CN214840727U - High-emission to cold readjustment valve open-loop controlled gas-steam combined cycle unit - Google Patents
High-emission to cold readjustment valve open-loop controlled gas-steam combined cycle unit Download PDFInfo
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Abstract
The embodiment of the utility model provides a gas-steam combined cycle unit controlled by a high-emission cold readjusting valve open loop, which adopts an APS system; the open-loop control system comprises a field measuring point, an operation panel and an electric door driving module; the field measuring point is arranged on the high-discharge to cold readjusting door; the electric door driving module receives a hard contact signal of a field measuring point; the output end of the operation panel is electrically connected with the input end of the electric door driving module; the APS system is in communication connection with the electric door driving module through the DCS system; the electric door driving module comprises an OR gate for transmitting the logical sum of the programmed pulse command output from the APS system to the electric door driving module and the pause command output from the operation panel to the electric door driving module; the output end of the electric door driving module is electrically connected with the control end of the high-discharge to cold readjusting door. The utility model discloses fundamentally has avoided the valve position feedback trouble to cause the valve suddenly to open, the suddenly closed condition, reforms transform the back valve reliability and improves by a wide margin.
Description
Technical Field
The utility model relates to a gas-steam combined cycle unit technical field particularly, relates to high row to cold gas-steam combined cycle unit of adjusting a door open loop control again.
Background
The overall configuration of the gas-steam combined cycle two-in-one heat supply unit generally comprises two gas turbines, two gas turbine generators, two waste heat boilers, one heat supply steam turbine and one steam turbine generator. When the steam turbine is a reheating, double-cylinder double-exhaust, backpressure heat supply and condensing steam type steam turbine set, air extraction is not designed, and load adjustment is not involved. The high-pressure main steam generated by the two waste heat boilers passes through respective high-pressure steam-combining electric doors and then is connected through a communicating pipe, and enters a high-pressure section of a high-medium-pressure cylinder of the steam turbine to do work through expansion. The discharged cold reheat steam is divided into two paths and is merged with the medium-pressure fresh steam of the two waste heat boilers through a flow regulating valve respectively and then enters a reheater for reheating, and the flow regulating valve is called as a high-discharge cold reheat valve.
The high-emission to cold readjusting valve is designed as a split type flow adjusting valve, single valve position feedback participates in control, the valve is configured with opening and closing limit and opening and closing torque, and cold readjusting flow to a corresponding boiler is adjusted in an automatic mode. After the valve motor outputs an instruction to the controller by a DCS PO pulse card, the forward and reverse rotation time of the motor is controlled to realize the opening and closing action of the valve. Because the high-emission to cold readjustment valve is designed into a split type single feedback control regulating valve, when the feedback 4-20 mA signal fluctuates due to the reasons of wiring looseness or signal interference and the like, the abnormal opening and closing of the valve can be directly caused. For example, when the normal unit operates with one drive, the operation boiler side high-discharge to cold readjustment gate should be kept fully open in the manual mode (instruction 100%, feedback 100%), and the stop boiler side high-discharge to cold readjustment gate should be kept fully closed in the manual mode (instruction 0%, feedback 0%). At the moment, if the feedback of the high-discharge-to-cold re-adjusting valve of the operating boiler fluctuates to 101% and the quality is not damaged, the valve is directly caused to be continuously closed until the valve is completely closed; if the feedback of the high-discharge to cold re-adjusting valve of the boiler side is stopped to fluctuate to-1% and the quality is not damaged, the valve is directly caused to be continuously opened to be fully opened. Therefore, the accident that the unit is not stopped is caused slightly, and the equipment damage and even the personal injury accident are caused seriously, so that the hidden danger is extremely large. In addition, if the quality of the valve feedback is bad, although the valve can not be suddenly opened or closed, the remote operation of the DCS system can be prevented.
SUMMERY OF THE UTILITY MODEL
The present specification provides a high discharge to cold re-damper open loop controlled gas-steam combined cycle unit to overcome at least one technical problem in the prior art.
According to an embodiment of the present specification, there is provided a gas-steam combined cycle unit for open loop control of a high emission to cold readjustment gate, the gas-steam combined cycle unit including: the system comprises two gas turbines, a steam turbine, a condenser, two waste heat boilers and an open-loop control system; the gas-steam combined cycle unit adopts an APS system; the gas inlet ends of the two waste heat boilers are respectively communicated with one gas turbine, and high-temperature gas discharged by each gas turbine is conveyed into the waste heat boiler communicated with the gas turbine; the steam turbine comprises a low pressure cylinder and a high and medium pressure cylinder, and the steam exhaust end of the medium pressure section of the high and medium pressure cylinder is communicated with the steam inlet end of the low pressure cylinder through a connecting pipeline; the high-pressure section steam exhaust end of the high and medium pressure cylinder is connected with a cold re-steam main conveying pipeline, and two cold re-steam flow distribution pipelines are led out of the cold re-steam main conveying pipeline; a high-discharge to cold re-adjusting door is arranged on the cold re-steam diversion pipeline; the water outlet end of the condenser is connected with a main condensed water conveying pipeline, and two paths of condensed water shunting pipelines are led out of the main condensed water conveying pipeline; the waste heat boiler comprises a waste heat boiler body, a low-pressure steam pocket, a medium-pressure water feeding pump, a medium-pressure steam pocket, a high-pressure water feeding pump, a high-pressure steam pocket and a low-pressure economizer, a low-pressure evaporator, a low-pressure superheater, a medium-pressure economizer, a medium-pressure evaporator, a medium-pressure superheater, a reheater, a high-pressure economizer, a high-pressure evaporator and a high-pressure superheater which are arranged in the waste heat boiler body; wherein,
the two condensed water shunting pipelines are respectively connected with one ends of the low-pressure coal economizer of the two waste heat boilers; the other end of the low-pressure economizer is communicated with the low-pressure steam pocket; two ends of the low-pressure evaporator are respectively communicated with the low-pressure steam pocket; one end of the low-pressure superheater is communicated with the low-pressure steam drum, and the other end of the low-pressure superheater is connected with a low-pressure steam conveying pipeline; a low-pressure steam combining valve is arranged on the low-pressure steam conveying pipeline; the two low-pressure steam conveying pipelines are converged and then are connected to the connecting pipeline together;
one end of the medium-pressure economizer is communicated with the low-pressure steam drum through the medium-pressure water feeding pump, and the other end of the medium-pressure economizer is communicated with the medium-pressure steam drum; two ends of the medium-pressure evaporator are respectively communicated with the medium-pressure steam pocket; one end of the medium-pressure superheater is communicated with the medium-pressure steam drum, and the other end of the medium-pressure superheater is connected with a medium-pressure superheated steam conveying pipeline; a medium-pressure superheater outlet discharge door, a medium-pressure superheater outlet drainage electric door and a medium-pressure superheater outlet electric door are sequentially arranged on the medium-pressure superheated steam conveying pipeline along the medium-pressure superheated steam conveying direction; the medium-pressure superheated steam conveying pipelines of the two waste heat boilers are respectively converged with one cold-reheat steam distribution pipeline and then are jointly connected to one end of the reheater; the other end of the reheater is connected with a medium-pressure reheating steam conveying pipeline; the medium-pressure reheating steam conveying pipeline is provided with a medium-pressure combining valve; the two paths of medium-pressure reheating steam conveying pipelines are converged and then are connected to a medium-pressure section steam inlet end of the high and medium pressure cylinder together;
one end of the high-pressure economizer is communicated with the low-pressure steam drum through the high-pressure water feeding pump, and the other end of the high-pressure economizer is communicated with the high-pressure steam drum; two ends of the high-pressure evaporator are respectively communicated with the high-pressure steam pocket; one end of the high-pressure superheater is communicated with the high-pressure steam drum, and the other end of the high-pressure superheater is connected with a high-pressure steam conveying pipeline; a high-pressure steam combining valve is arranged on the high-pressure steam conveying pipeline; the two paths of high-pressure steam conveying pipelines are converged and then are connected to the steam inlet end of the high-pressure section of the high-intermediate pressure cylinder; the high-pressure steam conveying pipeline of each waste heat boiler is communicated with the cold reheat steam shunt pipeline through a high-pressure bypass, and a high-pressure bypass regulating valve is installed on the high-pressure bypass;
the open-loop control system comprises a field measuring point, an operation panel and an electric door driving module; the field measuring point is arranged on the high-discharge to cold readjusting door; the electric door driving module receives a hard contact signal of the field measuring point; the output end of the operation panel is electrically connected with the input end of the electric door driving module; the APS system is in communication connection with the electric door driving module through a DCS system; the electric door driving module comprises an OR gate for transmitting the logical sum of the programmed pulse command output from the APS system to the electric door driving module and the pause command output from the operation panel to the electric door driving module; the output end of the electric door driving module is electrically connected with the control end of the high-discharge cold readjusting door.
Optionally, the gas-steam combined cycle unit further comprises two gas turbine generators, and the two gas turbine generators are respectively coaxially connected with one gas turbine.
Optionally, the gas-steam combined cycle unit further comprises a steam turbine generator, and the steam turbine generator is coaxially connected with the steam turbine.
Optionally, a low-pressure bypass is led out from the low-pressure steam conveying pipeline, and the low-pressure bypass is communicated with a water inlet end of the condenser; and a low-pressure bypass adjusting valve is installed on the low-pressure bypass.
Optionally, a middle-pressure bypass is led out from the middle-pressure reheating steam conveying pipeline and is communicated with a water inlet end of the condenser; and a medium-pressure bypass adjusting door is installed on the medium-pressure bypass.
Optionally, the medium-pressure economizer comprises a medium-pressure primary economizer and a medium-pressure secondary economizer; one end of the medium-pressure primary economizer is communicated with the low-pressure steam pocket through the medium-pressure water feeding pump, and the other end of the medium-pressure primary economizer is communicated with the medium-pressure secondary economizer; the medium-pressure secondary economizer is communicated with the medium-pressure steam pocket.
Optionally, the reheater comprises a primary reheater and a secondary reheater; the medium-pressure superheated steam conveying pipelines of the two waste heat boilers are respectively converged with one cold-reheat steam distribution pipeline and then are jointly connected to one end of the primary reheater; the other end of the primary reheater is communicated with the secondary reheater; the secondary reheater is connected to the medium-pressure reheat steam delivery line.
Optionally, the high-pressure economizer comprises a high-pressure primary economizer, a high-pressure secondary economizer and a high-pressure tertiary economizer; one end of the high-pressure primary economizer is communicated with the high-pressure steam pocket through the high-pressure water feeding pump, and the other end of the high-pressure primary economizer is communicated with the high-pressure secondary economizer; the high-pressure secondary economizer is communicated with the high-pressure tertiary economizer; the high-pressure three-stage economizer is communicated with the high-pressure steam drum;
the high-pressure superheater comprises a high-pressure primary superheater and a high-pressure secondary superheater; one end of the high-pressure primary superheater is communicated with the high-pressure steam pocket, and the other end of the high-pressure primary superheater is communicated with the high-pressure secondary superheater; the high-pressure secondary superheater is connected with the high-pressure steam conveying pipeline.
Optionally, an air treatment device is arranged at the air inlet end of the compressor of the gas turbine.
Optionally, the low-pressure parallel valve, the medium-pressure parallel valve and the high-pressure parallel valve are all electrically operated valves.
The beneficial effects of the embodiment of the specification are as follows:
the gas-steam combined cycle unit adopts an APS system, adopts a mode of interlocking high water level and high water level without connecting a high pressure steam valve and closing an electric valve at the outlet of the medium pressure superheater, can reduce disturbance of a steam-water system, simultaneously, high pressure steam enters a steam turbine to do work, reduces working medium waste, and only needs to close a valve of the medium pressure steam-water system, thereby greatly reducing the operation load of operators on duty.
Aiming at a split type single-valve-position feedback regulating valve with simple automatic control mode and unusual action, the transformation cost is low by logic change without changing field equipment, the problems that the valve is abnormally opened and closed when a valve-position feedback signal of a high-emission to cold readjusting valve is interfered and fluctuated, and the remote operation cannot be carried out when the feedback quality is bad are solved, the conditions of sudden opening and sudden closing of the valve caused by the valve-position feedback fault are fundamentally avoided, and the reliability of the valve after transformation is greatly improved.
The innovation points of the embodiment of the specification comprise:
1. in the embodiment, the gas-steam combined cycle unit adopts an APS system, adopts a mode that a high-water-level interlock is not connected with a high-pressure steam-combining valve, and closes an electric valve at an outlet of a medium-pressure superheater, disturbance of a steam-water system can be reduced, meanwhile, high-pressure steam enters a steam turbine to do work, waste of working media is reduced, only a valve of the medium-pressure steam-water system needs to be closed, and the operation amount of an operator on duty is greatly reduced.
2. In the embodiment, aiming at the split type single-valve-position feedback regulating valve with simple automatic control mode and infrequent action, the field device is not required to be changed through logic change, and the transformation cost is low, so that the split type single-valve-position feedback regulating valve is one of the innovation points of the embodiment of the specification.
3. In the embodiment, the problems that the valve is abnormally opened and closed when a valve position feedback signal of the high-emission to cold readjusting valve is interfered and fluctuated, and the remote operation cannot be carried out when the bad quality is fed back are solved, the conditions of sudden opening and sudden closing of the valve caused by the valve position feedback fault are fundamentally avoided, the reliability of the valve after transformation is greatly improved, and the cold readjusting valve is one of innovation points of the embodiment of the specification.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a gas-steam combined cycle unit with a high discharge to cold readjustment valve controlled in an open loop manner according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of control logic for a prior art high drain to cold reconditioning gate provided by an embodiment of the present specification;
FIG. 3 is a schematic diagram illustrating a control logic of a high discharge to cold recirculation gate in a gas-steam combined cycle plant controlled by an open loop of the high discharge to cold recirculation gate according to an embodiment of the present disclosure;
in the figure, 1 is a gas turbine, 2 is a condenser, 3 is a waste heat boiler body, 4 is a low pressure cylinder, 5 is a high and medium pressure cylinder, 6 is a connecting pipeline, 7 is a cold and re-steam main conveying pipeline, 8 is a cold and re-steam shunt pipeline, 9 is a high discharge to cold re-regulating valve, 10 is a condensation water main conveying pipeline, 11 is a condensation water shunt pipeline, 12 is a low pressure steam pocket, 13 is a medium pressure water feed pump, 14 is a medium pressure steam pocket, 15 is a high pressure water feed pump, 16 is a high pressure steam pocket, 17 is a medium pressure primary economizer, 18 is a medium pressure secondary economizer, 19 is a primary reheater, 20 is a secondary reheater, 21 is a high pressure primary economizer, 22 is a high pressure secondary economizer, 23 is a high pressure tertiary economizer, 24 is a high pressure primary superheater, 25 is a high pressure secondary superheater, 26 is a low pressure economizer, 27 is a low pressure evaporator, 28 is a low pressure superheater, 29 is a medium pressure evaporator, 29 is a high pressure evaporator, 30 is a medium pressure superheater, 31 is a high pressure evaporator, 32 is a low pressure steam delivery pipeline, 33 is a low pressure steam combining valve, 34 is a medium pressure superheated steam delivery pipeline, 35 is a medium pressure superheater outlet discharge door, 36 is a medium pressure superheater outlet drain electric door, 37 is a medium pressure superheater outlet electric door, 38 is a medium pressure reheat steam delivery pipeline, 39 is a medium pressure combining valve, 40 is a high pressure steam delivery pipeline, 41 is a high pressure combining valve, 42 is a high pressure bypass, 43 is a high pressure bypass regulating valve, 44 is an operation panel, 45 is an electric door driving module, 46 is an air treatment device, 47 is a gas turbine generator, 48 is a steam turbine generator, 49 is a low pressure bypass, 50 is a low pressure bypass regulating valve, 51 is a medium pressure bypass, and 52 is a medium pressure bypass regulating valve.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.
It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present specification and the drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The embodiment of the specification discloses a high-emission cold readjustment valve open-loop controlled gas-steam combined cycle unit. The following are detailed below.
In the embodiment of the present specification, the APS system refers to an Automatic plant start-up and shutdown system (APS) of a unit; the DCS System refers to a Distributed Control System (DCS).
FIG. 1 is a block diagram illustrating a combined gas-steam cycle plant with open-loop control of a high discharge to cold re-damper, provided in accordance with an embodiment of the present description. As shown in fig. 1, the gas-steam combined cycle plant includes: the system comprises two gas turbines 1, a steam turbine, a condenser 2, two waste heat boilers and an open-loop control system; the gas-steam combined cycle unit adopts an APS system; the air inlet ends of the two waste heat boilers are respectively communicated with a gas turbine 1, and high-temperature gas discharged by each gas turbine 1 is conveyed into the waste heat boilers communicated with the gas turbines; an air treatment device 46 is arranged at the air inlet end of the compressor of the gas turbine 1, and the air entering the compressor of the gas turbine 1 is treated through the air treatment device 46 so as to improve the efficiency of the gas turbine; the steam turbine comprises a low-pressure cylinder 4 and a high-intermediate-pressure cylinder 5, wherein the steam exhaust end of the intermediate-pressure section of the high-intermediate-pressure cylinder 5 is communicated with the steam inlet end of the low-pressure cylinder 4 through a connecting pipeline 6; the high-pressure section steam exhaust end of the high and medium pressure cylinder 5 is connected with a cold re-steam main conveying pipeline 7, and two cold re-steam shunt pipelines 8 are led out from the cold re-steam main conveying pipeline 7; a high discharge to cold readjustment door 9 is arranged on the cold readjustment steam flow distribution pipeline 8; the water outlet end of the condenser 2 is connected with a main condensed water conveying pipeline 10, and two paths of condensed water diversion pipelines 11 are led out from the main condensed water conveying pipeline 10.
Wherein, the two condensed water shunt pipelines 11 are respectively connected with one end of the low-pressure economizer 26 of the two waste heat boilers; the other end of the low-pressure economizer 26 is communicated with the low-pressure steam drum 12; two ends of the low-pressure evaporator 27 are respectively communicated with the low-pressure steam drum 12; one end of the low-pressure superheater 28 is communicated with the low-pressure steam drum 12, and the other end of the low-pressure superheater is connected with a low-pressure steam conveying pipeline 32; a low-pressure steam delivery pipe 32 is provided with a low-pressure steam combining valve 33, which is preferably an electric valve; the two low-pressure steam delivery pipelines 32 are converged and then are jointly connected to the connecting pipeline 6. Furthermore, a low-pressure bypass 49 is led out from the low-pressure steam conveying pipeline 32, the low-pressure bypass 49 is communicated with the water inlet end of the condenser 2, a low-pressure bypass adjusting valve 50 is installed on the low-pressure bypass 49, steam or condensed water in the low-pressure steam conveying pipeline 32 is conveyed to the condenser 2 through the low-pressure bypass 49, and the low-pressure bypass adjusting valve 50 is used for controlling dredging and interrupting of the low-pressure bypass 49.
Condensed water in the condenser 2 is sequentially conveyed into a low-pressure economizer 26 through a main condensed water conveying pipeline 10 and a condensed water dividing pipeline 11, is preheated by the low-pressure economizer 26 and then is input into a low-pressure steam drum 12, a low-pressure evaporator 27 is connected to the lower surface of the low-pressure steam drum 12, and the water is heated into saturated steam in the low-pressure evaporator 27 and rises to the low-pressure steam drum 12. The saturated steam is output from the low-pressure steam drum 12 and then heated by the low-pressure superheater 28 to generate low-pressure superheated steam which is used for driving the low-pressure cylinder 4 of the steam turbine to do work in a rotating manner. Wherein, the low-pressure superheated steam is discharged to the condenser 2 through the low-pressure bypass 49 before entering the low-pressure cylinder 4 of the steam turbine.
One end of the medium-pressure economizer is communicated with a low-pressure steam drum 12 through a medium-pressure water feeding pump 13, and the other end of the medium-pressure economizer is communicated with a medium-pressure steam drum 14; two ends of the medium-pressure evaporator 29 are respectively communicated with the medium-pressure steam drum 14; one end of the medium-pressure superheater 30 is communicated with the medium-pressure steam drum 14, and the other end of the medium-pressure superheater is connected with a medium-pressure superheated steam conveying pipeline 34; a medium-pressure superheater outlet discharge door 35, a medium-pressure superheater outlet drainage electric door 36 and a medium-pressure superheater outlet electric door 37 are sequentially arranged on the medium-pressure superheated steam conveying pipeline 34 along the medium-pressure superheated steam conveying direction; the medium-pressure superheated steam conveying pipelines 34 of the two waste heat boilers are respectively converged with one cold-reheat steam distribution pipeline 8 and then are jointly connected to one end of a reheater; the other end of the reheater is connected with a medium-pressure reheat steam delivery pipe 38; an intermediate pressure reheat steam delivery line 38 is fitted with an intermediate pressure combination valve 39, which is preferably an electrically operated valve; the two medium-pressure reheating steam delivery pipelines 38 are converged and then are connected to the steam inlet end of the medium-pressure section of the high and medium-pressure cylinder 5 together. Furthermore, a middle-pressure bypass 51 is led out from the middle-pressure reheating steam conveying pipeline 38, and the middle-pressure bypass 51 is communicated with the water inlet end of the condenser 2; a medium pressure bypass damper 52 is mounted on the medium pressure bypass 51; the medium-pressure coal economizer comprises a medium-pressure first-stage coal economizer 17 and a medium-pressure second-stage coal economizer 18; one end of the medium-pressure primary economizer 17 is communicated with the low-pressure steam drum 12 through a medium-pressure water feeding pump 13, and the other end of the medium-pressure primary economizer is communicated with a medium-pressure secondary economizer 18; the medium-pressure secondary economizer 18 is communicated with the medium-pressure steam drum 14; the reheater comprises a primary reheater 19 and a secondary reheater 20; the medium-pressure superheated steam conveying pipelines 34 of the two waste heat boilers are respectively converged with one cold-reheat steam distribution pipeline 8 and then are jointly connected to one end of the primary reheater 19; the other end of the primary reheater 19 is communicated with the secondary reheater 20; the secondary reheater 20 is connected to an intermediate pressure reheat steam delivery line 38.
The water from the low pressure steam drum 12 is injected into the medium pressure first-stage coal economizer 17 by the medium pressure water feeding pump 13, is heated in the medium pressure first-stage coal economizer 17, is continuously heated in the medium pressure second-stage coal economizer 18, enters the medium pressure steam drum 14, and is heated in the medium pressure evaporator 29 into saturated steam which rises to the medium pressure steam drum 14. Saturated steam output from the intermediate-pressure steam drum 14 is heated by the intermediate-pressure superheater 30, then is mixed with steam exhausted from the high and intermediate pressure cylinders 5 of the steam turbine, and is heated by the primary reheater 19 and the secondary reheater 20 in sequence to generate intermediate-pressure reheated steam which is used for driving the intermediate-pressure section of the high and intermediate pressure cylinders 5 of the steam turbine to do work in a rotating manner. Wherein, before the medium-pressure reheated steam enters the medium-pressure section of the high and medium-pressure steam turbine 5, the medium-pressure reheated steam is discharged to the condenser 2 through the medium-pressure bypass 51.
One end of the high-pressure economizer is communicated with the low-pressure steam drum 12 through a high-pressure water feeding pump 15, and the other end of the high-pressure economizer is communicated with a high-pressure steam drum 16; two ends of the high-pressure evaporator 31 are respectively communicated with the high-pressure steam drum 16; one end of the high-pressure superheater is communicated with the high-pressure steam drum 16, and the other end of the high-pressure superheater is connected with a high-pressure steam conveying pipeline 40; a high-pressure steam delivery pipe 40 is provided with a high-pressure throttle valve 41, which is preferably an electric valve; the two high-pressure steam conveying pipelines 40 are converged and then are connected to the steam inlet end of the high-pressure section of the high-intermediate pressure cylinder 5; the high-pressure steam conveying pipeline 40 of each waste heat boiler is communicated with the cold re-steam shunt pipeline 8 through a high-pressure bypass 42, and a high-pressure bypass adjusting valve 43 is installed on the high-pressure bypass 42. Further, the high-pressure economizer comprises a high-pressure first-stage economizer 21, a high-pressure second-stage economizer 22 and a high-pressure third-stage economizer 23; one end of the high-pressure primary economizer 21 is communicated with the high-pressure steam pocket 16 through a high-pressure water feeding pump 15, and the other end of the high-pressure primary economizer is communicated with the high-pressure secondary economizer 22; the high-pressure secondary economizer 22 is communicated with the high-pressure tertiary economizer 23; the high-pressure three-stage economizer 23 is communicated with the high-pressure steam drum 16; the high-pressure superheater comprises a high-pressure primary superheater 24 and a high-pressure secondary superheater 25; one end of the high-pressure primary superheater 24 is communicated with the high-pressure steam drum 16, and the other end is communicated with the high-pressure secondary superheater 25; the high-pressure secondary superheater 25 is connected with a high-pressure steam delivery pipe 40.
The water from the low pressure steam drum 12 is injected into the high pressure first-stage economizer 21 by the high pressure water feeding pump 15 to be heated, then is continuously heated by the high pressure second-stage economizer 22 and the high pressure third-stage economizer 23 in sequence, and then enters the high pressure steam drum 16 to be heated into saturated steam in the high pressure evaporator 31 to rise to the high pressure steam drum 16. The saturated steam output from the high-pressure steam drum 16 is heated by the high-pressure primary superheater 24 and the high-pressure secondary superheater 25 in sequence to generate high-pressure superheated steam which is used for driving the high-pressure end of the high-intermediate pressure cylinder 5 of the steam turbine to rotate and do work. Wherein, the high-pressure superheated steam enters the high-pressure end of the high and medium pressure cylinder 5 of the steam turbine and is discharged to the condenser 2 through the high-pressure bypass 42.
Meanwhile, when the water level of the intermediate pressure steam drum 14 of the waste heat boiler is high and high, the intermediate pressure superheater outlet electric door 37 can be closed in an interlocking manner, the intermediate pressure superheater outlet discharge door 35 and the intermediate pressure superheater outlet drain electric door 36 are opened in a parallel locking manner, the intermediate pressure superheated steam in the intermediate pressure superheated steam conveying pipeline 34 is interrupted by closing the intermediate pressure superheater outlet electric door 37, and the water vapor in the intermediate pressure steam drum 14 is discharged by utilizing the intermediate pressure superheater outlet discharge door 35 and the intermediate pressure superheater outlet drain electric door 36. Meanwhile, delay logic can be added to the alarm logic for the water level high of the intermediate pressure steam drum 14, and in one specific embodiment, when the intermediate pressure superheater outlet electric door 37 of the waste heat boiler needs 45 seconds from full opening to full closing, the delay time is set to be 60 seconds. When the electric door closing limit returns to normal, the medium-pressure steam-water system does not act. When the water level of the intermediate pressure steam pocket 14 of the waste heat boiler is high and alarming, 60 seconds are delayed, and the closing limit of the intermediate pressure superheater outlet electric door 37 is not returned, the intermediate pressure steam-water system is triggered to close the intermediate pressure parallel valve 39 and the high pressure parallel valve 41 in an interlocking manner, the high discharge to cold readjusting valve 9 is closed in an interlocking manner, the intermediate pressure bypass 51 and the high pressure bypass 42 are opened quickly by 50%, the gas turbine 1 is triggered to reduce the load quickly, and the water impact of the steam turbine is prevented. The adopted water level high-high interlocking is not connected with a high-pressure parallel steam valve 41, and the mode of closing the electric valve 37 at the outlet of the medium-pressure superheater can reduce the disturbance of a steam-water system, and simultaneously, high-pressure steam enters the steam turbine to do work, so that the waste of working media is reduced. Because the steam inlet amount of the steam turbine only reduces the middle-pressure superheated steam part and is correspondingly connected with the middle-pressure parallel steam valve 39 and the high-pressure parallel steam valve 41, the steam inlet amount change is small, the work capacity loss of the steam turbine is less, the electric load influence is small, the gas turbine 1 side does not trigger the rapid load reduction, the load of the gas turbine 1 is not influenced, and the practicability is higher.
The unit in the embodiment of the utility model adopts multi-shaft arrangement, the gas-steam combined cycle unit also comprises two gas turbine generators 47 and a steam turbine generator 48, the two gas turbine generators 47 are respectively coaxially connected with a gas turbine 1, and each gas turbine generator 47 is respectively driven by the gas turbine 1 coaxially connected with the gas turbine generator 47 to generate electricity; the steam turbine generator 48 is coaxially connected to the steam turbine and driven by the steam turbine to generate electricity.
In addition, the open loop control system in the embodiment of the present invention includes a field measuring point, an operation panel 44, and an electric door driving module 45; the field measuring point is arranged on the high-discharge to cold readjusting door 9; the electric door driving module 45 receives a hard contact signal of a field measuring point; the output end of the operation panel 44 is electrically connected with the input end of the electric door driving module 45; the APS system is in communication connection with the electric door driving module 45 through a DCS system; the power gate drive module 45 includes an or gate for transmitting the logical sum of the programmed pulse command output from the APS system to the power gate drive module 45 and the pause command output from the operation panel 44 to the power gate drive module 45; the output end of the electric door driving module 45 is electrically connected with the control end of the high-discharge to cold readjusting door 9.
When the gas-steam combined cycle two-in-one heating unit one-in-one actual operation is carried out, the boiler side high discharge to cold readjustment door 9 is operated to be kept fully opened in the manual mode, and the boiler side high discharge to cold readjustment door 9 is stopped to be kept fully closed in the manual mode; when the unit two drives one, because the loads of the two waste heat boilers are basically consistent, the cold readjusting doors 9 corresponding to the high discharge and cold discharge at the two sides are also kept fully opened in a manual mode; only when the vehicle is started or stopped or under some accident conditions, the high-discharge to cold readjusting door 9 needs to be operated by an APS system according to specific conditions or manually opened and closed by an operator on duty, the requirement on the accuracy degree of the operation of the valve is not high, and the deviation within 10 percent can be accepted generally. Therefore, the high-emission to cold readjusting door 9 with the single valve position feedback participating in adjustment is changed into the electric door with the valve position feedback not participating in adjustment through logic, the operation requirement of the unit is met in operation, and under the conditions that field equipment does not need to be changed and low-cost transformation is carried out, the problems that the valve is abnormally opened and closed when the valve position feedback signal is interfered and fluctuated, and the remote operation cannot be carried out when the quality is poor in feedback are solved, the reliability of the transformed valve is higher, and the efficiency of the unit is greatly improved.
As shown in fig. 2, after a high-emission to cold re-valve command in the prior art is sent by the MA station, the command is transmitted to the X3STEP module, compared with the valve position feedback, and an on-off command with different pulse widths is output according to different deviations and is sent to the valve controller via the PO pulse output card, so as to control the valve on-off operation. After the logic change, as shown in fig. 3, the high-discharge to cold readjusting door 9 is used as a conventional electric door for opening and closing control, the original valve position feedback is not involved in the control any more, and is only used as a reference for displaying, and the valve limit and the torque are connected to the DCS system according to the design of the conventional electric door to participate in the valve opening and closing limit logic. Meanwhile, the full travel time of the switch needs to be recorded, and the opening command of the regulating gate in the original APS sequential control logic is converted into the corresponding opening and closing time. For example, when the valve full stroke time is 60s, the original logic APS command requires 20% high exhaust to the cold readjusting gate, and the new logic is turned on for 12s and then turned off.
In summary, the present specification discloses a gas-steam combined cycle unit controlled by a high-discharge-to-cold readjustment valve open loop, which adopts an APS system, and adopts a mode of closing a medium-pressure superheater outlet electric door by using a water level high-high interlock without connecting a high-pressure parallel valve, so that disturbance of a steam-water system can be reduced, and simultaneously, high-pressure steam enters a steam turbine to do work, so that waste of working media is reduced, and only a medium-pressure steam-water system valve needs to be closed, thereby greatly reducing the operation load of an operator on duty.
Aiming at a split type single-valve-position feedback regulating valve with simple automatic control mode and unusual action, the transformation cost is low by logic change without changing field equipment, the problems that the valve is abnormally opened and closed when a valve-position feedback signal of a high-emission to cold readjusting valve is interfered and fluctuated, and the remote operation cannot be carried out when the feedback quality is bad are solved, the conditions of sudden opening and sudden closing of the valve caused by the valve-position feedback fault are fundamentally avoided, and the reliability of the valve after transformation is greatly improved.
Those of ordinary skill in the art will understand that: the figures are schematic representations of one embodiment, and the blocks or processes in the figures are not necessarily required to practice the present invention.
Those of ordinary skill in the art will understand that: modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, or may be located in one or more devices different from the embodiments with corresponding changes. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Claims (10)
1. A high discharge to cold re-damper open loop controlled gas-steam combined cycle unit, said gas-steam combined cycle unit comprising: the system comprises two gas turbines, a steam turbine, a condenser, two waste heat boilers and an open-loop control system; the gas-steam combined cycle unit adopts an APS system; the gas inlet ends of the two waste heat boilers are respectively communicated with one gas turbine, and high-temperature gas discharged by each gas turbine is conveyed into the waste heat boiler communicated with the gas turbine; the steam turbine comprises a low pressure cylinder and a high and medium pressure cylinder, and the steam exhaust end of the medium pressure section of the high and medium pressure cylinder is communicated with the steam inlet end of the low pressure cylinder through a connecting pipeline; the high-pressure section steam exhaust end of the high and medium pressure cylinder is connected with a cold re-steam main conveying pipeline, and two cold re-steam flow distribution pipelines are led out of the cold re-steam main conveying pipeline; a high-discharge to cold re-adjusting door is arranged on the cold re-steam diversion pipeline; the water outlet end of the condenser is connected with a main condensed water conveying pipeline, and two paths of condensed water shunting pipelines are led out of the main condensed water conveying pipeline; the waste heat boiler comprises a waste heat boiler body, a low-pressure steam pocket, a medium-pressure water feeding pump, a medium-pressure steam pocket, a high-pressure water feeding pump, a high-pressure steam pocket and a low-pressure economizer, a low-pressure evaporator, a low-pressure superheater, a medium-pressure economizer, a medium-pressure evaporator, a medium-pressure superheater, a reheater, a high-pressure economizer, a high-pressure evaporator and a high-pressure superheater which are arranged in the waste heat boiler body; wherein,
the two condensed water shunting pipelines are respectively connected with one ends of the low-pressure coal economizer of the two waste heat boilers; the other end of the low-pressure economizer is communicated with the low-pressure steam pocket; two ends of the low-pressure evaporator are respectively communicated with the low-pressure steam pocket; one end of the low-pressure superheater is communicated with the low-pressure steam drum, and the other end of the low-pressure superheater is connected with a low-pressure steam conveying pipeline; a low-pressure steam combining valve is arranged on the low-pressure steam conveying pipeline; the two low-pressure steam conveying pipelines are converged and then are connected to the connecting pipeline together;
one end of the medium-pressure economizer is communicated with the low-pressure steam drum through the medium-pressure water feeding pump, and the other end of the medium-pressure economizer is communicated with the medium-pressure steam drum; two ends of the medium-pressure evaporator are respectively communicated with the medium-pressure steam pocket; one end of the medium-pressure superheater is communicated with the medium-pressure steam drum, and the other end of the medium-pressure superheater is connected with a medium-pressure superheated steam conveying pipeline; a medium-pressure superheater outlet discharge door, a medium-pressure superheater outlet drainage electric door and a medium-pressure superheater outlet electric door are sequentially arranged on the medium-pressure superheated steam conveying pipeline along the medium-pressure superheated steam conveying direction; the medium-pressure superheated steam conveying pipelines of the two waste heat boilers are respectively converged with one cold-reheat steam distribution pipeline and then are jointly connected to one end of the reheater; the other end of the reheater is connected with a medium-pressure reheating steam conveying pipeline; the medium-pressure reheating steam conveying pipeline is provided with a medium-pressure combining valve; the two paths of medium-pressure reheating steam conveying pipelines are converged and then are connected to a medium-pressure section steam inlet end of the high and medium pressure cylinder together;
one end of the high-pressure economizer is communicated with the low-pressure steam drum through the high-pressure water feeding pump, and the other end of the high-pressure economizer is communicated with the high-pressure steam drum; two ends of the high-pressure evaporator are respectively communicated with the high-pressure steam pocket; one end of the high-pressure superheater is communicated with the high-pressure steam drum, and the other end of the high-pressure superheater is connected with a high-pressure steam conveying pipeline; a high-pressure steam combining valve is arranged on the high-pressure steam conveying pipeline; the two paths of high-pressure steam conveying pipelines are converged and then are connected to the steam inlet end of the high-pressure section of the high-intermediate pressure cylinder; the high-pressure steam conveying pipeline of each waste heat boiler is communicated with the cold reheat steam shunt pipeline through a high-pressure bypass, and a high-pressure bypass regulating valve is installed on the high-pressure bypass;
the open-loop control system comprises a field measuring point, an operation panel and an electric door driving module; the field measuring point is arranged on the high-discharge to cold readjusting door; the electric door driving module receives a hard contact signal of the field measuring point; the output end of the operation panel is electrically connected with the input end of the electric door driving module; the APS system is in communication connection with the electric door driving module through a DCS system; the electric door driving module comprises an OR gate for transmitting the logical sum of the programmed pulse command output from the APS system to the electric door driving module and the pause command output from the operation panel to the electric door driving module; the output end of the electric door driving module is electrically connected with the control end of the high-discharge cold readjusting door.
2. The high rejection to cold re-damper open loop controlled gas-steam combined cycle unit of claim 1, further comprising two gas turbine generators, each of said gas turbine generators being coaxially connected to one of said gas turbines.
3. The high rejection to cold re-damper open loop controlled gas-steam combined cycle unit of claim 1, further comprising a steam turbine generator, said steam turbine generator being coaxially connected to said steam turbine.
4. The high-emission cold re-regulating valve open-loop controlled gas-steam combined cycle unit according to claim 1, wherein a low-pressure bypass is led out from the low-pressure steam delivery pipeline, and the low-pressure bypass is communicated with a water inlet end of the condenser; and a low-pressure bypass adjusting valve is installed on the low-pressure bypass.
5. The high-emission cold re-adjusting valve open-loop controlled gas-steam combined cycle unit according to claim 1, wherein a medium-pressure bypass is led out from the medium-pressure re-heating steam conveying pipeline and is communicated with a water inlet end of the condenser; and a medium-pressure bypass adjusting door is installed on the medium-pressure bypass.
6. The high rejection to cold re-damper open loop controlled gas-steam combined cycle unit of claim 1, wherein said medium pressure economizers comprise a medium pressure primary economizer, a medium pressure secondary economizer; one end of the medium-pressure primary economizer is communicated with the low-pressure steam pocket through the medium-pressure water feeding pump, and the other end of the medium-pressure primary economizer is communicated with the medium-pressure secondary economizer; the medium-pressure secondary economizer is communicated with the medium-pressure steam pocket.
7. The high rejection to cold reburn door open loop controlled gas-steam combined cycle plant of claim 1, wherein the reheater comprises a primary reheater, a secondary reheater; the medium-pressure superheated steam conveying pipelines of the two waste heat boilers are respectively converged with one cold-reheat steam distribution pipeline and then are jointly connected to one end of the primary reheater; the other end of the primary reheater is communicated with the secondary reheater; the secondary reheater is connected to the medium-pressure reheat steam delivery line.
8. The high discharge to cold re-damper open-loop controlled gas-steam combined cycle unit of claim 1, wherein the high pressure economizers comprise a high pressure primary economizer, a high pressure secondary economizer, a high pressure tertiary economizer; one end of the high-pressure primary economizer is communicated with the high-pressure steam pocket through the high-pressure water feeding pump, and the other end of the high-pressure primary economizer is communicated with the high-pressure secondary economizer; the high-pressure secondary economizer is communicated with the high-pressure tertiary economizer; the high-pressure three-stage economizer is communicated with the high-pressure steam drum;
the high-pressure superheater comprises a high-pressure primary superheater and a high-pressure secondary superheater; one end of the high-pressure primary superheater is communicated with the high-pressure steam pocket, and the other end of the high-pressure primary superheater is communicated with the high-pressure secondary superheater; the high-pressure secondary superheater is connected with the high-pressure steam conveying pipeline.
9. The high rejection to cold re-damper open loop controlled gas-steam combined cycle unit of claim 1, wherein an air handling unit is provided at an air inlet end of the gas turbine compressor.
10. The high rejection to cold re-damper open loop controlled gas-steam combined cycle unit of claim 1, wherein the low pressure parallel port, the intermediate pressure parallel port, and the high pressure parallel port are all electrically operated valves.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114251139A (en) * | 2021-12-08 | 2022-03-29 | 西安热工研究院有限公司 | Quick start system of adjacent machine of unit system thermal generator set |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114251139A (en) * | 2021-12-08 | 2022-03-29 | 西安热工研究院有限公司 | Quick start system of adjacent machine of unit system thermal generator set |
| CN114251139B (en) * | 2021-12-08 | 2023-09-12 | 西安热工研究院有限公司 | Unit thermal power generation unit neighbor quick start system |
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