps: the boiler 1 transfers heat to boiler feed water through an internal heat exchanger thereof, so that the boiler feed water is changed into high-temperature high-pressure steam, then the high-pressure cylinder 2 is driven to do work and generate electricity, the exhaust steam of the high-pressure cylinder 2 enters a reheater in the boiler 1 to exchange heat, and then the high-temperature steam drives the intermediate pressure cylinder 3 and the low-pressure cylinder 4 through the intermediate regulating door 5 to do work and generate electricity; leading out partial high-temperature steam in front of the intermediate regulating valve 5 and behind a reheater of the boiler 1, sending the partial high-temperature steam into a desuperheater 10 through a hot re-steam extraction check valve 6 and a hot re-steam extraction regulating valve 7, regulating the temperature of driving steam entering an adjustable multi-nozzle pressure matcher 19 through desuperheating water sprayed by a desuperheating water regulating valve 9, so as to drive low-temperature steam extraction of the intermediate pressure cylinder 3, and entering the adjustable multi-nozzle pressure matcher 19 through a suction steam regulating valve 14 and a suction steam check valve 18 to be mixed until required steam parameters are supplied to a user for use;
sending the actual steam flow of the steam supply main pipe measured by the steam flow sensor 20 and the actual heat supply flow 23 required by a user side into a needle valve controller 24 of the pressure matcher to calculate and generate a needle valve control instruction, so as to control the opening of the adjustable multi-nozzle pressure matcher 19 to meet the requirements on outlet flow and pressure; the steam pressure of the main pipe measured by the steam pressure sensor 21 of the steam supply main pipe and the set value 25 of the temperature of the steam supply outlet of the unit are sent to a theoretical enthalpy value calculation module 26 of the heat supply main pipe to calculate and obtain the theoretical enthalpy value of the heat supply main pipe; the suction steam pressure measured by the suction steam pressure sensor 16 and the suction steam temperature measured by the suction steam temperature sensor 17 are sent to a suction steam enthalpy value calculation module 27 to calculate and obtain a suction steam enthalpy value; the steam flow measured by the driving steam flow sensor 13 and the suction steam flow sensor 15 is sent to a current working condition injection coefficient calculation module 28 to be calculated to obtain an injection coefficient, then the results calculated by the heat supply main pipe theoretical enthalpy value calculation module 26, the suction steam enthalpy value calculation module 27 and the current working condition injection coefficient calculation module 28 are sent to a driving steam theoretical enthalpy value calculation module 29 to be calculated in an energy balance manner to obtain a driving steam theoretical enthalpy value, then the calculated driving steam theoretical enthalpy value and the driving steam pressure measured by the driving steam pressure sensor 12 are sent to a driving steam theoretical temperature calculation module 30 to be calculated to obtain a driving steam theoretical temperature, and then the steam temperature measured by the driving steam temperature sensor 11 and the driving steam theoretical temperature are simultaneously sent to a temperature-reducing water regulating valve lead controller 31 to obtain a temperature-reducing water regulating valve instruction I; on the other hand, the steam temperature of the steam supply main pipe measured by the set steam supply outlet temperature set value 25 and the steam temperature sensor 22 of the steam supply main pipe is sent to the main controller 32 of the temperature-reducing water regulating valve, and then the calculation result and the driving steam temperature measured by the driving steam temperature sensor 11 are sent to the auxiliary controller 33 of the temperature-reducing water regulating valve together to be calculated to obtain a second instruction of the temperature-reducing water regulating valve; and the first order of the temperature-reducing water regulating valve and the second order of the temperature-reducing water regulating valve are superposed to control the opening degree of the temperature-reducing water regulating valve 9, so that the accurate control of the temperature of the steam supply outlet of the pressure matcher is realized.
Claims (4)
1. The utility model provides a hot steam extraction heating control system again of coupling pressure matcher which characterized in that: the system comprises a boiler (1), wherein an outlet of a heat exchanger in the boiler (1) is connected with an inlet of a high-pressure cylinder (2) of a steam turbine, an outlet of the high-pressure cylinder (2) is connected with an inlet of an inner reheater in the boiler (1), an outlet of the inner reheater in the boiler (1) is respectively connected with a middle adjusting door (5) and a hot re-extraction check valve (6), the middle adjusting door (5) is connected with a middle pressure cylinder (3), and then is connected with a low pressure cylinder (4); the hot re-extraction check valve (6) is connected with the hot re-extraction regulating valve (7), the desuperheating water check valve (8) is connected with the desuperheating water regulating valve (9), then the hot re-extraction regulating valve (7) and the desuperheating water regulating valve (9) are connected with the desuperheater (10), then the desuperheater (10) is sequentially connected with the driving steam temperature sensor (11), the driving steam pressure sensor (12) and the driving steam flow sensor (13), the intermediate pressure cylinder (3) is connected with the suction steam regulating valve (14), then the suction steam regulating valve (14) is sequentially connected with the suction steam flow sensor (15), the suction steam pressure sensor (16) and the suction steam temperature sensor (17) and then is connected with the suction steam check valve (18), the driving steam flow sensor (13) and the suction steam check valve (18) are connected with the adjustable multi-nozzle pressure matcher (19), then the adjustable multi-nozzle pressure matcher (19) is sequentially connected with a steam flow sensor (20) of a steam supply main pipe, a steam pressure sensor (21) of the steam supply main pipe and a steam temperature sensor (22) of the steam supply main pipe; a user side actual demand heat supply flow (23) and a steam supply main pipe steam flow sensor (20) are connected with a pressure matcher needle valve controller (24), and then the pressure matcher needle valve controller (24) is connected with an adjustable multi-nozzle pressure matcher (19); a steam pressure sensor (21) of a steam supply main pipe and a set value (25) of a steam supply outlet temperature of a unit are connected with a theoretical enthalpy value calculation module (26) of the steam supply main pipe, an inhalation steam pressure sensor (16) and an inhalation steam temperature sensor (17) are connected with an inhalation steam enthalpy value calculation module (27), a driving steam flow sensor (13), an inhalation steam flow sensor (15) and a current working condition injection coefficient calculation module (28) are connected, then the theoretical enthalpy value calculation module (26) of the steam supply main pipe, the inhalation steam enthalpy value calculation module (27) and the current working condition injection coefficient calculation module (28) are connected with a driving steam theoretical enthalpy value calculation module (29), the driving steam pressure sensor (12) and the driving steam theoretical enthalpy value calculation module (29) are connected with a driving steam theoretical temperature calculation module (30), the driving steam temperature sensor (11) and the driving steam theoretical temperature calculation module (30) are connected with a temperature-reducing valve advance water controller (31 and advance water controller (31) ) And the set steam supply outlet temperature set value (25) and the steam supply main pipe steam temperature sensor (22) are connected with the desuperheating water regulating valve main controller (32), the drive steam temperature sensor (11) and the desuperheating water regulating valve main controller (32) are connected with the desuperheating water regulating valve auxiliary controller (33), and then the desuperheating water regulating valve advanced controller (31) and the desuperheating water regulating valve auxiliary controller (33) are connected with the desuperheating water regulating valve (9).
2. The system for controlling heat re-extraction and heat supply coupled with the pressure matcher as claimed in claim 1, wherein: a plurality of ejectors are arranged in the adjustable multi-nozzle pressure matcher (19), each ejector is provided with an independent braking device, and pressure and flow can be uniformly controlled to be adjusted within a large steam flow range.
3. The heat re-extraction and heat supply control system coupled with the pressure matcher as claimed in claim 1, wherein: and the pressure matcher needle valve controller (24), the desuperheating water regulating valve lead controller (31), the desuperheating water regulating valve main controller (32) and the desuperheating water regulating valve auxiliary controller (33) adopt PID controllers.
4. The method for controlling a heat re-extraction and heat supply control system coupled with a pressure matcher as claimed in any one of claims 1 to 3, wherein: the boiler (1) transfers heat to boiler feed water through an internal heat exchanger thereof, so that the boiler feed water is changed into high-temperature high-pressure steam, then a high-pressure cylinder (2) is driven to do work and generate electricity, the exhaust steam of the high-pressure cylinder (2) enters a reheater in the boiler (1) to exchange heat, and then the high-temperature steam drives a middle-pressure cylinder (3) and a low-pressure cylinder (4) through a middle adjusting door (5) to do work and generate electricity; leading out partial high-temperature steam in front of the middle adjusting door (5) and behind a reheater of the boiler (1), sending the partial high-temperature steam into the desuperheater (10) through a hot re-steam extraction check valve (6) and a hot re-steam extraction regulating valve (7), regulating the driving steam temperature entering the adjustable multi-nozzle pressure matcher (19) through desuperheating water sprayed by the desuperheating water regulating valve (9), so as to drive the low-temperature steam extraction of the middle pressure cylinder (3), and entering the adjustable multi-nozzle pressure matcher (19) through a suction steam regulating valve (14) and a suction steam check valve (18) to be mixed to required steam parameters for heat supply users to use;
sending the actual steam flow of the steam supply main pipe and the actual heat supply flow (23) required by a user side, which are measured by the steam flow sensor (20) of the steam supply main pipe, into a needle valve controller (24) of the pressure matcher to calculate and generate a needle valve control instruction, so that the opening degree of the adjustable multi-nozzle pressure matcher (19) is controlled to meet the requirements of outlet flow and pressure; the steam pressure of a main pipe measured by a steam pressure sensor (21) of a steam supply main pipe and a set value (25) of the temperature of a steam supply outlet of a unit are sent to a theoretical enthalpy value calculation module (26) of the heat supply main pipe to calculate and obtain the theoretical enthalpy value of the heat supply main pipe; sending the suction steam pressure measured by the suction steam pressure sensor (16) and the suction steam temperature measured by the suction steam temperature sensor (17) into a suction steam enthalpy value calculation module (27) for calculation to obtain a suction steam enthalpy value; the steam flow measured by the driving steam flow sensor (13) and the suction steam flow sensor (15) is sent to a current working condition injection coefficient calculation module (28) for calculation to obtain an injection coefficient, then, the results calculated by a heat supply main pipe theoretical enthalpy value calculation module (26), an intake steam enthalpy value calculation module (27) and a current working condition injection coefficient calculation module (28) are sent to a driving steam theoretical enthalpy value calculation module (29) for energy balance calculation to obtain a driving steam theoretical enthalpy value, then the calculated driving steam theoretical enthalpy value and driving steam pressure measured by a driving steam pressure sensor (12) are sent to a driving steam theoretical temperature calculation module (30) for calculation to obtain a driving steam theoretical temperature, and then the steam temperature measured by a driving steam temperature sensor (11) and the driving theoretical temperature are simultaneously sent to a desuperheating water regulating valve advanced controller (31) to obtain a desuperheating water regulating valve instruction I; on the other hand, the steam temperature of the steam supply main pipe measured by the set steam supply outlet temperature set value (25) and the steam temperature sensor (22) of the steam supply main pipe is sent to the main controller (32) of the temperature-reducing water regulating valve, and then the calculation result and the driving steam temperature measured by the driving steam temperature sensor (11) are sent to the auxiliary controller (33) of the temperature-reducing water regulating valve together to be calculated to obtain a second instruction of the temperature-reducing water regulating valve; and the first order of the temperature-reducing water regulating valve and the second order of the temperature-reducing water regulating valve are superposed to control the opening degree of the temperature-reducing water regulating valve (9), so that the accurate control of the temperature of the steam supply outlet of the pressure matcher is realized.
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| CN113489024B (en) * | 2021-07-13 | 2023-05-26 | 西安热工研究院有限公司 | Multi-mode steam extraction auxiliary peak regulation and frequency modulation control system and method for cogeneration unit |
| CN113983441A (en) * | 2021-10-09 | 2022-01-28 | 上海核工程研究设计院有限公司 | Multipurpose coordination control scheme for heat supply reactor |
| CN114060105A (en) * | 2021-10-19 | 2022-02-18 | 国能(福州)热电有限公司 | Cogeneration central heating system and control method thereof |
| CN115341969B (en) * | 2022-07-05 | 2024-06-18 | 华能应城热电有限责任公司 | System and method for improving overall flexibility and economy of cogeneration power plant |
| CN115263468A (en) * | 2022-07-29 | 2022-11-01 | 西安西热锅炉环保工程有限公司 | Control method for wide-load thermoelectric unit heat supply system |
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