Gas heat exchanger

Abstract

The utility model provides a coal gas heat exchanger, which belongs to the technical field of heat exchange equipment, and comprises a fan used for providing forced airflow for a dry cooling section and a wet cooling section; the dry cooling section comprises air cooling fins, and the air cooling fins are used for cooling through air convection; the wet cooling section comprises a spraying system and a heat exchange coil pipe, and the spraying system is used for spraying circulating water to the surface of the heat exchange coil pipe to reduce the temperature of gas in the heat exchange coil pipe; the water circulation system comprises a water tank and a water pump and is used for recycling the spraying water and reusing the spraying water as circulating water; according to the scheme, the header box is used for replacing a bent part of the heat exchange pipe, airflow distribution is optimized, the heat exchange efficiency is improved, the improved design eliminates the bending stress of the heat exchange pipe, the short plate of the heat exchanger is supplemented, the phenomena of pressure drop increase and pipeline corrosion caused by blockage are avoided, the overall service life of the heat exchanger is prolonged by more than two times, the pressure drop is reduced by 20%, and more energy is saved.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange equipment technology, specifically to a gas heat exchanger. Background Technology

[0002] In the coke oven gas to hydrogen production process, it is usually necessary to cool the pressurized coke oven gas. Open cooling towers are the most commonly used cooling equipment in the industry due to their simple structure, low cost, and ease of maintenance. However, these cooling towers have drawbacks, including high operating costs and non-compliance with national energy and water conservation policies.

[0003] To address these issues, we introduced a more advanced evaporative air cooler. An evaporative air cooler includes a fan, dry cooling section, wet cooling section, water circulation system, and water pump. This equipment not only has a small footprint and low energy consumption, but also boasts high efficiency and excellent long-term energy-saving performance. Its long lifespan and stable cooling effect also make it a sustainable option.

[0004] Nevertheless, while the multiple bending processes of the wet cooling section heat exchange tubes in evaporative air coolers reduce manufacturing costs and shorten production cycles, these bends lead to thinner tube walls, stress concentration, and a reduced inner diameter. During actual operation, airflow slows down at these bends, making it easier for corrosive substances to accumulate. This not only increases the pressure drop in the air cooler, leading to increased energy consumption in the overall production process, but also causes corrosion and leakage at the bends, significantly shortening the overall lifespan of the heat exchanger and weakening the expected cooling efficiency, ultimately impacting the company's normal production and economic benefits. Utility Model Content

[0005] The purpose of this invention is to provide a gas heat exchanger to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A gas heat exchanger, comprising:

[0008] Fans are used to provide forced airflow for dry cooling sections and wet cooling sections;

[0009] The dry cooling section includes air-cooled fins, which are used for cooling by air convection;

[0010] The wet cooling section includes a spray system and heat exchange coils. The spray system is used to spray circulating water onto the surface of the heat exchange coils to reduce the temperature of the gas inside the heat exchange coils.

[0011] A water recycling system, including a water tank and a water pump, is used to recycle spray water and reuse it as circulating water.

[0012] The heat exchange coil is characterized in that it includes a heat exchange tube for gas flow and a manifold box installed at the bend of the heat exchange tube. The manifold box replaces the bend and is used to collect and redistribute the airflow. The two ends of the heat exchange tube are respectively connected to an inlet pipe box and an outlet pipe box. An air inlet is connected to the inlet pipe box, and an air outlet is connected to the outlet pipe box.

[0013] As a further improvement, each bend of the heat exchange tube is provided with a manifold box.

[0014] As a further improvement, the manifold box is an elliptical tube sealed at both ends.

[0015] As a further improvement, each bend of the heat exchange tube is provided with two manifold boxes.

[0016] As a further improvement, the two manifold boxes at the same bend are connected by a bend, with one manifold box connected to the heat exchange pipe before the bend and the other manifold box connected to the heat exchange pipe after the bend.

[0017] As a further improvement, the manifold box is a round pipe with sealed ends.

[0018] As a further improvement, the heat exchange tubes are distributed in several layers along the length of the manifold.

[0019] As a further improvement, the heat exchange coil is arranged in an S-shape.

[0020] The beneficial effects of the above-mentioned technical solution of this utility model are as follows:

[0021] This solution replaces the bends in the heat exchange tubes with manifolds, concentrating and redistributing airflow. This effectively reduces the accumulation and blockage of impurities at bends, thus avoiding increased pressure drop and pipe corrosion caused by blockages. The manifold design optimizes airflow distribution and improves heat exchange efficiency. The improved design eliminates bending stress in the heat exchange tubes, addresses the shortcomings of the heat exchanger, balances corrosion and blockage rates, increases overall lifespan by more than 2 times, reduces pressure drop by 20%, and is more energy-efficient. Attached Figure Description

[0022] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0023] Figure 1 A three-dimensional structural schematic diagram of Embodiment 1 provided by this utility model;

[0024] Figure 2 A side view of Embodiment 1 provided by this utility model;

[0025] Figure 3 A schematic diagram of the manifold structure for Embodiment 1 of this utility model;

[0026] Figure 4 A front view of Embodiment 2 provided by this utility model;

[0027] Figure 5 A side view of Embodiment 2 provided by this utility model;

[0028] Figure 6 A top view of Embodiment 2 provided by this utility model;

[0029] Figure 7 Schematic diagram of the tube box structure of Embodiment 2 provided by this utility model Figure 1 ;

[0030] Figure 8 Schematic diagram of the tube box structure of Embodiment 2 provided by this utility model Figure 2 .

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Heat exchanger coil; 2. Air inlet; 3. Inlet pipe box; 4. Heat exchanger tube; 5. Manifold box; 6. Bend; 7. Outlet pipe box; 8. Air outlet. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0034] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the existing technology, the heat exchange tube 4 of the wet cooling section of the evaporative air cooler has a thinner tube wall and a smaller tube diameter due to bending processing, which can easily cause blockage in actual operation, leading to pipeline corrosion and leakage.

[0036] To address these issues, this solution replaces the bends in the heat exchange tubes 4 with a manifold box 5. The design of the manifold box 5 avoids the accumulation, blockage, and corrosion of impurities at the bends. Gas enters the inlet tube box 3 through the inlet port 2 and is then evenly distributed into each heat exchange tube 4. After flowing within the heat exchange tubes 4, the gas enters the manifold box 5 for collection and is redistributed to the next section of heat exchange tubes 4. Finally, the gas flows out through the outlet port 8, completing the cooling process.

[0037] After introducing the basic principles of this utility model, various non-limiting embodiments of this utility model are described in detail below. Any quantity of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning.

[0038] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0039] Example 1 of the gas heat exchanger provided by this utility model:

[0040] A gas heat exchanger, comprising:

[0041] Fans are used to provide forced airflow for the dry cooling section and the wet cooling section;

[0042] The dry cooling section includes air-cooled fins for cooling via air convection;

[0043] The wet cooling section includes a spray system and a heat exchange coil 1. The spray system is used to spray circulating water onto the surface of the heat exchange coil 1 to reduce the temperature of the gas inside the heat exchange coil 1.

[0044] A water recycling system, including a water tank and a water pump, is used to recover spray water and reuse it as recycled water.

[0045] The above are all existing technologies, and specific details will not be elaborated here.

[0046] like Figure 1-3 As shown, the heat exchange coil 1 includes heat exchange tubes 4 for gas flow and manifold boxes 5 installed at the bends of the heat exchange tubes 4. Each bend of the heat exchange tubes 4 is provided with a manifold box 5, which replaces the bend and is used to collect and redistribute the airflow. The design of the manifold box 5 reduces the risk of impurity accumulation and blockage, while optimizing airflow distribution and improving heat exchange efficiency.

[0047] like Figure 1-3As shown, the heat exchange coil 1 is arranged in an S-shape, which makes the gas flow path longer and increases the contact time and area between the gas and the wall of the heat exchange tube 4. The heat exchange tube 4 is arranged in a single-pass double-layer staggered arrangement, with several groups distributed along the length of the manifold box 5, which makes the gas flow in the heat exchange tube 4 more uniform and reduces the problem of uneven local airflow. The inlet end of the heat exchange tube 4 is connected to the inlet tube box 3, and the inlet 2 is fixedly installed on the inlet tube box 3. The outlet end of the heat exchange tube 4 is connected to the outlet tube box 7, and the outlet 8 is fixedly installed on the outlet tube box 7.

[0048] To further improve the heat exchange efficiency of the heat exchange coil 1, the manifold box 5 is designed as an elliptical tube with both ends sealed. The elliptical tube has good aerodynamic characteristics, low flow resistance, and a long heat transfer perimeter under the condition of equal cross-sectional area, which is conducive to heat transfer and compact structure.

[0049] We sampled and tested the circulating water in the equipment. The chloride ion content in the circulating water was 43.6 mg / L. The air cooler's medium inlet temperature was 145℃. At this temperature, the chloride ion tolerance of 304 stainless steel is less than 10 mg / L, which does not meet the requirements of this scheme. Therefore, the material selected for manifold 5 is hot-dip galvanized seamless steel pipe. Galvanized carbon steel has the characteristics of corrosion resistance and wear resistance, is not affected by chloride ions, is easy to cold and hot process, and has a relatively low cost.

[0050] like Figure 1-3 As shown, the heat exchange tube 4 is connected to the inlet tube box 3, the manifold box 5 and the outlet tube box 7 by a fixed connection. In this embodiment, the fixed connection adopts the argon arc welding method, which combines the advantages of electric arc welding and argon arc welding, effectively improving efficiency and saving costs.

[0051] Example 2 of the gas heat exchanger provided by this utility model:

[0052] Its main difference from Example 1 is:

[0053] like Figure 4-8 As shown, each bend of the heat exchange tube 4 is provided with two manifold boxes 5, which are connected by a bend 6. One manifold box 5 is connected to the heat exchange tube 4 before the bend, and the other manifold box 5 is connected to the heat exchange tube 4 after the bend.

[0054] Compared to single-tube heat exchangers, dual-tube heat exchangers offer stronger cooling performance. The length of the four straight tube sections in a dual-tube heat exchanger is increased compared to a single-tube heat exchanger. While single-tube heat exchangers are bulky and occupy a larger effective heat exchange area, dual-tube heat exchangers require less space and can also solve the problem of blockage at bends while maintaining effective cooling.

[0055] Furthermore, in this embodiment, the manifold 5 is designed as a circular tube sealed at both ends. Compared with elliptical tubes, circular tube heat exchangers offer better heat exchange performance and are simpler to manufacture, resulting in lower costs.

[0056] The above-described preferred embodiments of the present invention are provided for guidance, but it will be apparent to those skilled in the art that such embodiments are provided merely by way of example. Many modifications, alterations, and alternatives will arise in the mind and spirit of the present invention without departing from its intent. It should be understood that various alternatives to the embodiments of the present invention described herein may be employed in the practice of the present invention. The appended claims are intended to define the scope of protection of the present invention and therefore cover the modular compositions, equivalents, or alternatives within the scope of these claims.

Claims

1. A gas heat exchanger, comprising: Fans are used to provide forced airflow for dry cooling sections and wet cooling sections; The dry cooling section includes air-cooled fins, which are used for cooling by air convection; The wet cooling section includes a spray system and a heat exchange coil (1). The spray system is used to spray circulating water onto the surface of the heat exchange coil (1) to reduce the temperature of the gas inside the heat exchange coil (1). A water recycling system, including a water tank and a water pump, is used to recycle spray water and reuse it as circulating water. The heat exchange coil (1) is characterized in that it includes a heat exchange tube (4) for gas flow and a manifold box (5) installed at the bend of the heat exchange tube (4). The manifold box (5) replaces the bend and is used to collect and redistribute the airflow. The heat exchange tube (4) is connected to an inlet pipe box (3) and an outlet pipe box (7) at its two ends respectively. An air inlet (2) is connected to the inlet pipe box (3), and an air outlet (8) is connected to the outlet pipe box (7).

2. The gas heat exchanger according to claim 1, characterized in that: Each bend of the heat exchange tube (4) is provided with a manifold box (5).

3. The gas heat exchanger according to claim 2, characterized in that: The manifold box (5) is an elliptical tube sealed at both ends.

4. The gas heat exchanger according to claim 1, characterized in that: Each bend of the heat exchange tube (4) is provided with two manifold boxes (5).

5. The gas heat exchanger according to claim 4, characterized in that: The two manifold boxes (5) at the same bend are connected by a bend (6). One of the manifold boxes (5) is connected to the heat exchange tube (4) before the bend, and the other manifold box (5) is connected to the heat exchange tube (4) after the bend.

6. The gas heat exchanger according to claim 5, characterized in that: The manifold box (5) is a round pipe with both ends sealed.

7. The gas heat exchanger according to any one of claims 1-6, characterized in that: The heat exchange tubes (4) are distributed in several layers along the length of the manifold (5).

8. The gas heat exchanger according to any one of claims 1-6, characterized in that: The heat exchange coil (1) is arranged in an S-shape.

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