A fully premixed gas water-cooled wall combustion device

Abstract

The present invention relates to the technical field of burners, and in particular to a fully premixed gas water-cooled wall combustion device, comprising: a premixer, wherein the premixer mixes air compressed by a high-pressure fan with fuel gas to form a high-pressure mixed gas to be burned, and the mixed gas enters a combustion unit from the mixer inlet; a combustion unit, wherein the combustion unit is provided with a safety fire extinguishing net and a water-cooled combustion head, wherein the safety fire extinguishing net is installed at the mixer inlet, and the water-cooled combustion head is arranged on one side of the safety fire extinguishing net, and after the mixed gas enters the combustion unit, it is ignited on the surface of the water-cooled combustion head and burns; a water-cooling unit, wherein the water-cooling unit is provided with a two-stage water-cooled wall unit, which is arranged between the safety fire extinguishing net and the water-cooled combustion head to cool the heat generated during the combustion process in the combustion zone. The fully premixed gas water-cooled wall combustion device using this scheme effectively solves the problems in the prior art that the burner is relatively expensive, cannot achieve fully premixed combustion, its nitrogen emissions cannot meet the requirements of the new standards, and the combustion is unstable.

Description

Technical Field

[0001] The invention relates to the technical field of burners, and in particular to a full premixed gas water-cooled wall combustion device. Background Art

[0002] In accordance with the national call, various provinces across the country have successively issued relevant boiler combustion emission requirements to replace coal-fired boilers. In 2017, new low-nitrogen emission standards were introduced, especially Beijing, which promulgated the "Beijing Boiler Air Pollution Emission Standards", and the nitrogen oxide emission limit was reduced from the original 150Mg / cubic meter to 30 mg / cubic meter.

[0003] The new standard mainly emphasizes the emission of nitrogen oxides, and the emission standards are divided into two stages. The first stage: from the date of implementation to March 31, 2017, the nitrogen oxide emission standard for newly built boilers must be lower than 80 mg / cubic meter, and the nitrogen oxide emission standard for existing boilers must be lower than 150 mg / cubic meter; the second stage: from April 1, 2017, the nitrogen oxide emission standard for newly built boilers must be lower than 30 mg / cubic meter, and the nitrogen oxide emission standard for existing boilers must be lower than 80 mg / cubic meter.

[0004] In existing boiler combustion, the burner is relatively expensive and cannot achieve full premixed combustion. Its nitrogen emissions cannot meet the requirements of the new standards and the combustion is unstable. In view of this, it is necessary to improve the burner in the existing technology to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the prior art that the burner is relatively expensive, cannot achieve full premixed combustion, its nitrogen emissions cannot meet the requirements of the new standards, and the combustion is unstable, and to provide a full premixed gas water-cooled wall combustion device.

[0006] The technical solution to achieve the purpose of the invention is as follows:

[0007] A full premixed gas water-cooled wall combustion device, comprising:

[0008] A premixer, which mixes the air compressed by the high-pressure blower with the fuel gas in proportion to form a high-pressure mixed gas to be burned, and enters the combustion unit through the mixed gas inlet;

[0009] A combustion unit, wherein the combustion unit comprises a safety fire extinguishing net and a water-cooled combustion head, wherein the safety fire extinguishing net is installed at the mixed gas inlet, and the water-cooled combustion head is arranged on one side of the safety fire extinguishing net, and the high-pressure mixed gas to be burned is ignited on the surface of the water-cooled combustion head after entering the combustion unit, and burns on the surface thereof;

[0010] A water cooling unit, wherein the water cooling unit is provided with a two-stage water cooling wall unit, wherein the two-stage water cooling wall unit is provided between the safety fire extinguishing net and the water-cooled combustion head, and is used to cool the heat generated during the combustion process of the combustion unit;

[0011] The premixer comprises a radial premixer and an axial premixer. The radial premixer is connected to an air inlet of a high-pressure mixed gas to be combusted. One end of the axial premixer is connected to the radial premixer, and the other end is connected to a mixed gas inlet.

[0012] Compared with the prior art, the fully premixed gas water-cooled wall burner head of this scheme sets up a water cooling zone before the high-pressure mixed gas enters the combustion zone. During combustion, it is quickly cooled down through two-stage water-cooled wall tubes to achieve low-temperature safe combustion and reduce the generation of nitrogen oxides. In addition, since the high-pressure mixed gas burns on the surface of the water-cooled burner head, the combustion flame it produces is uniform, is not affected by changes in the environment, temperature, and airflow size, and the combustion is stable.

[0013] Furthermore, the two-stage water-cooled wall unit includes two layers of cooling surfaces which are parallel to each other and have equal cross-sections, and each layer of cooling surface includes a number of parallel water-cooled wall tubes; the water-cooled wall tubes are vertically arranged and installed in the combustion unit and perpendicular to the premixer, and a cooling circulating water inlet is provided at the lower end of the water-cooled wall tube and a cooling circulating water outlet is provided at the upper end.

[0014] Among them, the water circulation realizes the circulation of hot and cold water outside the water-cooled wall combustion device. The cold water enters from the cooling circulation water inlet, passes through the water-cooled wall tube, takes away the heat and takes the water out from the cooling circulation water outlet.

[0015] Furthermore, the safety fire extinguishing net is parallel to the plurality of water-cooled wall units, and the fire extinguishing area formed by the safety fire extinguishing net is equal to the vertical cross-sectional area of ​​the cooling surface.

[0016] The area of ​​the safety fire-fighting net must be large enough to completely cover the water-cooled surface formed by several vertically arranged water-cooled wall tubes to prevent flashback during the combustion process.

[0017] Furthermore, the water-cooled combustion head is arranged on the surface of the water-cooled wall unit away from the safety fire-fighting net, and the high-pressure mixed gas to be burned reaches the water-cooled combustion head through the gap between adjacent water-cooled wall units.

[0018] The high-pressure mixed gas to be burned passes through the safety fire extinguishing net and the two-stage water-cooled wall tubes in turn, passes through the gap between the two adjacent water-cooled wall tubes, and enters the water-cooled combustion head for combustion, which not only effectively reduces the temperature but also ensures stable combustion.

[0019] Furthermore, the distance between two adjacent water-cooled wall tubes is 1-2 mm, and the two layers of water-cooled wall units are in contact with each other.

[0020] The distance between two adjacent water-cooled wall tubes is guaranteed to be 1-2mm to ensure smooth passage of the mixed gas and stable combustion. The two layers of water-cooled wall units are in contact with each other, that is, there is zero distance contact between the two layers of water-cooled wall units, which ensures rapid cooling of the combustion head.

[0021] Furthermore, the invention also includes a semi-enclosed shell structure, in which the water-cooled wall unit, the safety fire-fighting net and the water-cooled combustion head are all installed, and the two ends of the water-cooled wall unit and the safety fire-fighting net are respectively fixed on two side end plates parallel to the semi-enclosed shell structure.

[0022] Specifically, a mixed gas inlet is opened on one side of the semi-closed shell structure, a premixer is installed on the mixed gas inlet side of the semi-closed shell structure, a water-cooled wall unit, a safety fire extinguishing net and a water-cooled burner head are installed inside the semi-closed shell structure, and both ends of the water-cooled wall unit and the safety fire extinguishing net are fixed on two side end plates parallel to the semi-closed shell structure, and it is necessary to ensure that the premixer is perpendicular to the safety fire extinguishing net.

[0023] Furthermore, the water-cooled wall tube is a cylindrical pipe structure, and its material is made of two materials: stainless steel 316L and alloy.

[0024] The water-cooled wall tubes are cylindrical pipes made of stainless steel 316L and alloy. When cold water passes through, it can quickly take away the heat generated by the combustion of the combustion head, achieving a good cooling and heat dissipation effect.

[0025] Furthermore, the ratio between the air compressed by the high-pressure fan and the gas is 1:9.

[0026] Ensure that the ratio between the charged air and the combustion gas is 1:9, making the combustion more complete and effectively reducing noise.

[0027] Furthermore, the high-pressure blower adopts a double-impeller high-pressure blower, and the internal pressure range of the blower is 30-45 kPa.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) In a fully premixed gas water-cooled wall combustion device of the present invention, a water cooling zone is provided before the high-pressure mixed gas enters the combustion zone. During combustion, the high-pressure mixed gas is rapidly cooled by two-stage water-cooled wall tubes to achieve low-temperature safe combustion and reduce the generation of nitrogen oxides. In addition, since the high-pressure mixed gas burns on the surface of the water-cooled combustion head, the combustion flame generated is uniform and is not affected by changes in the environment, temperature, and airflow size, and the combustion is stable.

[0030] (2) In a fully premixed gas water-cooled wall combustion device of the present invention, the water-cooled wall tube is vertically installed in the combustion zone and perpendicular to the premixer, and a cooling circulating water inlet is provided at the lower end of the water-cooled wall tube and a cooling circulating water outlet is provided at the upper end. The heat generated by the water-cooled burner head after heat radiation is exchanged and cooled through the two-stage water-cooled wall tube. The water flow in the tube circulates according to the natural power of bottom-in and top-out, thereby realizing rapid heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of the full premixer water-cooled wall combustion device of the present invention;

[0032] Figure 2 It is a side view of the full premixer water-cooled wall combustion device of the present invention;

[0033] Among them, 1. mixer inlet; 2. cooling circulating water inlet; 3. cooling circulating water outlet; 4. water-cooled burner head; 5. safety fire extinguishing net; 6. water-cooled wall unit; 7. premixer. DETAILED DESCRIPTION

[0034] The invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0035] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the invention.

[0036] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0037] 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 an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0038] Embodiment 1:

[0039] Please refer to Figure 1 and Figure 2 As shown, a fully premixed gas water-cooled wall combustion device of the present embodiment comprises: a premixer 7, wherein the premixer 7 mixes the air compressed by the high-pressure fan with the fuel gas in proportion to form a high-pressure mixed gas to be burned, and the mixed gas enters the combustion unit from the mixed gas inlet 1; a combustion unit, wherein the combustion unit comprises a safety fire extinguishing net 5 and a water-cooled combustion head 4, wherein the safety fire extinguishing net 5 is installed at the mixed gas inlet 1, and the water-cooled combustion head 4 is arranged on one side of the safety fire extinguishing net 5, and the high-pressure mixed gas to be burned is ignited on the surface of the water-cooled combustion head 4 after entering the combustion unit, and burns on its surface; a water-cooling unit, wherein a two-stage water-cooled wall unit 6 is arranged at the water-cooling unit, and the two-stage water-cooled wall unit 6 is arranged between the safety fire extinguishing net 5 and the water-cooled combustion head 4, and is used to cool the heat generated during the combustion process of the combustion unit; the premixer 7 comprises a radial premixer and an axial premixer, wherein the radial premixer is connected to the air inlet of the high-pressure mixed gas to be burned, and one end of the axial premixer is connected to the radial premixer, and the other end is connected to the mixed gas inlet 1.

[0040] The fully premixed gas water-cooled wall burner head of the present scheme is provided with a water cooling unit before the high-pressure mixed gas enters the combustion zone. During combustion, the burner head 4 is quickly cooled down by the two-stage water-cooled wall tubes 6 to achieve low-temperature safe combustion and reduce the formation of nitrogen oxides. In addition, since the high-pressure mixed gas burns on the surface of the water-cooled burner head 4, the combustion flame generated is uniform and is not affected by changes in the environment, temperature, and airflow size. The combustion is stable, and the occurrence of backfire is prevented by providing a safety fire-fighting net 5.

[0041] As a further extension of the present solution, the two-stage water-cooled wall unit 6 includes two layers of cooling surfaces which are parallel to each other and have equal cross-sections, and each layer of cooling surface includes a number of parallel water-cooled wall tubes; the water-cooled wall tubes are vertically arranged and installed in the combustion unit and are perpendicular to the premixer 7, and a cooling circulating water inlet 2 is provided at the lower end of the water-cooled wall tube and a cooling circulating water outlet 3 is provided at the upper end.

[0042] Since the water-cooled wall tube 6 is vertically installed in the combustion zone and perpendicular to the premixer 7, and a cooling circulating water inlet is provided at the lower end of the water-cooled wall tube 6 and a cooling circulating water outlet is provided at the upper end, the heat generated by the water-cooled burner head 4 after heat radiation is exchanged and cooled through the two-stage water-cooled wall tube 6, 2 in and 3 out, and the water flow in the tube is circulated according to the natural power water pump with bottom inlet and top outlet, entering from the cooling circulating water inlet at the lower end and flowing out from the cooling circulating water outlet at the upper end, thereby realizing rapid heat exchange.

[0043] Example 2

[0044] Compared with Example 1, the full premixed gas water-cooled wall combustion device of this embodiment is further, as Figure 1 As shown, the safety fire extinguishing net 5 is parallel to the plurality of water-cooled wall units 6, and the fire extinguishing area formed by the safety fire extinguishing net 5 is equal to the vertical cross-sectional area of ​​the cooling surface.

[0045] The area of ​​the safety fire-fighting net 5 must be large enough to completely cover the water-cooled surface formed by a plurality of vertically arranged water-cooled wall units 6 to prevent flashback during the combustion process.

[0046] like Figure 2 As shown, the water-cooled combustion head 4 is arranged on the surface of the water-cooled wall unit 6 away from the side of the safety fire extinguishing net 5, and the high-pressure mixed gas to be burned reaches the water-cooled combustion head 4 through the gap between adjacent water-cooled wall units 6.

[0047] The high-pressure mixed gas to be burned passes through the safety fire extinguishing net 5 and the two-stage water-cooled wall unit 6 in turn, passes through the gap between two adjacent water-cooled wall units 6, and enters the water-cooled combustion head 4 for combustion, which not only plays an effective role in cooling but also ensures stable combustion.

[0048] The distance between two adjacent water-cooled wall tubes is 1-2 mm, and the two layers of water-cooled wall units 6 are in contact with each other; the water-cooled wall tube 6 is a cylindrical pipe structure, and its material is made of stainless steel 316L and alloy.

[0049] The distance between two adjacent water-cooled wall tubes is guaranteed to be 1-2mm, ensuring that the mixed gas passes smoothly and can burn stably. The two layers of water-cooled wall units 6 are in contact with each other, that is, the two layers of water-cooled wall units 6 are in zero-distance contact, ensuring rapid cooling of the combustion head. The water-cooled wall tube 6 adopts a cylindrical pipe and is made of stainless steel 316L and alloy. When cold water passes through, it can quickly take away the heat generated by the combustion of the combustion head 4, which has a good cooling and heat dissipation effect.

[0050] It also includes a semi-enclosed shell structure, in which the water-cooled wall unit 6, the safety fire-fighting net 5 and the water-cooled combustion head 4 are all installed, and the two ends of the water-cooled wall unit 6 and the safety fire-fighting net 5 are respectively fixed on the two side end plates parallel to the semi-enclosed shell structure.

[0051] Specifically, a mixed gas inlet 1 is opened on one side of the semi-closed shell structure, a premixer 7 is installed on one side of the mixed gas inlet 1 of the semi-closed shell structure, a water-cooled wall unit 6, a safety fire extinguishing net 5 and a water-cooled burner head 4 are installed inside the semi-closed shell structure, and both ends of the water-cooled wall unit 6 and the safety fire extinguishing net 5 are fixed on two side end plates parallel to the semi-closed shell structure, and it is necessary to ensure that the premixer 7 is perpendicular to the safety fire extinguishing net 5.

[0052] As a further improvement of the present solution, the ratio between the air compressed by the high-pressure fan and the fuel gas is 1:9, and the high-pressure fan adopts a double-impeller high-pressure fan, and the internal pressure range is 45 to 65 kPa.

[0053] Ensure that the ratio between the injected air and the combustion gas is 1:9, so that the combustion is more complete and the noise can be effectively reduced; and ensure that the internal pressure of the high-pressure fan is between 30 and 45 kPa, providing sufficient power for the mixed gas to be transferred to the combustion head.

[0054] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

[0055] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0056] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A fully premixed gas water-cooled wall combustion device, characterized in that: include: A premixer (7), the premixer (7) mixes the air compressed by the high-pressure fan with the fuel gas in a certain proportion to form a high-pressure mixed gas to be burned, and the mixed gas enters the combustion unit through the mixed gas inlet (1); A combustion unit, the combustion unit comprising a safety fire extinguishing net (5) and a water-cooled combustion head (4), the safety fire extinguishing net (5) being installed at the mixed gas inlet (1), the water-cooled combustion head (4) being arranged on one side of the safety fire extinguishing net (5), and the high-pressure mixed gas to be combusted being ignited on the surface of the water-cooled combustion head (4) after entering the combustion unit, and burning on the surface thereof; A water cooling unit, wherein a two-stage water cooling wall unit (6) is provided at the water cooling unit, and the two-stage water cooling wall unit (6) is arranged between the safety fire extinguishing net (5) and the water-cooled combustion head (4) and is used to cool the heat generated during the combustion process of the combustion unit; The two-stage water-cooled wall unit (6) comprises two layers of cooling surfaces which are parallel to each other and have equal cross-sections, and each layer of cooling surface comprises a plurality of water-cooled wall tubes which are arranged in parallel; the water-cooled wall tubes are arranged vertically in the combustion unit and are perpendicular to the premixer (7), and a cooling circulating water inlet (2) is arranged at the lower end of the water-cooled wall tube, and a cooling circulating water outlet (3) is arranged at the upper end; The safety fire extinguishing net (5) is parallel to the two-stage water-cooled wall unit (6), and the fire extinguishing area formed by the safety fire extinguishing net (5) is equal to the vertical cross-sectional area of ​​the cooling surface; The premixer (7) comprises a radial premixer and an axial premixer. The radial premixer is connected to the high-pressure mixed gas inlet to be combusted. One end of the axial premixer is connected to the radial premixer, and the other end is connected to the mixed gas inlet (1).

2. A full premixed gas water-cooled wall combustion device according to claim 1, characterized in that: The water-cooled combustion head (4) is arranged on the surface of the two-stage water-cooled wall unit (6) at a side away from the safety fire extinguishing net (5), and the high-pressure mixed gas to be combusted reaches the water-cooled combustion head (4) through the gap between the two adjacent stages of the water-cooled wall units (6).

3. A full premixed gas water-cooled wall combustion device according to claim 1, characterized in that: The distance between adjacent water-cooled wall tubes is 1-2 mm, and the two-stage water-cooled wall units (6) are in contact with each other.

4. A full premixed gas water-cooled wall combustion device according to claim 1, characterized in that: It also includes a semi-enclosed shell structure, in which the two-stage water-cooled wall unit (6), the safety fire-fighting net (5) and the water-cooled combustion head (4) are all installed, and the two ends of the two-stage water-cooled wall unit (6) and the safety fire-fighting net (5) are respectively fixed to the two side end plates parallel to the semi-enclosed shell structure.

5. The full premixed gas water-cooled wall combustion device according to claim 1, characterized in that: The water-cooled wall tube is a cylindrical pipe structure, which is made of stainless steel 316L and alloy.

6. The full premixed gas water-cooled wall combustion device according to claim 1, characterized in that: The ratio between air and gas after being compressed by the high-pressure blower is 1:

9.

7. The full premixed gas water-cooled wall combustion device according to claim 1, characterized in that: The high-pressure fan adopts a double-impeller high-pressure fan, and its internal pressure range is 30~45kpa.

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