On-line accumulated ash hardening cleaning device and countercurrent active coke desulfurization and denitrification system

Abstract

The utility model discloses an on-line dust deposition and hardening cleaning device and a countercurrent active coke desulfurization and denitrification system, the on-line dust deposition and hardening cleaning device comprises an electromagnetic valve, a pulse valve, an air bag and a blowing cleaning pipe, the pulse valve is respectively connected with the electromagnetic valve, the air bag and the blowing cleaning pipe, and the blowing cleaning pipe is connected with the pulse valve. The blowing cleaning pipe is provided with a plurality of blowing cleaning openings, the blowing cleaning openings are arranged at intervals in the length direction of the blowing cleaning pipe, and the electromagnetic valve and the pulse valve can control gas in the gas bag to be sprayed out of the blowing cleaning openings at preset time intervals. When being applied to a countercurrent active coke desulfurization and denitrification system, the device disclosed by the utility model can reduce crystallization ash deposition and hardening of the air inlet, and can effectively prevent the problem that the flue gas treatment capacity is reduced due to blockage of the air inlet of the system.

Description

Technical Field

[0001] This utility model relates to the technical field of industrial waste gas purification equipment, and further to an online ash-cleaning device and a counter-current activated coke desulfurization and denitrification system. Background Technology

[0002] With increasingly stringent environmental standards, the steel industry, as a major source of pollutants such as SO2 and NO2, considers proper treatment of sintering flue gas a crucial step towards achieving green production. Steel sintering waste gas is characterized by high dust content, high water content, numerous harmful substances, strong corrosivity, and large fluctuations in SO2 concentration. Therefore, achieving efficient pollutant removal requires selecting purification processes tailored to the characteristics of sintering flue gas.

[0003] In a counter-current bed, the fluid to be treated, i.e., flue gas, flows upward from the bottom of the bed, while the activated coke used for purification flows downward from top to bottom. This counter-current flow method is beneficial for improving mass transfer efficiency, allowing the pollutants in the fluid to come into more thorough contact with the activated coke, thereby enhancing the adsorption and catalytic reaction effects.

[0004] In the process of desulfurization and denitrification, ammonia gas is often added to help convert these pollutants into harmless or easily treatable substances using activated coke. When existing purification equipment is in use, ammonium sulfate crystals are easily formed in the gas chamber inside the device, and dust in the mixed flue gas blocks the air inlet, thereby reducing the amount of flue gas received by the device and affecting the desulfurization and denitrification effect on the flue gas.

[0005] Therefore, it is necessary to design an online ash-cleaning device and a counter-current activated coke desulfurization and denitrification system to solve the above problems. Utility Model Content

[0006] To address the aforementioned technical problems, the purpose of this utility model is to provide an online ash-cleaning device and a counter-current activated coke desulfurization and denitrification system. When applied to a counter-current activated coke desulfurization and denitrification system, it can reduce the crystallization and ash caking at the air inlet, effectively preventing the problem of reduced flue gas treatment capacity caused by blockage at the system air inlet.

[0007] To achieve the above objectives, this utility model provides an online cleaning device for accumulating ash and caking, comprising a solenoid valve, a pulse valve, an air tank, and a jet cleaning pipe. The pulse valve is connected to the solenoid valve, the air tank, and the jet cleaning pipe. The jet cleaning pipe is provided with a plurality of jet cleaning ports, which are arranged at intervals along the length of the jet cleaning pipe. The solenoid valve and the pulse valve can control the gas in the air tank to be ejected from the plurality of jet cleaning ports at preset intervals.

[0008] In some embodiments, the pulse valve has a first connection end, a second connection end, and a third connection end, the first connection end and the third connection end being disposed at opposite ends of the pulse valve, the second connection end being disposed on one side of the pulse valve, the first connection end being connected to the solenoid valve, the second connection end being connected to the air manifold, and the third connection end being connected to the jet cleaning pipe.

[0009] In some embodiments, the gas chamber contains compressed nitrogen gas, and the pressure inside the gas chamber is 0.4-0.6 MPa.

[0010] In some embodiments, the blow-through cleaning pipe extends a predetermined distance away from the pulse valve;

[0011] Several of the jet cleaning ports are arranged at equal intervals along the length of the jet cleaning pipe.

[0012] In some embodiments, a plurality of the blow-cleaning ports are arranged in at least one row of blow-cleaning port groups, wherein the blow-cleaning ports in each row of the blow-cleaning port groups have the same orientation, and the blow-cleaning ports in different rows of the blow-cleaning port groups have different orientations.

[0013] In some embodiments, the blow-cleaning pipe is a 306L stainless steel pipe.

[0014] In some implementations, it also includes:

[0015] A heating component is disposed at the gas reservoir and is used to heat the gas inside the gas reservoir to a preset temperature.

[0016] In some embodiments, at least one air tank is provided, and the solenoid valve, the pulse valve, and the jet cleaning pipe are connected in sequence to form a jet cleaning group. Multiple jet cleaning groups are provided, and each air tank is connected to multiple jet cleaning groups respectively.

[0017] According to another aspect of the present invention, the present invention further provides a countercurrent activated coke desulfurization and denitrification system, including an online ash caking cleaning device as described in any one of the above, and further including:

[0018] The desulfurization and denitrification tower is equipped with an ammonia injection chamber and a denitrification transition chamber. The solenoid valve, the pulse valve, and the gas manifold are located outside the desulfurization and denitrification tower. The blow-through cleaning pipe passes through the ammonia injection chamber and extends into the interior of the denitrification transition chamber, and is located above the air inlet of the triangular top at the lower end of the distributor of the denitrification transition chamber.

[0019] In some embodiments, the gas tank contains compressed nitrogen, and the gas tank is equipped with a heating component for heating the nitrogen in the gas tank to a preset temperature.

[0020] When the temperature of the denitrification bed in the desulfurization and denitrification tower exceeds the preset temperature, the solenoid valve and the pulse valve can control the nitrogen in the gas tank to be continuously sprayed out from several of the blowing and cleaning ports to cool down the denitrification bed in the desulfurization and denitrification tower.

[0021] Compared with existing technologies, the online ash compaction cleaning device and counter-current activated coke desulfurization and denitrification system provided by this utility model have the following beneficial effects:

[0022] In this invention, when applied to a countercurrent activated coke desulfurization and denitrification system, an online ash-cleaning device is used to purge the ammonia-flue gas mixing chamber (i.e., the denitrification transition chamber) to the denitrification bed inlet during system operation. This prevents the accumulation of ammonium sulfate crystals at this location, avoiding the situation where increased system resistance due to inlet blockage leads to poor flue gas flow and forced shutdown and premature maintenance. As a result, the permeability of the device is guaranteed, the operating cycle is extended, and the purification efficiency is improved.

[0023] At the same time, it avoids the original manual cleaning work by maintenance personnel, reduces manpower and time spent on maintenance and cleaning, and avoids the safety hazards of manual cleaning in confined spaces. Attached Figure Description

[0024] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of this utility model.

[0025] Figure 1 This is a schematic diagram of the structure of the preferred embodiment of the online cleaning device for ash and caking of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of a preferred embodiment of the countercurrent activated coke desulfurization and denitrification system of this utility model;

[0027] Figure 3 This is a partial structural schematic diagram of a preferred embodiment of the countercurrent activated coke desulfurization and denitrification system of this utility model.

[0028] Explanation of icon numbers:

[0029] Solenoid valve 1, pulse valve 2, first connection end 21, second connection end 22, third connection end 23, air manifold 3, jet cleaning pipe 4, jet cleaning port 41, desulfurization and denitrification tower 5, ammonia injection chamber 51, denitrification transition chamber 52, distributor 521, activated coke 522, flue gas 523, crystallization 524. Detailed Implementation

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0031] To keep the drawings concise, each figure only schematically shows the parts relevant to the utility model, and these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0032] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0033] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] In one embodiment, refer to the appendix to the specification. Figure 1 The present invention provides an online cleaning device for ash accumulation and caking, comprising a solenoid valve 1, a pulse valve 2, an air tank 3, and a jet cleaning pipe 4. The pulse valve 2 is connected to the solenoid valve 1, the air tank 3, and the jet cleaning pipe 4. The jet cleaning pipe 4 is provided with a plurality of jet cleaning ports 41, which are arranged at intervals along the length of the jet cleaning pipe 4. The solenoid valve 1 and the pulse valve 2 can control the gas in the air tank 3 to be ejected from the plurality of jet cleaning ports 41 at preset intervals.

[0036] Specifically, the solenoid valve 1, as a control component, can also be configured as other devices with control functions. The solenoid valve 1, combined with the pulse valve 2, can automatically spray and clean online at set times, which can effectively prevent the accumulation of ammonium sulfate crystals and avoid the increase in system resistance caused by the blockage of the air inlet, resulting in poor flue gas flow.

[0037] The pulse valve 2 has a first connecting end 21, a second connecting end 22 and a third connecting end 23. The first connecting end 21 and the third connecting end 23 are located at opposite ends of the pulse valve 2, and the second connecting end 22 is located on one side of the pulse valve 2. The first connecting end 21 is connected to the solenoid valve 1, the second connecting end 23 is connected to the air manifold 3, and the third connecting end 23 is connected to the jet cleaning pipe 4.

[0038] The air tank 3 contains compressed nitrogen gas, and the pressure inside the air tank 3 is 0.4-0.6 MPa, preferably 0.5 MPa. The compressed nitrogen gas inside the air tank 3, controlled by the solenoid valve 1 and the pulse valve 2, can be instantly ejected from the spray cleaning port 41 of the spray cleaning pipe 4. Because it is pulse spraying, the amount of nitrogen gas sprayed at one time is very small, and one air tank 3 can realize multiple spray cleaning of multiple spray cleaning pipes 4.

[0039] The jet cleaning pipe 4 extends a predetermined distance away from the pulse valve 2, and several jet cleaning ports 41 are arranged at equal intervals along the length of the jet cleaning pipe 4. The specific length of the jet cleaning pipe 4 can be set according to actual needs, allowing it to extend into the interior of the system. The jet cleaning pipe 4 is made of 306L stainless steel, enabling it to withstand the complex operating environment inside the tower and improving its service life.

[0040] Several cleaning nozzles 41 are arranged in at least one row of cleaning nozzle groups. The cleaning nozzles 41 in each row of cleaning nozzle groups face the same direction, while the cleaning nozzles 41 in different rows of cleaning nozzle groups face different directions. The cleaning nozzles 41 in different rows can be arranged in an alternating manner. By setting multiple rows of cleaning nozzles 41 with different orientations in the cleaning pipe 4, the cleaning pipe 4 can perform cleaning of different locations within the tower.

[0041] Furthermore, the online ash-accumulation cleaning device also includes a heating component, which is located at the gas reservoir 3 and used to heat the gas inside the gas reservoir 3 to a preset temperature. For example, the heating component is an electric heater, and the gas reservoir 3 contains compressed nitrogen at 0.5 MPa. The electric heater can heat the nitrogen inside the gas reservoir 3 to 60°C. If the denitrification bed overheats (i.e., the activated coke temperature in the denitrification layer rises abnormally), the online ash-accumulation cleaning device located in the transition gas chamber can be controlled to directly and continuously inject nitrogen into the layer, preventing fire hazards caused by abnormal temperature rise of the activated coke in the module.

[0042] Furthermore, at least one air tank 3 is provided, and the solenoid valve 1, pulse valve 2 and jet cleaning pipe 4 are connected in sequence to form a jet cleaning group. Multiple jet cleaning groups are provided, and each air tank 3 is connected to multiple jet cleaning groups respectively.

[0043] For example, when applying an online ash caking removal device to a countercurrent activated coke desulfurization and denitrification system, the number of such devices required for a single system depends on the number of adsorption modules designed into the system. Each adsorption module requires one set of online ash caking removal devices. A single set of these devices can be configured to include one air tank 3, ten solenoid valves 1, ten pulse valves 2, and ten jet cleaning pipes 4. The air tank 3 provides 0.5 MPa nitrogen gas to the ten sets of jet cleaning pipes 4 for jet cleaning. The ten sets of solenoid valves 1 and pulse valves 2 are used for control, with each set opening alternately at 10-second intervals. This ensures the cleanliness of the air inlet and prevents the flue gas to be treated from experiencing a decrease in purification efficiency due to poor airflow caused by crystallization and blockage of the air inlet during the denitrification process.

[0044] According to another aspect of this utility model, reference is made to the appended specification. Figure 2 , Figure 3 This utility model further provides a countercurrent activated coke desulfurization and denitrification system, including an online ash and caking cleaning device as described in any one of the above, and also includes: a desulfurization and denitrification tower 5, which is provided with an ammonia injection chamber 51 and a denitrification transition chamber 52. A solenoid valve 1, a pulse valve 2, and an air manifold 3 are provided outside the desulfurization and denitrification tower 5. A blow-through cleaning pipe 4 passes through the ammonia injection chamber 51 and extends into the interior of the denitrification transition chamber 52, and is located above the air inlet of the triangular top at the lower end of the distributor 521 of the denitrification transition chamber 52.

[0045] In the counter-current bed of the desulfurization and denitrification tower 5, the fluid to be treated, i.e., flue gas 53, flows upward from the bottom of the bed, while the purification medium, activated coke 522, flows downward from top to bottom. This counter-current flow method is beneficial to improving mass transfer efficiency, allowing pollutants in the fluid to come into more thorough contact with the activated coke 522, thereby improving the adsorption and catalytic reaction effects. However, the current counter-current bed activated coke desulfurization and denitrification technology device does not have an online anti-crystallization and crystallization cleaning device. To address this recurring crystallization problem, the method used is to partially shut down the operation, removing it from the production line, and having workers manually clean it inside the tower offline.

[0046] In this embodiment, the solenoid valve 1, pulse valve 2, and air tank 3 are all located outside the tower for easy equipment maintenance and to avoid the high-temperature environment inside the tower affecting the service life of the components. The jet cleaning pipe 4 is installed above the air inlet of the triangular apex at the lower end of the distributor 521 in the denitrification transition gas chamber 52. The jet cleaning pipe 4 has jet cleaning ports 41 with alternating 50 cm intervals on both sides of the air inlet direction. The online ash accumulation cleaning device uses 0.5 MPa nitrogen gas controlled by the solenoid valve 1 and pulse valve 2 to intermittently spray the air inlets that are prone to crystallization and blockage, ensuring the cleanliness of the air inlets and preventing the flue gas to be treated from being blocked by crystallization during the denitrification process, which would lead to a decrease in purification efficiency.

[0047] By using an online ash-cleaning device, the mixing chamber of ammonia and flue gas (i.e., the denitrification transition chamber) to the inlet of the denitrification bed is purged online during system operation. This prevents the accumulation of ammonium sulfate crystals at this location, avoiding the situation where increased system resistance due to inlet blockage leads to poor flue gas flow and forced shutdown and premature maintenance. As a result, the permeability of the device is guaranteed, the operating cycle is extended, and the purification efficiency is improved.

[0048] At the same time, it avoids the original manual cleaning work by maintenance personnel, reduces manpower and time spent on maintenance and cleaning, and avoids the safety hazards of manual cleaning in confined spaces.

[0049] Furthermore, compressed nitrogen is installed inside the gas tank 3, and a heating component is installed at the gas tank 3 to heat the nitrogen inside the gas tank 3 to a preset temperature; when the temperature of the denitrification bed in the desulfurization and denitrification tower 5 exceeds the preset temperature, the solenoid valve 1 and the pulse valve 2 can control the nitrogen in the gas tank 3 to be continuously sprayed out from several blow-out cleaning ports 41 to cool down the denitrification bed in the desulfurization and denitrification tower 5 and prevent fire hazards caused by abnormal temperature rise of activated coke in the module.

[0050] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0051] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this utility model. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. An apparatus for online cleaning of dust accretion, characterized in that, The device includes a solenoid valve, a pulse valve, an air tank, and a jet cleaning pipe. The pulse valve is connected to the solenoid valve, the air tank, and the jet cleaning pipe. The jet cleaning pipe has several jet cleaning ports, which are arranged at intervals along the length of the jet cleaning pipe. The solenoid valve and the pulse valve can control the gas in the air tank to be ejected from the several jet cleaning ports at preset intervals.

2. The online ash-accumulation cleaning device according to claim 1, characterized in that, The pulse valve has a first connection end, a second connection end, and a third connection end. The first connection end and the third connection end are located at opposite ends of the pulse valve, and the second connection end is located on one side of the pulse valve. The first connection end is connected to the solenoid valve, the second connection end is connected to the air manifold, and the third connection end is connected to the jet cleaning pipe.

3. The online ash-accumulation cleaning device according to claim 1, characterized in that, The gas chamber contains compressed nitrogen gas, and the pressure inside the gas chamber is 0.4-0.6 MPa.

4. The online ash-accumulation cleaning device according to claim 1, characterized in that, The jet cleaning pipe extends a predetermined distance away from the pulse valve; Several of the jet cleaning ports are arranged at equal intervals along the length of the jet cleaning pipe.

5. The online dust accumulation and caking device according to claim 4, characterized in that, The plurality of the blow-cleaning ports are arranged in at least one row of blow-cleaning port groups, wherein the blow-cleaning ports in each row of the blow-cleaning port groups have the same orientation, and the blow-cleaning ports in different rows of the blow-cleaning port groups have different orientations.

6. The online ash-accumulation cleaning device according to claim 1, characterized in that, The blow-through cleaning pipe is made of 306L stainless steel.

7. The online soot buildup cleaning apparatus of claim 1, wherein, Also includes: A heating component is disposed at the gas reservoir and is used to heat the gas inside the gas reservoir to a preset temperature.

8. The online cleaning device for ash accumulation and caking according to any one of claims 1-7, characterized in that, At least one air tank is provided. The solenoid valve, the pulse valve, and the jet cleaning pipe are connected in sequence to form a jet cleaning group. Multiple jet cleaning groups are provided, and each air tank is connected to multiple jet cleaning groups respectively.

9. A system for desulfurization and denitrification of flue gas by countercurrent activated coke, characterized in that, The online ash-accumulation cleaning device as described in any one of claims 1-8 further includes: The desulfurization and denitrification tower is equipped with an ammonia injection chamber and a denitrification transition chamber. The solenoid valve, the pulse valve, and the gas manifold are located outside the desulfurization and denitrification tower. The blow-through cleaning pipe passes through the ammonia injection chamber and extends into the interior of the denitrification transition chamber, and is located above the air inlet of the triangular top at the lower end of the distributor of the denitrification transition chamber.

10. The countercurrent activated coke desulfurization and denitrification system according to claim 9, characterized in that, The gas tank contains compressed nitrogen, and a heating component is provided at the gas tank to heat the nitrogen in the gas tank to a preset temperature. When the temperature of the denitration bed in the desulfurization and denitration tower exceeds the preset temperature, the electromagnetic valve and the pulse valve can control the nitrogen in the gas pocket to continuously spray from the several blow cleaning ports to cool the denitration bed in the desulfurization and denitration tower.

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