68 results about "Fire-tube boiler" patented technology

The invention relates to a large horizontal internally fired fire-tube hot-water boiler with an external smoke-water heat exchanger. The large horizontal internally fired fire-tube hot-water boiler comprises a boiler barrel (1), a boiler furnace (2) and a second return convection smoke tube (4). The boiler barrel (1) is horizontally arranged, and the boiler furnace (2) and the second return convection smoke tube (4) are arranged in the boiler barrel (1). The large horizontal internally fired fire-tube hot-water boiler is characterized in that the second return convection smoke tube (4) is arranged below the boiler furnace (2), a burnout chamber (3), a corner smoke chamber (5) and the smoke-water heat exchanger (6) are arranged on the outside of the boiler barrel (1), heat exchange tubes of the smoke-water heat exchanger are third return convection smoke tubes, the burnout chamber (3) is arranged at the rear of the boiler barrel (1), a shell side of the burnout chamber (3) is communicated with the boiler furnace (2) and the second return convection smoke tube (4), the second return convection smoke tube (4) is communicated with the corner smoke chamber (5), and the corner smoke chamber (5) is communicated with the third return convection smoke tubes of the smoke-water heat exchanger. The large horizontal internally fired fire-tube hot-water boiler has the advantages that the horizontal internally fired fire-tube boiler is large and is modularized.

The carbon-free fire tube boiler is a boiler for heating water by combustion of hydrocarbon fuels with oxygen. The boiler includes a housing defining first and second heat transfer stages. At least one oxygen transport reactor is received within the first heat transfer stage. The oxygen transport reactor includes an outer wall and an inner cylindrical ion transport membrane. The membrane receives pressurized air and separates gaseous oxygen therefrom, transporting the oxygen into an annular region between the membrane and the outer wall. The gaseous hydrocarbon fuel is delivered into the annular region for combustion, producing gaseous carbon dioxide and water vapor. A water reservoir is defined within the first and second stages, with the at least one oxygen transport reactor and at least one transfer tube passing therethrough. The carbon dioxide and the water vapor are delivered through the at least one transfer tube for heating water contained therein.

An evacuated tube boiler comprised of one or more evacuated tubes and a header, operatively connected to form a common internal volume. The internal volume further containing a first heating fluid. A conduit system conducting a second heating fluid through the header and first heating fluid. One or more artificial light sources in proximity to the evacuated tubes. In operation, the artificial light sources radiate light and/or thermal energy to the evacuated tubes whereby the first heating fluid is efficiently heated. The conduit system conducts the second heating fluid through the header and first heating fluid, whereby heat from the first heating fluid is transferred to the second heating fluid. The conduit system conducts the second heating fluid to the point of use. The apparatus may be used in a hydronic boiler heating system for heating a dwelling.

The invention relates to the technical field of boilers, in particular to a water-tube boiler achieving internal circulation of flue gas and a low-nitrogen combustion control method. The water-tube boiler achieving internal circulation of the flue gas comprises a boiler wall and a boiler chamber which is communicated with an outlet of a combustor, an outer side water-cooling wall is installed on the side wall of the boiler chamber, an inner side water-cooling wall is installed in the boiler chamber, and a water-cooling interlayer is formed between the outer side water-cooling wall and the inner side water-cooling wall; a flue gas backflow inlet is formed in the end, far away from the outlet of the combustor, of the water-cooling interlayer, and a lower-temperature flue gas backflow outlet is formed in the end, close to the outlet of the combustor, of the water-cooling interlayer; a low-temperature flue gas backflow zone is formed by the water-cooling interlayer, and a high-temperature flue gas radiation zone is formed by the portion, located on the inner side of the inner side water-cooling wall, of the boiler chamber. According to the water-tube boiler achieving internal circulation of the flue gas and the low-nitrogen combustion control method, by means of the circulation mode of flue gas in the boiler chamber, decreasing of combustion temperature is facilitated, generation of nitrogen oxides is reduced, the load of an induced draft fan cannot be increased, the system is easy to control, and combustion stability is good.

The invention relates to the fields of chemical industry, energy saving and environment protection, in particular to an automatic control high temperature waste heat recovery system used in the process of preparing acid by sulphur. The automatic control high temperature waste heat recovery system used in the process of preparing the acid by the sulphur comprises a fire tube boiler, a fire tube boiler steam drum, an economizer 4A, an economizer 3B, an economizer 4C, a low temperature superheater 4A, a high temperature superheater 1B and a connecting pipeline valve for forming the system. Compared with the prior art, the automatic control is adopted and the automatic control high temperature waste heat recovery system used in the process of preparing the acid by the sulphur has high technical requirements on both the arrangement among recovery equipment and the reasonableness of forming the system, is more suitable for the requirements for recovering waste heat generated by a device for preparing the acid by the sulphur in a large scale, has the advantages of investment saving, high heat recovery efficiency, long using period of equipment and capacity of adapting to the requirement of a chemical process device on continuous operation for years, is matched with an automatic control system and has high safety and reliability.

A water-fire tube boiler of a low discharging high-performance vertically-arranged boiler casing type relates to eight boiler series, namely a large or middle water-fire tube grate firing, a chamber combustion, hot-water, steam, and phase-change and distributed type cogeneration boiler. The invention comprises a longitudinal barrel, a crossbar collecting box, a wall-cooling tube, a vertically-arranged boiler casing, a screw-thread fire tube and the like. The invention changes flue direction of current water-fire tube boilers from a longitudinal flue which is horizontally returned in front and back direction to a transversal flue which is vertically returned in up and down direction. Twice large dilatancies are naturally realized before smoke enters into the flue, and the vertically-arranged boiler casing is entirely barely heated in the rear portion of the flue of the boiler. The volume of a furnace and the flue and a radiative-convective heating surface are significantly enlarged with same size and same quantity of steel consumption, a five return journey of a whole forced-circulating waterway for coal and hot water is only provided with a baffle board, and a three journey of a whole forced-circulating waterway for gas (oil) is not provided with any baffle boards. Inlet water roses slowly after entering into the boiler casing, and firstly washes an upper tube sheet, and then enters into a rising tube. The invention eliminates tube explosion, tube-plate fracture and flue abrasion, the initial discharging concentration of smoke is greatly reduced, and consumption of steel and electricity is decreased.

The invention relates to a united acid manufacturing method by utilizing sulfuretted hydrogen and sulphur. The method is characterized in that in a united acid manufacturing production process by utilizing the sulfuretted hydrogen and the sulphur, a fire-tube boiler is adopted at a third section of outlet of a converter and behind an intermediate temperate superheater; the evaporating pressure of the boiler is controlled to be 5.1-5.6Mpa, and the saturation temperature is 265-271 DEG C, the inner wall temperature of a fire tube is improved, and the temperature of the fire tube wall is 265.5-271.4 DEG C, so that the condition that the temperature of the fire tube wall is higher than the dew point temperature of sulfuric acid in the gas is guaranteed, and the dew point temperature in a whole sulfuretted hydrogen working condition is 263 DEG C, so that the dew point corrosion is avoided; meanwhile, two acid manufacturing working conditions of a wet method and a dry method are considered, two fire tube boilers are adopted to be connected in series for operation; when the acid is manufactured by the wet method, the pressure of the two boilers is controlled to be 5.1-5.6Mpa; when the acid is manufactured by a dry method, the dew point of the sulfuric acid in the gas is about 155 DEG C according to the test of the dew point of the sulfuric acid in gas; the two boilers are separated to operate; the pressure of the first boiler is controlled to be 4.0-4.8Mpa; the pressure of the second boiler is controlled to be 1.0-1.8Mpa; and low-pressure steam is directly produced, and the heat is further recovered. With the adoption of the method provided by the invention, the dew point corrosion is avoided, and the use efficiency of process equipment is greatly improved.

The invention discloses a novel industrial boiler with low emission and high energy efficiency, and relates to the series of twenty boilers which are different in fuels and mediums, namely large-scale grate firing: scattered coal, moulded coal and biomass and chamber firing: fuel gas, oil-fired hot water, steam, phase-conversion heat exchange and distributed heat and power cogeneration boilers. The novel industrial boiler comprises a transverse boiler, a transversal and longitudinal container, a water wall tube, a vertical boiler shell, a thread smoke tube, and the like. The invention integrates the advantages of a water-tube boiler, a water-fire tube boiler and a corner-tube boiler, more particularly solves the different defects of three types of boilers; namely, the water-tube boiler has the defects of complicated technology as well as large volume and steel consumption; the water-fire tube boiler has the defects of tube plate crackle, tube explosion, smoke tube abrasion, and the like; the corner-tube boiler has the defects that the technology is complicated technology and the dust deposition at the tail part is difficult to be eliminated; and the invention also greatly improves the difficult problems of the three types of boilers that the initial emission concentration of smoke and dust is higher generally. The invention has the advantages of advanced installation technology and extremely obvious energy conservation and emission reduction.

The invention relates to a counter current heating exchanging water-fire tube boiler capable of saving energy and protecting the environment, which comprises a boiler shell, a containing box, a convection tube, a smoke-fire tube, a smoke separating wall, a combustion chamber and a convection tube flue, wherein high-temperature flue gas with two return trips firstly passes through a position with higher water temperature at the water side of the smoke-fire tube in the boiler shell for exchanging heat, then lower-temperature flue gas with three return trips passes through the convection tube with lower temperature at the water side of the convection tube flue for exchanging heat, and the flue gas is discharged out of the boiler body after the heat exchange; the original downstream heat exchanging means is completely changed; counter current heat exchange is realized; energy sources are saved; carbon dioxide emission is reduced; the purposes of saving energy and protecting the environment are achieved; the counter current heating exchanging water-fire tube boiler can be produced by adopting a normal boiler production technology; and the reconstruction of an existing boiler can be realized by only changing the flow of the flue gas.

The invention discloses a fuel gas combustion system suitable for a fire tube boiler, relates to the technical field of ultralow nitrogen combustion of gas-fired boilers, and aims to solve the technical problem of effectively reducing the NOx emission concentration of the fire tube boiler. The fuel gas combustion system is characterized in that a few of air guns are arranged in the center of a flame stabilizing disc; a plurality of stable combustion air channels are arranged on the periphery of the flame stabilizing disc; a fuel gas gun is arranged on the outer side of the flame stabilizing disc; and the spray orifice of the fuel gas gun stretches out of the throat of a combustor and is outwards in the radial direction. The fuel gas combustion system has the following advantages: the combustion system has excellent stable combustion capacity; the fuel gas sprays outwards in the radial direction to enlarge the covering range of flame and reduce the flame peak temperature by utilizing the boiler hearth to the maximum; and in addition, exhaust gas recycling is generated in the boiler, so that the recycling usage amount of external exhaust gas is reduced, and 30 mg and even less NOx isdischarged.

The invention relates to hot water boilers, in particular to a vertical small-capacity fire-tube boiler. The vertical small-capacity fire-tube boiler is mainly composed of a boiler shell, a smoke exhaust tube, a combustor, a fire tube, an exhaust gas chamber and the like. A traditional water tube and a traditional fire tube are changed innovatively, namely the traditional water tube is replaced with the mode that an outer cavity between a heat preservation outer shell and a heat preservation inner shell is filled with water, so that the area of the heating surface is largely enlarged, no tube explodes, and the service life of the boiler is prolonged relatively. The traditional mode that the fire tube extends back and forth horizontally in the transverse mode is changed into the mode that the fire tube extends back and forth vertically in the longitudinal direction, and the fire tube is almost completely exposed in the water, so that the exhaust smoke flow is lengthened, the heat transfer area is enlarged largely, and the heat transfer efficiency of the boiler is improved exponentially. Exhaust smoke in the boiler can completely wash the inner wall of the fire tube rapidly and longitudinally, and therefore the purposes of economical efficiency, energy conservation, the compact structure, high heating efficiency and the like are achieved.

The invention discloses a smoke gas inlet structure of a fire tube boiler. The smoke gas inlet structure comprises a tube plate, wherein one side of the tube plate is a smoke box side, the other sideof the tube plate is a water path side; the tube hole of each heat exchange tube at the water path side extends into a tube hole of the tube plate; the tube hole of each heat exchange tube is welded,sealed and fixed with the tube hole correspondingly; the tube hole of each heat exchange tube extends into one end, close to the water path side, of the tube hole; the tube hole of each heat exchangetube is welded, sealed and fixed with the inner wall, close to the water path side, of the tube hole; a high-temperature fire-resistant cast layer is arranged between the tube plate and the smoke box;ceramic sleeves which are in one-to-one correspondence to the heat exchange tubes are embedded and fixed in the high-temperature fire-resistant cast layer; one end of each ceramic sleeve communicateswith the smoke box, and the other end of each ceramic sleeve extends into the corresponding heat exchange tube; a ceramic protective sleeve is further arranged in each tube hole; and each ceramic protective tube sleeves the ceramic sleeve in each tube hole. The smoke gas inlet structure has the advantages that a welding seam between the tube plate and the heat exchange tube can be effectively protected, and the fire tube boiler can be guaranteed to safely and reliably operate.

The invention relates to a horizontal fire tube boiler with a gas-gas heat tube heat exchange tube arranged on the tail and belongs to the technical field of heating equipment. The horizontal fire tube boiler comprises a combustor (1), a boiler body (2), a cornering smoke chamber (3) and a coal economizer (4), wherein the combustor (1) is arranged at the front end of the boiler body (2), and the coal economizer (4) is arranged on the top of the boiler body (2). The horizontal fire tube boiler is characterized in that a gas-gas heat tube heat exchanger (5) is additionally arranged behind the coal economizer (4), and the gas-gas heat tube heat exchanger (5) is also arranged on the top of the boiler body (2). By means of the horizontal fire tube boiler, the temperature of smoke can be further lowered, smoke condensation can be even achieved, the latent heat of vaporization is released, the efficiency of the boiler is improved, the temperature of combustion air is increased, and the consumption of fuel is reduced. Furthermore, people do not need to worry about the problem of shutdown overhaul due to gas-gas flow path communication caused by the damage of heat tubes, and the horizontal fire tube boiler can be independently arranged through transformation of the energy-saving technology for an existing boiler.

The invention relates to a full-film type wall water-fire tube boiler. The boiler comprises a hearth which is of a full-film type wall structure, a burner which is fixedly connected to one end of the hearth, a turning smoke chamber which is of a full-film type wall structure, a heat exchanger and a steam drum. An outlet smokestack is arranged on one side of the hearth. One end of the turning smoke chamber is connected with the outlet smokestack, and the other end of the turning smoke chamber is connected with the heat exchanger. The connecting joint between the turning smoke chamber and the outlet smokestack and the connecting joint between the turning smoke chamber and the heat exchanger are each provided with an annular header. A film type wall water-cooled tube of the turning smoke chamber communicates with a shell of the heat exchanger through the annular header located at the position of the heat exchanger. The steam drum communicates with the film type wall water-cooled tube of the turning smoke chamber through the annular header located at the position of the outlet smokestack. Meanwhile, the steam drum directly communicates with a film type wall water-cooled tube of the hearth and forms a circulation heat exchange channel. The full-film type wall water-fire tube boiler includes various structures, boiler capacity covers the full industrial boiler range, and thus the boiler can be widely applied to various conditions where water-fire tube boilers are needed.

The invention relates to a fire-tube boiler main fire tube heat exchange efficiency improving device and a mounting method thereof. The fire-tube boiler main fire tube heat exchange efficiency improving device is good in energy saving effect and does not need to change the main structure and using mode of an existing traditional fire-tube boiler after being mounted. The fire-tube boiler main fire tube heat exchange efficiency improving device comprises an expansion barrel and a plurality of V-shaped heat storage net hopper assemblies. The end openings at the two ends of the expansion barrel are both conical openings with the outer sides wider than the inner sides, and a conical sliding block is arranged in each conical opening. A pull rod is arranged between the two conical sliding blocks, and a nut is arranged at the end of one side of the pull rod. The V-shaped heat storage net hopper assemblies surround the outer circular surface of the expansion barrel, and the sum of the included angles of V-shaped heat storage net hoppers in the V-shaped heat storage net hopper assemblies is 360 degrees. The fire-tube boiler main fire tube heat exchange efficiency improving device has the advantages that firstly, the main structure and using mode of the existing traditional fire-tube boiler do not need to be changed after the heat exchange efficiency improving device is mounted, the modification period of the traditional fire-tube boiler is shortened, and the modification cost is saved; and secondly, the heat exchange efficiency improving device can conduct sufficient heat exchange with high-temperature smoke, and thus the energy saving rate of the modified fire-tube boiler is increased by 20%-30%.

The invention provides a combined screwed pipe water-fire tube boiler and relates to an industrial boiler taking screwed pipes as main heat convection heating surface. The combined screwed pipe water-fire tube boiler comprises a body, a steel frame backplate, a oven wall liner heat preservation, a chain grate stoker, an air collector, a backwater allocating header and a boiler exhaust gas outlet. The body comprises a drum, a left and right side water wall tube assembly, a front arch tube assembly, a back arch tube assembly and a combined screwed pipe assembly. After the backwater allocating header is communicated with the body via a pipe, an total water return pipe of the boiler is conveyed into the boiler via the backwater allocating header and the combined screwed pipe assembly, the boiler allocates a side water wall tube circulating loop comprising left and right side water wall tube assemblies, a front arc-shaped tube circulating loop comprising front arc-shaped tube assemblies and back arc-shaped tube circulating loop comprising back arc-shaped tube assemblies to circulate back to the boiler, the air collector extracts out and pipelines are utilized to transport to users. The combined screwed pipe assemblies composed by high efficient heat exchanger element screwed pipes to an upright arrangement is adopted in convection heat exchanging area on the tail portion of the boiler, material consumption is reduced, module production is adopted in plants, production quality is easy to control, the weight of single assembly unit is light, field mounting is convenient and project duration is short.

The invention relates to a double-flue reversal chamber of a large horizontal fire-tube boiler and belongs to the technical field of heating equipment. The double-flue reversal chamber comprises a cylinder (2), a front tube sheet (1) and a back tube sheet (3). The front tube sheet (1) and the back tube sheet (3) are respectively in butt welding with the cylinder (2). The double-flue reversal chamber is characterized in that the cylinder (2), the front tube sheet (1) and the back tube sheet (3) are all oval and two round holes are symmetrically formed in the left and the right of the front tube sheet (1) and correspond to double flues in a barrel of the horizontal fire-tube boiler respectively. The reversal chamber can not only meet a limiting condition of wall thickness but utilize internal space of the barrel to the utmost extent and accordingly make the output of 35t/h (29MW) possible to the horizontal internal-combustion fire-tube boiler.