A high-efficiency heat exchanger for dust-containing gases

Abstract

The utility model relates to the technical field of heat exchangers, and specifically to a high-efficiency heat exchanger for dust-containing gas, comprising a heat exchanger shell and heat exchange tubes, a fixed connecting rod is installed on the inner side of the heat exchanger shell, and heat exchange tubes are evenly mounted inside the fixed connecting rods, the upper and lower proportions of the heat exchange tubes are distributed in unequal diameters, and multiple groups of heat exchange tubes are provided with aluminum alloy fins, the bottom of the heat exchanger shell is provided with a dust-containing gas inlet cavity, and the outer side of the dust-containing gas inlet cavity is connected to a dust-containing gas inlet port; in the utility model, by changing the feed form, tube array form and dust discharge pipe port settings of the heat exchanger, the influence of dust in the gas on the heat exchange effect of the heat exchanger is reduced, the heat exchange mode of the heat exchanger is improved to achieve the purpose of efficient operation, the dust cleaning method is simplified, thereby improving the high efficiency and stability of the operation of the heat exchanger, the operation process is simple, and the equipment reliability and stability are high.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a high-efficiency heat exchanger for dust-containing gas. Background Art

[0002] Heat exchangers are important equipment for energy transfer in industrial production processes. The core indicator for measuring the operating effect of heat exchangers is the heat exchange effect, so improving the heat exchange effect is crucial for heat exchangers. In industrial production, it is often necessary to exchange heat for dust-containing gases, such as pulverized coal gas. Existing heat exchangers usually use shells and tubes. The equipment uses the pressure of the heat source as the power, and runs through the tube side and shell side respectively. The tube side is a tube with the same diameter. The heat source transfers heat through the metal surface of the tube to achieve the purpose of heat exchange.

[0003] The existing dust-containing gas heat exchanger has the following technical problems during operation:

[0004] 1. The dust in the gas will slowly adhere to the tubes or shells of the heat exchanger. The attached solid particles or dust will reduce the heat transfer coefficient and affect the heat exchange effect during the heat exchange process. When the attached solid particles or dust accumulate to a certain extent, it will cause the tubes to be blocked, reduce the material flow performance, reduce the heat exchange area, and greatly affect the heat transfer;

[0005] 2. High-velocity material flushing equipment causes the wall thickness of the equipment to decrease, creating unstable factors that affect safe production;

[0006] 3. The cleaning process of the heat exchanger is relatively troublesome, especially when the materials are flammable, explosive, toxic or high value-added materials. Disassembly and cleaning will cause system shutdown, environmental pollution and material waste;

[0007] Therefore, in view of this, the existing structure and deficiencies are studied and improved, and an efficient heat exchanger for dust-containing gas is proposed, in order to achieve a more practical purpose. Utility Model Content

[0008] The purpose of the utility model is to provide a high-efficiency heat exchanger for dust-containing gas to solve the problems raised in the above background technology.

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a heat exchange tube (10) is installed on the inner side of the heat exchanger shell (1), the upper and lower proportions of the heat exchange tube (10) are distributed in unequal diameters, the tube mouth is fixed on the tube plate, and the tube is connected to a fixed connecting rod (14), and aluminum alloy fins (15) are arranged between the heat exchange tubes (10), a dust-containing gas inlet cavity (101) is arranged at the bottom of the heat exchanger shell (1), and the outer side of the dust-containing gas inlet cavity (101) is connected to a dust-containing gas inlet port (6), and a dust-containing gas outlet port (5) is arranged at the top of the heat exchanger shell (1), and the heat exchanger shell (1) is provided with a dust-containing gas outlet port (5). An anti-collision distributor (12) is provided on the inner side of the top, and the anti-collision distributor (12) cooperates with the upper and lower positions of the heat exchange tube (10) at the lower end; a flange fixing assembly (3) is provided at the bottom of the dust-containing gas inlet chamber (101), and the bottom of the flange fixing assembly (3) is connected to an ash collecting head (2); the upper end of the side wall of the heat exchanger shell (1) is connected to a heat source inlet (8), and the lower end of the side wall of the heat exchanger shell (1) is connected to a heat source outlet (9); backwashing air inlets (7) are installed around the top wall of the heat exchanger shell (1); and the dust-containing gas inlet chamber (101) and the heat exchange tube (10) are connected to each other.

[0010] Furthermore, the bottom of the side wall of the heat exchanger shell is connected to a side end sewage outlet, and the bottom of the ash collecting head is connected to a bottom sewage outlet.

[0011] Furthermore, an air intake nozzle is extended and installed on the inner side of the dust-containing gas inlet.

[0012] Furthermore, the air outlet nozzle of the air inlet nozzle is arranged in a trumpet shape toward the bottom.

[0013] Furthermore, an anti-collision baffle is provided on the inner side of the heat source inlet.

[0014] Furthermore, a nameplate seat is provided on one side of the upper end of the side wall of the heat exchanger shell, and fixing ear seats are provided on both sides of the middle part of the side wall of the heat exchanger shell.

[0015] Furthermore, the backwash air inlets are evenly distributed along the central axis of the top end of the heat exchanger shell, and four groups of backwash air inlets are provided.

[0016] The utility model provides a high-efficiency heat exchanger for dust-containing gas, which has the following beneficial effects: by changing the feed form, tube form and dust discharge pipe port settings of the heat exchanger, the influence of dust in the gas on the heat exchange effect of the heat exchanger is reduced, the heat exchange mode of the heat exchanger is improved to achieve the purpose of high-efficiency operation, and the dust cleaning method is simplified, thereby improving the high-efficiency and stability of the operation of the heat exchanger, the operation process is simple, and the equipment reliability and stability are high;

[0017] 1. The utility model provides the function of cleaning without dismantling the equipment by setting the dust collecting head and backwashing gas, thus reducing the downtime maintenance cost and ensuring the safety and stability of the system;

[0018] 2. The utility model has an anti-collision distributor on the upper part and an air inlet nozzle on the lower part to reduce the gas flow rate, reduce the scouring and thinning of the equipment caused by the airflow, and extend the service life of the equipment;

[0019] 3. The utility model uses unequal diameter tubes to replace equal diameter tubes, and uses the heat pump principle to reduce dust accumulation in the tubes, thereby ensuring the heat exchange area and heat exchange coefficient and improving the heat exchange effect;

[0020] 4. The utility model ingeniously uses aluminum alloy warping pieces with high heat transfer coefficient to connect the tubes, thereby increasing the heat transfer coefficient, increasing the heat source residence time, and increasing the stability of the tubes, thereby improving the heat transfer effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only used to illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention. In the drawings:

[0022] Figure 1 This is a schematic diagram of the internal cross-sectional structure of a high-efficiency heat exchanger for dust-containing gas according to the utility model;

[0023] Figure 2 This is a schematic diagram of the distribution structure of the heat exchange tubes and aluminum alloy fins of a high-efficiency heat exchanger for dust-containing gas in a top view according to the utility model;

[0024] Figure 3 It is a schematic diagram of a partially enlarged structure of a dust-containing gas inlet cavity of a high-efficiency heat exchanger for dust-containing gas according to the utility model.

[0025] In the figure: 1. heat exchanger shell; 101. dust-containing gas inlet chamber; 2. ash collecting head; 3. flange fixing assembly; 4. bottom drain port; 5. dust-containing gas outlet; 6. dust-containing gas inlet; 601. air inlet nozzle; 7. backwash inlet; 8. heat source inlet; 9. heat source outlet; 10. heat exchange tube; 11. anti-impact baffle; 12. anti-impact distributor; 13. side drain port; 14. fixed connecting rod; 15. aluminum alloy fin; 16. nameplate seat; 17. fixed ear seat. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1-3 The utility model provides a technical solution: a high-efficiency heat exchanger for dust-containing gas, comprising a heat exchanger shell 1 and a heat exchange tube 10, a fixed connecting rod 14 is installed on the inner side of the heat exchanger shell 1, and the heat exchange tube 10 is evenly mounted inside the fixed connecting rod 14, the heat exchange tube 10 is distributed in unequal diameters in the upper and lower proportions, and aluminum alloy fins 15 are arranged at the inner connection of multiple groups of heat exchange tubes 10, a dust-containing gas inlet cavity 101 is arranged at the bottom of the heat exchanger shell 1, and the outer side of the dust-containing gas inlet cavity 101 is connected with a dust-containing gas inlet port 6, a dust-containing gas outlet port 5 is arranged at the top of the heat exchanger shell 1, an anti-collision distributor 12 is arranged on the inner side of the top of the heat exchanger shell 1, and the anti-collision distributor 12 cooperates with the upper and lower positions of the multiple groups of heat exchange tubes 10 at the lower end, a flange fixing component 3 is arranged at the bottom of the dust-containing gas inlet cavity 101, and the bottom of the flange fixing component 3 is connected to the A dust collecting head 2 is connected, the upper end of the side wall of the heat exchanger shell 1 is connected to a heat source inlet 8, and the lower end of the side wall of the heat exchanger shell 1 is connected to a heat source outlet 9, backwashing air inlets 7 are installed around the top wall of the heat exchanger shell 1, and the dust-containing gas inlet cavity 101 and multiple groups of heat exchange tubes 10 are connected to each other; the bottom of the side wall of the heat exchanger shell 1 is connected to a side end sewage outlet 13, and the bottom of the ash collecting head 2 is connected to a bottom sewage outlet 4; an air inlet nozzle 601 is installed on the inner side of the dust-containing gas inlet 6; the air outlet of the air inlet nozzle 601 is evenly arranged toward the bottom; an anti-collision baffle 11 is arranged on the inner side of the heat source inlet 8; a nameplate seat 16 is arranged on one side of the upper end of the side wall of the heat exchanger shell 1, and fixed ear seats 17 are arranged on both sides of the middle part of the side wall of the heat exchanger shell 1; the backwashing air inlet 7 is evenly distributed along the central axis of the top of the heat exchanger shell 1, and four groups of backwashing air inlets 7 are arranged;

[0028] By setting the dust collecting head 2 at the bottom and combining the backwashing gas form formed by setting multiple groups of backwashing air inlets 7 at the top, the dust can be washed to the bottom by delivering the cleaning gas from the top during cleaning, providing the function of cleaning without dismantling the equipment, reducing the downtime maintenance cost and ensuring the safety and stability of the system;

[0029] An anti-collision distributor 12 is provided at the upper part, and an air inlet nozzle 601 is provided at the lower part to reduce the gas flow rate. The anti-collision distributor 12 is combined with the upper and lower ends of the air inlet nozzle 601 to reduce the scouring and thinning of the equipment caused by the airflow, thereby extending the service life of the equipment.

[0030] Using unequal diameter heat exchange tubes 10 to replace equal diameter tubes, using the heat pump principle to remove dust in the tubes through negative pressure and flow rate, reducing dust accumulation in the heat exchange tubes 10, thereby ensuring the heat exchange area and heat exchange coefficient, and improving the heat exchange effect;

[0031] The heat transfer tubes 10 are connected by ingeniously using the aluminum alloy fins 15 with high heat transfer coefficient, so as to improve the heat transfer coefficient, increase the heat source residence time, increase the stability of the tubes, and improve the heat transfer effect. Here, the aluminum alloy fins 15 with high heat transfer coefficient are used to connect the tubes as the heat transfer medium. Other materials or connection forms can also meet this requirement.

[0032] Working principle: For this type of high-efficiency heat exchanger for dust-containing gas, the material is first transported through the tube side and the heat source is transported through the shell side, so that the dust-containing gas is transported from the dust-containing gas inlet 6 to be evenly sprayed out through the inlet nozzles 601 arranged on the inside. The inlet flow rate is reduced by the inlet nozzles 601 to increase the accumulation of dust in the ash collecting head 2. Then, the dust-containing gas is made to rise from the inside of the heat exchange tubes 10 through the unequal diameter heat exchange tubes 10. The heat pump operation principle of increasing the flow rate as the tube diameter decreases is used to reduce the probability of dust accumulation in the heat exchange tube 10. After that, after the dust-containing gas is sprayed out from the top diameter port of the heat exchange tube 10, it will pre-contact the anti-impact distributor 12 on the top to guide the dust-containing gas to avoid the airflow from hitting the upper end seal of the heat exchanger shell 1 The dust-containing gas is flushed at the head, and the dust-containing gas is discharged from the dust-containing gas outlet 5 after being buffered by the anti-impact distributor 12. At the same time, the heat source is input from the heat source inlet 8, and then fills the inside of the heat exchanger shell 1. The baffle plate on the inside of the heat exchanger shell 1 and the aluminum alloy fins 15 at the connection between the heat exchange tube 10 and the heat exchange tube 10 are used to receive heat and transfer the heat absorbed by themselves to the dust-containing gas, thereby achieving the heat transfer function. When the heat exchanger needs to be backwashed regularly, nitrogen enters from the multiple groups of backwashing air inlets 7 at the top, and the pulse flushing gas is used to evenly pass the flushing gas to each heat exchange tube 10, reversely flush the dust accumulated in the heat exchange tube 10, flush the accumulated dust into the ash collecting head 2, and then discharge the dust through the bottom sewage outlet 4.

[0033] The above description is only a specific implementation method of the utility model, but the protection scope of the utility model is not limited to this. Any changes or substitutions that can be thought of by any technician familiar with the field within the technical scope disclosed by the utility model without creative work should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope defined in the claims.

Claims

1. A high-efficiency heat exchanger for dust-containing gas, comprising a heat exchanger shell (1) and a heat exchange tube (10), characterized in that: A heat exchange tube (10) is installed on the inner side of the heat exchanger shell (1), the heat exchange tube (10) is distributed in unequal diameters in upper and lower proportions, the tube mouth is fixed on the tube plate, and the tube is connected to a fixed connecting rod (14), and aluminum alloy fins (15) are arranged between the heat exchange tubes (10), a dust-containing gas inlet cavity (101) is arranged at the bottom of the heat exchanger shell (1), and the outer side of the dust-containing gas inlet cavity (101) is connected to a dust-containing gas inlet port (6), a dust-containing gas outlet port (5) is arranged at the top of the heat exchanger shell (1), and an anti-collision distribution device is arranged on the inner side of the top of the heat exchanger shell (1). The heat exchanger (10) is provided with a heat source inlet (8) and a heat source outlet (9) is connected to the flange fixing assembly (3) at the bottom of the dust-containing gas inlet chamber (101). The anti-collision distributor (12) cooperates with the heat exchange tube (10) at the lower end in the upper and lower positions. The dust-containing gas inlet chamber (101) is provided with a flange fixing assembly (3) at the bottom of the flange fixing assembly (3). The ash collecting head (2) is connected to the upper end of the side wall of the heat exchanger shell (1). The heat source inlet (8) is connected to the upper end of the side wall of the heat exchanger shell (1). The heat source outlet (9) is connected to the lower end of the side wall of the heat exchanger shell (1). Backwash inlets (7) are installed around the top wall of the heat exchanger shell (1). The dust-containing gas inlet chamber (101) and the heat exchange tube (10) are connected to each other.

2. A high-efficiency heat exchanger for dust-containing gas according to claim 1, characterized in that: The bottom of the side wall of the heat exchanger shell (1) is connected to a side end sewage outlet (13), and the bottom of the ash collecting head (2) is connected to a bottom sewage outlet (4).

3. The high-efficiency heat exchanger for dust-containing gas according to claim 1, characterized in that: An air inlet nozzle (601) is installed extending inside the dust-containing gas inlet (6).

4. The high-efficiency heat exchanger for dust-containing gas according to claim 3, characterized in that: The air inlet nozzle (601) and the air outlet nozzle are evenly arranged toward the bottom.

5. The high-efficiency heat exchanger for dust-containing gas according to claim 1, characterized in that: An impact baffle (11) is provided on the inner side of the heat source inlet (8).

6. The high-efficiency heat exchanger for dust-containing gas according to claim 1, characterized in that: A nameplate seat (16) is provided on one side of the upper end of the side wall of the heat exchanger shell (1), and fixing ear seats (17) are provided on both sides of the middle part of the side wall of the heat exchanger shell (1).

7. The high-efficiency heat exchanger for dust-containing gas according to claim 1, characterized in that: The backwash air inlets (7) are evenly distributed along the central axis of the top end of the heat exchanger shell (1), and four groups of backwash air inlets (7) are provided.

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