Quench device for improving mixing effect of quench gas and synthetic gas, and mixing method

Abstract

The present invention belongs to the technical field of gas mixing, and particularly relates to a quench device for improving the mixing effect of quench gas and synthetic gas, and a mixing method. The quench device comprises a plurality of quench gas ports mounted on a dry pulverized coal gasification furnace body and guide wheels mounted inside the quench gas ports. The cross section of the dry pulverized coal gasification furnace body is a first imaginary circle, the plurality of quench gas ports being arranged along the circumference of the first imaginary circle; the number of the quench gas ports is a positive even number; every two quench gas ports constitute a rotary opposite jet pair, wherein the two quench gas ports of the same rotary opposite jet pair are arranged on the circumference of the same first imaginary circle and are symmetrically arranged with the circle center of the first imaginary circle as the center. The guide wheels are used for guiding quench gas, at least one of the rotary opposite jet pairs being provided with a guide wheel. The present solution provides the guide wheels mounted inside the quench gas ports, so that the guide wheels can guide quench gas, thereby improving the mixing effect of quench gas and synthetic gas.

Description

Quenching device and mixing method for improving mixing effect of quenching gas and synthesis gas Technical Field

[0001] The present invention belongs to the technical field of gas mixing, and in particular relates to a quenching device and a mixing method for improving the mixing effect of quenching gas and synthesis gas. Background Art

[0002] Coal gasification technology is one of the leading technologies in modern coal chemical industry. Dry pulverized coal gasification has the characteristics of high gasification parameters, large gasification capacity, high performance indicators, good environmental performance, and wide adaptability to coal types. It has been applied to current coal chemical projects and integrated gasification combined cycle (IGCC) power generation projects.

[0003] Existing technologies in dry pulverized coal gasifiers suffer from leakage and uneven mixing in the impact flow field between the quench gas and the synthesis gas, leading to inadequate heat exchange between the synthesis gas and the quench gas. Furthermore, high-temperature coal ash and unreacted coal pulverized particles spend a short time in the furnace. They rotate and flow with the synthesis gas flow, causing coal ash and coal pulverized particles to adhere to relevant channels and cause blockage. This leads to ash accumulation in the gasifier and poor heat exchange in the waste heat boiler, affecting the safe and stable operation of the gasifier. It also causes carbon loss and reduces the carbon conversion rate of the gasifier. Shutdowns caused by ash accumulation are a major factor in abnormal gasifier shutdowns. For example, for a 2,000-ton dry pulverized coal gasifier, each shutdown results in direct economic losses exceeding 2 million yuan, a significant loss. Summary of the Invention

[0004] The purpose of the present invention is to provide a quenching device and a mixing method for improving the mixing effect of quenching gas and synthesis gas, so as to solve the problems of leakage and uneven mixing in the collision flow field of quenching gas and synthesis gas in dry coal powder gasification furnaces in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a quenching device for improving the mixing effect of quenching gas and synthesis gas, comprising a plurality of quenching gas ports for installation on a dry coal pulverized gasifier body, and a guide wheel for installation in the quenching gas ports;

[0007] The cross section of the dry pulverized coal gasification furnace body is a first imaginary circle, and the plurality of quenching air ports are arranged along the circumference of the first imaginary circle; the number of the quenching air ports is a positive even number, and every two quenching air ports form a rotating counter-hedge group; the two quenching air ports of the same rotating counter-hedge group are arranged on the circumference of the same first imaginary circle and are symmetrically arranged with the center of the first imaginary circle as the center;

[0008] The guide wheel is used to guide the quenching air; wherein, at least one rotating counter-attack group is equipped with the guide wheel.

[0009] Furthermore, the guide wheel includes a guide blade sleeve, guide blades and a blade shaft;

[0010] The guide blade sleeve is used to be installed in the quenching air port and connected to the quenching air port;

[0011] The guide blades and the blade shaft are arranged in the guide blade sleeve, and the guide blades are fixedly connected to the blade shaft and the guide blade sleeve.

[0012] Furthermore, the first end of the guide blade is connected to the blade shaft, and the second end of the guide blade is connected to the inner wall of the guide blade sleeve;

[0013] The guide vanes are twisted from the first end to the second end.

[0014] Furthermore, an inlet guide cone is provided at one end of the blade shaft located on the air inlet side of the guide wheel.

[0015] Furthermore, the quenching air port is arranged toward the center of the first imaginary circle; or, the extension line of the quenching air port is tangent to a second imaginary circle, the second imaginary circle is a concentric circle of the first imaginary circle, and the diameter of the second imaginary circle is smaller than the diameter of the first imaginary circle.

[0016] Furthermore, the dry pulverized coal gasification furnace body is provided with a cross section, and at least one rotating counter-attack group is provided on the circumference of a first imaginary circle corresponding to the cross section.

[0017] Furthermore, the dry pulverized coal gasification furnace body is sequentially provided with at least two cross sections from top to bottom; and at least one rotating counter-attack group is provided on the circumference of the first imaginary circle corresponding to each cross section.

[0018] Furthermore, when at least two of the rotating counter-attacking groups are provided on the circumference of the same first imaginary circle, the quenching air ports are evenly arranged along the circumference of the first imaginary circle.

[0019] Furthermore, the guide blades and blade shafts are both made of 8825 alloy material.

[0020] In a second aspect of the present invention, a method for mixing syngas and quench gas is provided, which is based on the above-mentioned quenching device for improving the mixing effect of quench gas and syngas, and includes the following steps:

[0021] The quenching air in the quenching air port rotates around the blade axis under the action of the guide blades and the flow rate of the quenching air increases. After being ejected from the quenching air port, the quenching air collides and mixes with the synthesis gas in the dry coal powder gasification furnace body.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The quenching device provided in this solution has a guide wheel installed in the quenching air inlet. The guide wheel can guide the quenching air and increase the flow rate of the quenching air, thereby improving the mixing effect of the quenching air and the synthesis gas.

[0024] In this solution, the guide wheel includes a guide blade sleeve, guide blades and a blade shaft; the guide blade sleeve is used to be installed in the quenching air port and is connected to the quenching air port; the guide blades and the blade shaft are arranged in the guide blade sleeve, the guide blades are fixedly connected to the blade shaft and the guide blade sleeve, and the guide blades are twisted from the first end to the second end. Under the action of the guide blades, the quenching air rotates with the blade shaft as the rotation axis, and the flow rate of the quenching air can be increased. After the quenching air is ejected from the quenching air port, it collides and mixes with the second-stage synthesis gas in the dry coal powder gasification furnace body, further improving the mixing effect.

[0025] In this solution, the quenching air port is set toward the center of the first imaginary circle; or, the extension line of the quenching air port is tangent to the second imaginary circle. After the quenching air is ejected, it can collide along the direction of rotation of the reverse synthesis gas, which can also improve the mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0027] FIG1 is a schematic structural diagram of a dry pulverized coal gasifier according to an embodiment of the present invention;

[0028] FIG2 is a schematic diagram of the arrangement of the quenching air ports in an embodiment of the present invention; wherein, taking the arrangement of a rotating counter-attack group as an example, two quenching air ports are relatively arranged on the same circumference;

[0029] FIG3 is a cross-sectional view of the structure of the guide wheel in an embodiment of the present invention;

[0030] FIG4 is a schematic structural diagram of a guide wheel according to an embodiment of the present invention;

[0031] FIG5 is a schematic diagram showing the orientation of the chilling air ports according to an embodiment of the present invention; wherein eight chilling air ports are arranged;

[0032] FIG6 is a schematic diagram showing the orientation of a first-stage pulverized coal burner according to an embodiment of the present invention;

[0033] Among them: 1. quenching air inlet; 2. guide wheel; 21. guide blade sleeve; 22. guide blade; 23. blade shaft; 3. dry coal powder gasification furnace body; 4. inlet guide cone; 5. first imaginary circle; 6. second imaginary circle; 7. first-stage reaction chamber; 8. second-stage reaction chamber; 9. first-stage pulverized coal burner; 10. slag discharge port; 11. second-stage pulverized coal burner; 12. synthesis gas outlet reversal chamber; 13. heat exchanger channel; 14. heat exchanger; 15. air inlet pipeline. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0035] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise indicated, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Example 1

[0039] An embodiment of the present invention provides a quenching device for improving the mixing effect of quenching gas and synthesis gas, which is used to guide the quenching gas and improve the mixing effect of the quenching gas and synthesis gas.

[0040] As shown in Figures 1 to 5, a quenching device for improving the mixing effect of quenching gas and synthesis gas includes a plurality of quenching air ports 1 for installation on a dry coal powder gasification furnace body 3, and a guide wheel 2 for installation in the quenching air ports 1; the cross-section of the dry coal powder gasification furnace body 3 is a first imaginary circle 5, and the plurality of quenching air ports 1 are arranged along the circumference of the first imaginary circle 5; the number of quenching air ports 1 is a positive even number, and every two quenching air ports 1 form a rotating counter-attack group; the two quenching air ports 1 of the same rotating counter-attack group are arranged on the circumference of the same first imaginary circle 5, and are symmetrically arranged with the center of the first imaginary circle 5 as the center; the guide wheel 2 is used to guide the quenching gas, so that the quenching gas rotates itself, and the quenching gas flow rate after guidance is increased; wherein, at least one rotating counter-attack group is installed with a guide wheel 2.

[0041] The quenching device provided in the above-mentioned embodiment is used to quench syngas during the dry pulverized coal gasification process. This device can direct the quenching gas into a rotating state, increasing the mixing intensity of the quenching gas and syngas, ensuring uniform mixing of the quenching gas and syngas, and enhancing the heat exchange between the quenching gas and syngas. Furthermore, the swirling flow generated by the quenching gas facilitates the adhesion of ash and pulverized coal particles to the slag wall, facilitating the capture of ash and unburned pulverized coal particles by the gasifier slag layer for gasification. This increases gasification efficiency while reducing the probability of blockage in related channels, facilitating the safe and stable operation of the gasifier and improving its efficiency, while reducing downstream channel blockage and minimizing the risk of gasifier shutdown.

[0042] It should be noted that the center of the first imaginary circle 5 is on the vertical central axis of the dry coal pulverized gasification furnace body 3 .

[0043] As shown in Figures 3 and 4, in an optional embodiment, the guide wheel 2 includes a guide blade sleeve 21, a guide blade 22 and a blade shaft 23; the guide blade sleeve 21 is used to connect with the quenching air port 1; the guide blade 22 and the blade shaft 23 are arranged in the guide blade sleeve 21, and the guide blade 22 is fixedly connected to the blade shaft 23 and the guide blade sleeve 21.

[0044] In an alternative embodiment, the first end of the guide blade 22 is connected to the blade shaft 23, and the second end of the guide blade 22 is connected to the inner wall of the guide blade sleeve 21. The guide blade 22 twists from the first end to the second end. The number of guide blades 22 can be four, five, six, or more, and the twist direction and angle of these guide blades 22 are all consistent.

[0045] As an example, the guide vanes 22 have a twisted shape similar to turbine blades, etc., for changing the flow direction of the quenching gas.

[0046] According to the above solution, since the guide blades 22 are twisted, the direction of the quenching air passing through the guide blades 22 is also changed, and the quenching air passing through the guide blades 22 rotates around the blade shafts 23 .

[0047] As an example, the guide blade 22 may be connected to the blade shaft 23 and the guide blade sleeve 21 by welding.

[0048] In an optional embodiment, an inlet guide cone 4 is provided at one end of the blade shaft 23 located on the air inlet side of the guide wheel 2. Specifically, the inlet guide cone 4 is in the shape of a cone, with the tip of the cone facing the direction of the air inlet, and the bottom of the cone is integrally connected to the blade shaft 23, and the blade shaft 23 and the inlet guide cone 4 are coaxial.

[0049] As an example, the guide blade 22 and the blade shaft 23 are both made of 8825 alloy material; the guide blade 22 can be twisted into an 8 mm thick alloy plate, or made by casting, 3D printing, CNC machining and other methods, which is not specifically limited in this solution.

[0050] In an alternative embodiment, the quenching air port 1 is disposed toward the center of the first imaginary circle 5; alternatively, an extension of the direction of the quenching air port 1 is tangent to a second imaginary circle 6, which is concentric with the first imaginary circle 5 and has a smaller diameter than the first imaginary circle 5. In this embodiment, the quenching air is ejected in the opposite direction of the syngas, increasing the quenching air filling rate within the furnace and further enhancing the mixing effect.

[0051] As shown in FIG5 , eight quenching air ports 1 are arranged in FIG5 , and the directions of the quenching air ports 1 in FIG5 are opposite to the rotation direction of the synthesis gas.

[0052] In an optional embodiment, the dry pulverized coal gasification furnace body 3 is provided with a cross section corresponding to a first imaginary circle 5 , and at least one rotating counter-attack group is provided on the circumference of the first imaginary circle 5 .

[0053] As shown in FIG2 , as an example, a rotating counter-attack group is provided on the first imaginary circle 5 , that is, two quenching air ports 1 are provided, and an air inlet pipe 15 is connected to the quenching air ports 1 for supplying quenching air.

[0054] In an optional embodiment, the pulverized coal gasifier body 3 is sequentially provided with at least two cross-sections from top to bottom; each cross-section is provided with at least one rotating counterweight group. Specifically, multiple layers of mutually parallel first imaginary circles 5 can be provided along the pulverized coal gasifier body 3 from top to bottom, and quenching air ports 1 can be provided on the circumference of each layer of first imaginary circles 5.

[0055] In an optional embodiment, when at least two rotating counter-acting groups are provided on the same cross-section, the quenching air ports 1 are evenly arranged along the circumference of the first imaginary circle 5. Specifically, the circumference of the first imaginary circle 5 is divided into equal parts according to the number of quenching air ports 1, and a quenching air port 1 is arranged at each dividing point.

[0056] As an example, when there are two rotating counter-rotating groups, there are a total of four chilling air ports 1. During arrangement, the circumference of the first imaginary circle 5 is divided into four equal parts, and a chilling air port 1 is provided at each dividing point. When there are three, four, or more rotating counter-rotating groups, the circumference of the first imaginary circle 5 is also divided into four equal parts according to the number of chilling air ports 1, and the chilling air ports 1 are arranged according to the dividing points.

[0057] As an example, when the guide wheel 2 is not installed, the quenching air inlet 1 is in the shape of a tubular opening, allowing the quenching air to be blown directly into the gasifier through the tubular opening.

[0058] Example 2

[0059] A dry pulverized coal gasifier comprises the quenching device of embodiment 1.

[0060] As shown in FIG1 , the dry pulverized coal gasifier involved in this solution may be a two-stage gasifier.

[0061] The dry pulverized coal gasification furnace includes: a first-stage reaction chamber 7 and a second-stage reaction chamber 8. The first-stage reaction chamber 7 is arranged below the second-stage reaction chamber 8, and the first-stage reaction chamber 7 and the second-stage reaction chamber 8 are connected; a first-stage pulverized coal burner 9 is provided at the lower part of the first-stage reaction chamber 7, and a slag discharge port 10 is provided at the lower part; a second-stage pulverized coal burner 11 is provided at the lower part of the second-stage reaction chamber 8, and a quenching device is provided in the middle.

[0062] Specifically, as shown in Figure 6, the first stage of pulverized coal burners 9 is arranged with a certain angle deflected, which is opposite to the deflection angle of the quenching air port 1. It should be noted that the term "opposite" in this embodiment includes opposite directions or angles; for example, the direction of the first stage of pulverized coal burners 9 can be at a certain angle to the direction of the quenching air port 1 when viewed from above.

[0063] To be more specific, a quenching air inlet 1 is arranged in an annular manner above the second-stage reaction chamber 8 of the two-stage gasifier, and the quenching air inlet 1 is inserted into the dry coal powder gasifier body 3 along the circumference of the two-stage gasifier; a synthesis gas outlet reversal chamber 12 is provided above the quenching device; the outlet of the synthesis gas outlet reversal chamber 12 is connected to a heat exchanger channel 13, and a heat exchanger 14 is provided in the heat exchanger channel 13, and the heat exchanger 14 is used to further cool the second-stage synthesis gas output from the synthesis gas outlet reversal chamber 12.

[0064] Specifically, the first-stage reaction chamber 7 and the second-stage reaction chamber 8 are both surrounded by water-cooled walls.

[0065] Example 3

[0066] A method for mixing quench gas and synthesis gas comprises the following steps:

[0067] Coal and oxygen react in the first reaction chamber 7 to produce first-stage synthesis gas. The first-stage synthesis gas enters the second-stage reaction chamber 8, where pulverized coal is further added to react with the first-stage synthesis gas to produce second-stage synthesis gas.

[0068] The cooled synthesis gas is blown into the quenching air port 1 as quenching air. The quenching air rotates around the inlet guide cone 4 as the axis under the action of the guide wheel 2 in the quenching air port 1. Specifically, the quenching air in the quenching air port 1 rotates around the blade shaft 23 (the blade shaft 23 is coaxial with the inlet guide cone 4) as the rotation axis under the action of the guide blade 22, and the flow rate of the quenching air increases. At the same time, since the extension line of the direction of the quenching air port 1 is tangent to the second imaginary circle 6, at this time, the direction of the quenching air rotating around the inlet guide cone 4 is opposite to the direction of the second-stage synthesis gas. After the quenching air is ejected from the quenching air port 1, the quenching air rotates by itself, and the direction of the quenching air is opposite to that of the second-stage synthesis gas. The quenching air collides and mixes with the second-stage synthesis gas in the dry coal powder gasification furnace body 3, so that the quenching air and the second-stage synthesis gas are fully mixed and heat exchange is carried out. At the same time, the rotating quenching gas flow will increase the reaction time of the ash particles and coal powder particles carried in the second-stage synthesis gas, so that they are fully gasified, and "throw" the ash particles and coal particles that have not reacted fully onto the water-cooled wall, so as to facilitate the capture of the slag layer of the water-cooled wall, reduce the ash content of the downstream synthesis gas, and reduce the risk of blockage of the downstream heat exchanger channel 13.

[0069] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0070] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. A quenching device for improving the mixing effect of quenching gas and synthesis gas, characterized in that: It comprises a plurality of quenching air ports (1) installed on a dry coal pulverized gasification furnace body (3), and a guide wheel (2) installed in the quenching air ports (1); The cross section of the dry pulverized coal gasification furnace body (3) is a first imaginary circle (5), and the plurality of quenching air ports (1) are arranged along the circumference of the first imaginary circle (5); the number of the quenching air ports (1) is a positive even number, and every two quenching air ports (1) form a rotating counter-hedge group; the two quenching air ports (1) of the same rotating counter-hedge group are arranged on the circumference of the same first imaginary circle (5), and are symmetrically arranged with the center of the first imaginary circle (5) as the center; The guide wheel (2) is used to guide the quenching air; wherein, at least one rotating counter-attack group is equipped with the guide wheel (2).

2. The quenching device for improving the mixing effect of quenching gas and synthesis gas according to claim 1, characterized in that: The guide wheel (2) comprises a guide blade sleeve (21), a guide blade (22) and a blade shaft (23); The guide blade sleeve (21) is used to be installed in the quenching air port (1) and connected to the quenching air port (1); The guide blade (22) and the blade shaft (23) are arranged inside the guide blade sleeve (21), and the guide blade (22) is fixedly connected to the blade shaft (23) and the guide blade sleeve (21).

3. The quenching device for improving the mixing effect of quenching gas and synthesis gas according to claim 2, characterized in that: The first end of the guide blade (22) is connected to the blade shaft (23), and the second end of the guide blade (22) is connected to the inner wall of the guide blade sleeve (21).

4. The quenching device for improving the mixing effect of quenching gas and synthesis gas according to claim 2, characterized in that: An inlet guide cone (4) is provided at one end of the blade shaft (23) located on the air inlet side of the guide wheel (2).

5. The quenching device for improving the mixing effect of quenching gas and synthesis gas according to claim 1, characterized in that: The quenching air port (1) is arranged toward the center of the first imaginary circle (5); or, an extension line of the quenching air port (1) is tangent to a second imaginary circle (6), the second imaginary circle (6) is a concentric circle of the first imaginary circle (5), and the diameter of the second imaginary circle (6) is smaller than the diameter of the first imaginary circle (5).

6. The quenching device for improving the mixing effect of quenching gas and synthesis gas according to claim 1, characterized in that: The dry coal powder gasification furnace body (3) is provided with a cross section, and at least one rotating counter-hedge group is provided on the circumference of a first imaginary circle (5) corresponding to the cross section.

7. The quenching device for improving the mixing effect of quenching gas and synthesis gas according to claim 1, characterized in that: The dry coal powder gasification furnace body (3) is provided with at least two cross sections in sequence from top to bottom; at least one rotating counterweight group is provided on the circumference of the first imaginary circle (5) corresponding to each cross section.

8. The quenching device for improving the mixing effect of quenching gas and synthesis gas according to claim 1, characterized in that: When at least two of the rotating counter-attacking groups are provided on the circumference of the same first imaginary circle (5), the quenching air ports (1) are evenly arranged along the circumference of the first imaginary circle (5).

9. The quenching device for improving the mixing effect of quenching gas and synthesis gas according to claim 2, characterized in that: The guide blade (22) and the blade shaft (23) are both made of 8825 alloy material.

10. A method for mixing synthesis gas and quenching gas, characterized in that: The quenching device for improving the mixing effect of quenching gas and synthesis gas according to any one of claims 2 to 9 is implemented, comprising the following steps: The quenching air in the quenching air port (1) rotates with the blade shaft (23) as the rotation axis under the action of the guide blade (22), and the flow rate of the quenching air increases. After the quenching air is ejected from the quenching air port (1), it collides with and mixes with the second-stage synthesis gas in the dry coal powder gasification furnace body (3).

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