Dry desulfurization reaction device for alkali furnace

Abstract

The utility model discloses a dry desulfurization reaction device for an alkali furnace, which comprises the alkali furnace and further comprises a desulfurization reaction device mounted on the air outlet side of the alkali furnace, and the desulfurization reaction device comprises an air inlet pipeline, a pipeline reactor, a gas-solid separation device, a supercharged multi-tube reactor, a dust remover and an air outlet pipeline which are sequentially arranged; heat preservation mechanisms are arranged outside the air inlet pipeline and the air outlet pipeline; sulfur dioxide in the flue gas of the alkali furnace is firstly separated on the cyclone separator and the electric dust removal device, so that the combustion temperature of the alkali furnace is reduced, the alkali consumption is reduced, and the desulfurization efficiency in desulfurization reaction is favorably improved; sulfur dioxide in the flue gas is removed through multiple reactions, so that the efficiency is improved; a heat preservation mechanism is arranged to prevent the flue gas temperature from decreasing too fast to affect the desulfurization effect; the flue gas treated by the supercharged multi-tube reactor is subjected to desulfurization reaction again, so that the emission of sulfur is further reduced; the dust remover can collect dust in the equipment in time, so that the equipment is kept smooth, and the influence on reaction is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of alkali furnace desulfurization technology, in particular to a dry desulfurization reaction device for an alkali furnace. Background Art

[0002] Alkali furnaces produce a large amount of flue gas with a high dust content. Direct discharge affects the environment and needs to be treated. The treatment method mostly adopts the idea of ​​"flue gas dust removal" to desulfurize the flue gas of high sulfur value alkali furnaces. At present, the SO2 removal effect of flue gas is not ideal (30-80%). There are problems such as incomplete desulfurization, high desulfurization load, easy coking of flue gas, and serious white smoke from chimneys. At the same time, emissions of smoke dust, SO2 and SO3 are still relatively high, affecting the ecological environment.

[0003] Existing dry desulfurization reaction devices have the following problems: 1) The contact time between flue gas and desulfurizer is short, the desulfurization efficiency is low, and the desulfurization effect is affected; 2) The desulfurized flue gas passes through the dust removal device, so that the dust removal device will quickly be blocked by smoke dust.

[0004] Based on this, the present invention provides a dry desulfurization reaction device for an alkali furnace, aiming to improve the above-mentioned problems. Utility Model Content

[0005] In view of the above and / or existing problems, a dry desulfurization reaction device for an alkali furnace is proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A dry desulfurization reaction device for an alkali furnace comprises an alkali furnace and a desulfurization reaction device installed on the air outlet side of the alkali furnace. The desulfurization reaction device comprises an air inlet duct, a pipeline reactor I, a gas-solid separation device I, a pipeline reactor II, a gas-solid separation device II, a pipeline reactor III, a gas-solid separation device III, a pressurized multi-tube reactor, a dust collector and an air outlet duct, which are arranged in sequence; and insulation mechanisms are provided outside the air inlet duct and the air outlet duct.

[0008] Furthermore, the insulation mechanism includes an insulation layer and a porous steel plate mesh, the insulation layer is arranged on the outside of the pipeline, and the interior of the insulation layer is a closed cavity.

[0009] Furthermore, a cyclone separator is connected to the air inlet duct, and an air outlet I is provided at the top end of the cyclone separator, and an ash outlet I is provided at the bottom end thereof.

[0010] Furthermore, an electrostatic dust removal device is provided after the cyclone separator, and the electrostatic dust removal device includes an upper air inlet I and an air outlet II, and a negative plate and an anode plate are provided inside the air inlet I and the air outlet II.

[0011] Furthermore, the pipeline reactor I, pipeline reactor II, and pipeline reactor III have the same structure and all include a tubular shell, a plurality of partitions are provided inside the tubular shell, the partitions divide the internal space of the tubular shell into multiple reaction areas, and a grid is provided inside the partition.

[0012] Furthermore, the gas-solid separation device I, gas-solid separation device II, and gas-solid separation device III have the same structure and all include a gas-solid separation tower. The gas-solid separation tower is provided with a discharge port I at the bottom, an air outlet III at the top, and a filter screen on the air outlet III.

[0013] Furthermore, the pressurized multi-tube reactor includes a tubular shell, which is composed of multiple small tubes and two large tubes. The small tubes and the large tubes are connected end to end. The upper part of the tubular shell is provided with multiple tubular gas outlet channels, and the lower part is provided with a discharge port II. The discharge port II is located on the same side, and a sandwich is formed between the two large tubes.

[0014] Furthermore, the dust collector includes a porous plate, a dust hopper I is provided at the bottom of the porous plate, an ash discharge port is provided on the ash hopper I, and a dust accumulation chamber is provided at the lower part of the ash hopper I.

[0015] Furthermore, an ash lowering funnel II is provided outside the ash lowering funnel I, a slide rail is provided on the ash lowering funnel I, and sliding blocks matching the slide rail are provided on both sides of the bottom end of the ash lowering funnel II.

[0016] Furthermore, an ash outlet and an air inlet II are provided at the bottom of the ash lowering funnel II, the ash outlet is communicated with the bottom of the ash lowering funnel II, and an ash bin is provided at the lower part.

[0017] Compared with the existing technology, it has the following advantages:

[0018] 1. The sulfur dioxide in the flue gas of this alkali furnace is first separated in the cyclone separator and the electrostatic precipitator, and most of the particles in the flue gas are removed. The dust removal treatment is carried out before the desulfurization reaction, which reduces the combustion temperature of the alkali furnace, saves alkali consumption, and is conducive to improving the desulfurization efficiency in the desulfurization reaction.

[0019] 2. Afterwards, the sulfur dioxide in the flue gas undergoes multiple reactions in the pipeline reactor I, pipeline reactor II, pipeline reactor III, and pressurized multi-tube reactor to remove the sulfur dioxide in the flue gas; then, the dust containing the reaction products is separated from the flue gas in conjunction with the gas-solid separation device I, gas-solid separation device II, gas-solid separation device III and dust collector to avoid the blockage of the pipeline by dust, thereby increasing the service life of the reactor.

[0020] 3. The invention is provided with a heat preservation mechanism to prevent the flue gas temperature from dropping too quickly and affecting the desulfurization effect. The mechanism uses a heat preservation layer to insulate the pipeline.

[0021] 4. The flue gas treated by the pressurized multi-tube reactor undergoes desulfurization reaction again to further reduce sulfur emissions. After multiple desulfurization processes, the flue gas enters the dust collector for final desulfurization treatment. In this application, the dust collector can collect dust in the equipment in a timely manner to keep the equipment unobstructed and avoid affecting the reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a simplified structural diagram of this embodiment;

[0023] Figure 2 for Figure 1 Schematic diagram of the structure of the pipeline and insulation mechanism;

[0024] Figure 3 for Figure 1 A schematic structural diagram of the middle pipeline reactor 3;

[0025] Figure 4 for Figure 1 Schematic diagram of the structure of the middle partition;

[0026] Figure 5 for Figure 1 Schematic diagram of the structure of the gas-solid separation device Ⅰ4;

[0027] Figure 6 for Figure 1 Schematic diagram of the structure of a medium-pressure multi-tube reactor;

[0028] Figure 7 for Figure 1 Schematic diagram of the structure of the dust collector. DETAILED DESCRIPTION

[0029] Below, a dry desulfurization reaction device for an alkali furnace according to the present disclosure is described in detail with reference to the accompanying drawings. In order to make the purpose, technical solutions and advantages of the present utility model clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in combination with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments.

[0030] Therefore, the following detailed description of the embodiments of the present disclosure provided in conjunction with the accompanying drawings is not intended to limit the scope of the present disclosure as claimed, but merely represents selected embodiments of the present disclosure. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present disclosure without creative effort are within the scope of protection of the present disclosure.

[0031] Unless otherwise defined in the context, the singular includes the plural; throughout the specification, the terms "including", "having", etc. are used herein to specify the existence of the stated features, numbers, steps, operations, elements, parts or their combinations, but do not preclude the existence or addition of one or more other features, numbers, steps, operations, elements, parts or their combinations.

[0032] In addition, even though terms including ordinal numbers such as "first," "second," etc. may be used to describe various components, these components are not limited by these terms, and these terms are only used to distinguish one element from other elements. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component without departing from the scope of the present disclosure.

[0033] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the disclosed product is conventionally placed when in use, or are directions or positional relationships conventionally understood by those skilled in the art. These directions or positional relationships are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present disclosure.

[0034] refer to Figure 1-Figure 7 As shown, the utility model discloses a dry desulfurization reaction device for an alkali furnace. According to one embodiment, the device comprises an alkali furnace 2 and a desulfurization reaction device installed on the air outlet side of the alkali furnace 2. The desulfurization reaction device comprises an air inlet duct 1, a pipeline reactor I3, a gas-solid separation device I4, a pipeline reactor II5, a gas-solid separation device II6, a pipeline reactor III7, a gas-solid separation device III8, a pressurized multi-tube reactor 9, a dust collector 11 and an air outlet duct 12, which are arranged in sequence; and an insulation mechanism 13 is provided outside the air inlet duct 1 and the air outlet duct 12.

[0035] In some embodiments, the insulation mechanism 13 includes an insulation layer 131 and a porous steel plate mesh 132. The insulation layer 131 is arranged on the outside of the pipe. The interior of the insulation layer 131 is a closed cavity. The closed cavity can reduce air convection and heat conduction, so that heat is more concentratedly retained therein. The porous steel plate mesh 132 also has a certain strength and can support the entire insulation layer 131. The porous design helps to increase the surface area and protect the insulation layer 131 from mechanical damage to a certain extent.

[0036] In some embodiments, the air inlet duct 1 is connected to a cyclone separator 14, which operates based on the centrifugal force generated by the rotation of the airflow. During the dry desulfurization process in the alkali furnace, the desulfurization reaction generates a certain amount of solid particulate matter (such as sulfate). When the dust-laden gas enters the cyclone separator 14, the airflow rotates at high speed along a tangential direction within the cylinder, forming a strong rotating airflow. During this rotation, the solid particulate matter, due to its large inertial centrifugal force, is thrown toward the outer wall of the cyclone separator 14 and deposited. The ash is removed from the ash outlet I 142 at the bottom, while the clean gas rises along the central axis of the separator and is ultimately discharged through the air outlet I 141 at the top.

[0037] In some embodiments, an electrostatic precipitator 15 is provided after the cyclone separator 14. The reason is that the solid particles processed by the cyclone separator 14 have a large diameter and cannot process tiny particles. Therefore, an electrostatic precipitator 15 is provided to further purify the flue gas after desulfurization, including an upper air inlet 151 and an air outlet II 152. A negative plate 153 and an anode plate 154 are provided between the air inlet 151 and the air outlet II 152. The negative plate 153 is the discharge electrode in the electrostatic precipitator 15. The surface of the negative plate 153 emits electrons under the action of a high-voltage electric field, forming a corona discharge acceleration, which reacts with the gas in the flue gas. The molecules collide and ionize to produce a large number of negative ions. The negative plate 153 has various shapes, most commonly tubular, linear or flat. It is installed at the air inlet 151 of the electrostatic precipitator 15 and collides with the dust particles in the flue gas, so that the dust particles are charged. These ions move toward the anode plate 154 under the action of the electric field; the anode plate 154 is the dust collecting electrode of the electrostatic precipitator 15. The anode plate 154 is installed downstream of the negative plate 153, that is, in the rear end area along the direction of flue gas flow. Its surface carries positive charge, which attracts and captures the negative charge emitted by the negative plate 153 and carried by the dust particles in the flue gas.

[0038] In some embodiments, the pipeline reactor I3, pipeline reactor II5, and pipeline reactor III7 have the same structure and all include a tubular shell 31. A plurality of partitions 32 are provided inside the tubular shell 31. The partitions 32 are mainly used to divide the internal space of the pipeline reactor I3 into different areas or flow channels. The partitions 32 divide the internal space of the tubular shell 31 into multiple reaction areas. A grid 321 is provided inside the partition 32, which is mainly used to support a catalyst or a filler layer such as a desulfurizer, so that the reactants can be evenly in contact with the catalyst or filler layer to improve the reaction efficiency. The design of the grid 321 can increase the contact area between the desulfurizer reactant and the catalyst, promote the improvement of the reaction rate, optimize the flow distribution of the reactants in the pipeline reactor I3, and reduce the dead zone.

[0039] The gas-solid separation device I4, gas-solid separation device II6, and gas-solid separation device III8 have the same structure, and are all provided with an air inlet and an outlet I401 at the bottom, an air outlet III402 at the top, and a filter 403 on the air outlet III402; the separation method of the gas-solid separation device is gravity sedimentation and a sedimentation plate 404, and the dust particles are deposited on the sedimentation plate 404. The air inlet is used to receive the mixed gas from the pipeline reactor, the air outlet III402 discharges the clean gas after separation, and the outlet I401 discharges the dust particles.

[0040] In some embodiments, after the reactions in the pipeline reactor I3, pipeline reactor II5, and pipeline reactor III7, and the dust removal in the gas-solid separation device I4, gas-solid separation device II6, and gas-solid separation device III8, the final reaction in the pressurized multi-tube reactor 9 is carried out to promote the desulfurization reaction by increasing the reaction pressure.

[0041] The pressurized multi-tube reactor 9 includes a tubular shell 91, which is composed of multiple small tubes 92 and two large tubes 93. The small tubes 92 and the large tubes 93 are connected end to end. The multiple small tubes 92 are filled with catalysts or desulfurization media to promote the desulfurization reaction. They have relatively small diameters, which helps to increase the contact area of ​​the reactants and improve the reaction efficiency. The large tube 93 withstands pressure and evenly distributes the pressure to the multiple small tubes 92, ensuring the smooth progress of the entire reaction process and the stable operation of the reactor.

[0042] The top of the tubular shell 91 is provided with a plurality of tubular air outlet channels 94 , and the bottom is provided with an outlet port II 95 . The outlet ports II 95 are located on the same side and take in air from the bottoms of the two large tubes 93 .

[0043] In some embodiments, the dust in the final pressurized multi-tubular reactor 9 is removed by a dust collector 11 after the reaction. The dust collector 11 is located at the end of the desulfurization reaction device and is used to collect and process dust in the gas after the reaction of the pressurized multi-tubular reactor 9.

[0044] In this dust collector 11, the porous plate 111 is the core component, which is realized by the following methods:

[0045] The porous plate 111 has evenly distributed holes, so that the gas entering the dust collector 11 is evenly distributed, and the dust particles are evenly distributed on the holes of the porous plate 111. When the dust particles are deposited to a certain extent, they fall into the ash lowering funnel I 112 at the bottom of the porous plate 111, and then enter the ash accumulation chamber 114 through the ash discharge port 113 of the ash lowering funnel I 112 for deposition; the ash lowering funnel I 112 is located at the upper part of the dust collector, and is the first contact point for dust after entering the dust collector 11. It can effectively intercept and collect dust particles from the pressurized multi-tube reactor 9 or the production process. In addition to the collection function, the ash lowering funnel I 112 also plays a certain buffering role.

[0046] In a further embodiment, an ash lower funnel II 115 is provided on the outside of the ash lower funnel I 112, a slide rail 1121 is provided on the lower ash funnel I 112, and sliders 1151 matching the slide rail 1121 are provided on both sides of the bottom end of the lower ash funnel II 115; an ash outlet 1152 and an air inlet II 1153 are provided at the bottom end of the lower ash funnel II 115, the ash outlet 1152 is communicated with the bottom of the lower ash funnel II 115, and an ash bin 1154 is provided at the lower part.

[0047] The lower ash funnel II 115 is located below the lower ash funnel I 112, and the separation and combination of the lower ash funnel II 115 and the lower ash funnel I 112 are realized by the connection between the slide rail 1121 and the slider 1151. When the lower ash funnel II 115 is separated from the lower ash funnel I 112, the dust cleaning and transportation work can be carried out conveniently, and the collected dust can be transferred to the designated treatment or recycling area; at the same time, the sliding process can cause the dust to fall into the dust particle ash bin 1154. The sliding mechanism of the slide rail 1121 and the slider 1151 can easily realize the separation and combination of the lower ash funnel I 112 and the lower ash funnel II 115, which greatly simplifies the dust cleaning and transportation process, and improves the maintenance efficiency and operation convenience of the dust collector 11.

[0048] In the embodiment of the present invention, a large amount of flue gas coming out of the alkali furnace first passes through a cyclone separator 14 and an electrostatic dust removal device 15 to remove most of the particles in the flue gas. This process is a physical dust removal process; then chemical desulfurization and dust removal are carried out, and the desulfurization reaction is carried out through a pipeline reactor I3, a pipeline reactor II5, a pipeline reactor III7 and a pressurized multi-tube reactor 9, and correspondingly passes through a gas-solid separation device I4, a gas-solid separation device II6, a gas-solid separation device III8 and a dust collector 11. Dust removal is carried out after desulfurization in each step of the reaction. Through the reasonable design and optimized configuration of the desulfurization reaction, efficient removal of sulfur dioxide in the flue gas of the alkali furnace is achieved, which can improve the dust removal efficiency and the cleanliness of the exhaust gas. The device has the advantages of simple treatment process, low energy consumption, and no wastewater discharge.

Claims

1. A dry desulfurization reaction device for an alkali furnace, comprising an alkali furnace (2), characterized in that: The invention also includes a desulfurization reaction device installed on the air outlet side of the alkali furnace (2), wherein the desulfurization reaction device includes an air inlet duct (1), a pipeline reactor I (3), a gas-solid separation device I (4), a pipeline reactor II (5), a gas-solid separation device II (6), a pipeline reactor III (7), a gas-solid separation device III (8), a pressurized multi-tube reactor (9), a dust collector (11) and an air outlet duct (12), which are arranged in sequence; and a heat preservation mechanism (13) is provided outside the air inlet duct (1) and the air outlet duct (12).

2. The dry desulfurization reaction device for an alkali furnace according to claim 1, characterized in that: The heat-insulating mechanism (13) comprises a heat-insulating layer (131) and a porous steel plate mesh (132); the heat-insulating layer (131) is arranged outside the pipeline; and the interior of the heat-insulating layer (131) is a sealed cavity.

3. The dry desulfurization reaction device for an alkali furnace according to claim 1, characterized in that: The air inlet duct (1) is connected to a cyclone separator (14), the top end of the cyclone separator (14) is provided with an air outlet I (141), and the bottom end thereof is provided with an ash outlet I (142).

4. The dry desulfurization reaction device for an alkali furnace according to claim 3, characterized in that: An electrostatic dust removal device (15) is provided after the cyclone separator (14). The electrostatic dust removal device (15) includes an upper air inlet I (151) and an air outlet II (152). A negative plate (153) and an anode plate (154) are provided inside the air inlet I (151) and the air outlet II (152).

5. The dry desulfurization reaction device for an alkali furnace according to claim 1, characterized in that: The pipeline reactor I (3), pipeline reactor II (5), and pipeline reactor III (7) have the same structure and all include a tubular shell (31). A plurality of partitions (32) are provided inside the tubular shell (31). The partitions (32) divide the internal space of the tubular shell (31) into a plurality of reaction areas. A grid (321) is provided inside the partitions (32).

6. The dry desulfurization reaction device for an alkali furnace according to claim 1, characterized in that: The gas-solid separation device I (4), the gas-solid separation device II (6), and the gas-solid separation device III (8) have the same structure and all include a gas-solid separation tower (40). The gas-solid separation tower (40) is provided with a discharge port I (401) at the bottom and an air outlet III (402) at the top, and a filter screen (403) is provided on the air outlet III (402).

7. The dry desulfurization reaction device for an alkali furnace according to claim 1, characterized in that: The pressurized multi-tube reactor (9) comprises a tubular shell (91), which is composed of a plurality of small tubes (92) and two large tubes (93). The small tubes (92) and the large tubes (93) are connected end to end. The upper part of the tubular shell (91) is provided with a plurality of tubular gas outlet channels (94), and the lower part is provided with a discharge port II (95). The discharge port II (95) is located on the same side, and a sandwich is formed between the two large tubes (93).

8. The dry desulfurization reaction device for an alkali furnace according to claim 1, characterized in that: The dust collector (11) comprises a porous plate (111), a dust collecting hopper I (112) is provided at the bottom of the porous plate (111), a dust discharge port (113) is provided on the dust collecting hopper I (112), and a dust storage chamber (114) is provided at the lower part of the dust collecting hopper I (112).

9. The dry desulfurization reaction device for an alkali furnace according to claim 8, characterized in that: An ash lowering funnel II (115) is provided outside the ash lowering funnel I (112), a slide rail (1121) is provided on the ash lowering funnel I (112), and sliding blocks (1151) matching the slide rail (1121) are provided on both sides of the bottom end of the ash lowering funnel II (115).

10. The dry desulfurization reaction device for an alkali furnace according to claim 9, characterized in that: The bottom end of the ash lowering funnel II (115) is provided with an ash outlet (1152) and an air inlet II (1153); the ash outlet (1152) is communicated with the bottom of the ash lowering funnel II (115), and an ash bin (1154) is provided at the lower part.

Images