CN206625876U - The subcritical electricity generation system of low-heat value gas superhigh temperature - Google Patents

Abstract

It the utility model is related to coal gas generating, a kind of subcritical electricity generation system of low-heat value gas superhigh temperature is provided, including gas boiler and generating set, generating set includes steam turbine, gas boiler includes body of heater and drum, in the overheat unit that the superheated steam that can be thermally formed 16.7MPa/566 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 7.5%~8.5%, heat absorption is than the low temperature superheater for 10.3%~11.8% and absorbs heat than the high temperature superheater for being 10.9%~11.9%, 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

The subcritical electricity generation system of low-heat value gas superhigh temperature

Technical field

It the utility model is related to coal gas generating, more particularly to a kind of subcritical electricity generation system of low-heat value gas superhigh temperature.

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 is generated in journey, such as blast furnace gas, coal gas of converter and coke-stove gas.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, is difficult to stabilization Burning, the features such as generating efficiency is low.

Blast furnace gas is a kind of colorless and odorless, odorless mixed gas, main component CO, CO₂、N₂、 H₂、CH₄Deng it Middle combustible component CO contents account for 25%；H₂、CH₄Content it is seldom, gross calorific power is influenceed little；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 caused heat in substantial amounts of combustion process；Flame is longer；Ignition temperature is about 700 DEG C；Flame passes It is very slow to broadcast speed, temperature is not high, and 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 vary 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 The gas boiler for considering to bring because the calorific value of blast furnace gas is low, is difficult to stable the features such as burning conducts heat and the cores such as heating surface is arranged Major issue, do not consider how to improve low-heat value gas generating efficiency by carbonated drink side process optimization yet.

It is special meanwhile many blast furnace gas boilers have desuperheating water usage amount in high load capacity considerably beyond design load at present It is not to be drawn high in gas boiler load or in the case of high load capacity gas boiler load fluctuation, desuperheating water be present 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 as to solve the problems, such as the easy overtemperature of gas boiler superheater surface, Stable carbonated drink parameter, improve 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 subcritical electricity generation system of low-heat value gas superhigh temperature, it is intended to for solving The problem of thermal efficiency of certainly existing low-heat value gas is relatively low.

What the utility model was realized in：

The utility model embodiment provide a kind of subcritical electricity generation system of low-heat value gas superhigh temperature, including gas boiler with And generating set, the generating set include the steam turbine being connected with the gas boiler pipeline, the gas boiler includes interior Put combustion chamber body of heater and can steam-water separation drum, the combustion chamber passes through multiple burners and supply low-heat value gas Gas piping is connected, and burner described in which part is installed on the front wall of the body of heater, and burner described in another part is pacified On the rear wall of the body of heater, and the two-part burner is liquidated arrangement, and water-cooling wall is provided with the body of heater, described At least one port of water-cooling wall connects 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 16.7MPa/566 DEG C is provided with the body of heater, the overheat unit Gas outlet and the high pressure cylinder entrance of the steam turbine of the drum are connected, and the overheat unit is including heat absorption ratio Convection type low-temp superheater and heat absorption of 7.5%~8.5% pendant superheater component, heat absorption ratio for 10.3%~11.8% Than the convection type high temperature superheater for 10.9%~11.9%, three is sequentially communicated, and the gas outlet institute of the drum Pendant superheater component is stated, 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 level water spraying structure 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 body of heater, the steam turbine High pressure cylinder outlet is to the low-temperature reheater, and the low-temperature reheater is close to the end of the body of heater inner flue.

Further, the reheater unit also includes installing in the high temperature reheater of the body of heater, the high temperature reheating Device connects the low pressure (LP) cylinder import of the low-temperature reheater and the steam turbine, and the high temperature reheater is close to the overheat unit.

Further, in being provided with economizer unit in the body of heater, between the economizer unit and the steam turbine Pipeline on be provided with condenser, the economizer unit includes installing in body of heater close to the main economizer of flue end and position The bypass economizer connected above the main economizer and with the main economizer, the condensator outlet are communicated to the master Economizer, the bypass economizer is also communicated to the liquid inlet of the drum, and the bypass economizer and the low temperature are again Hot device is arranged side by side, and is separated between the two by superheater partition wall.

Further, the body of heater has upper space and lower space, main province's coal in the end of the flue Device is located in the lower space, and the bypass economizer is located in the upper space with the low-temperature reheater, and described Connected between upper space and the lower space by expansion joint.

Further, the end of the body of heater inner flue is provided with the air preheater with the combustion chamber.

Further, each burner includes igniting tracheae, Gas Pipe and the combustion-supporting gas being socketed successively from inside to outside Pipe, the Gas Pipe are connected with low-heat value gas supply pipe.

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 Its is burnt under and 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 The aqueous water to burn 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 imports 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 in overheat unit the superheated steam for being heated to be 16.7MPa/566 DEG C of state, the superheated steam It is subcritical for superhigh temperature, superheated steam can be imported in steam turbine and carry out acting generating.In above process, this knot is passed through The burner stable burning low-heat value gas of structure arrangement, is first heated to be gaseous state by the aqueous water in water-cooling wall, then using overheat Steam is heated to be superheated steam by unit, is done work and generated electricity using superheated steam, can stablized carbonated drink parameter, can both ensure safety Property, additionally it is possible to the generating efficiency of low-heat value gas is improved, heat utilization ratio 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 required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only It is some embodiments of the 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.

Fig. 1 is the structural representation for the subcritical electricity generation system of low-heat value gas superhigh temperature that the utility model embodiment provides Figure；

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

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, 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, belong 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 superhigh temperature the subcritical system that generates electricity System, including gas boiler 1 and generating set 2, low-heat value gas, which can be imported in gas boiler 1, to be burnt, and is then utilized Heat caused by low-heat value gas combustion is generated electricity by generating set 2, and generating set 2 includes steam turbine 21 and generator 22, steam turbine 21 includes high pressure cylinder 211, and low-heat value gas heat caused by burning in gas boiler 1 can heat aqueous water For steam, and then steam can be imported in high pressure cylinder 211 and drive steam turbine 21 to do work, generator is then driven by steam turbine 21 22 rotary electrifications, and steam acting is exported by exhaust steam as exhaust steam and exports recycling.The structure of gas boiler 1 is refined, its Body of heater 11 including built-in combustion room 111 and can steam-water separation drum 12, burner 112 is provided with combustion chamber 111, Low-heat value gas imports in combustion chamber 111 and lights releasing heat by burner 112, typically, multiple combustions is provided with combustion chamber 111 Burner 112, can be by the support layered arrangement of burner 112 on the front-back wall of combustion chamber 111, for example can be set on front wall It is equipped with two layers, rear wall is provided with one layer, and each layer is sequentially arranged at intervals with three burners 112, can by this arrangement To enable the low-heat value gas entered in combustion chamber 111 to burn completely, coke-stove gas conduct can be used in combustion chamber 111 Seed material, high-energy firing gun include igniting tracheae, Gas Pipe and combustion-supporting tracheae as igniter, every burner 112, Three is socketed successively from inside to outside, and wherein Gas Pipe is connected with low-heat value gas supply pipe, and low-heat value gas enters through Gas Pipe In burner 112, and combustion-supporting tracheae is then to be used to import air, and burner 112 is also combined with high-energy firing gun and coke oven in addition Air gun, first pass through high-energy firing gun light coke-stove gas by tracheae of lighting a fire ignite corresponding to burner 112, then by burner 112 light low-heat value gas, and upper strata burner 112 can be without using igniter, and layer burner 112 ignites on the lower, each in addition Burner 112 uses double-cyclone structure type, it is possible to achieve the burning to low-heat value gas, pacifies of course for ensureing to burn Entirely, flame detecting device hole is left on every support of burner 112, for configuring fire inspection equipment, to ensure in combustion process The safety of gas boiler 1；And drum 12 is located at the outside of body of heater 11, it can realize steam-water separation effect, be evaporated using single hop System, the equipment such as cyclone separator, cleaning orifice, top wave form plate separator and top porous plate are provided with drum 12, After steam water interface is imported in drum 12, the steam that can be sufficiently separated by above-mentioned each separation equipment in steam water interface With aqueous, and steam is filled in the upper space of drum 12, and aqueous then in the lower space of drum 12, is set on drum 12 Have 2 bi- colour water gauges, 2 electric contact water gages, 3 single chamber water level balance containers, for ensure steam quality it is good and Can the full water phenomenon of timely processing drum 12, be generally also equipped with phosphate chemical feed pipe in drum 12, continuous blowdown pipe and promptly put Water pipe, for ensureing water quality.Continue to refine the structure of body of heater 11, its agent structure is welded using double framework all steels, and inner space Also include horizontal flue 113 and vertical flue 114, horizontal flue 113 are located at the top of combustion chamber 111, it connects burning Room 111 and vertical flue 114, and combustion chamber 111 is oppositely arranged with vertical flue 114, three encloses the π types that to be formed, low calorific value coal Caused flue gas discharges gas boiler 1 through combustion chamber 111, horizontal flue 113 and vertical flue 114 successively after gas burning, when The flue gas so discharged by gas boiler 1 needs to do further purified treatment heel row to air, and full membrane type is provided with body of heater 11 Water-cooling wall 115, while roof tube and enclosure wall tube are there also is provided, the steam of separation is introduced into roof tube and enclosure wall tube in drum 12 It is interior, then be allocated to follow-up overheat unit 13, roof tube adds the membrane wall structure of band steel, water with enclosure wall tube using light pipe There is cold wall 115 at least one port to be connected with the liquid outlet of drum 12, and usual water-cooling wall 115 has multiple ports and drum 12 Liquid outlet connection, the aqueous in drum 12 can enter in water-cooling wall 115 through corresponding pipeline, and water-cooling wall 115 also has There is at least one port to be connected with the gas entrance of drum 12, water-cooling wall 115 adds band steel to be welded into from using light pipe, and in water cooling Wall with refractory lining, refracto is covered with wall 115, the weight of the water-cooling wall 115 of body of heater 11 is suspended on roof beam lattice by upper collecting chamber with suspension rod, tiltedly Water-cooling wall 115 through the fairlead of horizontal flue 113 by being suspended on the steelframe of top afterwards, after whole body of heater 11 is heated downwardly together Expansion, and a circle buckstay is set every 3m or so along short transverse in the outside surrounding of water-cooling wall 115, to increase water-cooling wall 115 Rigidity, meet the requirement of the design pressure of combustion chamber 111.Further, divide in horizontal flue 113 and vertical flue 114 Overheat unit 13 and economizer unit 14 are not provided with, both of which is located at low-heat value gas combustion and produced on the flue of flue gas, Gas outlet and the entrance of high pressure cylinder 211 of steam turbine 21 that unit 13 connects drum 12 are wherein overheated, is separated in drum 12 Steam is introduced into above-mentioned roof tube, and which part steam, which enters in enclosure wall tube, to be heated, and the steam after heating enters the overheat It is heated to be the superheated steam of 16.7MPa/566 DEG C of state in unit 13 again, the superheated steam of the state is subcritical for superhigh temperature, Can will the superheated steam import steam turbine 21 in do work, and economizer unit 14 then connect steam turbine 21 exhaust steam export and The liquid inlet of drum 12, and condenser 23 is provided with the pipeline between economizer unit 14 and steam turbine 21, work as low-heat After value gas-fired caused flue gas along horizontal flue 113 and vertical flue 114 flow at economizer unit 14 when, it is also With higher temperature, and superheated steam turns into exhaust steam and exports discharge, and condensed device by exhaust steam after being done work in steam turbine 21 23 liquefaction can add to be imported after aqueous in economizer unit 14 by economizer unit 14 to the part aqueous Heat, the aqueous after heating, which is imported in drum 12, to be recycled.

In the utility model, low-heat value gas is imported in the combustion chamber 111 of 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 both 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 into carrying out being heated to be steam, evaporation convection 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 to overheat in 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 Acting generating is inside 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 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 heats, and the aqueous come out from low-pressure heater 25 enters in oxygen-eliminating device 26, by oxygen-eliminating device 26 After carrying out 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, 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 can heat steam 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 scatters and disappears, the overall thermal efficiency of electricity generation system can be effectively ensured, enhance carbonated drink Heat exchange.

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 export.In the present embodiment, general steam turbine 21 also includes There are low pressure (LP) cylinder 212, superheated steam to do work after being imported by the entrance of high pressure cylinder 211 to generate electricity, 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 reduces, and this can be conducted into reheater unit 15 to be heated again and can be led for superheated steam, superheated steam 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,.On the other hand, the profit of superheated steam can be improved by setting up reheater unit 15 With rate, ensure 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 Form, and in-line counter-flow arrangement, steam enters entering for low-temperature reheater 151 after exporting discharge by high pressure cylinder 211 in steam turbine 21 Mouth header, can be provided with attemperator at the import header, i.e., the steam that high pressure cylinder 211 is discharged is introduced into low-temperature reheater Temperature adjustment is carried out by attemperator in 151 import header, and the attemperator mainly uses watering temperature adjustment, finely tunes vapor (steam) temperature, Steam after desuperheat, which enters in low-temperature reheater 151, to be heated.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 are introduced into low-temperature reheater 151 and heated, and are then introduced into high temperature reheater 152 heating, and the steam after the heating of high temperature reheater 152 is superheated steam, the low pressure (LP) cylinder that can be conducted in steam turbine 21 Red switch is done work in 212.High temperature reheater 152 uses light-pipe structure, and is 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, passes through tune The aperture for saving gas baffle 161 realizes 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 economizer unit 14 is refined, it includes installing in the main economizer of the vertical bottom of flue 114 141 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 and save 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 Heating in superheater partition wall 16, the steam after heating, which can enter in overheat unit 13, to be heated again as superheated steam, and by Flue gas flow between above-mentioned 161 liang of regulation bypass economizers 142 of gas baffle and 151 corresponding flue of low-temperature reheater, 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, so as to 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 it is in-line arrangement to bypass economizer 142, and 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 at work, the aqueous provided by feed pump 27 exists After being heated in into main economizer 141, a portion aqueous directly can be directed in drum 12 as cleaning as needed Water uses.

Optimize above-described embodiment, vertical flue 114 is divided for upper space and lower space, 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 and bottom sky Between between then connected by expansion joint 117.In the present embodiment, vertical flue 114 is divided into by above-mentioned twin flue with single flue Upper space and lower space, i.e. twin flue correspond to upper space, and main economizer 141 is located at the lower section of twin flue, are single cigarette Road, corresponding 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, reduces leakage.

Further, the structure of refinement overheat unit 13, the cryogenic overheating of pendant superheater component 131, convection type is included The high temperature superheater 133 of device 132 and convection type, three is sequentially communicated, i.e., steam successively by 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 7.5% herein in addition ~8.5%, the heat absorption of low temperature superheater 132 is compared for 10.3%~11.8%, and the heat absorption of high temperature superheater 133 is compared for 10.9% ~11.9%, heat absorption accounts for the ratio totally absorbed heat, such as pendant superheater component than being primarily referred to as the corresponding component in body of heater 11 131 heat absorption ratios are 7.5%~8.5%, and the influence factor for the ratio that absorbs heat have it is a variety of, mainly according to the heated of corresponding component Face determines that the position also to corresponding component in body of heater is related certainly, mainly the position flue gas temperature close to combustion chamber 111 Degree is higher, and then is advantageous to improve its ratio that absorbs heat, and after using the overheat unit 13 of this structure type to cause heating Superheated steam is 16.7MPa/566 DEG C, HTHP electricity generation system is formed, so as to solve the superheater surface of gas boiler 1 The problem of easy overtemperature, carbonated drink parameter is stabilized, gas boiler 1 is stabilized when load is drawn high or high load capacity fluctuates Carbonated drink parameter, the safety of gas boiler 1 is not only ensure that, avoids the risk of the easy booster of superheater, and improve low calorific value coal The overall thermal efficiency of the subcritical electricity generation system of gas superhigh temperature.In the present embodiment, pendant superheater component 131 overheats for half radiant type Device, and low temperature superheater 132 and high temperature superheater 133 are convection superheater, i.e., overheat unit provided by the utility model 13 using radiation by the way of convection current is combined, multiple cross-mixing, during setting, pendant superheater component 131 is located at combustion chamber 111 surface, caused high-temperature flue gas is first flow at pendant superheater component 131 after low-heat value gas combustion, hyperthermia and superheating Device 133 is then set gradually with low temperature superheater 132 along the flow direction of flue gas, by steam and the superheater partition wall 16 heated in enclosure wall tube The steam of interior heating is imported in pendant superheater component 131, and enters cryogenic overheating after the heating of pendant superheater component 131 Heated in device 132, finally enter in high temperature superheater 133 and heat, and then superheated steam can be obtained and be used in steam turbine 21 Red switch is done work.Typically, body of heater 11 extends formed with furnace arch, furnace nose in the exit of combustion chamber 111 to the inner bending of horizontal flue 113 118, 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 to horizontal flue 113 tilted extensions, and the second tilting section is inclined upwardly extension from the direction of the first tilting section to vertical flue 114, from And can be formed by the first tilting section and first reduce combustion chamber 111 to the bore of horizontal flue 113, then pass through the second tilting section So that flow direction of the bore of horizontal flue 113 along flue gas is in gradually-reducing shape, its air that can be effectively improved in horizontal flue 113 moves The field of force.Screen superheater 134 and Late reworking 135 before above-mentioned pendant superheater component 131 includes, both of which is positioned at level In the space of the corresponding furnace arch, furnace nose 118 of flue 113, the gas outlet of preceding screen superheater 134 and drum 12, specifically with bag wall The outlet of pipe and the outlet of superheater partition wall 16 so that before the steam in both can be flow in screen superheater 134, and Screen superheater 134 and low temperature superheater 132 before Late reworking 135 then connects, the steam of the interior heating of preceding screen superheater 134 are advanced Enter in Late reworking 135 and heat, enter back into low temperature superheater 132.Preceding screen superheater 134, Late reworking 135, low temperature Superheater 132 and high temperature superheater 133 are suspended on the steelframe of top by suspension rod, and are made of 12Cr1MoVG materials, Which part steel Duan Ze grinds 102 steel alloys using steel.

Further, overheat and steam temperature adjustment structure is additionally provided with 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 level water spraying structure, and it is installed on high temperature superheater 133, and high temperature superheater 133 includes Two cold section can be set with a hot arc, hot arc between two cold section on the previous cold section of stream between hot arc There is the two level water spraying structure, be adjusted to accurate adjustment 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.Common adjustment effect to this by one-level water spraying structure and two level water spraying structure, can 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 level water spraying structure Water can use aqueous after the deoxygenation that feed pump 27 extracts.Also set on stream generally between overheat unit 13 and steam turbine 21 A steam header 136 is equipped with, the superheated steam after being heated by high temperature superheater 133 is introduced into the steam header 136 and carried out Buffering, it is then directed to red switch in the high pressure cylinder 211 of steam turbine 21 and does work, and the superheated steam detected at steam header Parameter is 16.7MPa/566 DEG C.

Further, an air preheater 17 is additionally provided with the bottom of vertical flue 114, is mended into combustion chamber 111 The air filled is introduced into air preheater 17, and the flue gas in 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 does not mix with the air in air preheater 17, Liang Zhewei Non-contact thermal.Air preheater 17 uses vertical channel structure, and single-stage one-stroke arrangement, 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 shock baffle is housed.

, 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 Caused Btu utilization acting 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, 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 are sent 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 wraps with preceding right side) enters enclosure wall tube after being heated, separately Outer two-way (rear left side bag wraps with rear right side) enters superheater partition wall 16 after being heated, and goes out from enclosure wall tube and superheater partition wall 16 Screen superheater 134 before the steam come enters 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 is sprayed water at cold section of high temperature superheater 133 between hot arc by two level Structure temperature adjustment again, the superheated steam after two level watering temperature adjustment enter 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 drive generator 22 to be generated electricity, and vapor (steam) temperature and pressure reduce after red switch acting；

The steam come out from high pressure cylinder 211 enters low-temperature reheater 151, is added again into high temperature reheater 152 afterwards 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 heats；

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 in drum 12 and be recycled, 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., the utility model should be included in Protection domain within.

Claims (10)

1. a kind of subcritical electricity generation system of low-heat value gas superhigh temperature, including gas boiler and generating set, the generator Group includes the steam turbine being connected with the gas boiler pipeline, it is characterised in that：The gas boiler includes built-in combustion room Body of heater and can steam-water separation drum, the combustion chamber pass through multiple burners with supply low-heat value gas gas piping connect It is logical, and burner described in which part is installed on the front wall of the body of heater, burner described in another part is installed in the stove On the rear wall of body, and the two-part burner liquidates arrangement, water-cooling wall is provided with the body of heater, the water-cooling wall is at least A port connects with the liquid outlet of the drum, and at least one port connects with the gas entrance of the drum, in described The overheat unit for the superheated steam that can be thermally formed 16.7MPa/566 DEG C is provided with body of heater, it is described to overheat described in unit connection The gas outlet of drum and the high pressure cylinder entrance of the steam turbine, and the overheat unit include heat absorption than for 7.5%~ 8.5% pendant superheater component, absorb heat is than the convection type low-temp superheater for 10.3%~11.8% and heat absorption ratio 10.9%~11.9% convection type high temperature superheater, three are sequentially communicated, and screen described in the gas outlet of the drum Formula superheater assembly, the high temperature superheater connect the high pressure cylinder entrance of the steam turbine.

2. the subcritical electricity generation system of low-heat value gas superhigh temperature as claimed in claim 1, it is characterised in that：The screen formula overheat Device assembly include with the preceding screen superheater of the gas outlet of the drum and connect it is described before shield superheater with it is described low The Late reworking of warm superheater, and sprayed water in being provided with one-level on the stream of the preceding screen superheater and the Late reworking Structure.

3. the subcritical electricity generation system of low-heat value gas superhigh temperature as claimed in claim 2, it is characterised in that：The hyperthermia and superheating Device includes two cold section and a hot arc, and the hot arc is described between cold section positioned at two, and in previous described cold section with it is described Two level water spraying structure is provided with stream between hot arc.

4. the subcritical electricity generation system of low-heat value gas superhigh temperature as claimed in claim 1, it is characterised in that：In in the body of heater Reheater unit is additionally provided with, the reheater unit connects the low pressure (LP) cylinder entrance of the steam turbine and the height of the steam turbine Cylinder pressure exports.

5. the subcritical electricity generation system of low-heat value gas superhigh temperature as claimed in claim 4, it is characterised in that：The reheater machine Group includes installing in the low-temperature reheater in the body of heater, the high pressure cylinder outlet of the steam turbine to the cold reheat Device, the low-temperature reheater is close to the end of the body of heater inner flue.

6. the subcritical electricity generation system of low-heat value gas superhigh temperature as claimed in claim 5, it is characterised in that：The reheater machine Group also includes installing connects the low-temperature reheater and the steamer in the high temperature reheater of the body of heater, the high temperature reheater The low pressure (LP) cylinder import of machine, the high temperature reheater is close to the overheat unit.

7. the subcritical electricity generation system of low-heat value gas superhigh temperature as claimed in claim 5, it is characterised in that：In in the body of heater Economizer unit is provided with, condenser, province's coal are provided with the pipeline between the economizer unit and the steam turbine Device unit include installing in body of heater close to the main economizer of flue end and above the main economizer and with the master The bypass economizer of economizer connection, the condensator outlet are communicated to the main economizer, and the bypass economizer also connects To the liquid inlet of the drum, and the bypass economizer is arranged side by side with the low-temperature reheater, passes through between the two Hot device partition wall separates.

8. the subcritical electricity generation system of low-heat value gas superhigh temperature as claimed in claim 7, it is characterised in that：The body of heater is in institute Stating the end of flue has upper space and lower space, and the main economizer is located in the lower space, the bypass Economizer is located in the upper space with the low-temperature reheater, and passes through between the upper space and the lower space Expansion joint connects.

9. the subcritical electricity generation system of low-heat value gas superhigh temperature as claimed in claim 1, it is characterised in that：In in the body of heater The end of flue is provided with the air preheater with the combustion chamber.

10. the subcritical electricity generation system of low-heat value gas superhigh temperature as claimed in claim 1, it is characterised in that：Each burning Device includes igniting tracheae, Gas Pipe and the combustion-supporting tracheae being socketed successively from inside to outside, and the Gas Pipe is connected with low calorific value coal Gas supply pipe.