CN206267896U - Combined cycle two-shipper condensing-back pressure formula is drawn gas cogeneration system - Google Patents
Combined cycle two-shipper condensing-back pressure formula is drawn gas cogeneration system Download PDFInfo
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- CN206267896U CN206267896U CN201621201283.7U CN201621201283U CN206267896U CN 206267896 U CN206267896 U CN 206267896U CN 201621201283 U CN201621201283 U CN 201621201283U CN 206267896 U CN206267896 U CN 206267896U
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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
- Y02E20/14—Combined heat and power generation [CHP]
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
The utility model is related to main steam turbine technical field, more particularly to a kind of combined cycle two-shipper condensing-back pressure formula is drawn gas cogeneration system, including waste heat boiler, main steam turbine and condenser, main steam turbine includes high, medium and low cylinder pressure, waste heat boiler includes high, medium and low voltage system, and three systems produce three strands of steam respectively：High, medium and low voltage steam, is injected separately into expansion working in high, medium and low cylinder pressure, drives generator output electric energy.First cold section of branch road that draws gas towards the first heat supply network is provided with extraction line at the steam drain of high pressure cylinder, first cold section of draw gas quick closing valve regulating valve and back pressure turbine are sequentially provided with from upstream to downstream on first cold section of branch road that draws gas；Steam valve group is pressed into being provided with the air intake of intermediate cylinder.Low-pressure steam generator and oxygen-eliminating device are provided with low-pressure system, oxygen-eliminating device shares same water tank with low-pressure steam generator.Row's adjustable steam extraction high can be realized, operational efficiency is high, and generating efficiency is high, and high-quality energy waste is few.
Description
Technical field
The utility model is related to steam turbine technology field, more particularly to a kind of combined cycle two-shipper condensing-back pressure formula is drawn gas heat
Chp system.
Background technology
Turbo-generator Set be it is a kind of convert thermal energy into mechanical energy and then be converted into the energy conversion device of electric energy, be electricity
One of crucial power-equipment stood in building.High temperature, the high steam produced by boiler, by steam turbine, by heat energy and pressure
Power potential energy converting and energy, the mechanical energy as steam turbine drives the acting of turbine rotor output shaft, and the mechanical energy passes through turbine rotor
Output shaft passes to generator, so as to convert mechanical energy into electric energy, therefore, steam turbine is commonly referred to as " bright as source motivation
Source ".
Gas-steam combined cycle system refers to, using gas turbine as preposition turbine, combustion gas to be reclaimed with waste heat boiler
The exhaust heat of turbine, some grades of initial steam injection steam turbines of output, steam expansion work output electric energy in steam turbine.
Gas-steam Combined Cycle is the gas turbine with average endothermic temperature higher and has compared with harmonic(-)mean heat release temperature
The steam turbine of degree combines, and the high-temperature tail gas of gas turbine is entered waste heat boiler and produces steam, and makes steam in steam turbine
Middle continuation work done generates electricity, and reaches the purpose maximized favourable factors and minimized unfavourable ones, mutually make up, and makes the heat energy utilization level of whole combined cycle simpler
Circulation is significantly improved, and the net efficiency of combined cycle generation has reached 48%-60%.
Gas-steam combined cycle system conventional at present has the widely used double pressures of E grades of circulating power station, without reheating
Three pressures, reheat system that system and F grades of circulating power station are used.The former generates electricity net efficiency 50% or so, and the latter generates electricity
Net efficiency is 58% or so.
Due to the guide effect of national policy so that Gas-steam Combined Cycle, Cogeneration Project are wide in recent years
General application.So-called heat (cold) Electricity Federation is produced and refers to, extracting a part of steam out at the through-flow suitable location within of steam turbine is used for
Factory steam, original intention is that the rational gradient for realizing the energy is utilized.It is left that the combined cycle efficiency of cogeneration of heat and power can reach 70%
It is right.
The combined cycle of prior art, cogeneration system design are set at the through-flow 1.8MPa of Steam Turbine Through IP Admission or so place
Put rotating barrier or seat cylinder valve and draw gas realizing adjustment, temperature of steam is at 460 DEG C or so at this, and the temperature requirements of user are only
It is 285 DEG C, the temperature difference for existing 175 DEG C is wasted, so that the phenomenon of high-quality energy waste is inevitably occurred in that, meanwhile,
The setting of adjustment mechanism destroys the middle through-flow structure of pressure, causes overall efficiency to decline.
Utility model content
The technical problems to be solved in the utility model is to provide that a kind of unit operation efficiency is high, high-quality energy waste is few
Combined cycle two-shipper condensing-back pressure formula is drawn gas cogeneration system, to overcome the drawbacks described above of prior art.
In order to solve the above-mentioned technical problem, the utility model is adopted the following technical scheme that：A kind of combined cycle two-shipper condensing
Back pressure type draws gas cogeneration system, including waste heat boiler, main steam turbine and condenser, waste heat boiler include high-pressure system, in
Pressure system and low-pressure system；Main steam turbine includes high pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder；The air intake of high pressure cylinder passes through high-pressure admission
The outlet of pipeline and high-pressure system, the steam drain of high pressure cylinder connects the first heat supply network by extraction line, and extraction line passes through
Cold reheaing steam pipe is connected with the jet chimney of medium voltage network, and first cold section towards the first heat supply network is provided with extraction line
Drawn gas branch road, and first cold section of draw gas quick closing valve regulating valve and back pressure are sequentially provided with from upstream to downstream on first cold section of branch road that draws gas
Formula steam turbine；The air intake of intermediate pressure cylinder is pressed into the outlet in steam pipe road and medium voltage network in passing through, in the air intake of intermediate pressure cylinder
Steam valve group is pressed into being provided with；The air intake of low pressure (LP) cylinder is by low pressure admission pipeline and the outlet of low-pressure system, low pressure (LP) cylinder
Steam drain connection condenser；Condenser connects the entrance of low-pressure system；Be provided with low-pressure system low-pressure steam generator and
Oxygen-eliminating device, oxygen-eliminating device shares same water tank with low-pressure steam generator.
Preferably, it is additionally provided with extraction line and first cold section of branch circuit parallel connection and second cold towards the first heat supply network of drawing gas
Section is drawn gas branch road, and being sequentially provided with secondary cooling zone from upstream to downstream on secondary cooling zone draws gas branch road draws gas quick closing valve regulating valve and cold
Section reducing-and-cooling plant.
Preferably, it is pressed between steam pipe road and cold section of reducing-and-cooling plant and is communicated with hot arc and draws gas branch road, in hot arc
The branch road that draws gas is provided with hot arc and draws gas quick closing valve regulating valve.
Preferably, it is pressed into steam pipe road in and the draws gas hot arc that be communicated between branch road of secondary cooling zone draws gas branch road, and hot arc
The branch road that the draws gas branch road that drawn gas with secondary cooling zone in the cold section of downstream of reducing-and-cooling plant is connected；From upstream on hot arc draws gas branch road
Hot arc is sequentially provided with to downstream to draw gas quick closing valve regulating valve and hot arc reducing-and-cooling plant.
Preferably, the middle pressure being provided with the steam drain of intermediate pressure cylinder towards the second heat supply network is drawn gas branch road, and middle pressure is drawn gas branch road
Middle pressure is provided with to draw gas quick closing valve regulating valve.
Preferably, it is provided with first clutch between intermediate pressure cylinder and the armature spindle of low pressure (LP) cylinder.
Preferably, back pressure turbine is arranged or single shaft arrangement with main steam turbine using split axle.
Preferably, the first generator is provided with the rotor of output shaft axle of high pressure cylinder, the armature spindle of back pressure turbine passes through
Shaft coupling or second clutch are connected with the first generator.
Preferably, individually to divide cylinder, intermediate pressure cylinder and low pressure (LP) cylinder are conjunction cylinder to high pressure cylinder.
Preferably, low pressure (LP) cylinder is provided with two, and the 3rd clutch is provided between two armature spindles of low pressure (LP) cylinder.
Preferably, two amount of capacity of low pressure (LP) cylinder are different.
Preferably, high pressure cylinder and intermediate pressure cylinder are independent point of cylinder or conjunction cylinder, in the rotor of output shaft axle of high pressure cylinder or intermediate pressure cylinder
It is provided with the first generator.
Preferably, low pressure (LP) cylinder is double split flow structure or single current structure.
Preferably, back pressure turbine is single current structure or double split flow structure.
Preferably, medium voltage network includes the middle pressure economizer, middle pressure steam generator, the middle pressure superheater and again that are sequentially communicated
Hot device, cold reheaing steam pipe is connected with the entrance of reheater, and the outlet of reheater is pressed into vapour pipeline communication with；High-pressure system
Including the high-pressure economizer, high pressure steam generator and the high-pressure superheater that are sequentially communicated；The outlet of oxygen-eliminating device is connected with high pressure
Feed pump, the outlet of high pressure feed pump is all connected with middle pressure economizer, high-pressure economizer.
Preferably, it is provided with medium voltage network pressure retaining valve on the jet chimney between middle pressure superheater and reheater.
Preferably, also including water charging system, water charging system is arranged in oxygen-eliminating device or in the hot well of condenser or solidifying
On the outlet conduit of vapour device.
Compared with prior art, the utility model has significant progressive：
When without heat demand, first cold section the first of the branch road that draws gas cold section quick closing valve regulating valve of drawing gas is closed,
In be pressed into steam valve group and be shown in a fully open operation, main steam turbine runs under being in pure condensed steam formula operating mode, then the utility model has and biography
The condensing-type association circulating power generation system identical operational mode and identical generating efficiency of system, with traditional cogeneration, connection
Close the section that rotating barrier or seat cylinder valve of the circulatory system inside without main steam turbine under supplying thermal condition in through-flow middle intermediate pressure cylinder are caused
Stream loss is still present to be compared, and generating efficiency tool of the present utility model is significantly improved.It is cold by first when there is heat demand
Section draw gas quick closing valve regulating valve and in be pressed into steam valve group and realize the adjustment amount of drawing gas needed for the first heat supply network, the steam temperature of high pressure steam discharge
Degree will be much smaller than the temperature that prior art main steam turbine intermediate pressure cylinder realizes adjusting the place's steam that draws gas, therefore, the utility model is than existing
The temperature difference for having technology wastes much smaller, so that the high-quality energy waste phenomenon of prior art significantly improves.Additionally, this
Rotating barrier or built-in type steam pumping regulating valve, the through-flow interior effect of main steam turbine need not be set in the main steam turbine of utility model is through-flow
Internal efficiency of the rate apparently higher than the steam-extracting type main steam turbine of outfit under traditional mode.The utility model is in height row extraction opening and warm
A back pressure turbine is set up between net, when solving row's extraction pressure high apparently higher than heating network pressure, height row's pressure potential wave
The problem taken so that during cogeneration, the gradient of the energy is using more reasonable.
Brief description of the drawings
Fig. 1 is that the draw gas structure of cogeneration system of combined cycle two-shipper condensing-back pressure formula of the utility model embodiment is shown
It is intended to.
Fig. 2 is that the combined cycle two-shipper condensing-back pressure formula of the utility model embodiment is drawn gas back pressure type in cogeneration system
The structural representation that steam turbine is arranged with main steam turbine single shaft.
Fig. 3 is that the combined cycle two-shipper condensing-back pressure formula of the utility model embodiment is drawn gas the main steamer of cogeneration system
Machine is provided with structural representation during two low pressure (LP) cylinders.
In figure：
1st, waste heat boiler 1.1, high-pressure economizer 1.2, high pressure steam generator
1.3rd, high-pressure superheater 1.4, middle pressure economizer 1.5, middle pressure steam generator
1.6th, middle pressure superheater 1.7, reheater 1.8, low-pressure coal saver
1.9th, low-pressure steam generator 1.10, low-pressure superheater 1.11, gas turbine smoke-exhaust pipeline
2nd, main steam turbine 2.1, high-pressure admission pipeline 2.2, cold reheaing steam pipe
2.3rd, steam pipe road 2.4,2.5, first cold section of branch road that draws gas of low pressure admission pipeline are pressed into
2.6th, hot arc draws gas branch road 2.7, high pressure turbine by 2.8, intermediate pressure by-pass
2.9th, low voltage bypass 2.10, air pipeline 2.11, secondary cooling zone draw gas branch road
2.12nd, it is middle to press draw gas branch road 2.13, extraction line 3, condenser
4th, oxygen-eliminating device 5, condensate pump 6, high pressure feed pump
7th, water charging system 8, hot well 9, the first generator
10th, the first heat supply network 11, back pressure turbine 12, the second generator
13rd, cold section of reducing-and-cooling plant 14, hot arc reducing-and-cooling plant 15, high-pressure admission valve group
16th, steam valve group 17, low pressure admission valve group 18, high exhaust check valve are pressed into
19th, row's shut-off valve 20 high, cold section of 21, first cold section of the shut-off valve that draws gas draw gas quick closing valve regulating valve
22nd, safety valve 23, regulating valve 24, secondary cooling zone are drawn gas quick closing valve regulating valve
25th, the hot arc shut-off valve 26, hot arc that draws gas draws gas quick closing valve regulating valve 27, high pressure bypass valve
28th, intermediate pressure by-pass valve 29, low voltage bypass valve 30, row's ventilation valve high
31st, medium voltage network pressure retaining valve 32, middle pressure non-return valve 33, middle pressure are drawn gas quick closing valve regulating valve
34th, the second heat supply network 35, first clutch 36, regulation valve group
37th, second clutch 38, the 3rd clutch HP, high pressure cylinder
IP, intermediate pressure cylinder LP, low pressure (LP) cylinder LP1, the first low pressure (LP) cylinder
LP2, the second low pressure (LP) cylinder
Specific embodiment
Specific embodiment of the present utility model is described in further detail below in conjunction with the accompanying drawings.These implementation methods are only
For illustrating the utility model, and it is not limitation of the utility model.
, it is necessary to illustrate in description of the present utility model, term " first ", " second " are only used for describing purpose, and
It is not intended that indicating or implying relative importance.Unless otherwise clearly defined and limited, term " installation ", " connected ", " company
Connect " should be interpreted broadly, for example, it may be being fixedly connected, or being detachably connected, or it is integrally connected；It can be machine
Tool is connected, or electrically connected；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two units
Connection inside part.For the ordinary skill in the art, can as the case may be understand above-mentioned term in this reality
With the concrete meaning in new.
Additionally, in description of the present utility model, unless otherwise indicated, " multiple " is meant that two or more.
As shown in Figure 1 to Figure 3, combined cycle two-shipper condensing-back pressure formula of the present utility model draws gas the one of cogeneration system
Plant embodiment.As shown in figure 1, the combined cycle two-shipper condensing-back pressure formula of the present embodiment is drawn gas, cogeneration system includes waste heat pot
Stove 1, main steam turbine 2 and condenser 3.
Wherein, waste heat boiler 1 includes high-pressure system, medium voltage network and low-pressure system.High-pressure system includes what is be sequentially communicated
High-pressure economizer 1.1, high pressure steam generator 1.2 and high-pressure superheater 1.3.In F grades of Gas-steam Combined Cycle, waste heat
Boiler typically uses drum boiler, and the outlet of high pressure steam generator 1.2 is connected with the entrance of HP steam drum, the outlet of HP steam drum
It is connected with high-pressure superheater 1.3；In H grades of Gas-steam Combined Cycle, when waste heat boiler 1 is using Once-through Boiler, then high steam
The outlet of generator 1.2 is connected with the entrance of steam-water separator, and the outlet of steam-water separator is connected with high-pressure superheater 1.3.In
Pressure system includes the middle pressure economizer 1.4, middle pressure steam generator 1.5, middle pressure superheater 1.6 and the reheater 1.7 that are sequentially communicated.
Low-pressure system includes the low-pressure coal saver 1.8, low-pressure steam generator 1.9 and the low-pressure superheater 1.10 that are sequentially communicated.In low pressure
Oxygen-eliminating device 4 is provided with steam generator 1.9, oxygen-eliminating device 4 shares same water tank, i.e. low-pressure steam with low-pressure steam generator 1.9
The drum of generator 1.9 also serves as the water tank of oxygen-eliminating device 4 simultaneously.
Main steam turbine 2 includes high pressure cylinder HP, intermediate pressure cylinder IP and low pressure (LP) cylinder LP.The air intake of high pressure cylinder HP passes through high-pressure admission
The outlet of pipeline 2.1 and high-pressure system mesohigh superheater 1.3, the steam drain of high pressure cylinder HP is connected by extraction line 2.13
The first heat supply network 10 is connect, extraction line 2.13 is connected by cold reheaing steam pipe 2.2 with the entrance of reheater 1.7 in medium voltage network
It is logical.The outlet of reheater 1.7 is pressed into steam pipe road 2.3 and is connected with the air intake of intermediate pressure cylinder IP in passing through, the steam drain of intermediate pressure cylinder IP
Air intake with low pressure (LP) cylinder LP is connected.The air intake of low pressure (LP) cylinder LP is by low pressure admission pipeline 2.4 and low-pressure system mesolow mistake
The outlet of hot device 1.10, the steam drain connection condenser 3 of low pressure (LP) cylinder LP.The connection low-pressure system mesolow of condenser 3 saves coal
The entrance of device 1.8, condensate pump 5 is provided with the connecting pipe of condenser 3 and low-pressure coal saver 1.8.Low-pressure coal saver 1.8
The entrance of outlet connection low-pressure steam generator 1.9 and oxygen-eliminating device 4, the outlet of oxygen-eliminating device 4 is connected with high pressure feed pump 6, high
The outlet of middle pressure feed pump 6 is all connected with middle pressure economizer 1.4, high-pressure economizer 1.1.
The main steam turbine 2 of the present embodiment can include one or two low pressure (LP) cylinder LP, using high pressure cylinder HP and intermediate pressure cylinder IP
Close cylinder, low pressure (LP) cylinder LP single currents structure or double split flow structure；Cylinder, intermediate pressure cylinder IP and low pressure (LP) cylinder can also individually be divided using high pressure cylinder HP
LP closes the structure of cylinder, intermediate pressure cylinder IP and low pressure (LP) cylinder LP following currents or arrangement of backflowing.The main steam turbine 2 of the present embodiment is to divide cylinder thrust certainly
The steam turbine of balance.When low pressure (LP) cylinder LP is provided with two, as shown in figure 3, two low pressure (LP) cylinder LP are using the structure of double split flow.When
So, two low pressure (LP) cylinder LP can also using the structure of single current, or low pressure (LP) cylinder LP double split flows, LP is mono- for another low pressure (LP) cylinder
The structure of stream.Intermediate pressure cylinder IP is connected with the first low pressure (LP) cylinder LP1 and the second low pressure (LP) cylinder LP2 successively, in the first low pressure (LP) cylinder LP1 and second
The 3rd clutch 38 is provided between the armature spindle of low pressure (LP) cylinder LP2, now, high pressure cylinder HP and intermediate pressure cylinder IP can be using independent point
The structure of cylinder, the first generator 9 is located in the rotor of output shaft axle of high pressure cylinder HP；High pressure cylinder HP and intermediate pressure cylinder IP can also be using conjunction
The structure of cylinder, the first generator 9 then can be both located in the rotor of output shaft axle of high pressure cylinder HP, it is also possible to be located at turning for intermediate pressure cylinder IP
On sub- output shaft.The capacity of the first low pressure (LP) cylinder LP1 and the second low pressure (LP) cylinder LP2 can be set to difference, i.e. the first low pressure (LP) cylinder LP1 and
The exhaust stage blade of two low pressure (LP) cylinder LP2 is differed.Size according to demand of drawing gas designs the capacity of the second low pressure (LP) cylinder LP2, can be with
Ensure that the first low pressure (LP) cylinder LP1 efficiency under specified operating mode of drawing gas is optimal.Specifically, away from the second low pressure (LP) cylinder of the first generator 9
LP2 enter steam flow amount be set to it is suitable with the specified heat supply amount of drawing gas, so in the case where operating mode is drawn gas in heat supply, the second low pressure (LP) cylinder LP2 solution
Row, are still able to maintain that the throttle flow of the first low pressure (LP) cylinder LP1 is suitable with the throttle flow of pure condensate operating mode, ensure that the first low pressure
The cylinder of cylinder LP1 is imitated and still remains efficient under operating mode of drawing gas.
The present embodiment is provided with high-pressure admission valve group 15 on the air intake of high pressure cylinder HP, is set on the air intake of intermediate pressure cylinder IP
Have and be pressed into steam valve group 16, low pressure admission valve group 17 is provided with the air intake of low pressure (LP) cylinder LP, be respectively used to control and adjust height
The throttle flow of pressure steam, middle pressure steam (i.e. reheat heat steam) and low-pressure steam.High-pressure admission valve group 15 includes the high pressure of series connection
Stop valve and septum valve, in be pressed into steam valve group 16 include series connection middle pressure stop valve and reheat control valve, low pressure admission valve
Group 17 includes the low pressure stop valve and low pressure modulating valve of series connection.The upstream of cold reheaing steam pipe 2.2 on extraction line 2.13
High exhaust check valve 18 is provided with, for preventing row's steam (i.e. cold reheated steam) high from flowing backwards into high pressure cylinder HP.
The smoke evacuation of gas turbine enters waste heat boiler 1 by gas turbine smoke-exhaust pipeline 1.11, is the high pressure of waste heat boiler 1
Superheater 1.3, high pressure steam generator 1.2, high-pressure economizer 1.1, reheater 1.7, middle pressure superheater 1.6, middle pressure steam hair
Raw device 1.5, middle pressure economizer 1.4, low-pressure superheater 1.10, low-pressure steam generator 1.9, low-pressure coal saver 1.8 provide heat,
High-pressure system, medium voltage network and low-pressure system is set to produce three strands of steam respectively：High steam, middle pressure steam and low-pressure steam, point
Not Tong Guo high-pressure admission pipeline 2.1 and high-pressure admission valve group 15, in be pressed into steam pipe road 2.3 and in be pressed into steam valve group 16, low pressure and enter
In steam pipe road 2.4 and the injection high pressure cylinder of low pressure admission valve group 17 HP, intermediate pressure cylinder IP, low pressure (LP) cylinder LP.
The combined cycle two-shipper condensing-back pressure formula of the present embodiment cogeneration system that draws gas is additionally provided with water charging system 7, moisturizing
System 7 can be arranged in the hot well 8 of condenser 3, it is also possible to be arranged in oxygen-eliminating device 4, can also be arranged on condenser 3 with it is low
Pressure economizer 1.8 connection outlet conduit on, under operating mode of drawing gas to the combined cycle two-shipper condensing-back pressure of the present embodiment
The formula cogeneration system that draws gas supplements corresponding water.By taking the water charging system 7 being arranged in the hot well 8 of condenser 3 as an example, the water of supplement
After carrying out preliminary deoxygenation in hot well 8, into the condensate system of condenser 3, in the presence of condensate pump 5, deliver to remaining
Exchanged heat in the low-pressure coal saver 1.8 of heat boiler 1, then, into low-pressure steam generator 1.9 and oxygen-eliminating device 4, low-pressure steam hair
The low-pressure saturated steam produced in raw device 1.9 enters low-pressure superheater 1.10 and further absorbs heat, while occurring using low-pressure steam
The low-pressure saturated steam produced in device 1.9 carries out sufficient thermal de-aeration to condensate, then, by 6 points of high pressure feed pump
Not by the middle pressure economizer 1.4 and high-pressure economizer 1.1 of feeding waste heat boiler 1 of feeding water, coal is saved by middle pressure economizer 1.4, high pressure
Device 1.1 is heated water to close to saturation.Then, the water in middle pressure economizer 1.4 enters middle pressure steam generator 1.5, and high pressure is saved
Water in coal device 1.1 enters high pressure steam generator 1.2, and aqueous water is converted into steam (as shown in figure 1, dotted portion is liquid
State water, bold portion is water vapour)；Then, the steam for being produced by high pressure steam generator 1.2 and middle pressure steam generator 1.5
High-pressure superheater 1.3 and reheater 1.7 are respectively enterd, are exchanged heat in high-pressure superheater 1.3 and reheater 1.7, produce superheated steam,
Again respectively by high-pressure admission pipeline 2.1 and high-pressure admission valve group 15, in be pressed into steam pipe road 2.3 and in be pressed into steam valve group 16 and enter
Corresponding high pressure cylinder HP and intermediate pressure cylinder IP, makes main steam turbine 2 do work, and drives the output electric energy of the first generator 9, completes the present embodiment
Whole system thermodynamic cycle.
The present embodiment is provided with first cold section of branch road 2.5 that draws gas towards the first heat supply network 10 on extraction line 2.13,
On one cold section of branch road 2.5 that draws gas first cold section of draw gas quick closing valve regulating valve 21 and back pressure turbine are sequentially provided with from upstream to downstream
11.The steam drain of back pressure turbine 11 is connected by pipeline with the first heat supply network 10, in the heat supply network of back pressure turbine 11 and first
The pipeline of 10 connections is provided with a safety valve 22 and a regulating valve 23.The back pressure of back pressure turbine 11 can be set to the first heat supply network 10
Heat demand pressure, so as to be embodied as the first heat supply network 10 provide the steam matched with its demand parameter, it is to avoid in system
Middle to set multistage reducing-and-cooling plant, simple structure can reduce energy loss, it is to avoid high-quality energy waste.By first
Cold section of quick closing valve regulating valve 21 of drawing gas is pressed into steam valve group 16 with can realize the flow point of Stress control and high pressure steam discharge at row high
Match somebody with somebody, so as to realize adjustable steam extraction.Back pressure turbine 11 in the present embodiment can use single current structure, it would however also be possible to employ double
Flow dividing structure.
Back pressure turbine 11 can be arranged using split axle as shown in Figure 1 with main steam turbine 2, driven by main steam turbine 2
First generator 9 generates electricity；The second generator 12 is driven to generate electricity by back pressure turbine 11, the second generator 12 is small generators.
The main steam turbine 2 shown in Fig. 1, its high pressure cylinder HP, intermediate pressure cylinder IP and low pressure (LP) cylinder LP are a point cylinder structure, and low pressure (LP) cylinder LP is double points
Flow structure, the first generator 9 is located in the rotor of output shaft axle of low pressure (LP) cylinder LP.It should be noted that when being arranged using split axle, main vapour
The structure of turbine 2 is not limited to the structure shown in Fig. 1, it would however also be possible to employ other structures.
Back pressure turbine 11 can also be arranged with main steam turbine 2 using single shaft as shown in Figure 2, in turning for high pressure cylinder HP
Sub- output shaft is provided with the first generator 9, and the armature spindle of back pressure turbine 11 is connected with the rotating shaft of the first generator 9.Back pressure
The armature spindle of formula steam turbine 11 can be rigidly connected by shaft coupling with the first generator 9, it is also possible to by second clutch 37
It is connected with the first generator 9, the armature spindle of the back pressure turbine 11 shown in Fig. 2 is generated electricity by second clutch 37 and first
Machine 9 is connected.The second generator 12 is now not provided with, the first generator 9 is driven by main steam turbine 2 and back pressure turbine 11 jointly
Generate electricity.Preferably, as shown in Fig. 2 main steam turbine 2 individually divides cylinder, intermediate pressure cylinder IP and low pressure (LP) cylinder LP to close cylinder using high pressure cylinder HP
Structure, the first generator 9 is located in the rotor of output shaft axle of high pressure cylinder HP, and second clutch 37 is located at the first generator 9 and back pressure
Between the armature spindle of formula steam turbine 11.Certainly, when being arranged using single shaft, the structure of main steam turbine 2 is also not limited to show in Fig. 2
The structure for going out, it would however also be possible to employ other structures.Single shaft advantage of the arrangement with compact conformation, can also save a small hair in addition
Motor, i.e. the second generator 12 can be saved.
Further, the secondary cooling zone for being also provided with extraction line 2.13 leading to the first heat supply network 10 draws gas branch road
2.11, the secondary cooling zone branch road 2.11 that draws gas is in parallel with first cold section of branch road 2.5 that draws gas, on secondary cooling zone draws gas branch road 2.11 from
Upstream to downstream is sequentially provided with secondary cooling zone and draws gas quick closing valve regulating valve 24 and cold section of reducing-and-cooling plant 13.Taken out by secondary cooling zone
The steam flow extracted in branch road 2.11 that can be drawn gas to secondary cooling zone of vapour quick closing valve regulating valve 24 is controlled and adjusts, by cold
Section reducing-and-cooling plant 13 steam extracted in branch road 2.11 that can be drawn gas to secondary cooling zone carries out pressure and temperature reducing treatment, make its with
The heat demand of the first heat supply network 10 matches.Thus, the back pressure turbine 11 for being drawn gas on branch road 2.5 at first cold section can not expire
During the heat demand of the first heat supply network 10 of foot, branch road 2.11 can be drawn gas to the heat supply of the first heat supply network 10 from secondary cooling zone.
Preferably, the downstream of the present embodiment cold reheaing steam pipe 2.2 on extraction line 2.13 can set one cold section
Draw gas shut-off valve 20, cold section of shut-off valve 20 that draws gas draws gas branch road 2.5 positioned at first cold section and secondary cooling zone draws gas branch road 2.11
Upstream.When there is heat demand, first cold section is drawn gas quick closing valve regulating valve 21 and secondary cooling zone quick closing valve regulating valve 24 of drawing gas is opened, cold
The section shut-off valve 20 that draws gas is in normally open, and first cold section is drawn gas branch road 2.5 and secondary cooling zone draws gas the normal work of branch road 2.11.
If now the first heat supply network 10 breaks down, first cold section of He of branch road 2.5 of drawing gas can be cut off by closing the cold section of shut-off valve 20 that draws gas
Secondary cooling zone draws gas the circulation status of branch road 2.11, disconnects the connection of the heat supply network 10 of extraction line 2.13 and first, so as to avoid because
The fault impact main steam turbine 2 of first heat supply network 10 is run and causes compressor emergency shutdown, and protection is played to set grid-connection safe and stable operation
Effect.When without heat demand, first cold section is drawn gas quick closing valve regulating valve 21 and secondary cooling zone quick closing valve regulating valve 24 of drawing gas is closed, by
Quick closing valve regulating valve 21 of being drawn gas in first cold section and secondary cooling zone quick closing valve regulating valve 24 of drawing gas there may be the close problem that is not closed completely
And easily produce cold reheated steam to leak, now by closing the cold section of shut-off valve 20 that draws gas, ensure that and first cold section is drawn gas
Branch road 2.5 and the secondary cooling zone branch road 2.11 that draws gas are closed tightly, it is to avoid cold reheated steam leakage occurs and wastes.
Further, it is pressed into steam pipe road 2.3 in and the draws gas hot arc that be communicated between branch road 2.11 of secondary cooling zone draws gas branch road
2.6, and the hot arc branch road 2.11 that drawn gas with secondary cooling zone in the cold section of downstream of reducing-and-cooling plant 13 of branch road 2.6 that draws gas is connected,
Hot arc draws gas and is sequentially provided with hot arc from upstream to downstream on branch road 2.6 and draws gas quick closing valve regulating valve 26 and hot arc reducing-and-cooling plant
14.Through the steam after the cold section of pressure and temperature reducing of reducing-and-cooling plant 13 and through the steam after the pressure and temperature reducing of hot arc reducing-and-cooling plant 14
The heat supply of the first heat supply network 10 is sent into after mixing.Certainly, hot arc draw gas be pressed into during branch road 2.6 can also be connected to steam pipe road 2.3 with it is cold
Between section reducing-and-cooling plant 13, and hot arc is set on hot arc draws gas branch road 2.6 draws gas quick closing valve regulating valve 26.Now hot arc is taken out
Vapour branch road 2.6 and the secondary cooling zone branch road 2.11 that draws gas share cold section of reducing-and-cooling plant 13, and hot arc draws gas the heat of the extraction of branch road 2.6
Reheated steam and secondary cooling zone draw gas branch road 2.11 extraction cold reheated steam mix and subtract at cold section of reducing-and-cooling plant 13
The heat supply of the first heat supply network 10 is sent into after temperature decompression.Hot arc in the present embodiment draws gas quick closing valve regulating valve 26 for adjusting and controlling hot arc
Draw gas and the flow of steam is extracted in branch road 2.6, when heat demand increases, hot arc can be opened and drawn gas quick closing valve regulating valve 26, open
Open hot arc to draw gas branch road 2.6, the part reheat heat steam in steam pipe road 2.3, and the reheat heat steam that will be extracted are pressed into extraction
With secondary cooling zone draw gas branch road 2.11 extraction cold reheated steam mix after send into the heat supply of the first heat supply network 10, to increase total drawing gas
Flow, meets the heat demand of the first heat supply network 10.
Preferably, a hot arc can be set on hot arc draws gas branch road 2.6 to draw gas shut-off valve 25, hot arc draws gas shut-off valve 25
The upstream of quick closing valve regulating valve 26 of being drawn gas in hot arc.When hot arc draw gas branch road 2.6 also assist in heat supply when, with the cold section of shut-off valve 20 that draws gas
In the same manner, the hot arc shut-off valve 25 that draws gas is in normally open, and hot arc draws gas the normal work of branch road 2.6.If now the first heat supply network 10
Break down, can cut off hot arc and draw gas the circulation status of branch road 2.6 by closing the hot arc shut-off valve 25 that draws gas, vapour is pressed into disconnection
The connection of the heat supply network 10 of pipeline 2.3 and first, so as to avoid causing machine because the fault impact turbine system of the first heat supply network 10 runs
Group is shut down, and set grid-connection safe and stable operation is played a protective role.Under non-supplying thermal condition, due to hot arc draw gas quick closing valve regulation
Valve 26 there may be and be not closed completely close problem and easily produce reheat heat steam to leak, and now be drawn gas shut-off by closing hot arc
Valve 25, ensure that and close tightly the hot arc branch road 2.6 that draws gas, it is to avoid the leakage of reheat heat steam occurs and wastes.
Further, the middle pressure that the present embodiment is provided with towards the second heat supply network 34 at the steam drain of intermediate pressure cylinder IP is drawn gas branch road
2.12, middle pressure being drawn gas on branch road 2.12 be sequentially provided with middle pressure non-return valve 32 from upstream to downstream and middle pressure is drawn gas quick closing valve regulating valve
33.The steam that middle pressure non-return valve 32 is used to preventing middle pressure from drawing gas in branch road 2.12 is blowed back into intermediate pressure cylinder IP, and middle pressure is drawn gas quick closing valve
Regulating valve 33 presses the flow of extraction steam in the branch road 2.12 that draws gas in being used to adjust.
Preferably, first clutch 35 can be set between the armature spindle of intermediate pressure cylinder IP and low pressure (LP) cylinder LP, when the second heat
When extraction flow in the heat demand of net 34 is larger, middle pressure is drawn gas branch road 2.12 is larger, first clutch 35 can be unlocked,
And block low pressure (LP) cylinder LP enter vapour, making the rotating speed of the rotor of output shaft axle of low pressure (LP) cylinder LP is reduced, and first clutch 35 is disengaged automatically, from
And the online off-the-line of low pressure (LP) cylinder LP is realized, it is possible thereby to play a part of to save minimum cooling flow in low pressure (LP) cylinder LP, in raising
The extraction flow of the branch road 2.12 that draws gas is pressed, presses extraction for heat supply to maximize in realization.
The first heat supply network 10 in the present embodiment is industrial heat supply network, is drawn gas by first cold section of branch road 2.5, secondary cooling zone that draws gas
The draw gas mutual cooperation of branch road 2.6 of branch road 2.11 and hot arc can meet the extraction steam for factories demand of the first heat supply network 10.Second heat
Net 34 is heating heat supply network, can be met the heating of the second heat supply network 34 and is drawn gas demand by the middle pressure branch road 2.12 that draws gas.Thus, this reality
Apply example combined cycle two-shipper condensing-back pressure formula draw gas cogeneration system can realize simultaneously for two heat demands it is different
Heat supply network heat supply, with good flexibility and adaptability.
Additionally, the present embodiment is communicated with high pressure turbine by between high-pressure admission pipeline 2.1 and cold reheaing steam pipe 2.2
2.7, high pressure turbine by 2.7 is provided with high pressure bypass valve 27；It is pressed into being communicated between steam pipe road 2.3 and condenser 3 and presses other
Road 2.8, intermediate pressure by-pass 2.8 is provided with intermediate pressure by-pass valve 28；Low pressure is communicated between low pressure admission pipeline 2.4 and condenser 3
Bypass 2.9, low voltage bypass 2.9 is provided with low voltage bypass valve 29；Ventilation duct is communicated between extraction line 2.13 and condenser 3
Road 2.10, air pipeline 2.10 is located at the upstream of high exhaust check valve 18, and air pipeline 2.10 is provided with row's ventilation valve 30 high.
One bypass system is collectively constituted by high pressure turbine by 2.7, intermediate pressure by-pass 2.8, low voltage bypass 2.9 and air pipeline 2.10
System, the bypath system can make main steam turbine 2 when non-matched state run, the quantity of steam and main steamer of the generation of waste heat boiler 1
The difference of the quantity of steam required for machine 2 can not pass through the circulation part of main steam turbine 2, but by bypath system, bypass system
High pressure bypass valve 27, intermediate pressure by-pass valve 28, low voltage bypass valve 29 and row's ventilation valve 30 high in system include steam converter valve, from
And the steam of elevated pressures, higher temperature is reduced to required steam parameter, then introduce steam into the connection of condenser 3
System, the need for meeting whole system safe operation.Bypath system prevents unit from surpassing the cold, warm of main steam turbine 2, thermal starting
Pressure, reclaims working medium and is respectively provided with good function, whole thermoelectricity is all played for the stability of system, security and economy important
Effect.
Preferably, the present embodiment can set row's shut-off valve 19 high on extraction line 2.13, and height row's shut-off valve 19 is located at
The downstream of high exhaust check valve 18, and positioned at the upstream of cold reheaing steam pipe 2.2.
Additionally, being additionally provided with a regulation valve group 36 on low pressure admission pipeline 2.4, regulation valve group 36 is located at low pressure admission valve group
17 upstream.In big flow, row high draws gas under operating mode, and the regulating valve in regulation valve group 36 can also control low pressure admission valve group 17
Preceding pressure.
Preferably, it is provided with medium voltage network pressure retaining valve on the jet chimney between middle pressure superheater 1.6 and reheater 1.7
31.Under supplying thermal condition, when the change fluctuation of the heat supply network amount of drawing gas is larger, system is pressed in being maintained by medium voltage network pressure retaining valve 31
The pressure stability of system, prevents from producing severe pressure fluctuations in middle pressure superheater 1.6, it is to avoid produced in middle pressure steam generator 1.5
Water-level fluctuation.
Traditional heat supply method is to set rotating barrier or seat cylinder valve inside the intermediate pressure cylinder of main steam turbine to realize adjustment
Draw gas, then temperature of steam is often far above the demand temperature of user at this, so as to high-quality energy wave inevitably occur
The phenomenon taken.In addition, under without supplying thermal condition, the steam in main steam turbine intermediate pressure cylinder still will flow through rotating barrier or seat cylinder
Valve, so as to there is restriction loss；Further, because of the setting of rotating barrier or seat cylinder valve, make the span of main steam turbine unit larger, receive
The limitation of span, can only select using root footpath relatively high and phase during the through-flow design of traditional cogeneration main steam turbine unit
To few through-flow series, so that the through-flow internal efficiency design load of unit is relatively low；Therefore, traditional cogeneration main steam turbine
Generating efficiency is relatively low.
The steam discharge of first cold section of the present embodiment draws gas branch road 2.5 and secondary cooling zone draws gas branch road 2.11 located at high pressure cylinder HP
On pipeline, because the temperature of steam at high pressure steam discharge is lower not than the temperature of steam at intermediate pressure cylinder IP internal rotatings dividing plate or seat cylinder valve
Few, the demand temperature higher than user is few, therefore, much less is wanted in high-quality energy waste.Also, the present embodiment draws gas in height row
A back pressure turbine 11 is set up between mouth and heat supply network, when solving row's extraction pressure high apparently higher than heating network pressure, row pressure high
The problem that power potential energy is wasted so that during cogeneration, the gradient of the energy is using more reasonable.In addition, when without heat demand, it is main
Steam Turbine can be at running under pure condensed steam formula operating mode, now, draws gas quick closing valve regulating valve 21 by first cold section and secondary cooling zone is taken out
Vapour quick closing valve regulating valve 24 closes, in be pressed into the standard-sized sheet of steam valve group 16, then the present embodiment has and traditional condensing-type combined cycle hair
Electric system identical operational mode and identical generating efficiency.Avoid the rotation in the intermediate pressure cylinder of prior art cogeneration system
Turn the energy loss that dividing plate or seat cylinder valve are caused, therefore, the generating efficiency of the present embodiment compares prior art cogeneration system
Generating efficiency tool be significantly improved.
The present embodiment from pure condensed steam formula operating mode to specified supplying thermal condition conversion process, by control first cold section of quick closing valve that draws gas
Regulating valve 21, secondary cooling zone draw gas quick closing valve regulating valve 24 and in be pressed into steam valve group 16, realize first cold section of branch road 2.5 that draws gas,
Secondary cooling zone draws gas branch road 2.11 and the assignment of traffic of cold reheaing steam pipe 2.2.Now, row's exhaust point (row's check i.e. high high
Valve 18) pressure at place declines, the pressure of the medium voltage network of waste heat boiler 1 also with decline, meanwhile, make to enter waste heat boiler 1
The cold reheated steam amount of cold reheaing steam pipe 2.2 is reduced, then the parameter of reheated steam will have elevated trend, need to be by waste heat pot
Stove 1 carries out spray cooling regulation so that the quality of steam meets the requirement of main steam turbine 2.As shown in figure 1, because of combined cycle
The high pressure steam generator 1.2 of waste heat boiler 1, high-pressure superheater 1.3 use interlaced arrangement with the heat exchange process of reheater 1.7
Form, therefore the reduction of reheated steam amount, can cause the increase of high steam flow so that the high pressure cylinder HP of main steam turbine 2 will
Increase exerting oneself for a part.So as in specified supplying thermal condition, using the present embodiment, compared with traditional system design, main vapour
The increase of exerting oneself of turbine 2, therefore the operational efficiency of main steam turbine 2 of the present embodiment is high, economic benefits.
Steam into the intermediate pressure cylinder IP of main steam turbine 2 is reduced, and the initial steam pressure of low pressure (LP) cylinder LP also decreases, then can be with
The low pressure admission valve group 17 on low pressure admission pipeline 2.4 is opened, the steam produced by low-pressure steam generator 1.9 is through low area overheat
Device 1.10 is exchanged heat, and produces superheated steam, and low pressure (LP) cylinder LP is entered through low pressure admission valve group 17, it is ensured that low pressure (LP) cylinder LP minimum safes are transported
The demand of row pressure.The main steam turbine 2 of the present embodiment is because using a point cylinder thrust self-balancing design, intermediate pressure cylinder IP and low pressure (LP) cylinder LP enter
Reducing for vapour amount will not produce too big change to the thrust of 2 groups of main steam turbine, disclosure satisfy that system safety operation requirement, so that real
Existing one-level adjustable steam extraction requirement.
In actual applications, if certain engineering steam power plant is provided with two sets of combined cycle two-shipper condensing-back pressure formulas of the present embodiment
Draw gas cogeneration system, when wherein a set of failure or maintenance when, in order that heat supply remain to meet two sets when heating load,
Hot arc can be enabled to draw gas branch road 2.6.It is standby when hot arc draws gas branch road 2.6 as wherein a set of failure or maintenance, usually
Hot arc quick closing valve regulating valve 26 of drawing gas is closed, and when another set of failure or maintenance, steam valve group 16 is pressed into passing through first and is adjusted
The pressure of medium voltage network, reaches the pressure for being not less than the demand of the first heat supply network 10, then open again hot arc draw gas quick closing valve regulation
Valve 26, the part reheat heat steam being pressed into by steam pipe road 2.3 by hot arc reducing-and-cooling plant 14 is injected into the first heat supply network
10。
Or, when the heat demand of the first heat supply network 10 further increases, it is also possible to cut off main steam turbine 2, enable heat
Section is drawn gas branch road 2.6, the full cut condition heat supply of main steam turbine is realized, so as to realize the maximization of heat capacity.Now, gas turbine
With waste heat boiler 1 normally run, the high-pressure admission valve group 15 of main steam turbine 2, in be pressed into steam valve group 16, low pressure admission valve group 17 with
And the Close All of high exhaust check valve 18.After high steam enters high-pressure admission pipeline 2.1, can enter in high pressure turbine by 2.7, warp
High pressure bypass valve 27 is passed through in cold reheaing steam pipe 2.2 and is divided into two-way：Wherein enter in extraction line 2.13 all the way, through the
One cold section is drawn gas branch road 2.5 and secondary cooling zone draws gas the feeding heat supply of the first heat supply network 10 of branch road 2.11；Another cold reheating of Lu Zejing is steamed
Steam pipe road 2.2 enters in reheater 1.7, and is pressed into steam pipe road 2.3 in being passed through from the outlet of reheater 1.7, subsequently into heat
Section is drawn gas branch road 2.6, and the shut-off valve 25, hot arc that drawn gas through hot arc draws gas and send into after quick closing valve regulating valve 26 and reducing-and-cooling plant 14 the
The heat supply of one heat supply network 10.Low-pressure steam in waste heat boiler 1 can then send to the first relatively low heat supply network of demand pressure parameter of drawing gas and supply
Heat, it is also possible to through in the feeding condenser 3 of low voltage bypass 2.9.Under this operating mode, height row's shut-off valve 19 is also switched off, and can prevent because of height
Row's non-return valve 18 is not closed completely close and produces steam to leak, it is to avoid high steam is let out by extraction line 2.13 through high exhaust check valve 18
In leaking into high pressure cylinder HP.
Standby hot arc draws gas branch road 2.6 when enabling, and hot arc quick closing valve regulating valve 26 of drawing gas is opened, and hot arc draws gas shut-off valve 25
In normally open, hot arc draws gas the normal work of branch road 2.6.If now the first heat supply network 10 breaks down, can be by closing hot arc
The shut-off valve 25 that draws gas cut-out hot arc draws gas the circulation status of branch road 2.6, disconnects the heat supply network 10 of hot reheat steam line 2.3 and first
Connection, it is steady to set grid-connection safety so as to avoid causing compressor emergency shutdown because the fault impact main steam turbine 2 of the first heat supply network 10 runs
Fixed operation plays a protective role.Hot arc draw gas branch road 2.6 be not involved in heat supply when, hot arc quick closing valve regulating valve 26 of drawing gas is closed, by
There may be and be not closed completely close problem and easily produce reheat heat steam to leak in hot arc quick closing valve regulating valve 26 of drawing gas, now lead to
Cross closing hot arc to draw gas shut-off valve 25, ensure that and close tightly the hot arc branch road 2.6 that draws gas, it is to avoid reheat heat steam occurs and lets out
Leakage is wasted.
Standby hot arc draws gas the process that branch road 2.6 comes into operation, and is the combined cycle two-shipper condensing-back pressure of the present embodiment
The formula cogeneration system that draws gas (specifically refers to first cold section and draws gas branch road 2.5 and secondary cooling zone draws gas branch from maximum operating mode of drawing gas
The maximum on road 2.11 is drawn gas operating mode) it is converted into extreme maximum and draws gas that (first cold section is drawn gas branch road 2.5 and secondary cooling zone draws gas to operating mode
The maximum of the branch road 2.11 operating mode+hot arc that draws gas draws gas the operating mode of drawing gas of branch road 2.6) process.Extreme maximum operating mode of drawing gas is
Standby short-term maximum supplying thermal condition, uses during for other set system overhaul or the full cut condition of failure, main steam turbine.
The above is only preferred embodiment of the present utility model, it is noted that for the ordinary skill people of the art
Member for, on the premise of the utility model know-why is not departed from, some improvement and replacement can also be made, these improve and
Replacement also should be regarded as protection domain of the present utility model.
Claims (17)
1. a kind of combined cycle two-shipper condensing-back pressure formula is drawn gas cogeneration system, it is characterised in that including waste heat boiler (1),
Main steam turbine (2) and condenser (3), the waste heat boiler (1) include high-pressure system, medium voltage network and low-pressure system；The master
Steam turbine (2) includes high pressure cylinder (HP), intermediate pressure cylinder (IP) and low pressure (LP) cylinder (LP)；The air intake of the high pressure cylinder (HP) passes through high pressure
The outlet of steam inlet pipe road (2.1) and the high-pressure system, the steam drain of the high pressure cylinder (HP) passes through extraction line
(2.13) the first heat supply network of connection (10), the extraction line (2.13) is by cold reheaing steam pipe (2.2) and medium pressure system
The jet chimney connection of system, first cold section towards first heat supply network (10) is provided with the extraction line (2.13) and is drawn gas
Branch road (2.5), first cold section of quick closing valve tune that draws gas is sequentially provided with described first cold section of branch road that draws gas (2.5) from upstream to downstream
Section valve (21) and back pressure turbine (11)；The air intake of medium pressure cylinder (IP) be pressed into passing through steam pipe road (2.3) with it is described
The outlet of medium voltage network, is pressed into steam valve group (16) in being provided with the air intake of medium pressure cylinder (IP)；The low pressure (LP) cylinder
(LP) air intake passes through the outlet of low pressure admission pipeline (2.4) and the low-pressure system, the row of the low pressure (LP) cylinder (LP)
Steam ports connects the condenser (3)；The condenser (3) connects the entrance of the low-pressure system；Set in the low-pressure system
There are low-pressure steam generator (1.9) and oxygen-eliminating device (4), the oxygen-eliminating device (4) shares same with the low-pressure steam generator (1.9)
One water tank.
2. combined cycle two-shipper condensing-back pressure formula according to claim 1 is drawn gas cogeneration system, it is characterised in that
It is additionally provided with the extraction line (2.13) in parallel with described first cold section of branch road that draws gas (2.5) and towards the first heat supply network (10)
Secondary cooling zone is drawn gas branch road (2.11), and second is sequentially provided with from upstream to downstream on the secondary cooling zone draws gas branch road (2.11)
Cold section of draw gas quick closing valve regulating valve (24) and cold section of reducing-and-cooling plant (13).
3. combined cycle two-shipper condensing-back pressure formula according to claim 2 is drawn gas cogeneration system, it is characterised in that
Hot arc is communicated between medium pressure steam inlet pipe road (2.3) and the cold section of reducing-and-cooling plant (13) to draw gas branch road (2.6),
The hot arc branch road (2.6) that draws gas is provided with hot arc and draws gas quick closing valve regulating valve (26).
4. combined cycle two-shipper condensing-back pressure formula according to claim 2 is drawn gas cogeneration system, it is characterised in that
The draws gas hot arc that be communicated between branch road (2.11) of medium pressure steam inlet pipe road (2.3) and the secondary cooling zone draws gas branch road (2.6),
And the hot arc branch road (2.6) that draws gas draws gas branch road in the downstream of the cold section of reducing-and-cooling plant (13) with the secondary cooling zone
(2.11) connect；Hot arc is sequentially provided with the hot arc draws gas branch road (2.6) from upstream to downstream to draw gas quick closing valve regulating valve
And hot arc reducing-and-cooling plant (14) (26).
5. combined cycle two-shipper condensing-back pressure formula according to claim 1 is drawn gas cogeneration system, it is characterised in that
The middle pressure being provided with the steam drain of medium pressure cylinder (IP) towards the second heat supply network (34) is drawn gas branch road (2.12), and medium pressure is drawn gas
Branch road (2.12) is provided with middle pressure and draws gas quick closing valve regulating valve (33).
6. combined cycle two-shipper condensing-back pressure formula according to claim 5 is drawn gas cogeneration system, it is characterised in that
First clutch (35) is provided between medium pressure cylinder (IP) and the armature spindle of the low pressure (LP) cylinder (LP).
7. combined cycle two-shipper condensing-back pressure formula according to claim 1 is drawn gas cogeneration system, it is characterised in that institute
Back pressure turbine (11) is stated to be arranged using split axle with the main steam turbine (2) or single shaft arrangement.
8. combined cycle two-shipper condensing-back pressure formula according to claim 7 is drawn gas cogeneration system, it is characterised in that
The rotor of output shaft axle of the high pressure cylinder (HP) is provided with the first generator (9), and the armature spindle of the back pressure turbine (11) leads to
Shaft coupling or second clutch (37) is crossed to be connected with first generator (9).
9. combined cycle two-shipper condensing-back pressure formula according to claim 7 is drawn gas cogeneration system, it is characterised in that institute
High pressure cylinder (HP) is stated individually to divide cylinder, medium pressure cylinder (IP) and the low pressure (LP) cylinder (LP) are conjunction cylinder.
10. combined cycle two-shipper condensing-back pressure formula according to claim 1 is drawn gas cogeneration system, it is characterised in that
The low pressure (LP) cylinder (LP) is provided with two, and the 3rd clutch (38) is provided between two armature spindles of the low pressure (LP) cylinder (LP).
11. combined cycle two-shipper condensing-back pressure formulas according to claim 10 are drawn gas cogeneration system, it is characterised in that
Two amount of capacity of the low pressure (LP) cylinder (LP) are different.
12. combined cycle two-shipper condensing-back pressure formulas according to claim 10 are drawn gas cogeneration system, it is characterised in that
The high pressure cylinder (HP) is independent point of cylinder or conjunction cylinder with medium pressure cylinder (IP), in the high pressure cylinder (HP) or medium pressure cylinder
(IP) rotor of output shaft axle is provided with the first generator (9).
13. combined cycle two-shipper condensing-back pressure formulas according to claim 10 are drawn gas cogeneration system, it is characterised in that
The low pressure (LP) cylinder (LP) is double split flow structure or single current structure.
14. combined cycle two-shipper condensing-back pressure formulas according to claim 1 are drawn gas cogeneration system, it is characterised in that
The back pressure turbine (11) is single current structure or double split flow structure.
15. combined cycle two-shipper condensing-back pressure formulas according to claim 1 are drawn gas cogeneration system, it is characterised in that
Medium pressure system includes the middle pressure economizer (1.4), middle pressure steam generator (1.5), middle pressure superheater (1.6) that are sequentially communicated
With reheater (1.7), the cold reheaing steam pipe (2.2) connects with the entrance of the reheater (1.7), the reheater
(1.7) outlet is connected with medium pressure steam inlet pipe road (2.3)；The high-pressure system includes the high-pressure economizer being sequentially communicated
(1.1), high pressure steam generator (1.2) and high-pressure superheater (1.3)；The outlet of the oxygen-eliminating device (4) be connected with high pressure to
Water pump (6), the outlet of the high pressure feed pump (6) is with medium pressure economizer (1.4), the high-pressure economizer (1.1)
Connection.
16. combined cycle two-shipper condensing-back pressure formulas according to claim 15 are drawn gas cogeneration system, it is characterised in that
Medium voltage network pressure retaining valve (31) is provided with jet chimney between medium pressure superheater (1.6) and the reheater (1.7).
17. combined cycle two-shipper condensing-back pressure formulas according to claim 1 are drawn gas cogeneration system, it is characterised in that
Also include water charging system (7), the water charging system (7) be arranged in the oxygen-eliminating device (4) or the condenser (3) hot well
(8) on the outlet conduit of the inner or condenser (3).
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