Material returning structure for steam conveying of calcium-based desulfurization by-products

Abstract

The utility model discloses a material returning structure for steam conveying calcium-based desulfurization by-products, which belongs to the field of flue gas desulfurization systems and comprises a by-product discharging pipeline, a steam pipeline, a venturi system, an adapter substitute, a by-product material returning pipeline and a main flue gas pipeline, the venturi system comprises an inlet cone section, a contraction throat pipe section and a diffusion cone section, the top of the inlet cone section is fixedly connected with the bottom of the by-product discharging pipeline, the side of the diffusion cone section is fixedly connected with the steam pipeline, the bottom of the diffusion cone section is fixedly connected with the conversion connector, a by-product returning pipeline is arranged below the conversion connector, and the by-product returning pipeline is fixedly connected with the steam pipeline. And the bottom of the by-product return pipeline is inserted into the main flue gas pipeline. Due to the arrangement of the material returning structure, the reaction activity of byproducts is improved, the desulfurization effect of the desulfurization system is enhanced, and the phenomenon that the byproducts are agglomerated and accumulated in the flowing process can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the field of flue gas desulfurization systems, in particular to a material return structure for steam-transported calcium-based desulfurization byproducts. Background Art

[0002] With the gradual tightening of national environmental protection policies, the direction of air pollution control in my country has gradually radiated from the power industry to the non-power industry, and the emission indicators of flue gas sulfur dioxide have become increasingly stringent. In view of this, my country has conducted research on a variety of desulfurization technologies, which can be mainly divided into pre-combustion desulfurization, desulfurization during combustion and post-combustion desulfurization. Among them, post-combustion desulfurization, also known as flue gas desulfurization, is the most efficient and widely used desulfurization technology.

[0003] Referring to the "a calcium-based dry desulfurization system for flue gas in the coking industry" disclosed in the Chinese patent "CN 217139940 U", the patent sets a return device to enable the by-products to be recycled in the desulfurization process, thereby increasing the utilization rate of the by-products. However, there is still a phenomenon that the recycled by-products have low reaction activity and are easy to agglomerate and accumulate. In response to this, we propose a return structure for steam-transported calcium-based desulfurization by-products. Utility Model Content

[0004] The utility model aims to provide a material return structure for conveying calcium-based desulfurization byproducts by steam in view of the shortcomings of the material return structure of the existing dry desulfurization system.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A return structure for steam-transported calcium-based desulfurization by-products, comprising a by-product discharge pipe, a steam pipe, a venturi system, a conversion joint, a by-product return pipe, and a main flue gas pipe. The venturi system comprises an inlet cone section, a contraction throat section, and a diffusion cone section. The top of the inlet cone section is fixedly connected to the bottom of the by-product discharge pipe, the side of the diffusion cone section is fixedly connected to the steam pipe, the bottom of the diffusion cone section is fixedly connected to the conversion joint, a by-product return pipe is provided below the conversion joint, and the bottom of the by-product return pipe is inserted into the main flue gas pipe.

[0007] Preferably, the conversion joint reserves a first interface, a second interface, a third interface and a fourth interface, and the first interface, the second interface, the third interface and the fourth interface are all provided with independent cover plates, and the four independent cover plates are respectively threadedly connected to the first interface, the second interface, the third interface and the fourth interface.

[0008] Preferably, there are 1 to 4 by-product return pipes.

[0009] Preferably, a semicircular opening is provided on one side of the bottom of the by-product return pipe.

[0010] Preferably, the direction of the semicircular opening is consistent with the direction of smoke flow.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] (1) In the present invention, when the calcium-based desulfurization by-products pass through the Venturi system, the negative pressure generated by the high-speed flow of the by-products draws high-temperature steam into the by-product return system, thereby heating and humidifying the by-products, greatly improving the reaction activity of the by-products and increasing the desulfurization effect of the desulfurization system.

[0013] (2) The lateral flow of the flue gas in the main flue changes the trajectory of the by-products when they enter the flue gas duct, causing the by-products to clump on the pipe wall at the bottom of the return pipe. In the utility model, a semicircular opening is provided at the bottom of the by-product return pipe in the direction consistent with the flue gas flow direction, which directly reduces the contact between the by-products and the bottom pipe wall of the return pipe, and can effectively avoid the phenomenon of agglomeration of the by-products during the flow process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of the first embodiment of the utility model;

[0015] Figure 2 This is a schematic structural diagram of a second embodiment of the present utility model;

[0016] Figure 3 This is an enlarged schematic diagram of the structure of the by-product return pipeline in the utility model;

[0017] Figure 4 It is an enlarged schematic diagram of the structure of the conversion joint in the utility model;

[0018] Figure 5 This is a schematic diagram of the connection between the conversion joint and the independent cover plate in the utility model;

[0019] In the figure: 1. by-product discharge pipe; 2. steam pipe; 3. Venturi system; 31. inlet cone section; 32. contraction throat section; 33. diffusion cone section; 4. conversion joint; 41. first interface; 42. second interface; 43. third interface; 44. fourth interface; 5. by-product return pipe; 6. by-product return pipe opening; 7. main flue gas pipe; 8. independent cover plate. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1 , Figure 4 , Figure 5 In the first embodiment of the utility model, a return structure for steam-transported calcium-based desulfurization by-products includes a by-product discharge pipe 1, a steam pipe 2, a venturi system 3, a conversion joint 4, a by-product return pipe 5, a by-product return pipe opening 6, and a main flue gas pipe 7, characterized in that the venturi system 3 includes an inlet cone section 31, a contraction throat section 32 and a diffusion cone section 33. The top of the inlet cone section 31 is fixedly connected to the bottom of the by-product discharge pipe 1, and the side of the diffusion cone section 33 is fixedly connected to the steam pipe 2. After the by-product is accelerated by the Venturi system 3, the negative pressure generated around the by-product sucks the high-temperature steam into the by-product return system, warms and humidifies the by-product, and improves the reaction activity of the by-product. The bottom 33 of the diffusion cone section is fixedly connected to the conversion joint 4, and the first interface 41 and the second interface 42 below the conversion joint 4 are respectively fixedly connected to the two by-product return pipes 5, and the third interface 43 and the fourth interface 44 below the conversion joint 4 are respectively threadedly connected to the two independent cover plates 8, and the bottom of the by-product return pipe 5 is inserted into the main flue gas pipe 7. On the one hand, the four reserved interfaces can provide redundancy. If one of the by-product return pipes 5 fails, the remaining by-product pipes 5 will operate normally, which improves the safety of production; on the other hand, the diameter of a single by-product return pipe 5 is small and the diameter of the main flue gas pipe 7 is large. The flow of a single by-product return pipe 5 will make the by-product distribution uneven, affecting the reaction rate, and the connection of multiple by-product return pipes 5 can effectively avoid this phenomenon.

[0022] See also Figure 2 , Figure 3 , Figure 4 , Figure 5In the second embodiment of the utility model, a return structure for steam-transported calcium-based desulfurization by-products includes a by-product discharge pipeline 1, a steam pipeline 2, a venturi system 3, a conversion joint 4, a by-product return pipeline 5, a by-product return pipeline opening 6, and a main flue gas pipeline 7. The venturi system 3 includes an inlet cone section 31, a contraction throat section 32, and a diffusion cone section 33. The top of the inlet cone section 31 is fixedly connected to the bottom of the by-product discharge pipeline 1, the side of the diffusion cone section 33 is fixedly connected to the steam pipeline 2, the bottom 33 of the diffusion cone section is fixedly connected to the conversion joint 4, the first interface 41 under the conversion joint 4 is fixedly connected to the by-product return pipeline 5, the second interface 42, the third interface 43 and the fourth interface 44 under the conversion joint 4 are respectively threadedly connected to three independent cover plates 8, and the bottom of the by-product return pipeline 5 is inserted into the main flue gas pipeline 7. A semicircular opening arranged at one side of the bottom of the by-product return pipe 5 and with its opening direction consistent with the flue gas flow direction, namely the by-product return pipe opening 6, increases the flowable area of ​​the by-product to a certain extent, thereby avoiding the phenomenon of by-product agglomeration and accumulation at the pipe opening.

[0023] The by-products in the desulfurization system refer to the by-products of the desulfurization process and the SO in the flue gas. 2 The substances generated after the reaction are due to the single-process desulfurization process calcium-based desulfurizer and SO 2 The reaction will not be complete, and the generated substances still contain the components and functions of the calcium-based desulfurizer. Therefore, the by-products are refluxed into the system to improve the utilization rate of the calcium-based desulfurizer, reduce the amount of calcium-based desulfurizer used, and also reduce costs.

[0024] In the utility model, the by-product enters the by-product return system from the by-product discharge pipe 1, and first increases the flow rate by the Venturi system 3 by contraction and then diffusion, and generates negative pressure in the pipe. At the same time, the high-temperature steam transported by the steam pipe 2 is sucked into the return system to humidify the by-product, thereby increasing the reaction activity of the by-product. After that, the by-product passes through the conversion joint 4 and is transported to the main flue gas pipe 7 through the by-product return pipe 5 to participate in desulfurization again. Among them, the semicircular opening arranged at one side of the bottom of the by-product return pipe 5 and the opening direction is consistent with the flue gas flow direction, that is, the by-product return pipe opening 6, increases the flowable area of ​​the by-product to a certain extent, and avoids the by-product products from agglomerating and accumulating at the pipe mouth.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A return structure for steam-transported calcium-based desulfurization by-products, comprising a by-product discharge pipe, a steam pipe, a venturi system, a conversion joint, a by-product return pipe, and a main flue gas pipe, wherein the venturi system comprises an inlet cone section, a contraction throat section, and a diffusion cone section, wherein the top of the inlet cone section is fixedly connected to the bottom of the by-product discharge pipe, the side of the diffusion cone section is fixedly connected to the steam pipe, the bottom of the diffusion cone section is fixedly connected to the conversion joint, a by-product return pipe is arranged below the conversion joint, and the bottom of the by-product return pipe is inserted into the main flue gas pipe.

2. A steam-transported calcium-based desulfurization by-product return structure according to claim 1, characterized in that: The conversion joint reserves a first interface, a second interface, a third interface and a fourth interface, and the first interface, the second interface, the third interface and the fourth interface are all provided with independent cover plates, and the four independent cover plates are respectively threadedly connected to the first interface, the second interface, the third interface and the fourth interface.

3. The return material structure of the steam-transported calcium-based desulfurization by-product according to claim 1, characterized in that: The number of the by-product return pipelines is 1 to 4.

4. The return material structure of the steam-transported calcium-based desulfurization by-product according to claim 1, characterized in that: A semicircular opening is provided on one side of the bottom of the by-product return pipe.

5. A steam-transported calcium-based desulfurization by-product return structure according to claim 4, characterized in that: The opening direction of the semicircular opening is consistent with the flow direction of the smoke.

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