CN215327932U - Gas stove with high operation rate - Google Patents
Gas stove with high operation rate Download PDFInfo
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- CN215327932U CN215327932U CN202121529359.XU CN202121529359U CN215327932U CN 215327932 U CN215327932 U CN 215327932U CN 202121529359 U CN202121529359 U CN 202121529359U CN 215327932 U CN215327932 U CN 215327932U
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Abstract
The utility model discloses a gas furnace with high running rate, which comprises a circulating fluidized bed gasification furnace body and a gas-solid separator, wherein the gas output end of the circulating fluidized bed gasification furnace body is communicated with the gas-solid separator, the gas output end of the gas-solid separator is used as the gas output end, and the solid output end of the gas-solid separator is communicated with the circulating fluidized bed gasification furnace body so as to convey the separated ash slag to the hearth of the circulating fluidized bed gasification furnace for combustion and gasification. The gas-solid separator is arranged at the gas output end of the circulating fluidized bed gasification furnace body to perform gas-solid separation, and separated ash residues such as coal-fired particles are conveyed into the hearth of the circulating fluidized bed gasification furnace to perform secondary combustion gasification, so that the unburned ash residues are circularly combusted and gasified, the coal conversion rate is improved, the gas yield per ton of coal and the gasification strength of the circulating fluidized bed gasification furnace are greatly improved, and the carbon content of fly ash outputting crude gas can be reduced.
Description
Technical Field
The utility model relates to the technical field of combustion equipment, in particular to a gas furnace.
Background
In the fluidized bed gasification furnace, fuel (such as lignite) with high gasification reactivity is adopted, the granularity is about 0-10mm, and due to the small granularity and the strong heat transfer capability of the fluidized bed, the coal material is heated to the temperature in the furnace at the moment of feeding the coal material into the furnace, and the processes of evaporation of moisture, decomposition of volatile matters, cracking of tar, combustion and gasification of carbon are almost simultaneously carried out.
Because the particle size distribution of the fuel added into the fluidized bed gasification furnace is relatively dispersed, and the diameter of the fuel particles is continuously reduced along with the gasification reaction, the corresponding free settling velocity is correspondingly reduced; when its corresponding free settling velocity is reduced to less than the operating gas flow velocity, fuel particles are carried away, thereby reducing the combustion gasification rate and reducing the coal conversion rate.
The circulating fluidized bed pulverized coal gasification furnace of our company mainly produces gas as fuel for roasting alumina, which is 10000m3In the production and operation processes of the circulating fluidized bed pulverized coal gasification furnace, the problems of low conversion efficiency, high carbon content of ash and slag and the like exist at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems and provide a high-operation-rate gas furnace, which can circularly combust and gasify unburned ash, improve the coal conversion rate, greatly improve the gas yield per ton of coal and the gasification strength of a circulating fluidized bed gasification furnace, and reduce the fly ash carbon content of output raw gas.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
a gas furnace comprises a circulating fluidized bed gasification furnace body and a gas-solid separator, wherein a gas output end of the circulating fluidized bed gasification furnace body is communicated with the gas-solid separator, a gas output end of the gas-solid separator is used as a gas output end, and a solid output end of the gas-solid separator is communicated with the circulating fluidized bed gasification furnace body so as to convey ash and slag separated out from the gas-solid separator to a hearth of the circulating fluidized bed gasification furnace for combustion and gasification.
As mentioned above, the gas-solid separator is arranged at the gas output end of the circulating fluidized bed gasification furnace body for gas-solid separation, and ash residues such as separated coal-fired particles are conveyed into the hearth of the circulating fluidized bed gasification furnace for secondary combustion gasification, so that the ash residues which are not completely combusted are circularly combusted and gasified, the coal conversion rate is improved, the gas yield per ton of coal and the gasification strength of the circulating fluidized bed gasification furnace are greatly improved, and the carbon content of fly ash outputting crude gas can be reduced.
As an option, the gas furnace further comprises a tubular spiral coal feeder, wherein an output end of the spiral coal feeder is connected to one side wall of a hearth of the circulating fluidized bed gasification furnace to convey coal particles, and a coal particle inlet of the hearth is positioned at the right opposite side of an ash inlet of the hearth. Therefore, the ash and the coal particles on the coal supply side can be prevented from being closely adjacent to each other and mixed with each other, and the combustion efficiency is improved.
As an option, the axial length a of the coal feeding port of the coal hopper of the spiral coal feeder is 1.5-2 times the inner diameter c of the sleeve, wherein the radial width b of the coal feeding port of the coal hopper of the spiral coal feeder is the same as the inner diameter c of the sleeve. Therefore, the spiral coal feeding port of the coal hopper is far larger than the inner diameter of the sleeve, the contact area of the spiral flood dragon and the coal hopper is increased, the pressure of the coal feeding inlet at the head of the sleeve is improved, and the phenomenon of cross fire of the coal feeder is effectively reduced.
As an option, the head of the sleeve of the spiral coal feeder is provided with an inner sleeve part, and the inner sleeve part is arranged on the inner wall of the sleeve, so that the inner wall of the sleeve contracts inwards to approach a spiral flood dragon; wherein the distance between the spiral flood dragon and the inner wall of the inner sleeve part is 3-5 mm. Therefore, the inner sleeve is additionally arranged at the spiral head part, so that the gap between the spiral auger and the sleeve is reduced, the pressure of a coal feeding inlet at the sleeve head part is improved, the spiral sealing performance is improved, and the cross fire is avoided; moreover, the tail gap is larger, which is beneficial to stably conveying coal particles.
As an option, the inner sleeve part is cylindrical, a guide port is arranged on the inner side wall of the inner sleeve part, which is far away from the coal particle entrance end, and the wall surface of the guide port gradually shrinks along with the approach of the inner sleeve part to the coal particle entrance; wherein the wall surface at the guide opening is in a tilted surface structure on the axial section. Therefore, the acting force is dispersed to the radial direction, the smooth guiding can be realized, and the connection stability is improved.
As an option, the gas furnace further comprises a spiral slag cooler, wherein the input end of the spiral slag cooler is connected to the bottom of the circulating fluidized bed gasifier body so as to discharge the coal slag in the hearth of the circulating fluidized bed gasifier body; under the condition of coal gas production in operation, the spiral coal feeder continuously feeds coal at a certain coal feeding flow rate Q1, and the spiral slag cooler continuously discharges slag at a certain slag discharging flow rate Q2, so that a material layer in a furnace cavity of the circulating fluidized bed gasification furnace body can be kept at a certain thickness d. Therefore, a material layer with a certain thickness exists in the circulating fluidized bed, and the materials are continuously circulated and overturned up and down, so that the retention time of fuel particles in the circulating fluidized bed is greatly prolonged, the time enough to ensure the fuel to be burnt out is provided for any fuel which is difficult to burn out, the combustion gasification rate is improved, and the carbon content of coal slag is reduced.
As an option, the gas furnace further comprises a gas supply mechanism, the gas supply mechanism comprises a steam generator, a fan, a heating assembly and a ventilation pipe, the heating assembly is arranged on the ventilation pipe, and the steam generator and the fan connected with the outside are respectively communicated with the air chamber of the circulating fluidized bed gasification furnace body through the ventilation pipe in parallel flow, so that high-temperature steam and air mixed steam can be supplied to the air chamber. Therefore, high-temperature air gasification is adopted, and the combustion gasification temperature of the hearth is favorably ensured.
Due to the adoption of the technical scheme, the utility model has the following beneficial effects:
1. according to the high-operation-rate gas furnace, the gas-solid separator is arranged at the gas output end of the circulating fluidized bed gasification furnace body for gas-solid separation, and separated ash residues such as coal-fired particles are conveyed into the hearth of the circulating fluidized bed gasification furnace for secondary combustion gasification, so that the ash residues which are not completely combusted are circularly combusted and gasified, the coal conversion rate is improved, the gas yield per ton of coal and the gasification strength of the circulating fluidized bed gasification furnace are greatly improved, and the fly ash carbon content of output crude gas can be reduced.
2. The spiral coal feeding port of the coal hopper is far larger than the inner diameter of the sleeve, the contact area of the spiral flood dragon and the coal hopper is increased, the pressure of the coal feeding inlet at the head of the sleeve is improved, and the phenomenon of cross fire of the coal feeder is effectively reduced. The inner sleeve is additionally arranged at the spiral head part, so that the gap between the spiral auger and the sleeve is reduced, the pressure of a coal feeding inlet at the head part of the sleeve is improved, the spiral sealing performance is improved, and the cross fire is avoided; moreover, the tail gap is larger, which is beneficial to stably conveying coal particles.
Drawings
Fig. 1 is a schematic structural view of an example of the present invention.
FIG. 2 is a schematic cross-sectional view of the middle portion of the coal hopper of the screw feeder of FIG. 1.
FIG. 3 is a schematic view of the internal structure of the sleeve head of the screw feeder of FIG. 1.
In the attached drawing, 1, a circulating fluidized bed gasifier body, 2, a spiral coal feeder, 3, a spiral slag cooler, 4, a ventilation pipe, 5, a gas-solid separator, 6, a coal hopper, 7, an inner sleeve part, 11, a hood, 12, an air chamber, 21, a sleeve, 22 and a spiral dragon.
Detailed Description
Examples
Referring to fig. 1, the gas furnace with high operation rate of the present embodiment includes a circulating fluidized bed gasifier body 1 and a gas-solid separator 5, a gas output end of the circulating fluidized bed gasifier body 1 is communicated to the gas-solid separator 5, a gas output end of the gas-solid separator 5 serves as a gas output end, and a solid output end of the gas-solid separator 5 is communicated to the circulating fluidized bed gasifier body, so as to convey ash separated therefrom to a hearth of the circulating fluidized bed gasifier for combustion and gasification.
The circulating fluidized bed gasification furnace body 1 and the gas-solid separator 5 are both existing devices, can be communicated and fixed by adopting heat-resistant ventilation pipes, welding and other modes, and can be realized by adopting the existing technology.
As mentioned above, the gas-solid separator is arranged at the gas output end of the circulating fluidized bed gasification furnace body for gas-solid separation, and ash residues such as separated coal-fired particles are conveyed into the hearth of the circulating fluidized bed gasification furnace for secondary combustion gasification, so that the ash residues which are not completely combusted are circularly combusted and gasified, the coal conversion rate is improved, the gas yield per ton of coal and the gasification strength of the circulating fluidized bed gasification furnace are greatly improved, and the carbon content of fly ash outputting crude gas can be reduced. The raw gas produced by the gas furnace is conveyed to the next procedure, and when the gas furnace is operated to produce gas, the gas is required to be supplied, supplied and discharged, and the gas furnace production system example formed by the raw gas is explained below.
The coal feeding apparatus will be explained below.
Referring to fig. 1, as an option, based on the foregoing example, in an example, the gas furnace further includes a tubular coal screw feeder 2, an output end of the coal screw feeder 2 is connected to one side wall of a hearth of the circulating fluidized bed gasification furnace 1 to convey coal particles, wherein a coal particle inlet of the hearth is located at a right opposite side of an ash inlet thereof. Therefore, the ash and the coal particles on the coal supply side can be prevented from being closely adjacent to each other and mixed with each other, and the combustion efficiency is improved. The spiral coal feeder can adopt conventional equipment and can be connected and fixed in a welding mode; the following will give a screw feeder improvement.
Referring to fig. 2-3, as an option, in one example, the axial length a of the coal feeding port of the coal hopper 6 of the screw feeder 2 is 1.5-2 times the inner diameter c of the sleeve 21 thereof, such as the sleeve having an outer diameter of phi 273mm and an inner diameter c of phi 260mm, wherein the radial width b of the coal feeding port of the coal hopper of the screw feeder is the same as the inner diameter c of the sleeve thereof. Therefore, the spiral coal feeding port of the coal hopper is far larger than the inner diameter of the sleeve, the contact area of the spiral flood dragon and the coal hopper is increased, the pressure of the coal feeding inlet at the head of the sleeve is improved, and the phenomenon of cross fire of the coal feeder is effectively reduced.
As an option, referring to fig. 2-3, in one example, the head of the sleeve 21 of the screw feeder 2 is provided with an inner sleeve portion 7, and the inner sleeve portion 7 is arranged on the inner wall of the sleeve 21, so that the inner wall of the sleeve 21 is contracted inwards to approach the screw auger 22; wherein the distance between the spiral flood dragon 22 and the inner wall of the inner sleeve part 7 is 3-5mm, such as 3, 3.5, 4 or 4.5 mm. Therefore, the inner sleeve is additionally arranged at the spiral head part, so that the gap between the spiral auger and the sleeve is reduced, the pressure of a coal feeding inlet at the sleeve head part is improved, the spiral sealing performance is improved, and the cross fire is avoided; moreover, the tail gap is larger, which is beneficial to stably conveying coal particles.
Referring to fig. 2-3, in a preferred embodiment, the inner sleeve portion is cylindrical, and a guiding opening is formed in the inner side wall of the inner sleeve portion, which is far away from the coal particle entrance end, and the wall surface of the guiding opening gradually shrinks as approaching the coal particle entrance; wherein the wall surface at the guide opening is in a tilted surface structure on the axial section. Therefore, the acting force is dispersed to the radial direction, the smooth guiding can be realized, and the connection stability is improved.
The slag removal equipment will be described below.
Referring to fig. 1, as an option, based on the foregoing example, in an example, the gas furnace further includes a spiral slag cooler 3, an input end of the spiral slag cooler 3 is connected to a bottom of the circulating fluidized bed gasifier body 1 to discharge the coal slag in the hearth of the circulating fluidized bed gasifier body; under the condition of coal gas production in operation, the spiral coal feeder continuously feeds coal at a certain coal feeding flow rate Q1, and the spiral slag cooler continuously discharges slag at a certain slag discharging flow rate Q2, so that the material layer in the furnace cavity of the circulating fluidized bed gasification furnace body can be kept at a certain thickness d, typically, the height of the material layer is kept in the range of 1.8-2.3m, specifically 1.9, 2, 2.1 or 2.2m, and the error is 0.05m or 0.1m, wherein the height kept by the material layer is mainly adjusted according to the change of the coal quality.
Wherein, this cold sediment machine of spiral can adopt existing equipment such as screw conveyer, can adopt the welding mode to connect fixedly. Therefore, a material layer with a certain thickness exists in the circulating fluidized bed, and the materials are continuously circulated and overturned up and down, so that the retention time of fuel particles in the circulating fluidized bed is greatly prolonged, the time enough to ensure the fuel to be burnt out is provided for any fuel which is difficult to burn out, the combustion gasification rate is improved, and the carbon content of coal slag is reduced.
The air supply apparatus will be explained below.
As an option, the gas furnace further comprises a gas supply mechanism, the gas supply mechanism comprises a steam generator, a fan, a heating assembly and a ventilation pipe, the heating assembly is arranged on the ventilation pipe, and the steam generator and the fan connected with the outside are respectively communicated with the air chamber of the circulating fluidized bed gasification furnace body through the ventilation pipe in parallel flow, so that high-temperature steam and air mixed steam can be supplied to the air chamber. Wherein steam generator, fan, intensification subassembly are existing equipment, and the intensification subassembly is existing heat exchanger, heater etc. and the fan is the air-blower etc.. Therefore, high-temperature air gasification is adopted, and the combustion gasification temperature of the hearth is favorably ensured.
As described above, the gas furnace has the following advantages:
1. the application provides a fly ash and cinder circulating combustion technology, fly ash and coal cinder particles separated from a cyclone separator are returned to a fluidized bed for secondary combustion gasification, so that the ton coal yield and gasification strength of pulverized coal gasification are improved, the running efficiency of a pulverized coal furnace is improved, the coal utilization rate of a gas furnace is improved, the coal utilization rate is improved to more than 90%, the coal conversion rate is improved, and the fly ash carbon content of the pulverized coal furnace is reduced.
2. The coal feeder is improved, the inlet of the spiral coal feeder is enlarged, the spiral coal feeding port of the coal hopper is far larger than the inner diameter of the sleeve, the contact area of the spiral auger and the coal hopper is increased, the pressure of the coal feeding port is improved, and the phenomenon of fire crossing of the coal feeder is avoided.
3. To the big poor leakproofness problem of feeder spiral flood dragon and sleeve clearance, through increase the endotheca at the sleeve head, reduce spiral flood dragon and sleeve clearance, increase spiral leakproofness, improve the coal feeding and go into furnace mouth pressure, avoid the system to cross a fire.
4. The material bed differential pressure has great influence on the carbon content of the ash of the circulating fluidized bed. Therefore, on the premise of ensuring the fluidization of the materials in the pulverized coal furnace, a small-flow and continuous deslagging mode is adopted, the operation condition of the coal feeder is controlled and focused, and a certain material layer thickness d is found and controlled, so that a material layer with a certain thickness exists in the circulating fluidized bed, and the materials are continuously circulated and overturned up and down, so that the retention time of fuel particles in the fluidized bed is greatly prolonged, and the time enough to ensure the burnout of any fuel which is difficult to burn out is provided.
5. The coal gas furnace has the advantages of improving the running efficiency of the pulverized coal furnace, reducing the energy consumption cost, improving the coal gasification efficiency, reducing the carbon content of ash slag, having important significance for improving the gasification rate research of the fluidized bed gasification furnace, being capable of producing coal gas with various specifications, having wide application field, and having great significance for meeting the requirements of civil coal gas and industrial coal gas in China and developing clean coal utilization technology.
It is to be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, when used in reference to a particular orientation or positional relationship, are used merely to facilitate describing the utility model and to simplify the description.
The foregoing description is directed to the details of preferred and exemplary embodiments of the utility model, and not to the limitations defined thereby, which are intended to cover all modifications and equivalents of the utility model as may come within the spirit and scope of the utility model.
Claims (7)
1. A gas furnace, characterized in that: the circulating fluidized bed gasification furnace comprises a circulating fluidized bed gasification furnace body and a gas-solid separator, wherein the gas output end of the circulating fluidized bed gasification furnace body is communicated to the gas-solid separator, the gas output end of the gas-solid separator is used as a gas output end, and the solid output end of the gas-solid separator is communicated to the circulating fluidized bed gasification furnace body so as to convey ash and slag separated by the gas-solid separator to a hearth of the circulating fluidized bed gasification furnace for combustion and gasification.
2. A gas furnace according to claim 1, wherein: the coal feeding device further comprises a tubular spiral coal feeder, wherein the output end of the spiral coal feeder is connected to one side wall of a hearth of the circulating fluidized bed gasification furnace so as to convey coal particles, and a coal particle furnace inlet of the hearth is positioned on the right opposite side of an ash furnace inlet of the hearth.
3. A gas furnace according to claim 2, wherein: the axial length a of the coal feeding port of the coal hopper of the spiral coal feeder is 1.5-2 times of the inner diameter c of the sleeve, wherein the radial width b of the coal feeding port of the coal hopper of the spiral coal feeder is the same as the inner diameter c of the sleeve.
4. A gas furnace according to claim 2, wherein: the head of the sleeve of the spiral coal feeder is provided with an inner sleeve part, and the inner sleeve part is arranged on the inner wall of the sleeve, so that the inner wall of the sleeve is contracted inwards to approach a spiral auger; wherein the distance between the spiral flood dragon and the inner wall of the inner sleeve part is 3-5 mm.
5. The gas furnace of claim 4, wherein: the inner sleeve part is cylindrical, a guide opening is formed in the inner side wall of the inner sleeve part, which is far away from the coal particle entrance end, and the wall surface of the guide opening gradually shrinks along with approaching the coal particle entrance; wherein the wall surface at the guide opening is in a tilted surface structure on the axial section.
6. A gas furnace according to claim 2, wherein: the input end of the spiral slag cooler is connected to the bottom of the circulating fluidized bed gasifier body so as to discharge coal slag in a hearth of the circulating fluidized bed gasifier body; under the condition of coal gas production in operation, the spiral coal feeder continuously feeds coal at a certain coal feeding flow rate Q1, and the spiral slag cooler continuously discharges slag at a certain slag discharging flow rate Q2, so that a material layer in a furnace cavity of the circulating fluidized bed gasification furnace body can be kept at a certain thickness d.
7. A gas furnace according to claim 1, wherein: the circulating fluidized bed gasification furnace also comprises a gas supply mechanism, wherein the gas supply mechanism comprises a steam generator, a fan, a heating assembly and a ventilation pipe, the heating assembly is arranged on the ventilation pipe, and the steam generator and the fan connected with the outside are respectively communicated to the air chamber of the circulating fluidized bed gasification furnace body after parallel flow through the ventilation pipe, so that high-temperature steam and air mixed steam can be supplied to the air chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121529359.XU CN215327932U (en) | 2021-07-07 | 2021-07-07 | Gas stove with high operation rate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121529359.XU CN215327932U (en) | 2021-07-07 | 2021-07-07 | Gas stove with high operation rate |
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| CN215327932U true CN215327932U (en) | 2021-12-28 |
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| CN202121529359.XU Active CN215327932U (en) | 2021-07-07 | 2021-07-07 | Gas stove with high operation rate |
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- 2021-07-07 CN CN202121529359.XU patent/CN215327932U/en active Active
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