Dyeing water heating equipment of overflow dye vat

Abstract

The utility model belongs to the field of dyeing water heating, and particularly relates to dyeing water heating equipment of an overflow dye vat. The first-stage gas / liquid heat exchanger and the second-stage gas / liquid heat exchanger are connected with the dye vat through thermal insulation pipelines; the same second air blower is connected between the primary gas / liquid heat exchanger and the secondary gas / liquid heat exchanger through a pipeline; one side of the gas / gas heat exchanger is connected with a first air blower through a pipeline, and a first gas flow regulating valve is arranged on the pipeline between the gas / gas heat exchanger and the first air blower; the combustion chamber is connected with the first air blower; according to the utility model, a large amount of scale in the heat exchange tube can be avoided, and even if a small amount of scale is used for a long time, the heat exchange tube cannot be damaged due to the fact that the heat exchange tube is not in contact with high-temperature flame. And the heat exchange tube only needs to be regularly cleaned by a medicament.

Description

Technical Field

[0001] This utility model relates to the field of dyeing water heating technology, and in particular to a dyeing water heating device for an overflow dyeing vat. Background Technology

[0002] In general, most dyeing and printing plants use low-pressure, high-temperature steam generated by nearby power plants as the heat source for heating the overflow dyeing vat. This process is mature and economical. However, some dyeing and printing plants do not have power plants nearby and can only use natural gas combustion as a heat source. They first use a natural gas boiler to generate steam, and then use the steam to heat the dyeing water. This method has low heat conversion efficiency and high cost, resulting in a lack of product competitiveness.

[0003] To address this issue, some equipment manufacturers have designed a heat exchanger that directly heats the dyeing process water using burning natural gas. The natural gas burns inside the exchanger's cylindrical body, which has an annular cavity around its outer perimeter. This system holds the dyeing process water and boasts high heat conversion efficiency, comparable to using steam from a thermal power plant. However, because the dyeing process water contains a large amount of additives and has a high ion concentration, direct heating with a natural gas flame at temperatures exceeding 1000℃ easily causes scale buildup on the inner surface of the exchanger. Over time, this scale impairs heat conduction, leading to deformation and damage to the heater body and heat pipes caused by the high temperatures of natural gas combustion. This results in frequent equipment malfunctions, low operating rates, and high maintenance costs.

[0004] Therefore, we propose a dyeing water heating device for an overflow dyeing vat to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as the accumulation of scale on the inner surface of the heat exchanger due to high temperatures. After long-term use, this scale hinders heat conduction, causing deformation and damage to the heater body and heat pipes due to the high temperatures generated by natural gas combustion, resulting in frequent equipment failures, low operating rates, and high maintenance costs. The invention proposes a dyeing water heating device for an overflow dyeing tank.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A dyeing water heating device for an overflow dyeing vat includes:

[0008] Dye vat;

[0009] A primary gas / liquid heat exchanger and a secondary gas / liquid heat exchanger are provided, both of which are connected to the dyeing vat via insulated pipes; and the primary and secondary gas / liquid heat exchangers are connected to the same second blower via pipes.

[0010] A gas / gas heat exchanger, wherein one side of the gas / gas heat exchanger is connected to a first blower via a pipe, and a first gas flow regulating valve is provided on the pipe between the gas / gas heat exchanger and the first blower;

[0011] The combustion chamber is connected to the first blower;

[0012] A burner, wherein the burner is disposed outside the combustion chamber;

[0013] The temperature sensor is located inside the primary gas / liquid heat exchanger.

[0014] The temperature controller is connected to both the temperature sensor and the burner.

[0015] Preferably, the secondary gas / liquid heat exchanger is connected to the primary gas / liquid heat exchanger and the gas / gas heat exchanger via pipelines, and a second gas flow regulating valve is provided on the pipeline between the secondary gas / liquid heat exchanger and the primary gas / liquid heat exchanger.

[0016] Preferably, the gas / gas heat exchanger consists of multiple sets of heat exchange plates, upper and lower bases, and four angle steels.

[0017] Preferably, the heat exchange plate is welded from rectangular tubes, short square tubes and thin steel sheets, wherein the rectangular tubes are used for fixing and sealing, and the short square tubes are used to support adjacent thin steel sheets to form channels with a certain spacing; two adjacent heat exchange plates are arranged in a cross manner to form many individual and vertically sealed square channels for cold and hot air.

[0018] Preferably, both the primary gas / liquid heat exchanger and the secondary gas / liquid heat exchanger consist of a water inlet, a water outlet, an air inlet, an air outlet, and multiple heat exchange tubes. The heat exchange tubes contain dyeing process water to be exchanged, and multiple thin steel fins for heat absorption are wound around the heat exchange tubes to improve heat exchange efficiency.

[0019] The beneficial effects of the dyeing water heating device for the overflow dyeing vat described in this utility model are as follows:

[0020] This invention designs a device for heating dyeing process water using high-temperature circulating hot air. The dyeing process water flows through the heat exchange tubes of a two-stage finned gas / liquid heat exchanger. A circulating fan causes high-temperature hot air to flow outside the heat exchange tubes of the two-stage heat exchanger, exchanging heat with the dyeing process water and thus heating it. When the hot air temperature decreases, a thermostat controls the burner to turn on, raising the hot air temperature. Once the set temperature is reached, the burner turns off. Because the flame produced by the burner does not directly contact the heat exchange tubes, and because the maximum temperature requirement for the dyeing process water is below 135℃, the temperature of the hot air in contact with the heat exchange tubes can be controlled below 200℃. The relatively low hot air temperature avoids excessive scaling in the heat exchange tubes. Even if a small amount of scaling occurs after long-term use, it will not damage the heat exchange tubes because they do not come into contact with the high-temperature flame. Regular cleaning of the heat exchange tubes with a chemical agent is sufficient. Because the burner blows some fresh air into the circulating hot air during operation, the flue gas storage tank needs to discharge a portion of the flue gas. Before discharge, the flue gas passes through a gas / gas heat exchanger so that the heat in it is absorbed by the blown-in fresh air, thereby improving thermal efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a dyeing water heating device for an overflow dyeing vat proposed in this utility model;

[0022] Figure 2 A wind direction diagram of the gas / gas heat exchanger for a dyeing water heating device for an overflow dyeing vat proposed in this utility model;

[0023] Figure 3 This is a schematic diagram of the gas / gas heat exchanger of a dyeing water heating device for an overflow dyeing vat proposed in this utility model.

[0024] Figure 4 This is a schematic diagram of the heat exchange plate structure of a dyeing water heating device for an overflow dyeing vat proposed in this utility model;

[0025] Figure 5 This is a schematic diagram of the gas / liquid heat exchanger of the dyeing water heating device for an overflow dyeing vat proposed in this utility model.

[0026] In the diagram: 1. Dyeing vat; 2. Primary gas / liquid heat exchanger; 3. Temperature sensor; 4. Temperature controller; 5. Burner; 6. First blower; 7. Second gas flow regulating valve; 8. First gas flow regulating valve; 9. Gas / gas heat exchanger; 10. Secondary gas / liquid heat exchanger; 11. Second blower; 12. Air inlet; 13. Water inlet; 14. Air outlet; 15. Water outlet; 16. Heat exchange tube; 17. Rectangular tube; 18. Short square tube; 19. Thin steel sheet; 20. Base; 21. Heat exchange plate; 22. Angle steel. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Example

[0029] Reference Figures 1-5 A dyeing water heating device for an overflow dyeing vat, comprising:

[0030] Dye vat 1;

[0031] The primary gas / liquid heat exchanger 2 and the secondary gas / liquid heat exchanger 10 are both connected to the dyeing vat 1 via insulated pipes; and the primary gas / liquid heat exchanger 2 and the secondary gas / liquid heat exchanger 10 are connected to the same second blower 11 via pipes.

[0032] A gas / gas heat exchanger 9 is provided, with a first blower 6 connected to one side of the gas / gas heat exchanger 9 via a pipe, and a first gas volume regulating valve 8 is provided on the pipe between the gas / gas heat exchanger 9 and the first blower 6.

[0033] The combustion chamber is connected to the first blower 6;

[0034] Burner 5 is located on the outside of the combustion chamber;

[0035] Temperature sensor 3 is installed inside the primary gas / liquid heat exchanger 2;

[0036] Temperature controller 4 is connected to temperature sensor 3 and burner 5 respectively.

[0037] In this embodiment, the secondary gas / liquid heat exchanger 10 is connected to the primary gas / liquid heat exchanger 2 and the gas / gas heat exchanger 9 respectively through pipelines, and a second gas flow regulating valve 7 is provided on the pipeline between the secondary gas / liquid heat exchanger 10 and the primary gas / liquid heat exchanger 2.

[0038] In this embodiment, the gas / gas heat exchanger 9 consists of multiple sets of heat exchange plates 21, two upper and lower bases 20, and four angle steels 22.

[0039] In this embodiment, the heat exchange plate 21 is welded from a rectangular tube 17, a short square tube 18 and a thin steel sheet 19. The rectangular tube 17 is used for fixing and sealing, and the short square tube 18 is used to support the adjacent thin steel sheets 19 to form channels with a certain spacing. Two adjacent heat exchange plates 21 are arranged in a cross manner to form many individual and vertically sealed square channels for cold and hot air.

[0040] In this embodiment, both the primary gas / liquid heat exchanger 2 and the secondary gas / liquid heat exchanger 10 are composed of a water inlet 13, a water outlet 15, an air inlet 12, an air outlet 14, and multiple heat exchange tubes 16. The heat exchange tubes 16 contain dyeing process water to be exchanged, and multiple thin steel fins for absorbing heat are wound around the heat exchange tubes 16 to improve heat exchange efficiency.

[0041] In this invention, the dyeing water heating process is as follows:

[0042] The dyeing water circulates continuously through insulated pipes between dyeing vat 1, primary gas / liquid heat exchanger 2, and secondary gas / liquid heat exchanger 10 for heat exchange and heating. Fresh air, under the pull of the first blower 6, enters the combustion chamber after heat exchange and heating through the gas / gas heat exchanger 9. A first gas flow regulating valve 8 is installed on the pipe, and a burner 5 is installed outside the combustion chamber. The temperature inside the primary gas / liquid heat exchanger 2 is measured by a temperature sensor 3, and the temperature controller 4 controls the opening of the burner 5 based on the measured temperature to ensure the temperature inside the primary gas / liquid heat exchanger 2 is stable. The high-temperature gas in the combustion chamber enters the primary gas / liquid heat exchanger 2, which contains numerous heat exchange tubes 16. Dyeing process water flows within these tubes for gas-liquid heat exchange. After heat exchange, the dyeing process water enters the dyeing vat 1 through a pipe. The high-temperature flue gas, after heat exchange, enters the secondary gas / liquid heat exchanger 10 via a second blower 11 to perform secondary heat exchange on the dyeing process water. The dyeing process water in the dyeing vat 1 then enters the secondary gas / liquid heat exchanger 10 through an insulated pipe. The heat-exchanged process water then enters the primary gas / liquid heat exchanger 2, undergoing repeated circulation and heating. Part of the flue gas passing through the secondary gas / liquid heat exchanger 10 re-enters the primary gas / liquid heat exchanger 2 via a second gas flow regulating valve 7, while the other part enters the gas / gas heat exchanger 9. Here, it exchanges heat with ambient temperature fresh air, raising its temperature before being discharged as exhaust gas and no longer used. The reheated fresh air then enters the combustion chamber.

[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A dyeing water heating device for an overflow dyeing vat, characterized in that, It comprises: a dye vat (1); a primary gas / liquid heat exchanger (2) and a secondary gas / liquid heat exchanger (10), which are connected with the dye vat (1) through heat preservation pipes; and a second air blower (11) is connected between the primary gas / liquid heat exchanger (2) and the secondary gas / liquid heat exchanger (10) through a pipe; a gas / gas heat exchanger (9), one side of which is connected with a first air blower (6) through a pipe, and a first air quantity adjusting valve (8) is arranged on the pipe between the gas / gas heat exchanger (9) and the first air blower (6); a combustion chamber, which is connected with the first air blower (6); a burner (5), which is arranged outside the combustion chamber; a temperature sensor (3), which is arranged inside the primary gas / liquid heat exchanger (2); a temperature controller (4), which is connected with the temperature sensor (3) and the burner (5) respectively.

2. A dyeing water heating device for an overflow dyeing jig according to claim 1, characterized in that, The secondary gas / liquid heat exchanger (10) is connected with the primary gas / liquid heat exchanger (2) and the gas / gas heat exchanger (9) through pipes respectively, and a second air quantity adjusting valve (7) is arranged on the pipe between the secondary gas / liquid heat exchanger (10) and the primary gas / liquid heat exchanger (2).

3. A dyeing water heating device for an overflow dyeing jig according to claim 1, characterized in that, The gas / gas heat exchanger (9) is composed of multiple groups of heat exchange fins (21), two upper and lower bases (20) and four angle steels (22).

4. A dyeing water heating device for an overflow dyeing jig according to claim 3, characterized in that, The heat exchange fin (21) is welded by an oblong pipe (17), a short square pipe (18) and a thin steel sheet (19), wherein the oblong pipe (17) is used for fixing and sealing, the short square pipe (18) is used for supporting adjacent thin steel sheets (19) to form a certain interval passage; two adjacent heat exchange fins (21) are cross-placed to form many single and vertically sealed cold gas and hot gas square passages.

5. The apparatus according to claim 1, wherein The primary gas / liquid heat exchanger (2) and the secondary gas / liquid heat exchanger (10) are both composed of a water inlet end (13), a water outlet end (15), an air inlet end (12), an air outlet end (14) and multiple heat exchange pipes (16), the heat exchange pipe (16) has dyeing process water to be exchanged in it, and multiple thin steel fins for absorbing heat are wound on the heat exchange pipe (16) to improve the heat exchange efficiency.

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