Fuel gas heating device for small-capacity printing and dyeing dye vat
Through the design of the internal and external heat exchange pipe structure of the gas heating device of the small-capacity printing dyed dyed tank, the environmental pollution and high energy consumption of the existing dyed tank heating device are solved, and efficient and safe dyed tank heating effect is achieved.
Patent Information
- Application Number
- CN202422065699.1
- 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 environmental pollution, high energy consumption, serious heat loss and safety hazards. In particular, the large shell volume of traditional natural gas heating devices leads to increased energy consumption and insufficient safety.
A small-capacity printing dyeing and dyeing cylinder gas heating device is adopted, and a heat exchange pipe structure arranged inside and outside is adopted. The high-temperature flue gas is in the shell process and the dyeing liquid is heat exchanged through the inner and outer heat exchange pipes. It is designed as an integrated combustion space and heat exchange unit. Two flue gas channels are formed between the inner and outer heat exchange pipes to improve heat transfer efficiency and reduce the dyeing liquid capacity.
It realizes low-energy consumption and high-safety dye tank heating, with small dye liquid capacity and low heat reserves, avoiding the increase in energy consumption during multiple heating and cooling processes, and has the characteristics of small size, high safety, energy-saving and environmentally friendly.
Smart Images
Figure CN223150839U_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 small-capacity printing and dyeing vat. Background Technique
[0002] For enterprises engaged in dyeing production, the heating devices of 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 great 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. At the same time, the heating equipment for the heat-conducting medium requires additional space and operating management personnel, resulting in great 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 air 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 liquor 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 liquor during multiple heating and cooling processes, and the large heat storage will also cause adverse factors such as potential safety hazards. Content of the Utility Model
[0005] The purpose of the utility model is to overcome the deficiencies in the above background technique and provide a gas heating device for a small-capacity 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 small-capacity printing and dyeing vat includes a heat exchange unit and a combustion unit; it is 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 of the heat exchange unit is provided with a water outlet, a flue gas inlet, and a smoke exhaust outlet; the flue gas inlet, the first channel, the second channel, and the smoke exhaust outlet are connected in sequence, and the flue gas flow directions in the first channel and the second channel are opposite; the combustion unit is connected to the flue gas inlet; the water inlet, the heat exchange tubes, and the water outlet are connected in sequence;
[0008] The heat exchange unit includes a heat exchanger and a head component; the heat exchanger includes a shell, tube sheets fixed at both ends of the shell, and heat exchange tubes located in the shell 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] The tube sheets include a water inlet side tube sheet and a water outlet side tube sheet; a protruding part is provided in the middle of the water inlet side tube sheet; three layers of outer heat exchange tubes arranged around the central axis are provided in the second channel.
[0010] An inner shell is provided in the shell, the inner shell surrounds the inner heat exchange tubes and the right end of the inner shell is connected to the water outlet side tube sheet; the inside of the inner shell serves as the first channel, and the space between the inner shell and the shell serves as the second channel; one layer of inner heat exchange tubes arranged around the central axis and closely attached to the inner wall of the inner shell is provided in the first channel.
[0011] The head component 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 exhaust port; 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; the protruding part of the water inlet side tube sheet extends into the left blind cover.
[0012] In the second channel, the outermost layer of outer heat exchange tubes is closely attached to the inner wall of the shell, and the innermost layer of outer heat exchange tubes is closely attached to the outer wall of the inner shell.
[0013] The inner heat exchange tubes are fixed to the inner shell through positioning plates; the outer heat exchange tubes are fixed to the inner wall of the shell and the outer wall of the inner shell 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 exhaust port 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:
[0017] The small-capacity dyeing vat gas heating device provided by the present invention 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 capacity is small (generally less than 30 liters), the dye liquor capacity is small, 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 1 is one of the three-dimensional structure diagrams of the present utility model.
[0019] Figure 2 is the second three-dimensional structure diagram of the present utility model.
[0020] Figure 3 is the front view structure diagram of the present utility model.
[0021] Figure 4 is the sectional structure diagram of the present utility model.
[0022] Figure 5 is the front view structure diagram of the heat exchange unit of the present utility model.
[0023] Figure 6 is the sectional structure diagram of the heat exchange unit of the present utility model.
[0024] Figure 7 is the three-dimensional structure diagram of the heat exchanger of the present utility model.
[0025] Figure 8 is the right view structure diagram of the heat exchanger of the present utility model.
[0026] Figure 9 is the left view structure diagram of the heat exchanger of the present utility model.
[0027] Figure 10 is the schematic diagram of the flow direction of the flue gas of the present utility model.
[0028] Figure 11 is the schematic diagram of the flow direction of the dyeing solution of the present utility model.
[0029] Reference numerals:
[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, protruding portion 1.2.11, 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, third outer heat exchange tube 1.4.3, inner shell 1.5, positioning plate 1.6, outer baffle 1.7, inner baffle 1.8, left end cover 11, annular tube 12, right end 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 implementation manners
[0031] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0032] As Figure 1 shown, a gas heating device for a small-capacity dyeing vat includes a heat exchange unit 1 and a combustion unit 2.
[0033] As Figure 3 shown, 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 (high-temperature flue gas) generated by the combustion is sent into the heat exchange unit. The circulating water (dye solution) of the dye 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 dye vat rises and the temperature of the flue gas drops.
[0034] As Figure 4 shown, a water inlet 1-1 is arranged on the left side of the heat exchange unit, and a water outlet 1-2, a smoke inlet 1-3 and a smoke 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 Figure 4 shown, the heat exchanger includes a housing 1.1, a tube sheet 1.2, heat exchange tubes, and an inner housing 1.5. The left and right ends of the housing are fixed with tube sheets, including a water inlet side tube sheet 1.2.1 arranged at the left end of the housing and a water outlet side tube sheet 1.2.2 arranged at the right end of the housing. The heat exchange tubes are arranged inside the housing, 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 housing is arranged inside the housing, the inner housing surrounds the inner heat exchange tubes, the inner housing is connected to the water outlet side tube sheet on the right side, and the inner housing keeps a certain distance from the water inlet side tube sheet on the left side, so that the inner and outer regions of the inner housing are connected. A convex portion 1.2.11 with an arc-shaped surface is arranged in the middle of the water inlet side tube sheet, and the convex portion protrudes to the left ( Figure 4 to the left).
[0036] As Figure 10 shown, the inside of the inner housing serves as a first channel A, and the space between the inner housing and the housing serves as a second channel B. The left end of the first channel communicates with 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 Figure 8 and Figure 9As shown, the inner heat exchange tube and the outer heat exchange tube are arranged concentrically inside and outside. The inner heat exchange tube is 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 tube and the inner shell form a water-cooled wall structure, and the inner heat exchange tube is fixed to the inner wall of the inner shell through a number of positioning plates 1.6.
[0038] The outer heat exchange tube is arranged in the second flue. There are three layers of outer heat exchange tubes arranged around the central axis in the second channel. Among them, the outermost layer of outer heat exchange tubes (the first outer heat exchange tube 1.4.1) is closely attached to the inner wall of the outer shell. These outer heat exchange tubes are fixed to the inner wall of the outer shell through outer baffle plates 1.7. The innermost layer of outer heat exchange tubes (the third outer heat exchange tube 1.4.3) is closely attached to the outer wall of the inner shell. These outer heat exchange tubes are fixed to the outer wall of the inner shell through inner baffle plates 1.8. The middle layer of outer heat exchange tubes (the second outer heat exchange tube 1.4.2) is located between the outermost layer of outer heat exchange tubes and the innermost layer of outer heat exchange tubes. These outer heat exchange tubes are fixed to both the outer baffle plates and the inner baffle plates at the same time.
[0039] The outer baffle plates and the inner baffle plates are arranged in sequence along the flue gas flow direction ( Figure 10 the horizontal right direction in the figure). As Figure 9 shown, the number of inner heat exchange tubes is 30. The number of the outermost layer of outer heat exchange tubes (the first outer heat exchange tube 1.4.1) is 58. The number of the middle layer of outer heat exchange tubes (the second outer heat exchange tube 1.4.2) is 40. The number of the innermost layer of outer heat exchange tubes (the third outer heat exchange tube 1.4.3) is 26.
[0040] Since the outer baffle plates and the inner baffle plates are both fixed to the outer heat exchange tubes, the outer baffle plates are fixed to the outer shell, the inner baffle plates are fixed to the inner shell, the outer heat exchange tubes are in close contact with the outer shell and the inner shell respectively, and the positioning plates are fixed to the inner 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, a ring 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 inlet side tube sheet. The inside of the left blind cover is connected to 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. The protruding part of the inlet side tube sheet extends into the left blind cover, so the volume between the left blind cover and the inlet side tube sheet is reduced, and the tube side capacity is reduced.
[0043] The ring 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 ring pipe is connected to the second flue through the annular opening. The smoke exhaust port is provided at the top of the ring pipe, and the smoke exhaust port is arranged vertically upward.
[0044] The inner tube and the right blind cover are located at the right end of the heat exchanger. The inner tube axially passes through the right blind cover. The left end of the inner tube 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 tube is connected to the first flue through the inlet, and the right end of the inner tube serves as the flue gas inlet.
[0045] The right blind cover surrounds the inner tube 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 connected to 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 flue gas inlet, the first channel, the second channel and the smoke outlet are connected in sequence, and the flue gas flow directions in the first channel and the second channel are opposite. As Figure 10 shown, the air flow direction in the first channel is horizontally to the left, and the air flow direction in the second channel is horizontally to the right. The water inlet, the heat exchange tubes and the water outlet are connected in sequence. As Figure 11 shown, the water flow directions in the inner heat exchange tubes and the outer heat exchange tubes are 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, and the air inlet is arranged vertically downward. The left end of the combustion tube is connected to the flue gas inlet of the inner tube. The burner assembly is arranged inside the combustion tube. The valve group extends into the combustion tube and is also connected to the burner assembly. An igniter is also provided in the combustion tube.
[0048] The working principle of the present utility model is:
[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. The generated high-temperature flue gas sequentially passes through the flue gas 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 tubes 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 tubes and the outer heat exchange tubes. 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 operating condition of the first channel is 800 - 1300 °C; the water-cooled wall structure composed of the inner heat exchange tubes 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 operating condition of the second channel is 100 - 600 °C; the external heat exchange tubes exchange heat with the low-temperature flue gas again to further utilize the waste heat of the flue gas. The external baffle and the internal 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 features of the present utility model are as follows:
[0054] I. Integrated structure of the combustion space and the heat exchange unit
[0055] 1. Different from the heat exchange tubes arranged in a triangular pattern in traditional heat exchangers, the heat exchange tubes of the present utility model adopt a concentric circle arrangement method. The heat exchange tubes are arranged in layers. One layer of internal heat exchange tubes is arranged inside, and at least two layers of external heat exchange tubes are arranged outside.
[0056] 2. The internal heat exchange tubes and the external heat exchange tubes of the present utility model are isolated by an inner shell. There is no inner shell isolation between the internal heat exchange tubes and the external heat exchange tubes at the opposite end of 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 pass capacity and the dye solution capacity.
[0057] 3. The heat exchange tubes adopt straight tubes. Compared with the coiled tube heat exchange tube structure used in traditional steam generators, they are easier to clean and can better remove the dye solution scale inside the tubes.
[0058] II. Design of the self-cleaning heat exchanger for dyed fabric fibers
[0059] 1. The water inlet is located in 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 for backwashing the tube sheet inlet 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 conducive 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 oval cover is added to the inlet tube sheet, which can reduce the dye solution volume inside the heat exchange unit (which is the invention point of another utility model).
[0063] The preferred embodiments of the present utility model are shown in the 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 small-capacity 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 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 (1-1), and the other side of the heat exchange unit is provided with a water outlet (1-2), a flue gas inlet (1-3) and a flue gas outlet (1-4); the flue gas inlet, the first channel, the second channel and the flue gas outlet are connected in sequence, and the flue gas flow directions in the first channel and the second channel are opposite; the combustion unit is connected to the flue gas inlet; the water inlet, the heat exchange tubes and the water outlet are connected in sequence; The heat exchange unit includes a heat exchanger and a head assembly; the heat exchanger includes a shell (1.1), tube sheets (1.2) fixed at both ends of the shell, and heat exchange tubes located in the shell 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; The tube sheet includes a water inlet side tube sheet and a water outlet side tube sheet; a protruding part (1.2.11) is provided in the middle of the water inlet side tube sheet; three layers of outer heat exchange tubes arranged around the central axis are provided in the second channel.
2. The gas heating device for a small-capacity printing and dyeing vat according to claim 1, wherein: An inner shell (1.5) is provided in the shell, the inner shell surrounds the inner heat exchange tubes and the right end of the inner shell is connected to the water outlet side tube sheet; the inside of the inner shell serves as the first channel, and the space between the inner shell and the shell serves as the second channel; one layer of inner heat exchange tubes arranged around the central axis and closely attached to the inner wall of the inner shell is provided in the first channel.
3. A gas heating device for a small-capacity printing and dyeing vat according to claim 2, characterized in that: 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 flue gas outlet; the inner pipe passes through the right blind cover and communicates with the first flue, and the inner pipe serves as the flue gas inlet; the right blind cover communicates with the heat exchange tubes and is provided with the water outlet; the protruding part of the water inlet side tube sheet extends into the left blind cover.
4. A small-capacity dyeing vat gas heating device according to claim 3, characterized in that: In the second channel, the outermost layer of outer heat exchange tubes is closely attached to the inner wall of the shell, and the innermost layer of outer heat exchange tubes is closely attached to the outer wall of the inner shell.
5. The gas heating device for a small-capacity printing and dyeing vat according to claim 4, characterized in that: The inner heat exchange tubes are fixed to the inner shell through positioning plates (1.6); the outer heat exchange tubes are fixed to the inner wall of the shell and the outer wall of the inner shell 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 flue gas flow direction.
6. The gas heating device for a small-capacity printing and dyeing vat according to claim 5, wherein: The water inlet is arranged obliquely downward; the water outlet is arranged vertically upward; the flue gas outlet is arranged vertically upward.
7. A gas heating device for a small-capacity printing and dyeing vat according to claim 6, characterized in that: The combustion unit includes a combustion tube (2.1) communicating with the flue gas inlet, a burner assembly (2.2), and a valve group (2.3).