Spray tower capable of utilizing waste heat of waste gas

Abstract

The utility model discloses a spray tower for utilizing waste heat of waste gas, which realizes the dual functions of waste gas treatment and waste heat recovery through the integrated design of the spray tower and the waste heat recovery tank. After the high-temperature waste gas passes through the spherical condensation pipeline of the waste heat recovery tank, the waste heat is used for heating the spraying liquid, so that the absorption and neutralization efficiency of the spraying liquid is improved, the energy consumption is reduced, and the operation cost is saved. The spray tower comprises a multi-stage spray area and a demisting area, and adopts a reverse flow design, so that the contact time of waste gas and spray liquid is prolonged, and the purification efficiency is improved. The equipment is compact in structure, small in occupied area and high in adaptability, low-temperature crystallization and blockage risks are reduced through reasonable configuration, the service life of the equipment is prolonged, and efficient and stable operation of the system is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of industrial waste gas treatment and relates to a spray tower for utilizing waste heat from waste gas. Background Technology

[0002] In modern industrial waste gas treatment, the effective treatment of high-temperature waste gas and the recovery and utilization of waste heat resources are two key optimization directions. Traditional waste gas treatment usually relies on ambient temperature spraying, which uses water or alkaline solutions to physically adsorb or chemically neutralize particulate matter and gaseous pollutants in the waste gas. However, this method faces many challenges when treating high-temperature waste gas. Direct contact between high-temperature waste gas and ambient temperature spraying liquid leads to rapid evaporation of the spraying liquid, causing a sharp drop in the moisture content inside the spray tower, which can easily lead to blockage and scaling problems, increasing the maintenance and cleaning costs of the equipment. In addition, the heat carried by the high-temperature waste gas is not fully utilized in the ambient temperature spraying system, resulting in a waste of thermal energy, which further increases the company's energy consumption and operating costs.

[0003] In waste gas treatment technology, heated scrubbing liquid can significantly improve treatment efficiency. Compared with ambient temperature scrubbing liquid, heated scrubbing liquid has significant advantages in both physical and chemical adsorption. First, heated scrubbing liquid has higher absorption efficiency, capable of handling higher concentrations or more difficult-to-remove pollutants, especially acidic gases and volatile organic compounds (VOCs). Ambient temperature scrubbing liquid often has limited effectiveness in treating high-concentration acidic waste gases, while heated scrubbing liquid, due to its higher solubility and reactivity, can more effectively capture and neutralize pollutants in the gas. Second, heated scrubbing liquid accelerates the chemical reaction with pollutants, significantly increasing the reaction rate and shortening the residence time of waste gas in the scrubbing tower, thereby achieving higher treatment efficiency. This characteristic allows the equipment to treat higher volumes of waste gas in a relatively small space, helping to reduce the equipment footprint and lower investment costs.

[0004] During operation, heating the spray solution can also reduce the risk of clogging and scaling. At room temperature, especially when using high-concentration sodium hydroxide solutions, salt crystallization easily occurs due to the low solution temperature, causing equipment blockage and affecting long-term operational stability. Heating the spray solution helps reduce the precipitation and accumulation of salts, significantly reducing the maintenance frequency of the spray tower. However, although heating the spray solution can significantly improve treatment efficiency, directly heating it consumes a large amount of energy, increasing operating costs for many small and medium-sized production enterprises, and may not be the most economical option. Utility Model Content

[0005] In view of the above-mentioned defects in the existing technology, the purpose of this utility model is to propose a spray tower for utilizing waste heat from exhaust gas.

[0006] The objective of this utility model will be achieved through the following technical solution:

[0007] A spray tower for utilizing waste heat from exhaust gas includes a spray tower and a waste heat recovery tank. The spray tower consists of two spray zones, a demisting zone, and a circulating water tank. Each spray zone comprises a lower packing layer and an upper spray system. The waste heat recovery tank is composed of a spherical condensation pipe and a spray liquid circulation heating zone. The lower part of the circulating water tank is connected to the spray liquid circulation heating zone via a pipe. The spray zones are connected to the exhaust outlet of the waste heat recovery tank via a pipe.

[0008] Preferably, the spray tower and the waste heat recovery tank are integrated into one unit, connected to the circulating water tank and the recovery tank via pipelines and acid and alkali resistant water pumps;

[0009] Preferably, the spray water pump and the circulating hot water pump are staggered, with one in front of the other. The inlet pipe of the spray water pump is at the bottom of the circulating water tank, and the outlet pipe of the circulating heating water pump is at the top of the circulating water tank.

[0010] Preferably, the waste heat recovery tank is equipped with spherical condensation pipes, specifically 4-8 spherical condensation pipes, with the diameter of the spheres being 1.5-2 times the pipe diameter;

[0011] Preferably, the water flow direction in the spray liquid circulation heating zone is opposite to the exhaust gas flow direction, and the water flow velocity is set to 0.1-0.5 m / s.

[0012] The outstanding advantages of this invention are: by utilizing the spherical condensation pipes and the spray liquid circulation heating zone within the waste heat recovery tank, the residual heat in the high-temperature waste gas is fully utilized to heat the spray liquid, achieving a dual function of waste gas treatment and waste heat recovery. This not only improves the absorption and neutralization efficiency of the spray liquid but also effectively reduces equipment energy consumption, saving operating costs for enterprises. The spray tower design includes two spray zones; the lower packing layer and the upper spray system work together to enhance the capture efficiency of gaseous pollutants and particulate matter. Simultaneously, the counter-flowing spray liquid and waste gas further improve contact time and reaction efficiency, ensuring that the waste gas is fully purified within a limited space. The spray tower and waste heat recovery tank are integrated into a single design, reducing the equipment's footprint and installation complexity. Furthermore, reasonable pipe connections and acid / alkali resistant water pump configuration ensure long-term stable operation and easy maintenance. The number of spherical condensation pipes in the waste heat recovery tank can be flexibly adjusted according to the waste gas temperature to adapt to different operating conditions, improving the equipment's applicability and processing flexibility. Heated spray liquid effectively avoids the problem of crystallization or solidification deposition under low-temperature conditions, thereby reducing the risk of clogging in the spray tower. This not only extends the service life of the equipment but also reduces maintenance frequency and downtime, improving the overall reliability and stability of the waste gas treatment system.

[0013] In summary, this utility model, through innovative design, cleverly combines the pollutant treatment and waste heat recovery functions of a spray tower, possessing outstanding advantages such as high efficiency and energy saving, thorough decontamination, compact structure, and convenient maintenance. It provides an efficient, economical, and environmentally friendly solution for modern industrial waste gas treatment.

[0014] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] The components include: 1. Spray tower; 11. Demisting area; 12. Observation window; 13. Spray packing; 14. Circulating water tank; 2. Waste heat recovery tank; 21. Spherical condenser tube; 22. Spray liquid circulation heating area; 31. Spray water pump; 32. Circulating heating water pump; 41. Spray pipe; 42. Spray liquid circulation heating pipe; 51. Waste heat recovery tank outlet; 52. Spray tower inlet; 53. Spray tower outlet. Detailed Implementation

[0017] This utility model discloses a spray tower for utilizing waste heat from exhaust gas.

[0018] like Figure 1 As shown, a spray tower for utilizing waste heat from exhaust gas is fixedly installed at the outlet of high-temperature exhaust gas. The equipment consists of a spray tower 1 and a waste heat recovery tank 2 integrated vertically. The spray tower includes a demisting zone 11 and two spray zones from top to bottom. Each spray zone is equipped with an observation window 12. The spray zone is composed of packing material 13 and a spray system 41. The spray liquid is stored in a circulating water tank 14. The waste heat recovery tank 2 is composed of a spherical condenser tube 21 and a spray liquid circulation heating zone 22. The spherical condenser tube is connected to the air inlet 52 of the spray tower through a pipe. The spray liquid circulation heating zone is connected to the circulating water tank 14 through a circulating heating water pump 32 and a circulating heating pipe 42.

[0019] The spray zone can be set with 1-3 levels depending on the actual waste gas pollutants.

[0020] The spray water pump and the circulating heating water pump are positioned one in front of the other, with the spray water pump's inlet pipe at the bottom of the circulating water tank and the circulating heating water pump's outlet pipe at the top of the circulating water tank.

[0021] The number of spheres in the spherical condenser tube 21 is set according to the actual exhaust gas temperature, with a quantity of 4-8 spheres and a sphere diameter of 1.5-2 times the tube diameter.

[0022] The circulating heating water pump 32 is set with a flow rate of 0.1-0.5 m / s according to the actual exhaust gas temperature.

[0023] The working process of this utility model is briefly described below: First, the high-temperature waste gas enters the spherical condenser tube 21 through the left inlet of the waste heat recovery tank 2. After cooling, it flows through the outlet 51 and the pipeline to the inlet 52 of the spray tower. Then, it gradually rises through two stages of spraying, passes through the demisting zone 11, and flows out through 53. The spray liquid flows from the circulating water tank to the spray liquid circulation heating zone 22, flowing in the opposite direction to the waste gas flow to achieve full heat absorption. Then, it flows back to the circulating water tank 14 through the circulation pipe 42. The heated spray liquid can enter the spray system through the spray pipe 41.

[0024] This invention utilizes the waste heat from high-temperature waste gas to heat the spray liquid through spherical condensation pipes and a circulating heating zone in a waste heat recovery tank, achieving a dual function of waste gas treatment and waste heat recovery. The heated spray liquid improves absorption and neutralization efficiency, reduces energy consumption, and saves operating costs. The spray tower features a lower packing layer and an upper spray system, with dual spray zones enhancing the capture of gaseous pollutants and particulate matter. The spray liquid and waste gas flow in opposite directions, improving reaction efficiency and ensuring thorough purification. The equipment adopts an integrated design, occupying a small area and being easy to install. Reasonable pipe connections and acid / alkali resistant pumps ensure stable operation. The number of spherical condensation pipes can be adjusted according to the waste gas temperature, improving system adaptability. Heating the spray liquid reduces the risk of low-temperature crystallization and blockage, extending equipment life, reducing maintenance frequency, and improving system stability and reliability. For those skilled in the art, the specific structure and dimensions of this invention are not fixed and should be adjusted according to actual waste gas treatment needs. The scope of protection of this invention is defined by the appended claims, and not by the above embodiments. Therefore, all variations within the equivalent elements and scope of the claims should be included within the protection scope of this utility model. Furthermore, although embodiments are described in this specification, these embodiments are not the only independent technical solutions; their description is for clarity only. Those skilled in the art should understand the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other understandable technical solutions.

Claims

1. A spray tower for utilizing waste heat from exhaust gas, comprising a spray tower (1) and a waste heat recovery tank (2), characterized in that: The spray tower consists of two spray zones (12), a demisting zone (11), and a circulating water tank (13); the spray zone includes a lower packing layer and an upper spray system; the waste heat recovery tank consists of a spherical condensation pipe (21) and a spray liquid circulation heating zone (22); the circulating water tank is connected to the spray liquid circulation heating zone through a spray liquid circulation heating pipe (42); the spray zone is connected to the outlet (51) of the waste heat recovery tank through a spray tower air inlet pipe (52).

2. The spray tower for waste heat utilization of exhaust gas according to claim 1, characterized in that: The spray tower and the waste heat recovery tank are integrated devices, and are connected to the circulating water tank and the waste heat recovery tank through pipelines and circulating heating water pump (32).

3. The spray tower for waste heat utilization of exhaust gas according to claim 2, characterized in that: The circulating heating water pump and the spray water pump (31) are set one in front of the other, with the spray water pump inlet pipe at the bottom of the circulating water tank and the circulating heating water pump outlet pipe at the top of the circulating water tank.

4. The spray tower for waste heat utilization of exhaust gas according to claim 2, characterized in that: The waste heat recovery tank is equipped with spherical condensation pipes, the number of which is set to 4-8, and the diameter of the sphere is 1.5-2 times the pipe diameter.

5. The spray tower for waste heat utilization of exhaust gas according to claim 2, characterized in that: The direction of water flow in the spray liquid circulation heating zone inside the waste heat recovery tank is opposite to the direction of waste gas flow.

6. The spray tower for waste heat utilization of exhaust gas according to claim 4, characterized in that: The flow rate of the spray liquid in the circulating heating zone is set according to the actual exhaust gas temperature, and the flow rate range is 0.1-0.5 m / s.

7. The spray tower for waste heat utilization of exhaust gas according to claim 5, characterized in that: After being heated in the circulating heating zone, the spray liquid enters the rear of the circulating water tank through the spray liquid circulating heating pipe (42).

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