A novel gas-fired heating device for dyeing vats

Abstract

This utility model discloses a novel gas-fired heating device for dyeing and printing vats, relating to the field of dyeing and printing technology. It includes a shell and an inner shell coaxially disposed within the shell. A cavity is formed between the shell and the inner shell to allow high-temperature flue gas to circulate. The channel inside the inner shell is a first channel, and the cavity between the shell and the inner shell is a second channel. A first tube sheet and a second tube sheet are respectively connected to both ends of the shell. An inner tube is installed at one end of the inner shell, passing through the corresponding side of the second tube sheet and communicating with the inner shell. The flue gas diversion cavity of this utility model uniformly diverts the high-temperature flue gas before it enters the second channel from the first channel, ensuring a uniform distribution of high-temperature flue gas entering the annular second channel. This, in turn, ensures uniform heat distribution within the channel through which the high-temperature flue gas circulates, achieving uniform heat exchange during the heat exchange stage. This avoids uneven heat exchange of the dye liquor during dyeing and printing vat heating, ensuring production quality.

Description

Technical Field

[0001] This utility model relates to the field of printing and dyeing technology, and in particular to a novel gas-fired heating device for printing and dyeing vats. Background Technology

[0002] As a traditional high-energy-consuming industry, the dyeing and printing industry faces enormous pressure to reduce carbon emissions. Most regions are promoting the use of clean energy, thus creating a significant need for upgrading and retrofitting production enterprises that rely on coal-fired boilers. Currently, to reduce energy loss and environmental pollution, gas-fired heating devices for dyeing vats are being used.

[0003] In the prior art, patent application number CN202411170850.6, titled "Gas-fired Heating Device for Dyeing and Printing Vats," describes a device that is small in size, low in energy consumption, and safe and reliable. The technical solution is a gas-fired heating device for dyeing and printing vats, comprising a heat exchange unit and a combustion unit. The heat exchange unit has a first channel and a second channel arranged internally and externally, as well as several heat exchange tubes passing through both channels. One side of the heat exchange unit has a water inlet, and the other side has a water outlet, a flue gas inlet, and a flue gas outlet. The flue gas inlet, the first channel, the second channel, and the flue gas outlet are sequentially connected, with the flue gas flow directions of the first and second channels being opposite. The combustion unit is connected to the flue gas inlet. The water inlet, the heat exchange tubes, and the water outlet are sequentially connected. In this solution, the combustion unit, which supplies heat, transports high-temperature flue gas through the first and second channels, and, in conjunction with the heat exchange unit, achieves gas-fired heating of the dyeing and printing vat.

[0004] However, in the aforementioned patented technology, since the high-temperature flue gas first enters the first channel and then flows in the opposite direction along the second annular channel, if the flow of the high-temperature flue gas is uneven when it enters the second channel, there will be differences in the flue gas content at different positions in the channel after entering the second channel, which will lead to uneven heat distribution. This will also cause differences in heat exchange during the heat exchange stage, resulting in uneven heat exchange of the dye liquor in the dyeing and printing dyeing vat, which will affect the production quality.

[0005] Therefore, based on the above-mentioned technical problems, those skilled in the art urgently need to develop a new type of gas-fired heating device for dyeing and printing vats. Utility Model Content

[0006] The purpose of this invention is to provide a novel gas-fired heating device for dyeing and printing cylinders that enables the high-temperature flue gas of the gas-fired heating device to be evenly distributed in the flow channel to achieve uniform heat exchange.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] This utility model discloses a novel gas-fired heating device for a dyeing vat, comprising an outer shell and an inner shell coaxially disposed inside the outer shell. A cavity is formed between the outer shell and the inner shell to allow high-temperature flue gas to circulate. The channel inside the inner shell is a first channel, and the cavity formed between the outer shell and the inner shell is a second channel. A first tube plate and a second tube plate are respectively connected to both ends of the outer shell. An inner tube is provided at one end of the inner shell, which passes through the second tube plate on the corresponding side and communicates with the inner shell. A space is left between the other end of the inner shell and the first tube plate on the corresponding side to connect the first channel and the second channel. The high-temperature flue gas flows in opposite directions in the first channel and the second channel.

[0009] A flue gas diversion cavity is provided inside the inner shell at one end opposite to the inner tube. The flue gas diversion cavity is used to evenly disperse the high-temperature flue gas in the first channel into the second channel.

[0010] Furthermore, a burner assembly is installed inside the inner tube, and the inside of the inner tube is a smoke inlet connected to the first channel.

[0011] Furthermore, an annular pipe and an opening connecting the annular pipe to the outer casing are provided on the outer side of the end near the second tube sheet, and a smoke exhaust port is provided on the top of the annular pipe.

[0012] Furthermore, the flue gas diversion cavity includes a diversion column coaxially disposed inside the inner shell. The diversion column is located inside the inner shell at one end opposite to the inner tube. One end of the diversion column extends out of the inner shell and is fixedly connected to the first tube sheet, and the other end is provided with a cylindrical smoke collection cavity. Multiple flue gas diversion ports that communicate with the cylindrical smoke collection cavity are evenly distributed circumferentially on the side of the diversion column.

[0013] The port at one end of the diversion column, which has the cylindrical smoke collection chamber, extends outward in an arc shape to form a trumpet-shaped structure. The end of the trumpet-shaped structure of the diversion column is fixedly connected to the inner wall of the inner shell.

[0014] Furthermore, a third channel is formed between the diversion column and the inner wall of the inner shell.

[0015] Furthermore, the third channel is connected to the second channel, and the third channel is connected to the first channel through the flue gas diversion port.

[0016] This utility model has the following beneficial effects.

[0017] The flue gas diversion chamber of this invention allows for the uniform diversion of high-temperature flue gas before it enters the second channel from the first channel. This ensures that the high-temperature flue gas is evenly distributed in the annular second channel, thereby achieving uniform heat distribution within the channel through which the high-temperature flue gas flows. This results in uniform heat exchange during the heat exchange stage, avoiding uneven heat exchange of the dye liquor during the dyeing and printing process and ensuring production quality. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of the structure of a novel gas-fired heating device for dyeing and printing vats provided in this embodiment of the present utility model;

[0020] Figure 2 A schematic diagram of the distribution of flue gas diversion ports on the diversion column of a novel gas heating device for dyeing and printing vats provided in this embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Outer shell; 2. Inner shell; 3. First channel; 4. Second channel; 5. First tube sheet; 6. Second tube sheet; 7. Inner tube; 8. Burner assembly; 9. Ring tube; 10. Opening; 11. Exhaust port; 12. Diverter column; 13. Cylindrical smoke collection chamber; 14. Flue gas diversion port; 15. Third channel. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, a further detailed description of this utility model will be provided below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] See Figures 1 to 2 As shown;

[0025] This embodiment discloses a novel gas-fired heating device for a dyeing vat, comprising a shell 1 and an inner shell 2 coaxially disposed inside the shell 1. A cavity is formed between the shell 1 and the inner shell 2 to allow high-temperature flue gas to circulate. The channel inside the inner shell 2 is a first channel 3, and the cavity formed between the shell 1 and the inner shell 2 is a second channel 4. A first tube sheet 5 and a second tube sheet 6 are respectively connected to both ends of the shell 1, forming a closed channel structure between the shell 1 and the inner shell 2, and connecting the first channel 3 and the second channel 4. A heat exchange tube for introducing dyeing liquor is connected between the first tube sheet 5 and the second tube sheet 6, allowing the dyeing liquor to exchange heat with the high-temperature flue gas flowing in the first channel 3 and the second channel 4 during its flow within the heat exchange tube. An inner tube 7 is provided at one end of the inner shell 2. Pipe 7 passes through the second tube sheet 6 on the corresponding side and is connected to the inner shell 2. The other end of the inner shell 2 and the first tube sheet 5 on the corresponding side leave a space to connect the first channel 3 and the second channel 4. The high-temperature flue gas flows in opposite directions in the first channel 3 and the second channel 4. That is, the high-temperature flue gas in the first channel 3 flows to the position of the first tube sheet 5 and then flows in the opposite direction along the second channel 4. During the process of the high-temperature flue gas from the first channel 3 to the second channel 4, the high-temperature flue gas will be dispersed to different degrees at different positions. This causes the high-temperature flue gas flowing in the annular second channel 4 to have different flue gas content at different positions, resulting in uneven heat distribution. This will also lead to heat exchange differences in the heat exchange stage, resulting in uneven heat exchange of the dye liquor in the dyeing and printing dyeing vat, which affects the production quality.

[0026] A flue gas diversion chamber is provided inside the inner shell 2 at one end opposite to the inner tube 7. The flue gas diversion chamber is used to evenly distribute the high-temperature flue gas in the first channel 3 to the second channel 4. In this way, the high-temperature flue gas is evenly diverted before entering the second channel 4, so that the high-temperature flue gas flowing in the second channel 4 is evenly distributed, thereby achieving uniform heat distribution and uniform heat exchange, and ensuring production quality.

[0027] Furthermore, a burner assembly 8 is installed inside the inner tube 7 to generate high-temperature flue gas. The inside of the inner tube 7 is a flue gas inlet connected to the first channel 3. The high-temperature flue gas enters the first channel 3 from the flue gas inlet to supply heat energy to the gas heating device for the dyeing and printing vat.

[0028] Furthermore, an annular pipe 9 and an opening 10 connecting the annular pipe 9 to the outer surface of the outer shell 1 near the second tube sheet 6 are provided. A flue gas outlet 11 is provided at the top of the annular pipe 9. High-temperature flue gas flows from the second channel 4 to the opening 10 and enters the annular pipe 9 so that the lower-temperature flue gas after heat exchange can be discharged from the flue gas outlet 11, so that high-temperature flue gas can be continuously supplied in the first channel 3 and the second channel 4.

[0029] Furthermore, the flue gas diversion cavity includes a diversion column 12 coaxially disposed inside the inner shell 2. The diversion column 12 is located inside the inner shell 2 at one end opposite to the inner tube 7. One end of the diversion column 12 extends out of the inner shell 2 and is fixedly connected to the first tube sheet 5, and the other end is provided with a cylindrical smoke collection cavity 13. Multiple flue gas diversion ports 14 are evenly distributed on the side of the diversion column 12 and are connected to the cylindrical smoke collection cavity 13.

[0030] The port of one end of the diversion column 12, which has a cylindrical smoke collection chamber 13, extends outward in an arc shape to form a trumpet-shaped structure. The end of the trumpet-shaped structure of the diversion column 12 is fixedly connected to the inner wall of the inner shell 2.

[0031] Specifically, the funnel-shaped end of the diverter column 12 is fixedly connected to the inner wall of the inner shell 2, allowing the high-temperature flue gas in the first channel 3 to smoothly enter the cylindrical smoke collection chamber 13 along the funnel-shaped end of the diverter column 12. The cylindrical smoke collection chamber 13 of the diverter column 12 causes the high-temperature flue gas in the first channel 3 to accumulate, and the diameter of the cylindrical smoke collection chamber 13 is smaller than that of the first channel 3, thus increasing the pressure. The high-temperature flue gas will be evenly discharged from multiple circumferentially distributed flue gas diversion ports 14, achieving uniform diversion of the high-temperature flue gas. At the same time, one end of the diverter column 12 extends out of the inner shell 2 and is fixedly connected to the first tube sheet 5. Therefore, the high-temperature flue gas evenly discharged from multiple flue gas diversion ports 14 will not move towards the middle position and mix, resulting in uneven dispersion into the second channel 4, but can only flow quickly and evenly into the second channel 4.

[0032] Furthermore, a third channel 15 is formed between the diversion column 12 and the inner wall of the inner shell 2. Therefore, the high-temperature flue gas flows sequentially from the first channel 3 into the cylindrical smoke collection chamber 13, the third channel 15, and the second channel 4 to achieve uniform flow of the high-temperature flue gas.

[0033] Furthermore, the third channel 15 is connected to the second channel 4, and the third channel 15 is connected to the first channel 3 through the flue gas diversion port 14, so as to realize the uniform flow channel of the entire high-temperature flue gas, thereby enabling the high-temperature flue gas to be evenly diverted, so that the high-temperature flue gas flowing in the second channel 4 is evenly distributed, so as to achieve uniform heat distribution and uniform heat exchange, and ensure production quality.

[0034] The novel gas-fired heating device for dyeing vats provided by this utility model, as described above, has the following beneficial effects:

[0035] The flue gas diversion chamber of this invention allows for the uniform diversion of high-temperature flue gas before it enters the second channel from the first channel. This ensures that the high-temperature flue gas is evenly distributed in the annular second channel, thereby achieving uniform heat distribution within the channel through which the high-temperature flue gas flows. This results in uniform heat exchange during the heat exchange stage, avoiding uneven heat exchange of the dye liquor during the dyeing and printing process and ensuring production quality.

[0036] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A novel gas-fired heating device for a dyeing vat, comprising a housing (1) and an inner shell (2) coaxially disposed inside the housing (1), wherein a cavity is formed between the housing (1) and the inner shell (2) to allow high-temperature flue gas to circulate, the channel inside the inner shell (2) being a first channel (3), and the cavity formed between the housing (1) and the inner shell (2) being a second channel (4), characterized in that, The outer shell (1) is connected to a first tube sheet (5) and a second tube sheet (6) at both ends respectively. An inner tube (7) is provided at one end of the inner shell (2). The inner tube (7) passes through the second tube sheet (6) on the corresponding side and is connected to the inner shell (2). A space is left between the other end of the inner shell (2) and the first tube sheet (5) on the corresponding side to connect the first channel (3) and the second channel (4). The high-temperature flue gas flows in opposite directions in the first channel (3) and the second channel (4). A flue gas diversion cavity is provided inside the inner shell (2) at one end opposite to the inner tube (7). The flue gas diversion cavity is used to evenly disperse the high-temperature flue gas in the first channel (3) into the second channel (4).

2. A novel gas heating device for printing and dyeing vat according to claim 1, characterized in that, The inner tube (7) is provided with a burner assembly (8), and the inside of the inner tube (7) is a smoke inlet connected to the first channel (3).

3. A novel gas heating device for printing and dyeing vat according to claim 1, characterized in that, An annular pipe (9) and an opening (10) connecting the annular pipe (9) to the outer surface of the outer casing (1) near the second tube sheet (6) are provided. A smoke exhaust port (11) is provided at the top of the annular pipe (9).

4. A novel gas heating device for printing and dyeing vat according to claim 1, characterized in that, The flue gas diversion cavity includes a diversion column (12) coaxially disposed inside the inner shell (2). The diversion column (12) is located inside the inner shell (2) at one end opposite to the inner tube (7). One end of the diversion column (12) extends out of the inner shell (2) and is fixedly connected to the first tube sheet (5). The other end is provided with a cylindrical smoke collection cavity (13). The side of the diversion column (12) is provided with a plurality of flue gas diversion ports (14) that are connected to the cylindrical smoke collection cavity (13) in a circumferentially evenly distributed manner. The port of the diversion column (12) with the cylindrical smoke collection cavity (13) extends outward in an arc shape to form a trumpet-shaped structure. The end of the trumpet-shaped structure of the diversion column (12) is fixedly connected to the inner wall of the inner shell (2).

5. A novel gas-fired heating device for dyeing and printing vats according to claim 4, characterized in that, A third channel (15) is formed between the diversion column (12) and the inner wall of the inner shell (2).

6. A novel gas heating device for printing and dyeing vat according to claim 5, characterized in that, The third channel (15) is connected to the second channel (4), and the third channel (15) is connected to the first channel (3) through the flue gas diversion port (14).

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