CN206600784U - It is available for the gas boiler of low-heat value gas combustion - Google Patents

Abstract

The utility model is related to coal gas generating, a kind of gas boiler for being available for low-heat value gas combustion is provided, including body of heater and drum, body of heater also includes horizontal flue and vertical flue, smoke processing system is communicated to the bottom of vertical flue, water-cooling wall is provided with body of heater, at least one port of water-cooling wall is connected with the liquid outlet of drum, at least one port is connected with the gas entrance of drum, in being provided with overheat unit in horizontal flue, overheat unit has steam inlet tube and steam outlet pipe, steam inlet tube is communicated to the gas outlet of drum, steam outlet pipe extends to the outside of body of heater.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 gaseous 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

It is available for the gas boiler of low-heat value gas combustion

Technical field

The utility model is related to coal gas generating, more particularly to a kind of gas boiler for being available for low-heat value gas combustion.

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 gas boiler for being available for low-heat value gas combustion, it is intended to for solving The problem of thermal efficiency of existing low-heat value gas is relatively low.

What the utility model was realized in：

The utility model embodiment provides a kind of gas boiler for being available for low-heat value gas combustion, including built-in combustion room Body of heater and can steam-water separation drum, the body of heater include be located at the combustion chamber above horizontal flue and with the water The vertical flue of flat flue connection, smoke processing system is communicated on the bottom of the vertical flue, the body of heater and is provided with water 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, and in being provided with overheat unit in the horizontal flue, the overheat unit has steam inlet tube and steam Outlet pipe, the steam inlet tube is communicated to the gas outlet of the drum, and the steam outlet pipe extends to the outside of the body of heater.

Further, the overheat unit includes pendant superheater component, the low temperature superheater and convection type of convection type High temperature superheater, three is sequentially communicated, and the steam inlet tube is arranged at the pendant superheater component, the steam outlet pipe It is arranged on the high temperature superheater.

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, the overheat unit includes being arranged at the steam header on the outside of the body of heater, and the steam outlet pipe connects Pass in the steam header.

Further, in be additionally provided with the body of heater can connect peripheral hardware steam turbine high pressure cylinder outlet with low pressure (LP) cylinder import Reheater unit.

Further, the reheater unit include install in the vertical flue and can with the high pressure cylinder export connect Logical low-temperature reheater.

Further, the reheater unit also includes installing in the horizontal flue and can be with the low pressure (LP) cylinder import High temperature reheater, the high temperature reheater connects the low-temperature reheater.

Further, in being additionally provided with economizer unit in the vertical flue, the economizer unit has for extraneous Aqueous enter aqueous inlet pipe and be communicated to the drum liquid inlet aqueous outlet pipe.

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 gas boiler 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 into overheat unit in be heated to be superheated steam, can will superheated steam import steam turbine in enter Row acting hair.In above process, by burner stable burning low-heat value gas, first the aqueous water in water-cooling wall is heated to be Gaseous state, is then heated to be superheated steam using overheat unit by steam, is done work and generated electricity using superheated steam, can stablize carbonated drink ginseng Number, can both ensure security, additionally it is possible to improve the generating efficiency of low-heat value gas, generating efficiency is up to more than 37%, 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 gas boiler for being available for low-heat value gas combustion that Fig. 1 provides for the utility model embodiment；

Fig. 2 is the schematic flow sheet of Fig. 1 gas boiler for being available for low-heat value gas combustion.

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 gas boiler 1 for being available for low-heat value gas combustion, It can coordinate with the generating set 2 of peripheral hardware, 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.Specifically, gas boiler 1 includes built-in combustion The body of heater 11 of room 111 and can steam-water separation drum 12, burner 112, low-heat value gas are provided with combustion chamber 111 Import in combustion chamber 111 and releasing heat is lighted by burner 112, typically, multiple burners 112 are provided with combustion chamber 111, can On the front-back wall of combustion chamber 111, such as can be provided with by the support layered arrangement of burner 112 on front wall two layers, Wall is provided with one layer afterwards, and each layer is sequentially arranged at intervals with three burners 112, can cause to enter by this arrangement Low-heat value gas in combustion chamber 111 can be burnt completely, and coke-stove gas can be used in combustion chamber 111 as seed material, High-energy firing gun is provided with high-energy firing gun and coke oven air gun, first passes through high-energy ignition as igniter, every burner 112 Rifle lights coke-stove gas with the corresponding burner 112 that ignites, then lights low-heat value gas, upper strata burner 112 by burner 112 Can be without using igniter, layer burner 112 ignites on the lower, and each burner 112 uses double-cyclone structure type in addition, can To realize the burning to low-heat value gas, of course for guarantee combustion completion, fire defector is left on every support of burner 112 Device hole, for configuring fire inspection equipment, to ensure the safety of gas boiler 1 in combustion process；And drum 12 is located at body of heater 11 Outside, it can realize steam-water separation effect, using single hop vapo(u)rization system, cyclone separator is provided with drum 12, clear The equipment such as hole flushing plate, top wave form plate separator and top porous plate, after steam water interface is imported in drum 12, by upper Steam and aqueous that each separation equipment can be sufficiently separated in steam water interface are stated, and steam is filled in the top sky of drum 12 Between, aqueous then in the lower space of drum 12, is provided with 2 bi- colour water gauges, 2 electric contact water gages, 3 on drum 12 Single chamber water level balance container, for ensureing that steam quality is good and can handle the full water phenomenon of drum 12 in time, generally in pot Phosphate chemical feed pipe, continuous blowdown pipe and emergency blowoff pipe are also equipped with cylinder 12, for ensureing water quality.Continue to refine the knot of body of heater 11 Structure, 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, and it connects combustion chamber 111 and vertical flue 114, and combustion chamber 111 is with erecting Straight flue 114 is oppositely arranged, and three encloses the π types that to be formed, and the bottom of vertical flue 114 is the exhanst gas outlet of gas boiler 1, low The flue gas produced after calorific value of gas burning discharges coal gas pot through combustion chamber 111, horizontal flue 113 and vertical flue 114 successively Stove 1, the purified dedusting heel row of flue gas of outlet is provided with full fin panel casing 115, while going back cloth to air on body of heater 11 It is equipped with the steam of separation in roof tube and enclosure wall tube, drum 12 to be introduced into roof tube and enclosure wall tube, then is allocated to follow-up Overheat in unit 13, roof tube adds the membrane wall structure of band steel with enclosure wall tube using light pipe, water-cooling wall 115 has at least one Port is connected with the liquid outlet of drum 12, and usual water-cooling wall 115 has multiple ports and the liquid outlet of drum 12 to connect, drum Aqueous in 12 can enter in water-cooling wall 115 through corresponding pipeline, and water-cooling wall 115 also has at least one port and drum 12 gas entrance connection, water-cooling wall 115 is covered with water-cooling wall 115 wall with refractory lining, refracto, stove from adding band steel to be welded into using light pipe The weight of the water-cooling wall 115 of body 11 is suspended on roof beam lattice by upper collecting chamber with suspension rod, tiltedly after water-cooling wall 115 by through level The fairlead of flue 113 is suspended on the steelframe of top, is expanded downwardly together after whole body of heater 11 is heated, and outside water-cooling wall 115 Side surrounding sets one to enclose buckstay along short transverse every 3m or so, to increase the rigidity of water-cooling wall 115, meets combustion chamber 111 The requirement of design pressure.Further, be respectively arranged with horizontal flue 113 and vertical flue 114 overheat unit 13 with And economizer unit 14, both of which is located at low-heat value gas combustion and produced on the flue of flue gas, wherein overheat unit 13 has steaming Vapour inlet pipe and steam outlet pipe, the gas outlet of steam inlet tube connection drum 12, and steam outlet pipe connects the high pressure of steam turbine 21 The saturated vapor of separation is introduced into above-mentioned roof tube in the entrance of cylinder 211, drum 12, and which part steam enters in enclosure wall tube Heating, the steam after heating is entered in the overheat unit 13 by steam inlet tube is heated to be superheated steam again, then by the mistake Vapours is imported in steam turbine 21 by steam outlet pipe and done work, and economizer unit 14 then includes aqueous inlet pipe and aqueous goes out Pipe, wherein aqueous inlet pipe are used to import for extraneous aqueous, specifically connect the exhaust steam outlet of steam turbine 21, and liquid outlet pipe is then Connect and be provided with condenser 23 on the liquid inlet of drum 12, and pipeline between economizer unit 14 and steam turbine 21, when The flue gas produced after low-heat value gas combustion along horizontal flue 113 and vertical flue 114 flow at economizer unit 14 when, its Also there is higher temperature, and superheated steam turns into exhaust steam and discharged by exhaust steam outlet after being done work in steam turbine 21, and it is condensed The liquefaction of device 23 can enter to be imported after aqueous in economizer unit 14 by economizer unit 14 to the part aqueous Row heating, 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 make by the partial heat to the aqueous in water-cooling wall 115 Obtain part aqueous and be mutually changed into steam, then the steam water interface is imported again vapor-liquid separation is carried out in drum 12, generally in stove Evaporation convection tube panel 116 is additionally provided with body 11, it is spiral finned tube, is fixed on by the way of hanging on the steelframe of top, The two ends of evaporation convection tube panel 116 are respectively communicated with the liquid outlet and gas entrance of drum 12, to the aqueous in this drum 12 Part is split during water-cooling wall 115 is directed at and is heated to be steam, evaporation convection into progress in evaporation convection tube panel 116 Steam water interface in tube panel 116, which is also directed into drum 12, carries out vapor-liquid separation, and aqueous after isolation continues to be conducted to Heated again in water-cooling wall 115 or evaporation convection tube panel 116, the steam after separation is then conducted in overheat unit 13 It is heated again, and then steam can be caused to be heated to be superheated steam, superheated steam can be then conducted to steam turbine 21 Interior progress acting generating, 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 cold Liquefaction is about 40 DEG C of aqueous in condenser 23, low-pressure heater 25 is driven into by condensate pump 24 afterwards, in low-pressure heater 25 The middle low-pressure pumping steam by steam turbine is heated, and the aqueous come out from low-pressure heater 25 enters in oxygen-eliminating device 26, by oxygen-eliminating device 26 Carry out after deoxygenation, high-pressure heater 28 be pumped into by feed pump 27, heated in high-pressure heater 28 by the high pressure extraction of steam turbine, It is then introduced into economizer unit 14 and is heated again, in the aqueous importing drum 12 after heating according to above-mentioned steps successively Recycle.In above-mentioned whole process, burner 112 in this way lights low-heat value gas, can cause low-heat It is worth coal gas stable burning in combustion chamber 111, and in low-heat value gas after burned device 112 is lighted, its heat discharged is first The aqueous in water-cooling wall 115 or evaporation convection tube panel 116 is heated, then steam can be heated at overheat unit 13, finally Can also be in the aqueous after heating acting at economizer unit 14, heat is repeatedly utilized, and low calorific value coal in whole process The heat of gas is respectively positioned in body of heater 11, it is not easy to scatter and disappear, the overall thermal effect of low-heat value gas in gas boiler can be effectively ensured Rate, enhances steam-water heat exchanging.

Optimize above-described embodiment, reheater unit 15 is additionally provided with body of heater 11, the reheater unit 15 connection steamer The import 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 gas boiler.

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, body of heater 11 are carried out at the corresponding reheater unit 15 of other body of heater 11 Vertical flue 114 in carry out twin flue design, the end-position of twin flue is then provided with gas baffle 161, pass through adjust Save the aperture of gas baffle 161 to realize the distribution of exhaust gas volumn in two flues, and then can reach by reheater unit 15 The purpose of reheat steam temperature is adjusted, 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 between the two It is separated by superheater partition wall 16, generally use film partition structure, some vapor into roof tube can enter this Heat in superheater partition wall 16, the steam after heating, which can enter, to be heated again in overheat unit 13 as superheated steam, and by Flue gas flow between above-mentioned 161 liang of regulation bypass economizers 142 of gas baffle and the corresponding flue of low-temperature reheater 151, it is main Economizer 141 is located at the lower section of twin flue end.In the present embodiment, flue gas edge bypasses economizer 142 to the side of main economizer 141 To flowing, and the aqueous that condenser 23 is discharged then flows to bypass economizer 142 by main economizer 141, thus realize working medium with Between flue gas each other countercurrently, main economizer 141 and bypass economizer 142 are helix fin tubular construction, wherein main economizer 141 To be staggered in arrangement, and economizer 142 is bypassed for in-line arrangement, bypass economizer 142 uses overhung construction, and total weight is by hanging Hang 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 logical On wind beam, 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 exists After being heated in into main economizer 141, a portion aqueous can be directly directed at as needed in drum 12 and be used as cleaning Water is used.

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, and wherein steam inlet tube is arranged on pendant superheater component 131, and is steamed Vapour outlet pipe is arranged on high temperature superheater 133.In the present embodiment, pendant superheater component 131 is half radiant superheater, and low Warm superheater 132 and high temperature superheater 133 are convection superheater, i.e., the overheat unit 13 that the utility model is provided is used The mode that radiation is combined with convection current, multiple cross-mixing, during setting, pendant superheater component 131 is located at combustion chamber 111 The high-temperature flue gas produced after surface, low-heat value gas combustion is first flow at pendant superheater component 131, high temperature superheater 133 Then set gradually with low temperature superheater 132 along the flow direction of flue gas, the steam heated in enclosure wall tube in superheater partition wall 16 with adding The steam of heat is imported in pendant superheater component 131, and enters low temperature superheater after the heating of pendant superheater component 131 Heated in 132, finally entering heating in high temperature superheater 133, and then can obtain superheated steam is used for rushing in steam turbine 21 Turn acting.By arranging the overheat unit 13 of this structure, the heat absorption ratio that can cause three kinds of superheaters is respectively：Screen formula is overheated The heat absorption of device assembly 131 is than being 6%~7%, and the heat absorption of high temperature superheater 133 is than being 9.5%~10.5%, and low temperature superheater 132 is inhaled Heat is than being 9.0%~10.5%, so that the problem of solving the superheater surface of gas boiler 1 easy overtemperature, stabilizes carbonated drink ginseng Number, especially makes gas boiler 1 when load is drawn high or high load capacity is fluctuated, stabilizes carbonated drink 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 entirety for the gas boiler for being available for low-heat value gas combustion The thermal efficiency.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, Furnace arch, furnace nose 118 includes the first tilting section and the second tilting section, wherein the first tilting section is in the upward direction into horizontal flue 113 Extension is tilted, and the second tilting section is inclined upwardly extension from the direction of the first tilting section to vertical flue 114, so as to Formed by the first tilting section and first reduce combustion chamber 111 to the bore of horizontal flue 113, water is then caused by the second tilting section Flow direction of the bore of flat flue 113 along flue gas is in gradually-reducing shape, and it can be effectively improved the aerodynamic field in horizontal flue 113. Screen superheater 134 and Late reworking 135 before above-mentioned pendant superheater component 131 includes, both of which are located at horizontal flue In the space of 113 correspondence furnace arch, furnace noses 118, the gas outlet of preceding screen superheater 134 and drum 12, specifically with enclosure wall tube Outlet and the outlet of superheater partition wall 16 so that before the steam in both can be flow in screen superheater 134, then shield After the steam of heating is introduced into screen superheater 134 and low temperature superheater 132, preceding screen superheater 134 before superheater 135 is then connected Shield in superheater 135 and heat, enter back into low temperature superheater 132.Preceding screen superheater 134, Late reworking 135, cryogenic overheating Device 132 and high temperature superheater 133 are suspended on the steelframe of top by suspension rod, and are made of 12Cr1MoVG materials, wherein Part steel Duan Ze grinds 102 steel alloys using steel.

Further, steam temperature adjustment structure is additionally provided with overheat unit 13, such as in preceding screen superheater 134 and rear screen One-level water spraying structure is provided with stream between superheater 135, one-level water spraying structure is overheated using direct-contact desuperheater to preceding screen Steam spray cooling in stream between device 134 and Late reworking 135, this is coarse adjustment, can tentatively adjust the temperature of steam Degree.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 cold section is located between two cold section, can be set on the previous cold section of stream between hot arc with a hot arc, hot arc There are two grades of water spraying structures, accurate adjustment is adjusted to herein, regulating valve and stop valve can be provided with stream, it is possible to achieve stream The relative accurate adjustment of interior vapor (steam) temperature., can to this common adjustment effect by one-level water spraying structure and two grades of water spraying structures To ensure the temperature of the superheated steam under the rated load of gas boiler 1, for the use of one-level water spraying structure and two grades of water spraying structures Aqueous after the deoxygenation that water can be extracted using feed pump 27.Also set on stream generally between overheat unit 13 and steam turbine 21 Be equipped with a steam header 136, by high temperature superheater 133 heat after superheated steam be introduced into progress in the steam header 136 Buffering, is then directed to red switch in the high pressure cylinder 211 of steam turbine 21 and does work.

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 gas boiler 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：

Low-heat value gas is sent into the combustion chamber 111 of gas boiler 1 by gas piping through Dual-cyclone burner 112 Burnt, burning produces heat, heat 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 goes out from enclosure wall tube and superheater partition wall 16 The steam come enters 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 gas boiler for being available for low-heat value gas combustion, it is characterised in that：Body of heater including built-in combustion room and can The drum of steam-water separation, the body of heater includes the horizontal flue being located above the combustion chamber and connected with the horizontal flue Vertical flue, smoke processing system, which is communicated on the bottom of the vertical flue, the body of heater, is provided with water-cooling wall, the water At least one port of cold wall is connected with the liquid outlet of the drum, and at least one port and the gas entrance of the drum connect Logical, in being provided with overheat unit in the horizontal flue, the overheat unit has steam inlet tube and steam outlet pipe, the steaming Vapour inlet pipe is communicated to the gas outlet of the drum, and the steam outlet pipe extends to the outside of the body of heater.

2. the gas boiler of low-heat value gas combustion is available for as claimed in claim 1, it is characterised in that：The overheat unit bag The high temperature superheater of pendant superheater component, the low temperature superheater of convection type and convection type is included, three is sequentially communicated, and described Steam inlet tube is arranged at the pendant superheater component, and the steam outlet pipe is arranged on the high temperature superheater.

3. the gas boiler of low-heat value gas combustion is available for as claimed in claim 2, it is characterised in that：The pendant superheater Component is including the preceding screen superheater with the gas outlet of the drum and connects the preceding screen superheater and the low temperature The Late reworking of superheater, and tied in being provided with one-level water spray on the stream of the preceding screen superheater and the Late reworking Structure.

4. the gas boiler of low-heat value gas combustion is available for as claimed in claim 2, it is characterised in that：The high temperature superheater Including 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 heat Two grades of water spraying structures are provided with stream between section.

5. the gas boiler of low-heat value gas combustion is available for as claimed in claim 1, it is characterised in that：The overheat unit bag The steam header being arranged on the outside of the body of heater is included, the steam outlet pipe is communicated in the steam header.

6. the gas boiler for being available for low-heat value gas combustion as described in claim any one of 1-5, it is characterised in that：In described The reheater unit of the high pressure cylinder outlet and low pressure (LP) cylinder import that can connect peripheral hardware steam turbine is additionally provided with body of heater.

7. the gas boiler of low-heat value gas combustion is available for as claimed in claim 6, it is characterised in that：The reheater unit Including install in the vertical flue and can be with the high pressure cylinder outlet low-temperature reheater.

8. the gas boiler of low-heat value gas combustion is available for as claimed in claim 7, it is characterised in that：The reheater unit Also include installing in the horizontal flue and can be with the low pressure (LP) cylinder import high temperature reheater, high temperature reheater connection The low-temperature reheater.

9. the gas boiler for being available for low-heat value gas combustion as described in claim any one of 2-5, it is characterised in that：In described Economizer unit is additionally provided with vertical flue, the economizer unit has the aqueous inlet pipe entered for extraneous aqueous and company Pass to the aqueous outlet pipe of the liquid inlet of the drum.

10. the gas boiler of low-heat value gas combustion is available for as claimed in claim 1, it is characterised in that：The body of heater is in institute The exit for stating combustion chamber 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 first tilting section of the tilted extension of the horizontal flue and from first tilting section along to the side of the vertical flue To acclivitous second tilting section.