CN106594699A - Low heating value coal gas electric power generation system - Google Patents
Low heating value coal gas electric power generation system Download PDFInfo
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- CN106594699A CN106594699A CN201611068562.5A CN201611068562A CN106594699A CN 106594699 A CN106594699 A CN 106594699A CN 201611068562 A CN201611068562 A CN 201611068562A CN 106594699 A CN106594699 A CN 106594699A
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- low
- steam
- drum
- superheater
- economizer
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
- F22G5/123—Water injection apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G7/00—Steam superheaters characterised by location, arrangement, or disposition
- F22G7/12—Steam superheaters characterised by location, arrangement, or disposition in flues
Abstract
The invention relates to coal gas electric power generation and provides a low heating value coal gas electric power generation system. The system comprises a coal gas boiler and a generator unit. The generator unit comprises a turbine and a generator. The coal gas boiler comprises a boiler body and a drum. The boiler body comprises a horizontal flue and a vertical flue. A water cooling wall is arranged on the boiler body, the water cooling wall communicates with a liquid outlet and a steam inlet of the drum, and an overheating unit and a coal saver unit are further arranged in the boiler body; the overheating unit communicates with a steam outlet of the drum and a high-pressure cylinder inlet of the turbine; the coal saver unit communicates with a dead steam outlet of the turbine and a liquid inlet of the drum. In the electric power generation system provided by the invention, a combustor stably combusts low heating value coal gas to heat liquid water on the water cooling wall into a steam state first, and then the overheating unit heats the steam into overheated steam, and the overheated steam acts to generate electricity, so that the steam water parameter can be stabilized; therefore, not only is the safety guaranteed, but also the electric power generating efficiency of the low heating value coal gas can be improved, and the heat utilization ratio is relatively high.
Description
Technical field
The present invention relates to coal gas generates electricity, more particularly to a kind of low-heat value gas electricity generation system.
Background technology
China's steel and iron industry fast development, has occupied the first in the world big producing country for years.Iron and steel enterprise was smelting
Substantial amounts of by-product gas, such as blast furnace gas, coal gas of converter and coke-stove gas are generated in journey.Coke-stove gas and coal gas of converter due to
Calorific capacity is high, can in production and life effectively utilizes.And blast furnace gas has, and yield is maximum, calorific value is minimum, it is stable to be difficult to
Burning, the low feature of generating efficiency.
Blast furnace gas is the mixed gas of a kind of colorless and odorless, odorless, and main component is CO, CO2、N2、H2、CH4Deng which
Middle combustible component CO contents account for 25%；H2、CH4Content seldom, little is affected on gross calorific power；Noble gases CO2、N2's
Content accounts for 15%, 55% (with volume fraction) respectively, and proportion is high, is both not involved in burning and produces heat, can not help
Combustion, conversely, the heat produced in also absorbing substantial amounts of combustion process；Flame is longer；About 700 DEG C of ignition temperature；Flame is passed
Broadcast speed very slow, temperature is not high, combustion stability is bad；Calorific value is generally 3100kJ/Nm3-4200kJ/Nm3, exhaust gas volumn is big.Cause
This, effective conversion and utilization of blast furnace gas are the important steps of iron and steel enterprise's clean manufacturing and energy-conservation.
Based on blast furnace gas fuel and combustion characteristics, blast furnace gas has aobvious with the solid of other high heating values or gaseous fuel
The difference of work, the heat-transfer character of gas boiler are varied widely, and its heating surface arrangement has dramatically different with coal burning gas boiler.
Although patent《A kind of Blast Furnace Gas-fired Boiler flue gas heat recovery system》(application number：201320444475.0) and
《A kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system》(application number：201320446384.0) disclose phase
Blast furnace gas boiler flue gas heat recovery system is closed, but, which only improves emphatically pick up the heat more than fume side, and not
The core such as gas boiler heat transfer that the features such as considering because the calorific value of blast furnace gas is low, be difficult to stable burning brings and heating surface arrangement
Major issue, does not consider how to improve low-heat value gas generating efficiency by soda pop side process optimization yet.
Meanwhile, there is desuperheating water usage amount at present considerably beyond design load in many blast furnace gas boilers in high load capacity, special
It is not to draw high in gas boiler load or in the case of high load capacity gas boiler load fluctuation, there is desuperheating water and do not catch up with, coal gas
The problem of the easy overtemperature of boiler superheater heating surface.For this reason, it may be necessary to reasonable Arrangement is carried out to all kinds of heating surfaces of blast furnace gas boiler,
Including heating surface arrangement form, heating surface arrangement ratio etc., so as to solve the problems, such as the easy overtemperature of gas boiler superheater surface,
Stable soda pop parameter, improves the overall thermal efficiency of low calorific value coal gas electric generating apparatus.
The content of the invention
It is an object of the invention to provide a kind of low-heat value gas electricity generation system, it is intended to for solving existing low calorific value coal
The relatively low problem of the thermal efficiency of gas.
What the present invention was realized in：
The embodiment of the present invention provides a kind of low-heat value gas electricity generation system, including gas boiler and generating set, described
Generating set is included the steam turbine being connected with the gas boiler pipeline and the electromotor of rotation, institute is ordered about by the steam turbine
State gas boiler include built-in combustion room body of heater and can steam-water separation drum, the body of heater includes positioned at the combustor
The horizontal flue and the vertical flue connected with the horizontal flue of top, is provided with water-cooling wall, the water on the body of heater
At least one port of cold wall is connected with the liquid outlet of the drum, and at least one port is connected with the gas entrance of the drum
It is logical, overheated unit and economizer unit are respectively arranged with the horizontal flue and the vertical flue, it is described overheated
Unit connects the gas outlet of the drum and the high pressure cylinder entrance of the steam turbine, and the economizer unit connects the vapour
The exhaust steam outlet of turbine and the liquid inlet of the drum, and on the pipeline between the economizer unit and the steam turbine
It is provided with condenser.
Further, reheater unit is additionally provided with the body of heater, the reheater unit connects the steam turbine
Low pressure (LP) cylinder entrance and the steam turbine high pressure cylinder outlet.
Further, the reheater unit includes installing the low-temperature reheater in the vertical flue, the steamer
The high pressure cylinder outlet of machine is to the low-temperature reheater.
Further, the reheater unit also includes installing the high temperature reheater in the horizontal flue, the height
Warm reheater connects the low pressure (LP) cylinder import of the low-temperature reheater and the steam turbine.
Further, the economizer unit includes installing in the main economizer of the vertical stack base and positioned at institute
The bypass economizer stated above main economizer and connect with the main economizer, the condensator outlet are communicated to main province's coal
Device, the bypass economizer are also communicated to the liquid inlet of the drum, and the bypass economizer and the low-temperature reheater
It is arranged side by side, is separated by superheater partition wall between the two.
Further, the vertical flue includes upper space and lower space, and the main economizer is located at the bottom
In space, bypass economizer and the low-temperature reheater are located in the upper space, and the upper space with it is described
Connected by expansion joint between lower space.
Further, the overheated unit includes pendant superheater component, the low temperature superheater of convection type and convection type
High temperature superheater, three is sequentially communicated, and pendant superheater component described in the gas outlet of the drum, the high temperature
Superheater connects the high pressure cylinder entrance of the steam turbine.
Further, the pendant superheater component include with the front screen superheater of the gas outlet of the drum with
And the front Late reworking for shielding superheater and the low temperature superheater is connected, and in the front screen superheater and the rear screen
One-level water spraying structure is provided with the stream of superheater.
Further, the high temperature superheater includes two cold section and a hot arc, and the hot arc is described cold positioned at two
Between section, and two grades of water spraying structures are provided with previous described cold section with the stream between the hot arc.
Further, the body of heater extends to form folding flame to the horizontal flue inner bending in the exit of the combustor
Angle, the furnace arch, furnace nose are included in the upward direction to the first tilting section of the tilted extension of the horizontal flue and by described
One tilting section is along acclivitous second tilting section in direction to the vertical flue.
The invention has the advantages that：
In the electricity generation system of the present invention, the burning that low-heat value gas is introduced into body of heater is indoor, and in the presence of burner
Its burning is made to release heat, the aqueous water in drum is directed in the water-cooling wall of body of heater by its liquid outlet, low-heat value gas combustion
Aqueous water in liberated heat heating water-cooling wall, and then cause the heat absorption of operative liquid water to be mutually changed into gaseous state, by water-cooling wall
Gas-vapor mix is imported again, wherein the liquid Jing liquid outlets after separating enter weight in water-cooling wall
It is new to heat, and steam is then heated to be superheated steam in overheated unit, can import superheated steam and be done in steam turbine
Work(generates electricity, and the condensed device of the exhaust steam after acting enters heat temperature raising in economizer unit after being condensed into aqueous water, and after heating up
Aqueous water imports drum interior circulation and utilizes.In above process, by burner stable burning low-heat value gas, first by water-cooling wall
Interior aqueous water is heated to be gaseous state, and steam is heated to be superheated steam using overheated unit then, is sent out using superheated steam acting
Electricity, can stablize soda pop parameter, both can ensure that safety, additionally it is possible to improve the generating efficiency of low-heat value gas, generating efficiency
Up to more than 37%, heat utilization ratio is higher.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of low-heat value gas electricity generation system provided in an embodiment of the present invention；
Schematic flow sheets of the Fig. 2 for the low-heat value gas electricity generation system of Fig. 1.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is all other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Referring to Fig. 1 and Fig. 2, the embodiment of the present invention a kind of low-heat value gas electricity generation system, including gas boiler 1 are provided with
And generating set 2, low-heat value gas can be imported and be burnt in gas boiler 1, then using low-heat value gas combustion generation
Heat generated electricity by generating set 2, generating set 2 includes steam turbine 21 and electromotor 22, and steam turbine 21 includes high pressure
Cylinder 211, it is steam that low-heat value gas can heat aqueous water in the heat that 1 interior burning of gas boiler is produced, and then will can be steamed
Steam turbine 21 is ordered about in vapour importing high pressure cylinder 211 to do work, 22 rotary electrification of electromotor is driven by steam turbine 21 then, and steam is done
Work(becomes exhaust steam and is exported by exhaust steam and derive recycling.The structure of refinement gas boiler 1, which includes built-in combustion room 111
Body of heater 11 and can steam-water separation drum 12, burner 112 is provided with combustor 111, low-heat value gas imports burning
Releasing heat is lighted by burner 112 in room 111, typically, in combustor 111, multiple burners 112 is provided with, can be by combustion
112 support layered arrangement of burner can be provided with two-layer on front wall on the front-back wall of combustor 111, such as, and rear wall is arranged
There is one layer, and each layer is sequentially arranged at intervals with three burners 112, can cause to enter combustor by this arrangement
Low-heat value gas in 111 can burn completely, can be using coke-stove gas as seed material, high energy point in combustor 111
Firelock is provided with high-energy firing gun and coke oven air gun, first passes through high-energy firing gun and light as lighter, every burner 112
Coke-stove gas lights low-heat value gas with the corresponding burner 112 that ignites, then by burner 112, and upper strata burner 112 can not make
With igniter, layer burner 112 ignites on the lower, and each burner 112 adopts double-cyclone version in addition, it is possible to achieve
Burning to low-heat value gas, of course for combustion completion is ensured, leaves flame detecting device use on every 112 support of burner
Hole, for configuring fiery inspection equipment, to ensure the safety of gas boiler 1 in combustion process；And drum 12 is located at the outside of body of heater 11,
Which can realize steam-water separation effect, using single hop vapo(u)rization system, be provided with drum 12 cyclone separator, cleaning orifice,
The equipment such as top wave form plate separator and top porous plate, after steam water interface is imported in drum 12, by above-mentioned each point
The steam in steam water interface and aqueous can be sufficiently separated from equipment, and steam is filled in the upper space of drum 12, aqueous
Then in the lower space of drum 12,2 bi- colour water gauges, 2 electric contact water gauges, 3 single chambers on drum 12, are provided with
Water level balance container, for ensureing that steam quality is good and can process 12 full water phenomenon of drum in time, generally in drum 12
Phosphate chemical feed pipe, continuous blowdown pipe and emergency blowoff pipe are also equipped with, for ensureing water quality.Continue refinement 11 structure of body of heater, its
Agent structure is using double framework all steel welding, and inner space also includes horizontal flue 113 and vertical flue 114, level
Flue 113 is located at the top of combustor 111, its connection combustor 111 and vertical flue 114, and combustor 111 and vertical flue
114 are oppositely arranged, and three encloses to form π types, the flue gas produced after low-heat value gas combustion Jing combustor 111, horizontal cigarette successively
Road 113 and the vertically discharge of flue 114 gas boiler 1, are needed to do further purification by the flue gas that gas boiler 1 is discharged certainly
Reason heel row is provided with full fin panel casing 115, while there also is provided roof tube and enclosure wall tube, drum on body of heater 11 to air
In 12, detached steam is introduced in roof tube and enclosure wall tube, then is allocated to follow-up overheated unit 13, roof tube and bag
Wall coil adds the membrane wall structure of band steel, water-cooling wall 115 to have the liquid outlet of at least one port and drum 12 using light pipe
Connection, usual water-cooling wall 115 have multiple ports and the liquid outlet of drum 12 to connect, and the aqueous in drum 12 can be corresponding with Jing
Pipeline is entered in water-cooling wall 115, and also there is water-cooling wall 115 at least one port to be connected with the gas entrance of drum 12, water-cooled
Wall 115 adds band steel to be welded into from using light pipe, and wall with refractory lining, refracto is covered with water-cooling wall 115, the weight of the water-cooling wall 115 of body of heater 11
It is suspended on roof beam lattice by upper collecting chamber suspension rod, tiltedly rear water-cooling wall 115 is suspended to by the fairlead through horizontal flue 113
Top steelframe on, whole body of heater 11 is expanded after being heated downwardly together, and in 115 outside surrounding of water-cooling wall along short transverse every 3m
Left and right arranges one and encloses buckstay, to increase the rigidity of water-cooling wall 115, meets the requirement of 111 design pressure of combustor.Further
Ground, is respectively arranged with overheated unit 13 and economizer unit 14, both of which in horizontal flue 113 and vertically flue 114
On the flue that low-heat value gas combustion produces flue gas, wherein the gas outlet of the connection drum 12 of overheated unit 13 and steamer
211 entrance of high pressure cylinder of machine 21, in drum 12, detached steam is introduced in above-mentioned roof tube, and which part steam enters bag
Heating in wall coil, the steam after heating are heated to be superheated steam again in the overheated unit 13, then by the superheated steam
Acting in steam turbine 21 is imported, and the liquid of the exhaust steam outlet and drum 12 that economizer unit 14 then connects steam turbine 21 enters
Mouthful, and condenser 23 is provided with the pipeline between economizer unit 14 and steam turbine 21, produce after low-heat value gas combustion
Raw flue gas along horizontal flue 113 flow at economizer unit 14 with vertical flue 114 when, its also have higher temperature,
And superheated steam becomes exhaust steam after acting in steam turbine 21 and discharged by exhaust steam outlet, and condensed device 23 liquefies to lead after aqueous
Enter in economizer unit 14, and then can heat by 14 pairs of part aqueous of economizer unit, the aqueous after heating are led
Enter the utilization of 12 interior circulation of drum.
In the present invention, low-heat value gas is imported in the combustor 111 of body of heater 11, is lighted by burner 112, together
When drum 12 in aqueous Jing its liquid outlets flow in water-cooling wall 115, due to low-heat value gas produce in burning flue gas and
With the release of substantial amounts of heat, the aqueous in water-cooling wall 115 can be heated by the partial heat, and then cause part
Aqueous are mutually changed into steam, and then the steam water interface is imported again in drum 12 carries out vapor-liquid separation, generally in body of heater 11
Evaporation convection tube panel 116 is additionally provided with, which is spiral finned tube, is fixed on by the way of hanging on the steelframe of top, the evaporation
116 two ends of convection current tube panel are respectively communicated with the liquid outlet and gas entrance of drum 12, and the aqueous in this drum 12 are being directed at
Being split being partially in evaporation convection tube panel 116 during water-cooling wall 115 carries out being heated to be steam, evaporation convection tube panel
Steam water interface in 116 is also directed into carrying out vapor-liquid separation in drum 12, and aqueous after isolation continue to be conducted to water-cooled
Heated in wall 115 or evaporation convection tube panel 116 again, the steam after separation is then conducted in overheated unit 13 also by again
Secondary heating, and then steam can be caused to be heated to be superheated steam, superheated steam can then can be conducted to enter in steam turbine 21
Row acting generates electricity, and the superheated steam after acting is generated as exhaust steam is derived by the exhaust steam outlet of steam turbine 21, and exhaust steam enters condenser
Liquefaction in 23 is for about 40 DEG C of aqueous, is driven into low-pressure heater 25 by condensate pump 24 afterwards, the quilt in low-pressure heater 25
The low-pressure pumping steam heating of steam turbine, and enter in oxygen-eliminating device 26 from the aqueous out of low-pressure heater 25, carried out by oxygen-eliminating device 26
After deoxygenation, by 27 suction high-pressure heater 28 of feed pump, heated by the high pressure extraction of steam turbine in high-pressure heater 28, then
It is conducted into being heated again in economizer unit 14, the aqueous after heating are imported and circulated according to above-mentioned steps successively in drum 12
Use.In above-mentioned whole process, the burner 112 adopted in this way lights low-heat value gas, can cause low calorific value coal
Gas stably burns in combustor 111, and after low-heat value gas is lighted in burned device 112, the heat of its release is first heated
Aqueous in water-cooling wall 115 or evaporation convection tube panel 116, then at overheated unit 13 can heat steam, finally may be used also
With the aqueous after heating acting at economizer unit 14, heat is repeatedly utilized, and low-heat value gas in whole process
Heat is respectively positioned in body of heater 11, it is not easy to is scattered and disappeared, the overall thermal efficiency of electricity generation system can be effectively ensured, enhances soda pop and changes
Heat.
Optimization above-described embodiment, is additionally provided with reheater unit 15 in body of heater 11, and the reheater unit 15 connects steamer
212 entrance of low pressure (LP) cylinder of machine 21 and the high pressure cylinder 211 of steam turbine 21 are exported.In the present embodiment, general steam turbine 21 also includes
There is low pressure (LP) cylinder 212, superheated steam is generated electricity by acting after the importing of 211 entrance of high pressure cylinder, and the steam after its acting can be by high pressure cylinder 211
Outlet is derived, and the red switch acting in the high pressure cylinder 211 due to superheated steam, by high pressure cylinder 211 export the steam pressure of discharge with
Temperature is reduced, and this can be conducted into be heated again in reheater unit 15 for superheated steam, and superheated steam can be led
Enter to carry out the acting of red switch again in low pressure (LP) cylinder 212, vapor (steam) temperature and pressure are lowered again, can be described as exhaust steam, and exhaust steam is then by weary
It is aqueous that vapor outlet imports liquefaction in condenser 23.In this regard, the profit of superheated steam can be improved by setting up reheater unit 15
With rate, it is ensured that the overall thermal efficiency of the low-heat value gas to electricity generation system.
The structure of refinement reheater unit 15, which includes installing the low-temperature reheater 151 in vertical flue 114, steamer
211 outlet of high pressure cylinder of machine 21 is to the low-temperature reheater 151.Low-temperature reheater 151 is also adopted by the structure of spiral finned tube
Form, and in-line counter-flow arrangement, in steam turbine 21, steam enters entering for low-temperature reheater 151 after being exported by high pressure cylinder 211 and being discharged
Mouth header, can be provided with attemperator at the import header, i.e. the steam of the discharge of high pressure cylinder 211 is introduced into low-temperature reheater
Homoiothermic is carried out by attemperator in 151 import header, and the attemperator mainly adopts watering temperature adjustment, finely tune vapor (steam) temperature,
Steam after desuperheat is heated in low-temperature reheater 151.Generally reheater unit 15 also includes high temperature reheater
152, high temperature reheater 152 is installed in horizontal flue 113, and which connects low-temperature reheater 151 and 212 import of low pressure (LP) cylinder, due to
Horizontal flue 113 is located at vertical flue 114 along the front of flue gas flow direction, then the temperature at horizontal flue 113 is higher than vertical flue
Temperature at 114, the steam discharged by high pressure cylinder 211 are introduced into low-temperature reheater 151 and heat, and are then introduced into high temperature reheater
152 heating, and Jing high temperature reheater 152 heat after steam be superheated steam, the low pressure (LP) cylinder that can be conducted in steam turbine 21
Red switch acting in 212.High temperature reheater 152 adopts light-pipe structure, and is in-line down current arrangement, the row with low-temperature reheater 151
Column direction is conversely, heat absorption efficiency can be improved.Flue regulation is carried out at 11 corresponding reheater unit 15 of body of heater in addition, body of heater 11
Vertically twin flue design is carried out in flue 114, then the end-position in twin flue is provided with gas baffle 161, by adjusting
The aperture of gas baffle 161 is realizing the distribution of exhaust gas volumn in two flues, and then can reach and adjusted by reheater unit 15
The purpose of section reheat steam temperature, so that the temperature of reheated steam is highly stable with pressure.
Further, the structure of economizer unit 14 is refined, which includes installing in the main economizer of 114 bottom of vertical flue
141 and the bypass economizer 142 above main economizer 141, connect between the two, bypass economizer 142 can be two
Individual, both are in parallel, and main economizer 141 is connected with two bypass economizers 142 respectively by two streams, the outlet of condenser 23
Main economizer 141 is communicated to, and the wherein Single port for bypassing economizer 142 is communicated to the liquid inlet of drum 12, and bypass province
Both coal device 142 and low-temperature reheater 151 are arranged side by side, and respectively in the twin flue of vertical flue 114, and lead between the two
Cross superheater partition wall 16 to be separated, generally adopt film partition structure, some vapor into roof tube enter the mistake
Heating in hot device partition wall 16, the steam after heating can be entered and be heated again in overheated unit 13 for superheated steam, and by upper
161 liang of flue gas flows adjusted between bypass economizer 142 and 151 corresponding flue of low-temperature reheater of the gas baffle stated, main province
Coal device 141 is located at the lower section of twin flue end.In the present embodiment, flue gas is along direction of the bypass economizer 142 to main economizer 141
Flowing, and the aqueous that condenser 23 is discharged then flow to bypass economizer 142 by main economizer 141, so as to realize working medium and cigarette
Between gas each other countercurrently, main economizer 141 is helix fin tubular construction with bypass economizer 142, wherein main economizer 141 is
It is staggered in arrangement, and it is in-line arrangement to bypass economizer 142, bypass economizer 142 adopts overhung construction, and total weight is by hanging
Device is fixed on enclosure wall tube, then is suspended on the steelframe of top by enclosure wall tube header fairlead, and main economizer 141 is put on ventilation
Liang Shang, ventilation beam pass body of heater 11 and are bearing on 11 backplate of body of heater.In addition operationally, entered by the aqueous that feed pump 27 is provided
Become owner of after heating in economizer 141, as needed a portion aqueous directly can be directed in drum 12 as rinse water
Use.
Optimization above-described embodiment, by vertical flue, 114 points is upper space and lower space, wherein 141, main economizer
In lower space, and bypass economizer 142 and be located in upper space with low-temperature reheater 151, and upper space is empty with bottom
Between between then connected by expansion joint 117.In the present embodiment, vertical flue 114 is divided into by above-mentioned twin flue and single flue
Upper space and lower space, i.e. twin flue correspondence upper space, and main economizer 141 is located at the lower section of twin flue, is single cigarette
Road, correspondence lower space, is connected using nonmetallic expansion joint 117 with the junction of single flue in twin flue to this, and which can be with
Expansion is absorbed, leakage is reduced.
Further, the structure of overheated unit 13, including the cryogenic overheating of pendant superheater component 131, convection type are refined
The high temperature superheater 133 of device 132 and convection type, three is sequentially communicated, i.e., steam sequentially pass through pendant superheater component 131,
Low temperature superheater 132 and high temperature superheater 133, and the gas outlet pendant superheater component 131 of drum 12, high temperature mistake
Hot device 133 connects 211 entrance of high pressure cylinder of steam turbine 21.In the present embodiment, pendant superheater component 131 is that half radiant type is overheated
Device, and low temperature superheater 132 is convection superheater with high temperature superheater 133, i.e., the overheated unit 13 that the present invention is provided is adopted
The mode combined with convection current with radiation, multiple cross-mixing, during setting, pendant superheater component 131 is located at combustor 111
Surface, the high-temperature flue gas produced after low-heat value gas combustion are first flow at pendant superheater component 131, high temperature superheater 133
Then set gradually along the flow direction of flue gas with low temperature superheater 132, added by the steam heated in enclosure wall tube is interior with superheater partition wall 16
The steam of heat is imported in pendant superheater component 131, and Jing after pendant superheater component 131 is heated enters low temperature superheater
Heating in 132, finally enters heating in high temperature superheater 133, and then can obtain superheated steam for rushing in steam turbine 21
Turn acting.By the overheated unit 13 for arranging this structure, the heat absorption ratio of three kinds of superheaters can be caused to be respectively：Screen formula is overheated
Than being 6%～7%, the heat absorption ratio of high temperature superheater 133 is 9.5%～10.5% to the heat absorption of device assembly 131, and low temperature superheater 132 is inhaled
Heat stabilizes soda pop ginseng than being 9.0%～10.5% so as to solve the problems, such as the easy overtemperature of 1 superheater surface of gas boiler
Number, especially makes gas boiler 1 when load draws high or high load capacity fluctuates, stabilizes soda pop parameter, not only ensure that coal gas pot
Stove 1 safety, it is to avoid the risk of the easy booster of superheater, and improve the overall thermal efficiency of low-heat value gas electricity generation system.One
As, body of heater 11 is formed with furnace arch, furnace nose 118, furnace arch, furnace nose 118 to 113 inner bending of horizontal flue extension in the exit of combustor 111
Including the first tilting section and the second tilting section, wherein the first tilting section is in the upward direction to 113 tilted extension of horizontal flue,
And the second tilting section is inclined upwardly extension from the first tilting section to the direction of vertical flue 114, such that it is able to pass through first
Tilting section forms the bore for first reducing combustor 111 to horizontal flue 113, then causes horizontal flue by the second tilting section
113 bore is in gradually-reducing shape along the flow direction of flue gas, and which can be effectively improved the aerodynamic field in horizontal flue 113.Above-mentioned
Pendant superheater component 131 shields superheater 134 and Late reworking 135 before including, both of which is located at 113 correspondence of horizontal flue
In the space of furnace arch, furnace nose 118, the gas outlet of front screen superheater 134 and drum 12, specifically with the outlet of enclosure wall tube with
And the outlet of superheater partition wall 16 so that the steam in both shields in superheater 134 before can flowing to, and Late reworking
Screen superheater 134 and low temperature superheater 132 before 135 connections, in front screen superheater 134, the steam of heating shields overheated after being introduced into
In device 135, heating, enters back in low temperature superheater 132.Front screen superheater 134, Late reworking 135, low temperature superheater 132 with
And high temperature superheater 133 is suspended on the steelframe of top by suspension rod, and made using 12Cr1MoVG materials, which part steel
Duan Ze grinds 102 steel alloys using steel.
Further, steam temperature adjustment structure is additionally provided with overheated unit 13, such as in front screen superheater 134 and rear screen mistake
One-level water spraying structure is provided with stream between hot device 135, one-level water spraying structure is using direct-contact desuperheater to front screen superheater
Steam spray cooling in stream between 134 and Late reworking 135, this is coarse adjustment, can tentatively adjust the temperature of steam.
Steam temperature adjustment structure also includes two grades of water spraying structures, and which is installed on high temperature superheater 133, and high temperature superheater 133 includes two
Individual cold section and a hot arc, between hot arc is located at two cold section, can be provided with the previous cold section of stream and hot arc between
Two grades of water spraying structures, are adjusted to accurate adjustment herein, can be provided with regulating valve and stop valve, it is possible to achieve in stream on stream
The relative accurate adjustment of vapor (steam) temperature.The common adjustment effect of one-level water spraying structure and two grades of water spraying structures is passed through to this, can be with
Ensure the temperature of the superheated steam under 1 rated load of gas boiler, water is used for one-level water spraying structure and two grades of water spraying structures
Aqueous after the deoxygenation of the extraction of feed pump 27 can be adopted.Also set up on stream generally between overheated unit 13 and steam turbine 21
There is a steam header 136, the superheated steam after being heated by high temperature superheater 133 is introduced in the steam header 136 and is delayed
Punching, is then directed to red switch acting in the high pressure cylinder 211 of steam turbine 21.
Further, an air preheater 17 is additionally provided with the bottom of vertical flue 114, mend into combustor 111
The air for filling is introduced into air preheater 17, and the flue gas in vertical flue 114 is flow at air preheater 17 can be into which
Air is heated, and improves the utilization rate of flue gas heat, and certain flue gas is not mixed with the air in air preheater 17, Liang Zhewei
Non-contact thermal.Air preheater 17 adopts vertical channel structure, single-stage one-stroke to arrange, the pipe of air preheater 17 is thin
Wall spiral grooved tube, parallel baffled in fume pipe, the outer transversal flow of air hose, to prevent the vibrations of air preheater 17, in bobbin carriage
In be equipped with shock baffle.
Referring to Fig. 1 and Fig. 2, in sum, can be by after low-heat value gas combustion using the electricity generation system of said structure
The Btu utilization acting of generation generates electricity, and concrete operation step is as follows：
Low-heat value gas is sent in the combustor 111 of gas boiler 1 by gas piping Jing Dual-cyclones burner 112
Row burning, burning produce heat, heat each heating surface；
Aqueous in drum 12 are flowed out by liquid outlet, and form two streams, wherein a stream is sent into by pipeline
The water-cooling wall 115 of body of heater 11, another stream send into evaporation convection tube panel 116 by pipeline, and aqueous are right in water-cooling wall 115 and evaporation
Flow tube screen 116 is heated, and is mutually changed into steam water interface, sends drum 12 back to by pipeline；
Steam water interface carries out steam-water separation in drum 12, and the saturated vapor separated delivers to ceiling by pipeline
Pipe, steam is divided into four tunnels in the roof tube, and wherein two-way (front left side bag and front right side bag) enters enclosure wall tube after being heated, separately
Outer two-way (left side bag and rear right side bag afterwards) enters superheater partition wall 16 after being heated, from enclosure wall tube and superheater partition wall 16 out
Steam together enter front screen superheater 134；
Late reworking 135, front screen superheater 134 and Late reworking 135 are entered after front screen superheater 134 is heated
Between by one-level water spraying structure adjust steam temperature, Late reworking 135 be heated after, into low temperature superheater 132
Heating, is heated into high temperature superheater 133 afterwards, and cold section in high temperature superheater 133 is sprayed water by two grades and hot arc between
Structure homoiothermic again, the superheated steam after two grades of watering temperature adjustments enter steam header 136；
Superheated steam delivers to 21 high pressure cylinder 211 of steam turbine, steam red switch vapour by pipeline after collection vapour header enters row buffering
21 blade of turbine, steam turbine 21 drive electromotor 22 to be generated electricity, vapor (steam) temperature and reduced pressure after red switch acting；
Low-temperature reheater 151 is entered from the steam out of high pressure cylinder 211, is added into high temperature reheater 152 again afterwards
Heat is superheated steam, and the superheated steam is imported 21 low pressure (LP) cylinder 212 of steam turbine, and after red switch acting, vapor (steam) temperature and pressure are again
Secondary reduction；
Condensed into condenser 23 from the exhaust steam out of 21 low pressure (LP) cylinder 212 of steam turbine, be condensed in condenser 23
For about 40 DEG C of aqueous, are driven into low-pressure heater 25 by condensate pump 24 afterwards, by steam turbine in low-pressure heater 25
Low-pressure pumping steam is heated；
Oxygen-eliminating device 26 is entered from the water out of low-pressure heater 25, after oxygen-eliminating device 26 carries out deoxygenation, by feed pump 27
High-pressure heater 28 is squeezed into, is heated by the high pressure extraction of steam turbine in high-pressure heater 28, afterwards into main economizer 141；
Aqueous enter bypass economizer 142 after main economizer 141 is by the flue gas of 114 afterbody of vertical flue, are entered
Enter after the heating of one step and be recycled in drum 12, the aqueous being repeated in above steps and steam step.It is main in addition
The outlet of economizer 141 is additionally provided with a branch road, delivers to drum 12 as rinse water when being necessary, for the clear of drum 12
Wash.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (10)
1. a kind of low-heat value gas electricity generation system, including gas boiler and generating set, the generating set include with it is described
The steam turbine of gas boiler pipeline connection and the electromotor of rotation is ordered about by the steam turbine, it is characterised in that：The coal gas
Boiler include the body of heater of built-in combustion room and can steam-water separation drum, the body of heater includes above the combustor
Horizontal flue and the vertical flue connected with the horizontal flue, are provided with water-cooling wall on the body of heater, the water-cooling wall is extremely
Few a port is connected with the liquid outlet of the drum, and at least one port is connected with the gas entrance of the drum, in institute
State and in horizontal flue and the vertical flue, be respectively arranged with overheated unit and economizer unit, the overheated unit connection
The gas outlet of the drum and the high pressure cylinder entrance of the steam turbine, the economizer unit connect the weary of the steam turbine
The liquid inlet of vapor outlet and the drum, and be provided with the pipeline between the economizer unit and the steam turbine cold
Condenser.
2. low-heat value gas electricity generation system as claimed in claim 1, it is characterised in that：Reheating is additionally provided with the body of heater
Device unit, the reheater unit connect the high pressure cylinder outlet of the low pressure (LP) cylinder entrance of the steam turbine and the steam turbine.
3. low-heat value gas electricity generation system as claimed in claim 2, it is characterised in that：The reheater unit include installing in
Low-temperature reheater in the vertical flue, the high pressure cylinder outlet of the steam turbine is to the low-temperature reheater.
4. low-heat value gas electricity generation system as claimed in claim 3, it is characterised in that：The reheater unit also includes installing
High temperature reheater in the horizontal flue, it is low with the steam turbine that the high temperature reheater connects the low-temperature reheater
Cylinder pressure import.
5. low-heat value gas electricity generation system as claimed in claim 3, it is characterised in that：The economizer unit include installing in
The main economizer of the vertical stack base and the bypass connected above the main economizer and with the main economizer
Economizer, the condensator outlet are communicated to the main economizer, and the bypass economizer is also communicated to the liquid of the drum
Entrance, and it is described bypass economizer be arranged side by side with the low-temperature reheater, separated by superheater partition wall between the two.
6. low-heat value gas electricity generation system as claimed in claim 5, it is characterised in that：The vertical flue includes upper space
With lower space, in the lower space, the bypass economizer is located at the main economizer with the low-temperature reheater
In the upper space, and connected by expansion joint between the upper space and the lower space.
7. low-heat value gas electricity generation system as claimed in claim 1, it is characterised in that：The overheated unit includes that screen formula is overheated
The high temperature superheater of device assembly, the low temperature superheater of convection type and convection type, three are sequentially communicated, and the gas of the drum
Pendant superheater component described in outlet, the high temperature superheater connect the high pressure cylinder entrance of the steam turbine.
8. low-heat value gas electricity generation system as claimed in claim 7, it is characterised in that：The pendant superheater component include with
The front screen superheater of the gas outlet of the drum and connect it is described before after screen superheater and the low temperature superheater
Screen superheater, and one-level water spraying structure is provided with stream of the front screen superheater with the Late reworking.
9. low-heat value gas electricity generation system as claimed in claim 7, it is characterised in that：The high temperature superheater include two it is cold
Duan Yuyi hot arc, the hot arc between two described cold section, and in previous described cold section with the stream between the hot arc
Two grades of water spraying structures are provided with road.
10. low-heat value gas electricity generation system as claimed in claim 1, it is characterised in that：The body of heater is in the combustor
Exit extends to form furnace arch, furnace nose to the horizontal flue inner bending, and the furnace arch, furnace nose is included in the upward direction to the level
First tilting section of the tilted extension of flue and from first tilting section along being inclined upwardly to the direction of the vertical flue
The second tilting section.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611068562.5A CN106594699B (en) | 2016-11-29 | 2016-11-29 | Low-heat value gas electricity generation system |
| RU2018144999A RU2717181C1 (en) | 2016-11-29 | 2017-11-27 | Electric power generation system and method of power generation from coal gas with low calorific value |
| PCT/CN2017/113100 WO2018099345A1 (en) | 2016-11-29 | 2017-11-27 | Low calorific value coal gas power generation system and power generation method |
| MYPI2018002300A MY190688A (en) | 2016-11-29 | 2017-11-27 | Low calorific value coal gas power generation system and power generation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611068562.5A CN106594699B (en) | 2016-11-29 | 2016-11-29 | Low-heat value gas electricity generation system |
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| CN106594699A true CN106594699A (en) | 2017-04-26 |
| CN106594699B CN106594699B (en) | 2019-10-22 |
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| CN201611068562.5A Active CN106594699B (en) | 2016-11-29 | 2016-11-29 | Low-heat value gas electricity generation system |
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| WO2018099345A1 (en) * | 2016-11-29 | 2018-06-07 | 武汉都市环保工程技术股份有限公司 | Low calorific value coal gas power generation system and power generation method |
| CN110822458A (en) * | 2019-10-21 | 2020-02-21 | 山西大学 | Low-concentration gas steady-state catalytic oxidation device for waste heat step utilization |
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