Spraying structure of quenching section of desulfurizing tower

Abstract

The utility model provides a spraying structure of a quenching section of a desulfurizing tower, and aims to solve the problems that in the prior art, a lattice structure of the quenching section is complicated, and a nozzle is easy to crystallize and break, so that the operation is unstable. The structure comprises a spraying header pipe arranged outside a flue of the desulfurizing tower and used for supplying emergency cold water to the desulfurizing tower; the at least one branch pipeline is led out from the spraying header pipe and is directly connected to the nozzles outside the flue, so that the internal layout is simplified; and the nozzles are arranged in the flue and at the ports of the branch pipelines. According to the utility model, the complexity of a well lattice structure is effectively avoided, the risks of nozzle crystallization and breakage are reduced, and meanwhile, chilled water is prevented from flowing back to a flue, so that the stable operation of the desulfurizing tower is ensured, the overall safety and reliability of a system are improved, and the working environment in the desulfurizing tower is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of flue gas desulfurization technology, specifically a spray structure for the quench section of a desulfurization tower. Background Technology

[0002] In the current field of industrial flue gas treatment, desulfurization towers, as important environmental protection equipment, are widely used to remove harmful substances such as sulfur dioxide from flue gas. The water-gas desulfurization tower used in Shanghai Petrochemical's No. 3 olefin complex is a typical example of using alkaline solution wet desulfurization technology. However, during the operation of the desulfurization tower, especially in its quench section, there are some technical problems that urgently need to be solved.

[0003] Traditional desulfurization towers often employ a grid-structured spray pipeline arrangement in the quench section. While this design achieves a certain level of spraying effect, it has several drawbacks. First, the grid structure results in a complex network of spray pipelines within the flue, increasing installation and maintenance difficulty and potentially causing uneven spraying, thus affecting desulfurization efficiency. Second, solid particles from the flue gas tend to accumulate around the grid and nozzles. Over time, these particles can crystallize, leading to nozzle blockage or breakage. This, in turn, affects the normal flow direction of the quench water and can even cause backflow into the flue, seriously threatening the normal operation and safe production of the desulfurization tower.

[0004] While some improvements have been attempted in response to the aforementioned problems, most have failed to fundamentally solve key issues such as the complex grid structure and the susceptibility of nozzles to crystallization and breakage. Therefore, developing a novel spray structure for the quench section of a desulfurization tower to simplify spray pipeline layout, enhance nozzle anti-crystallization capabilities, and improve spray efficiency and system stability has become a crucial issue urgently needing to be addressed in the field of flue gas desulfurization technology. Utility Model Content

[0005] This utility model provides a spray structure for the quench section of a desulfurization tower. By eliminating the original crisscrossing spray pipeline layout inside the flue and replacing it with a branch of the main spray pipe outside the flue, and inserting the nozzles directly from outside the flue, it not only simplifies the structure of the spray system, but also avoids the maintenance and repair difficulties caused by the complex pipeline layout inside the flue. It also solves the problems of the grid structure in the quench section and the easy crystallization and breakage of the nozzles affecting the normal operation of the desulfurization tower.

[0006] The technical solution of this utility model is as follows:

[0007] A spray structure for the quench section of a desulfurization tower, characterized in that it includes:

[0008] The main spray pipe, located outside the flue of the desulfurization tower, is used to supply quench water; taking into account flow and pressure requirements, it ensures that quench water can be stably and continuously supplied to each branch pipeline.

[0009] At least one branch line, which is led out from the spray main and directly connected to the nozzle outside the flue;

[0010] The nozzles are installed inside the flue at the ports of each of the branch lines.

[0011] Furthermore, when the main spray pipe is branched outside the flue, ensure that the length of each branch pipe is appropriate so as to adjust the spray pressure and flow rate of each nozzle and make the water mist evenly cover the entire quench section flue.

[0012] Furthermore, when the main spray pipe is branched outside the flue, the length of each branch pipe is 800mm.

[0013] Furthermore, the arrangement and angle of the nozzles have been optimized to ensure that the quenching water mist can completely cover the flue gas in the flue, while reducing the contact between the water mist and the flue wall, thus reducing the risk of ash accumulation and crystallization.

[0014] Furthermore, the nozzles are evenly distributed inside the quench section, and the nozzle angle is 60°.

[0015] Furthermore, the nozzle adopts a high-flow-rate nozzle design and reduces the number of nozzles, which not only increases the flow channel area of ​​the nozzle and improves the spray flow rate, but also effectively prevents the problems of nozzle crystallization and clogging.

[0016] Furthermore, the nozzle is inserted from outside the flue through the flue wall into the inside of the flue for installation and fixation.

[0017] Furthermore, the spray structure of the quench section of the desulfurization tower also includes a pressure control device for monitoring and adjusting the pressure of the main spray pipe and each branch pipe, as well as the spray flow rate of each nozzle, to ensure the uniform distribution of water mist and maintain the temperature of the flue gas at the outlet of the quench section of the desulfurization tower within a preset range.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1) By adjusting the arrangement of the spray pipeline and the design of the nozzles, this utility model effectively solves the problems of easy crystallization and breakage of the nozzles and backflow of quench water into the flue caused by the grid structure, thus ensuring the normal operation of the desulfurization tower.

[0020] 2) The main spray pipe branches outside the flue, and the nozzles are inserted directly from outside the flue to avoid splitting inside the flue and increase the flow area of ​​the flue gas.

[0021] 3) Select nozzles with high flow rates to reduce the number of nozzles required. Larger nozzle flow channels and higher flow rates help prevent crystallization. Increasing the nozzle flow area reduces the accumulation of solid particles in the flue gas and nozzle clogging. Attached Figure Description

[0022] Figure 1 This is the layout diagram of the desulfurization tower quench spray pipeline before the renovation.

[0023] Figure 2 This is an embodiment of the spray structure of the rapid cooling section of the desulfurization tower and a diagram of the spray pipeline layout. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model. Experimental methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or as recommended by the manufacturer.

[0026] Please see Figure 2 , Figure 2This is an embodiment of the spray structure and pipeline layout of the quench section of a desulfurization tower, as shown in the figure. The spray structure includes a main spray pipe 1 located outside the flue of the desulfurization tower, responsible for supplying quench water. Its design considers flow and pressure requirements to ensure a stable and continuous supply of quench water to each branch pipeline. In this embodiment, six branch pipelines extend from the main spray pipe and connect directly to nozzles 3 outside the flue. The lengths of the branch pipelines are precisely calculated to ensure that the spray pressure and flow rate of each nozzle can be adjusted to the optimal state, thereby achieving uniform distribution of water mist throughout the quench section flue. Preferably, the length of each branch pipeline is 800mm, a length that has been proven in practice to effectively balance spray pressure and flow rate. Nozzles 3 are installed inside the flue, at the ends of each branch pipeline. The arrangement and angle of the nozzles are optimized to ensure that the quench water mist completely covers the flue gas inside the flue, while minimizing contact between the water mist and the flue wall, thereby reducing the risk of ash accumulation and crystallization. The nozzles are evenly distributed within the quenching section, and the preferred nozzle angle is 60°, which effectively achieves uniform diffusion and coverage of the water mist. Furthermore, the nozzles employ a high-flow-rate design to improve spraying efficiency. The nozzles are installed and fixed inside the flue by being inserted through the flue wall from the outside, facilitating future maintenance and replacement. A pressure control device is used to monitor and adjust the pressure of the main spray pipe and each branch pipe, as well as the spray flow rate of each nozzle. Real-time monitoring and adjustment ensure uniform distribution of the water mist and maintain the temperature of the flue gas at the outlet of the desulfurization tower's quenching section within a preset range, thereby ensuring the stable operation of the desulfurization tower's quenching section. This embodiment achieves smooth connection between pipelines and ensures efficient fluid entry and exit from the desulfurization tower, realizing the function of quenching spraying. In this embodiment, the diameter of the main spray pipe is 200mm, and the diameter of branch pipe 2 is 80mm.

[0027] Application Examples:

[0028] To illustrate the advantages and practical application effects of the spray structure in the quench section of the desulfurization tower of this invention, a detailed application example is provided below.

[0029] The applicant's No. 3 olefin complex's water vapor desulfurization tower originally used a grid-structured quench section spray system (such as...). Figure 1 (As shown). However, because the spray pipelines are crisscrossed inside the flue, this not only increases the resistance to flue gas flow, but also makes it easy for crystallization to occur at the grid. The nozzles are also prone to breakage due to long-term exposure to high pressure and high temperature, which seriously affects the normal operation and production efficiency of the desulfurization tower.

[0030] The modification of the spray structure described in this utility model involves the following steps:

[0031] S1. Shutdown preparation and old structure removal:

[0032] First, disconnect the desulfurization tower from the production system to ensure shutdown and complete venting of internal flue gas, providing a safe and stable environment for subsequent modification work.

[0033] The existing grid-structured sprinkler system, including grid supports, sprinkler pipelines, and nozzles, was dismantled to ensure the smooth progress of the renovation work.

[0034] S2. Installation of spray system in the quench section of the new desulfurization tower:

[0035] Outside the flue, a new main spray pipe is installed according to the design drawings, ensuring appropriate external branching. The length and location of the branch pipes are precisely calculated to facilitate subsequent nozzle installation and spray parameter adjustment.

[0036] High-flow-rate nozzles are selected and inserted directly into the flue from the outside to the inside, according to the designed position and angle, and securely connected to the branch of the main spray pipe. The insertion depth and angle of the nozzles are carefully adjusted to ensure that the water mist can evenly cover the entire quench section flue.

[0037] After installation, system commissioning was conducted. The pressure of the main spray pipe and branch lines, as well as the spray flow rate of each nozzle, were adjusted, and the nozzle pressure was set to 0.1 MPa to ensure uniform water mist distribution and complete coverage of the quenching section flue. Simultaneously, the temperature of the flue gas at the quenching section outlet was monitored to ensure it remained within the preset range.

[0038] After commissioning, the desulfurization tower was put into trial operation, and comprehensive performance monitoring and verification were carried out. The verification results showed that the spray structure of the quench section of the modified desulfurization tower was operating well, with no nozzle breakage, and significant improvement in ash accumulation and crystallization, meeting the production process requirements.

[0039] Experiments show that by implementing the spray structure of the desulfurization tower's quench section, the problems of nozzle crystallization and breakage, and backflow of quench water in the original grid-structure spray system were successfully solved. The modified spray structure increases the flue gas flow area, improves spray efficiency, and reduces the number of nozzles and the risk of clogging. Simultaneously, by selecting nozzles with larger flow rates and a carefully designed layout, uniform water mist distribution and stable control of the flue gas temperature at the quench section outlet are ensured. After long-term operational verification, the spray structure has proven to be stable and reliable, effectively improving the operating efficiency and stability of the desulfurization tower.

Claims

1. A spray structure for the quench section of a desulfurization tower, characterized in that, include: The main spray pipe, located outside the flue of the desulfurization tower, is used to supply quench water; At least one branch line, which is led out from the spray main and directly connected to the nozzle outside the flue; The nozzles are installed inside the flue at the ports of each of the branch lines.

2. The spray structure of the quench section of the desulfurization tower according to claim 1, characterized in that, When the main spray pipe branches out outside the flue, ensure that the length of each branch pipe is appropriate so as to adjust the spray pressure and flow rate of each nozzle and make the water mist evenly cover the entire quench section flue.

3. The spray structure of the quench section of the desulfurization tower according to claim 2, characterized in that, When the main spray pipe is branched outside the flue, the length of each branch pipe is 800mm.

4. The spray structure of the quench section of the desulfurization tower according to claim 1, characterized in that, The nozzles are arranged and angled in an optimized manner to ensure that the quenching water mist can completely cover the flue gas inside the flue, while reducing the contact between the water mist and the flue wall, thus reducing the risk of ash accumulation and crystallization.

5. The spray structure of the quench section of the desulfurization tower according to claim 4, characterized in that, The nozzles are evenly distributed inside the quench section, and the nozzle angle is 60°.

6. The spray structure of the quench section of the desulfurization tower according to claim 4, characterized in that, The nozzle is designed as a high-flow-rate nozzle.

7. The spray structure of the quench section of the desulfurization tower according to claim 4, characterized in that, The nozzle is inserted into the flue from the outside through the flue wall and fixed inside the flue.

8. The spray structure for the quench section of the desulfurization tower according to any one of claims 1 to 7, characterized in that, It also includes a pressure control device for monitoring and adjusting the pressure of the main spray pipe and each branch pipe, as well as the spray flow rate of each nozzle, to ensure the uniform distribution of water mist and maintain the temperature of the flue gas at the outlet of the desulfurization tower quench section within a preset range.

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