Dust removal and flue gas desulfurization system of coaling and coke pushing system

Abstract

The utility model discloses a dust removal flue gas desulfurization system of a coaling coke pushing system, which comprises a desulfurization tower and a storage bin, the internal space of the desulfurization tower is sequentially divided into a humidifying cavity and a reaction cavity from bottom to top by a partition plate, an atomizing nozzle is arranged in the humidifying cavity, a plurality of vertical pipes with blocked upper ends are uniformly distributed in the reaction cavity, through holes are processed on the vertical pipes, and the through holes are communicated with the storage bin. The lower end of the vertical pipe penetrates through the partition plate and then is communicated with the humidifying cavity, the side wall of the bottom of the humidifying cavity is tangentially connected with a coal charging smoke pipe and a coke pushing smoke pipe, the top of the reaction cavity is communicated with a gas-solid separator through a pipeline, a powder discharging device is arranged at a discharging opening in the bottom of the storage bin, and a mixing pipe is arranged below the powder discharging device; the discharging end of the powder discharging device communicates with the middle of the mixing pipe, an air blower is arranged at one end of the mixing pipe, and the other end of the mixing pipe communicates with the humidifying cavity. In conclusion, the device has the advantages of high desulfurization efficiency, low operation cost and no secondary pollution.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to a dust removal flue gas desulfurization system of a coal loading and coke pushing system. Background Art

[0002] In the coking industry, coke ovens are used to carbonize and coke coal. During the coke oven's loading process, the coal contacts the hot walls of the carbonization chamber, producing a large amount of dust-laden flue gas. This flue gas contains not only dust but also impurities such as sulfur dioxide and raw coal gas. Furthermore, during the process of pushing the coke from the carbonization chamber, the hot coke contacts and burns with air, also producing a large amount of flue gas. The loading and pushing flue gas are characterized by being dispersed, large in volume, low in temperature, intermittent, and periodic. In existing technology, the loading and pushing flue gas are collected separately and then sent to a ground dust removal station for dust removal. After dust removal, they are sent to a chimney and ultimately discharged into the atmosphere. This treatment method can control the dust content in the flue gas, but it cannot remove the sulfur dioxide, resulting in significant environmental pollution. To ensure that the flue gas generated during the coke oven's loading and pushing processes meets emission standards, the dust-removed flue gas must be desulfurized. Traditional flue gas desulfurization methods primarily utilize calcium, magnesium, sodium, ammonia, and alkaline processes. When treating coal-loading and coke-pushing flue gas, these methods generally suffer from low desulfurization efficiency, high water consumption, difficulty in treating circulating water, and high operating costs. The ammonia process also often results in secondary pollution, such as ammonia escape and inability to treat wastewater. Therefore, there is an objective need to develop a dust removal flue gas desulfurization system for coal-loading and coke-pushing systems that offers high desulfurization efficiency, low operating costs, and eliminates secondary pollution. Utility Model Content

[0003] The utility model aims to provide a dust removal flue gas desulfurization system of a coal loading and coke pushing system which has high desulfurization efficiency, low operating cost and does not generate secondary pollution.

[0004] The purpose of the present utility model is achieved in this way, including a desulfurization tower and a storage silo, the internal space of the desulfurization tower is divided into a humidification chamber and a reaction chamber from bottom to top by a partition, the humidification chamber is provided with an atomizing nozzle, and a number of vertical pipes with blocked upper ends are evenly distributed in the reaction chamber, and through holes are processed on the vertical pipes. The lower ends of the vertical pipes are connected with the humidification chamber after passing through the partition, and the side walls of the bottom of the humidification chamber are tangentially connected with a coal-loading flue gas pipe and a coke-pushing flue gas pipe. The top of the reaction chamber is connected with a gas-solid separator through a pipeline, and a powder feeder is provided at the discharge port at the bottom of the storage silo, and a mixing tube is provided below the powder feeder. The discharge end of the powder feeder is connected with the middle part of the mixing tube, and a blower is provided at one end of the mixing tube, and the other end is connected with the humidification chamber.

[0005] Furthermore, a flue gas buffer tank is provided on the coal loading flue gas pipe and the coke pushing flue gas pipe respectively.

[0006] Furthermore, the solid discharge port at the bottom of the gas-solid separator is connected to a return bin, the discharge port of the return bin is connected to a screw conveyor, and the discharge port of the screw conveyor is connected to the middle of the mixing pipe.

[0007] Furthermore, a gas gathering cone with a small upper port and a large lower port is provided in the reaction chamber above the vertical tube.

[0008] Furthermore, a fan is provided in the reaction chamber above the vertical tube.

[0009] Furthermore, a spiral guide plate is provided in the mixing pipe between the blower and the discharge end of the powder feeder.

[0010] Furthermore, a plurality of inclined plates are evenly distributed on the circumference of the side wall of the reaction chamber.

[0011] When the utility model is in use, the coal-loading flue gas enters the reaction chamber from the coal-loading flue gas pipe, and the coke-pushing flue gas enters the reaction chamber from the coke-pushing flue gas pipe, and forms a vortex in the reaction chamber. At the same time, the powder feeder is started, and an appropriate amount of desulfurizer is sent to the mixing tube according to the actual conditions such as the flue gas flow rate and the sulfur dioxide content in the flue gas. The blower is started to blow air into the mixing tube. When the airflow enters the mixing tube and encounters the falling desulfurizer, it impacts the desulfurizer and disperses the desulfurizer. The desulfurizer is carried forward together with the desulfurizer, and the desulfurizer is evenly dispersed in the airflow during the flow process, carrying The airflow carrying the desulfurizer enters the humidification chamber and comes into contact with the water mist sprayed from the atomizing nozzle. The water mist humidifies the airflow, especially the powdered desulfurizer entrained in the airflow, thereby increasing the activity of the desulfurizer. The humidified airflow enters each vertical pipe respectively and is discharged from the through holes provided on each vertical pipe, where it comes into contact and collides with the flue gas in a swirling state, causing the desulfurizer in the airflow to react with acidic substances such as sulfur dioxide in the flue gas, thereby achieving the purpose of flue gas desulfurization. The desulfurized flue gas flows into the gas-solid separator from the top of the reaction chamber, and is discharged after removing the particulate matter generated by the desulfurizer and sulfur dioxide. When the present invention is in operation, it neither consumes water resources nor produces wastewater, and there is no need to treat the wastewater, so there is no problem of secondary pollution. It has the advantages of energy saving and consumption reduction, can save the cost of water resource consumption, and can also eliminate the need for wastewater treatment equipment and treatment costs, thereby reducing the construction and operation costs of the system; secondly, in the present invention, alkaline substances such as calcium hydroxide can be used as desulfurizers, which can remove sulfur dioxide from the flue gas while also generating recyclable substances such as calcium sulfate, thereby increasing corporate revenue; in addition, the desulfurizer in the present invention will be sprayed into various parts of the reaction chamber at the same time, and combined with the flue gas in a swirling state, it can ensure that the desulfurizer can be evenly mixed into the flue gas, prolonging the reaction time and flow path of the two, ensuring that the desulfurizer can fully react with the sulfur dioxide in the flue gas, thereby improving the desulfurization efficiency of the flue gas. In summary, the present invention has the advantages of high desulfurization efficiency, low operating cost, and no secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the top view of the desulfurization tower 1 in the present invention;

[0014] In the figure: 1- desulfurization tower, 2- storage silo, 3- partition, 4- humidification chamber, 5- reaction chamber, 6- atomizing nozzle, 7- vertical pipe, 8- coal loading flue gas pipe, 9- coke pushing flue gas pipe, 10- gas-solid separator, 11- powder feeder, 12- mixing tube, 13- blower, 14- flue gas buffer tank, 15- return silo, 16- screw conveyor, 17- gas gathering cone, 18- fan, 19- spiral guide plate, 20- inclined plate. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or improvements based on the present invention fall within the scope of protection of the present invention.

[0016] like Figures 1-2 As shown, the utility model includes a desulfurization tower 1 and a storage bin 2. The flue gas completes desulfurization treatment in the desulfurization tower 1. The storage bin 2 is used to store thresher powders such as calcium hydroxide. The internal space of the desulfurization tower 1 is divided into a humidification chamber 4 and a reaction chamber 5 from bottom to top by a partition 3. An atomizing nozzle 6 is provided in the humidification chamber 4. A plurality of vertical pipes 7 with blocked upper ends are evenly distributed in the reaction chamber 5. A through hole is processed on the vertical pipe 7. The lower end of the vertical pipe 7 passes through the partition 3 and is connected to the humidification chamber 4. A coal-loading flue gas pipe 8 and a coke-pushing flue gas pipe 9 are tangentially connected to the side wall of the bottom of the humidification chamber 4. The top of the reaction chamber 5 is connected to the gas pipe through a pipeline. The solid separator 10 and the gas-solid separator 10 can use existing dust removal equipment such as bag dust collectors. The discharge port at the bottom of the storage bin 2 is provided with a powder feeder 11. The powder feeder 11 is an existing technology and is used to discharge powdered materials at a constant speed and quantity. A mixing tube 12 is provided below the powder feeder 11. In the actual production process, the length of the mixing tube 12 can be appropriately extended so that there is enough time for the desulfurizer to be evenly mixed into the air flow. The discharge end of the powder feeder 11 is connected to the middle part of the mixing tube 12. A blower 13 is provided at one end of the mixing tube 12, and the other end is connected to the humidification chamber 4.

[0017] When the utility model is in use, the coal-loading flue gas enters the reaction chamber 5 from the coal-loading flue gas pipe 8, and the coke-pushing flue gas enters the reaction chamber 5 from the coke-pushing flue gas pipe 9, and forms a vortex in the reaction chamber 5. At the same time, the powder feeder 11 is started, and according to the actual conditions such as the flue gas flow rate and the sulfur dioxide content in the flue gas, an appropriate amount of desulfurizer is sent to the mixing tube 12, and the blower 13 is started to blow air inside the mixing tube 12. When the airflow enters the mixing tube 12 and encounters the falling desulfurizer, it impacts the desulfurizer, disperses the desulfurizer, and flows forward together with the desulfurizer, and makes the desulfurizer evenly dispersed in the gas during the flow process. In the flow, the air flow carrying the desulfurizer enters the humidification chamber 4 and contacts with the water mist sprayed by the atomizing nozzle 6. The water mist humidifies the air flow, especially the powdered desulfurizer entrained in the air flow, thereby improving the activity of the desulfurizer. The humidified air flow enters each vertical pipe 7 respectively and is discharged from the through holes provided on each vertical pipe 7. It contacts and collides with the flue gas in the swirling state, so that the desulfurizer in the air flow reacts with acidic substances such as sulfur dioxide in the flue gas, thereby achieving the purpose of flue gas desulfurization. The desulfurized flue gas flows into the gas-solid separator 10 from the top of the reaction chamber 5, and is discharged after removing the particulate matter generated by the desulfurizer and sulfur dioxide. When the present invention is in operation, it neither consumes water resources nor produces wastewater, does not need to treat the wastewater, and does not have the problem of secondary pollution. It has the advantages of energy saving and consumption reduction, can save the cost of water resource consumption, and can also eliminate the wastewater treatment equipment and treatment costs, thereby reducing the construction and operation costs of the system; secondly, in the present invention, alkaline substances such as calcium hydroxide can be used as desulfurizers. While removing sulfur dioxide from the flue gas, it can also generate recyclable substances such as calcium sulfate, thereby increasing corporate revenue; in addition, the desulfurizer in the present invention will be sprayed into various parts of the reaction chamber 5 at the same time, and combined with the flue gas in a swirling state, it can ensure that the desulfurizer can be evenly mixed into the flue gas, prolonging the reaction time and flow path of the two, and ensuring that the desulfurizer can fully react with the sulfur dioxide in the flue gas, thereby improving the desulfurization efficiency of the flue gas.

[0018] A flue gas buffer tank 14 is provided on the coal loading flue gas pipe 8 and the coke pushing flue gas pipe 9, respectively. Taking into account the intermittent and periodic characteristics of coal loading flue gas and coke pushing flue gas, that is, coal loading flue gas is generated when coal is loaded, and coke pushing flue gas is generated when coke is pushed, and the amount of coke pushing flue gas is larger than that of coal loading flue gas, the flue gas fed into the desulfurization tower 1 has an unstable flow problem, especially when the flue gas flow rate is large, the desulfurizer content fed into the desulfurization tower 1 may not achieve the purpose of flue gas desulfurization, and when the flue gas flow rate is small, the desulfurizer fed into the desulfurization tower 1 has an excess problem, resulting in a waste of desulfurizer. In order to avoid the above problems, the flue gas buffer tank 14 is used to store and buffer the flue gas, and output flue gas with a stable flow rate, to ensure that the flue gas can be better desulfurized without causing waste of desulfurizer.

[0019] The solid discharge port at the bottom of the gas-solid separator 10 is connected to a return bin 15, and the discharge port of the return bin 15 is connected to a screw conveyor 16. The discharge port of the screw conveyor 16 is connected to the middle of the mixing tube 12. In actual use, it is found that the flue gas discharged from the reaction chamber 5 of the desulfurization tower 1 contains a certain amount of solid particles. Part of these solid particles are generated by the reaction of the desulfurizer and sulfur dioxide, and the other part is unreacted desulfurizer. Direct discharge will cause waste of desulfurizer. In order to avoid waste, these solid particles are discharged into the return bin 15, and then quantitatively fed into the mixing tube 12 through the screw conveyor 16. After being recycled and consumed multiple times, they can be discharged. Among them, the ratio between the recycled desulfurizer and the new desulfurizer is determined according to actual needs.

[0020] A gas gathering cone 17 with a small upper port and a large lower port is provided in the reaction chamber 5 above the vertical pipe 7. The gas gathering cone 17 has the function of gathering gas. When the air flow flows out of the upper port of the gas gathering cone 17, due to the increase in the cross-sectional area of ​​the air flow, the flue gas flow will diffuse, which has the effect of stirring the flue gas, further promoting the mixing of the flue gas and sulfur dioxide, and then promoting the desulfurization reaction of the flue gas.

[0021] A fan 18 is provided in the reaction chamber 5 above the vertical pipe 7. When the flue gas flow rises, the fan 18 is driven to rotate. When the fan 8 rotates, the flue gas in the reaction chamber 5 is stirred to promote the desulfurization of the flue gas.

[0022] A spiral guide plate 19 is provided in the mixing tube 12 between the blower 13 and the discharge end of the powder feeder 11. The spiral guide plate 19 is an existing structure. When the air flow passes through the spiral guide plate 19, a vortex will be formed. On the one hand, the desulfurizer can be dispersed and mixed into the air flow more evenly. On the other hand, the vortex has better entrainment ability, which can prevent the desulfurizer from precipitating, thereby preventing the mixing tube 12 from being blocked and ensuring the normal operation of the system.

[0023] A number of inclined plates 20 are evenly distributed on the circumference of the side wall of the reaction chamber 5. In the present invention, coal-loading flue gas and coke-pushing flue gas form a vortex after entering the reaction chamber 5. When the vortex hits the inclined plate 20, on the one hand, the inclined plate 20 blocks the vortex, forcing the vortex to change its flow direction, thereby causing turbulence, promoting the contact and reaction between sulfur dioxide in the flue gas and the desulfurizer. On the other hand, the vortex will flow toward the inside of the reaction chamber 5 under the guiding action of the inclined plate 20, forcing the flue gas to quickly contact and react with the desulfurizer sprayed from the through hole of the vertical pipe 7, thereby improving the desulfurization efficiency of the flue gas.

Claims

1. A dust removal flue gas desulfurization system for a coal loading and coke pushing system, comprising a desulfurization tower (1) and a storage bin (2), characterized in that The internal space of the desulfurization tower (1) is divided into a humidification chamber (4) and a reaction chamber (5) from bottom to top by a partition (3). An atomizing nozzle (6) is arranged in the humidification chamber (4). A plurality of vertical pipes (7) with blocked upper ends are evenly distributed in the reaction chamber (5). Through holes are processed on the vertical pipes (7). The lower ends of the vertical pipes (7) pass through the partition (3) and communicate with the humidification chamber (4). A coal smoke pipe (8) is tangentially connected to the side wall of the bottom of the humidification chamber (4). and a coke pushing flue gas pipe (9); the top of the reaction chamber (5) is connected to a gas-solid separator (10) via a pipeline; a powder feeder (11) is provided at the discharge port at the bottom of the storage bin (2); a mixing tube (12) is provided below the powder feeder (11); the discharge end of the powder feeder (11) is connected to the middle of the mixing tube (12); a blower (13) is provided at one end of the mixing tube (12), and the other end is connected to the humidification chamber (4).

2. The dust removal flue gas desulfurization system of the coal loading and coke pushing system according to claim 1 is characterized in that The coal loading flue gas pipe (8) and the coke pushing flue gas pipe (9) are respectively provided with a flue gas buffer tank (14).

3. The dust removal flue gas desulfurization system of the coal loading and coke pushing system according to claim 1 is characterized in that The solid discharge port at the bottom of the gas-solid separator (10) is connected to a return bin (15), the discharge port of the return bin (15) is connected to a screw conveyor (16), and the discharge port of the screw conveyor (16) is connected to the middle of the mixing tube (12).

4. The dust removal flue gas desulfurization system of the coal loading and coke pushing system according to claim 1 is characterized in that A gas gathering cone (17) having a small upper port and a large lower port is arranged in the reaction chamber (5) above the vertical pipe (7).

5. The dust removal flue gas desulfurization system of the coal loading and coke pushing system according to claim 1, characterized in that A fan (18) is provided in the reaction chamber (5) above the vertical pipe (7).

6. The dust removal flue gas desulfurization system of the coal charging and coke pushing system according to claim 1, characterized in that A spiral guide plate (19) is provided in the mixing tube (12) between the blower (13) and the discharge end of the powder feeder (11).

7. The dust removal flue gas desulfurization system of the coal charging and coke pushing system according to claim 1, characterized in that A plurality of inclined plates (20) are evenly distributed on the circumference of the side wall of the reaction chamber (5).

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