CN105299894B - A kind of gas-fired water heating boiler air circulation energy conserving system - Google Patents

A kind of gas-fired water heating boiler air circulation energy conserving system Download PDF

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CN105299894B
CN105299894B CN201510853939.7A CN201510853939A CN105299894B CN 105299894 B CN105299894 B CN 105299894B CN 201510853939 A CN201510853939 A CN 201510853939A CN 105299894 B CN105299894 B CN 105299894B
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type condenser
furnace body
flue
gas
water
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CN105299894A (en
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韩伟
李耀荣
刘蕾
李少良
韩圆圆
邢志敏
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TIANJIN BAOCHENG MACHINERY MANUFACTURING Co Ltd
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TIANJIN BAOCHENG MACHINERY MANUFACTURING Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]

Abstract

The present invention relates to a kind of gas-fired water heating boiler air circulation energy conserving systems, including furnace body, burner, flue, chimney, energy-saving appliance, water-cooling type condenser, second level air type condenser and first order air type condenser, furnace body one end is equipped with, under spaced two burners, the furnace body other end is formed with exhanst gas outlet and is sealedly connected with flue, the outlet of flue is connected to vertical chimney, the energy-saving appliance of two-stage sequence setting is installed in the flue between furnace body and chimney, chimney is sequentially installed with water-cooling type condenser from bottom to top, second level air type condenser and first order air type condenser;In chimney lower part side, connection is equipped with an air blower, and the exhaust outlet of the air blower is connected to the air inlet of combustor of furnace body by closing pipe line.The present invention is stable, safe and reliable, power output is sufficient, exhaust gas temperature is low, high-efficient, flue gas emission index reaches, and more meets market development needs.

Description

A kind of gas-fired water heating boiler air circulation energy conserving system
Technical field
The invention belongs to the equipment in city central heating field, especially a kind of gas-fired water heating boiler air circulation energy conservation system System.
Background technique
This equipment belongs to the capital equipment in city large-scale centralized heating field, leads for the environmental protection and energy saving that current country advocates Domain large-scale city heating coal changes the gas-fired water heating boiler air circulation energy conserving system that gas engineering uses.With domestic level Continuous improvement, society is gradually stringent to the environmental requirement around living area, and large-scale quotient's house, civilian house were small in the past Area generallys use coal burning water heating heating boiler, and to periphery living area, there are more serious dust, poison gas to pollute, and city is usually It shrouds among fog flue dust.To improve city people's living standard, city starts to advocate Blue Sky Project, on a large scale using combustion Gas hot-water boiler air circulation energy conserving system replaces the coal-burning boiler of high pollution, and dilatation changes on the basis of existing burning coal boiler room It makes.Currently, domestic gas-fired water heating boiler air circulation energy conserving system field is in Rapid development stage, with greater need for constantly bring forth new ideas, Research improves, and uses of the new technology, new material has reached and is more energy-saving and environmentally friendly, adapts to the demand in market.
By the application of nearly 3-4, domestic larger gas heating water boiler tentatively captures domestic market, but to larger Gas fired-boiler be also in research and probe, operating experience feedback and evaluation, lack relevant design experiences, as national standard is to pot Furnace thermal efficiency, flue gas emission NOx value constantly require under harsh environment, original gas-fired water heating boiler air circulation energy conserving system heat Efficiency 95%, NOx have much been not suitable with the renewal speed in standard and market in 120-150mg/Nm3, therefore, in the thermal efficiency, cigarette Gas NOx index, exhaust gas temperature etc. reach the higher main direction of studying for breaking through and becoming larger gas heating water boiler.
By retrieval, the patent document of following near field is found:
A kind of gas fired-boiler or direct-fired machine fume afterheat total heat recovery system and method (CN105066219A), including combustion gas Boiler or direct-fired machine, one or more heat exchangers, air-introduced machine, one or more condensers, heat pump, gas fired-boiler or direct-fired machine are high Warm exhaust gases passes are sequentially connected with heat exchanger, air-introduced machine, condenser, outside the flue gas output end junction chamber of condenser, fume afterheat The connection of recovery system hot water is divided into parallel and/or series connection two ways, parallel way are as follows: hot water return pipe divides two-way to be separately connected Heat exchanger and heat pump, heat exchanger and heat pump output connection heating system.Series system are as follows: hot water return pipe connects heat pump, heat pump Water outlet connect heat exchanger, heat exchanger output connection heating system.The present invention is complete by the fume afterheat of gas fired-boiler or direct-fired machine Portion recycles, and for heating, health hot water, moisturizing heating and other technique applications, reaches energy conservation, consumption reduction, emission reduction purpose.
A kind of superconductive gas-fired boiler of energy-efficient normal-pressure horizontal (CN104913498A), including it is interior furnace tube, outer furnace tube, curved Head, flue, heat pipe, inlet tube and outlet tube and sewage pipe;The interior furnace tube is arranged in outer furnace tube, sets between interior furnace tube and outer furnace tube It is equipped with blind rivet, and is provided with burner opening in interior furnace tube;The flue is to be provided on flue by elbow connection structure Heat pipe, and flue outlet is connected on flue;The outer furnace tube, flue and heat pipe are installed in the clad plate of built-in perlite It is interior;The energy-efficient superconductive gas-fired boiler of normal-pressure horizontal, multiple smoke-box welding are distributed appropriate super heat-conductive pipe, super heat-conductive pipe technology It may not only be applied to the recycling of tail portion waste heat, be more rationally applied on boiler combustion cell structure, increase radiation of burner hearth and to spreading Heat area improves the thermal efficiency;In addition the continuous 90 degree of turn designs of flue reduce flue gas flow rate rationally, reduce to heat superconducting The erosive wear of pipe extends the service life of heat pipe and boiler.
By comparison, the technology contents of present patent application and technology disclosed above and the prior art are all had more very much not Together, there is better thermal efficiency and energy saving.
Summary of the invention
It is an object of the invention in place of overcome the deficiencies in the prior art, provide a kind of simple structure and reasonable design, efficiently Gas-fired water heating boiler air circulation energy conserving system energy saving, easy to maintain.
The present invention solves its technical problem and adopts the following technical solutions to achieve:
A kind of gas-fired water heating boiler air circulation energy conserving system, it is characterised in that: including furnace body, burner, flue, cigarette Chimney, energy-saving appliance, water-cooling type condenser, second level air type condenser and first order air type condenser, the installation of furnace body one end There are upper and lower spaced two burners, the furnace body other end is formed with exhanst gas outlet and is sealedly connected with flue, the outlet of flue It is connected to vertical chimney, the energy-saving appliance of two-stage sequence setting is installed, chimney is under in the flue between furnace body and chimney It is sequentially installed with water-cooling type condenser, second level air type condenser and first order air type condenser upwards;Under chimney The connection of portion side is equipped with an air blower, and the exhaust outlet of the air blower is connected to the air inlet of combustor of furnace body by closing pipe line; The intracorporal flue gas of furnace by being discharged in furnace body, successively by two-stage energy-saving appliance, water-cooling type condenser, second level air type condenser with And first order air type condenser, finally it is discharged by chimney.
Moreover, being successively fixed with outer fin panel casing, convection current from left to right in furnace body between upper drum and lower drum Fin panel casing in middle fin panel casing and burner hearth, fin panel casing and burner hearth inner membrance in the outer fin panel casing, convection current Successively interval is fixedly mounted with formula water-cooling wall from left to right;Also, it uniformly gathers between fin panel casing in outer fin panel casing and convection current Second convection bank is installed, uniformly gathers between fin panel casing in fin panel casing and burner hearth in convection current and is equipped with first Convection bank;The first convection current there are smoke inlet between fin panel casing and the inner wall of solid in burner hearth, at the smoke inlet Tube bank arranges to form oblique 45 ° with fin panel casing in burner hearth;The fin panel casing in the smoke inlet farther out convection current of one end There are gaps to form turning channel between inboard wall of furnace body, and guidance is passed through most after half-turn by the second convection bank by flue gas It is discharged into flue eventually.
Moreover, longitudinal gap is equipped with multiple convection current side detection doors on the furnace body on the outside of outer fin panel casing.
Moreover, longitudinal gap is provided with multiple burner hearth sides peephole on furnace body.
Moreover, being equipped with second level air type condenser and the condensation of first order air type along number from bottom to top in flue tail The input terminal of device, first order air type condenser is connected to cold air inlet, the output end communication seals of first order air type condenser One end of snorkel, the input terminal of the other end connection secondary air type condenser of sealing ventilation pipe, secondary air type condenser Output end be connected to hot-blast outlet;Flue gas initially passes through second level air type condenser and once exchanges heat, using first order air type Condenser carries out secondary heat exchange, forms counterflow heat exchange.
Moreover, the heat exchanger tube of air type condenser is all made of 304 stainless steel tubes of Φ 40 × 1.5.
The advantages and positive effects of the present invention are:
1, structure of the invention design will be in view of thermal stability, the combustion heat aerodynamic stability of large-scale furnace structure Property, avoid furnace equipment resonance qualitly, it is also necessary to carry out furnace body thermodynamic computing, each equipment flue gas resistance calculates, water circulation is dynamic in furnace The research and calculating of the multiple types, more science such as power calculating, the discharge calculating of tube wall temperature calculation and check, safety valve, are a complexity Comprehensive mathematical models.It surveys boiler complete machine and runs output load 73.86MW, 37.38 DEG C of exhaust gas temperature, efficiency reaches 108.39%, NOx monitoring reach 60mg/Nm3, and two test detection datas prove that this product 70MW gas-fired water heating boiler is efficient Environmental protection and energy saving, technologically advanced, indices are all better than national standard.
2, the increase of this large-sized boiler height, and SZS type gas fired-boiler upper drum does not have the support of major diameter down-comer, The nearly 30 tons of weight of upper drum is all uniformly born by monowall tube and convection tube, through checking the stress data of every root canal, Convection tube quantity is supported by increasing, reduces vertical load suffered by single pipe, increases caliber and wall thickness (thick-walled pipe of φ 60 × 4) Pipe strength and rigidity are improved, to support overweight upper drum to solve the problems, such as nose heave structural instability.
3, convection bank of the invention all uses in-line pipe to arrange structure, using the thick-walled pipe of φ 60 × 4, transverse pitch 200mm, longitudinal pitch 90mm.Trembling of the pipe under airflow function in order to prevent, middle section is connected with band steel between longitudinal pipe, is made Every comb is connected as one, and greatly strengthens the rigidity of pipe.The horizontal spacing of 200mm is to guarantee that lower flue gas flow rate is set The wide smoke corridor of meter facilitates installation and maintenance repair though decreasing to pipe heat exchange efficiency.In addition, first and second It is respectively kept with space for maintenance after in front of convection bank area and is equipped with inspection door, is more convenient the service work during shutdown of boiler. Consider that boiler operatiopn initial stage furnace coolant-temperature gage is low, burning load is small, condensed water will certainly be generated in furnace body, therefore, in tube bank two Side membrane wall extreme lower position is equipped with hot well and delivery pipe
4, the present invention changes the structure for causing cigarette speed to be mutated in furnace, is at the uniform velocity turned using flue gas and low speed is by technology, kept away Exempt from flue gas and be partially formed violent flow-disturbing to cause furnace body vibration problem, it is longitudinally short with ultralow convection current cigarette fast (11-13m/s), convection tube Fin platoon bundling technique solves thin and tall pipe unstable characteristic, increases stud with large area outside membrane wall and rigid transverse and longitudinal beam is reinforced Roomy membrane wall rigidity solves its thin-walled eardrum effect problem, reduces furnace body vibration.
5, the present invention obtains comprehensively as the film-type water-cooling wall technique generally used on large-scale water-tube boiler in this project Using all outer wall coils, furnace internal partition wall pipe all realize membrane wall, and manufacture difficulty increase brings furnace body thermal stability, heat preservation Leakproofness greatly improves, meanwhile, the design of no fire resisting furnace wall, not only furnace body weight substantially reduces, moreover, not using high pollution It is horizontal to improve product energy conservation and environmental protection indirectly for the refractory material that highly energy-consuming is produced.
6, the present invention uses deep condensation formula multi-group heat exchanger structure, it is by water-cooling type energy-saving appliance+water-cooling type condenser+sky Exhaust gas temperature, can be down to 30 DEG C or so, nearly 80% water vapour in flue gas is made to be condensed into water, centralized recovery by cold mould condenser composition It utilizes.
7, present invention employs high smoke temperature area forced water circulation, the mixed type water of low smoke temperature area natural water circulation recycles knot Structure passes through the water chamber partition being arranged in upper and lower drum, control in the hearth region of high temperature, the heat pipe of 700 DEG C of smoke temperature area above Recirculated water processed it is orderly flow through each heating surface tube, so that its guarantee is reached national boiler hydrodynamics and calculate in the safety of standard recommendation Water speed is risen and declined, that is, can guarantee the safe and reliable operation of heat pipe without overheating;And it is below to 700 DEG C of flue-gas temperature Low-temperature space heat-exchanging tube bundle uses natural water circulation mode, and being heated that situation voluntarily distributes by pipe is raising and lowering, this temperature The pipe in region will not generate gasification to form scale, safely may be used experience have shown that even if water flow momentary freeze occurs It leans on.
8, the present invention has selected two super high-leveled and difficult technologies of low-NOx combustor of upper and lower arrangement, compares separate unit burner arrangement, It makes full use of every one-inch space of big chamber design, guarantees the heat radiation uniformity of each heating surface of burner hearth, flame is in burner hearth Degree of filling reaches optimum state, and super low-NOx combustor is enable preferably to play ultralow NOx combustion performance;Also, it realizes double Two machine cofiring of burner and single machine single fire, widen load range of boiler further.
9, using combustor external flue gas recirculating technique, the flue gas of boiler tail 15% or so is withdrawn into burner It is interior, by its flame mixing can not burning fume come retarded combustion reduce flame temperature, combustion with meagre oxygen in the way of and it is burned (combustion intermediate product HCN consumes O to reduction reaction in journey2), it is generated to further decrease NOx, which fires in 70MW Verifying can reduce NOx and generate nearly 30% on gas boiler.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention;
Fig. 2 is the top view of Fig. 1;
Fig. 3 is the structure sectional view of burner hearth part;
Fig. 4 is the sectional view along A-A of Fig. 3;
Fig. 5 is energy-saving appliance structural schematic diagram;
Fig. 6 is the bottom view of Fig. 5;
Fig. 7 is the structural schematic diagram of water-cooling type condenser;
Fig. 8 is the structural schematic diagram of air type condenser;
Fig. 9 is the overall appearance schematic diagram of the embodiment of the present invention.
Detailed description of the invention: 1 furnace body, 2 chimneys, 3 first order air type condensers, 4 second level air type condensers, 5 water-cooling types Condenser, 6 two net water inlet pipes, 7 two net outlet pipes, 8 flues, 9 energy-saving appliances, 10 energy-saving appliance drip pipes, 11 boiler blow-offs Pipe, 12 lower drum movable supports, 13 burners, 14 1 net water outlets, 15 1 net water inlets, 16 air blowers, 17 sealing ventilation pipes, 18 cold air inlets, 19 hot-blast outlets;
101 water inlet headers, 102 water outlet headers, 103 upper collecting chambers, 104 burner hearth gantry pipe fin panel casings, 105 burner hearth sides are seen Fire hole, 106 lower headers, 107 furnace body drip pipes, water chamber partition in 108 lower drums, 109 lower drums, 110 second convection current It restrains, 111 first convection banks, fin panel casing on the left of 112 burner hearths, fin panel casing in 113 convection current, 114 outer film-type water-coolings Door is detected in wall, water chamber partition in 115 upper drums, 116 upper drums, 117 inner flue gas of the stove entrances, 118 convection current sides;
121 rotating stands, 122 adjust mandril;
901 energy-saving appliance upper collecting chambers, 902 energy-saving appliance heat exchanger tubes, 903 energy-saving appliance fins, 904 cappings, 905 energy-saving appliance next parts Case;
501 condenser heat-exchange pipes, 502 condenser fins, 503 reinforcing ribs, 504 condenser fixed frames.
Specific embodiment
The invention will be further described with reference to the accompanying drawing and by specific embodiment, and following embodiment is descriptive , it is not restrictive, this does not limit the scope of protection of the present invention.
A kind of gas-fired water heating boiler air circulation energy conserving system, including furnace body 1, burner 13, flue 8, chimney 2, energy conservation Device 9, water-cooling type condenser 5, second level air type condenser 4 and first order air type condenser 3, furnace body one end is equipped with Upper and lower spaced two burners, the furnace body other end are formed with exhanst gas outlet and are sealedly connected with flue, and the outlet of flue connects Be connected to vertical chimney, be equipped in the flue between furnace body and chimney two-stage sequence setting energy-saving appliance, chimney from it is lower to On be sequentially installed with water-cooling type condenser, second level air type condenser and first order air type condenser.The intracorporal cigarette of furnace Gas is successively empty by two-stage energy-saving appliance, water-cooling type condenser, second level air type condenser and the first order by being discharged in furnace body Gas type condenser, finally by the discharge of upper chimney end.
For the ease of maintenance furnace body and environment, furnace body lower end is equipped with a boiler water blow-down pipe 11 convenient for the dirt in discharge burner hearth Object;The connection of furnace body lower end is equipped with a furnace body drip pipe 107, for the condensed water of furnace body generation to be discharged;Two-stage energy conservation Device lower end is connected with an energy-saving appliance drip pipe 10, for the condensed water of energy-saving appliance generation to be discharged.
For the ease of adjusting furnace body angle, multiple lower drum movable supports 12 are installed at furnace body lower end interval.
In order to guarantee flue gas emission, in chimney lower part side, connection is equipped with an air blower 16, adjusts the gas in flue To smoke stack emission speed, the exhaust outlet of the air blower is connected to the air inlet of combustor of furnace body by closing pipe line, thus by boiler The flue gas of tail portion 15% or so is withdrawn into burner, using its flame mixing can not burning fume come retarded combustion reduce flame temperature Degree, combustion with meagre oxygen.
Two-stage energy-saving appliance lower end passes through pipeline connection to a net water inlet 15, the pipeline connection furnace body of energy-saving appliance upper end respectively The network of rivers is eventually connected to the net water outlet 14 that furnace body upper end is installed and is discharged;Water-cooling type condenser is connected separately with two nets Water inlet pipe 6 and two net outlet pipes 7.
The specific structure of furnace body is shown referring to attached drawing 3 to 4,
It is illustrated with direction shown in attached drawing 3, the main body of furnace body is a cube body structure, and inboard wall of furnace body is uniformly installed There is one layer of burner hearth gantry pipe fin panel casing 104, one horizontal longitudinally disposed lower drum 109 be installed in furnace body lower end side, The horizontal two sides of the lower drum, which are spaced, is fixed with lateral lower header 106;
The corresponding furnace body upper end of lower drum is equipped with a upper drum 116, and the horizontal two sides of the upper drum, which are spaced, is fixed with cross To upper collecting chamber 103, the upper collecting chamber pass through respectively pipeline connection have into water header 101 and water outlet header 102, the water outlet header connect Lead to a net water outlet 14;
Outer fin panel casing 114 is successively fixed in furnace body between upper drum and lower drum from left to right, in convection current Fin panel casing 112 in fin panel casing 113 and burner hearth, fin panel casing and burner hearth in the outer fin panel casing, convection current Successively interval is fixedly mounted with interior fin panel casing from left to right;Also, in outer fin panel casing and convection current between fin panel casing uniformly It gathers and the second convection bank 110 is installed, peace of uniformly gathering between fin panel casing in fin panel casing and burner hearth in convection current Equipped with the first convection bank 111;
There are smoke inlet 117 between fin panel casing and the inner wall of solid in burner hearth, first pair at the smoke inlet Fin panel casing arranges to form oblique 45 ° in flowing bundle and burner hearth, and inclination angle buffers flue gas and stablizes flow velocity;Farther out apart from smoke inlet There are gaps to form turning channel between fin panel casing and inboard wall of furnace body in the convection current of one end, and guidance is by flue gas through half-turn Afterwards by the second convection bank by eventually arriving at flue;
The nearly 30 tons of weight of upper drum is all uniformly born by monowall tube and convection tube in the present embodiment, passes through increase Convection tube quantity is supported, vertical load suffered by single pipe is reduced.All membrane wall pipes and convection tube all use the thickness of φ 60 × 4 Wall pipe, not only increases the intensity of single pipe, while also improving resistance to corrosion, extends the service life of boiler entirety. Fin between the membrane wall pipe band steel thick using 30mm wide, 6mm, two-sided and tube welding can reinforce the intensity of membrane wall and resistance to High temperature capabilities reduce influence of the thermal stress to membrane wall.Refractory brickwork or coagulation have thoroughly been abandoned in the application of membrane type wall technique The use of native partition wall, installation is easier, and economic and environmental benefit is more preferable.
Water chamber partition 115 in the upper drum being arranged in upper drum, water chamber partition 108 in the lower drum being arranged in lower drum, Control loop water it is orderly flow through each heating surface tube, so that its guarantee is reached the safety that national boiler hydrodynamics calculates standard recommendation Raising and lowering water speed guarantees the safe and reliable operation of heat pipe without overheating;
On the furnace body on the outside of outer fin panel casing longitudinal gap installation there are three convection current side detect door 118, with convection current There are three burner hearth side peepholes 105 for longitudinal gap setting on the other side furnace body that side examines door opposite.
It in order to adjust furnace body angle, is rotatably installed on a rotating stand 121 in lower drum, the installation of the furnace body lower end other side There is an adjusting mandril 122, swing of the adjusting mandril extension and contraction control furnace body in certain angle.
It is shown energy-saving appliance structural schematic diagram referring to attached drawing 5 to attached drawing 6, energy-saving appliance includes energy-saving appliance upper collecting chamber 901, energy conservation Device lower header 905, energy-saving appliance heat exchanger tube 902 and energy-saving appliance fin 903, energy-saving appliance upper collecting chamber and energy-saving appliance lower header are upper and lower Spaced and parallel setting is communicated with more energy-saving appliance heat exchanger tubes uniformly at intervals between energy-saving appliance upper collecting chamber and energy-saving appliance lower header 902, the flue gas in flue is passed through by the gap outside energy-saving appliance heat exchanger tube, and the water in flue gas and energy-saving appliance heat exchanger tube carries out heat friendship It changes, S30408 stainless steel tube of the energy-saving appliance heat exchanger tube using the acid corrosion-resistant of φ 38 × 3, the high-frequency welding outside energy-saving appliance heat exchanger tube The energy-saving appliance fin 903 of S30408 stainless steel material is wound, pipe arranges transverse pitch 80mm, longitudinal pitch 100mm, every grade of energy-saving appliance Assemble integral in factory, scene directly lifting is in place, significantly simplicity mounting process;
Energy-saving appliance lower header one end is connected to a net water inlet 15, and energy-saving appliance lower header other end co-axial seal is fixed with capping 904, energy-saving appliance upper collecting chamber passes through the heat exchanger tube of pipeline connection furnace body.
The present embodiment uses two-stage energy-saving appliance, heating surface total amount is up to nearly more than 2900 square meters, more than boiler body by Hot face total amount controls exit gas temperature within 80 DEG C, and essentially boiler blow-down water temperature adds 10 DEG C, improves boiler efficiency about 3.5%.
Water-cooling type condenser, including condenser fixed frame 504, condenser heat-exchange pipes 501, condensation are shown referring to attached drawing 7 Device fin 502, two net water inlet pipes 6 and two net outlet pipes 7, condenser fixed frame are the rectangular frame of horizontal cross setting, Upper end is fixed with two net outlet pipes on the right side of condenser fixed frame, and lower end is fixed with two net water inlet pipes on the right side of fixed frame, is condensing Device fixed frame upper end is fixed with the condenser heat-exchange pipes of more snakelike in-line arrangements, and the both ends of condenser heat-exchange pipes are respectively communicated with two Net water inlet pipe and two net outlet pipes, water (flow) direction in condenser heat-exchange pipes is opposite with flue gas flow direction to form counterflow heat exchange;This reality It applies and uses four heat exchanger tubes being arranged uniformly at intervals shown in example, heat exchanger tube carries out five half-turns.It changes in order to further increase The heat exchange area of heat pipe, the condensation of the condenser heat-exchange pipes high-frequency welding winding S30408 stainless steel material in the middle part of fixed frame Device fin, this city embodiment are more conducive to condensed water, flue dust and rust piece using the structure type of the vertical fin of horizontal tube and wash away and fall off, The cleaning of heat-transfer surface is kept, the horizontal snakelike in-line comb form of counterflow heat exchange is used.Condenser heat-exchange pipes material still uses The heating surface total amount of S30408 stainless steel, single-stage condenser is up to more than 3360 square meters, can control exit gas temperature 40 DEG C with Interior, essentially two net return water temperatures add 5-8 DEG C, improve boiler efficiency nearly 8.2%.
In order to guarantee structural strength, the staggered reinforcing rib 503 of a plurality of transverse and longitudinal is fixed between condenser heat-exchange pipes.
Referring to the raising of two net return water temperature of dead season shown in attached drawing 8, is considered, there is air-cooled condenser preferably auxiliary to make With, arrange two-stage large-scale air cooling device, specifically: air type condenser 4 He in the second level is installed along number from bottom to top on chimney First order air type condenser 3, the input terminal of first order air type condenser are connected to cold air inlet 18, the condensation of first order air type One end of the output end communication seals snorkel 17 of device, the input of the other end connection secondary air type condenser of sealing ventilation pipe The output end at end, secondary air type condenser is connected to hot-blast outlet 19;Flue gas initially passes through second level air type condenser and once changes Heat carries out secondary heat exchange using first order air type condenser, forms counterflow heat exchange form, can effectively reduce exhaust gas temperature again 5-9 DEG C, boiler efficiency nearly 1.3%, while the hot wind that can be 20 DEG C or so by cold air heating are improved, burning and NOx's are conducive to Control.Consider that it is 304 stainless to be all made of Φ 40 × 1.5 for air cooler thin-wall tube acid-resistant corrosion, the heat exchanger tube of air type condenser Steel pipe, both ends tube sheet use 16mm thickness ND steel plate, and Intermediate Gray anti-swirl pot, welding form overall package, outer casing is 6mm thickness ND Steel plate.
Condensation water ph value is up to 3.7-4.2 and holds faintly acid, to reduce the corrosion to condenser tube, using 06Cr19Ni 10 (S30408 stainless steel) fin tube materials.For the service life for extending energy-saving appliance and condenser heating surface, tubing and fin are complete Portion uses stainless steel material.Meanwhile the not subjected to pressure portion that the shell steel plate and connection flue etc. of energy-saving appliance are directly contacted with condensed water Part also uses ND steel plate to make, and improves energy-saving appliance whole service life to reduce cost.
Although disclosing the embodiment of the present invention and attached drawing for the purpose of illustration, those skilled in the art can be managed Solution: do not departing from the present invention and spirit and scope of the appended claims in, various substitutions, changes and modifications be all it is possible, Therefore, the scope of the present invention is not limited to the embodiment and attached drawing disclosure of that.

Claims (5)

1. a kind of gas-fired water heating boiler air circulation energy conserving system, it is characterised in that: including furnace body, burner, flue, chimney, Energy-saving appliance, water-cooling type condenser, second level air type condenser and first order air type condenser, furnace body one end are equipped with Upper and lower spaced two burners, the furnace body other end are formed with exhanst gas outlet and are sealedly connected with flue, and the outlet of flue connects Be connected to vertical chimney, be equipped in the flue between furnace body and chimney two-stage sequence setting energy-saving appliance, chimney from it is lower to On be sequentially installed with water-cooling type condenser, second level air type condenser and first order air type condenser;
In chimney lower part side, connection is equipped with an air blower, and the exhaust outlet of the air blower is connected to the combustion of furnace body by closing pipe line Burner air inlet;
The intracorporal flue gas of furnace in furnace body by being discharged, successively by two-stage energy-saving appliance, water-cooling type condenser, the condensation of second level air type Device and first order air type condenser, are finally discharged by chimney;
Second level air type condenser and first order air type condenser, the first order are installed along number from bottom to top in flue tail The input terminal connection cold air inlet of air type condenser, the one of the output end communication seals snorkel of first order air type condenser End, the input terminal of the other end connection secondary air type condenser of sealing ventilation pipe, the output end of secondary air type condenser connect Logical hot-blast outlet;Flue gas initially passes through second level air type condenser and once exchanges heat, and carries out using first order air type condenser Secondary heat exchange forms counterflow heat exchange.
2. gas-fired water heating boiler air circulation energy conserving system according to claim 1, it is characterised in that: in upper drum under Outer fin panel casing is successively fixed in furnace body between drum from left to right, membrane type in fin panel casing and burner hearth in convection current Water-cooling wall, successively interval is solid from left to right for fin panel casing in fin panel casing and burner hearth in the outer fin panel casing, convection current Dress;Also, it uniformly gathers between fin panel casing in outer fin panel casing and convection current and the second convection bank, film in convection current is installed It uniformly gathers between fin panel casing in formula water-cooling wall and burner hearth and the first convection bank is installed;In burner hearth fin panel casing with There are smoke inlet between three-dimensional inner wall, fin panel casing arranges shape in the first convection bank and burner hearth at the smoke inlet At oblique 45 °;It is formed and is turned there are gap between fin panel casing and inboard wall of furnace body in the smoke inlet farther out convection current of one end Curved channel, guidance by flue gas after half-turn by the second convection bank by being ultimately discharged into flue.
3. gas-fired water heating boiler air circulation energy conserving system according to claim 2, it is characterised in that: in outer film-type water-cooling Longitudinal gap is equipped with multiple convection current side detection doors on furnace body on the outside of wall.
4. gas-fired water heating boiler air circulation energy conserving system according to claim 2, it is characterised in that: longitudinal on furnace body It is arranged at intervals with multiple burner hearth sides peephole.
5. gas-fired water heating boiler air circulation energy conserving system according to claim 1, it is characterised in that: air type condenser Heat exchanger tube be all made of 304 stainless steel tubes of Φ 40 × 1.5.
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CN105627563A (en) * 2016-03-16 2016-06-01 高诗白 Heating equipment of condensation type gas-fired boiler with multiple annular cavities
CN109974303B (en) * 2019-04-16 2024-04-26 廊坊一萍锅炉保养工程有限公司 Energy-saving device for gas-fired hot water boiler

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GB2087523B (en) * 1980-11-14 1984-07-18 Foster Wheeler Power Prod Modular package boiler
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CN202547095U (en) * 2012-05-03 2012-11-21 西安交通大学 Water circulation structure of post-positioned boiler drum auxiliary forced circulation angular tube
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