Shell-and-tube heat exchanger for hot flue gas and solid upgraded coal particles

Abstract

The utility model discloses a shell-and-tube heat exchanger for hot flue gas and solid upgraded coal particles, which belongs to the field of pyrolysis and purification of high-temperature raw gas and comprises a heat exchange cylinder. The heat exchanger is characterized in that a preset number of heat exchange pipes are arranged in the heat exchange cylinder in parallel in the axis direction; the outer side of the upper cylinder body is sleeved with a gas outlet jacket, and the outer side of the lower cylinder body is sleeved with a gas inlet jacket; the secondary heat exchange device has the advantages that the straight pipe type heat exchange pipe is matched with the spiral hot smoke channel, so that the purpose of secondary heat exchange is achieved, the heat exchange efficiency is guaranteed, and meanwhile the problem that solid upgraded coal particles are broken by the spiral heat exchange pipe is avoided.

Description

Technical field:

[0001] The utility model belongs to the field of high-temperature raw coal gas pyrolysis and purification, and more specifically relates to a shell and tube heat exchanger for hot flue gas and solid quality-improving coal particles. Background technology:

[0002] In the existing low-grade pulverized coal low-temperature pyrolysis and purification field, the particle bed dust removal process is the most stable and reliable process device among the high-temperature oil and gas dust removal processes that have been put into large-scale production. The patent with publication number CN219308240U discloses a high-temperature oil and gas moving bed dust removal process device, in which the filter uses high-temperature hot flue gas to directly contact the upgraded coal particles for heating as filter material. Most of the heated exhaust flue gas enters the subsequent process with the purified high-temperature oil and gas, resulting in a certain degree of increase in the content of carbon dioxide, nitrogen, and water vapor in the raw coal gas, affecting the economic benefits of the subsequent process production.

[0003] At present, there are also shell and tube heat exchangers. In order to improve the heat exchange efficiency, spiral heat exchange tubes are mostly used, which can easily cause high-speed coal particles to collide and crush, and also increase a certain amount of wind resistance. The use of linear heat exchange tubes can solve the above problems, but the heat exchange efficiency is poor. Utility model content:

[0004] In order to solve the above problems and overcome the shortcomings of the prior art, the utility model provides a shell and tube heat exchanger for hot flue gas and solid upgraded coal particles;

[0005] The first technical problem to be solved is: in order to improve the heat exchange efficiency, the shell and tube heat exchanger used for hot flue gas and solid upgraded coal particles often adopts spiral heat exchange tubes, which easily leads to the collision and crushing of high-speed coal particles and also increases a certain amount of wind resistance. The use of linear heat exchange tubes can reduce collisions, but the heat exchange efficiency is poor.

[0006] The specific technical solution of the utility model to solve the above technical problems is: the shell and tube heat exchanger for hot flue gas and solid upgraded coal particles comprises a heat exchange cylinder; an upgraded coal particle inlet is provided at the upper end of the heat exchange cylinder, and an upgraded coal particle outlet is provided at the lower end of the heat exchange cylinder, characterized in that a preset number of heat exchange tubes are arranged in parallel in the axial direction of the heat exchange cylinder;

[0007] The heat exchange cylinder is divided into an upper cylinder and a lower cylinder; the outer side of the upper cylinder is provided with an air outlet jacket, and the outer side of the lower cylinder is provided with an air inlet jacket; a spiral hot flue gas channel is arranged in the air inlet jacket, and a hot flue gas inlet is opened at the upper end of the air inlet jacket, and the hot flue gas inlet is connected with one end of the spiral hot flue gas channel; one end of the heat exchange tube passes through the outer wall of the lower cylinder and is connected with the other end of the spiral hot flue gas channel, and the other end of the heat exchange tube passes through the outer wall of the upper cylinder and is connected with the air outlet jacket.

[0008] Furthermore, the gas outlet jacket is provided with a hot flue gas outlet.

[0009] Furthermore, the heat exchange cylinder is divided into an upper cylinder and a lower cylinder, and the upper cylinder and the lower cylinder are connected through an expansion joint.

[0010] Furthermore, the spiral hot flue gas channel is enclosed by a swirl plate spirally arranged in the air intake jacket.

[0011] Furthermore, the swirl plate, the air inlet jacket and the lower cylinder wall enclose a spiral hot flue gas channel.

[0012] Furthermore, the lower end of the heat exchange cylinder located at the outlet of the upgraded coal particles is configured to have a conical structure.

[0013] The beneficial effects of the utility model are:

[0014] One advantage of the utility model is that it uses a straight heat exchange tube in combination with a spiral hot flue gas channel to achieve the purpose of secondary heat exchange, thereby ensuring the heat exchange efficiency and avoiding the problem of the spiral heat exchange tube crashing into solid quality-improved coal particles;

[0015] One advantage of the utility model is that it provides a spiral hot flue gas channel which is surrounded by a swirl plate spirally arranged in an air intake jacket. The flue gas enters the heat exchange tube in a spiral swirl along the tangential direction. Compared with the air intake jacket of the cavity, the heat exchange shell path can be extended, and at the same time the flow rate of the hot flue gas is guaranteed, which can ensure that the hot flue gas can exchange heat with the solid upgraded coal particles upward in the vertical direction of the heat exchange tube. Description of the drawings:

[0016] Attached Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Attached Figure 2 It is a schematic diagram of the internal structure of the utility model; in the accompanying drawings:

[0018] 1. Upper cylinder; 2. Lower cylinder; 3. Expansion joint; 4. Air inlet jacket; 5. Hot flue gas inlet; 6. Air outlet jacket; 7. Hot flue gas outlet; 8. Inlet for upgraded coal particles; 9. Outlet for upgraded coal particles; 10. Heat exchange tube; 11. Swirl plate; 12. Spiral hot flue gas channel. Specific implementation method:

[0019] In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "left", "right", "rear", "lower left", "upper right", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0020] Specific implementation of the utility model: the shell and tube heat exchanger for hot flue gas and solid upgraded coal particles comprises a heat exchange cylinder; an upgraded coal particle inlet 8 is provided at the upper end of the heat exchange cylinder, and an upgraded coal particle outlet 9 is provided at the lower end of the heat exchange cylinder, characterized in that a preset number of heat exchange tubes 10 are arranged in parallel along the axial direction in the heat exchange cylinder;

[0021] The heat exchange cylinder is divided into an upper cylinder 1 and a lower cylinder 2; the outer side of the upper cylinder 1 is provided with an air outlet jacket 6, and the outer side of the lower cylinder 2 is provided with an air inlet jacket 4; a spiral hot flue gas channel 12 is arranged in the air inlet jacket 4, and a hot flue gas inlet 5 is opened at the upper end of the air inlet jacket 4, and the hot flue gas inlet 5 is connected with one end of the spiral hot flue gas channel 12; one end of the heat exchange tube 10 passes through the outer wall of the lower cylinder 2 and is connected with the other end of the spiral hot flue gas channel 12, and the other end of the heat exchange tube 10 passes through the outer wall of the upper cylinder 1 and is connected with the air outlet jacket 6.

[0022] Furthermore, the gas outlet jacket 6 is provided with a hot flue gas outlet 7 .

[0023] Furthermore, the heat exchange cylinder is divided into an upper cylinder 1 and a lower cylinder 2 , and the upper cylinder 1 and the lower cylinder 2 are connected via an expansion joint 3 .

[0024] Furthermore, the spiral hot flue gas channel 12 is enclosed by a swirl plate 11 spirally arranged in the air intake jacket 4 .

[0025] Furthermore, the swirl plate 11 , the air inlet jacket 4 and the wall of the lower cylinder 2 form a spiral hot flue gas channel 12 .

[0026] Furthermore, the lower end of the heat exchange cylinder located at the upgraded coal particle outlet 9 is configured to be a conical structure.

[0027] It should be noted that the utility model is a shell and tube heat exchanger for hot flue gas and solid upgraded coal particles.

[0028] The high-temperature hot flue gas enters the spiral hot flue gas channel 12 of the air inlet jacket 4 from the hot flue gas inlet 5 at a certain flow rate, further enters the heat exchange tube 10 at the bottom of the heat exchange cylinder, further enters the air outlet jacket 6, and is discharged through the hot flue gas outlet 7;

[0029] At the same time, the solid upgraded coal particles enter the inner tube of the heat exchange cylinder of the shell and tube heat exchanger from the upgraded coal particle inlet 8. Inside the heat exchange cylinder, the solid upgraded coal particles move downward. While the solid upgraded coal particles move, the first heat exchange process between the outer wall of the heat exchange tube 10 and the solid upgraded coal particles is realized. At the same time, the upgraded coal solid particles continue to move downward. During the movement, the upgraded coal particles continuously exchange heat with the heat exchange tube 10. The solid upgraded coal particles continue to flow downward in the vertical direction of the heat exchange tube 10. When the solid upgraded coal particles flow to the position of the air intake jacket 4, the high-temperature gas in the spiral hot flue gas channel 12 further exchanges heat for the second time through the inner wall of the heat exchange cylinder and the solid upgraded coal particles, so that the solid upgraded coal particles are evenly heated under the dual heat exchange of the heat exchange tube 10 and the air intake jacket 4. The heated solid upgraded coal particles continue to flow downward to the upgraded coal particle outlet 9 at the bottom of the shell and tube heat exchanger and enter the dust removal device for use as filter material in the filter section.

[0030] In this way, the straight heat exchange tube 10 is used in conjunction with the spiral hot flue gas channel 12 to achieve the purpose of secondary heat exchange, ensuring the heat exchange efficiency while also preventing the spiral heat exchange tube from crashing into the solid quality-improved coal particles;

[0031] Furthermore, as a preferred embodiment of the present invention, the spiral hot flue gas channel 12 is enclosed by a swirl plate 11 spirally arranged in the air intake jacket 4. The flue gas enters the heat exchange tube 10 in a spiral swirl along the tangential direction. Relative to the air intake jacket 4 of the cavity, the heat exchange shell path can be extended, while ensuring the flow rate of the hot flue gas, and ensuring that the hot flue gas can exchange heat with the solid upgraded coal particles in the vertical direction upward along the heat exchange tube 10.

[0032] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A shell and tube heat exchanger for hot flue gas and solid upgraded coal particles, comprising a heat exchange cylinder; an upgraded coal particle inlet (8) is provided at the upper end of the heat exchange cylinder, and an upgraded coal particle outlet (9) is provided at the lower end of the heat exchange cylinder, characterized in that: A preset number of heat exchange tubes (10) are arranged in parallel in the heat exchange cylinder along the axial direction; The heat exchange cylinder is divided into an upper cylinder (1) and a lower cylinder (2); the outer side of the upper cylinder (1) is provided with an air outlet jacket (6), and the outer side of the lower cylinder (2) is provided with an air inlet jacket (4); a spiral hot flue gas channel (12) is arranged in the air inlet jacket (4), and a hot flue gas inlet (5) is provided at the upper end of the air inlet jacket (4), and the hot flue gas inlet (5) is connected to one end of the spiral hot flue gas channel (12); one end of the heat exchange tube (10) passes through the outer wall of the lower cylinder (2) and is connected to the other end of the spiral hot flue gas channel (12), and the other end of the heat exchange tube (10) passes through the outer wall of the upper cylinder (1) and is connected to the air outlet jacket (6).

2. The shell and tube heat exchanger for hot flue gas and solid upgraded coal particles according to claim 1, characterized in that The gas outlet jacket (6) is provided with a hot flue gas outlet (7).

3. The shell and tube heat exchanger for hot flue gas and solid upgraded coal particles according to claim 1, characterized in that The heat exchange cylinder is divided into an upper cylinder (1) and a lower cylinder (2), and the upper cylinder (1) and the lower cylinder (2) are connected via an expansion joint (3).

4. The shell and tube heat exchanger for hot flue gas and solid upgraded coal particles according to claim 1, characterized in that The spiral hot flue gas channel (12) is formed by enclosing a swirl plate (11) which is spirally arranged in the air intake jacket (4).

5. The shell and tube heat exchanger for hot flue gas and solid upgraded coal particles according to claim 4, characterized in that The swirl plate (11), the air inlet jacket (4) and the wall of the lower cylinder (2) form a spiral hot flue gas channel (12).

6. The shell and tube heat exchanger for hot flue gas and solid upgraded coal particles according to claim 1, characterized in that The lower end of the heat exchange cylinder located at the upgraded coal particle outlet (9) is configured to have a conical structure.

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