Coke oven flue gas desulfurization device

Abstract

The utility model discloses a coke oven flue gas desulfurization device, which relates to the technical field of coke oven flue gas desulfurization and comprises a desulfurization kettle, the desulfurization kettle is fixedly connected with an exhaust pipe and a liquid conveying pipe, and the bottom of the desulfurization kettle is fixedly connected with a blow-off pipe. The device further comprises a pre-cleaning mechanism used for removing dust particles in flue gas and a flue gas washing assembly used for increasing the contact area of the flue gas and alkali liquor. When the device is used, flue gas needing to be conveyed to the gas conveying pipe, the stirring device fully stirs and mixes the flue gas and water, solid particles in the flue gas are removed through the water, the solid particles can be gathered in the middle of the bottom of the stirring barrel under the action of rotating water flow, precipitates are formed after the solid particles are accumulated to a certain degree, and the solid particles are separated from the stirring barrel. And by inputting high-pressure water flow into the flushing water pipe, precipitated particles can be flushed away, so that the pollution discharge effect is realized, solid particles in the flue gas are cleaned, and the influence of the solid particles in the flue gas on subsequent operation is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to coke oven flue gas desulfurization technical field, concretely relates to a coke oven flue gas desulfurization device. BACKGROUND

[0002] Coke oven flue gas desulfurization refers to the process of removing sulfur oxides (mainly SO2) from coke oven flue gas or other industrial waste gas. Coke oven flue gas is the waste gas generated by the combustion of coal gas in the coke oven production process, which contains a large amount of sulfur dioxide, dust and nitrogen oxides and other substances. They are one of the main pollutants that form acid rain and haze. If the coke oven flue gas is discharged without treatment, it will cause great pollution and damage to the atmospheric environment. Therefore, coke oven flue gas desulfurization is an important part of flue gas treatment in industrial manufacturing process, and it is of great significance to meet environmental protection requirements.

[0003] A coke oven flue gas desulfurization device is disclosed in Chinese patent. The working principle of the device is as follows: coke oven flue gas is connected to the desulfurization tank through the smoke inlet, and the sulfur oxides in the coke oven flue gas react with water to form sulfite and sulfate, and the sulfite and sulfate react with calcium ions in calcium hydroxide to form calcium sulfite and calcium sulfate. Since calcium sulfite and calcium sulfate are insoluble in water, sulfur oxides are desulfurized from coke oven flue gas. During the entire desulfurization operation, the reaction in the desulfurization tank is continuously stirred by the stirring device to make the reaction more complete, and the reactants are added or the reacted substances are discharged in time through the feeding port and the discharge port.

[0004] The existing technical solution has the following disadvantages: there are a large number of dust particles in the coke oven flue gas, which may react with the desulfurizing agent, consume the desulfurizing agent and reduce its desulfurization effect. At the same time, the dust particles enter the desulfurization tank and combine with water to form muddy sediment. The accumulation of these sediments not only consumes the water in the desulfurization tank, but also forces the workers to frequently carry out pollution discharge operation to maintain the normal operation of the desulfurization tank, thereby increasing the input cost and weakening the overall desulfurization effect. UTILITY MODEL CONTENT

[0005] The utility model aims to provide a coke oven flue gas desulfurization device to solve the technical problem that there are a large number of dust particles in the coke oven flue gas in the prior art, which may react with the desulfurizing agent, consume the desulfurizing agent and reduce its desulfurization effect.

[0006] The technical problem to be solved by the utility model can be realized by the following technical solutions:

[0007] The utility model relates to a kind of coke oven flue gas desulfurization device, including desulfurization kettle, exhaust pipe and liquid delivery pipe are fixedly connected on the desulfurization kettle, the bottom of the desulfurization kettle is fixedly connected with blowdown pipe, the device further includes the pre-cleaning mechanism for removing dust particles inside flue gas and the flue gas washing assembly for increasing the contact area of flue gas and lye, the pre-cleaning mechanism includes stirring drum, flushing water pipe for flushing sediment is fixedly connected on the both sides of the bottom of the stirring drum, stirring device is provided on the stirring drum, the bottom of the stirring drum is fixedly connected with gas delivery pipe, flue gas transmission assembly is cooperatively connected between the desulfurization kettle and stirring drum, driving assembly is provided on the desulfurization kettle, the flue gas washing assembly includes at least two groups of rotary disc matched with driving assembly, a plurality of air vents for gas circulation are formed on each group of rotary disc, at least two groups of baffle for reducing the flow rate of lye are fixedly connected in the desulfurization kettle and matched with rotary disc, and a plurality of scraping plates for cleaning the surface of rotary disc are fixedly connected on the bottom of each group of baffle.

[0008] As a further scheme of the utility model: the flue gas transmission assembly includes circumferential pipe around the desulfurization kettle, a plurality of flue gas nozzles are fixedly connected in the desulfurization kettle at equal intervals, each group of flue gas nozzles is communicated with circumferential pipe, and the circumferential pipe is cooperatively connected with stirring drum through connecting pipe, the highest horizontal height of the connecting pipe is greater than the liquid level of lye in the desulfurization kettle, and the circumferential pipe is arranged on the lower side of the desulfurization kettle.

[0009] As a further scheme of the utility model: the driving assembly includes motor fixedly connected with the desulfurization kettle, and transmission shaft is fixedly connected to the output end of the motor, and each group of rotary disc is coaxially fixedly connected with transmission shaft.

[0010] As a further scheme of the utility model: the bottom of the desulfurization kettle is designed as funnel shape.

[0011] As a further scheme of the utility model: the lower end of the transmission shaft is fixedly connected with stirring plate matched with the inner bottom of the desulfurization kettle, and the side surface of the stirring plate is in contact with the funnel-shaped inner wall of the inner bottom of the desulfurization kettle.

[0012] As a further scheme of the utility model: the baffle is fixedly connected with limiting sleeve, and the limiting sleeve is rotatably sleeved on the transmission shaft.

[0013] The utility model has the advantages of:

[0014] 1. The utility model discloses when using, need to the flue gas of gas pipe delivery, the stirring device fully stirs and mixes the flue gas and water, through the solid particle of water removal inside the flue gas, under the action of the water flow of rotation, solid particle will gather in the middle of stirring cylinder bottom, when solid particle accumulation reaches a certain degree after forming the deposit, through to the inside input high -pressure flow of flushing water pipe, can wash away the particle of deposit, thereby realizes the effect of pollution control, to complete the cleaning of solid particle inside the flue gas, thereby reduce the influence of solid particle inside the flue gas to subsequent operation.

[0015] 2. The utility model discloses when using, motor can drive multiple sets of rotating disc rotation through transmission shaft, and the rotating rotating disc can divide the big bubble into many small bubbles, thereby increased the contact area of flue gas and lye, through the rotation speed of part position water flow of baffle, thereby guarantee the relative speed of lye and bubble, and further improve the reaction efficiency of lye and flue gas, and each group baffle bottom is fixedly connected with multiple sets of scraper for cleaning the surface of rotating disc, and the scraper can scrape the deposit on the surface of rotating disc to the air vent inside, and the deposit can drop to the bottom through the air vent, thereby leaving the rotating disc, realize the cleaning of rotating disc. DRAWINGS

[0016] The utility model will be further described below in combination with the drawings.

[0017] Figure 1 It is the whole structure schematic diagram of the utility model;

[0018] Figure 2 It is the longitudinal section structure schematic diagram of the utility model pre -cleaning mechanism;

[0019] Figure 3 It is the longitudinal section structure schematic diagram of the utility model desulfurizer;

[0020] Figure 4 It is the structure schematic diagram of the utility model rotating disc.

[0021] In the drawing: 1, pre -cleaning mechanism;101, flushing water pipe;102, stirring cylinder;103, stirring device;104, gas pipe;2, desulfurizer;3, link pipe;4, encircle pipe;5, flue gas nozzle;6, motor;7, transmission shaft;8, rotating disc;9, air vent;10, limit sleeve;11, baffle;12, scraper;13, stirring board;14, exhaust pipe;15, blowdown pipe;16, liquid delivery pipe. SPECIFIC IMPLEMENTATION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figures 1-4 As shown, a coke oven flue gas desulfurization device includes a desulfurization kettle 2, an exhaust pipe 14 and a liquid infusion pipe 16 are fixedly connected to the desulfurization kettle 2, and a sewage pipe 15 is fixedly connected to the bottom of the desulfurization kettle 2. The gas after the desulfurization operation is discharged from the exhaust pipe 14. The liquid infusion pipe 16 is responsible for inputting sufficient alkaline solution into the desulfurization kettle 2. The sulfur oxides in the coke oven flue gas react with water to generate sulfite and sulfate. The sulfite and sulfate react with calcium ions in the alkaline solution to generate calcium sulfite and calcium sulfate. Since calcium sulfite and calcium sulfate are insoluble in water, the sulfur oxides are desulfurized from the coke oven flue gas. The sewage pipe 15 is responsible for discharging the generated precipitate.

[0024] The device also includes a pre-cleaning mechanism 1 for removing dust particles from the flue gas and a flue gas scrubbing assembly for increasing the contact area between the flue gas and the alkali solution. The pre-cleaning mechanism 1 includes a mixing drum 102, with flushing water pipes 101 fixedly connected to both sides of the bottom of the mixing drum 102 for flushing out sediment. Each flushing water pipe 101 is equipped with a valve, and one set of flushing water pipes 101 is equipped with a water pump. A stirring device 103 is provided on the mixing drum 102, and an air supply pipe 104 is fixedly connected to the bottom of the mixing drum 102. The stirring device 103 thoroughly mixes the flue gas and water transported by the air supply pipe 104, removing solid particles from the flue gas with the water. Under the action of the rotating water flow, the solid particles gather in the center of the bottom of the mixing drum 102. When the solid particles accumulate to a certain level, they form a sediment. The valves on the flushing water pipes 101 are opened to inject high-pressure water into the flushing water pipes 101, flushing away the sediment, thereby achieving a sewage discharge effect.

[0025] The flue gas transmission assembly is matched and connected between the desulfurization kettle 2 and the stirring barrel 102, and is used for realizing transmission of flue gas. The desulfurization kettle 2 is provided with a driving assembly and a flue gas washing assembly. The driving assembly comprises a motor 6 fixedly connected with the desulfurization kettle 2. The motor 6 is fixedly connected with a transmission shaft 7 at an output end. The flue gas washing assembly comprises four groups of rotating discs 8. Each group of rotating discs 8 is provided with a plurality of air vents 9 for circulating gas. Each group of rotating discs 8 is coaxially fixedly connected with the transmission shaft 7, so that the motor 6 can drive the rotating discs 8 to rotate through the transmission shaft 7. The desulfurization kettle 2 is fixedly connected with four groups of baffles 11 matched with the rotating discs 8 and used for reducing the flow rate of alkali solution. The rotating rotating discs 8 can disperse large bubbles into many small bubbles, thereby increasing the contact area of flue gas and alkali solution. However, the rotating rotating discs 8 can also generate rotating water flow in the desulfurization kettle 2, thereby weakening the convection effect of bubbles and alkali solution. The rotating speed of water flow at some positions is reduced through the baffles 11, thereby ensuring the relative speed of alkali solution and bubbles, and further improving the reaction efficiency of alkali solution and flue gas. Each group of baffles 11 is fixedly connected with a plurality of scraping plates 12 used for cleaning the surface of the rotating disc 8 at the bottom. The scraping plates 12 can scrape the deposits on the surface of the rotating disc 8 into the air vents 9. The deposits can fall to the bottom through the air vents 9, thereby leaving the rotating disc 8 and realizing cleaning of the rotating disc 8.

[0026] In order to realize the transmission of flue gas, the flue gas transmission assembly comprises a surrounding pipe 4 arranged around the desulfurization kettle 2. A plurality of groups of flue gas nozzles 5 are fixedly connected at equal intervals in the desulfurization kettle 2. Each group of flue gas nozzles 5 is in communication with the surrounding pipe 4, thereby facilitating the flue gas in the surrounding pipe 4 to enter the desulfurization kettle 2 through the flue gas nozzles 5. The surrounding pipe 4 is matched and connected with a connecting pipe 3 between the desulfurization kettle 2 and the stirring barrel 102. The highest horizontal height of the connecting pipe 3 is greater than the liquid level of the alkali solution in the desulfurization kettle 2. The surrounding pipe 4 is arranged at the lower side of the desulfurization kettle 2, thereby avoiding the backflow of alkali solution in the desulfurization kettle 2 into the stirring barrel 102.

[0027] In order to facilitate the collection of the deposits, the inner bottom of the desulfurization kettle 2 is designed in a funnel shape. The sulfides in the flue gas react with the alkali solution to generate deposits. The deposits finally fall to the inner bottom of the desulfurization kettle 2. The funnel-shaped design of the inner bottom of the desulfurization kettle 2 facilitates the collection of the deposits.

[0028] In order to reduce the maintenance difficulty, the transmission shaft 7 is fixedly connected with a stirring plate 13 matched with the inner bottom of the desulfurization kettle 2 at the lower end. The side surface of the stirring plate 13 is in contact with the funnel-shaped inner wall of the inner bottom of the desulfurization kettle 2. The deposits generated by the flue gas and the alkali solution are easy to combine with the inner wall of the desulfurization kettle 2, thereby forming a solid layer difficult to clean, increasing the maintenance difficulty. The rotation of the transmission shaft 7 drives the stirring plate 13 to rotate. The rotation of the stirring plate 13 drives the water and the deposits at the bottom of the desulfurization kettle 2 to move, thereby reducing the trend of the deposits and the inner wall of the desulfurization kettle 2 to be fixedly combined with each other, and cleaning the inner wall of the desulfurization kettle 2.

[0029] In order to ensure the stability of the rotating disc 8 in the rotating process, the limiting sleeve 10 is fixedly connected on the partition plate 11, and the limiting sleeve 10 is rotatably sleeved on the transmission shaft 7. Since the flue gas reacts with the lye to generate a precipitate, the precipitate can be fixedly combined with the rotating disc 8, so that the gravity distribution on the rotating disc 8 is unbalanced, the rotating disc 8 rotates to generate a deflection force on the transmission shaft 7, the limiting sleeve 10 can maintain the position of the transmission shaft 7, thereby ensuring the normal rotation of the rotating disc 8.

[0030] In order to facilitate the person skilled in the art to understand the embodiment of the present scheme, the working principle of the embodiment of the present scheme will be described in combination with a specific application scenario:

[0031] In use, sufficient lye is input into the inside of the desulfurization kettle 2 through the liquid inlet pipe 16, a certain amount of liquid water is injected into the inside of the stirring cylinder 102 through the flushing water pipe 101, and then the flue gas is transported to the gas inlet pipe 104, the stirring device 103 fully stirs and mixes the flue gas and water, the solid particles in the flue gas are removed through water, and under the action of the rotating water flow, the solid particles will be collected in the middle of the bottom of the stirring cylinder 102, and when the solid particles accumulate to a certain degree, a precipitate is formed, and by inputting a high-pressure water flow into the inside of the flushing water pipe 101, the precipitated particles can be washed away, thereby realizing the effect of pollution discharge.

[0032] After the flue gas is initially cleaned, it will pass through the connecting pipe 3 and the surrounding pipe 4 in turn, and finally enter the inside of the desulfurization kettle 2 from the flue gas nozzle 5, so that the flue gas is divided into many parts, thereby increasing the contact area of the flue gas and the lye.

[0033] The motor 6 can drive multiple groups of rotating discs 8 to rotate through the transmission shaft 7, the rotating rotating disc 8 can disperse large bubbles into many small bubbles, thereby increasing the contact area of the flue gas and the lye, but also causing a rotating water flow in the inside of the desulfurization kettle 2, thereby weakening the convection effect of the bubbles and the lye, the rotating speed of part of the water flow is reduced through the partition plate 11, thereby ensuring the relative speed of the lye and the bubbles, and thereby improving the reaction efficiency of the lye and the flue gas. The bottom of each partition plate 11 is fixedly connected with multiple scraping plates 12 for cleaning the surface of the rotating disc 8, the scraping plate 12 can scrape the precipitate on the surface of the rotating disc 8 into the air inlet 9, and the precipitate can fall to the bottom through the air inlet 9, thereby leaving the rotating disc 8, and realizing the cleaning of the rotating disc 8.

[0034] The precipitate generated by the flue gas and the alkali liquor is easy to combine with the inner wall of the desulfurization kettle 2, forming a solid layer which is difficult to clean, increasing the difficulty of maintenance. The rotation of the transmission shaft 7 drives the rotation of the stirring plate 13, and the rotation of the stirring plate 13 drives the movement of the water and its precipitate at the bottom of the desulfurization kettle 2, thereby reducing the tendency of the precipitate to be fixedly combined with the inner wall of the desulfurization kettle 2, and cleaning the inner wall of the desulfurization kettle 2. Since the flue gas and the alkali liquor react to generate a precipitate, the precipitate can be fixedly combined with the rotating disc 8, resulting in an unbalanced distribution of gravity on the rotating disc 8, so that the rotating disc 8 rotates to generate a deflection force on the transmission shaft 7. The limiting sleeve 10 can maintain the position of the transmission shaft 7, thereby ensuring the normal rotation of the rotating disc 8.

[0035] The above describes one embodiment of the present application in detail, but the content described is only a preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the patent coverage of the present application.

Claims

1. A coke oven flue gas desulfurization device, comprising a desulfurization kettle (2), an exhaust pipe (14) and a liquid delivery pipe (16) fixedly connected to the desulfurization kettle (2), and a sewage pipe (15) fixedly connected to the bottom of the desulfurization kettle (2), characterized in that , also includes: A pre-cleaning mechanism (1) for removing dust particles inside flue gas and a flue gas washing assembly for increasing the contact area between flue gas and alkali solution, wherein the pre-cleaning mechanism (1) comprises a mixing drum (102), both sides of the bottom of the mixing drum (102) are fixedly connected with flushing water pipes (101) for flushing sediment, a stirring device (103) is provided on the mixing drum (102), a gas transmission pipe (104) is fixedly connected to the bottom of the mixing drum (102), and the desulfurization kettle (2) and the mixing drum (102) are connected in a coordinated manner. A flue gas transmission component is connected, a driving component is provided on the desulfurization kettle (2), and the flue gas washing component includes at least two groups of rotating disks (8) matched with the driving component, and each group of the rotating disks (8) is provided with multiple groups of vents (9) for circulating gas, and at least two groups of baffles (11) matched with the rotating disks (8) and used to reduce the flow rate of the alkali solution are fixedly connected inside the desulfurization kettle (2), and the bottom of each group of the baffles (11) is fixedly connected with multiple groups of scrapers (12) for cleaning the surface of the rotating disk (8).

2. A coke oven flue gas desulfurization device according to claim 1, characterized in that: The flue gas transmission component includes a surrounding pipe (4) arranged around the desulfurization kettle (2), and a plurality of groups of flue gas nozzles (5) are fixedly connected around the inside of the desulfurization kettle (2) at equal intervals, and each group of flue gas nozzles (5) is connected to the surrounding pipe (4). A connecting pipe (3) is connected between the surrounding pipe (4) and the mixing drum (102), and the highest horizontal height of the connecting pipe (3) is greater than the alkali liquid level inside the desulfurization kettle (2). The surrounding pipe (4) is arranged on the lower side of the desulfurization kettle (2).

3. A coke oven flue gas desulfurization device according to claim 1, characterized in that: The driving assembly comprises a motor (6) fixedly connected to the desulfurization kettle (2), an output end of the motor (6) is fixedly connected to a transmission shaft (7), and each set of rotating disks (8) is coaxially fixedly connected to the transmission shaft (7).

4. A coke oven flue gas desulfurization device according to claim 1, characterized in that: The bottom of the desulfurization kettle (2) is designed to be funnel-shaped.

5. A coke oven flue gas desulfurization device according to claim 3, characterized in that: The lower end of the transmission shaft (7) is fixedly connected to a stirring plate (13) that matches the bottom of the desulfurization kettle (2), and the side of the stirring plate (13) contacts the funnel-shaped inner wall of the bottom of the desulfurization kettle (2).

6. A coke oven flue gas desulfurization device according to claim 3, characterized in that: A limiting sleeve (10) is fixedly connected to the partition (11), and the limiting sleeve (10) is rotatably sleeved on the transmission shaft (7).

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