CN107101186B - Gas-fired and oil-fired boiler with composite water-cooled hearth - Google Patents
Gas-fired and oil-fired boiler with composite water-cooled hearth Download PDFInfo
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- CN107101186B CN107101186B CN201710452765.2A CN201710452765A CN107101186B CN 107101186 B CN107101186 B CN 107101186B CN 201710452765 A CN201710452765 A CN 201710452765A CN 107101186 B CN107101186 B CN 107101186B
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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
- F22B21/22—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 of form other than straight or substantially straight
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/101—Tubes having fins or ribs
- F22B37/102—Walls built-up from finned tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/34—Adaptations of boilers for promoting water circulation
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Abstract
The gas-oil fired boiler with the composite water-cooling hearth comprises a boiler body, wherein the right side inside the boiler body is a hearth, a plurality of spiral fin tubes are uniformly arranged on the inner side of a water-cooling membrane wall around the hearth, the water-cooling membrane wall surrounds an outer hearth, the spiral fin tubes surround an inner hearth, the water-cooling membrane wall and the spiral fin tubes form the composite water-cooling hearth in the hearth, each spiral fin tube is arranged in the vertical direction between an upper boiler barrel and a lower boiler barrel, the upper ends of all the spiral fin tubes extend into the upper boiler barrel, and the lower ends of all the spiral fin tubes extend into the lower boiler barrel. The invention reduces the temperature of the hearth and the temperature of the hearth outlet when the volume of the boiler is not increased or even reduced, reduces the generation amount of nitrogen oxides of the thermal type of the boiler, facilitates the arrangement of the superheater and reduces the overall steel consumption of the boiler.
Description
Technical Field
The invention relates to a boiler, in particular to a gas-oil boiler with a composite water-cooled hearth.
Background
For a long time, coal is always used as a main energy source in China, and a large amount of coal-fired boilers are used, so that soot type air pollution is formed, especially in haze weather which occurs more recently, and the energy policy and the energy structure of China are further promoted to be transformed as soon as possible. The current use amount of the coal-fired industrial and domestic boilers in China is huge, and the boiler is an important pollution source in haze weather in China, so that the boiler policy for changing the industrial or domestic coal-fired boilers into fuel oil or natural gas is recently formulated in some large and medium cities in China, so that the outstanding contradiction between the coal-fired boilers and the environment can be solved, the boiler policy is also operable in the east-west transportation background, and the boiler policy of changing the coal into the oil or changing the coal into the gas can keep continuity in the prior art and quite a certain period of time.
At present, in fuel oil and natural gas-fired boilers, the number of SZS fuel oil and natural gas-fired boilers used for industrial and domestic boilers is huge, mainly because the SZS fuel oil and natural gas-fired boilers are simple in structure, high in automation degree, short in production and installation period and particularly high in adaptability of small and medium-sized boilers, the SZS fuel oil and natural gas-fired boilers are popular with users, and the market occupancy is increasing. Along with the increasing limit range and tonnage of coal-fired boilers by the state and local governments, the SZS type boiler has been greatly developed, and the typical structure of the boiler mainly comprises two parts, wherein one side of the boiler is an offset hearth, the end part of the hearth is provided with a burner, the hearth is used as a space for providing fuel combustion, the periphery of the hearth is provided with water-cooled membrane wall heating surfaces which play roles in absorbing heat and sealing, and the heating surfaces mainly absorb radiant heat of flames, so the heating surfaces are called radiant heating surfaces; the other side is provided with a superheater and a convection tube bundle or only a convection tube bundle, the heating surfaces are used for absorbing heat released by the flow of flue gas and are collectively called as convection heating surfaces, and the peripheries of the two parts are all sealed by water-cooled film walls, so that the boiler can be delivered as a whole after being assembled in a boiler manufacturing unit, and the boiler is convenient to install after being on site, shortens the installation time and is convenient for users to use. In the design and use process of the boiler, due to the limitation of structure and transportation, the hearth of the boiler is generally designed to be smaller, so that heat released by fuel during combustion in the hearth can not be timely absorbed by surrounding single-layer membrane water walls, the temperature in the hearth is high and can reach about 1400 ℃, and two main problems occur: firstly, because the temperature is above 1200 ℃, the thermal type nitrogen oxide of the boiler is produced in large quantity, which is contrary to the current environmental protection policy, in order to reduce the production of nitrogen oxide, the combustion only reduces the supply of oxygen as much as possible, so that the fuel combustion is incomplete, a large amount of CO is produced, the fuel is wasted, and the boiler operator is unsafe; secondly, the arrangement of a hearth outlet and a later convection heating surface of the boiler is difficult, and the two aspects are mainly shown as follows: firstly, due to the fact that the flue gas temperature of the hearth outlet is too high, the superheater cannot be arranged at the hearth outlet, burning of the superheater is avoided, the concept of arranging the superheater at the position with the highest flue gas temperature is contrary to the concept that the superheater needs to be arranged at the position with the highest flue gas temperature, and the superheater can be positioned on two sides of the superheater when being installed, so that the superheater is easy to install and check, a part of convection tube bundles for protecting the superheater must be arranged in front of the superheater, namely at the hearth outlet, and only the condition of the superheater facing the outside of a boiler can be observed when the superheater is installed, because the other side is abutted against the hearth film wall, and no method is adopted for positioning and checking; secondly, because the temperature of flue gas at the outlet of the hearth is too high (about 1400 ℃ in some cases), in order to reduce the temperature of flue gas at the outlet of the boiler, convection heating surfaces have to be arranged, which is contrary to the idea that a compact boiler volume needs to be designed for convenient transportation and installation, and as a result, a part of heating surfaces are moved outside the boiler, and the energy-saving heating surfaces of the boiler are increased. For the SZS type fuel oil and gas boiler, due to the limitation of structure and transportation, the heat absorption capacity of a single-layer water-cooling membrane wall arranged around the traditional hearth is limited, so that the temperature in the hearth of the boiler is overhigh and the temperature of the flue gas at the outlet of the hearth is overhigh, the generation of oxynitride is increased due to overhigh temperature in the hearth, the generation of oxynitride can be reduced by adopting a low oxygen supply method, but incomplete fuel combustion is caused, the arrangement of a heating surface is difficult due to overhigh temperature of the flue gas at the outlet of the hearth, the overall steel consumption and the installation difficulty of the boiler are increased, and the energy conservation and consumption reduction of the boiler are not facilitated.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides the gas-oil boiler with the composite water-cooled hearth, which is provided with the spiral fin pipes in the limited space in the hearth to reduce the temperature in the hearth, thereby reducing the generation of nitrogen oxides.
In order to solve the technical problems, the invention adopts the following technical scheme: the gas-oil fired boiler with the compound water-cooled hearth comprises a boiler body, wherein the right side of the inside of the boiler body is a hearth, the right side of the front part of the boiler body is provided with a burner mounting hole, the inner wall around the hearth is provided with a water-cooled membrane wall, the left side of the boiler body is provided with an upper boiler barrel and a lower boiler barrel, the upper boiler barrel and the lower boiler barrel are communicated through a convection tube bundle, a hearth smoke outlet is formed in the rear part of the water-cooled membrane wall on the left side of the hearth, a superheater is arranged between the upper boiler barrel and the lower boiler barrel and at the hearth smoke outlet, the front part on the left side of the boiler body is provided with a boiler smoke outlet, a plurality of spiral fin tubes are uniformly arranged on the inner side of the water-cooled membrane wall around the hearth, the water-cooled membrane wall surrounds the outer hearth, the spiral fin tubes surround the inner hearth, the water-cooled membrane wall and the spiral fin tubes form the compound water-cooled hearth in the hearth, each spiral fin tube is vertically arranged between the upper boiler barrel and the lower boiler barrel, the distance between the spiral fin tubes and the water-cooled membrane wall is larger than the water tube diameter of the water-cooled membrane wall, the upper ends of all the spiral fin tubes extend into the upper boiler barrel, and the lower boiler barrel extend into the length of the upper boiler barrel by 10mm; when the boiler is installed, the spiral fin tube is assembled in place before the water-cooling membrane wall, and the spiral fin tube and the water-cooling membrane wall perform compound water cooling on the hearth, so that the smoke temperature of a smoke outlet of the hearth is controlled below 950 ℃.
The spiral fin tube is composed of a spiral fin tube body and fins, the spiral fin tube body and the fins are integrally formed by adopting a metal material through a hot rolling technology, the spiral fin tube with equal screw pitch is formed through multiple times of rolling, the cross section of the fins is trapezoid, and the fins form spiral lines in the axial direction of the spiral fin tube body.
The device also comprises a pressurizing water spraying device for enhancing the circulating flow speed of the cooling water in the spiral fin tube;
the supercharging water spraying device comprises a first mounting frame, a second mounting frame, two water supply pumps and two water supply pipes, wherein the first mounting frame and the second mounting frame are arranged at the inner bottom of the lower boiler barrel, the two water supply pipes extend into the lower boiler barrel from the rear end part of the lower boiler barrel along the direction parallel to the central line of the lower boiler barrel, the two water supply pipes are respectively arranged on the first mounting frame and the second mounting frame through U-shaped bolts, gaskets and nuts, the front ends of the water supply pipes are plugged, the water inlet at the rear end of each water supply pipe is correspondingly connected with the water outlet of one water supply pump, a control valve positioned outside the boiler body is respectively arranged on the two water supply pipes, the two water supply pipes are communicated through a plurality of connecting pipes, a plurality of spray pipes are connected onto one water supply pipe along the length direction, the spray opening of each spray pipe corresponds to the lower port of one spiral fin pipe, the distance between the spray opening of each spray pipe and the lower port of the spiral fin pipe is 2-4mm, and the inner diameter of the spray opening of each spray pipe is 3-5mm.
The spiral fin tubes are arranged in a way that the direction from the burner mounting hole to the smoke outlet of the hearth gradually changes from sparse to dense to sparse, and the spiral fin tubes and the water tubes of the water-cooling membrane wall are alternately arranged at intervals.
According to the technical scheme, the water cooling film walls around the hearth of the fuel gas boiler are internally provided with the water cooling pipes in bulk, which is equivalent to adding a water cooling hearth on the basis of the original hearth, in order to fully utilize the limited space of the hearth, the arranged water cooling pipes are made of spiral fin pipes by adopting integral hot rolling, the heat absorption area of the flame side is increased, in order not to influence the heat absorption of the water cooling film walls, the fin outer edges of the arranged spiral fin pipes are at least greater than the pipe diameter of a water pipe of the film wall, the spiral fin pipes and the water pipes of the water cooling film walls are arranged at intervals, the number of the spiral fin pipes is reduced to be lower than 950 ℃, the temperature in the hearth can be well controlled, meanwhile, the superheater is arranged at the smoke outlet of the hearth, the phenomenon that the heat absorption capacity of the overheater is too large to cause explosion is avoided, the space of radiation heat exchange in the hearth is fully utilized, the hearth and the volume of the boiler is not increased, the volume of the boiler is maintained, the volume of the boiler tube bundle between the upper boiler and the lower boiler is reduced, and the integral weight of the boiler tube bundle and the boiler is reduced when the same smoke discharging temperature is maintained.
The method for specifically adding the boiler expansion water-cooled hearth comprises the following steps: the invention adopts the integral spiral fin tube preferentially, the spiral fin tube is formed by hot rolling technology and rolling for multiple times, the spiral fin tube body and the fins are integrally formed, the fins and the spiral fin tube body are not welded, therefore, the materials are the same, the fin section is trapezoid, the fins form a spiral line shape in the axial direction of the spiral fin tube body, the structure is favorable for heat diffusion and disturbance during flue gas heat transfer, the heat transfer coefficient of the spiral fin tube is very high, the heat transfer area per unit length is large, and the number of the spiral fin tube arranged in a limited space can be doubled, so that the heated area is increased. Because the oil-gas boiler is provided with the arrangement structure of the upper boiler barrel and the lower boiler barrel, the spiral fin pipes can be directly penetrated between the upper boiler barrel and the lower boiler barrel, the inserted structure is adopted, the upper end parts and the lower end parts of the spiral fin pipes penetrate through the boiler barrel wall and penetrate into the boiler barrel, so that the end parts of the spiral fin pipes in the upper boiler barrel and the lower boiler barrel are deeply buried in water when the boiler is in operation, the safe heat exchange of the upper boiler barrel and the lower boiler barrel in radiation heat exchange is ensured, the spiral fin pipes are connected with the boiler barrel in a sealing welding mode in the boiler barrel, the extending length of the spiral fin pipes into the boiler barrel is not more than 10mm, the outer edges of the fins of the spiral fin pipes arranged in the boiler chamber are at least greater than the pipe diameter of a membrane wall of the boiler chamber, the number of the spiral fin pipes is reduced to be below 950 degrees, on the one hand, the production of nitrogen oxide can be reduced, the safety heat exchange of the boiler barrel is ensured, after the two requirements are met, the inner layer is arranged as much as possible, the number of the spiral fin pipes is arranged near the membrane type of the boiler barrel, and the water-cooled combustion tube is arranged near the membrane-type of the boiler, and the water-cooled combustion tube is arranged at the inner side of the membrane-wall, and the proper number of the fin pipes is not influenced when the inner side of the membrane-cooled combustion tube is arranged.
Because the heat transfer in the hearth belongs to radiation heat transfer and has high heat intensity, in order to increase the safety of water circulation, a pressurizing water spraying device is arranged at the lower port of the spiral fin tube of the inner hearth, a control valve is arranged on a water supply pipe, the control valve is kept fully open in the running process, the water spraying resistance is controlled by the size of a water spraying port, the control valve is closed when a boiler is stopped, a spray tube is arranged on the water supply pipe, the spray opening of the spray tube corresponds to the lower port of the spiral fin tube, the distance between the spray opening of the spray tube and the lower port of the spiral fin tube is kept to be about 3mm, the size of the spray opening of the spray tube is kept to be about 3-5mm, high-pressure water (with the flow speed of about 5 m/s) sprayed out from the spray opening of the spray tube is generally kept, the compensation is provided for the possible shortage of water circulation power of the spiral fin tube, the high reliability of the water circulation of the spiral fin tube is ensured, and the temperature in the hearth is easier to be reduced. In addition, the two water supply pumps and the two water supply pipes are adopted and are connected through the plurality of connecting pipes, so that the flow rate of water sprayed by the spraying pipes can be greatly enhanced, and when one water supply pump fails or overhauls, the other water supply pump can still work continuously, so that the operation of pressurized water is continuously carried out, and the temperature in a hearth is ensured not to fluctuate greatly.
After the composite water-cooled hearth is adopted, if the boiler is provided with the superheater, the superheater can be directly arranged at the hearth outlet, a convection bank is not required to be arranged at the hearth outlet according to the original arrangement mode, and then the superheater is arranged, so that the installation and inspection of the superheater are convenient, the convection bank can be arranged less for the same boiler outlet flue gas temperature, the volume of the boiler is reduced, the overall steel consumption of the boiler is reduced, and the overall performance of the boiler is not reduced.
In summary, the invention reduces the temperature of the hearth and the temperature of the hearth outlet when the volume of the boiler is not increased or even reduced, reduces the generation amount of nitrogen oxides by heating power of the boiler, facilitates the arrangement of the superheater and reduces the overall steel consumption of the boiler.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a left side view of FIG. 1;
FIG. 4 is an enlarged view of the booster water jet apparatus of FIG. 3;
fig. 5 is an enlarged schematic view of the spiral fin tube of fig. 2;
fig. 6 is a cross-sectional view of the fins of the spiral fin tube of fig. 5.
Detailed Description
As shown in fig. 1-6, the gas-oil boiler with the composite water-cooling hearth comprises a boiler body 1, wherein the right side inside the boiler body 1 is a hearth 2, a burner mounting hole 3 is formed on the right side of the front part of the boiler body 1, water-cooling membrane walls 4 are arranged on the inner wall around the hearth 2, an upper boiler barrel 5 and a lower boiler barrel 6 are arranged on the left side of the boiler body 1, the upper boiler barrel 5 and the lower boiler barrel 6 are communicated through a convection tube bundle 7, a hearth smoke outlet 23 is formed on the rear part of the water-cooling membrane walls 4 on the left side of the hearth 2, a superheater 8 is arranged between the upper boiler barrel 5 and the lower boiler barrel 6 and at the hearth smoke outlet 23, a boiler smoke outlet 9 is formed on the front part on the left side of the boiler body 1, a plurality of spiral fin tubes 10 are uniformly arranged on the inner side of the water-cooling membrane walls 4 around the hearth 2, the spiral fin tubes 10 are surrounded into an inner hearth, the water-cooling membrane walls 4 and the spiral fin tubes 10 are formed into the composite water-cooling hearth in the hearth 2, each spiral fin tube 10 is vertically arranged between the upper boiler barrel 5 and the lower boiler barrel 6, the spiral fin tubes 10 extend into the length of the water-cooling membrane tubes 10 to the lower boiler barrel 10, and all the spiral fin tubes 10 extend into the inner tube 10mm from the upper tube 10 to the lower tube 10 and the inner tube 10 is larger than the length of the upper tube 10 is larger than the lower tube 10 is extended into the inner tube 10; when the boiler is installed, the spiral fin tube 10 is assembled in place before the water-cooling membrane wall 4, and the spiral fin tube 10 and the water-cooling membrane wall 4 perform compound water cooling on the hearth 2, so that the smoke temperature of a smoke outlet 23 of the hearth is controlled below 950 ℃.
The spiral fin tube 10 is composed of a spiral fin tube body 11 and fins 12, the spiral fin tube body 11 and the fins 12 are integrally formed by adopting a metal material through a hot rolling technology, the spiral fin tube 10 with equal screw pitch is formed through multiple times of rolling, the cross section of the fins 12 is trapezoid, and the fins 12 form a spiral shape in the axial direction of the spiral fin tube body 11.
Further comprising a booster water jet 13 for enhancing the circulating flow rate of cooling water in the spiral fin tube 10;
the pressurizing water spraying device 13 comprises a first mounting frame 14, a second mounting frame 15, two water supply pumps 16 and two water supply pipes 17, wherein the first mounting frame 14 and the second mounting frame 15 are arranged at the inner bottom of the lower boiler barrel 6, the two water supply pipes 17 extend into the lower boiler barrel 6 from the rear end part of the lower boiler barrel 6 along the direction parallel to the central line of the lower boiler barrel 6, the two water supply pipes 17 are respectively arranged on the first mounting frame 14 and the second mounting frame 15 through U-shaped bolts 18, gaskets and nuts 19, the front ends of the water supply pipes 17 are blocked, the water inlet of the rear end of each water supply pipe 17 is correspondingly connected with the water outlet of one water supply pump 16, a control valve 22 positioned outside the boiler body 1 is respectively arranged on the two water supply pipes 17, the two water supply pipes 17 are communicated through a plurality of connecting pipes 20, a plurality of spray pipes 21 are connected on one water supply pipe 17 along the length direction, the spray opening of each spray pipe 21 corresponds to the lower port of one spiral fin pipe 10, the distance between the spray opening of the spray pipe 21 and the lower port of the spiral fin pipe 10 is 2-4mm, and the inner diameter of the spray opening 21 is 3-5mm.
The spiral fin tube 10 adopts an arrangement mode that the direction from the burner mounting hole 3 to the hearth smoke outlet 23 gradually changes from dense to dense, and the spiral fin tube 10 and the water tube of the water-cooling membrane wall 4 are alternately arranged at intervals.
The water cooling membrane walls 4 around the hearth 2 of the fuel oil and gas boiler are internally provided with water cooling pipes in bulk, which is equivalent to adding a water cooling hearth 2 on the basis of the original hearth 2, the water cooling pipes are arranged by adopting spiral fin pipes 10, the spiral fin pipes 10 are formed by integrally hot rolling, the heat absorption area of flame sides is increased, the heat absorption of the water cooling membrane walls 4 is not influenced, the outer edges of the arranged spiral fin pipes 10 are at least greater than the pipe diameters of water pipes of one membrane wall along the membrane walls, the spiral fin pipes 10 and the water pipes of the water cooling membrane walls 4 are arranged at intervals, the number of the spiral fin pipes 10 is equal to that of the boiler tubes of the boiler, the temperature in the hearth 2 is reduced to below 950 ℃, the temperature can well control the generation of nitrogen oxides, meanwhile, the superheater 8 is arranged at a hearth smoke outlet 23, the boiler tube explosion caused by the fact that the heat load of the superheater 8 is too large, the heat absorption capacity of superheated steam is poor is avoided, the space of radiation heat exchange in the hearth 2 is not required to be increased, the volume of the hearth 2 and the boiler is not required to be increased, the volume of the boiler is maintained, the boiler weight consumption can be reduced, and the whole boiler weight and the boiler weight consumption can be reduced by the boiler tube bundle weight can be reduced by the boiler weight is reduced by the boiler tube bundle weight and the boiler weight is reduced by the boiler weight is the boiler.
The method for specifically adding the boiler expansion water-cooled hearth 2 comprises the following steps: the invention is to add water cooling pipes around the hearth 2 and close to the water cooling film walls 4 to form an internal scattered pipe hearth 2 and the hearth 2 with a composite water cooling structure formed by the original water cooling film walls 4, wherein the internal water cooling pipes can be light pipes or fin pipes, the invention preferentially adopts an integral spiral fin pipe 10, the spiral fin pipe 10 is formed by hot rolling technology through multiple times, the spiral fin pipe body 11 and the fins 12 are integrally formed, the fins 12 and the spiral fin pipe body 11 are not welded, so that the materials are the same, the fins 12 are trapezoid in section, the fins 12 form a spiral shape in the axial direction of the spiral fin pipe body 11, the structure is favorable for heat diffusion and disturbance in flue gas heat transfer, therefore, the heat transfer coefficient of the spiral fin pipe 10 is very high, the heat transfer area per unit length is large, and the quantity of the spiral fin pipe body 11 can be arranged in a limited space, but the heated area is increased by times. Because the oil-gas boiler is provided with the arrangement structure of the upper boiler barrel 5 and the lower boiler barrel 6, the spiral fin tube 10 can be directly penetrated between the upper boiler barrel 5 and the lower boiler barrel 6, the upper end part and the lower end part of the spiral fin tube 10 penetrate through the boiler barrel wall and go deep into the boiler barrel, thus ensuring that the spiral fin tube 10 is deeply buried in water at the end parts of the upper boiler barrel 5 and the lower boiler barrel 6 when the boiler operates, ensuring the safe heat exchange of the upper boiler barrel 5 and the lower boiler barrel 6 when the radiation heat exchange is carried out, the spiral fin tube 10 is connected with the boiler barrel in a sealing welding mode, the length of the spiral fin tube 10 extending into the inside of the boiler barrel is preferably not more than 10mm, the outer edges of the spiral fin tubes 10 arranged inside the hearth 2 are at least larger than the tube diameter of a water tube of one membrane wall from the membrane wall of the hearth 2, the number of the spiral fin tubes 10 is suitable for reducing the temperature inside the boiler hearth 2 below 950 degrees (the temperature can meet radiation heat exchange and reduce the generation of nitrogen oxides on one hand), meanwhile, the strength requirement of the boiler drum is met, after the two requirements are met, the spiral fin tubes 10 of the inner-layer hearth 2 are arranged as much as possible, in order not to influence the combustion temperature of fuel, the arrangement number of the spiral fin tubes 10 is suitably reduced near the burner mounting holes 3, and the spiral fin tubes 10 on the inner side of the water-cooled membrane wall 4 are assembled in place before the water-cooled membrane wall 4 is assembled.
Because the heat transfer in the hearth 2 belongs to radiation heat transfer and has high heat intensity, in order to increase the safety of water circulation, a pressurizing water spraying device 13 is arranged at the lower port of the spiral fin tube 10 of the inner hearth 2, a control valve 22 is arranged on a water supply pipe 17, the control valve 22 is kept fully open in the running process, the water spraying resistance is controlled by the size of a water spraying port, the control valve 22 is closed when a boiler is stopped, a spray tube 21 is arranged on the water supply pipe 17, the spray port of the spray tube 21 corresponds to the lower port of the spiral fin tube 10, the spray port of the spray tube 21 is kept at a distance of about 3mm from the lower port of the spiral fin tube 10, the spray port of the spray tube 21 is kept at a distance of about 3-5mm, the high-pressure water (the flow velocity of the spray port of the spray tube 21 is about 5 m/s) is enabled to be sprayed out, the possible shortage of water circulation power of the spiral fin tube 10 is compensated, the high reliability of the water circulation of the spiral fin tube 10 is ensured, and the temperature in the hearth 2 is easier to reduce. In addition, in the invention, two water supply pumps 16 and two water supply pipes 17 are adopted, and the two water supply pipes 17 are connected through a plurality of connecting pipes 20, so that the flow rate of water sprayed by the spray pipes 21 can be greatly enhanced, and when one water supply pump 16 fails or overhauls, the other water supply pump can still work continuously, thereby leading the operation of pressurized water to be continuously carried out, and ensuring that the temperature in the hearth 2 does not have large fluctuation.
The present embodiment is not limited in any way by the shape, material, structure, etc. of the present invention, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention are all included in the scope of protection of the technical solution of the present invention.
Claims (2)
1. The utility model provides a gas-fired boiler with compound water-cooled furnace, including the boiler body, the inside right side of boiler body is furnace, the combustor mounting hole has been seted up on the anterior right side of boiler body, the inner wall is provided with water-cooled membrane wall all around, boiler body left side is provided with drum and lower drum, it communicates through convection bank to go up drum and lower drum, furnace outlet flue sets up at the left water-cooled membrane wall rear portion of furnace, be provided with the superheater in last drum and lower drum and be located furnace outlet flue department, boiler body left side front portion is provided with boiler outlet flue, its characterized in that: the inner sides of the water-cooling membrane walls around the hearth are uniformly provided with a plurality of spiral fin pipes, the water-cooling membrane walls are surrounded to form an outer hearth, the spiral fin pipes are surrounded to form an inner hearth, the water-cooling membrane walls and the spiral fin pipes form a composite water-cooling hearth in the hearth, each spiral fin pipe is vertically arranged between the upper boiler barrel and the lower boiler barrel, the distance between each spiral fin pipe and the water-cooling membrane wall is larger than the pipe diameter of the water pipe of the water-cooling membrane wall, the upper ends of all the spiral fin pipes extend into the upper boiler barrel, the lower ends of all the spiral fin pipes extend into the lower boiler barrel, and the lengths of the spiral fin pipes extending into the upper boiler barrel and the lower boiler barrel are not more than 10mm; when the boiler is installed, the spiral fin tube is assembled in place before the water-cooling membrane wall, and the spiral fin tube and the water-cooling membrane wall perform compound water cooling on the hearth, so that the smoke temperature of a smoke outlet of the hearth is controlled below 950 ℃;
the device also comprises a pressurizing water spraying device for enhancing the circulating flow speed of the cooling water in the spiral fin tube;
the supercharging water spraying device comprises a first mounting frame, a second mounting frame, two water supply pumps and two water supply pipes, wherein the first mounting frame and the second mounting frame are arranged at the inner bottom of the lower boiler barrel, the two water supply pipes extend into the lower boiler barrel from the rear end part of the lower boiler barrel along the direction parallel to the central line of the lower boiler barrel, the two water supply pipes are respectively arranged on the first mounting frame and the second mounting frame through U-shaped bolts, gaskets and nuts, the front ends of the water supply pipes are blocked, the water inlet at the rear end of each water supply pipe is correspondingly connected with the water outlet of one water supply pump, the two water supply pipes are respectively provided with a control valve positioned outside the boiler body, the two water supply pipes are communicated through a plurality of connecting pipes, a plurality of spray pipes are connected onto one water supply pipe along the length direction, the spray opening of each spray pipe corresponds to the lower port of one spiral fin pipe, the distance between the spray opening of each spray pipe and the lower port of the spiral fin pipe is 2-4mm, and the inner diameter of the spray opening of each spray pipe is 3-5mm;
the spiral fin tubes are arranged in a way that the direction from the burner mounting hole to the smoke outlet of the hearth gradually changes from sparse to dense to sparse, and the spiral fin tubes and the water tubes of the water-cooling membrane wall are alternately arranged at intervals.
2. The gas-fired and oil-fired boiler with composite water-cooled furnace according to claim 1, characterized in that: the spiral fin tube is composed of a spiral fin tube body and fins, the spiral fin tube body and the fins are integrally formed by adopting a metal material through a hot rolling technology, the spiral fin tube with equal screw pitch is formed through multiple times of rolling, the cross section of the fins is trapezoid, and the fins form spiral lines in the axial direction of the spiral fin tube body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710452765.2A CN107101186B (en) | 2017-06-15 | 2017-06-15 | Gas-fired and oil-fired boiler with composite water-cooled hearth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710452765.2A CN107101186B (en) | 2017-06-15 | 2017-06-15 | Gas-fired and oil-fired boiler with composite water-cooled hearth |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107101186A CN107101186A (en) | 2017-08-29 |
| CN107101186B true CN107101186B (en) | 2023-05-12 |
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| CN201710452765.2A Active CN107101186B (en) | 2017-06-15 | 2017-06-15 | Gas-fired and oil-fired boiler with composite water-cooled hearth |
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| CN105485897A (en) * | 2016-01-29 | 2016-04-13 | 青岛全能节能环保锅炉有限公司 | Water-tube boiler achieving internal circulation of flue gas and low-nitrogen combustion control method |
| CN206944114U (en) * | 2017-06-15 | 2018-01-30 | 董磊 | Gas fuel boiler with compound water-cooled furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH04335998A (en) * | 1991-05-13 | 1992-11-24 | Hitachi Zosen Corp | Coal burning boiler tube |
| CN2289998Y (en) * | 1996-09-24 | 1998-09-02 | 阚春三 | Mixed circulating device |
| CN203880676U (en) * | 2014-04-08 | 2014-10-15 | 郑州中鼎锅炉股份有限公司 | Horizontal sub-high pressure double-drum oil-gas dual-purpose boiler |
| CN203963899U (en) * | 2014-07-23 | 2014-11-26 | 陕西鼓风机集团西安锅炉有限责任公司（西安特种汽车厂） | Carbonization gas boiler |
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| CN206944114U (en) * | 2017-06-15 | 2018-01-30 | 董磊 | Gas fuel boiler with compound water-cooled furnace |
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