Fuel gas heating device for printing and dyeing dye vat
Through the internal and external heat exchange tube structure and concentric circle heat exchange tube, the existing dye tank heating device has solved the problems of high energy consumption and high safety hazards, and the dye tank heating effect with low energy consumption and high safety is achieved.
Patent Information
- Application Number
- CN202422071897.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-08-26
AI Technical Summary
The existing dye tank heating devices have problems such as high energy consumption, large environmental pollution, serious heat loss and many safety hazards.
The heat exchange tube structure is adopted with an internal and external arrangement. During the shell process, the high-temperature flue gas is in the shell process and the dye liquid is heat exchanged through the internal and external heat exchange tubes to reduce the capacity and heat storage of the dye liquid. The heat exchange tube structure arranged in a concentric circle is adopted to improve the heat transfer efficiency.
It realizes low-energy consumption and high-safety dye tank heating, reduces heat storage and dye liquid capacity, reduces usage costs, improves heat transfer efficiency and device safety.
Smart Images
Figure CN223150840U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of printing and dyeing, in particular to a gas heating device for a printing and dyeing vat. Background Art
[0002] For enterprises engaged in dyeing production, the heating devices for vats in the prior art all adopt heating methods using steam (power plant steam or coal-fired boiler steam), heat-conducting oil, or electricity: fuel is used to preheat a heat-conducting medium as a heat carrier (heat-conducting oil or steam), and then the heat carrier releases energy to heat the circulating water in the vat, so as to achieve the purpose of heating the materials in the vat. This belongs to secondary energy heating and causes serious environmental pollution. At the same time, during the heating and transportation processes of the heat-conducting carrier, heat loss (more than 15%) is often inevitably generated. In addition, the heating equipment for the heat-conducting medium requires additional space and operating management personnel, resulting in serious environmental pollution, high energy consumption, and high usage costs.
[0003] Natural gas is a highly efficient clean energy source. After combustion, it produces carbon dioxide and water, and basically has no emissions of atmospheric pollutants. Therefore, with the transportation and popularization of natural gas, switching to clean and efficient natural gas heating has become the first choice for heating energy of governments and enterprises at all levels.
[0004] At present, there are also vat heating devices using natural gas, which adopt a fire-tube boiler structure. High-temperature flue gas is in the tube side, and the dye solution is heated in the shell side. Due to the huge volume of the shell side (generally greater than 200 liters) and relatively large heat storage, the energy consumption increases correspondingly due to the increase in the dye solution during multiple heating and cooling processes. In addition, the large heat storage also poses adverse factors such as potential safety hazards. Summary of the Utility Model
[0005] The purpose of the utility model is to overcome the deficiencies in the above background art and provide a gas heating device for a printing and dyeing vat, which should have the characteristics of small volume, low energy consumption, safety, and reliability.
[0006] The technical solution of the utility model is as follows:
[0007] A gas heating device for a printing and dyeing vat includes a heat exchange unit and a combustion unit; characterized in that: the heat exchange unit is provided with a first channel and a second channel arranged inside and outside, and a number of heat exchange tubes passing through both the first channel and the second channel. One side of the heat exchange unit is provided with a water inlet, and the other side is provided with a water outlet, a smoke inlet, and a smoke outlet; the smoke inlet, the first channel, the second channel, and the smoke outlet are sequentially connected, and the smoke flow directions in the first channel and the second channel are opposite; the combustion unit is connected to the smoke inlet; the water inlet, the heat exchange tubes, and the water outlet are sequentially connected.
[0008] The heat exchange unit includes a heat exchanger and a head assembly; the heat exchanger includes a housing, tube sheets fixed at both ends of the housing, and heat exchange tubes located in the housing and connecting the tube sheets at both ends; the heat exchange tubes include inner heat exchange tubes and outer heat exchange tubes, the inner heat exchange tubes are arranged in the first flue, and the outer heat exchange tubes are arranged in the second flue.
[0009] An inner housing is provided in the housing, the inner housing surrounds the inner heat exchange tubes and the right end of the inner housing is connected to the water outlet side tube sheet; the interior of the inner housing serves as the first channel, and the space between the inner housing and the housing serves as the second channel.
[0010] The head assembly includes a left blind cover provided at the left end of the heat exchanger, an annular tube provided on the right side of the heat exchanger, a right blind cover provided at the right end of the heat exchanger, and an inner tube; the left blind cover communicates with the heat exchange tubes and is provided with the water inlet; the annular tube communicates with the second flue and is provided with the smoke outlet; the inner tube passes through the right blind cover and communicates with the first flue, and the inner tube serves as the smoke inlet; the right blind cover communicates with the heat exchange tubes and is provided with the water outlet.
[0011] One layer of inner heat exchange tubes arranged around the central axis and closely attached to the inner wall of the inner housing is provided in the first channel; at least two layers of outer heat exchange tubes arranged around the central axis are provided in the second channel.
[0012] In the second channel, the outermost layer of outer heat exchange tubes is closely attached to the inner wall of the housing, and the innermost layer of outer heat exchange tubes is closely attached to the outer wall of the inner housing.
[0013] The inner heat exchange tubes are fixed to the inner housing through positioning plates; the outer heat exchange tubes are fixed to the inner wall of the housing and the outer wall of the inner housing through outer baffle plates and inner baffle plates respectively; the outer baffle plates and the inner baffle plates are arranged in sequence along the flue gas flow direction.
[0014] The water inlet is arranged obliquely downward; the water outlet is arranged vertically upward; the smoke outlet is arranged vertically upward.
[0015] The combustion unit includes a combustion tube communicating with the smoke inlet, a burner assembly, and a valve group.
[0016] The beneficial effects of the present utility model are as follows:
[0017] The gas heating device for a printing and dyeing vat provided by the present utility model adopts a heat exchange tube structure. High-temperature flue gas is in the shell side (the first flue and the second flue), and the dye liquor is in the tube side (in the heat exchange tubes). The tube side has a small capacity (generally less than 30 liters), the dye liquor has a small capacity, the heat exchange efficiency is high, the heat storage is small, the energy consumption is low, and the use cost is low. It can avoid the increase in energy consumption caused by increasing the dye liquor capacity during multiple heating and cooling processes, and has the characteristics of small volume, high safety, energy conservation and environmental protection, and low use cost. Description of the Drawings
[0018] Figure 1It is one of the three-dimensional structure schematic diagrams of the present utility model.
[0019] Figure 2 It is the second of the three-dimensional structure schematic diagrams of the present utility model.
[0020] Figure 3 It is the front view structure schematic diagram of the present utility model.
[0021] Figure 4 It is the cross-sectional structure schematic diagram of the present utility model.
[0022] Figure 5 It is the front view structure schematic diagram of the heat exchange unit of the present utility model.
[0023] Figure 6 It is the cross-sectional structure schematic diagram of the heat exchange unit of the present utility model.
[0024] Figure 7 It is the three-dimensional structure schematic diagram of the heat exchanger of the present utility model.
[0025] Figure 8 It is the left view structure schematic diagram of the heat exchanger of the present utility model.
[0026] Figure 9 It is the right view structure schematic diagram of the heat exchanger of the present utility model.
[0027] Figure 10 It is the schematic diagram of the flow direction of the flue gas of the present utility model.
[0028] Figure 11 It is the schematic diagram of the flow direction of the dyeing solution of the present utility model. Brief Description of the Drawings:
[0030] Heat exchange unit 1, water inlet 1-1, water outlet 1-2, flue gas inlet 1-3, flue gas outlet 1-4, outer shell 1.1, annular opening 1.1.1, tube sheet 1.2, water inlet side tube sheet 1.2.1, water outlet side tube sheet 1.2.2, inlet 1.2.3, inner heat exchange tube 1.3, outer heat exchange tube 1.4, first outer heat exchange tube 1.4.1, second outer heat exchange tube 1.4.2, inner shell 1.5, positioning plate 1.6, outer baffle 1.7, inner baffle 1.8, left blind cover 11, annular tube 12, right blind cover 13, inner tube 14, combustion unit 2, combustion tube 2.1, air inlet 2.1.1, burner assembly 2.2, valve group 2.3, first channel A, second channel B, central axis C. Detailed Description of the Preferred Embodiments
[0031] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model.
[0032] As shown Figure 1 in the figure, a gas heating device for a printing and dyeing vat includes a heat exchange unit 1 and a combustion unit 2.
[0033] As shown Figure 3 in the figure, the combustion unit is arranged at the right end of the heat exchange unit. The combustion unit mixes and burns natural gas and combustion-supporting air, and the heat generated by the combustion (high-temperature flue gas) is sent into the heat exchange unit. The circulating water (dye solution) of the vat also enters the heat exchange unit and exchanges heat with the high-temperature flue gas, so that the temperature of the circulating water of the vat rises and the temperature of the flue gas drops.
[0034] As shown Figure 4 in the figure, a water inlet 1-1 is arranged on the left side of the heat exchange unit, and a water outlet 1-2, a flue gas inlet 1-3 and a smoke exhaust outlet 1-4 are arranged on the right side of the heat exchange unit. The heat exchange unit includes a heat exchanger and a head assembly.
[0035] As shown Figure 4 in the figure, the heat exchanger includes a shell 1.1, tube sheets 1.2, heat exchange tubes, and an inner shell 1.5. The left and right ends of the shell are fixed with tube sheets, including a water inlet side tube sheet 1.2.1 arranged at the left end of the shell and a water outlet side tube sheet 1.2.2 arranged at the right end of the shell. The heat exchange tubes are arranged inside the shell, and the two ends of the heat exchange tubes are respectively connected to the water inlet side tube sheet and the water outlet side tube sheet. The inner shell is arranged inside the shell, the inner shell surrounds the inner heat exchange tubes, the inner shell is connected to the water outlet side tube sheet on the right, and the inner shell keeps a certain distance from the water inlet side tube sheet on the left, so the inner and outer regions of the inner shell are connected.
[0036] As shown Figure 10 in the figure, the inside of the inner shell is used as a first channel A, and the space between the inner shell and the outer shell is used as a second channel B. The left end of the first channel is connected to the left end of the second channel. The cross-section of the first channel is circular, and the cross-section of the second channel is an annular shape surrounding the first channel.
[0037] The heat exchange tubes include inner heat exchange tubes 1.3 and outer heat exchange tubes 1.4. As shown Figure 8 and Figure 9 in the figure, the inner heat exchange tubes and the outer heat exchange tubes are arranged concentrically inside and outside. The inner heat exchange tubes are arranged in the first flue. There is a layer of inner heat exchange tubes arranged around the central axis C of the heat exchange unit in the first channel. This layer of inner heat exchange tubes is closely attached to the inner wall of the inner shell. The inner heat exchange tubes and the inner shell form a water-cooled wall structure, and the inner heat exchange tubes are fixed to the inner wall of the inner shell through a plurality of positioning plates 1.6.
[0038] The external heat exchange tubes are arranged in the second flue. There are at least two layers of external heat exchange tubes arranged around the central axis in the second channel. Among them, the outermost external heat exchange tubes (the first external heat exchange tubes 1.4.1) are in close contact with the inner wall of the outer shell, and these external heat exchange tubes are fixed to the inner wall of the outer shell through external baffle plates 1.7. The innermost external heat exchange tubes (the second external heat exchange tubes 1.4.2) are in close contact with the outer wall of the inner shell, and these external heat exchange tubes are fixed to the outer wall of the inner shell through internal baffle plates 1.8.
[0039] The external baffle plates and the internal baffle plates are arranged in sequence along the flue gas flow direction ( Figure 10 the direction horizontally to the right in the figure). As Figure 9 shown, the number of the internal heat exchange tubes is 30, the number of the outermost external heat exchange tubes (the first external heat exchange tubes 1.4.1) is 54, and the number of the innermost external heat exchange tubes (the second external heat exchange tubes 1.4.2) is 26.
[0040] Since both the external baffle plates and the internal baffle plates are fixed to the external heat exchange tubes, the external baffle plates are fixed to the outer shell, the internal baffle plates are fixed to the inner shell, the external heat exchange tubes are in close contact with the outer shell and the inner shell respectively, and the positioning plates are fixed to the internal heat exchange tubes and the inner shell, they can all play the role of fins and improve the heat transfer efficiency.
[0041] The head assembly includes a left blind cover 11, an annular pipe 12, a right blind cover 13, and an inner pipe 14.
[0042] As Figure 4 shown, the left blind cover is fixed to the left end of the outer shell of the heat exchanger. The left blind cover completely covers the water inlet side tube sheet. The inside of the left blind cover is communicated with the heat exchange tubes. The lower half of the left blind cover is provided with the water inlet, and the water inlet is arranged obliquely downward.
[0043] The annular pipe surrounds the outer shell of the heat exchanger. There is an annular opening 1.1.1 on the right side of the outer shell. The inside of the annular pipe is communicated with the second flue through the annular opening. The smoke exhaust port is provided at the top of the annular pipe, and the smoke exhaust port is arranged vertically upward.
[0044] The inner pipe and the right blind cover are located at the right end of the heat exchanger. The inner pipe axially passes through the right blind cover. The left end of the inner pipe is fixed to the water outlet side tube sheet. An inlet 1.2.3 is provided at the center of the water outlet side tube sheet. The inner pipe is communicated with the first flue through the inlet. The right end of the inner pipe serves as the smoke inlet.
[0045] The right blind cover surrounds the inner pipe and is also fixed to the right end of the outer shell of the heat exchanger. The right blind cover completely covers the water outlet side tube sheet. The inside of the right blind cover is communicated with the heat exchange tubes. The water outlet is provided at the top of the right blind cover, and the water outlet is arranged vertically upward.
[0046] The smoke inlet, the first channel, the second channel and the smoke exhaust port are communicated in sequence and the flue gas flow directions of the first channel and the second channel are opposite. As Figure 10As shown, the air flow direction of the first channel is horizontally to the left, and the air flow direction of the second channel is horizontally to the right. The water inlet, the heat exchange tube and the water outlet are connected in sequence. As Figure 11 shown, the water flow direction of the inner heat exchange tube and the outer heat exchange tube is horizontally to the right.
[0047] The combustion unit includes a combustion tube 2.1, a burner assembly 2.2, and a valve group 2.3. As Figure 4 shown, an air inlet 2.1.1 is provided at the bottom of the combustion tube, the air inlet is arranged vertically downward, and the left end of the combustion tube is connected to the smoke inlet of the inner tube. The burner assembly is arranged inside the combustion tube, and the valve group extends into the combustion tube and is also connected to the burner assembly. An igniter is also provided inside the combustion tube.
[0048] The working principle of the present utility model is as follows:
[0049] 1. Combustion-supporting air enters the combustion tube through the air inlet, natural gas and combustion-supporting air are mixed and burned in the burner assembly, and the generated high-temperature flue gas sequentially passes through the smoke inlet, the inner tube, the first channel, the second channel and the annular tube, and finally is discharged through the smoke outlet; the dye liquor sequentially passes through the water inlet, the left blind cover, the heat exchange tube and the right blind cover, and finally is discharged through the water outlet;
[0050] 2. The flue gas travels in the first channel and the second channel, and the dye vat circulating water (dye liquor) travels in the inner heat exchange tube and the outer heat exchange tube. The flue gas enters the heat exchange unit as a heat carrier and exchanges heat with the dye liquor to heat the dye liquor;
[0051] 3. The high-temperature flue gas enters the first channel, and the working condition of the first channel is 800 - 1300 °C; the water-cooled wall structure composed of the inner heat exchange tube and the inner shell can effectively absorb the radiant heat of the high-temperature flue gas, improve the heat transfer efficiency, avoid the inner shell directly contacting the high temperature, extend the service life, and greatly reduce the flue gas temperature;
[0052] 4. After being cooled in the first channel, the low-temperature flue gas enters the second channel, and the working condition of the second channel is 100 - 600 °C; the outer heat exchange tube exchanges heat with the low-temperature flue gas again to further utilize the waste heat of the flue gas. The outer baffle and the inner baffle guide the low-temperature flue gas to flow tortuously in the second channel, increasing the moving distance and improving the heat transfer efficiency.
[0053] The characteristics of the present utility model are as follows:
[0054] I. The integrated structure of the combustion space and the heat exchange unit
[0055] 1. Different from the heat exchange tubes arranged in a triangular shape in the traditional heat exchanger, the heat exchange tubes of the present utility model adopt a concentric circle arrangement method, and the heat exchange tubes are arranged in layers. One layer of inner heat exchange tube is arranged inside, and at least two layers of outer heat exchange tubes are arranged outside;
[0056] 2. The inner heat exchange tubes and the outer heat exchange tubes of the present utility model are isolated by an inner shell. There is no inner shell isolation between the inner heat exchange tubes and the outer heat exchange tubes at the position opposite to the combustion unit, realizing a 2-pass channel. The inner circle serves as the combustion space and the high-temperature channel, and the outer circle serves as the low-temperature channel. The heat exchange is carried out through the gap between the heat exchange tubes in the inner and outer circles, improving the heat exchange efficiency, greatly reducing the volume of the device, and reducing the tube-side capacity and the dye liquor capacity.
[0057] 3. The heat exchange tubes are straight tubes. Compared with the coiled heat exchange tube structure used in traditional steam generators, they are easier to clean and can better remove the dye liquor scale in the tubes.
[0058] II. Design of the self-cleaning heat exchanger for dyed fabric fibers
[0059] 1. The water inlet is located at the lower half of the left blind cover of the heat exchange unit and has a certain inclination. If the water inlet stops, the remaining water can be used to backflush the inlet of the tube sheet of the heat exchange tubes to prevent the fabric fibers from bridging and blocking the heat exchange tubes.
[0060] III. Others
[0061] 1. The water outlet is located at the top of the heat exchange unit and is arranged vertically upward, which is beneficial to the air evacuation at the top of the heat exchange unit, avoiding the decrease in heat exchange efficiency caused by the unevacuated air and the high-temperature deformation and damage of the heat exchange tubes due to the lack of heat exchange water cooling.
[0062] 2. An elliptical cover is added to the inlet tube sheet, which can reduce the dye liquor volume inside the heat exchange unit (which is the utility model point of another utility model).
[0063] The preferred embodiments of the present utility model are given in the accompanying drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present utility model more thorough and comprehensive.
Claims
1. A gas heating device for a printing and dyeing vat, comprising a heat exchange unit (1) and a combustion unit (2); characterized in that: The heat exchange unit is provided with a first channel and a second channel arranged inside and outside, and a plurality of heat exchange tubes passing through the first channel and the second channel at the same time. One side of the heat exchange unit is provided with a water inlet (1-1), and the other side of the heat exchange unit is provided with a water outlet (1-2), a smoke inlet (1-3) and a smoke outlet (1-4); the smoke inlet, the first channel, the second channel and the smoke outlet are connected in sequence, and the smoke flow directions in the first channel and the second channel are opposite; the combustion unit is connected to the smoke inlet; the water inlet, the heat exchange tubes and the water outlet are connected in sequence.
2. The gas heating device for a printing and dyeing vat according to claim 1, wherein: The heat exchange unit includes a heat exchanger and a head assembly; the heat exchanger includes a housing (1.1), tube sheets (1.2) fixed at both ends of the housing, and heat exchange tubes located in the housing and connecting the tube sheets at both ends; the heat exchange tubes include inner heat exchange tubes (1.3) and outer heat exchange tubes (1.4), the inner heat exchange tubes are arranged in the first flue, and the outer heat exchange tubes are arranged in the second flue.
3. The gas heating device for a printing and dyeing vat according to claim 2, characterized in that: An inner housing (1.5) is provided in the housing, the inner housing surrounds the inner heat exchange tubes and the right end of the inner housing is connected to the water outlet side tube sheet; the inside of the inner housing serves as the first channel, and the space between the inner housing and the housing serves as the second channel.
4. The gas heating device for a printing and dyeing vat according to claim 3, wherein: The head assembly includes a left blind cover (11) provided at the left end of the heat exchanger, a ring pipe (12) provided on the right side of the heat exchanger, a right blind cover (13) provided at the right end of the heat exchanger, and an inner pipe (14); the left blind cover communicates with the heat exchange tubes and is provided with the water inlet; the ring pipe communicates with the second flue and is provided with the smoke outlet; the inner pipe passes through the right blind cover and communicates with the first flue, and the inner pipe serves as the smoke inlet; the right blind cover communicates with the heat exchange tubes and is provided with the water outlet.
5. The gas heating device for a printing and dyeing vat according to claim 4, wherein: There is a layer of inner heat exchange tubes arranged around the central axis and closely attached to the inner wall of the inner housing in the first channel; there are at least two layers of outer heat exchange tubes arranged around the central axis in the second channel.
6. The gas heating device for a printing and dyeing vat according to claim 5, wherein: In the second channel, the outermost outer heat exchange tube is closely attached to the inner wall of the housing, and the innermost outer heat exchange tube is closely attached to the outer wall of the inner housing.
7. A gas heating device for a printing and dyeing vat according to claim 6, characterized in that: The inner heat exchange tubes are fixed to the inner housing through positioning plates (1.6); the outer heat exchange tubes are fixed to the inner wall of the housing and the outer wall of the inner housing through outer baffle plates (1.7) and inner baffle plates (1.8) respectively; the outer baffle plates and the inner baffle plates are arranged in sequence along the smoke flow direction.
8. A gas heating device for a printing and dyeing vat according to claim 7, characterized in that: The water inlet is arranged obliquely downward; the water outlet is arranged vertically upward; the smoke outlet is arranged vertically upward.
9. The gas heating device for a printing and dyeing vat according to claim 8, characterized in that: The combustion unit includes a combustion tube (2.1) communicating with the smoke inlet, a burner assembly (2.2), and a valve group (2.3).