CN206369199U - Low-heat value gas HTHP electricity generation system - Google Patents

Abstract

The utility model is related to coal gas generating, a kind of low-heat value gas HTHP electricity generation system is provided, including gas boiler and generating set, generating set includes steam turbine and generator, gas boiler includes body of heater and drum, in the overheat unit that the superheated steam that can be thermally formed 9.8MPa/540 DEG C is provided with horizontal flue, overheat the gas outlet of unit connection drum and the high pressure cylinder entrance of steam turbine, and overheat unit includes heat absorption than the pendant superheater component for 5.2%~6.1%, the high temperature superheater that the low temperature superheater and heat absorption ratio that heat absorption ratio is 8.2%~9.7% are 8.9%~9.5%, three is sequentially communicated.In the utility model, pass through burner stable burning low-heat value gas, the aqueous water in water-cooling wall is first heated to be steam state, then steam is heated to be by superheated steam using overheat unit, done work and generated electricity using superheated steam, carbonated drink parameter can be stablized, can both ensure security, the generating efficiency of low-heat value gas can also be improved, heat utilization ratio is higher.

Description

Low-heat value gas HTHP electricity generation system

Technical field

The utility model is related to coal gas generating, more particularly to a kind of low-heat value gas HTHP electricity generation system.

Background technology

China's steel and iron industry fast development, occupies the first in the world big producer 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 effectively be utilized in production and life.And blast furnace gas has yield maximum, calorific value is minimum, be difficult to stabilization 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 it Middle combustible component CO contents account for 25%；H₂、CH₄Content seldom, little is influenceed on gross calorific power；Inert gas 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, on the contrary, also absorbing the heat produced in substantial amounts of combustion process；Flame is longer；Ignition temperature is about 700 DEG C；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, the 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, the solid or gaseous fuel of blast furnace gas and other high heating values have aobvious The difference of work, the heat-transfer character of gas boiler is 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, still, it only improves emphatically the recycling of fume side waste heat, and not Consider the cores such as the gas boiler brought because the calorific value of blast furnace gas is low, be difficult to the features such as stabilization is burnt is conducted heat and heating surface is arranged Major issue, does not consider how to improve low-heat value gas generating efficiency by carbonated drink side process optimization yet.

Meanwhile, at present there is desuperheating water usage amount in high load capacity considerably beyond design load in many blast furnace gas boilers, special It is not to be drawn 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 boiler superheater heating surface easy overtemperature.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 that the problem of solving gas boiler superheater surface easy overtemperature, Stable carbonated drink parameter, improves the overall thermal efficiency of low calorific value coal gas electric generating apparatus.

Utility model content

The purpose of this utility model is to provide a kind of low-heat value gas HTHP electricity generation system, it is intended to existing for solving The problem of thermal efficiency of some low-heat value gas is relatively low.

What the utility model was realized in：

The utility model embodiment provides a kind of low-heat value gas HTHP electricity generation system, including gas boiler and hair Group of motors, the generating set includes the steam turbine being connected with the gas boiler pipeline and drives rotation by the steam turbine Generator, the body of heater of the gas boiler including built-in combustion room and can steam-water separation drum, the body of heater includes position Water is provided with horizontal flue above the combustion chamber and the vertical flue connected with the horizontal flue, the body of heater Cold wall, at least one port of the water-cooling wall is connected with the liquid outlet of the drum, at least one port and the drum Gas entrance is connected, in the overheated machine that the superheated steam that can be thermally formed 9.8MPa/540 DEG C is provided with the horizontal flue Group, the overheat unit connects gas outlet and the high pressure cylinder entrance of the steam turbine of the drum, and the overheated machine The convection type low-temp mistake that group includes the pendant superheater component that heat absorption ratio is 5.2%~6.1%, heat absorption ratio is 8.2%~9.7% Hot device and heat absorption are than the convection type high temperature superheater for 8.9%~9.5%, and three is sequentially communicated, and the gas of the drum Pendant superheater component described in outlet, the high temperature superheater connects the high pressure cylinder entrance of the steam turbine.

Further, the pendant superheater component include with the preceding screen superheater of the gas outlet of the drum with And the Late reworking of the preceding screen superheater and the low temperature superheater is connected, and in the preceding 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 in being provided with two grades of water spraying structures on the previous cold section of stream between the hot arc.

Further, in being additionally provided with reheater unit in 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 in 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 in 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, in being provided with economizer unit in the vertical flue, the economizer unit includes installing in institute The bypass stated the main economizer of vertical stack base and connected above the main economizer and with the main economizer is saved Coal device, the main economizer is connected with the exhaust steam outlet of the steam turbine by condenser, and the bypass economizer is also communicated to The liquid inlet of the drum, and it is described bypass economizer be arranged side by side with the low-temperature reheater, between the two pass through overheat Device partition wall separates.

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 between lower space by expansion joint.

Further, it is additionally provided with the air preheater with the combustion chamber in the bottom of the vertical flue.

Further, the body of heater extends to form folding flame in the exit of the combustion chamber to the horizontal flue inner bending Angle, the furnace arch, furnace nose is included in the upward direction to the first tilting section of the tilted extension of the horizontal flue and by described the One tilting section along to the vertical flue acclivitous second tilting section in direction.

The utility model has the advantages that：

In electricity generation system of the present utility model, low-heat value gas is introduced into the combustion chamber of body of heater, and in the work of burner The aqueous water for making its burning release in heat, drum under is directed in the water-cooling wall of body of heater by its liquid outlet, low-heat value gas The aqueous water burnt 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 Interior gas-vapor mix is imported again carries out steam separation in drum, wherein the liquid after separation enters water-cooling wall through liquid outlet Inside reheat, and steam then enters the superheated steam for being heated to be 9.8MPa/540 DEG C of state in overheat unit, will can overheat Steam, which is imported, carries out acting generating in steam turbine.In above process, by burner stable burning low-heat value gas, first by water Aqueous water in cold wall is heated to be gaseous state, and steam then is heated to be into superheated steam using overheat unit, done using superheated steam Work(generates electricity, and can stablize carbonated drink parameter, can both ensure security, additionally it is possible to improve the generating efficiency of low-heat value gas, heat Utilization rate is higher.

Brief description of the drawings

, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art Or the accompanying drawing used required in description of the prior art is briefly described, it should be apparent that, drawings in the following description are only It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work Under, other accompanying drawings can also be obtained according to these accompanying drawings.

The structural representation for the low-heat value gas HTHP electricity generation system that Fig. 1 provides for the utility model embodiment；

Fig. 2 is the schematic flow sheet of Fig. 1 low-heat value gas HTHP electricity generation system.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The all other embodiment obtained, belongs to the scope of the utility model protection.

Referring to Fig. 1 and Fig. 2, the utility model embodiment provides a kind of low-heat value gas HTHP electricity generation system, bag Gas boiler 1 and generating set 2 are included, low-heat value gas can be imported to be burnt in gas boiler 1, then utilizes low heat value The heat that gas-fired is produced is generated electricity by generating set 2, and generating set 2 includes steam turbine 21 and generator 22, steamer Machine 21 includes high pressure cylinder 211, and the low-heat value gas heat that burning is produced in gas boiler 1 can heat aqueous water for steam, And then in steam importing high pressure cylinder 211 steam turbine 21 can will be driven to do work, then drive generator 22 to rotate by steam turbine 21 Generate electricity, and steam acting is exported by exhaust steam as exhaust steam and exports recycling.The structure of gas boiler 1 is refined, it includes interior Put combustion chamber 111 body of heater 11 and can steam-water separation drum 12, burner 112, low heat value are provided with combustion chamber 111 Coal gas imports in combustion chamber 111 and lights releasing heat by burner 112, typically, multiple burners is provided with combustion chamber 111 112, it can be such as provided with by the support layered arrangement of burner 112 on the front-back wall of combustion chamber 111 on front wall Two layers, rear wall is provided with one layer, and each layer is sequentially arranged at intervals with three burners 112, can be made by this arrangement The low-heat value gas that must enter in combustion chamber 111 can be burnt completely, and igniting can be used as using coke-stove gas in combustion chamber 111 Material, high-energy firing gun is provided with high-energy firing gun and coke oven air gun, first passes through height as igniter, every burner 112 Energy burning torch lights coke-stove gas with the corresponding burner 112 that ignites, then lights low-heat value gas, upper strata combustion by burner 112 Burner 112 can be without using igniter, and layer burner 112 ignites on the lower, and each burner 112 uses bispin flow structure in addition Form, it is possible to achieve the burning to low-heat value gas, of course for guarantee combustion completion, leaves on every support of burner 112 Flame detecting device hole, for configuring fire inspection equipment, to ensure the safety of gas boiler 1 in combustion process；And drum 12 In the outside of body of heater 11, it can realize steam-water separation effect, using single hop vapo(u)rization system, and whirlwind point is provided with drum 12 From equipment such as device, cleaning orifice, top wave form plate separator and top porous plates, imported when by steam water interface in drum 12 Afterwards, the steam and aqueous in steam water interface can be sufficiently separated by above-mentioned each separation equipment, and steam is filled in drum 12 Upper space, aqueous then positioned at drum 12 lower space in, 2 bi- colour water gauges, 2 electric contacts are provided with drum 12 Water gage, 3 single chamber water level balance containers, for ensureing that steam quality is good and can handle the full water phenomenon of drum 12 in time, Phosphate chemical feed pipe, continuous blowdown pipe and emergency blowoff pipe are generally also equipped with drum 12, for ensureing water quality.Continue to refine The structure of body of heater 11, its agent structure is using double framework all steel welding, and inner space also includes horizontal flue 113 and vertical Flue 114, horizontal flue 113 is located at the top of combustion chamber 111, its connection combustion chamber 111 and vertical flue 114, and combustion chamber 111 are oppositely arranged with vertical flue 114, and three encloses to form the flue gas produced after π types, low-heat value gas combustion successively through burning Room 111, horizontal flue 113 and the vertical discharge of flue 114 gas boiler 1, the flue gas discharged certainly by gas boiler 1 need to do Further purified treatment heel row is provided with full fin panel casing 115 to air on body of heater 11, at the same there also is provided roof tube with The steam of separation is introduced into roof tube and enclosure wall tube in enclosure wall tube, drum 12, then is allocated to follow-up overheat unit 13, Roof tube adds the membrane wall structure of band steel with enclosure wall tube using light pipe, and water-cooling wall 115 has at least one port and drum 12 Liquid outlet connection, usual water-cooling wall 115 has multiple ports and the liquid outlet of drum 12 to connect, and the aqueous in drum 12 can To enter through corresponding pipeline in water-cooling wall 115, and water-cooling wall 115 also has at least one port and the gas entrance of drum 12 Connection, water-cooling wall 115 is covered with water-cooling wall 115 wall with refractory lining, refracto, the water-cooling wall of body of heater 11 from adding band steel to be welded into using light pipe 115 weight is suspended on roof beam lattice by upper collecting chamber with suspension rod, and tiltedly rear water-cooling wall 115 is by drawing through horizontal flue 113 Outlet pipe is suspended on the steelframe of top, is expanded downwardly together after whole body of heater 11 is heated, and in the outside surrounding of water-cooling wall 115 along highly Direction sets one to enclose buckstay every 3m or so, to increase the rigidity of water-cooling wall 115, meets wanting for the design pressure of combustion chamber 111 Ask.Further, overheat unit 13 and economizer unit are respectively arranged with horizontal flue 113 and vertical flue 114 14, both of which is located at low-heat value gas combustion and produced on the flue of flue gas, wherein the gas of the overheat connection drum 12 of unit 13 goes out The steam of separation is introduced into above-mentioned roof tube in the entrance of high pressure cylinder 211 of mouth and steam turbine 21, drum 12, which part Steam, which enters in enclosure wall tube, to be heated, and the steam after heating enters in the overheat unit 13 and is heated to be 9.8MPa/540 DEG C of state again Superheated steam, then the superheated steam is imported in steam turbine 21 and done work, and economizer unit 14 then connects steam turbine 21 Condensation is provided with exhaust steam outlet and the liquid inlet of drum 12, and pipeline between economizer unit 14 and steam turbine 21 Device 23, the flue gas produced after low-heat value gas combustion flows to economizer unit 14 along horizontal flue 113 and vertical flue 114 During place, it also has higher temperature, and superheated steam turns into exhaust steam and discharged by exhaust steam outlet after being done work in steam turbine 21, and Condensed device 23 liquefies to be imported after aqueous in economizer unit 14, and then can be by 14 pairs of part aqueous of economizer unit Heated, the aqueous after heating imports the interior circulation of drum 12 and utilized.

In the utility model, in the combustion chamber 111 that low-heat value gas is imported to body of heater 11, by burner 112 by its point Combustion, while the aqueous in drum 12 is flow in water-cooling wall 115 through its liquid outlet, because low-heat value gas produces cigarette in burning Gas and adjoint substantial amounts of heat release, can be heated, and then cause by the partial heat to the aqueous in water-cooling wall 115 Part aqueous is mutually changed into steam, then imports the steam water interface again and vapor-liquid separation is carried out in drum 12, generally in body of heater Evaporation convection tube panel 116 is additionally provided with 11, it is spiral finned tube, is fixed on by the way of hanging on the steelframe of top, should The two ends of evaporation convection tube panel 116 are respectively communicated with the liquid outlet and gas entrance of drum 12, and the aqueous in this drum 12 is existed Part is split during being directed at water-cooling wall 115 and is heated to be steam, evaporation convection pipe into progress in evaporation convection tube panel 116 Steam water interface in screen 116, which is also directed into drum 12, carries out vapor-liquid separation, and aqueous after isolation continues to be conducted to water Heated again in cold wall 115 or evaporation convection tube panel 116, the steam after separation be then conducted to overheat in unit 13 also by Heat again, and then steam can be caused to be heated to be superheated steam, superheated steam can then can be conducted in steam turbine 21 Acting generating is carried out, the superheated steam after acting is generated as exhaust steam and exports export by the exhaust steam of steam turbine 21, and exhaust steam enters condensation Liquefaction is about 40 DEG C of aqueous in device 23, low-pressure heater 25 is driven into by condensate pump 24 afterwards, in low-pressure heater 25 Heated by the low-pressure pumping steam of steam turbine, and the aqueous come out from low-pressure heater 25 enters in oxygen-eliminating device 26, enters by oxygen-eliminating device 26 After row deoxygenation, high-pressure heater 28 is pumped into by feed pump 27, heated in high-pressure heater 28 by the high pressure extraction of steam turbine, so After be conducted into economizer unit 14 and be heated again, the aqueous after heating is imported to be followed successively in drum 12 according to above-mentioned steps Ring is used.In above-mentioned whole process, burner 112 in this way lights low-heat value gas, can cause low heat value Coal gas stable burning in combustion chamber 111, and in low-heat value gas after burned device 112 is lighted, its heat discharged first adds Aqueous in hot water cold wall 115 or evaporation convection tube panel 116, then can heat steam, also at overheat unit 13 finally Can be in the aqueous after heating acting at economizer unit 14, heat is repeatedly utilized, and low-heat value gas in whole process Heat be respectively positioned in body of heater 11, it is not easy to scatter and disappear, the overall thermal efficiency of electricity generation system can be effectively ensured, enhances carbonated drink and changes Heat.

Optimize above-described embodiment, reheater unit 15 is additionally provided with body of heater 11, the reheater unit 15 connection steamer The entrance of low pressure (LP) cylinder 212 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 does work after the importing of the entrance of high pressure cylinder 211 and generated electricity, and the steam after it does work can be by high pressure cylinder 211 Outlet export, and red switch is done work in 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 reheater unit 15 and is heated again as superheated steam, and superheated steam can be led Enter to carry out red switch again in low pressure (LP) cylinder 212 to do work, vapor (steam) temperature and pressure are lowered again, can be described as exhaust steam, exhaust steam is then by weary It is aqueous that vapor outlet, which 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 reheater unit 15 is refined, it includes installing in the low-temperature reheater 151 in vertical flue 114, steamer The outlet of high pressure cylinder 211 of machine 21 is to the low-temperature reheater 151.Low-temperature reheater 151 also uses the structure of spiral finned tube Steam is exported by high pressure cylinder 211 in form, and in-line counter-flow arrangement, steam turbine 21 enters entering for low-temperature reheater 151 after discharge 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 Temperature adjustment is carried out by attemperator in 151 import header, and the attemperator is mainly and uses watering temperature adjustment, finely tunes vapor (steam) temperature, Steam after desuperheat enters to be heated in low-temperature reheater 151.Usual reheater unit 15 also includes high temperature reheater 152, high temperature reheater 152 is installed in horizontal flue 113, and it connects low-temperature reheater 151 and the import of low pressure (LP) cylinder 212, due to Horizontal flue 113 is located at front of the vertical flue 114 along 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 is introduced into low-temperature reheater 151 and heated, and is then introduced into high temperature reheater 152 heat, and the steam after the heating of high temperature reheater 152 is superheated steam, can be conducted to the low pressure (LP) cylinder in steam turbine 21 Red switch is done work in 212.High temperature reheater 152 uses light-pipe structure, and for in-line down current arrangement, the row with low-temperature reheater 151 Column direction is on the contrary, heat absorption efficiency can be improved.Flue regulation is carried out at the corresponding reheater unit 15 of other body of heater 11, body of heater 11 Twin flue design is carried out in vertical flue 114, the end-position of twin flue is then provided with gas baffle 161, passes through regulation The aperture of gas baffle 161 realizes the distribution of exhaust gas volumn in two flues, and then can reach and adjusted by reheater unit 15 The purpose of reheat steam temperature is saved, so that the temperature of reheated steam and pressure are highly stable.

Further, the structure of refinement economizer unit 14, it includes installing in the main economizer of the vertical bottom of flue 114 141 and the bypass economizer 142 positioned at the top of 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 is saved Both are arranged side by side for coal device 142 and low-temperature reheater 151, respectively in the twin flue of vertical flue 114, and lead between the two Cross superheater partition wall 16 to be separated, generally use film partition structure, some vapor into roof tube can enter the mistake Heat in hot device partition wall 16, the steam after heating, which can enter, to be heated again in overheat unit 13 for superheated steam, and by upper Flue gas flow between 161 liang of regulation bypass economizers 142 of the gas baffle stated and the corresponding flue of low-temperature reheater 151, main province Coal device 141 is located at the lower section of twin flue end.In the present embodiment, flue gas edge bypasses economizer 142 to the direction of main economizer 141 Flowing, and the aqueous that condenser 23 is discharged then flows to bypass economizer 142 by main economizer 141, so as to realize working medium and cigarette Between gas each other countercurrently, main economizer 141 and bypass economizer 142 are helix fin tubular construction, wherein main economizer 141 is It is staggered in arrangement, and bypasses economizer 142 for in-line arrangement, bypass economizer 142 uses overhung construction, and total weight passes through hanging Device is fixed on enclosure wall tube, then is suspended in by enclosure wall tube header fairlead on the steelframe of top, and main economizer 141 is put on ventilation Liang Shang, ventilation beam passes body of heater 11 and is supported on the backplate of body of heater 11.In addition operationally, the aqueous provided by feed pump 27 is being entered Become owner of after being heated in economizer 141, a portion aqueous can be directly directed at as needed in drum 12 and be used as rinse water Use.

Optimize above-described embodiment, be upper space and lower space by vertical 114 points of flue, wherein 141, main economizer In in lower space, and bypass economizer 142 and be located at low-temperature reheater 151 in upper space, 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 to this in the junction of twin flue and single flue using nonmetallic expansion joint 117, and it can be with Expansion is absorbed, leakage is reduced.

Further, the structure of refinement overheat unit 13, includes the cryogenic overheating of pendant superheater component 131, convection type 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 the entrance of high pressure cylinder 211 of steam turbine 21.The heat absorption of pendant superheater component 131 is compared for 5.2% herein in addition ~6.1%, the heat absorption of low temperature superheater 132 is compared for 8.2%~9.7%, and the heat absorption of high temperature superheater 133 compares for 8.9%~ 9.5%, heat absorption accounts for the ratio of overall heat absorption, such as pendant superheater component 131 than being primarily referred to as the corresponding component in body of heater 11 Heat absorption ratio is 5.2%~6.1%, and the influence factor for the ratio that absorbs heat has a variety of, mainly according to the heating surface of corresponding component To determine, the position certainly also to corresponding component in body of heater is related, mainly close to combustion chamber 111 position flue-gas temperature compared with Height, and then be conducive to improving its heat absorption ratio, and use the overheat unit 13 of this structure type to cause the overheat after heating Steam is 9.8MPa/540 DEG C, HTHP electricity generation system is formed, so as to solve the easy overtemperature of the superheater surface of gas boiler 1 The problem of, carbonated drink parameter is stabilized, especially makes gas boiler 1 when load is drawn high or high load capacity is fluctuated, stabilizes carbonated drink ginseng Number, not only ensure that the safety of gas boiler 1, it is to avoid the risk of the easy booster of superheater, and improve low-heat value gas high temperature The overall thermal efficiency of high-voltage power generation system.In the present embodiment, pendant superheater component 131 is half radiant superheater, and low temperature Superheater 132 and high temperature superheater 133 are convection superheater, i.e., the overheat unit 13 that the utility model is provided is using radiation The mode being combined with convection current, multiple cross-mixing, during setting, pendant superheater component 131 be located at combustion chamber 111 just on Side, the high-temperature flue gas produced after low-heat value gas combustion is first flow at pendant superheater component 131, high temperature superheater 133 with it is low Warm superheater 132 is then set gradually along the flow direction of flue gas, the steam heated in enclosure wall tube and heating in superheater partition wall 16 Steam is imported in pendant superheater component 131, and is entered after the heating of pendant superheater component 131 in low temperature superheater 132 Heating, finally enters heating in high temperature superheater 133, and then can obtain superheated steam and done for the red switch in steam turbine 21 Work(.Typically, body of heater 11 extends in the exit of combustion chamber 111 to the inner bending of horizontal flue 113 is formed with furnace arch, furnace nose 118, rolls over flame Angle 118 includes the first tilting section and the second tilting section, wherein the first tilting section is tilted to horizontal flue 113 in the upward direction Extension, and the second tilting section is inclined upwardly extension from the direction of the first tilting section to vertical flue 114, so as to pass through First tilting section, which is formed, first reduces combustion chamber 111 to the bore of horizontal flue 113, then causes horizontal cigarette by the second tilting section Flow direction of the bore in road 113 along flue gas is in gradually-reducing shape, and it can be effectively improved the aerodynamic field in horizontal flue 113.It is above-mentioned Pendant superheater component 131 include before screen superheater 134 and Late reworking 135, both of which is located at 113 pairs of horizontal flue In the space for answering furnace arch, furnace nose 118, the gas outlet of preceding screen superheater 134 and drum 12, specifically with the outlet of enclosure wall tube And the outlet of superheater partition wall 16 so that before the steam in both can be flow in screen superheater 134, then screen is overheated The steam of heating shielded after being introduced into screen superheater 134 and low temperature superheater 132, preceding screen superheater 134 before device 135 is then connected Heat, entered back into low temperature superheater 132 in hot device 135.Preceding screen superheater 134, Late reworking 135, low temperature superheater 132 And high temperature superheater 133 is suspended on the steelframe of top by suspension rod, and it is made of 12Cr1MoVG materials, which part Steel Duan Ze grinds 102 steel alloys using steel.

Further, steam temperature adjustment structure is additionally provided with overheat unit 13, such as shielded in preceding screen superheater 134 with after One-level water spraying structure is provided with stream between hot device 135, one-level water spraying structure is using direct-contact desuperheater to preceding 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 it is installed on high temperature superheater 133, and high temperature superheater 133 includes two Individual cold section is located between two cold section, can be provided with the previous cold section of stream between hot arc with a hot arc, hot arc Two grades of water spraying structures, are adjusted to accurate adjustment, regulating valve and stop valve can be provided with stream, it is possible to achieve in stream herein The relative accurate adjustment of vapor (steam) temperature., can be with to this common adjustment effect by one-level water spraying structure and two grades of water spraying structures Ensure the temperature of the superheated steam under the rated load of gas boiler 1, water is used for one-level water spraying structure and two grades of water spraying structures Aqueous after the deoxygenation that can be extracted using feed pump 27.Also set up on stream generally between overheat unit 13 and steam turbine 21 Have a steam header 136, by high temperature superheater 133 heat after superheated steam be introduced into the steam header 136 and delayed Punching, is then directed to red switch in the high pressure cylinder 211 of steam turbine 21 and does work, and the parameter of the superheated steam detected at steam header As 9.8MPa/540 DEG C.

Further, an air preheater 17 is additionally provided with the bottom of vertical flue 114, is mended into combustion chamber 111 The flue gas that the air filled is introduced into air preheater 17, vertical flue 114 is flow at air preheater 17 can be into it 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 uses vertical channel structure, and single-stage one-stroke is arranged, the pipe of air preheater 17 is thin Parallel baffled in wall spiral grooved tube, 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.

, in summary, can be by after low-heat value gas combustion using the electricity generation system of said structure referring to Fig. 1 and Fig. 2 The Btu utilization acting of generation generates electricity, and concrete operation step is as follows：

Enter in the combustion chamber 111 that low-heat value gas is sent into gas boiler 1 through Dual-cyclone burner 112 by gas piping Row burning, burning produces heat, heats each heating surface；

Aqueous in drum 12 is flowed out by liquid outlet, and forms two streams, wherein a stream is sent into by pipeline The water-cooling wall 115 of body of heater 11, another stream sends into evaporation convection tube panel 116 by pipeline, and aqueous is in water-cooling wall 115 and evaporation pair Flow tube screen 116 is heated, and is mutually changed into steam water interface, drum 12 is sent 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 roof tube, and wherein two-way (preceding left side bag is wrapped with preceding right side) enters enclosure wall tube after being heated, separately Outer two-way (rear left side bag is wrapped with rear right side) enters superheater partition wall 16 after being heated, and is come out from enclosure wall tube and superheater partition wall 16 Steam enter preceding screen superheater 134 together；

Enter Late reworking 135, preceding screen superheater 134 and Late reworking 135 after preceding 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 passes through two grades of water sprays between hot arc Structure temperature adjustment again, the superheated steam after two grades of watering temperature adjustments enters steam header 136；

Superheated steam delivers to the high pressure cylinder 211 of steam turbine 21, steam red switch vapour after collection vapour header enters row buffering by pipeline The blade of turbine 21, steam turbine 21 drives generator 22 to be generated electricity, vapor (steam) temperature and pressure reduction after red switch acting；

The steam come out from high pressure cylinder 211 enters low-temperature reheater 151, and high temperature reheater 152 is entered afterwards and is added again Heat is superheated steam, and the superheated steam is imported into the low pressure (LP) cylinder 212 of steam turbine 21, and after red switch acting, vapor (steam) temperature and pressure are again Secondary reduction；

The exhaust steam come out from the low pressure (LP) cylinder 212 of steam turbine 21 is condensed into condenser 23, is condensed in condenser 23 It is about 40 DEG C of aqueous, low-pressure heater 25 is driven into by condensate pump 24 afterwards, by steam turbine in low-pressure heater 25 Low-pressure pumping steam is heated；

The water come out from low-pressure heater 25 enters oxygen-eliminating device 26, after oxygen-eliminating device 26 carries out deoxygenation, passes through feed pump 27 High-pressure heater 28 is squeezed into, is heated in high-pressure heater 28 by the high pressure extraction of steam turbine, afterwards into main economizer 141；

Aqueous enters bypass economizer 142 after main economizer 141 is by the flue gas of the vertical afterbody of flue 114, is entered Enter after the heating of one step and be recycled in drum 12, the aqueous and steam step being repeated in above steps.It is main in addition The outlet of economizer 141 is additionally provided with a branch road, drum 12 is delivered to as rinse water when being necessary, for the clear of drum 12 Wash.

Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model Within the spirit and principle of utility model, any modification, equivalent substitution and improvements made etc. should be included in the utility model Protection domain within.

Claims (10)

1. a kind of low-heat value gas HTHP electricity generation system, including gas boiler and generating set, the generating set bag Include the steam turbine being connected with the gas boiler pipeline and the generator that rotation is driven by the steam turbine, it is characterised in that： The body of heater of the gas boiler including built-in combustion room and can steam-water separation drum, the body of heater includes being located at the burning Water-cooling wall is provided with horizontal flue above room and the vertical flue connected with the horizontal flue, the body of heater, it is described At least one port of water-cooling wall is connected with the liquid outlet of the drum, and at least one port and the gas entrance of the drum connect It is logical, in the overheat unit that the superheated steam that can be thermally formed 9.8MPa/540 DEG C is provided with the horizontal flue, the overheat Unit connects gas outlet and the high pressure cylinder entrance of the steam turbine of the drum, and the overheat unit includes heat absorption and compared It is 5.2%~6.1% pendant superheater component, absorbs heat than the convection type low-temp superheater for being 8.2%~9.7% and heat absorption Than the convection type high temperature superheater for 8.9%~9.5%, three is sequentially communicated, and described in the gas outlet of the drum Pendant superheater component, the high temperature superheater connects the high pressure cylinder entrance of the steam turbine.

2. low-heat value gas HTHP electricity generation system as claimed in claim 1, it is characterised in that：The pendant superheater group Part is including the preceding screen superheater with the gas outlet of the drum and connects the preceding screen superheater and the low temperature mistake The Late reworking of hot device, and tied in being provided with one-level water spray on the stream of the preceding screen superheater and the Late reworking Structure.

3. low-heat value gas HTHP electricity generation system as claimed in claim 2, it is characterised in that：The high temperature superheater bag Include two cold section and hot arc, the hot arc be located at two it is described between cold section, and in previous described cold section and the hot arc Between stream on be provided with two grades of water spraying structures.

4. low-heat value gas HTHP electricity generation system as claimed in claim 1, it is characterised in that：In also being set in the body of heater Reheater unit is equipped with, the reheater unit connects the low pressure (LP) cylinder entrance of the steam turbine and the high pressure cylinder of the steam turbine Outlet.

5. low-heat value gas HTHP electricity generation system as claimed in claim 4, it is characterised in that：The reheater unit bag Include and install in the low-temperature reheater in the vertical flue, the high pressure cylinder outlet of the steam turbine to the cold reheat Device.

6. low-heat value gas HTHP electricity generation system as claimed in claim 5, it is characterised in that：The reheater unit is also Including installing in the high temperature reheater in the horizontal flue, the high temperature reheater connects the low-temperature reheater and the vapour The low pressure (LP) cylinder import of turbine.

7. low-heat value gas HTHP electricity generation system as claimed in claim 5, it is characterised in that：In in the vertical flue Economizer unit is provided with, the economizer unit includes installing in the main economizer of the vertical stack base and positioned at institute State the bypass economizer connected above main economizer and with the main economizer, the exhaust steam of the main economizer and the steam turbine Outlet is connected by condenser, and the bypass economizer is also communicated to the liquid inlet of the drum, and the bypass economizer It is arranged side by side, is separated between the two by superheater partition wall with the low-temperature reheater.

8. low-heat value gas HTHP electricity generation system as claimed in claim 7, it is characterised in that：The vertical flue includes Upper space and lower space, the main economizer are located in the lower space, and the bypass economizer and the low temperature are again Hot device is located in the upper space, and is connected between the upper space and the lower space by expansion joint.

9. low-heat value gas HTHP electricity generation system as claimed in claim 1, it is characterised in that：In the vertical flue Bottom is additionally provided with the air preheater with the combustion chamber.

10. low-heat value gas HTHP electricity generation system as claimed in claim 1, it is characterised in that：The body of heater is in described The exit of combustion chamber extends to form furnace arch, furnace nose to the horizontal flue inner bending, the furnace arch, furnace nose include in the upward direction to First tilting section of the tilted extension of horizontal flue and from first tilting section along to the direction of the vertical flue Acclivitous second tilting section.