CN216011809U - Gas-electricity hybrid combustor and industrial kiln - Google Patents

Abstract

The utility model provides a gas-electricity hybrid combustor and industrial kiln. The gas-electric hybrid burner (100) is used for an industrial kiln, the gas-electric hybrid burner (100) comprises a gas gun (1) for delivering gas and an electric heater (2), wherein the electric heater (2) is configured to provide heat to adjust the furnace temperature of the industrial kiln.

Description

Gas-electricity hybrid combustor and industrial kiln

Technical Field

The utility model relates to a combustor field particularly, relates to a gas-electricity hybrid combustor, industrial kiln and control method.

Background

NOx emissions from combustion systems are one of the major areas of environmental protection concerns. Combustors are a critical part of combustion systems and there is a constant effort to find ways to reduce their NOx emissions without compromising energy efficiency. In the oil refining and petrochemical industries, existing burner NOx abatement technologies, such as fuel/air staged combustion and external flue gas recirculation, have matured, in other words, they almost reach the bottleneck of further NOx abatement.

Carbon monoxide (CO) is another regulated pollutant, and higher CO emissions also mean lower energy efficiency. As the temperature of the combustion system increases, the NOx content increases while the CO decreases, and vice versa. The key issue is how to balance the high CO emissions during low temperatures in the start-up phase and the high NOx emissions during high temperatures in the normal operation phase.

In addition to NOx and CO control, carbon emissions are another key point for combustion systems to consider. China has announced plans to reach the peak carbon emission by 2030 and strived to achieve carbon neutralization by 2060. How to further reduce carbon emissions from the combustion system without affecting the normal operation of the furnace is another key issue.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an aim at realize lower NOx and discharge and NOx CO balanced higher operational flexibility, reduce carbon and discharge simultaneously.

Furthermore, the present invention also aims to solve or alleviate other technical problems existing in the prior art.

The utility model discloses a solve above-mentioned problem with a gas-electric hybrid combustor, industrial kiln and control method, particularly, according to the utility model discloses an aspect provides:

a gas-electric hybrid burner, wherein it is used in an industrial kiln, comprising a gas gun for delivering gas and an electric heater, wherein the electric heater is configured to provide heat to regulate the temperature of the industrial kiln.

Optionally, according to an embodiment of the present invention, the electric heater includes an electric heating wire, an electric heating plate, an electric heating ceramic, a resistance wire heating rod, a resistance coil, a glass resistance film heating tube and/or an electromagnetic heater.

Optionally, according to an embodiment of the present invention, the gas-electric hybrid burner further includes an air box, an air door, and a fire-resistant member, the air door being in communication with the air box and being for introducing air and adjusting an amount of air, the fire-resistant member being disposed downstream of the air box along an air flow direction.

Optionally, according to an embodiment of the present invention, the gas-electric hybrid burner further includes a support disposed on the top plate of the wind box and supporting the fire-resistant member, a plurality of gas holes for generating and guiding flames are opened in the fire-resistant member, and the electric heater is disposed at the fire-resistant member.

Alternatively, according to an embodiment of the present invention, the electric heater is configured within the air box and the refractory member for heating air introduced through the damper and flowing through the electric heater.

Optionally, in accordance with an embodiment of the present invention, the electric heater is embedded in the refractory member.

Optionally, according to an embodiment of the invention, the electric heater further comprises a refractory support configured downstream of the refractory member in the air flow direction, whereby the electric heater is adapted to provide heat and can be used to assist the combustion of the gas provided by the gas gun on the surface of the electric heater.

Optionally, according to an embodiment of the present invention, the electric heater is configured at the inner wall of the damper, at the bellows and/or at the air inlet of the damper.

According to another aspect of the utility model, the utility model provides an industrial kiln, wherein, it has any kind of gas electricity co-combustion ware of above-mentioned, wherein, gas electricity co-combustion ware arrange in the industrial kiln.

According to a further aspect of the present invention, there is provided a control method for any one of the gas-electric hybrid burners described above, wherein the furnace temperature of the industrial kiln is adjusted by using the gas gun and/or the electric heater.

Alternatively, according to an embodiment of the present invention, the electric heater is used during a start-up phase of the gas-electric hybrid burner, and the gas gun is reused during an operating phase after the start-up phase, in which operating phase the heating power of the electric heater can be set different from that during the start-up phase, or the electric heater is switched off.

Alternatively, according to an embodiment of the present invention, the gas gun is used in a start-up phase of the gas-electric hybrid burner, and the electric heater is reused in an operating phase after the start-up phase.

The gas-electric hybrid burner, the industrial kiln and the control method have the advantages that: the utility model provides a gas-electricity hybrid combustor's technical conception, including the overall structure and the combustor operating method of combustor, add electric power in the combustor design to realize lower NOx and discharge and the balanced higher operational flexibility of NOx CO, reduce carbon and discharge simultaneously. In addition to better operating performance, cost can be reduced by optimizing the overall structure and refractory materials. This new technology may also help customers achieve carbon emissions reduction goals.

Drawings

The above and other features of the present invention will become apparent with reference to the accompanying drawings, in which,

fig. 1 shows a schematic view of the structure and layout of a gas-electric hybrid burner and its electric heater according to the present invention;

fig. 2 shows a schematic view of the structure and layout of another gas-electric hybrid burner and its electric heater according to the present invention;

fig. 3 shows a schematic view of the structure and layout of a further gas-electric hybrid burner and its electric heater according to the present invention; and

fig. 4 shows a schematic view of the structure and layout of a gas-electric hybrid burner and its refractory components and electric heater according to the present invention.

Detailed Description

It is easily understood that, according to the technical solution of the present invention, a plurality of alternative structural modes and implementation modes can be proposed by those skilled in the art without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical solutions of the present invention, and should not be considered as limiting or restricting the technical solutions of the present invention in their entirety or in any other way.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms. Furthermore, the terms "first," "second," "third," and the like are used for descriptive and descriptive purposes only and not for purposes of indication or implication as to the relative importance of the respective components.

Referring to fig. 1, there is shown a schematic structural and layout view of a gas-electric hybrid burner and an electric heater thereof according to the present invention.

The gas-electric hybrid burner 100 is used for an industrial kiln, and the gas-electric hybrid burner 100 comprises a gas gun 1 for delivering gas and an electric heater 2, wherein the electric heater 2 is configured to provide heat to adjust the temperature of the industrial kiln.

It should be understood that the gas-electric hybrid burner 100 may be a heating apparatus for oil refining, petrochemical or chemical production, in which the burner is used to mix and burn air and fuel in a manner that converts the air and fuel into heat energy by a chemical means of combustion. According to the above solution, it is known that, in addition to the conventional gas guns 1, the present burner also employs electric heaters 2, said electric heaters 2 being defined for adjusting the furnace temperature of said industrial kiln, i.e. they may replace or partially assume the furnace temperature adjustment purposes originally assumed by the gas guns. Advantages of using this solution include reduced carbon and NOx emissions, and easier and more accurate control of electricity, and therefore more flexible management of NOx/CO balance. Furthermore, CO emissions can be reduced, in particular in the case of low furnace temperatures.

The gas-electric hybrid burner 100 includes, in addition to the gas gun 1 and the electric heater 2, a windbox 3, a damper 4, and a refractory member 5, the damper 4 communicating with the windbox 3 and serving to introduce air and adjust the air volume, the refractory member 5 being disposed downstream of the windbox 3 in the air flow direction. The windbox provides an air flow path for the burner so that air can be mixed with fuel and combusted. The refractory member 5 is composed of a refractory material, wherein the refractory member 5 of fig. 1 to 3 is in the form of a refractory brick, and the refractory member 5 of fig. 4 is in the form of a flat rectangular parallelepiped. The refractory component 5 mainly has a refractory function, can bear various physical and chemical changes and mechanical actions at high temperature, and can play a certain flame restraining and supporting role. Besides, the burner can also comprise an incandescent lamp 7 which can stably burn for a long time, on one hand, the burner is used for delivering gas to burn, on the other hand, the burner can also ignite a gas gun to assist the gas gun to stably burn, and therefore, the safety factor is higher.

As can also be seen from fig. 1 to 3, the refractory component 5 is configured as a hollow solid of revolution and is arranged on the ceiling of the wind box 3. Thus, the refractory member 5 may be referred to internally as an inner chamber and the refractory member 5 may be referred to externally as an outer chamber, and the gas gun 1 may be configured correspondingly in the inner chamber and/or the outer chamber, in such a way that the burner is configured as a staged burner, the pilot burner 7 being exemplarily arranged in the inner chamber. Of course a single stage burner is also suitable. Since the focus of the present invention is on the design of the electric heater, other components of the burner are not described much. In addition, the features of the shape, number, arrangement, etc. of the electric heaters described below may be combined or mixed, and are not limited to the embodiments shown in the drawings.

As can also be seen from fig. 1, the electric heater 2 is constructed inside the windbox 3 and the refractory member 5 for heating the air introduced through the damper 4 and flowing through the electric heater 2. As a result, the air coming from the damper 4 (or its air inlet) flows through the wind box 3, which has been preheated by the electric heater 2 before it is mixed with the gas from the gas gun 1, and has a higher air temperature than conventional burners, so that relatively little gas is required in connection with the gas gun. In addition, the heated air also plays a role in auxiliary regulation of the furnace temperature to a certain extent.

The arrangement, number and shape of the electric heaters can be flexibly handled according to practical situations and requirements (such as the situation of the accommodation space available for the burner) without departing from the scope of the present invention, and are not limited to the specific examples in the figures. The electric heater 2 may comprise, for example, electric heating wires, electric heating plates, electric heating ceramics, resistance wire heating rods, resistance coils, glass resistance film heating tubes and/or electromagnetic heaters, wherein fig. 1 is in the form of groups of electric heating wires which extend in the longitudinal direction of the burner at even intervals and which are supported at their lower ends in the windbox 3 with struts 8. At the support 8, lines can also be formed to enable the electrical supply of the electric heater 2. Other embodiments of the electric heater are possible, for example they may be arranged on the inner wall of the damper 4, at the windbox 3 (including the inner wall of the windbox 3) and/or at the inlet of the damper 4, which may serve to heat the incoming air. In addition, the advantages of the electrically heated ceramic include high efficiency, uniform heat distribution, good thermal conductivity, strong mechanical properties, corrosion resistance, and magnetic field resistance.

Referring to fig. 2, there is shown a schematic view of the structure and layout of another gas-electric hybrid burner and its electric heater according to the present invention. Wherein the electric heater 2 is configured as an electric heating plate, in particular as an electric heating net. In addition, the electric heater 2 further includes a refractory support 21, and the refractory support 21 is configured downstream of the refractory member 5 in the air flow direction, so that the electric heater 2 is used to provide heat and can be used to assist combustion of the gas supplied from the gas gun 1 on the surface of the electric heater 2. Specifically, the heating body of the electric heater is surrounded by the main body of the refractory support 21, and the main body is connected to the upper end face of the refractory member 5 through a support cylinder 211. With this arrangement, since the electric heater is exposed to the furnace environment directly in the outer chamber, heat can be supplied more directly to effect regulation of the furnace temperature. And the gas from the gas guns in the outer cavity and the inner cavity can be mixed with the air heated by the electric heater 2 and combusted, so that the electric heater also plays a role of auxiliary combustion. At the same time, the refractory support 21 can also serve as a flame stabilizer. This effect is achieved by the shape of the refractory support 21, which can be configured, for example, in the form of a ring.

Referring to fig. 3, there is shown a schematic structural and layout view of still another gas-electric hybrid burner and its electric heater according to the present invention. Wherein the electric heater 2 is embedded in the refractory member 5. This embodiment has similar advantages with respect to the previously described embodiments and at the same time saves space in the arrangement within the burner. Specific embedding methods may be to form through holes in the refractory member 5 and then pass the electric heater 2 through the through holes in the form of heating wires, or to embed the electric heater 2 in the refractory member 5 in the form of heating sheets or the like.

Referring to fig. 4, there is shown a schematic view of the structure and layout of a gas-electric hybrid burner and its refractory components and electric heater according to the present invention.

The gas-electric hybrid burner 100 further includes a bracket 6, the bracket 6 being disposed on the top plate of the wind box 3 and supporting the refractory member 5, a plurality of gas holes 9 for generating and guiding flames being opened in the refractory member 5, and the electric heater 2 being disposed at the refractory member 5.

In the present solution, the fire resistant member 5 is configured in the form of a flat rectangular parallelepiped, and the electric heater 2 is arranged there, and may be specifically embedded in the fire resistant member 5 in the aforementioned manner, or wound around the fire resistant member 5 in the form of an electric heating wire. A line for energizing the electric heater 2 may also be arranged at the bracket 6. It is noted that the refractory member 5 is no longer constructed on the ceiling of the windbox 3 as in the previous embodiments, but is spaced downstream thereof. That is, the gas from the gas gun 1 is mixed with air and burned on the plane where the refractory member 5 is located, and this kind of burner is also called a surface burner. To support this mixing and combustion, a plurality of air holes 9 are configured in the refractory member 5, the air holes 9 being illustratively vertical holes evenly spaced apart from each other, the cross-sectional shape being, for example, circular, square, trapezoidal, ramp-shaped, or the like. The number, spacing from each other and the shape and size thereof can be designed according to the actual requirements for the flame morphology. Thus, the flame generated by the mixed combustion is equally divided into smaller flames by the respective air holes 9, but the total amount is not changed, thereby reducing the center flame temperature and the NO emission. Meanwhile, similar to the prior art, the electric heater is directly exposed to the furnace environment, so that heat can be supplied more directly to adjust the furnace temperature.

According to another aspect of the present invention, the present invention relates to an industrial kiln, wherein it has any one of the gas-electric hybrid burners 100 described above, wherein the gas-electric hybrid burner 100 is arranged in the industrial kiln. For the explanation of the specific schemes and features of the industrial kiln, please refer to the above contents of the gas-electric hybrid burner, which will not be described herein. The industrial kiln can be an industrial kiln heating kiln, a boiler, an incinerator and the like.

The operation of the burner, i.e. a control method for any of the gas-electric hybrid burners 100 described above, in which the furnace temperature of the industrial kiln is adjusted by using the gas gun 1 and/or the electric heater 2, is described below. That is, the electric heater 2 not only assists the gas gun 1 in adjusting the furnace temperature, but also replaces it when necessary. The NOx/CO balance is controlled by controlling the timing of use of the gas gun 1 and the electric heater 2.

One example is to reduce the power of the gas gun 1 by using the electric heater 2 more in the case of low furnace temperature; the power of the electric heater 2 is reduced in the case of a high furnace temperature, and the gas gun 1 is used more. For example, in particular, the electric heater 2 is used to provide heat during a start-up phase of the gas-electric hybrid burner 100, and the gas gun 1 is reused during an operating phase following the start-up phase, in which the heating power of the electric heater 2 may be set different from that during the start-up phase, or the electric heater 2 is turned off. The electric heater 2 is used at low furnace temperature or during start-up phase so that CO emissions are reduced compared to conventional burners, and the gas gun 1 is reused at high furnace temperature or during operation phase while the power of the electric heater 2 is adjusted (or even the electric heater 2 is switched off) to balance CO and NOx emissions.

Another example is to use the gas gun 1 during a start-up phase of the gas-electric hybrid burner 100 and to reuse the electric heater 2 during an operating phase following the start-up phase.

Furthermore, it should be noted that, for example, in the case of the surface burner shown in fig. 4, during the start-up phase, the electric heater 2 should raise the refractory component 5 to a temperature at which the gas can be ignited, so that when the gas gun 1 is started up later, the gas can be mixed with air and then the combustion process can be carried out.

It should be understood that all of the above preferred embodiments are exemplary and not restrictive, and that various modifications and changes in the specific embodiments described above, which may occur to those skilled in the art upon reading the teachings of the present invention, are intended to be within the scope of the appended claims.

Claims (9)

1. A gas-electric hybrid burner (100) for industrial kilns, the gas-electric hybrid burner (100) comprising a gas gun (1) for delivering gas and an electric heater (2), wherein the electric heater (2) is configured to provide heat to regulate the furnace temperature of the industrial kiln.

2. The gas-electric hybrid burner (100) according to claim 1, characterized in that the electric heater (2) comprises an electric heating wire, an electric heating plate, an electric heating ceramic, a resistance wire heating rod, a resistance coil, a glass resistance film heating tube and/or an electromagnetic heater.

3. A gas-electric hybrid burner (100) according to claim 1 or 2, characterized in that it further comprises a wind box (3), a damper (4) and a fire-resistant member (5), said damper (4) communicating with said wind box (3) and being used for introducing air and regulating the air volume, said fire-resistant member (5) being arranged downstream of said wind box (3) in the air flow direction.

4. Gas-electric hybrid burner (100) according to claim 3, characterized in that it further comprises a bracket (6), said bracket (6) being arranged on the top plate of said windbox (3) and supporting said refractory member (5), said refractory member (5) having a plurality of gas holes (9) made therein for generating and guiding flames, said electric heater (2) being arranged at said refractory member (5).

5. A gas-electric hybrid burner (100) according to claim 3, characterized in that said electric heater (2) is configured inside said windbox (3) and said refractory member (5) for heating the air introduced through said damper (4) and flowing through said electric heater (2).

6. Gas-electric hybrid burner (100) according to claim 3 or 4, characterized in that said electric heater (2) is embedded in said refractory member (5).

7. Gas-electric hybrid burner (100) according to claim 3, characterized in that said electric heater (2) further comprises a refractory support (21), said refractory support (21) being configured downstream of said refractory member (5) along the air flow direction, so that said electric heater (2) is used to provide heat and can be used to assist the combustion of the gas provided by said gas gun (1) on the surface of said electric heater (2).

8. Gas-electric hybrid burner (100) according to claim 3, characterized in that the electric heater (2) is configured at the inner wall of the damper (4), at the wind box (3) and/or at the inlet of the damper (4).

9. An industrial kiln, characterized in that it has a gas-electric hybrid burner (100) according to any one of claims 1 to 8, wherein the gas-electric hybrid burner (100) is arranged inside the industrial kiln.

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