CN111998325B - Split assembled natural gas fired boiler - Google Patents
Split assembled natural gas fired boiler Download PDFInfo
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- CN111998325B CN111998325B CN202010906927.7A CN202010906927A CN111998325B CN 111998325 B CN111998325 B CN 111998325B CN 202010906927 A CN202010906927 A CN 202010906927A CN 111998325 B CN111998325 B CN 111998325B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 239000003345 natural gas Substances 0.000 title claims abstract description 14
- 239000012528 membrane Substances 0.000 claims abstract description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000007789 gas Substances 0.000 claims abstract description 34
- 238000001816 cooling Methods 0.000 claims abstract description 28
- 238000000926 separation method Methods 0.000 claims abstract description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 23
- 239000003546 flue gas Substances 0.000 claims description 23
- 238000009413 insulation Methods 0.000 claims description 14
- 239000000779 smoke Substances 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 28
- 238000001704 evaporation Methods 0.000 abstract description 11
- 230000008020 evaporation Effects 0.000 abstract description 11
- 230000003247 decreasing effect Effects 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 abstract 9
- 235000017491 Bambusa tulda Nutrition 0.000 abstract 9
- 241001330002 Bambuseae Species 0.000 abstract 9
- 235000015334 Phyllostachys viridis Nutrition 0.000 abstract 9
- 239000011425 bamboo Substances 0.000 abstract 9
- 239000003245 coal Substances 0.000 description 6
- 238000009434 installation Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003915 air pollution Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
- F22B21/02—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from substantially straight water tubes
- F22B21/12—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from substantially straight water tubes involving two or more upper drums and two or more lower drums, e.g. with crosswise-arranged water-tube sets in abutting connections with drums
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
- F22B21/34—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers
- F22B21/341—Vertical radiation boilers with combustion in the lower part
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
- F23J13/08—Doors or covers specially adapted for smoke-boxes, flues, or chimneys
Abstract
The utility model provides a natural gas boiler is fired to components of a whole that can function independently assembled, which comprises a furnace body, an energy-saving appliance, condenser and combustor, six of furnace body are water-cooling membrane type wall structure, left side and right side are provided with left boiler section of thick bamboo convection subassembly and right boiler section of thick bamboo convection subassembly respectively in the furnace body, the furnace body top is equipped with the separation boiler section of thick bamboo, separation boiler section of thick bamboo upper portion is connected with the top of left boiler section of thick bamboo convection subassembly and right boiler section of thick bamboo convection subassembly respectively through left steam guide pipe and right steam guide pipe, separation boiler section of thick bamboo lower part is connected with the bottom of left boiler section of thick bamboo convection subassembly and right boiler section of thick bamboo convection. According to the invention, the number of convection bank modules can be increased or decreased according to the tonnage of the boiler to match with the heating surface, so that the purposes of adjusting the evaporation capacity and the heating area of the assembled boiler in a modularized proportion are achieved, the load changes and the exhaust gas temperature is relatively unchanged, and the conditions of low-temperature corrosion and large water gushing caused by excessive water carried by the exhaust gas due to too low temperature of the exhaust gas are avoided.
Description
Technical Field
The invention belongs to the technical field of energy conservation and environmental protection of boilers, and particularly relates to a split assembly type natural gas fired boiler.
Background
For a long time, coal is always used as a main energy source in China, a coal-fired boiler is used in a large amount, coal smoke type air pollution is formed, and particularly in haze weather which frequently occurs in recent years, the energy policy and the energy structure of China are further promoted to be transformed as soon as possible. Natural gas is used as clean fuel, which becomes an important development energy source for changing air pollution in China, a boiler is used as an energy consumption household, the boiler actively responds to national policies, changes coal into gas of boiler fuel in time, reduces coal consumption, increases the proportion of a natural gas boiler, and the natural gas boiler is also carried out from small tonnage to large tonnage and high efficiency boilers along with the deep promotion of the policy of changing coal into gas, mainly carried out in two directions, one is a pure bulk boiler, the national model is SHS type, the popular saying is that all small parts forming the boiler are transported to a user use site and then assembled into the boiler for use, the installation period is long, the cost is high, the volume is huge, the air leakage rate is high, the boiler thermal efficiency is lower, and the load regulation difficulty is higher; the other direction is to develop a compact modular assembled boiler, the national model is SZS type, the boiler is assembled according to modules in a boiler manufacturer and then transported to the site, the modules are connected in an abutting mode, the water and electricity of a user can be used after being connected, the installation time is short, the cost is low, the product quality is high, the load adjustment difficulty is high, the air leakage rate of the boiler is low after a full-membrane wall structure is adopted, and the thermal efficiency of the boiler is high. Based on the factors, under the current conditions, when a small and medium natural gas-fired boiler (the evaporation capacity of the boiler is less than 220 t/h), the natural gas-fired boiler with the SZS type structure is better in market popularity than the SHS type structure, the current situation of more coal and less natural gas in China is considered, the large and ultra-large natural gas-fired boiler does not have great demand in China at present, and for the SZS type assembled boiler, because the small and medium-sized boiler suitable for the market is developed, the large and ultra-large natural gas-fired boiler is vigorously developed in nearly 10 years, the traditional structure of the boiler mainly comprises two parts, one side of the boiler is an offset hearth, and the front end part of the hearth is provided with a burner; the other side is provided with a superheater and a convection bank or only the convection bank; the peripheries of the two parts are all sealed by water-cooled membrane walls, and the boiler looks like an English letter D in appearance, so the boiler is called a D-type boiler.
In the process of upsizing the D-type boiler, two outstanding problems occur, firstly, because the structure of the boiler is too compact, the convection bank and the hearth of the boiler can not be too large, and after the tonnage of the boiler is increased, the quality requirement of the boiler steam is also high, but the upper and lower drums for connecting the convection bank can not be too large, so that if the steam quality of the boiler is improved, the diameter of the upper drum needs to be increased, and because the boiler is delivered integrally, the transportation size limits the height increase of the D-type boiler, therefore, the method for increasing the diameter of the drum is not feasible, the restrictions of the convection bank, the hearth, the drum, the transportation and the like are integrated, so that the upsizing process of the D-type boiler meets the technical bottleneck, secondly, along with the market popularization of the natural gas boiler, the proportion of the demand diversity of users is larger, and especially the requirement of the variable load of the boiler is higher, under the condition of large tonnage and small load, because the fuel of the boiler is natural gas, if the load of the boiler is too low, the burner can be well adjusted, but the heating area of the boiler is adaptive to the normal load of the boiler, so that the exhaust gas temperature of the boiler is too low, the tail part of the boiler is seriously corroded under the condition, the heating surface of the tail is quickly corroded and leaked, meanwhile, the condensed water in the exhaust gas is very large, and the boiler becomes a drainage ditch, so that the energy conservation and the environmental protection are not enough. These all seriously affect the production of users, increase the investment of users and waste manpower, material resources and financial resources.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the split assembled natural gas fired boiler which is assembled on site, convenient to transport, large in boiler tonnage, reliable in load variation performance, more energy-saving and more environment-friendly.
In order to solve the technical problems, the invention adopts the following technical scheme: a split-assembly natural gas fired boiler comprises a boiler body, an energy saver, a condenser and a burner, six surfaces of the boiler body are of water-cooling membrane type wall structures, mounting holes are formed in the water-cooling membrane type wall on the front side of the boiler body, the burner sprays flame into a hearth through the mounting holes, a left convection edge membrane type wall and a right convection edge membrane type wall are respectively arranged on the left side and the right side in the boiler body, a left convection heat exchange cavity is formed between the left convection edge membrane type wall and the water-cooling membrane type wall structure on the left side of the boiler body, a left drum convection assembly is arranged in the left convection heat exchange cavity, a right convection heat exchange cavity is formed between the right convection edge membrane type wall and the water-cooling membrane type wall structure on the right side of the boiler body, a right drum convection assembly is arranged in the right convection heat exchange cavity, a cavity formed between the left convection edge membrane type wall and the right convection film type wall is a hearth, a separation drum is arranged above the boiler body, the upper part of the separation drum is respectively connected with the tops of the left drum convection assembly and the right drum convection assembly through a left steam guide pipe and a right drum convection assembly, the lower part of the separation drum is connected with the bottoms of the left drum convection assembly and the right drum convection assembly through a left water return pipe and a right water return pipe respectively, tail gas discharge ports communicated with the rear end of the hearth are formed in the right side of the rear end of the left convection heat exchange cavity and the left side of the rear end of the right convection heat exchange cavity respectively, the front end of the left drum convection assembly is communicated with the front end of the right drum convection heat exchange cavity and is connected with an inlet of an energy saver through a first heat insulation flue, and an outlet of the energy saver is connected with an inlet of a condenser through a second heat insulation flue.
The left drum convection assembly comprises an upper left drum, a lower left drum and a left convection tube bank, the upper end of the left convection tube bank is connected to the bottom of the upper left drum, the lower end of the left convection tube bank is connected to the bottom of the lower left drum, the lower end of the left steam guide tube is connected with the upper left drum, and the lower end of the left water return tube is connected with the lower left drum.
The right drum convection component comprises a right upper drum, a right lower drum and a right convection tube bank, the upper end of the right convection tube bank is connected to the bottom of the right upper drum, the lower end of the right convection tube bank is connected to the bottom of the right lower drum, the lower end of the right steam guide tube is connected with the right upper drum, and the lower end of the right water return tube is connected with the right lower drum.
The front side portion is provided with a guide membrane type wall parallel to a front side water-cooling membrane type wall of the furnace body, the left side and the right side of the guide membrane type wall are connected with the left convection side membrane type wall and the right convection side membrane type wall respectively, a guide channel is formed between the front side water-cooling membrane type wall of the furnace body and the guide membrane type wall, the guide membrane type wall is provided with a supporting hole corresponding to the front and the back of the mounting hole, a burner is arranged in the mounting hole and penetrates through the guide channel and the supporting hole backwards to extend into the furnace body, the left side of the front end of the right convection heat exchange cavity is communicated with the right end of the guide channel, the right side of the front end of the left convection heat exchange cavity is communicated with the left end of the guide channel, the front side portion of the left side water-cooling membrane type wall of the furnace body is provided with a smoke outlet corresponding to the left and the right of the guide channel, and the left side of the smoke outlet is connected with a first insulation flue.
The left tail gas discharge port and the right tail gas discharge port are both provided with at least one set of flue gas quantity adjusting mechanism; each set of flue gas quantity adjusting mechanism comprises an upper horizontal rail, a lower horizontal rail and a rectangular adjusting plate, a water-cooling film type wall at the rear side of the furnace body is provided with a rear strip guide hole which is through from inside to outside along the vertical direction on the flat steel at the corresponding position of the tail gas discharge port, the flat steel at the rear end part of the convection side membrane type wall is provided with a front strip guide hole corresponding to the front and the rear strip guide hole in the vertical direction, the upper horizontal rail and the lower horizontal rail are respectively arranged at the top and the bottom in the furnace body, the rear ends of the upper horizontal rail and the lower horizontal rail are butted with the upper end of the rear strip guide hole, the front ends of the upper horizontal rail and the lower horizontal rail are butted with the upper end of the front strip guide hole, the upper side edge and the lower side edge of the rectangular adjusting plate are respectively connected in the upper horizontal rail and the lower horizontal rail in a sliding manner, the rear side edge of the rectangular adjusting plate penetrates through the rear strip guide hole backwards to stretch out of the furnace body and is provided with a push-pull handle, and the water-cooling membrane type wall at the rear side of the furnace body is provided with a high-temperature-resistant sealing structure matched with the rectangular adjusting plate in a sliding sealing manner.
By adopting the technical scheme, the 'III' -shaped assembled boiler (in the overlooking state, in the III-shaped shape) which can be modularly designed, manufactured and installed is researched and developed, so that the boiler can increase and decrease the heating area in a modularized and proportional manner according to the tonnage of the boiler, the boiler also comprises an adjustable boiler structure which is formed by a relatively fixed heating surface structure and can adjust the heating surface in a proportional manner, a left boiler tube convection assembly and a right boiler tube convection assembly are respectively arranged on the left side and the right side of a boiler body, a hearth is arranged in the middle, the convection tube bundles on the two sides are formed by a structure that vertical water pipes are inserted between an upper boiler tube and a lower boiler tube, the convection tube bundles are shaped like lantern tubes to form a convection tube bundle module, the hearth is a closed space surrounded by a left convection side membrane wall formed by a water discharge pipe on the right side edge of the left convection tube bundle, a right convection side membrane wall formed by a water discharge pipe on the left side edge of the right convection tube bundle, a guide flow membrane wall and a water cooling membrane wall on the rear side of the boiler body, the left upper drum, the left lower drum, the right upper drum and the right lower drum only play roles of connecting the convection bank and distributing water supply, a separation drum with larger volume for separating steam-water mixture is arranged right above the furnace body, and the separation drum is connected with the convection bank module and the water-cooling membrane wall of the furnace body through a steam guide pipe and a return pipe to form steam-water circulation. The number of the convection bank modules can be increased or decreased in proportion according to the requirement of the tonnage of the boiler, so that the tonnage of the boiler and the heating surface can be matched arbitrarily.
The flame sprayed by the burner heats the water-cooled membrane walls on the six sides of the hearth, the water flow in the water-cooled membrane walls circulates in the upper boiler barrel and the lower boiler barrel, the generated flue gas enters the left convection heat exchange cavity and the right convection heat exchange cavity from the tail gas discharge ports on the left side and the right side of the rear end of the hearth respectively and exchanges heat with the water flow in the left convection tube bundle and the right convection tube bundle, the flue gas which is further absorbed in the left convection heat exchange cavity directly enters the first heat insulation flue from the front side, the flue gas which is further absorbed in the right convection heat exchange cavity firstly enters the flow guide channel and then enters the first heat insulation flue from the front side of the left convection heat exchange cavity, then enters the energy saver, then enters the condenser through the second heat insulation flue, and finally is discharged into the atmosphere.
The tail gas discharge port on the left side and the tail gas discharge port on the right side are both provided with at least one set of flue gas volume adjusting mechanism, the number of convection bank corresponds to the number of adjusting mechanism, when the boiler is in full load operation, the rectangular adjusting plate is completely drawn out backwards, and a sealing door used for sealing the rear elongated guide hole is arranged on the water-cooling membrane type wall on the rear side of the boiler body, so that no flue gas leakage is ensured. When the evaporation capacity changes, the rectangular panel is pulled backwards along the upper horizontal rail and the lower horizontal rail through the push-pull handle according to the size of the variable quantity, the cross section area of a tail gas discharge port can be adjusted for a single convection heating surface, the tail gas discharge port can be completely blocked, smoke is not allowed to pass through the flue to wash the heated area of the membrane wall of the part, each heated channel (tail gas discharge port) can be arbitrarily blocked for a plurality of convection heating surfaces, the change of the heated area and the evaporation capacity is consistent, the heated area of the boiler and the flow cross section area of the smoke are increased or decreased through the adjustment of the air quantity adjusting mechanism, the heated area of the boiler and the evaporation capacity of the boiler are arbitrarily matched and adjusted according to the proportion, and the phenomenon that the smoke exhaust temperature of the boiler is too low due to the fact that the boiler is still fixed with a large heated area due to too small evaporation capacity of the boiler is avoided, and a large amount of condensed water is generated when the temperature of the smoke in the smoke is lower than the dew point temperature, thereby the serious corrosion condition appears when the heating surface at the tail part of the boiler is soaked in water.
The guide membrane wall and the water-cooling membrane wall on the front side of the furnace body form a guide channel and also have the function of supporting and installing a cylindrical combustor.
In summary, the design scheme of the invention can achieve two purposes: the number of the convection bank modules can be increased or decreased according to the tonnage of the boiler to be matched with a heating surface, the convection bank modules can be independently manufactured, installed and transported, independent water circulation can be realized, and the purposes of adjusting the evaporation capacity and the heating area of the assembled boiler in a modularized proportion are achieved; secondly, by adjusting the rectangular adjusting plate of the tail gas discharge port at the rear side of the convection tube bundle modules when the boiler operates, the heating area and the flue gas channel when the load of the boiler changes can be matched, the purpose of relatively unchanging the exhaust gas temperature due to the change of the load is achieved, and the situation that the flue gas carries too much water due to too low flue gas temperature, so that low-temperature corrosion and large water gushing are caused is avoided.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is an enlarged view at A in FIG. 2;
fig. 4 is a schematic elevation view of a rectangular adjustment plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1-4, the split-assembly natural gas fired boiler of the invention comprises a boiler body 1, an economizer 2, a condenser 3 and a burner 4, six surfaces of the boiler body 1 are all water-cooled membrane wall structures, the water-cooled membrane wall at the front side of the boiler body 1 is provided with a mounting hole 5, the burner 4 sprays flame into a hearth 6 through the mounting hole 5, the left side and the right side in the boiler body 1 are respectively provided with a left convection edge membrane wall 7 and a right convection edge membrane wall 8, a left convection heat exchange cavity is formed between the left convection edge membrane wall 7 and the water-cooled membrane wall structure at the left side of the boiler body, a left drum convection assembly is arranged in the left convection heat exchange cavity, a right convection heat exchange cavity is formed between the right convection edge membrane wall 8 and the water-cooled membrane wall structure at the right side of the boiler body 1, a right drum convection assembly is arranged in the right convection heat exchange cavity, a cavity formed between the left convection edge membrane wall 7 and the right convection edge membrane wall 8 is a hearth 6, a separation drum 9 is arranged above the furnace body 1, the upper part of the separation drum 9 is respectively connected with the tops of the left drum convection assembly and the right drum convection assembly through a left steam guide pipe 10 and a right steam guide pipe 11, the lower part of the separation drum 9 is respectively connected with the bottoms of the left drum convection assembly and the right drum convection assembly through a left water return pipe 12 and a right water return pipe 13, tail gas discharge ports 14 communicated with the rear end part of the furnace 6 are respectively arranged on the right side of the rear end of the left convection heat exchange cavity and the left side of the rear end of the right convection heat exchange cavity, the front end of the left drum convection assembly is communicated with the front end of the right drum convection assembly and is connected with an inlet of the energy saver 2 through a first heat insulation flue 15, and an outlet of the energy saver 2 is connected with an inlet of the condenser 3 through a second heat insulation flue 16.
The left drum convection assembly comprises a left upper drum 17, a left lower drum 18 and a left convection bank 19, the upper end of the left convection bank 19 is connected to the bottom of the left upper drum 17, the lower end of the left convection bank 19 is connected to the bottom of the left lower drum 18, the lower end of the left steam guide pipe 10 is connected with the left upper drum 17, and the lower end of the left water return pipe 12 is connected with the left lower drum 18.
The right drum convection component comprises a right upper drum 20, a right lower drum 21 and a right convection bank 22, the upper end of the right convection bank 22 is connected to the bottom of the right upper drum 20, the lower end of the right convection bank 22 is connected to the bottom of the right lower drum 21, the lower end of the right steam guide pipe 11 is connected to the right upper drum 20, and the lower end of the right water return pipe 13 is connected to the right lower drum 21.
The front side part in the hearth 6 is provided with a guide membrane type wall 23 which is parallel to the front side water-cooling membrane type wall of the furnace body 1, the left side and the right side of the guide membrane type wall 23 are respectively connected with a left convection side membrane type wall 7 and a right convection side membrane type wall 8, a guide channel 24 is formed between the front side water-cooling membrane type wall of the furnace body 1 and the guide membrane type wall 23, the guide membrane type wall 23 is provided with a support hole which corresponds to the front and the back of the installation hole 5, the burner 4 is arranged in the installation hole 5 and penetrates through the guide channel 24 and the support hole backwards to extend into the hearth 6, the left side of the front end of the right convection heat exchange cavity is communicated with the right end of the guide channel 24, the right side of the front end of the left convection heat exchange cavity is communicated with the left end of the guide channel 24, the front side part of the left side water-cooling membrane type wall of the furnace body 1 is provided with a smoke outlet which corresponds to the left side of the guide channel 24, and the left side of the smoke outlet is connected with a first insulating flue 15.
The left tail gas discharge port 14 and the right tail gas discharge port 14 are both provided with at least one set of flue gas quantity adjusting mechanism 25; each set of flue gas quantity adjusting mechanism 25 comprises an upper horizontal rail 26, a lower horizontal rail 27 and a rectangular adjusting plate 28, a rear strip guide hole 30 which is through from inside to outside is arranged on a flat steel at the position corresponding to the tail gas discharge port 14 on the water-cooled film type wall at the rear side of the furnace body 1 along the vertical direction, a front strip guide hole 29 which corresponds to the front and the rear of the rear strip guide hole 30 is arranged on the flat steel at the rear end part of the convection side film type wall along the vertical direction, the upper horizontal rail 26 and the lower horizontal rail 27 are respectively arranged at the top and the bottom in the furnace body 1, the rear ends of the upper horizontal rail 26 and the lower horizontal rail 27 are butted with the upper end of the rear strip guide hole 30, the front ends of the upper horizontal rail 26 and the lower horizontal rail 27 are butted with the upper end of the front strip guide hole 29, the upper side edge and the lower side edge of the rectangular adjusting plate 28 are respectively connected in the upper horizontal rail 26 and the lower horizontal rail 27 in a sliding manner, the rear side edge of the rectangular adjusting plate 28 passes through the rear strip guide hole 30 and extends out of the furnace body 1 and is provided with a push-pull handle 31, the water-cooling film wall at the rear side of the furnace body 1 is provided with a high-temperature resistant sealing structure (which is the prior art) in sliding sealing fit with the rectangular adjusting plate 28.
The invention relates to a 'III' -shaped assembled boiler (in a III shape in a overlooking state) which can be modularly designed, manufactured and installed, so that the boiler can increase and decrease the heating area in proportion in a modularized way according to the tonnage of the boiler, the boiler also comprises an adjustable boiler structure which can adjust the heating surface in proportion and is formed by a relatively fixed heating surface structure, a left boiler barrel convection assembly and a right boiler barrel convection assembly are respectively arranged at the left side and the right side of a boiler body 1, a hearth 6 is arranged in the middle, the convection tube bundles at the two sides are formed by a structure that vertical water pipes are inserted between an upper boiler barrel and a lower boiler barrel, the convection tube bundles are shaped like lantern tubes to form convection tube bundle modules, the hearth 6 is a closed space surrounded by a left convection side membrane wall 7 formed by a water discharge pipe at the right side edge of a left tube bundle 19, a right convection side membrane wall 8 formed by a water discharge pipe at the left side edge of a right convection tube bundle 22, a diversion membrane wall 23 and a water cooling membrane wall at the rear side of the boiler body 1, the left upper drum 17, the left lower drum 18, the right upper drum 20 and the right lower drum 21 only play a role in connecting the convection bank and distributing water supply, a separation drum 9 for separating steam-water mixture with larger volume is arranged right above the furnace body 1, and the separation drum 9 is connected with the convection bank module and the water-cooling membrane wall of the furnace body 1 through a steam guide pipe and a return pipe to form steam-water circulation. The number of the convection bank modules can be increased or decreased in proportion according to the requirement of the tonnage of the boiler, so that the tonnage of the boiler and the heating surface can be matched arbitrarily.
The flame sprayed by the burner 4 heats the water-cooled membrane walls on the six sides of the hearth 6, the water flow in the water-cooled membrane walls circulates in the upper and lower drums, the generated flue gas enters the left and right convection heat exchange cavities from the tail gas discharge ports 14 on the left and right sides of the rear end of the hearth 6 respectively, and exchanges heat with the water flow in the left and right convection tube bundles 19 and 22, the flue gas further absorbed by heat in the left convection heat exchange cavity directly enters the first heat insulation flue 15 from the front side, the flue gas further absorbed by heat in the right convection heat exchange cavity enters the diversion channel 24, then enters the first heat insulation flue 15 from the front side of the left convection heat exchange cavity, then enters the economizer 2, then enters the condenser 3 through the second heat insulation flue 16, and finally is discharged to the atmosphere. The double arrows in the figure point to the flue gas flow direction and the single arrows point to the steam water flow direction.
At least one set of flue gas quantity adjusting mechanism 25 is arranged on the left tail gas discharge port 14 and the right tail gas discharge port 14, the number of the convection tube bundles corresponds to the number of the adjusting mechanisms, the rectangular adjusting plate 28 is completely drawn out backwards when the boiler is in full-load operation, and a sealing door for sealing the rear elongated guide hole is arranged on the water-cooling film type wall on the rear side of the furnace body 1, so that no flue gas leakage is ensured. When the evaporation capacity changes, the rectangular panel is pulled backwards along the upper horizontal rail 26 and the lower horizontal rail 27 through the push-pull handle 31 according to the size of the variable quantity, the cross section area of the tail gas discharge port 14 can be adjusted for a single convection heating surface, the tail gas discharge port 14 can be completely blocked, and smoke is prevented from flowing through the flue to wash the heating area of the part of the membrane wall. For a plurality of convection heating surfaces, each heating channel (tail gas discharge port 14) can be blocked at will to ensure that the heating area and the evaporation capacity are consistent in change, the heating area and the flow cross section area of the flue gas of the boiler are increased and decreased through the adjustment of the flue gas capacity adjusting mechanism 25, the heating area and the evaporation capacity of the boiler are matched and adjusted at will according to the proportion, and the phenomenon that the exhaust gas temperature of the boiler is too low due to the fact that the boiler heating surface is still fixed and has a large heating area because the evaporation capacity is too small, water vapor in the flue gas is condensed to generate a large amount of water when the temperature is lower than the dew point temperature, and the serious corrosion condition occurs when the heating surface at the tail of the boiler is soaked in water is avoided.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a natural gas boiler is fired to components of a whole that can function independently assembled, includes furnace body, energy-saving appliance, condenser and combustor, six of furnace body are water-cooling membrane wall structure, and the mounting hole has been seted up to the water-cooling membrane wall of furnace body front side, and the combustor passes through the mounting hole and sprays flame, its characterized in that in to furnace: the left side and the right side in the furnace body are respectively provided with a left convection edge membrane wall and a right convection edge membrane wall, a left convection heat exchange cavity is formed between the left convection edge membrane wall and a water-cooled membrane wall structure on the left side of the furnace body, a left drum convection assembly is arranged in the left convection heat exchange cavity, a right convection heat exchange cavity is formed between the right convection edge membrane wall and the water-cooled membrane wall structure on the right side of the furnace body, a right drum convection assembly is arranged in the right convection heat exchange cavity, a cavity formed between the left convection edge membrane wall and the right convection edge membrane wall is a furnace cavity, a separation drum is arranged above the furnace body, the upper part of the separation drum is respectively connected with the tops of the left drum convection assembly and the right drum convection assembly through a left steam guide pipe and a right steam guide pipe, the lower part of the separation drum is respectively connected with the bottoms of the left drum convection assembly and the right drum convection assembly through a left water return pipe and a right water return pipe, tail gas discharge ports communicated with the rear end part of the furnace cavity are respectively arranged on the right side of the rear end of the left convection cavity and the right convection cavity, the front end of the left drum convection assembly is communicated with the front end of the right drum convection assembly and is connected with the inlet of the energy saver through a first heat insulation flue, and the outlet of the energy saver is connected with the inlet of the condenser through a second heat insulation flue;
the left tail gas discharge port and the right tail gas discharge port are both provided with at least one set of flue gas quantity adjusting mechanism; each set of flue gas quantity adjusting mechanism comprises an upper horizontal rail, a lower horizontal rail and a rectangular adjusting plate, a water-cooling film type wall at the rear side of the furnace body is provided with a rear strip guide hole which is through from inside to outside along the vertical direction on the flat steel at the corresponding position of the tail gas discharge port, the flat steel at the rear end part of the convection side membrane type wall is provided with a front strip guide hole corresponding to the front and the rear strip guide hole in the vertical direction, the upper horizontal rail and the lower horizontal rail are respectively arranged at the top and the bottom in the furnace body, the rear ends of the upper horizontal rail and the lower horizontal rail are butted with the upper end of the rear strip guide hole, the front ends of the upper horizontal rail and the lower horizontal rail are butted with the upper end of the front strip guide hole, the upper side edge and the lower side edge of the rectangular adjusting plate are respectively connected in the upper horizontal rail and the lower horizontal rail in a sliding manner, the rear side edge of the rectangular adjusting plate penetrates through the rear strip guide hole backwards to stretch out of the furnace body and is provided with a push-pull handle, and the water-cooling membrane type wall at the rear side of the furnace body is provided with a high-temperature-resistant sealing structure matched with the rectangular adjusting plate in a sliding sealing manner.
2. A split-package natural gas-fired boiler according to claim 1, wherein: the left drum convection assembly comprises an upper left drum, a lower left drum and a left convection tube bank, the upper end of the left convection tube bank is connected to the bottom of the upper left drum, the lower end of the left convection tube bank is connected to the bottom of the lower left drum, the lower end of the left steam guide tube is connected with the upper left drum, and the lower end of the left water return tube is connected with the lower left drum.
3. A split-package natural gas-fired boiler according to claim 1 or 2, wherein: the right drum convection component comprises a right upper drum, a right lower drum and a right convection tube bank, the upper end of the right convection tube bank is connected to the bottom of the right upper drum, the lower end of the right convection tube bank is connected to the bottom of the right lower drum, the lower end of the right steam guide tube is connected with the right upper drum, and the lower end of the right water return tube is connected with the right lower drum.
4. A split-package natural gas-fired boiler according to claim 3, wherein: the front side portion is provided with a guide membrane type wall parallel to a front side water-cooling membrane type wall of the furnace body, the left side and the right side of the guide membrane type wall are connected with the left convection side membrane type wall and the right convection side membrane type wall respectively, a guide channel is formed between the front side water-cooling membrane type wall of the furnace body and the guide membrane type wall, the guide membrane type wall is provided with a supporting hole corresponding to the front and the back of the mounting hole, a burner is arranged in the mounting hole and penetrates through the guide channel and the supporting hole backwards to extend into the furnace body, the left side of the front end of the right convection heat exchange cavity is communicated with the right end of the guide channel, the right side of the front end of the left convection heat exchange cavity is communicated with the left end of the guide channel, the front side portion of the left side water-cooling membrane type wall of the furnace body is provided with a smoke outlet corresponding to the left and the right of the guide channel, and the left side of the smoke outlet is connected with a first insulation flue.
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| CN113464915B (en) * | 2021-07-08 | 2023-04-14 | 上海工业锅炉(无锡)有限公司 | Modularized multi-boiler-barrel longitudinally-arranged boiler structure |
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| WO1998046938A1 (en) * | 1997-04-11 | 1998-10-22 | Siemens Aktiengesellschaft | Modular boiler |
| CN102200271A (en) * | 2011-05-13 | 2011-09-28 | 江苏双良锅炉有限公司 | Large module assembling water tube boiler |
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