Efficient energy-saving heat exchange equipment for coal chemical industry

Abstract

The utility model discloses coal chemical engineering efficient energy-saving heat exchange equipment which comprises a bottom plate and a cylindrical hollow water jacket fixed at the top end of the bottom plate, and a hollow smoke collecting ring is fixed at the opening position of the top end of the cylindrical hollow water jacket. A cross-shaped cage column type smoke exhaust heat exchanger exchanging heat with cooling liquid in the cylindrical hollow water jacket is installed at the bottom end of the hollow smoke collecting ring, an air inlet pipe allowing high-temperature smoke to enter is installed in the center of the top end of the cross-shaped cage column type smoke exhaust heat exchanger, and a smoke exhaust pipe allowing the smoke to be exhausted is installed on one side of the top end of the hollow smoke collecting ring. Flue gas is divided into a plurality of air flows through the design of the cross-shaped cage column type smoke exhaust heat exchanger, the contact area of each air flow and cold water is increased when the air flows flow in the pipeline, the heat exchange opportunities are increased accordingly, the residence time of the flue gas in the heat exchanger can be effectively prolonged through the design, and the heat exchange efficiency is improved. And the heat exchange area between the flue gas and water is increased, so that the heat recovery efficiency is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal furnace flue gas heat exchange, in particular to a coal chemical industry high-efficiency energy-saving heat exchange equipment. Background Art

[0002] Energy-saving heat exchangers for coal furnace flue gas improve the thermal efficiency of coal furnaces and reduce environmental pollution. The structure of this type of energy-saving heat exchanger mainly consists of five parts: shell, heat exchange tube, flue gas inlet and outlet, medium inlet and outlet, and support structure. The shell serves as the outer shell, responsible for protecting and supporting the internal components, and is usually made of high-temperature resistant and corrosion-resistant materials such as carbon steel or stainless steel. The heat exchange tube is the core of heat transfer and is usually made of high thermal conductivity materials. The flue gas flows outside the tube, while the medium to be heated (such as water or air) flows inside the tube to achieve effective heat exchange. When the high-temperature flue gas generated by the combustion of the coal furnace enters the heat exchanger, the heat is transferred to the medium flowing inside through the heat exchange tube. The specific process is that when the high-temperature flue gas flows through the heat exchanger, the heat is transferred to the medium inside the tube through the tube wall, so that the medium temperature gradually increases, and the flue gas temperature decreases accordingly. The efficiency of heat exchange is related to the temperature difference and the heat exchange area. Changes in flow rate will also affect the heat transfer efficiency. However, during the operation of the current heat exchanger, the flue gas moves in the heat exchange tube in one direction as a whole airflow, and the medium to be heated flows in the pipe inside the shell. At this time, the heat exchange area and heat exchange time between the whole flue gas flow and the heat exchange tube and the inside of the heat exchange tube are relatively low. The heat exchange in the flue gas is not sufficient and is sent out of the heat exchanger. That is, due to the fast flue gas flow rate, the heat exchange time between the flue gas and the heat exchange tube is relatively short, and the flue gas temperature at the heat exchanger outlet is still high, resulting in reduced heat transfer efficiency and difficulty in achieving effective heat recovery. Utility Model Content

[0003] The purpose of the utility model is to provide a high-efficiency and energy-saving heat exchange equipment for coal chemical industry, so that the flue gas generated by the coal furnace flue gas enters the cross-shaped cage-column smoke exhaust heat exchanger, and the cross-shaped cage-column smoke exhaust heat exchanger is divided into several air flows, so that several high-temperature flue gas air flows are heat-exchanged with the cross-shaped cage-column smoke exhaust heat exchanger and the cold water in the cylindrical hollow water jacket. The flue gas after heat exchange is discharged into the next-level flue gas treatment equipment through the hollow smoke collecting ring and the smoke exhaust pipe, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a coal chemical industry high-efficiency and energy-saving heat exchange equipment, comprising a base plate and a cylindrical hollow water jacket fixed on the top of the base plate, a hollow smoke collecting ring fixed at the opening position of the top of the cylindrical hollow water jacket, and a cross-shaped cage-column smoke exhaust heat exchanger for exchanging heat with the coolant inside the cylindrical hollow water jacket is installed at the bottom end of the hollow smoke collecting ring, an air inlet pipe for high-temperature flue gas to enter is installed at the center position of the top of the cross-shaped cage-column smoke exhaust heat exchanger, and an exhaust pipe for exhausting flue gas is installed on one side of the top of the hollow smoke collecting ring.

[0005] Preferably, an upper liquid inlet valve is installed on one side of the top end of the cylindrical hollow water jacket, and a lower liquid outlet valve is installed on one side of the bottom end of the cylindrical hollow water jacket.

[0006] Preferably, the smoke exhaust pipe is U-shaped, and the bottom end opening of the smoke exhaust pipe is vertically downward.

[0007] Preferably, the cross-shaped cage-column type smoke exhaust heat exchanger includes an upper cross-shaped smoke collecting shell installed on the lower surface of the hollow smoke collecting ring, a lower cross-shaped smoke collecting shell installed on the top of the bottom plate, and several smoke guide pipes installed between the lower cross-shaped smoke collecting shell and the upper cross-shaped smoke collecting shell. The main central smoke pipe is installed at the center position of the top of the lower cross-shaped smoke collecting shell, the air intake pipe is installed at the center position of the top of the main central smoke pipe, and the upper surface of the upper cross-shaped smoke collecting shell is provided with a through hole interconnected with the hollow smoke collecting ring.

[0008] Preferably, the main central smoke pipe and the smoke guide pipe are both made of copper.

[0009] Preferably, four equally spaced support arms are integrally formed at the edge of the bottom end of the hollow smoke collecting ring, and the support arms are plugged into the upper cross-shaped smoke collecting shell and the lower cross-shaped smoke collecting shell.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: the coal chemical industry's high-efficiency and energy-saving heat exchange equipment is provided with a cross-shaped cage-column smoke exhaust heat exchanger, a hollow smoke collecting ring, a cylindrical hollow water jacket and other mutually coordinated structures. The design of the cross-shaped cage-column smoke exhaust heat exchanger divides the flue gas into multiple airflows, so that each airflow increases its contact area with the cold water when flowing in the pipeline, and the opportunity for heat exchange also increases accordingly. This design can effectively extend the residence time of the flue gas in the heat exchanger, increase the heat exchange area between the flue gas and water, and thus significantly improve the heat recovery efficiency. The cold water flows on the outside of the flue gas through the cylindrical hollow water jacket, and can fully contact each airflow, making the heat exchange effect more balanced and efficient. Moreover, since the flue gas is divided into multiple airflows, each airflow can pass through each part of the heat exchanger evenly, avoiding the "dead corner" phenomenon of high-speed airflow, and ensuring that each part of the flue gas can fully exchange heat with water, thereby improving the overall heat recovery efficiency of the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0013] Figure 3 This is a schematic diagram of the three-dimensional cross-sectional structure of the cylindrical hollow water jacket of the present invention after removal;

[0014] Figure 4 This is a schematic diagram of the three-dimensional structure of the cylindrical hollow water jacket of the present invention after removal;

[0015] Figure 5 This is a schematic diagram of the three-dimensional structure of the hollow smoke collecting ring of the utility model;

[0016] Figure 6 This is a schematic diagram of the three-dimensional structure of the cross-shaped cage-column type smoke exhaust heat exchanger of the present invention.

[0017] In the figure: 1. bottom plate; 2. cylindrical hollow water jacket; 3. lower liquid outlet valve; 4. upper liquid inlet valve; 5. cross-shaped cage-column smoke exhaust heat exchanger; 501. lower cross-shaped smoke collecting shell; 502. upper cross-shaped smoke collecting shell; 503. main center smoke pipe; 504. smoke guide pipe; 6. air inlet pipe; 7. hollow smoke collecting ring; 701. support arm; 8. smoke exhaust pipe; 9. through hole. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-6 The utility model provides an embodiment of a coal chemical industry high-efficiency energy-saving heat exchange equipment, comprising a base plate 1 and a cylindrical hollow water jacket 2 fixed to the top of the base plate 1, a hollow smoke collecting ring 7 fixed at the opening position of the top of the cylindrical hollow water jacket 2, and a cross-shaped cage column type smoke exhaust heat exchanger 5 for exchanging heat with the coolant inside the cylindrical hollow water jacket 2 is installed at the bottom end of the hollow smoke collecting ring 7, an air inlet pipe 6 for high-temperature flue gas to enter is installed at the center position of the top of the cross-shaped cage column type smoke exhaust heat exchanger 5, and a smoke exhaust pipe 8 for exhausting flue gas is installed on one side of the top of the hollow smoke collecting ring 7;

[0020] An upper liquid inlet valve 4 is installed on one side of the top end of the cylindrical hollow water jacket 2, and a lower liquid outlet valve 3 is installed on one side of the bottom end of the cylindrical hollow water jacket 2. The smoke exhaust pipe 8 is U-shaped, and the bottom end opening of the smoke exhaust pipe 8 is vertically downward. The upper liquid inlet valve 4 and the lower liquid outlet valve 3 are respectively connected to the external cooling water pumping end and the water load end. At this time, cold water can enter the cylindrical hollow water jacket 2 and always contact the pipeline channel of the cross-shaped cage column type smoke exhaust heat exchanger 5. When the cold water flows in the water jacket, it absorbs heat from the flue gas and the cross-shaped cage column type smoke exhaust heat exchanger 5, causing the temperature of the cold water to rise. After heat exchange, it can be used for other process needs, such as heating or preheating combustion air.

[0021] The cross-shaped cage column type smoke exhaust heat exchanger 5 includes an upper cross-shaped smoke collecting shell 502 installed on the lower surface of the hollow smoke collecting ring 7, a lower cross-shaped smoke collecting shell 501 installed on the top of the bottom plate 1, and a plurality of smoke guide pipes 504 installed between the lower cross-shaped smoke collecting shell 501 and the upper cross-shaped smoke collecting shell 502. The main central smoke pipe 503 is installed at the center position of the top of the lower cross-shaped smoke collecting shell 501, and the air intake pipe 6 is installed at the center position of the top of the main central smoke pipe 503. The upper surface of the upper cross-shaped smoke collecting shell 502 is provided with a through hole 9 that is interconnected with the hollow smoke collecting ring 7. The through hole 9 serves to connect the upper cross-shaped smoke collecting shell 502 and the hollow smoke collecting ring 7 to ensure that the smoke is normally discharged through the hollow smoke collecting ring 7 and the smoke exhaust pipe 8;

[0022] When the flue gas enters the cross-shaped cage-column type smoke exhaust heat exchanger 5, the flue gas flows downward through the main central smoke pipe 503 and enters the lower cross-shaped smoke collecting shell 501. The lower cross-shaped smoke collecting shell 501 serves to connect the various smoke guide pipes 504. At this time, the flue gas is diverted and enters each smoke guide pipe 504 one by one, and the flue gas continues to ascend. During this process, the flue gas continues to exchange heat with the cold water in the cylindrical hollow water jacket 2. The flue gas with gradually lowered temperature will enter the upper cross-shaped smoke collecting shell 502 and gather inside it. By dividing the flue gas into several airflows, the problem of uneven flow speed of the flue gas in the traditional design is avoided.

[0023] The main central smoke pipe 503 and the smoke guide pipe 504 are both made of copper. The thermal conductivity of the copper smoke guide pipe 504 and the main central smoke pipe 503 is much higher than that of other metals such as aluminum or stainless steel. This allows the copper heat exchange pipe to quickly and effectively transfer heat during the heat exchange process, significantly improving the heat exchange efficiency.

[0024] Four equally spaced support arms 701 are integrally formed at the edge of the bottom end of the hollow smoke collecting ring 7. The support arms 701 are plugged into the upper cross-shaped smoke collecting shell 502 and the lower cross-shaped smoke collecting shell 501. The support arms 701 improve the connection stability between the hollow smoke collecting ring 7 and the upper cross-shaped smoke collecting shell 502 and the lower cross-shaped smoke collecting shell 501.

[0025] When the embodiment of the present application is in use, the staff first connects the air intake pipe 6 to the smoke outlet of the coal stove through a pipe, and connects the smoke exhaust pipe 8 to the next-level smoke treatment equipment. The air intake pipe 6 is responsible for guiding the high-temperature smoke generated by the combustion of the coal stove to the cross-shaped cage column type smoke exhaust heat exchanger 5. The temperature of the smoke is extremely high during the combustion process of the coal stove. The structural design of the air intake pipe 6 ensures that the smoke can flow smoothly into the heat exchanger. After the smoke enters the cross-shaped cage column type smoke exhaust heat exchanger 5 through the air intake pipe 6, the cross-shaped cage column type smoke exhaust heat exchanger 5 divides the smoke into several air flows after entering, and flows from bottom to top to the hollow smoke collecting ring 7 and the smoke exhaust pipe 8. The diversion structural design not only increases the heat exchange area between the smoke and the cold water in the cylindrical hollow water jacket 2, but also increases the contact time between the smoke and the cold water, ensuring the heat energy between the cold water and the smoke The heat is effectively transferred. At this time, the heat is transferred from the high-temperature flue gas to the cold water. The temperature of the cold water gradually increases, while the temperature of the flue gas decreases. The cylindrical hollow water jacket 2 surrounds the flue gas flow channel of the cross-shaped cage-column type smoke exhaust heat exchanger 5, which can provide a larger surface area. After heat exchange, the temperature of the flue gas is significantly reduced. Next, the flue gas flows into the hollow smoke collecting ring 7. The hollow smoke collecting ring 7 collects the flue gas passing through the cross-shaped cage-column type smoke exhaust heat exchanger 5 and guides it to the exhaust pipe to ensure that the flue gas can be evenly distributed and all airflows are effectively collected. The flue gas collected by the hollow smoke collecting ring 7 is discharged through the exhaust pipe 8 and sent to the next-level flue gas treatment equipment. The temperature of the flue gas after treatment by the heat exchanger has been significantly reduced, and the heat contained is relatively small. This can reduce the burden on subsequent processing equipment and improve its work efficiency.

Claims

1. A coal chemical high-efficiency energy-saving heat exchange equipment, characterized by: The invention comprises a bottom plate (1) and a cylindrical hollow water jacket (2) fixed at the top of the bottom plate (1); a hollow smoke collecting ring (7) is fixed at the opening position of the top of the cylindrical hollow water jacket (2); and a cross-shaped cage column type smoke exhaust heat exchanger (5) for exchanging heat with the internal coolant of the cylindrical hollow water jacket (2) is installed at the bottom end of the hollow smoke collecting ring (7); an air inlet pipe (6) for high-temperature smoke to enter is installed at the center position of the top of the cross-shaped cage column type smoke exhaust heat exchanger (5); and a smoke exhaust pipe (8) for exhausting smoke is installed on one side of the top of the hollow smoke collecting ring (7).

2. The coal chemical high-efficiency energy-saving heat exchange equipment according to claim 1, characterized in that: An upper liquid inlet valve (4) is installed on one side of the top end of the cylindrical hollow water jacket (2), and a lower liquid outlet valve (3) is installed on one side of the bottom end of the cylindrical hollow water jacket (2).

3. The coal chemical high-efficiency energy-saving heat exchange equipment according to claim 1, characterized in that: The smoke exhaust pipe (8) is U-shaped, and the bottom end opening of the smoke exhaust pipe (8) is vertically downward.

4. The coal chemical high-efficiency energy-saving heat exchange equipment according to claim 1, characterized in that: The cross-shaped cage column type smoke exhaust heat exchanger (5) comprises an upper cross-shaped smoke collecting shell (502) installed on the lower surface of a hollow smoke collecting ring (7), a lower cross-shaped smoke collecting shell (501) installed on the top of a bottom plate (1), and a plurality of smoke guide pipes (504) installed between the lower cross-shaped smoke collecting shell (501) and the upper cross-shaped smoke collecting shell (502); a main central smoke pipe (503) is installed at the center position of the top of the lower cross-shaped smoke collecting shell (501); the air intake pipe (6) is installed at the center position of the top of the main central smoke pipe (503); and a through hole (9) is provided on the upper surface of the upper cross-shaped smoke collecting shell (502) and is interconnected with the hollow smoke collecting ring (7).

5. The coal chemical high-efficiency energy-saving heat exchange equipment according to claim 4, characterized in that: The main central smoke pipe (503) and the smoke guide pipe (504) are both made of copper.

6. The coal chemical high-efficiency energy-saving heat exchange equipment according to claim 4, characterized in that: Four equally spaced support arms (701) are integrally formed at the edge of the bottom end of the hollow smoke collecting ring (7), and the support arms (701) are plugged into the upper cross-shaped smoke collecting shell (502) and the lower cross-shaped smoke collecting shell (501).

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