CN2091354U - Cooling and pressure-relief device for generating electricity - Google Patents
Cooling and pressure-relief device for generating electricity Download PDFInfo
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- CN2091354U CN2091354U CN 91202964 CN91202964U CN2091354U CN 2091354 U CN2091354 U CN 2091354U CN 91202964 CN91202964 CN 91202964 CN 91202964 U CN91202964 U CN 91202964U CN 2091354 U CN2091354 U CN 2091354U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
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Abstract
The utility model discloses a cooling and pressure-relief device for generating electricity. The cooling and pressure-relief device for generating electricity makes the excess vapour of the moderate temperature moderate pressure boiler of a minitype thermal power plant changed to drive a secondary moderate temperature moderate pressure turbine generator to generate electricity. The cooling and pressure-relief device for generating electricity is composed of a pressure reduction system which is composed of a throttle hole plate, a pressure reduction valve, a stop valve, and a pipeline which are communicated with a Venturi inner pipe, a temperature reduction system which is composed of a voltage stabilization flow reduction hole plate, a temperature reduction water regulation valve, and a check valve which are communicated with a mixer by the spray nozzle of the Venturi inner pipe, and a pipeline which is led to the total vapour valve of a steam turbine, and a temperature and pressure automatic regulation mechanism. The heat energy of the moderate temperature moderate pressure boiler can be sufficiently used by the cooling and pressure-relief device for generating electricity, a power plant boiler is reduced, and standard coal consumption and electricity generating cost are lowered.
Description
The utility model belongs to a kind of reducing-and-cooling plant that utilizes thermoelectricity plant's medium temperature and medium pressure boiler initial steam more than needed to drive time medium temperature and medium pressure (or low-temp low-pressure) steam turbine generator.Being particularly suitable for small-sized thermal power plant uses.
Reducing-and-cooling plant is in Thermal Power Station, common effect is following several respects: 1, the deficiency that is used for replenishing extracted steam from turbine in the external heating system, when overhaul of steam turbine or contingency are stopped using, with the initial steam pressure and temperature reducing of boiler, to guarantee hot user's the vapour of using.Also can do standby vapour source.2, in the bypath system of big capacity reheating turbine group, work as unit starting, shut down or when having an accident, desirable adjusting and protective action.3, the igniting temperature-decreased pressure reducer of installing in the power plant then is a steam discharge when being used for ignition of the boiler, general temperature-decreased pressure reducer will satisfy the minimum steam flow that enters this equipment and be not less than 50% of specified steam throughput, better pressure and temperature reducing effect is just arranged, and the evaporation of can not vaporizing fully in this equipment of 30～35% water spray is arranged, need discharge through STEAM TRAP.
General small-sized thermal power plant, the Turbo-generator Set of existing medium temperature and medium pressure parameter and supporting boiler thereof, Turbo-generator Set and supporting boiler thereof that inferior medium temperature and medium pressure parameter (or low-temp low-pressure parameter) is arranged again, and the thermal efficiency of inferior medium temperature and medium pressure boiler (or low temperature low pressure boiler) be lower than the medium temperature and medium pressure boiler its mark coal consumption be higher than the medium temperature and medium pressure boiler.And the medium temperature and medium pressure boiler often has a considerable amount of unnecessary initial steams can supply to utilize.But, generally after reducing-and-cooling plant is handled, make the purposes of above-mentioned four aspects as preceding described.Therefore, all not strict to the requirement of reducing-and-cooling plant and the requirement of regulating and controlling mechanism thereof, need not consider to enter what and vaporization whether fully of the water yield of mixer yet.If use reducing-and-cooling plant with it as generating, then have the problem of the following aspects: the cooling water supply pipeline is unfavorable for regulation and control; Regulating and controlling mechanism is insensitive; Its measuring cell delay inertia is big, dynamic characteristic is poor, and the steam enthalpy that causes entering superheater changes frequently, and amplitude is big.The controlled plant capacity is little, and the speed of ascending to heaven is fast, when load variations is big, does not satisfy needs.And steam turbine is very strict to the requirement of the pressure and temperature of admission steam, only allows to change in a narrower scope, and especially cooling water control is bad, will cause the vapor (steam) temperature deviation to surpass permitted value, threatens the safety of steam turbine; The vaporization pipeline of cooling water can not make cooling water that sufficient evaporation conditions is arranged with cooperating of mixer.Therefore, vapor pressure is regulated control mechanism no matter existing reducing-and-cooling plant is the decompression back, vapor (steam) temperature regulating and controlling mechanism behind the desuperheat, all incompatible unnecessary initial steam with the medium temperature and medium pressure boiler is directly used in the needs that drive time medium temperature and medium pressure (or low-temp low-pressure) steam turbine power generation.
The cooling water system of prior art divides three the tunnel by a Three way type desuperheat modulating valve to be communicated with respectively is cooling water water source supply pipeline, the unnecessary cooling water pipeline that is discharged into oxygen-eliminating device, the cooling water pipeline that is connected with the cooling water nozzle of Venturi tube, the latter enters Venturi tube and is the mixer of one with it through nozzle, be communicated with by the total steam valve of pipeline and steam turbine from mixer outlet, key issue is that the long neither one to the pipeline length between the steam turbine total air valve and mixer can guarantee that length that cooling water fully carries out heat exchange therein is than relation from mixer outlet.Generally all be lower than below 3 times of mixer length.To the pipeline between the Venturi tube nozzle, a flow measurement orifice plate and a stop valve have been used at the cooling water modulating valve; Adorned a flow measurement orifice plate between total steam valve to steam turbine at mixer outlet, and behind this measuring diaphragm, connected 30～35% the cooling water hydrophobic discharge pipe is arranged and can not vaporize through the STEAM TRAP discharge conduit.Used two stop valves and a voltage stabilizing orifice plate in cooling water water source supply pipeline, got rid of to the oxygen-eliminating device pipeline at superfluous water and used a stop valve, not only its complex structure importantly can not satisfy the requirement of steam turbine to throttle (steam) temperature.
The regulation and control of the pressure and temperature reducing of prior art are connected with the input end of electric controller by cable by pressure transmitter (or temperature transmitter---use in the desuperheat regulating and controlling mechanism).The adjusting pressure usage ratio rule of electric controller, temperature regulation is the proportional integral rule.The output terminal of electric controller connects by the input end of cable with servoamplifier.The output terminal of servoamplifier connects by the input end of cable with electric actuator.The output arm of electric actuator is connected by the transmission levers of pull bar with reduction valve (or cooling water modulating valve---usefulness in the desuperheat regulating and controlling mechanism).The degree of regulation of this regulation and control system is not too high, dynamic quality is not so good, and the cooling water that enters mixer is cooperated appropriately with the ratio that enters the high-temperature steam that mixes mixer; When entering steam flow, can not make cooling water fully vaporization in mixed steam less than 50% nominal output.That is to say, this regulating and controlling mechanism can not promptly and accurately be reacted to decompression desuperheat situation in the mixer on the final controlling element of reduction valve or cooling water modulating valve, make it the aperture of correct adjusting reduction valve or cooling water modulating valve, deacclimatize the needs that vapor pressure and cooling water are supplied with in the mixer.
The purpose of this utility model is exactly existing reducing-and-cooling plant to be repacked into the unnecessary initial steam that the medium temperature and medium pressure boiler produces to be become the device that is adapted to drive time medium temperature and medium pressure (or low-temp low-pressure) steam turbine power generation.And the cooling water that participates in desuperheat is vaporized fully, thereby in small-sized thermal power plant, can save time medium temperature and medium pressure (or low-temp low-pressure) boiler, reach the heat energy that has promptly made full use of power plant, reduce the mark coal and economize consumption, saved station service and the effect that has reduced equipment again.
Solution of the present utility model is as follows:
The reducing-and-cooling plant that is used to generate electricity is with pipeline reduction valve to be communicated with Venturi tube.Attaching restricting orifice between the two is with to continuing the step-down throttling through reduction valve to the steam of Venturi tube.Stop valve of attaching on the pipeline of the steam inlet side of reduction valve, at the stop valve two ends by pipeline and logical in succession heat-riser valve.Stop valve of attaching again in the pipeline of this stop valve female pipe to steam is to strengthen the control to the fresh steam of the female Guan Lai of steam.So just constituted the depressurized system of reducing-and-cooling plant.By the safety valve of adorning on the mixer that is connected as a single entity with Venturi tube; in the cooling water pipeline restriction confluent cooling water voltage stabilizing restriction orifice and the safety protection mechanism that constituted whole reducing-and-cooling plant of the restricting orifice between aforesaid Venturi tube and reduction valve; by the cooling water pipeline of introducing at the nozzle place of Venturi tube and finish Venturi tube, the temperature reducing system that mixer and the pipeline that is communicated with the total steam valve of steam turbine thereof constitute to the effect of steam desuperheat.Pressure and temperature reducing auto-control mechanism in addition, vapor (steam) temperature, pressure samples mechanism for monitoring etc. has constituted the reducing-and-cooling plant that is used to generate electricity, and its main points are:
One, finish the steam desuperheat and make it to reach time medium temperature and medium pressure (or low-temp low-pressure) steam turbine power generation vapour requirement, and make cooling water in mixer and pipeline thereof fully the formation of temperature reducing system of vaporization be to be communicated with the inlet of check valve by the outlet of pipeline with two general formula cooling water modulating valve of conveniently regulating and controlling, by pipeline the outlet of check valve is communicated with nozzle on the Venturi tube again, outlet at the mixer that is connected as a single entity with Venturi tube is communicated with total steam valve of pipeline with steam turbine, and make mixer outlet to the length of the pipeline between the total steam valve of steam turbine three times greater than mixer length, the entry end of cooling water modulating valve is communicated with a stop valve by pipeline, voltage stabilizing restriction orifice of attaching in the pipeline between them, the other end of stop valve turns on the cooling water feed main.
Two, vapor (steam) temperature auto-control mechanism is connected through the input end of compensating wire with the miniature electric potential difference meter of attached electric controller by fast thermocouple behind the desuperheat, the output terminal of the miniature electric potential difference meter of attached electric controller is connected with the input end of servoamplifier through actuating cable, the output terminal of servoamplifier connects through the input end of actuating cable with electric actuator, the output arm of electric actuator is connected by the transmission levers of pull bar with the cooling water modulating valve, input end in electric actuator connects a control switch with actuating cable, in the feedback termination one valve position table formation of electric actuator.
Three, decompression auto-control mechanism is joined through the input end of actuating cable with the miniature electric potential difference meter of attached electric controller by pressure transmitter, the output terminal of the miniature electric potential difference meter of attached electric controller connects the input end of servoamplifier through actuating cable, the output terminal of servoamplifier is connected with the input end of electric actuator by actuating cable, and the output arm of electric actuator connects and composes by the transmission levers of pull bar and reduction valve.
Secondly, at steam turbine steam inlet place a thermal sleeve thermocouple is housed, be connected to the upper and lower limit alarm terminals of the temperature indicator alarm on the instrument panel through compensating wire, again through lead with instrument panel on the flashing signal alarm join, constitute the mechanism for monitoring of secondary steam temperature, to make things convenient for the operator on duty to observe temperature indicated value situation, for its setting value that changes duct thermostat provides foundation.Steam sampling pipeline after pressure and temperature reducing is equipped with in the outlet port of mixer, it is to be communicated with the steam sampling cooler by pipeline by two stop valves to constitute.When preparing against the startup steam turbine, uses by the also logical in succession bypass stop valve in the two ends of the total steam valve of steam turbine.Connect one in the pipeline before the steam inlet of the total steam valve of steam turbine by three stop valves and the drainage channel that STEAM TRAP constitutes.In the depressurized system pipeline, be positioned at outlet port attaching fresh steam pressure, temperature sampling monitoring instrument that the female pipe of steam feeds first stop valve of relief line.In the cooling water pipeline, attaching cooling water temperature, pressure monitoring instrument between cooling water modulating valve and check valve.
Just constituted a complete reducing-and-cooling plant that is used to generate electricity by above-mentioned several decompression, desuperheat and regulation and control thereof, safety protection, fresh steam, secondary steam and cooling water sampling feeler mechanisies that finish difference in functionality.Its method of operation is: the initial steam by the female Guan Lai of main steam is sent into reduction valve behind two stop valves, makes that pressure reduces after the initial steam throttling, specific volume increases, entropy increases, enthalpy is constant, temperature reduces, and enters Venturi tube again.Meanwhile, the cooling water that is come by supply pipe enters the cooling water modulating valve through a stop valve and voltage stabilizing restriction orifice, sprays in the Venturi tube along the nozzle of pipeline on check valve and Venturi tube again.Steam and cooling water are entered carry out heat exchange in the mixer.It is saturated vapour that steam is emitted heat heating cooling water, continues to be heated to be superheated vapor, and by the steam that relief line is sent here, because of the heat release temperature reduces, at mixer outlet, the two mixes, and becomes secondary steam.The time that mixer is interior, water droplet evaporates fully, depend on the flow velocity of steam and quantity, pressure, temperature and the jet size etc. of pressure, temperature and water spray, be lower than under 31.5% low load condition of exerting oneself, because steam flow is little, flow velocity is low, heat exchange between spray vapour and the water spray weakens, and water droplet has little time to evaporate fully in mixer, for this reason, in the configuration of pipeline between total steam valve, make steam line length three times to steam turbine at mixer outlet greater than the length of mixer own.Allow the water droplet that does not evaporate fully in pipeline, proceed heat exchange, make it to be vaporizated into fully superheated vapor.The all satisfactory steam of pressure and temperature enters steam turbine through the total steam valve of steam turbine, drives generator for electricity generation.
Vapor (steam) temperature is regulated working principle automatically and is behind the desuperheat: indicate record from the miniature electric potential difference meter that the vapor (steam) temperature of mixer outlet is directly sent into attached electric controller by fast thermocouple, its pointer and given temperature pointer (being the slide wire resistance dish) are formed the deviation voltage signal-transmitting machine.When deviation being arranged, send into electric controller with the differential pressure signal and amplify when indicated temperature and to fixed temperature.Obtain 0～10 milliampere of direct current output, carry out ratio, integration, differentiate, feed back to amplifier input terminal then and constitute closed loop through feedback loop.Make output become with input signal the current signal of proportional---integration---differential relationship, drive the open degree that electric actuator removes to control the cooling water modulating valve through servoamplifier.Thereby the change injection flow rate has been controlled vapor (steam) temperature in allowed limits.
Decompression back vapor pressure auto-control working principle is: the interior vapor pressure of mixer is sent into pressure transmitter through the Gauge Valves that is loaded on the mixer outlet place and is become the miniature electric potential difference meter indication record that 0～10 milliampere of dc signal is sent into attached electric controller, its pointer and setting value pointer have a differential pressure signal to send into pressure regulator through the deviation sender unit and amplify during if any pressure difference.Obtain 0～10 milliampere of direct current output, carry out ratio, integral operation through feedback loop.Feed back to amplifier in then and constitute closed loop, output is become and be entered as ratio---the current signal of integral relation, go to control the open degree of reduction valve through the servoamplifier actuate actuators, change the steam throughput, thereby reach the control vapor pressure in allowed band.
By the reducing-and-cooling plant that technique scheme is made, can effectively the fresh steam from medium temperature and medium pressure be removed to drive time medium temperature and medium pressure (or low-temp low-pressure) steam turbine power generation behind pressure and temperature reducing.
The utility model has the advantages that: adopted existing pipeline component in whole device, being linked and packed through pipeline forms.Therefore it is implemented easily.Used highly sensitive electronics auto-control device to constitute auto-control mechanism.Make the pressure and temperature reducing regulation and control of device have higher sensitivity and reliability, guaranteed unnecessary initial steam from thermal efficiency height, the low medium temperature and medium pressure boiler of mark coal consumption, behind pressure and temperature reducing, obtain to be suitable for the secondary steam that medium temperature and medium pressure (or low-temp low-pressure) steam turbine power generation uses.Replaced low and mark coal consumption high inferior medium temperature and medium pressure (or low-temp low-pressure) boiler of the original thermal efficiency.Reduced the equipment in thermal power plant.Thereby saved station service, and saved mark consumption of coal amount, improved voltage levvl (many band wattless powers when the band deficiency is meritorious).Reduce cost of electricity-generating, can reduce the operator of boiler part simultaneously, improved work efficiency.
Accompanying drawing 1 is the utility model structural representation.
Accompanying drawing 2 is vapor (steam) temperature auto-control mechanism principle figures behind the utility model desuperheat.
Accompanying drawing 3 is decompression of the present utility model back vapor pressure auto-control mechanism principle figures.
As an embodiment of the present utility model, the utility model is described in further detail below in conjunction with accompanying drawing.
With reference to accompanying drawing 1 and accompanying drawing 3, the utility model is made of decompression, desuperheat and regulating and controlling mechanism separately thereof.Decompression part is communicated with stop valve (2), stop valve (7), reduction valve (8), throttling step-down orifice plate (9) successively with pipeline by the female pipe of steam (1) and forms a pipeline and 10. be connected with Venturi tube, the also logical in succession heat-riser valve (37) at stop valve (7) two ends adds that like this mixer (36) that 10. is connected as one with Venturi tube constitutes.Pressure auto-control mechanism be by being contained in mixer (36) outlet end afterwards pressure transmitter (13) of Gauge Valves (14), the vapor pressure situation of change in the mixer (36) taken out become electric signal.Pressure transmission device (13) is connected to the input end of the miniature electric potential difference meter (45) of attached electric controller with actuating cable, the output terminal of the miniature electric potential difference meter (45) of attached electric controller joins through actuating cable and servoamplifier (44) input end, through actuating cable servoamplifier (44) output terminal is connected on the input end of electric actuator (43) again.The output arm of electric actuator (43) is connected to form by the transmission levers of pull bar and reduction valve (8).Secondly, the fresh steam pressure, the temperature sampling monitoring mechanism that are made of Gauge Valves (5), pressure transducer (4), moving-coil table (3), thermocouple (6) etc. have been installed on exporter's pipeline of stop valve (2), above-mentioned three parts have been finished the decompression of fresh steam, regulation and control and monitoring task.
With reference to accompanying drawing 1 and accompanying drawing 2, temperature reducing system of the present utility model is communicated with through the entry end of pipeline with cooling water modulating valve (30) then by section valve (28), the voltage stabilizing restriction orifice (29) that are communicated with delivery (pipe) line.For conveniently regulating and controlling, cooling water modulating valve (30) adopt two general formulas.Attaching check valve (35) on its outlet end pipeline is secured on the nozzle (11) of Venturi tube (10) by pipeline from check valve (35) outlet end again.Constituted the cooling water water supplying pipe road that is communicated to Venturi tube (10) by delivery (pipe) line.Be communicated with greater than 3 times pipeline of mixer (36) length inlet by a segment length in the outlet port of mixer (36) with the total steam valve of steam turbine (19), at the also logical in succession bypass stop valve (20) in the two ends of the total steam valve of steam turbine (19), use during in order to start.By aforesaid cooling water supply pipeline, mixer (36) and just constituted temperature reducing system to the pipeline between the total steam valve of steam turbine (19) in addition.Vapor (steam) temperature is regulated between the outlet end that control mechanism then is secured to the transmission levers of cooling water modulating valve (30) and mixer (36) behind the desuperheat, promptly a fast thermocouple (15) is installed, is sent thereby vapor (steam) temperature situation of change in the mixer (36) is become electric signal by fast thermocouple (15) in the outlet port of mixer (36).Be connected on the fast thermocouple (15) with the input end of compensating wire the miniature electric potential difference meter (42) of attached electric controller.The input end of the same servoamplifier of output terminal (40) of the miniature electric potential difference meter (42) of attached electric controller connects by actuating cable.The output terminal of servoamplifier (40) is connected to the input end electric actuator (39) of electric actuator (39) through actuating cable output arm is connected by the transmission levers of pull bar with cooling water modulating valve (30), distinguishes a control switch of attaching (41) and a valve position table (38) at the input end and the feedback end of electric actuator (39) with actuating cable.
In exporter's pipeline of cooling water modulating valve (30) attaching by Gauge Valves (31), the cooling water pressure and temp mechanism for monitoring that differential teletransmission pressure gauge (32), moving-coil table (33) and thermocouple (34) constitute.Also attaching has been communicated with the secondary steam sampling monitoring pipeline that is made of stop valve (26), (27) and steam sampling cooler (25) in mixer (36) outlet port.Entry end attaching at the total steam valve of steam turbine (16) is communicated with the drainage mechanism that is made of stop valve (22), (23), drain valve (21), drain valve (24) etc.The steam turbine (17) that the outlet feeding of the total steam valve of steam turbine (19) and steam turbine generator (16) are complementary.A thermal sleeve thermocouple (18) also is equipped with at the steam inlet place at steam turbine (17).Be connected to the upper and lower limit alarm terminals of the temperature indicator alarm on the instrument panel through compensating wire, on lead is connected to flashing signal alarm on the instrument panel, safety valve (12) also be installed again in the outlet port of mixer (36).The protective action that voltage stabilizing restriction orifice (29) in safety valve (12) and the cooling water pipeline and the throttling step-down orifice plate (9) in the relief line play device jointly.
Present embodiment adopts 35 tons of/hour boiling furnaces, and vapor pressure is 3.82MPa, and 450 ℃ of vapor (steam) temperatures are for about 4 tons/hour of the excess steam behind 6000 kilowatts of steam turbine band rated power (two boiler and stove operation unnecessary approximately 8 tons/hour).With reference to accompanying drawing, unnecessary initial steam is drawn from boiler by main steam pipe (1).Enter reduction valve (8) through stop valve (2), (7),, send into Venturi tube (10) after the decompression current limliting again by throttling step-down orifice plate (9).Cooling water by feed main is through stop valve (28) simultaneously, voltage stabilizing restriction orifice (29), enter cooling water modulating valve (30) and obtain Current limited Control, enter nozzle (11) through check valve (35) then, cooling water is sprayed into Venturi tube (10) enter the mixer (36) with the post-decompression steam of sending here from relief line and carry out heat exchange.With the vaporization of the cooling water that sprays into, obtain the secondary steam of pressure and temperature in predetermined range with vapor mixing, enter steam turbine (17) along pipeline through the total steam valve of steam turbine (19) from mixer (36) outlet, drive generator (16) generating.1500 kilowatts of steam turbine rated power in the present embodiment, admission vapor pressure 1.96 ± 0.1MPa, 380 ± 10 ℃ of vapor (steam) temperatures, the by-pass valve of reduction valve is that heating coil was used before heat-riser valve (37) was done start; Stop valve (22), (21) are done to use to the ground ditch water discharge when the start heating coil; Stop valve (23) and drain valve (24) are arranged hydrophobic usefulness when normal operation; Stop valve (27), (26), sample cooler (25), the secondary steam sample behind the pressure and temperature reducing is got in confession, and the chemical examination steam quality is used; When starting, by-pass valve (20) the steam supply turbine of the total steam valve of steam turbine (19) uses.Requiring mixer (36) to steam line length between the total steam valve of steam turbine (19) is more than three times of mixer (36) length.
The monitoring of fresh steam pressure, steam line sampling before being reduced pressure certainly by Gauge Valves (5) is connected to teletransmission pressure gauge (4) through gauge pipe; Its electric signal is connected to moving-coil table (3) on the instrument panel through actuating cable; Be used for remote monitoring fresh steam pressure.Mixer (36) outlet is equipped with Gauge Valves (14) through gauge pipe, gives pressure transmitter (13) with post-decompression vapor pressure sampling.Produce 0～10 milliampere of electric signal output.Deliver to the miniature electric potential difference meter (45) of attached electric controller on the instrument panel through actuating cable, the back vapor pressure is indicated to reducing pressure, record.Its pointer and given pointer (by the resistance slide wire disc) are formed the deviation voltage signal-transmitting machine; When indicated pressure had deviation with prior setting pressure, the differential pressure signal was sent into the interior amplifier of electric controller, obtained 0～10 milliampere of direct current output, carried out ratio through feedback loop, and integral operation feeds back to amplifier in then.Constitute closed loop, output is become and be entered as ratio---the electric signal of integral relation.Drive the open degree that electric actuator (43) changes reduction valve (8) through servoamplifier (44), make vapor pressure in predetermined range.
Temperature regulation is measured by stop valve (2) back dress thermocouple (6), measures the fresh steam temperature through the moving-coil table that compensating wire is connected on the instrument panel.At mixer (36) outlet Zhuan Armor dress thermocouple (15), be connected to the miniature electric potential difference meter (42) of attached electric controller on the instrument panel through compensating wire, the back vapor (steam) temperature is indicated to reducing pressure, record.When its pointer and given temperature pointer have deviation, form the deviation voltage signal-transmitting machine, sending into electric controller fast number with differential pressure amplifies, obtain 0～10 milliampere of direct current output, carry out ratio, integration, differentiate through feedback loop, feed back to amplifier input terminal then and constitute closed loop, make output become with input signal the current signal of proportional---integration---differential relationship, drive the open degree that electric actuator (39) goes to control cooling water modulating valve (30) through servoamplifier (40).Become injection flow rate thereby see, vapor (steam) temperature is controlled within the specified value.In the preceding pipeline of steam turbine (17) thermal sleeve thermocouple (18) is housed, the temperature indicator alarm upper and lower limit that is connected to instrument panel through compensating wire is reported to the police, and its output connects dish and goes up flash alarm.Carry out the vapor (steam) temperature overload alarm, change the foundation of regulator definite value for the operator on duty.On the outer pipe of cooling water modulating valve (30), through the gauge pipe attaching Gauge Valves (31) and differential teletransmission pressure gauge (32).Its output connects moving-coil table (33) on the instrument panel through actuating cable, in order to measure cooling water pressure.On the cooling water pipeline of check valve (35) inlet side, adorn platinum thermoresistance (34), be connected to moving-coil table on the instrument panel, in order to measure the temperature of cooling water through actuating cable.
Said temperature pressure is regulated the control measuring instrument and all is loaded on the special-purpose Thermal Meter dish.
Utilize device described in the utility model, can be effectively with middle temperature, remove to drive time medium temperature and medium pressure (or low-temp low-pressure) steam turbine behind the unnecessary initial steam pressure and temperature reducing that medium-pressure boiler produces and drive generator for electricity generation.Its regulation and control are sensitive reliable, are that small-sized thermal power plant reduces cost, and reduce boiler equipment, the generating device that reduces the mark consumption of coal and make full use of medium temperature and medium pressure boiler heat energy.
Claims (4)
1; a kind of reducing-and-cooling plant that is used to generate electricity; be the same Venturi tube of reduction valve (8) (10) to be communicated with pipeline; a restricting orifice of attaching (9) between the two; a stop valve of attaching (7) on the pipeline of reduction valve (8) steam inlet side; the two ends of stop valve (7) are by pipeline and logical in succession heat-riser valve (37); gone back attaching stop valve (2) between the female pipe of stop valve (7) and steam; constitute depressurized system like this; go up the safety valve of adorning (12) by the mixer (36) that same Venturi tube (10) is connected as a single entity; the safety protection mechanism that the cooling water voltage stabilizing restriction orifice (29) of restriction confluent and the restricting orifice (9) between Venturi tube (10) and the reduction valve (8) constitute in the cooling water pipeline; by cooling water pipeline of locating to introduce at the nozzle (11) of Venturi tube (10) and Venturi tube (10); mixer (36) and the temperature reducing system that constitutes with the pipeline that the total steam valve of steam turbine (19) is communicated with thereof; pressure and temperature reducing regulating and controlling mechanism in addition; vapor (steam) temperature; pressure samples mechanism for monitoring etc.; constituted the reducing-and-cooling plant that is used to generate electricity, it is characterized in that:
A, finish the steam desuperheat and make it to reach time medium temperature and medium pressure (or low-temp low-pressure) steam turbine power generation vapour requirement, and make cooling water in mixer (36) and pipeline thereof fully the formation of temperature reducing system of vaporization be to be communicated with the inlet of check valve (35) by the outlet of pipeline with two general formula cooling water modulating valve (30) of a conveniently regulating and controlling, by pipeline check valve (35) outlet is communicated with nozzle (11) on the Venturi tube (10) again, be communicated with at the outlet of the mixer (36) that is connected as a single entity with Venturi tube (10) total steam valve (19) with the same steam turbine of pipeline (17), and the length that is exported to the pipeline between the total steam valve of steam turbine (19) that makes mixer (36) is greater than three times of mixer (36) length, the entry end of cooling water modulating valve (30) is communicated with stop valve (28) by pipeline, a voltage stabilizing restriction orifice of attaching (29) in the pipeline between them, the other end of stop valve (28) turns on the cooling water feed main
B, vapor (steam) temperature auto-control mechanism is connected through the input end of compensating wire with the miniature electric potential difference meter (42) of attached electric controller by fast thermocouple (15) behind the desuperheat, the output terminal of the miniature electric potential difference meter (42) of attached electric controller is connected through the input end of actuating cable with servoamplifier (40), the output terminal of servoamplifier (40) connects through the input end of the same electric actuator of actuating cable (39), the output arm of electric actuator (39) is connected by the transmission levers of pull bar with cooling water modulating valve (30), input end in electric actuator (39) is connected to control switch (41) with actuating cable, its feedback termination valve position table (38) constitutes
C, decompression auto-control mechanism are connected through the input end of actuating cable with the miniature electric potential difference meter (45) of attached electric controller by pressure transmitter (13), the output terminal of the miniature electric potential difference meter (45) of attached electric controller connects the input end of servoamplifier (44) through actuating cable, the output terminal of servoamplifier (44) is connected by the input end of actuating cable with electric actuator (43), and the output arm of electric actuator (43) connects and composes by the transmission levers of pull bar and reduction valve 8.
2, the reducing-and-cooling plant that is used to generate electricity according to claim 1, it is characterized in that steam turbine (17) steam inlet place is equipped with a thermal sleeve thermocouple (18), be connected to the upper and lower limit alarm terminals of temperature indicator alarm on the instrument panel through compensating wire, again through lead with instrument panel on the flashing signal alarm join, constitute the mechanism for monitoring of secondary steam temperature.
3, the reducing-and-cooling plant that is used to generate electricity according to claim 1 is characterized in that mixer (36) outlet port is equipped with steam sampling pipeline behind the pressure and temperature reducing, and it is to be communicated with steam sampling cooler (25) by stop valve (26), (27) to constitute.
4, the reducing-and-cooling plant that is used to generate electricity according to claim 1, it is characterized in that in exporter's pipeline of cooling water modulating valve (30) the attaching cooling water pressure, the temperature monitoring mechanism that constitute by Gauge Valves (31), differential teletransmission pressure gauge (32), moving-coil table (33) and thermocouple (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91202964 CN2091354U (en) | 1991-02-22 | 1991-02-22 | Cooling and pressure-relief device for generating electricity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91202964 CN2091354U (en) | 1991-02-22 | 1991-02-22 | Cooling and pressure-relief device for generating electricity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2091354U true CN2091354U (en) | 1991-12-25 |
Family
ID=4913389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91202964 Withdrawn CN2091354U (en) | 1991-02-22 | 1991-02-22 | Cooling and pressure-relief device for generating electricity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2091354U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387962C (en) * | 2005-08-08 | 2008-05-14 | 承慰才 | Self-regulating type vapor sampling rack for super (super) critical generator set |
| CN101137482B (en) * | 2005-03-07 | 2010-09-08 | 富士胶片株式会社 | Method for casting solution |
| CN106642070A (en) * | 2015-10-28 | 2017-05-10 | 北京兆阳光热技术有限公司 | Steam-steam mixing and cooling device, system and method for turbine |
| CN107401739A (en) * | 2016-05-19 | 2017-11-28 | 华电电力科学研究院 | Intelligent pressure and temperature reducing energy-saving control system |
| CN108757064A (en) * | 2018-04-09 | 2018-11-06 | 中国船舶重工集团公司第七O三研究所无锡分部 | Steam supply system for Turbo-generator Set dynamic performance testing |
| CN109210375A (en) * | 2018-10-16 | 2019-01-15 | 马鞍山沐及信息科技有限公司 | A kind of Desuperheating and decompressing device for steam |
-
1991
- 1991-02-22 CN CN 91202964 patent/CN2091354U/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101137482B (en) * | 2005-03-07 | 2010-09-08 | 富士胶片株式会社 | Method for casting solution |
| CN100387962C (en) * | 2005-08-08 | 2008-05-14 | 承慰才 | Self-regulating type vapor sampling rack for super (super) critical generator set |
| CN106642070A (en) * | 2015-10-28 | 2017-05-10 | 北京兆阳光热技术有限公司 | Steam-steam mixing and cooling device, system and method for turbine |
| CN107401739A (en) * | 2016-05-19 | 2017-11-28 | 华电电力科学研究院 | Intelligent pressure and temperature reducing energy-saving control system |
| CN108757064A (en) * | 2018-04-09 | 2018-11-06 | 中国船舶重工集团公司第七O三研究所无锡分部 | Steam supply system for Turbo-generator Set dynamic performance testing |
| CN108757064B (en) * | 2018-04-09 | 2021-02-05 | 中国船舶重工集团公司第七O三研究所无锡分部 | Steam supply system for testing dynamic performance of steam turbine generator unit |
| CN109210375A (en) * | 2018-10-16 | 2019-01-15 | 马鞍山沐及信息科技有限公司 | A kind of Desuperheating and decompressing device for steam |
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