Combined dry reaction tower

Abstract

The utility model provides a combined type dry-method reaction tower. The combined type dry-method reaction tower comprises two dry-method reaction tower bodies which are arranged in a mirror symmetry manner, each dry-method reaction tower body is sequentially divided into a dust collecting bin, a first-stage filtering bin, a second-stage filtering bin and a flue gas outlet bin from bottom to top; a flue gas inlet is formed in the side direction of each primary filtering bin; flue gas outlets are formed in the side directions of the flue gas outlet bins; the outlet end of the inlet flue is respectively connected with the two flue gas inlets; the inlet end of the outlet flue is respectively connected with the two flue gas outlets; an inlet of the circulating back-spraying device is connected with an ash discharging opening of the dust collecting bin, and an outlet of the circulating back-spraying device is connected with the inlet end of the inlet flue. According to the utility model, by adopting the two dry-method reaction towers which are arranged in a mirror symmetry manner, when one reaction tower is subjected to ash removal maintenance, the other reaction tower continues to work, so that the problem that the deacidification efficiency fluctuates greatly during the ash removal period is avoided, and the continuity and the stability of the deacidification process are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue gas purification equipment, and more specifically, particularly relates to a combined dry reaction tower. Background Technique

[0002] For those existing waste incineration projects that adopt the traditional "semi-dry method + dry method + bag filter" process, the challenge of improving the performance of their flue gas purification systems has become increasingly prominent. Specifically, there are obvious limitations in further improving the performance of the semi-dry reaction tower; while the dry process is limited by the short length of the slaked lime injection flue and insufficient reaction time, and it mainly relies on the filter layer formed on the surface of the filter bag to enhance the acid removal effect. However, during the process of bag cleaning, the dry acid removal efficiency will fluctuate greatly. In addition, considering that introducing additional wet process equipment not only has high investment costs and large operating expenses, but also has a large floor area for the equipment and limited installation space, it is not an ideal choice.

[0003] With the increase in the operation time of the project, the sharp increase in the amount of incoming waste or the additional co-incineration of sludge, industrial waste, etc. has further exacerbated the increase in the dust content in the flue gas. This not only increases the number of times of bag cleaning of the bag filter, but also accelerates the wear of the filter bag, making the need for capacity expansion of the bag filter increasingly urgent. However, the expansion and transformation project of the dust collector chamber is complex and difficult, and the cost of overall replacement is too high, and the feasibility in actual operation is relatively low.

[0004] More importantly, in order to ensure that pollutants can meet the emission standards stably in the long term, slaked lime and activated carbon are often over-injected in actual operation. This results in a large amount of unreacted slaked lime and activated carbon being mixed into the fly ash, which not only causes waste of resources, but also significantly increases the disposal cost of fly ash. Summary of the Invention

[0005] The purpose of the utility model is to provide a combined dry reaction tower to solve the problems of fluctuating acid removal efficiency caused by bag cleaning, low efficiency of filtering smoke, and difficult recycling of solid particles in the prior art.

[0006] To solve the above technical problems, the specific technical solution of a combined dry reaction tower of the utility model is as follows:

[0007] A combined dry reaction tower, characterized in that it includes:

[0008] Two dry reaction towers, the two dry reaction towers are arranged in mirror symmetry; each dry reaction tower body is sequentially divided into a dust collection chamber, a primary filtration chamber, a secondary filtration chamber and a flue gas outlet chamber from bottom to top; a flue gas inlet is provided on the side of each primary filtration chamber; a flue gas outlet is provided on the side of each flue gas outlet chamber;

[0009] An inlet flue, the outlet ends of the inlet flue are respectively connected to the two flue gas inlets

[0010] An outlet flue, the inlet ends of the outlet flue are respectively connected to the two flue gas outlets;

[0011] A circulating spray-back device, the inlet of the circulating spray-back device is connected to the ash discharge opening of the dust collection bin, and the outlet of the circulating spray-back device is connected to the inlet end of the inlet flue.

[0012] Optionally, the primary filtration bin includes a partition plate, a conical plate and an inertial separator; the partition plate and the cylinder body of the dry reaction tower form a spiral air duct; the conical plate is arranged on the partition plate; an inertial separator is arranged in the spiral air duct, and the spiral air duct communicates with the central channel formed by the partition plate.

[0013] Optionally, the inertial separator includes multiple groups of inertial separation elements, and the multiple groups of inertial separation elements are arranged in a circular array in the spiral air duct; each group of the inertial separation elements includes multiple inertial separation elements arranged radially along the cylinder body.

[0014] Optionally, multiple circles of dust collector filter bags are concentrically arranged in the secondary filtration bin, each circle of the dust collector filter bags includes multiple dust collector filter bags, and the multiple dust collector filter bags in the same circle are arranged in a circumferential array.

[0015] Optionally, a compressed air dust cleaning device is arranged at the top of the flue gas outlet bin, and the compressed air dust cleaning device includes a gas conveying component and multiple circles of concentrically arranged annular blow-back pipelines; multiple circumferentially arrayed air outlet openings are arranged on the lower surface of each blow-back pipeline, and the air outlet openings in the same circle correspond one by one to all the dust collector filter bags in the same circle below it.

[0016] Optionally, a straight pipe is connected to each of the air outlet openings of each blow-back pipeline.

[0017] Optionally, a slaked lime injection port, a circulating injection port and an activated carbon injection port are sequentially arranged in a circular shape in the inlet flue along the flue gas flow direction.

[0018] Optionally, the circulating spray-back device includes two converging screw conveyors, a buffer bin, a dust discharge screw conveyor and a spray-back assembly. The solid particles collected by the two dust collection bins are respectively conveyed to the buffer bin through the two converging screw conveyors. A dust discharge screw conveyor is provided on one side of the buffer bin, and the dust discharge screw conveyor conveys the solid particles to a curing device; a spray-back assembly is arranged at the bottom of the buffer bin, and the spray-back assembly conveys the solid particles to the inlet end of the inlet flue.

[0019] Optionally, a grinding device is installed at the bottom outlet of the buffer bin.

[0020] Optionally, a hot water or steam inlet is provided on one side of each of the converging screw conveyor, the ash discharge screw conveyor, and the backspray assembly.

[0021] The beneficial effects of the combined dry reaction tower provided by this application are as follows:

[0022] By adopting two dry reaction towers arranged in mirror symmetry, the present utility model enables one reaction tower to continue operating while the other is undergoing dust cleaning and maintenance, thus avoiding the problem of large fluctuations in the acid removal efficiency during dust cleaning and ensuring the continuity and stability of the acid removal process.

[0023] Inside each dry reaction tower of the present utility model, a primary filtration chamber and a secondary filtration chamber are separated from bottom to top, forming a two-stage dust removal structure, effectively improving the efficiency and safety of filtering smoke and solving the problem of increasing the capacity of the bag filter.

[0024] Through the setting of the circulating backspray device, the present utility model makes full use of unreacted solid particles such as hydrated lime and activated carbon. By grinding and crushing and then backspraying them into the flue, it enhances their acid removal and adsorption performance, greatly reducing the consumption of production auxiliary materials, improving the utilization rate of the medicament, and conforming to the concept of green, low-carbon, and environmental protection. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of a combined dry reaction tower of the present utility model;

[0026] Figure 2 It is Figure 1 an enlarged view of A;

[0027] Figure 3 It is Figure 1 an enlarged view of B;

[0028] Figure 4 It is a schematic diagram of the installation of the inertial separator and the partition of a combined dry reaction tower of the present utility model;

[0029] Figure 5 It is the front view of the primary filtration chamber of a combined dry reaction tower of the present utility model;

[0030] Figure 6 It is the three-dimensional view of the primary filtration chamber of a combined dry reaction tower of the present utility model;

[0031] Figure 7 It is a schematic diagram of the compressed air dust cleaning device and all the dust collector filter bags of a combined dry reaction tower of the present utility model.

[0032] Explanation of the marks in the figure:

[0033] 1. Dry reaction tower; 10. Cylinder body; 11. Dust collection bin; 111. Ash discharge port; 12. Primary filtration bin; 121. Flue gas inlet; 122. Baffle; 123. Conical plate; 124. Inertial separator; 1241. Inertial separation part; 125. Bottom plate; 13. Secondary filtration bin; 131. Dust collector filter bag; 14. Flue gas outlet bin; 141. Flue gas outlet; 142. Compressed air dust cleaning device; 1421. Gas conveying component; 1422. Reverse blowing pipeline; 1423. Air outlet; 1424. Straight pipe; 2. Inlet flue; 21. Slaked lime injection port; 22. Circulation injection port; 23. Activated carbon injection port; 3. Outlet flue; 41. Converging screw conveyor; 42. Buffer bin; 421. Grinding equipment; 43. Ash discharge screw conveyor; 44. Return spraying component; 4. Circulation return spraying device. Detailed implementation manners

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0038] As Figures 1 to 7 shown, a combined dry reaction tower provided by an embodiment of the present application includes:

[0039] Two dry reaction towers 1 are arranged in mirror symmetry; each dry reaction tower 1 is sequentially divided into a dust collection bin 11, a primary filtration bin 12, a secondary filtration bin 13, and a flue gas outlet bin 14 from bottom to top; a flue gas inlet 121 is provided on the side of each primary filtration bin 12; a flue gas outlet 141 is provided on the side of each flue gas outlet bin 14;

[0040] An inlet flue 2, the outlet ends of the inlet flue 2 are respectively connected to the two flue gas inlets 121;

[0041] An outlet flue 3, the inlet ends of the outlet flue 3 are respectively connected to the two flue gas outlets 141;

[0042] A circulating spray-back device 4, the inlet of the circulating spray-back device 4 is connected to the ash discharge port 111 of the dust collection bin 11, and the outlet of the circulating spray-back device 4 is connected to the inlet end of the inlet flue 2.

[0043] A combined dry reaction tower provided by the present utility model, compared with the prior art, by adopting two dry reaction towers 1 arranged in mirror symmetry, that is, by the way of one dry reaction tower 1 for cleaning and the other dry reaction tower 1 for working, it avoids the problem of large fluctuations in the dry desulfurization efficiency during the ash cleaning of the dry reaction tower 1. At the same time, by dividing each dry reaction tower 1 into a dust collection bin 11, a primary filtration bin 12, a secondary filtration bin 13, and a flue gas outlet bin 14 from bottom to top, the present utility model adds a two-stage dust removal structure, efficiently solves the problem of the capacity increase of the bag filter, and improves the safety of the filtered smoke reaching the standard. In addition, the circulating spray-back device 4 of the present utility model makes full use of the unreacted slaked lime and activated carbon in the solid particles, greatly reduces the consumption of production auxiliary materials, and after grinding and crushing, the coating on the surface of the solid particles is damaged, and the physical and chemical properties of the slaked lime and activated carbon are released again, and the desulfurization and adsorption performance are further enhanced, greatly reducing the consumption of production auxiliary materials, maximizing the utilization rate of the medicament, and fully meeting the concept of green, low-carbon and environmental protection.

[0044] In another embodiment of the present application, as Figures 4 to 6As shown in the figure, the primary filtration chamber 12 includes a partition plate 122, a conical plate 123, and an inertial separator 124; the partition plate 122 and the cylinder body 10 of the dry reaction tower 1 form a spiral air duct; a conical plate 123 is provided on the partition plate 122; an inertial separator 124 is provided in the spiral air duct, and the spiral air duct communicates with the central channel 124 formed within the partition plate 122. The design of the spiral air duct helps the orderly flow of air and the effective separation of particulate matter. The conical plate 123 is provided on the partition plate 122. The presence of the conical plate 123 not only enhances the rotation effect of the air flow but also promotes the collision and settlement of solid particles. More importantly, an inertial separator 124 is provided inside the spiral air duct. The inertial separator 124 utilizes the inertial differences of solid particles in the air flow to achieve the effective separation of particulate matter. When the air flow passes through the spiral air duct, the solid particles are affected by the centrifugal force, are thrown towards the wall surface of the air duct, and are then collected and settle to the dust collection chamber 11 through the central channel; the relatively clean air flow after separating the solid particles moves to the secondary filtration chamber 13 through the central channel.

[0045] Furthermore, as Figure 6 shown, both the partition plate 122 and the inertial separator 124 are provided at the bottom plate 125, and the edge of the bottom plate 125 is connected to the cylinder body 10, thereby separating the primary filtration chamber 12; and the middle of the bottom plate 125 is still penetrated by the central channel.

[0046] In another embodiment of the present application, as Figure 6 shown, the inertial separator 124 includes multiple groups of inertial separation members, and the multiple groups of inertial separation members are arranged in a circular array within the spiral air duct; each group of inertial separation members includes a plurality of inertial separation members 1241 arranged radially along the cylinder body 10.

[0047] In another embodiment of the present application, as Figure 6 shown, the inertial separation member 1241 has an arc plate structure. This arc plate structure not only has high strength and excellent rigidity but also can effectively utilize the inertial characteristics of particulate matter to achieve efficient particle separation. Its arc shape enables the air flow to make a moderate turn when passing through, so that the particulate matter impacts on the arc plate under the action of inertia and is effectively collected. This design not only improves the separation efficiency but also reduces the air flow resistance, further optimizing the performance of the entire dry reaction tower. In addition, to reduce the processing time, the arc plate structure can be obtained by cutting a round tube.

[0048] In another embodiment of the present application, as Figure 7 shown, the secondary filtration chamber 13 is concentrically arranged with multiple circles of dust collector filter bags. Each circle of dust collector filter bags includes a plurality of dust collector filter bags 131, and the multiple dust collector filter bags 131 in the same circle are arranged in a circumferential array.

[0049] In another embodiment of the present application, as Figure 7As shown, a compressed air cleaning device 142 is provided at the top of the smoke outlet bin 14, and the compressed air cleaning device 142 includes a gas delivery component 1421 and a plurality of concentrically arranged annular back-blowing pipes 1422; a plurality of circular array air outlets 1423 are provided on the lower surface of each back-blowing pipe 1422, and the air outlets 1423 in the same circle correspond one-to-one to all the dust collector filter bags 131 in the same circle located therebelow.

[0050] In another embodiment of the present application, Figure 7 As shown, the air outlet of each back-blowing pipeline 1422 is connected to a straight pipe 1424 .

[0051] In another embodiment of the present application, Figures 1 to 3 As shown, the inlet flue 2 is provided with a slaked lime injection port 21, a circulation injection port 22 and an activated carbon injection port 23 in a circular manner in the direction of flue gas flow.

[0052] In another embodiment of the present application, Figure 3 As shown, the circulating back-spraying device 4 includes two converging screw conveyors 41, a buffer bin 42, an ash-discharging screw conveyor 43 and a back-spraying assembly 44. The solid particles collected by the two dust collection bins 11 are respectively transported to the buffer bin 42 through the two converging screw conveyors 41. A ash-discharging screw conveyor 43 is provided on one side of the buffer bin 42. The ash-discharging screw conveyor 43 transports the solid particles to the solidifier 45. The specific process is as follows: The converging screw conveyor 41 is a key component connecting the dust collection bin and the buffer bin. They are responsible for transporting the collected solid particles to the buffer bin 42. This transportation method is not only efficient, but also can ensure the uniform distribution of particles during the transportation process, avoiding potential problems caused by particle accumulation. The buffer bin 42 is a temporary storage facility that can accommodate a certain amount of solid particles. Its design allows particles to be temporarily stored therein, waiting for subsequent processing or reuse. In addition, the buffer bin 42 is also equipped with an ash-discharging screw conveyor 43, which is used to transport solid particles to the solidifier 45 for further processing of these particles. The function of the solidifier 45 is to solidify the transported solid particles for subsequent use or disposal. The solidified particles can be used for a variety of purposes, such as being put back into the production process as raw materials, or as harmless filling materials, etc. The structure and principle of the solidifier 45 are not within the scope of protection of this application, and existing solidification devices can be used, such as by stirring and mixing and then heating to solidify, or adding existing curing agents, etc. The back-spray component 44 is another key part of the device, which is responsible for transporting the solid particles to the inlet end of the inlet 2. This process is actually a recycling process. By back-spraying the solidified particles into the flue, the dust content in the exhaust gas can be further reduced and the efficiency of exhaust gas treatment can be improved.

[0053] In another embodiment of the present application, Figure 2As shown, a grinding device 421 is installed at the bottom outlet of the buffer bin 42. The main function of the grinding device 421 is to further refine the solid particles stored in the buffer bin. The grinding device 421 reduces the particle size through physical action, increases its surface area, thereby enhancing its reactivity in subsequent process steps or improving its flowability.

[0054] In another embodiment of the present application, as Figure 3 shown, the backspray assembly 44 can adopt a blower; specifically, the function of the blower is to provide the necessary airflow power to convey the solid particles processed by the grinding device 421 from the bottom of the buffer bin 42 to the inlet end of the inlet flue 2.

[0055] In another embodiment of the present application, as Figure 2 shown, a hot water or steam inlet is provided on one side of the converging screw conveyor 41, the ash discharge screw conveyor 43, and the backspray assembly 44; for the convenience of conveying of the ash discharge screw conveyor 43, for solid particles that are prone to condensation or moisture absorption, heat mixing can prevent them from absorbing moisture or condensing during the conveying process, ensuring the quality and consistency of the particles.

[0056] It can be understood that the present utility model is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope protected by the present utility model.

Claims

1. A combined dry process reaction tower, characterized in that: include: Two dry reaction towers, the two dry reaction towers are arranged in mirror symmetry; each dry reaction tower body is divided into a dust collection bin, a primary filter bin, a secondary filter bin and a smoke outlet bin from bottom to top; a smoke inlet is provided on the side of the primary filter bin; a smoke outlet is provided on the side of the smoke outlet bin; An inlet flue, the outlet ends of which are respectively connected to the two flue gas inlets; An outlet flue, the inlet end of which is connected to the two flue gas outlets respectively; A circulating back-spray device, wherein the inlet of the circulating back-spray device is connected to the ash outlet of the dust collecting bin, and the outlet of the circulating back-spray device is connected to the inlet end of the inlet flue.

2. The combined dry process reaction tower according to claim 1, characterized in that: The first-stage filter bin includes a partition, a conical plate and an inertial separator; the partition and the cylinder of the dry reaction tower form a spiral airway; the conical plate is arranged on the partition; the inertial separator is arranged in the spiral airway, and the spiral airway is connected to the central channel formed by the partition.

3. The combined dry process reaction tower according to claim 2, characterized in that: The inertial separator comprises a plurality of groups of inertial separators, which are arranged in a circular array in the spiral airway; each group of the inertial separators comprises a plurality of inertial separators arranged along the radial direction of the cylinder.

4. The combined dry process reaction tower according to claim 1, characterized in that: The secondary filter bin is concentrically arranged with multiple circles of dust collector filter bags, each circle of the dust collector filter bags includes multiple dust collector filter bags, and the multiple dust collector filter bags in the same circle are arranged in a circular array.

5. The combined dry process reaction tower according to claim 1, characterized in that: A compressed air cleaning device is arranged on the top of the smoke outlet bin, and the compressed air cleaning device includes a gas delivery component and a plurality of concentrically arranged annular back-blowing pipelines; a plurality of circular array air outlets are arranged on the lower surface of each back-blowing pipeline, and the air outlets in the same circle correspond one-to-one to all the dust collector filter bags in the same circle below.

6. The combined dry process reaction tower according to claim 5, characterized in that: The air outlet of each back-blowing pipeline is connected to a straight pipe.

7. The combined dry process reaction tower according to claim 1, characterized in that: The inlet flue is circularly provided with slaked lime injection ports, circulation injection ports and activated carbon injection ports in sequence according to the flue gas flow direction.

8. The combined dry process reaction tower according to claim 1, characterized in that: The circulating back-spray device includes two converging screw conveyors, a buffer bin, an ash discharge screw conveyor and a back-spray assembly. The solid particles collected by the two dust collection bins are respectively conveyed to the buffer bins through the two converging screw conveyors. One side of the buffer bin is provided with the ash discharge screw conveyor, and the ash discharge screw conveyor conveys the solid particles to the solidifier; a back-spray assembly is provided at the bottom of the buffer bin, and the back-spray assembly conveys the solid particles to the inlet end of the inlet flue.

9. The combined dry process reaction tower according to claim 8, characterized in that: A grinding device is installed at the bottom outlet of the buffer bin.

10. The combined dry process reaction tower according to claim 8, characterized in that: One side of the merging screw conveyor, the ash discharging screw conveyor and the back-spraying component is provided with a hot water or steam inlet.

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