JP7572549B2 - Gasification furnace with double helix burners arranged - Google Patents

Description

The present invention relates to the field of coal gasification technology, and more specifically to a gasification furnace with an arrangement of double helix burners.

Coal gasification technology is the core technology for clean and efficient use of coal, and is an important technology for developing advanced clean coal power generation, coal chemical industry, coal-based polygeneration and other energy systems, and has an important impact on the reliability and economics of each system's operation. Driven by the rapid development of modern coal gas chemical industry projects, coal gasification technology is developing in the direction of large scale, clean and efficient, and adaptable to a wide range of coal types. The development of coal gasification technology is in full bloom, but at the current stage, in the development process of high-efficiency and clean coal gasification technology, there are still challenges such as improving gasification efficiency, enhancing the reliability of equipment operation, and reducing pollutant emissions.

The major technical challenge facing mainstream coal gasification technology is to break through the key technology of high-efficiency nozzles for dry pulverized coal entrained bed gasification, which is the key to improving the coal gasification efficiency and system reliability of mainstream coal gasification technology, expanding the scope of application of gasified coal types, reducing pollutant emissions during the gasification process, and strengthening the engineering and technical service capabilities in the field of clean and efficient coal utilization.

Currently, most gasifier burners are mainly arranged in an opposed jet manner, forming a flow field in which impinging flow and jet flow mix in gasifiers such as space furnaces and GPS. The combined burner opposed jet manner of the gasifier significantly increases the central temperature of the gasifier and significantly increases the amount of fly ash generated. Small gasifiers such as shell furnaces set a deflection angle on the burner to lower the central temperature of the gasifier and reduce the amount of fly ash generated, but this method only deflects the burner in the same plane to form a tangent circle on one plane, and there is a limit to improving the slag capture efficiency.

In order to solve the above problems, the present invention aims to provide a gasification furnace equipped with an arrangement of double helix burners that lowers the central temperature of the gasification furnace while diffusing ash particles in the radial direction, significantly reducing the amount of fly ash and improving the amount of slag generated.

The present invention is realized by the following technical solutions:
The present invention discloses a gasification furnace in which double spiral burners are arranged, which includes a gasification furnace body and several first burners and several second burners arranged on the inner wall of the gasification furnace body along a spiral line of the same rotation direction, wherein the burner ports of the first burners and the second burners are both directed toward the center of the gasification furnace body , and in a horizontal plane of the same layer in the gasification furnace body , each first burner is distributed centrally symmetrically with one second burner relative to the center point of the gasification furnace body , and the first burners and the second burners are both deflected obliquely upward toward the inner wall of the gasification furnace body at the same angle, and the deflection direction of the first burners and the second burners is the same as the rotation direction of the respective arranged spiral lines.

Preferably, the spiral lines along which the first burner and the second burner are arranged are both equal-pitch spiral lines.

Preferably, the height differences between adjacent first burners are equal.

More preferably, the height difference between adjacent first burners is 0<, and the total height of the spiral line in which the first burners and the second burners are arranged is ≦1/10 of the total height of the gasification furnace body.

Preferably, the number of layers in which the first burners are arranged is 1 to 4.

Preferably, the first burner and the second burner have the same deflection direction in the horizontal plane and the same deflection direction in the vertical plane.

More preferably, the horizontal deflection angle of the first burner is between 1° and 5°.

More preferably, the deflection angle of the first burner in the vertical direction is between 0.5° and 5°.

Preferably, the number of first burners is 1 to 4.

Preferably, the distance between the first and second burners at the lowest end and the slag port of the gasifier is 1/6 to 1/5 of the total height of the gasifier body.

Compared with the prior art, the present invention has the following beneficial technical effects:
In the gasification furnace with double spiral burners arranged as disclosed by the present invention, the multidimensional arrangement in which the first burner and the second burner are respectively arranged along a spiral line on the inner wall of the gasification furnace forms a mutually promoting double cyclone that diffuses outward after the pulverized coal is gasified, and the high-temperature flame area diffuses radially inside the gasification furnace body , making the flame inside the gasification furnace body more enriched, and significantly reducing the flame temperature in the central region of the gasification furnace body and the radiant heat intensity of the burner head and burner cover. The cyclone diffuses ash particles radially, making them easier to capture by the wall surface, significantly reducing the amount of fly ash and improving the amount of slag generation. The double spiral multi-dimensionally arranged burners uniformly distribute the heat of the gasifier at the same height in the horizontal plane of the same layer in the gasifier body , since each first burner and second burner is centrosymmetrical with respect to the center point of the gasifier body , and the two burners deflected toward each other at the same height form a counter jet momentum to prevent the flame from being blown onto the wall surface of the gasifier, and a stable cyclone is formed on the same horizontal plane, improving the controllability and plasticity of the gasifier, uniformly distributes the temperature of the gasifier on the spiral line, a reaction field with a uniform temperature is formed at the height of the spiral line, and a stable slag film is formed in the reaction field with a uniform temperature, improving the operation stability of the gasifier.

Furthermore, the spiral line in which the first burner and the second burner are arranged is an equal-pitch spiral line, so that the airflow is uniformly subjected to force at each segment, ensuring the stability of the cyclone.

Furthermore, the elevation difference between adjacent first and second burners is equal, providing a continuous and uniform upward force to the cyclone, allowing the cyclone to rotate upward uniformly.

Furthermore, 0<height difference between adjacent first burners, and the total height of the spiral line in which the first burners and second burners are arranged≦1/10 of the total height of the gasification furnace body, and the height difference is selected in a reasonable numerical range so that the arrangement of the first burners and second burners is not overcrowded or sparse, thereby improving the cyclone effect that is formed.

Furthermore, the number of layers in which the first burners and second burners are arranged is 1 to 4, and if there are too many layers, the cost increases.

Furthermore, the first burner and the second burner have the same deflection direction in the horizontal plane and the same deflection direction in the vertical plane, so they have good coordination, the parameters of the cyclones formed are similar, and they have good mutual enhancement.

In addition, the burner has a horizontal deflection angle of 1° to 5°, which provides centrifugal force to the ash slag toward the wall surface; if the angle is too large, it is likely to burn the wall surface of the gasifier.

Furthermore, the vertical deflection angle of the burner is 0.5°-5°, which can provide an upward slanting force to the airflow; if the angle is too large, it can reduce the residence time of the pulverized coal in the gasifier, and the vertical upward deflection angle α=arctan(h/r), where h is the height difference of the burner and r is the inner diameter of the gasifier, can be promoted in conjunction with the cyclone of the next burner.

Furthermore, the number of first burners and second burners is 1 to 4 each; if the number is too small, the cyclone formed will be unstable, and if the number is too large, the cost will increase.

Furthermore, the distance between the first and second burners at the lowest end and the slag port of the gasifier is 1/6 to 1/5 of the total height of the gasifier, and this position can increase the residence time of the pulverized coal in the gasifier and increase the reaction time.

FIG. 1 is a schematic plan view of the overall configuration of the present invention. 3 is a schematic plan view showing the positional relationship between a first burner and a second burner on each horizontal plane in a gasification furnace body of the present invention. FIG. FIG. 1 is a schematic front view of the overall configuration of the present invention. FIG. 2 is a schematic diagram of a cyclone formed within the gasifier body of the present invention. FIG. 2 is a schematic diagram of the deflection angles of the first and second burners of the present invention.

The present invention will be described in more detail below in conjunction with the drawings, the contents of which are for illustrative purposes only and not for limiting the present invention.

As shown in Figures 1 and 3, the gasifier with the double spiral burners of the present invention includes a gasifier body 3 and several first burners 1 and several second burners 2 of the same specifications arranged on the inner wall of the gasifier body 3 along a spiral line in the same turning direction, the burner ports of the first burner 1 and the second burner 2 are both directed toward the center of the gasifier body , and preferably, the spiral line on which the first burner 1 and the second burner are arranged is an equal-pitch spiral line. Preferably, the height difference between adjacent first burners 1 is equal, and the height difference between adjacent second burners is equal, generally, 0<the height difference between adjacent first burners 1, and the total height of the spiral line on which the first burner 1 and the second burner 2 are arranged is ≦1/10 of the total height of the gasifier body 3. The second burners 2 are distributed in line with the first burners 1. Generally, the number of layers on which the first burners 1 are arranged is 1-4.

As shown in FIG. 2, on the same horizontal plane in the gasifier body , the first burners 1 are distributed centrosymmetrically with one second burner with respect to the center point of the gasifier body .

The first burner 1 and the second burner 2 are both deflected obliquely upward toward the inner wall of the gasifier body 3 at the same angle, and the deflection direction of the first burner 1 and the second burner 2 is the same as the rotation direction of the respective arrangement spiral lines. The first burner 1 and the second burner 2 have the same deflection direction in the horizontal plane and the same deflection direction in the vertical plane. Preferably, the deflection angle of the first burner 1 in the horizontal direction is 1°-5°, and the deflection angle of the first burner 1 in the vertical direction is 0.5°-5°. As shown in FIG. 5, in the design selection, β=arctan(h/r), where h is the height difference of the burners, r is the inner diameter of the gasifier, and the vertical upward deflection angle α=arctan(h/r), where h is the height difference of the burners, and r is the inner diameter of the gasifier, can be promoted just in conjunction with the cyclone of the next burner.

The number of first burners is 1 to 4, the number of second burners 2 is equal to the number of first burners 1, and the distance between the lowest first burner 1 and second burner 2 and the slag port of the gasification furnace is 1/6 to 1/5 of the total height of the gasification furnace body 3.

As shown in FIG. 4, the above-mentioned double-helix multi-dimensional arrangement of the first burner 1 and the second burner 2 forms a mutually promoting double cyclone that diffuses outward after the pulverized coal is gasified.

The present invention will be described in more detail below with reference to a specific example.

A 1,000 t/day dry pulverized coal gasifier has a diameter of 3 m and a height of 18 m. Currently, there are three supply first burners 1 and three supply second burners 2, with adjacent second burners 2 uniformly distributed across the cross section of the gasifier at an angle of π/3, the vertical height difference between adjacent second burners is 0.1 m (the inner diameter of the burner is 0.05 m), the horizontal deflection angle of the second burners 2 is 1.5°, and the vertical deflection angle is 2° (α=arctan (h/r)). After the first burner 1 and the second burner 2 are supplied, the synthesis gas forms a cyclone in the gasifier body .

The mutually promoting double cyclone formed by the first burner 1 and the second burner 2 arranged in a double spiral multi-dimensional manner in the gasifier body 3 diffuses the high flame temperature area in the radial direction inside the gasifier body , making the flame inside the gasifier body more substantial, while at the same time reducing the flame temperature in the central region of the gasifier body by 350°C and the average burner temperature by 170°C. This reduces the radiant heat intensity of the burner head and burner cover.

At the same time, the cyclone formed by the synthesis gas disperses ash particles radially, making them easier to capture by the walls, reducing the amount of fly ash by 60% and significantly increasing the amount of slag generated.

According to statistics, compared with conventional technical solutions, this technical solution has a cold gas efficiency of ≧82.5% and a carbon content in ash of ≦20%.

The above is merely a part of the embodiment of the present invention, and any equivalent changes made based on the system described in the present invention are included in the scope of protection of the present invention. A person skilled in the art to which the present invention belongs may replace the specific examples described in a similar manner, and any such replacement falls within the scope of protection of the present invention as long as it does not deviate from the configuration of the present invention or exceed the scope defined in the claims.

1 First burner 2 Second burner 3 Gasifier body

Claims (8)

A gasification furnace having a double helix burner arrangement,
The gasification furnace includes a gasification furnace body (3), and several first burners (1) and several second burners (2) arranged on an inner wall of the gasification furnace body (3) along different spiral lines, the spiral line on which the several first burners (1) are arranged and the spiral line on which the several second burners (2) are arranged have the same rotation direction, and the burner ports of the first burners (1) and the second burners (2) are both directed toward the central axis of the gasification furnace body (3). In the horizontal plane of the same layer in the gasifier body (3), each first burner (1) is distributed symmetrically with one second burner (2) with respect to the center point of the gasifier body (3), the first burner (1) and the second burner (2) are both deflected obliquely upward toward the inner wall of the gasifier body (3) at the same angle, the deflection direction of the first burner (1) and the second burner (2) is the same as the rotation direction of the respective arrangement spiral lines, and the height difference between adjacent first burners (1) is equal .
A gasification furnace having an arrangement of double helix burners. The spiral lines in which the first burner (1) and the second burner (2) are arranged are both equal-pitch spiral lines.
A gasification furnace having an arrangement of double helix burners according to claim 1. 0<height difference between adjacent first burners (1), and the total height of the first burners (1) and the second burners (2) arranged is ≦1/10 of the total height of the gasification furnace body (3);
A gasification furnace having an arrangement of double helix burners according to claim 1 . The first burner (1) and the second burner (2) have the same deflection direction in a horizontal plane and the same deflection direction in a vertical plane.
A gasification furnace having an arrangement of double helix burners according to claim 1. The horizontal deflection angle of the first burner (1) relative to the central axis of the gasification furnace body (3) is 1° to 5°;
A gasification furnace having an arrangement of double helix burners according to claim 4 . the deflection angle of the first burner (1) in the vertical direction relative to the horizontal plane on which the first burner (1) is located is between 0.5° and 5°;
A gasification furnace having an arrangement of double helix burners according to claim 4 . The number of first burners (1) is 3 or 4;
A gasification furnace having an arrangement of double helix burners according to claim 1. The distance between the first burner (1) and the second burner (2) at the lowest end and the slag port of the gasification furnace is 1/6 to 1/5 of the total height of the gasification furnace body (3).
A gasification furnace having an arrangement of double helix burners according to claim 1.