CN111197743B - Heat accumulating type M-shaped radiant tube unit and combustion method thereof - Google Patents
Heat accumulating type M-shaped radiant tube unit and combustion method thereof Download PDFInfo
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- CN111197743B CN111197743B CN202010051560.5A CN202010051560A CN111197743B CN 111197743 B CN111197743 B CN 111197743B CN 202010051560 A CN202010051560 A CN 202010051560A CN 111197743 B CN111197743 B CN 111197743B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/12—Radiant burners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
- F23D14/64—Mixing devices; Mixing tubes with injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/82—Preventing flashback or blowback
- F23D14/825—Preventing flashback or blowback using valves
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- Chemical & Material Sciences (AREA)
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Abstract
The invention provides a heat accumulating type M-shaped radiant tube unit and a combustion method thereof, wherein the heat accumulating type M-shaped radiant tube unit comprises the following components: the device comprises a heat accumulating type burner, an M-shaped flame radiant tube and a reversing device for heat accumulating type combustion; the heat accumulating type burner is connected with the M-shaped flame radiation pipe, and the reversing device is connected with the heat accumulating type burner. The heat accumulating type M-shaped radiant tube unit is integrated and integrates combustion, heat transfer, smoke exhaust and heat accumulation; the heat accumulating type combustor can use high-heat-value fuels such as liquefied gas, natural gas, coke oven gas, light oil and the like, and when the heat accumulating type combustor works, air and smoke gas need to be reversed while the fuels do not need to be reversed. Through the mode, the heat accumulating type M-shaped radiant tube unit is integrated, the flame combustion temperature of the heat accumulating type combustor can be effectively reduced, and NO is reduced while fuel is savedxThe temperature uniformity of the wall surface of the radiant tube can be improved, the service life of the radiant tube is prolonged, and the heating quality is improved.
Description
Technical Field
The invention relates to the technical field of industrial heating burners, in particular to a heat accumulating type M-shaped radiant tube unit and a combustion method thereof.
Background
The flame radiant tube is a heating device which utilizes heat generated by gas combustion in the tube and transfers the heat to a heated object in a furnace in a main form of heat radiation through the surface of the heated tube, and at present, the used radiant tubes are mainly divided into two categories: the flame radiant tube is mainly a common heating device of a controllable atmosphere heat treatment furnace, and is also applied to the industries of machinery, textile, food and the like.
In the ferrous and metallurgical industriesThe flame radiant tube in the fields of furnaces and mechanical heat treatment mainly adopts gas fuel with higher heat value, because of the limitation of space in the radiant tube, a lot of heat generated in the combustion process can not be conducted into the furnace, although the cyclic utilization of partial heat can be realized after the heat exchanger is used, combustion air can be preheated to about 550 ℃ in the prior art, but a large amount of effective heat can not be utilized in flue gas, in order to improve the heat efficiency, the existing flame radiant tube is in a W shape, the heat transfer area is larger, the heat efficiency is higher, but the surface temperature difference is larger. P-shaped, high thermal efficiency, good material and high cost. The U-shaped structure has low thermal efficiency. The thermal efficiency of the forms is about 60 percent, but NOxThe emission is higher than the current emission standard.
In the prior art, heat accumulating type combustion is adopted to improve the heat efficiency, generally, combustion air can be preheated to about 800 ℃, fuel spray guns, air and smoke are simultaneously reversed during working, when one fuel spray gun sprays fuel, the other fuel spray gun is closed and NO fuel passes, so that the problems of incomplete combustion, low heat efficiency and the like caused by discharging residual fuel in the spray gun closed and NO fuel passes easily, the head part of the spray gun is easily burnt and coked, the service life of the spray gun is influenced, the uniformity of the wall surface temperature of a radiation pipe is poor, the burning loss of the radiation pipe is serious, and meanwhile, NO generated during the combustion of high-temperature air and fuel is seriousxWill be very high and not meet the current discharge standard of steel and metallurgical industrial furnaces, thus rarely being effectively applied in radiant tubes.
Disclosure of Invention
The invention mainly solves the technical problems that: aiming at the defects of the prior art, the heat accumulating type M-shaped radiant tube unit and the combustion method thereof are provided, which are beneficial to improving the surface temperature uniformity of the radiant tube, prolonging the service life of the radiant tube, improving the comprehensive heat efficiency, saving the fuel consumption, improving the combustion stability of the radiant tube and reducing NOxAnd (4) discharging the amount. Meanwhile, negative pressure environment combustion in the flame radiant tube can be realized, atmosphere control in the furnace is facilitated, the requirement of the existing flame radiant tube heating process is met, the improvement and installation are convenient, and the maintenance and the overhaul are realizedIt is easy.
In order to achieve the above objects and the related contents, the present invention adopts a technical solution: there is provided a regenerative M-shaped radiant tube unit comprising: the device comprises a heat accumulating type burner, an M-shaped flame radiant tube and a reversing device for heat accumulating type combustion; the heat accumulating type burner is connected with the M-shaped flame radiation pipe, and the reversing device is connected with the heat accumulating type burner.
In a preferred embodiment of the invention, the M-shaped flame radiation pipe is formed by a middle combustion pipe and two side flue gas discharge pipes into an M shape; two sides of the heat accumulating type combustor are respectively connected with a left telescopic pipe assembly and a right telescopic pipe assembly, and the front end of the heat accumulating type combustor is connected with a combustion nozzle; the left telescopic pipe component and the right telescopic pipe component are respectively connected with the flue gas discharge pipes on two sides, and the combustion nozzle is connected with the combustion pipe.
In a preferred embodiment of the invention, the cross section of the combustion tube is the same as the sum of the cross sections of the flue gas discharge pipes on both sides.
In a preferred embodiment of the invention, the regenerative burner comprises a regenerative box body and a left air interface and a right air interface and a flue gas interface, wherein the regenerative box body contains two regenerative chambers containing regenerative bodies, the left air interface and the right air interface and the flue gas interface are respectively connected with the two regenerative chambers, and the left air interface and the right air interface and the flue gas interface are connected with the reversing device.
In a preferred embodiment of the invention, a fuel channel for inserting a fuel spray gun is arranged in the heat accumulating type combustor, a left heat accumulating channel and a right heat accumulating channel are arranged on two sides of the fuel channel, the front end of the left heat accumulating channel comprises a left nozzle, and the front end of the right heat accumulating channel comprises a right nozzle; a premixing chamber connected with the fuel channel is arranged in the heat accumulating type combustor, the left nozzle is connected with the premixing chamber through a left mixing channel, the right nozzle is connected with the premixing chamber through a right mixing channel, and the premixing chamber is connected with the combustion nozzle; a left return flue is arranged in the left telescopic pipe assembly, a right return flue is arranged in the right telescopic pipe assembly, the left return flue is connected with the right return flue through a flue gas left-right balance channel, the left return flue is connected with the left nozzle and the left mixing channel, and the right return flue is connected with the right nozzle and the right mixing channel; the left heat accumulation channel and the right heat accumulation channel are respectively connected with the two heat accumulation chambers.
In a preferred embodiment of the invention, the premixing chamber contains an ignition channel and a flame detection channel, an ignition device is installed in the ignition channel, and a flame detector is installed in the flame detection channel.
In a preferred embodiment of the invention, the reversing device consists of two injectors and stop valves arranged on the two injectors, and the two injectors are connected with the left air interface and the right flue interface of the heat accumulating type burner.
In a preferred embodiment of the invention, the bottom of each of the two injectors contains a loose flange for connecting a blower; and the top of the two ejectors is provided with a smoke outlet used for connecting a draught fan.
In a preferred embodiment of the invention, the shut-off valve is a duplex pneumatic flashboard shut-off valve arranged between two injectors or a pneumatic shut-off valve respectively arranged on two injectors.
The combustion method of the heat accumulating type M-shaped radiant tube unit comprises two steps of combustion and smoke exhaust, wherein when the heat accumulating type M-shaped radiant tube unit works, a fuel spray gun is inserted into the fuel channel, and fuel is introduced into a premixing chamber according to a set ignition control method;
during combustion: the loop flange on the reversing device is connected with an external air blower, the cut-off valve is in a closed state, positive pressure air from the air blower enters a left heat storage channel or a right heat storage channel in the heat storage type combustor after being preheated by a heat storage chamber through a left air interface or a right air interface on the heat storage type combustor connected with the air blower, preheated high-temperature air is sprayed out through a left nozzle or a right nozzle, and the flue gas from a left return flue or a right return flue in the heat storage type combustor and flue gas from flue gas discharge pipes on two sides of the M-shaped flame radiation pipe are sprayed and sucked to the left mixing channel or the right mixing channel in the heat storage type combustor, so that the self-circulation backflow of the flue gas is realized, the mixed gas of the air and the flue gas is formed, and the oxygen content in the air is reduced; the low-oxygen air and the fuel sprayed by the fuel spray gun are mixed in a premixing chamber in the heat accumulating type combustor, are ignited by an ignition device inserted in the heat accumulating type combustor, and are observed by a flame detector to be stably combusted at a combustion nozzle at the front end of the heat accumulating type combustor, and finally enter a middle combustion pipe of the M-shaped flame radiation pipe to finish combustion;
during smoke discharge: a loop flange on the reversing device is connected with an external air blower, a cutoff valve is in an open state, and positive pressure air from the air blower is injected through an injector, so that the positions of a left air interface and a flue gas interface or a right air interface and a flue gas interface on the heat accumulating type combustor connected with the air blower are in a negative pressure state; meanwhile, the flue gas discharge pipes on two sides of the M-shaped flame radiation pipe receive flue gas from a middle combustion pipe, the flue gas passes through the left telescopic pipe assembly and the right telescopic pipe assembly, passes through the left return flue and the right return flue in the heat accumulating type combustor, is sucked by negative pressure at the left nozzle or the right nozzle in the heat accumulating type combustor, passes through the left heat accumulation channel or the right heat accumulation channel in the heat accumulating type combustor, enters a heat accumulation chamber on a heat accumulation box body to finish heat accumulation, and is led out by the negative pressure generated by the ejector injection principle at the left air interface, the flue gas interface or the right air interface and the flue gas interface on the heat accumulating type combustor.
The invention has the beneficial effects that:
(1) the M-shaped flame radiation tube adopts a combustion tube with a larger middle section, so that fuel can be fully combusted, and the heat utilization rate is improved; the cross section of the flue gas discharge pipes on the two sides is smaller, so that the flow velocity of the shunted flue gas is uniform, the heat load on the surface of the wall of the radiant tube is uniform, the temperature difference on the surface is small, and the service life of the radiant tube can be prolonged.
(2) The heat accumulating type combustor can realize flue gas self-circulation high-temperature low-oxygen combustion, an independent combustion and smoke exhaust whole body is formed, the whole body is installed outside the furnace body, a turbulence piece does not need to be inserted into a radiant tube to increase the heat efficiency, the reforming and installation are convenient, and the maintenance and the overhaul are easy. And the burning nozzle part of the heat accumulating type burner extends into the pipe, so that the damage to the wall surface of the radiant pipe caused by the flame impact of a burning high-temperature area can be prevented, and the influence of the heat insulation of the furnace wall on the heat transfer of the radiant pipe is reduced.
(3) The reversing device is formed by combining an ejector and a stop valve, air supply and smoke discharge can be realized only by an air blower, the structure is simple, the overall performance is good, and the device is suitable for scattered reversing of radiant tube combustion. And the smoke outlet of the ejector can be conveniently connected with the induced draft fan, negative pressure environment combustion in the flame radiant tube is realized, atmosphere control in the furnace is facilitated, and the requirement of the existing flame radiant tube heating process is met.
Drawings
Fig. 1 is an external structural view of a regenerative M-shaped radiant tube unit according to the present invention;
FIG. 2 is a structural reference drawing of the internal components;
FIG. 3 is a cross-sectional view A-A shown in FIG. 2;
fig. 4 is a schematic view illustrating a combustion method of a heat accumulating type M-shaped radiant tube unit according to the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4;
the parts in the drawings are numbered as follows:
1. the device comprises a heat accumulating type combustor, 2, M-shaped flame radiant tubes, 3, a telescopic tube component, 4, a combustion nozzle, 5, a fuel spray gun, 6, an ignition device, 7, a flame detector, 8 and a heat accumulating type reversing device.
The internal elements in the drawings are numbered as follows:
1-1 part of fuel channel, 1-21 parts of left heat storage channel, 1-22 parts of right heat storage channel, 1-23 parts of left nozzle, 1-24 parts of right nozzle, 1-31 parts of left return flue, 1-32 parts of right return flue, 1-33 parts of left and right flue gas balance channel, 1-41 parts of left mixing channel, 1-42 parts of right mixing channel, 1-5 parts of premixing chamber, 1-6 parts of ignition channel and flame detection channel, 1-9 parts of air and flue gas interface, 2-1 part of combustion pipe, 2-2 parts of left flue gas discharge pipe, 2-3 parts of right flue gas discharge pipe, 3-1 part of left telescopic pipe component, 3-2 parts of right telescopic pipe component, 8-1 part of lap joint flange, 8-2 parts of smoke discharge port.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Referring to fig. 1-5, it should be noted that the drawings provided in this embodiment illustrate the basic concept of the present invention, and the components related to the present invention are drawn according to the number, shape and size of the components in practical implementation. The embodiment of the invention comprises the following steps:
a regenerative M-shaped radiant tube unit, as shown in fig. 1 to 3, comprising: the device comprises a heat accumulating type burner 1, an M-shaped flame radiant tube 2 and a reversing device 8 for heat accumulating type combustion; the heat accumulating type burner 1 is connected with the M-shaped flame radiation pipe 2, and the reversing device 8 is connected with the heat accumulating type burner 1.
As an example, the M-shaped flame radiation pipe 2 is formed into an M shape by a middle combustion pipe 2-1 and flue gas discharge pipes at two sides (a left flue gas discharge pipe 2-2 and a right flue gas discharge pipe 2-3); the sum of the cross section of the combustion pipe 2-1 and the cross sections of the flue gas discharge pipes (the left flue gas discharge pipe 2-2 and the right flue gas discharge pipe 2-3) on the two sides is the same, so that the diameter of the combustion pipe 2 is larger than that of the flue gas discharge pipes (the left flue gas discharge pipe 2-2 and the right flue gas discharge pipe 2-3) on the two sides; the fuel in the combustion pipe 2-1 is fully combusted, the flow velocity of the flue gas in the flue gas discharge pipes (the left flue gas discharge pipe 2-2 and the right flue gas discharge pipe 2-3) at two sides is uniform, the heat load on the wall surface of the radiant pipe is uniform, and the surface temperature difference is small.
As an example, telescopic pipe components 3 (a left telescopic pipe component 3-1 and a right telescopic pipe component 3-2) are respectively connected to two sides of the heat accumulating type burner 1, and a combustion nozzle 4 is connected to the front end of the heat accumulating type burner; the left telescopic pipe component 3-1 is connected with the left smoke discharge pipe 2-2, and the right telescopic pipe component 3-2 is connected with the right smoke discharge pipe 2-3; the combustion nozzle 4 is connected with the combustion pipe 2-1, and the part of the combustion nozzle 4 extends into the pipe, so that the damage of flame impact in a combustion high-temperature area to the wall surface of the radiation pipe can be prevented, and the influence of heat insulation of a furnace wall on heat transfer of the radiation pipe is reduced.
By way of example, the heat accumulating type burner 1 comprises a heat accumulating box body and a left air interface 1 and a right air interface 1-9 and a flue gas interface 9, wherein the heat accumulating box body contains two heat accumulating chambers provided with heat accumulating bodies, the left air interface 1 and the right air interface 1-9 and the flue gas interface 1-9 are respectively connected with the two heat accumulating chambers, and the left air interface 1 and the right flue gas interface 1-9 are connected with the reversing device 8.
As an example, a fuel channel 1-1 for inserting a fuel spray gun 5 is arranged in the heat accumulating type combustor 1, when the heat accumulating type combustor works, the fuel spray gun 5 of different fuels can be inserted into the fuel channel 1-1, the heat accumulating type combustor can be suitable for high-calorific-value fuels such as liquefied gas, natural gas, coke oven gas and light oil, and air and smoke gas need to be reversed while the fuels do not need to be reversed.
The two sides of the fuel channel 1-1 are provided with a left heat storage channel 1-21 and a right heat storage channel 1-22, so that air inlet and smoke exhaust are separated; the front ends of the left heat storage channels 1-21 are provided with left nozzles 1-23 with certain cross angles, and the front ends of the right heat storage channels 1-22 are provided with right nozzles 1-24 with certain cross angles, and the left nozzles 1-23 and the right nozzles are used for ejecting air during combustion and sucking smoke during smoke exhaust.
A premixing chamber 1-5 connected with the fuel channel 1-1 is arranged in the heat accumulating type combustor 1, the left nozzle 1-23 is connected with the premixing chamber 1-5 through a left mixing channel 1-41, the right nozzle 1-24 is connected with the premixing chamber 1-5 through a right mixing channel 1-42, the left mixing channel 1-41 and the right mixing channel 1-42 are converged in the premixing chamber 1-5 at a certain crossing angle, and the premixing chamber 1-5 is connected with the combustion nozzle 4; a left return flue 1-31 is arranged in the left telescopic pipe component 3-1, a right return flue 1-32 is arranged in the right telescopic pipe component 3-2, the left return flue 1-31 is connected with the left nozzle 1-23 and the left mixing channel 1-41, and the right return flue 1-32 is connected with the right nozzle 1-24 and the right mixing channel 1-42; the low-oxygen air burner is used for guiding flue gas in a furnace to the positions of a left nozzle 1-23, a right nozzle 1-24, a left mixing channel 1-41 and a right mixing channel 1-42, forming jet flow by air sprayed from the left nozzle 1-23 or the right nozzle 1-24 during combustion, and guiding the flue gas to the left mixing channel 1-41 or the right mixing channel 1-42 to form low-oxygen air after air and flue gas are mixed. When smoke is discharged, the negative pressure of the left nozzle 1-23 or the right nozzle 1-24 sucks the smoke into the left heat storage channel 1-21 or the right heat storage channel 1-22, and the smoke is discharged from the left/right air and smoke interface 1-9 after heat storage. The left heat accumulation channel 1-21 and the right heat accumulation channel 1-22 are respectively connected with two heat accumulation chambers.
The premixing chamber 1-5 is internally provided with an ignition channel and flame detection channels 1-6, the ignition channel is internally provided with an ignition device 6, the flame detection channels are internally provided with flame detectors 7, and the ignition channel and the flame detection channels can be used interchangeably according to fuel performance.
By way of example, the reversing device 8 consists of two ejectors and a duplex pneumatic flashboard cut-off valve arranged between the two ejectors, and only a blower is needed to realize air supply and smoke discharge; the two ejectors are connected with the left and right air and flue gas interfaces 1-9 of the heat accumulating type burner.
As an example, the bottoms of the two ejectors are provided with a loop flange 8-1 which is used for connecting a blower and switching once every 60s, and a compression cylinder on the reversing device 8 is controlled by a controller to perform reversing operation at regular time.
As an example, the top parts of the two ejectors are respectively provided with a smoke outlet 8-2 which is used for being connected with an induced draft fan to realize negative pressure environment combustion in the M-shaped flame radiant tube 2, once the radiant tube is damaged, combustion smoke can be sucked out by negative pressure, atmosphere control in the furnace is facilitated, and the requirement of the existing flame radiant tube heating process is met.
A combustion method of a heat accumulating type M-shaped radiant tube unit is shown in figures 4 and 5 and comprises two steps of combustion and smoke exhaust, when the combustion method works, a natural gas fuel spray gun 5 is inserted into a fuel channel 1-1, air and smoke need to be reversed, fuel does not need to be reversed, and introduced fuel enters a premixing chamber 1-5 according to a set ignition control method. In the air and flue gas reversing process, the fuel is stopped to be supplied for 2S-4S, so that incomplete combustion of the fuel caused by insufficient air in the reversing process can be avoided.
During combustion: the loop flange 8-1 on the reversing device 8 is connected with an external air blower, a duplex pneumatic plugboard cut-off valve arranged on the reversing device 8 is in a closed state, positive pressure air from the air blower enters a left heat accumulation channel 1-21 or a right heat accumulation channel 1-22 in the heat accumulation burner 1 after passing through a left/right air and flue gas interface 1-9 on the heat accumulation burner 1 connected with the air blower and being preheated by a heat accumulation chamber, high temperature air after being preheated is sprayed out through a left nozzle 1-23 or a right nozzle 1-24, and flue gas from a left return flue 1-31 or a right return flue 1-32 in the heat accumulation burner 1 and flue gas discharge pipes (a left flue gas discharge pipe 2-2 and a right flue gas discharge pipe 2-3) at two sides of the M-shaped flame radiation pipe 2 and from the joint of the left telescopic pipe component 3-1 and the right telescopic pipe component 3-2 is sprayed and sucked to the burner The left mixing channel 1-41 or the right mixing channel 1-42 in the air-conditioning unit 1 realizes the self-circulation backflow of the flue gas, forms the mixed gas of the air and the flue gas, and reduces the oxygen content in the air. The low-oxygen air is mixed with fuel sprayed by a fuel spray gun 5 inserted into a fuel channel 1-1 in a premixing chamber 1-5 in the heat accumulating type combustor 1, is ignited by an ignition device 6 inserted into the heat accumulating type combustor 1, and is observed by a flame detector 7, the fuel and the low-oxygen air are stably combusted in a combustion nozzle 4 at the front end of the heat accumulating type combustor 1, and finally enter a combustion pipe 2-1 in the middle of the M-shaped flame radiation pipe 2 to complete combustion.
During smoke discharge: the loop flange 8-1 on the reversing device 8 is connected with an external air blower, the duplex pneumatic plugboard cut-off valve arranged on the reversing device 8 is in an open state, and positive pressure air from the air blower is injected through an injector, so that the left/right air and smoke interfaces 1-9 on the heat accumulating type combustor 1 connected with the air blower are in a negative pressure state. Meanwhile, the flue gas discharge pipes (the left flue gas discharge pipe 2-2 and the right flue gas discharge pipe 2-3) at two sides of the M-shaped flame radiation pipe 2 receive the flue gas from the middle combustion pipe 2-1, through the left telescopic pipe component 3-1 and the right telescopic pipe component 3-2, and through the left return flue 1-31 and the right return flue 1-32 in the heat accumulating type burner 1, negative pressure is sucked at the left nozzle 1-23 or the right nozzle 1-24 in the heat accumulating type burner 1, and enters a heat accumulation chamber on the heat accumulation box body through a left heat accumulation channel 1-21 or a right heat accumulation channel 1-22 in the heat accumulation type combustor 1 to finish heat accumulation, then the negative pressure generated by the ejector injection principle is led out through the left/right air and flue gas interfaces 1-9 on the heat accumulating type combustor 1.
In summary, it shows that: the invention discloses a heat accumulating type M-shaped radiant tube unit and a combustion method thereof, wherein an external heat accumulating type combustor is adopted for installation, a special structural design is utilized inside the heat accumulating type combustor, air/flue gas and fuel are enabled to run in respective channels according to designed speed, combustion-supporting air is mixed with flue gas sucked in by self circulation to form low-oxygen air, the oxygen content can be reduced to below 15%, then the low-oxygen air is premixed with the fuel for combustion to realize high-temperature low-oxygen combustion, and the purpose of reducing NO is achievedxAnd (4) generating.
In this embodiment, natural gas is used as fuel, and the air and flue gas reversing time is set to 60s, and the test: when the wall surface temperature of the radiant tube is 1000 ℃, the air temperature of the heat accumulating type burner on the heat accumulating type M-shaped radiant tube unit is less than or equal to 750 ℃ after being preheated, and the final flue gas discharge temperature is less than or equal to 120 ℃. Through the test: NOxDischarge amount of<120mg/m3（O2: 8%) emission of CO<50mg/m3（O2: 8%) compared with the existing similar metallurgical industrial furnace NOxHas an emission standard of<150mg/m3（O2: 8%) emission of CO<70mg/m3（O2: 8 percent) can meet the use requirement of the emission standard.
The invention discloses a heat accumulating type M-shaped radiant tube unit and a combustion method thereof. When the device works, air/smoke gas is reversed, fuel does not need to be reversed, and head coking or service life reduction due to high temperature can be avoided when the fuel spray gun stops supplying fuel due to fuel reversing. In addition, the phenomena that fuel is pumped out from a flue to cause fuel waste and the temperature of the heat storage room is too high when the fuel is reversed can not occur. The high-calorific-value fuel can be suitable for liquefied gas, natural gas, coke oven gas, light oil and the like only by replacing the fuel spray gun.
The invention discloses a heat accumulating type M-shaped radiant tube unit which forms an independent whole body, integrates combustion, heat transfer, smoke exhaust and heat accumulation, has good integral performance and is suitable for scattered reversing of radiant tube combustion. And the smoke outlet of the ejector can be conveniently connected with the induced draft fan, negative pressure environment combustion in the flame radiant tube is realized, atmosphere control in the furnace is facilitated, and the requirement of the existing flame radiant tube heating process is met.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships conventionally used to place the products of the present invention, and are only used for convenience of description and simplification of the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value. The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (6)
1. A regenerative M-shaped radiant tube unit, comprising: the device comprises a heat accumulating type burner, an M-shaped flame radiant tube and a reversing device for heat accumulating type combustion; the heat accumulating type burner is connected with the M-shaped flame radiation pipe, and the reversing device is connected with the heat accumulating type burner; the M-shaped flame radiation pipe is formed into an M shape by a combustion pipe in the middle and smoke discharge pipes on two sides; two sides of the heat accumulating type combustor are respectively connected with a left telescopic pipe assembly and a right telescopic pipe assembly, and the front end of the heat accumulating type combustor is connected with a combustion nozzle; the left telescopic pipe assembly and the right telescopic pipe assembly are respectively connected with the flue gas discharge pipes on two sides, and the combustion nozzle is connected with the combustion pipe; the heat accumulating type burner comprises a heat accumulating box body and a left air interface and a right air interface and a flue gas interface, wherein the heat accumulating box body is internally provided with two heat accumulating chambers provided with heat accumulators, the left air interface and the right air interface and the flue gas interface are respectively connected with the two heat accumulating chambers, and the left air interface and the right air interface and the flue gas interface are connected with the reversing device; the sum of the cross section of the combustion pipe and the cross sections of the flue gas discharge pipes on the two sides is the same; the reversing device consists of two ejectors and stop valves arranged on the two ejectors, and the two ejectors are connected with the left and right air and flue gas interfaces of the heat accumulating type burner.
2. A heat accumulating type M-shaped radiant tube unit as claimed in claim 1, wherein a fuel channel for inserting a fuel spray gun is formed in the heat accumulating type burner, a left heat accumulating channel and a right heat accumulating channel are formed on both sides of the fuel channel, a left nozzle is formed at the front end of the left heat accumulating channel, and a right nozzle is formed at the front end of the right heat accumulating channel; a premixing chamber connected with the fuel channel is arranged in the heat accumulating type combustor, the left nozzle is connected with the premixing chamber through a left mixing channel, the right nozzle is connected with the premixing chamber through a right mixing channel, and the premixing chamber is connected with the combustion nozzle; a left return flue is arranged in the left telescopic pipe assembly, a right return flue is arranged in the right telescopic pipe assembly, the left return flue is connected with the right return flue through a flue gas left-right balance channel, the left return flue is connected with the left nozzle and the left mixing channel, and the right return flue is connected with the right nozzle and the right mixing channel; the left heat accumulation channel and the right heat accumulation channel are respectively connected with the two heat accumulation chambers.
3. A heat accumulating M-shaped radiant tube unit as claimed in claim 2, wherein the pre-mixing chamber contains an ignition channel and a flame detection channel, an ignition device is installed in the ignition channel, and a flame detector is installed in the flame detection channel.
4. A regenerative M-shaped radiant tube unit as claimed in claim 1 wherein the bottoms of both said injectors contain a lap flange for connection to a blower; and the top of each ejector comprises a smoke exhaust port used for being connected with an induced draft fan.
5. A regenerative M-shaped radiant tube unit as claimed in claim 1 wherein the cut off valves are duplex pneumatic spile cut off valves installed between two injectors or pneumatic cut off valves installed on two injectors respectively.
6. A combustion method based on a heat accumulating type M-shaped radiant tube unit of any one of claims 1-5, is characterized by comprising two steps of combustion and smoke exhaust, wherein in operation, a fuel spray gun is inserted into a fuel channel, and introduced fuel enters a premixing chamber according to a set ignition control method;
during combustion: the loop flange on the reversing device is connected with an external air blower, the cut-off valve is in a closed state, positive pressure air from the air blower enters a left heat accumulation channel or a right heat accumulation channel in the heat accumulation type combustor after being preheated by a heat accumulation chamber through a left empty and flue gas interface or a right empty and flue gas interface on the heat accumulation type combustor connected with the air blower, preheated high-temperature air is sprayed out through a left nozzle or a right nozzle and is sprayed and sucked into a left mixing channel or a right mixing channel in the heat accumulation type combustor from a left return flue or a right return flue in the heat accumulation type combustor and flue gas from flue gas discharge pipes on two sides of the M-shaped flame radiation pipe, self-circulation backflow of the flue gas is realized, mixed gas of the air and the flue gas is formed, and the oxygen content in the air is reduced; the low-oxygen air and the fuel sprayed by the fuel spray gun are mixed in a premixing chamber in the heat accumulating type combustor, the mixture is ignited by an ignition device inserted in the heat accumulating type combustor, the flame is observed by a flame detector, the fuel and the low-oxygen air are stably combusted in a combustion nozzle at the front end of the heat accumulating type combustor, and finally the fuel and the low-oxygen air enter a middle combustion pipe of the M-shaped flame radiation pipe to finish combustion;
during smoke discharge: a loop flange on the reversing device is connected with an external air blower, a cutoff valve is in an open state, and positive pressure air from the air blower is injected through an injector, so that the positions of a left air interface and a flue gas interface or a right air interface and a flue gas interface on the heat accumulating type combustor connected with the air blower are in a negative pressure state; meanwhile, smoke discharge pipes on two sides of the M-shaped flame radiation pipe receive smoke coming from a middle combustion pipe, the smoke passes through the left telescopic pipe assembly and the right telescopic pipe assembly, passes through a left return flue and a right return flue in the heat accumulating type combustor, is sucked at a left nozzle or a right nozzle in the heat accumulating type combustor by negative pressure, passes through a left heat accumulation channel or a right heat accumulation channel in the heat accumulating type combustor, enters a heat accumulation chamber on a heat accumulation box body to finish heat accumulation, and is led out by the negative pressure generated by an ejector injection principle at a left air interface, a smoke interface or a right air interface and a smoke interface on the heat accumulating type combustor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010051560.5A CN111197743B (en) | 2020-01-17 | 2020-01-17 | Heat accumulating type M-shaped radiant tube unit and combustion method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010051560.5A CN111197743B (en) | 2020-01-17 | 2020-01-17 | Heat accumulating type M-shaped radiant tube unit and combustion method thereof |
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| CN111197743A CN111197743A (en) | 2020-05-26 |
| CN111197743B true CN111197743B (en) | 2022-07-19 |
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| CN2068645U (en) * | 1990-02-20 | 1991-01-02 | 常熟市喷嘴厂 | Heat accumulation self-preheating burner |
| CN2562078Y (en) * | 2002-08-16 | 2003-07-23 | 冶金工业部节能中心常熟喷嘴厂 | Heat stored burner |
| CN101280916A (en) * | 2008-05-14 | 2008-10-08 | 天津市赛洋工业炉有限公司 | Thermal storage type oxygen-enriched combusting method and device |
| CN102252328A (en) * | 2011-07-06 | 2011-11-23 | 重庆赛迪工业炉有限公司 | Radiation tube heater |
| CN102278758A (en) * | 2011-06-17 | 2011-12-14 | 中冶京诚工程技术有限公司 | Heating device of radiant tube |
| CN205780972U (en) * | 2016-06-30 | 2016-12-07 | 李志勇 | Open crossover valve and include the conversion equipment of this switching valve |
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2020
- 2020-01-17 CN CN202010051560.5A patent/CN111197743B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2068645U (en) * | 1990-02-20 | 1991-01-02 | 常熟市喷嘴厂 | Heat accumulation self-preheating burner |
| CN2562078Y (en) * | 2002-08-16 | 2003-07-23 | 冶金工业部节能中心常熟喷嘴厂 | Heat stored burner |
| CN101280916A (en) * | 2008-05-14 | 2008-10-08 | 天津市赛洋工业炉有限公司 | Thermal storage type oxygen-enriched combusting method and device |
| CN102278758A (en) * | 2011-06-17 | 2011-12-14 | 中冶京诚工程技术有限公司 | Heating device of radiant tube |
| CN102252328A (en) * | 2011-07-06 | 2011-11-23 | 重庆赛迪工业炉有限公司 | Radiation tube heater |
| CN205780972U (en) * | 2016-06-30 | 2016-12-07 | 李志勇 | Open crossover valve and include the conversion equipment of this switching valve |
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| Publication number | Publication date |
|---|---|
| CN111197743A (en) | 2020-05-26 |
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