A coke oven flue gas desulfurization device and desulfurization method thereof

Abstract

The invention relates to the technical field of flue gas desulfurization, and discloses a coke oven flue gas desulfurization device and a desulfurization method thereof, comprising a desulfurization tower and a smoke inlet pipe, wherein a first slurry pool and a second slurry pool are arranged in the desulfurization tower, the end of the smoke inlet pipe is connected with a first smoke pipe and a second smoke pipe which are interconnected, the first smoke pipe is plugged into the side of the first slurry pool, the second smoke pipe is plugged into the side of the second slurry pool, the side wall of the first slurry pool is plugged with a first liquid pipe, the side wall of the second slurry pool is plugged with a second liquid pipe, and a nozzle is arranged inside the desulfurization tower. The flue gas is passed into the first slurry pool through the first smoke pipe to react with limestone slurry, and at the same time, the slurry in the first slurry pool is discharged and the second slurry pool is injected with slurry, the first smoke pipe is closed and the second smoke pipe is opened, the flue gas is passed into the slurry in the second slurry pool through the second smoke pipe, the above steps are repeated, the flue gas is preliminarily desulfurized, and finally the flue gas enters the desulfurization tower, and the nozzle sprays the slurry to desulfurize the flue gas again, thereby improving the effect of flue gas desulfurization.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas desulfurization, in particular to a coke oven flue gas desulfurization device and a desulfurization method thereof. Background Art

[0002] Coke oven flue gas desulfurization equipment is mainly used to treat the sulfur-containing flue gas emitted by the coke oven during the production process to reduce environmental pollution. The coke oven flue gas contains a large amount of sulfides, especially sulfur dioxide. These gases are harmful to air quality and human health, so effective desulfurization treatment is required.

[0003] Common coke oven flue gas desulfurization methods include the following: 1. Wet desulfurization: Limestone-gypsum wet method: This is the most commonly used wet desulfurization technology. Desulfurization is achieved by contacting sulfur-containing flue gas with limestone slurry to produce calcium sulfate (gypsum) through a chemical reaction. This method has high desulfurization efficiency and stability; Ammonia desulfurization: Using ammonia water as a desulfurizer, sulfur dioxide in the flue gas reacts with ammonia water to produce ammonium bisulfate or ammonium sulfate; 2. Dry desulfurization: Dry lime method: Dry lime powder directly contacts the flue gas to produce gypsum through a chemical reaction. The dry desulfurization equipment is easy to operate and has low maintenance costs. Lower, but the desulfurization efficiency is lower than that of the wet method; circulating fluidized bed desulfurization: the flue gas is mixed with lime or calcium-based adsorbent and desulfurized through a fluidized bed reactor; 3. Semi-dry desulfurization: spray drying absorption method: the flue gas passes through a spray drying tower and comes into contact with the injected lime slurry to react and generate calcium sulfate. This method combines the advantages of wet and dry methods and can better control the by-products of the desulfurization process. These desulfurization equipment plays an important role in coke oven flue gas treatment. Through different desulfurization methods, sulfur dioxide emissions can be effectively reduced, meeting environmental protection requirements and reducing negative impacts on the environment.

[0004] At present, the existing wet desulfurization usually passes the flue gas into a desulfurization tower and sprays limestone slurry in the tower so that the sulfur dioxide in the flue gas reacts chemically with the limestone slurry to generate calcium sulfate, thereby desulfurizing the flue gas. However, the contact time between the flue gas and the limestone slurry is limited, making it difficult for the sulfur dioxide in the flue gas to fully react with the limestone slurry, which easily affects the desulfurization effect; therefore, it does not meet the existing needs. In this regard, we propose a coke oven flue gas desulfurization equipment and a desulfurization method thereof. Summary of the invention

[0005] The present invention provides a coke oven flue gas desulfurization device and a desulfurization method thereof, which have the beneficial effect of facilitating the full reaction of sulfur dioxide in the flue gas with limestone slurry, thereby improving the desulfurization effect, and solves the problem that the existing wet desulfurization mentioned in the above background technology usually passes the flue gas into a desulfurization tower, sprays limestone slurry in the tower, so that the sulfur dioxide in the flue gas reacts chemically with the limestone slurry to generate calcium sulfate, thereby desulfurizing the flue gas, but the contact time between the flue gas and the limestone slurry is limited, it is difficult to make the sulfur dioxide in the flue gas react fully with the limestone slurry, thereby easily affecting the desulfurization effect.

[0006] The present invention provides the following technical solution: a coke oven flue gas desulfurization device, comprising a desulfurization tower and a smoke inlet pipe connected to the desulfurization tower, wherein a first slurry pool and a second slurry pool are arranged inside the desulfurization tower, and the end of the smoke inlet pipe is connected to the first smoke pipe and the second smoke pipe which are connected to each other, the first smoke pipe is plugged into the side of the first slurry pool, the second smoke pipe is plugged into the side of the second slurry pool, and the first smoke pipe and the second smoke pipe are opened alternately, the side wall of the first slurry pool is also plugged into a first liquid pipe, and the middle part of the first liquid pipe is plugged into the side wall of the desulfurization tower, the side wall of the second slurry pool is also plugged into a second liquid pipe, and the middle part of the second liquid pipe is plugged into the side wall of the desulfurization tower, the side part of the desulfurization tower is plugged into a spray pipe, and the side part of the spray pipe is provided with a nozzle, and the nozzle is located inside the desulfurization tower for spraying limestone slurry.

[0007] As an optional scheme of the coke oven flue gas desulfurization equipment described in the present invention, wherein: the first slurry pool and the second slurry pool are both arranged at the bottom end of the desulfurization tower, the first slurry pool is arranged at the lower side of the second slurry pool, the first slurry pool is filled with limestone slurry, and the second slurry pool is set as an empty pool, the outer walls of the first slurry pool and the second slurry pool are both installed with support rods, the number of the support rods is set to several, and the ends of the support rods are connected to the inner wall of the desulfurization tower.

[0008] As an optional scheme of the coke oven flue gas desulfurization equipment described in the present invention, wherein: the smoke outlet ends of the first smoke pipe and the second smoke pipe are respectively arranged in the first slurry pool and the second slurry pool, and the smoke outlet ends of the first smoke pipe and the second smoke pipe are directed in opposite directions, the first smoke pipe and the second smoke pipe together form a "U" shape, and the smoke inlet pipe is connected to the middle part of the first smoke pipe and the second smoke pipe.

[0009] As an optional solution of a coke oven flue gas desulfurization equipment described in the present invention, a first connecting block is installed on the outside of the first smoke pipe, and a first baffle is slidably inserted between the first connecting block and the side of the first smoke pipe, and the first baffle is located in the first connecting block, so that the first smoke pipe is open.

[0010] As an optional solution of the coke oven flue gas desulfurization equipment of the present invention, wherein: a second connecting block is installed on the outer side of the second smoke pipe, and a second baffle is slidably inserted between the second connecting block and the side of the second smoke pipe, and the second baffle is located in the second smoke pipe, so that the second smoke pipe is closed;

[0011] A limiting ball is slidably inserted into the inner side of the second connecting block, and a first spring is arranged on the outer side of the limiting ball, one end of the first spring is connected to the limiting ball, and the other end of the first spring is connected to the inner wall of the second connecting block; a limiting groove for cooperating with the limiting ball is opened on the side of the second baffle, and the limiting ball is slidably inserted in the limiting groove; a plug rod is installed on the upper side of the second baffle, and the plug rod is inserted on the upper side of the second connecting block; a sleeve rod is slidably sleeved on the outer side of the plug rod, and a second spring is arranged in the sleeve rod, one end of the second spring is connected to the plug rod, and the other end of the second spring is connected to the inner wall of the sleeve rod, and the sleeve rod is arranged in a "U" shape with an opening downward, and a floating ball is installed on the other end of the sleeve rod, and the floating ball is located in the second slurry pool; a connecting rod is installed on the outer side of the plug rod, and the lower end of the connecting rod is connected to the first baffle.

[0012] As an optional scheme of the coke oven flue gas desulfurization equipment described in the present invention, a rotating shaft is set in the middle of the first slurry pool and the second slurry pool for common rotation, a first blade is set inside the first slurry pool, the number of the first blades is set to be several, and the several first blades are evenly arranged in annular direction inside the first slurry pool, one side of the first blade is connected to the rotating shaft, and the other side of the first blade has a gap with the inner wall of the first slurry pool; similarly, a second blade is set inside the second slurry pool.

[0013] As an optional scheme of a coke oven flue gas desulfurization equipment described in the present invention, wherein: a first hose is installed inside the first slurry pool, the first hose is arranged in an arc shape, the first hose is arranged at the bottom of the first slurry pool, a first roller is rotatably arranged on the outside of the first blade, the first roller squeezes the first hose, one end of the first hose is arranged inside the first slurry pool, the other end of the first hose is plugged into the side wall of the first slurry pool, and the other end of the first hose is connected to the first liquid pipe, the other end of the first liquid pipe is arranged outside the desulfurization tower, and the other end of the first liquid pipe is commonly connected to a first liquid inlet pipe and a first liquid outlet pipe that are interconnected, a first one-way valve is connected to the middle of the first liquid inlet pipe, and limestone slurry enters the first slurry pool through the first one-way valve, a second one-way valve is connected to the middle of the first liquid outlet pipe, and the limestone slurry in the first slurry pool is discharged through the second one-way valve.

[0014] As an optional scheme of the coke oven flue gas desulfurization equipment described in the present invention, wherein: similarly: a second hose is installed inside the second slurry pool, a second roller is rotatably arranged on the outside of the second blades, the other end of the second hose is connected to the second liquid pipe, and the other end of the second liquid pipe is commonly connected to a second liquid inlet pipe and a second liquid outlet pipe which are interconnected, a third one-way valve is connected in the middle of the second liquid inlet pipe, and a fourth one-way valve is connected in the middle of the second liquid outlet pipe.

[0015] As an optional scheme of a coke oven flue gas desulfurization equipment described in the present invention, wherein: a spoiler is arranged inside the desulfurization tower, the number of the spoilers is set to be several, and the several spoilers are vertically and evenly arranged inside the desulfurization tower, the spoilers are all arranged as semicircular pieces, the sides of the spoilers are all connected to the inner wall of the desulfurization tower, the number of the spray pipes is set to be several, and the spray pipes are respectively arranged between two adjacent spoilers, and a delivery pipe for conveying limestone slurry is arranged outside the desulfurization tower, and the ends of the spray pipes are all connected to the delivery pipe.

[0016] The present invention also provides a coke oven flue gas desulfurization method, comprising the following specific steps:

[0017] S1. Preliminary desulfurization of flue gas: the flue gas is introduced into the limestone slurry in the first slurry pool through the flue gas inlet pipe and the first flue gas pipe for preliminary desulfurization;

[0018] S2. Continuous preliminary desulfurization of flue gas: the limestone slurry after the reaction in the first slurry pool is continuously discharged, and new limestone slurry is injected into the second slurry pool at the same time. Subsequently, the first smoke pipe is closed and the second smoke pipe is opened, and the flue gas passes through the smoke inlet pipe and the second smoke pipe and enters the limestone slurry in the second slurry pool to continue preliminary desulfurization. The above steps are repeated in this cycle, so as to continuously perform preliminary desulfurization on the flue gas;

[0019] S3. Re-desulfurization of flue gas: The flue gas that has undergone preliminary desulfurization is released into the desulfurization tower and flows upward, reacting again with the limestone slurry sprayed from the nozzle to desulfurize the flue gas again, thereby improving the effect of flue gas desulfurization.

[0020] The present invention has the following beneficial effects:

[0021] 1. The coke oven flue gas desulfurization equipment and the desulfurization method thereof are as follows: the flue gas is introduced into the limestone slurry in the first slurry pool through the flue gas inlet pipe and the first flue gas pipe for chemical reaction to remove sulfur dioxide in the flue gas; moreover, the limestone slurry in the first slurry pool is continuously discharged through the first liquid pipe while participating in the reaction; at the same time, new limestone slurry is continuously injected into the second slurry pool through the second liquid pipe; then, the first flue gas pipe is closed and the second flue gas pipe is opened, and the flue gas is introduced into the limestone slurry in the second slurry pool through the flue gas inlet pipe and the second flue gas pipe for continuous reaction; the above steps are repeated in this cycle, thereby continuously performing preliminary desulfurization on the flue gas;

[0022] Finally, the flue gas that has undergone preliminary desulfurization is released into the desulfurization tower and flows upward, reacting again with the limestone slurry sprayed from the nozzle to desulfurize the flue gas again, thereby improving the effect of flue gas desulfurization.

[0023] 2. The coke oven flue gas desulfurization equipment and the desulfurization method thereof, the flue gas enters the limestone slurry in the first slurry pool through the flue gas inlet pipe and the first flue gas pipe for reaction desulfurization, and when the high-pressure flue gas enters the first slurry pool, it further drives the slurry therein to flow, thereby driving the first blade to rotate, so that the first roller on the first blade squeezes the first hose, sucks the slurry therein into the first hose, and discharges it through the first liquid pipe, the first liquid outlet pipe and the second one-way valve;

[0024] At the same time, the first blade drives the second blade to rotate through the rotating shaft, so that the second roller on the second blade squeezes the second hose, and the new limestone slurry from the outside is sucked into the second hose through the third one-way valve, the second liquid inlet pipe, and the second liquid pipe, thereby injecting limestone slurry into the second slurry pool through the second hose;

[0025] Moreover, with the injection of slurry into the second slurry pool, the rising liquid level drives the sleeve rod to move upward through the float, and the second spring is stretched. When a certain water level is reached, the rebound force of the second spring drives the second baffle to move upward through the insertion rod to open the second smoke pipe, and the limiting ball slides out of the limiting groove on the upper side, the first spring is compressed, and the insertion rod also drives the first baffle to move upward to close the first smoke pipe, and the limiting ball is inserted into the limiting groove on the lower side, so that the flue gas enters the second slurry pool through the smoke inlet pipe and the second smoke pipe for desulfurization, and the cycle is repeated, so that the flue gas is alternately passed into the first slurry pool and the second slurry pool for continuous preliminary desulfurization, thereby further improving the desulfurization effect of the flue gas.

[0026] 3. In the coke oven flue gas desulfurization equipment and the desulfurization method thereof, the flue gas in the desulfurization tower is hindered by the spoiler when flowing upward, which slows down the speed of the flue gas flowing through the desulfurization tower, so that the flue gas and the limestone slurry sprayed from the nozzle are more fully in contact, and the contact reaction time between the flue gas in the desulfurization tower and the limestone slurry is prolonged as much as possible, thereby improving the effect of flue gas re-desulfurization. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0028] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure of the first slurry pool of the present invention.

[0030] Figure 4 For the present invention Figure 3 Enlarged structural diagram at A in the middle.

[0031] Figure 5 It is a schematic diagram of the local three-dimensional structure of the present invention.

[0032] Figure 6 It is a schematic diagram of the local explosion structure of the present invention.

[0033] Figure 7 It is a schematic diagram of the structure of the first state of a partial cutaway of the present invention.

[0034] Figure 8 It is a partially cutaway schematic diagram of the structure of the present invention in the second state.

[0035] In the figure: 100, desulfurization tower; 110, smoke inlet pipe; 120, first slurry pool; 130, second slurry pool; 131, support rod; 140, first smoke pipe; 150, second smoke pipe; 160, first liquid pipe; 170, second liquid pipe; 180, first connecting block; 181, first baffle; 190, second connecting block; 191, second baffle; 192, stop ball; 193, first spring; 194, stop groove; 195, plug rod; 196, sleeve rod; 197, second spring; 198, float; 19 9. Connecting rod; 200. Rotating shaft; 201. First blade; 202. Second blade; 210. First hose; 211. First roller; 212. First liquid inlet pipe; 213. First liquid outlet pipe; 214. First one-way valve; 215. Second one-way valve; 220. Second hose; 221. Second roller; 222. Second liquid inlet pipe; 223. Second liquid outlet pipe; 224. Third one-way valve; 225. Fourth one-way valve; 230. Spray pipe; 240. Spray head; 241. Spoiler; 242. Delivery pipe. DETAILED DESCRIPTION

[0036] The following will be combined with the 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0037] Example 1: This example aims to promote the solution of the existing wet desulfurization. Usually, the flue gas is passed into the desulfurization tower, and limestone slurry is sprayed in the tower, so that the sulfur dioxide in the flue gas reacts with the limestone slurry to generate calcium sulfate, thereby desulfurizing the flue gas. However, the contact time between the flue gas and the limestone slurry is limited, and it is difficult for the sulfur dioxide in the flue gas to fully react with the limestone slurry, which easily affects the desulfurization effect. Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 5 A coke oven flue gas desulfurization device comprises a desulfurization tower 100 and a smoke inlet pipe 110 connected to the desulfurization tower 100. The smoke in the smoke inlet pipe 110 is pressurized by a pressurizing device and then passed into the desulfurization tower 100. A first slurry pool 120 and a second slurry pool 130 are arranged inside the desulfurization tower 100. The first slurry pool 120 and the second slurry pool 130 are both arranged at the bottom of the desulfurization tower 100. The first slurry pool 120 is arranged at the lower side of the second slurry pool 130. The first slurry pool 120 is filled with limestone slurry, and the second slurry pool 130 is arranged as an empty pool. Support rods 131 are fixedly installed on the outer walls of the first slurry pool 120 and the second slurry pool 130. Several support rods 131 are evenly arranged in a circumferential direction. The ends of the support rods 131 are fixedly connected to the inner wall of the desulfurization tower 100, so that the first slurry pool 120 and the second slurry pool 130 are fixed inside the desulfurization tower 100.

[0038] The end of the smoke inlet pipe 110 is connected to a first smoke pipe 140 and a second smoke pipe 150 which are interconnected. The first smoke pipe 140 is fixedly inserted into the side of the first slurry pool 120, and the second smoke pipe 150 is fixedly inserted into the side of the second slurry pool 130, and the first smoke pipe 140 and the second smoke pipe 150 are opened alternately. The smoke outlet ends of the first smoke pipe 140 and the second smoke pipe 150 are respectively arranged in the first slurry pool 120 and the second slurry pool 130, and the smoke outlet ends of the first smoke pipe 140 and the second smoke pipe 150 are in opposite directions. The first smoke pipe 140 and the second smoke pipe 150 together form a "U" shape, and the smoke inlet pipe 110 is connected to the middle of the first smoke pipe 140 and the second smoke pipe 150.

[0039] A first liquid pipe 160 is also fixedly connected to the side wall of the first slurry pool 120, and the middle part of the first liquid pipe 160 is plugged into the side wall of the desulfurization tower 100. A second liquid pipe 170 is also fixedly connected to the side wall of the second slurry pool 130, and the middle part of the second liquid pipe 170 is plugged into the side wall of the desulfurization tower 100, and the inlet and outlet directions of the first liquid pipe 160 and the second liquid pipe 170 are opposite. A spray pipe 230 is fixedly connected to the side of the desulfurization tower 100, and a plurality of nozzles 240 are arranged on the side of the spray pipe 230. The nozzles 240 are all located inside the desulfurization tower 100 for spraying limestone slurry. A waste pipe may also be arranged at the bottom of the desulfurization tower 100 to facilitate the discharge of the sprayed limestone slurry out of the desulfurization tower 100.

[0040] In this embodiment: the flue gas is introduced into the limestone slurry in the first slurry pool 120 through the smoke inlet pipe 110 and the first smoke pipe 140 to carry out a chemical reaction to remove sulfur dioxide in the flue gas. Moreover, the limestone slurry in the first slurry pool 120 is continuously discharged through the first liquid pipe 160 while participating in the reaction. At the same time, new limestone slurry is continuously injected into the second slurry pool 130 through the second liquid pipe 170. Subsequently, the first smoke pipe 140 is closed and the second smoke pipe 150 is opened. The flue gas is introduced into the limestone slurry in the second slurry pool 130 through the smoke inlet pipe 110 and the second smoke pipe 150 to continue to react. The above steps are repeated in this cycle, thereby continuously performing preliminary desulfurization on the flue gas.

[0041] Finally, the flue gas that has undergone preliminary desulfurization is released into the desulfurization tower 100 and flows upward, reacting again with the limestone slurry sprayed from the nozzle 240 to desulfurize the flue gas again, thereby improving the effect of flue gas desulfurization and solving as much as possible the problem that the existing wet desulfurization usually passes the flue gas into the desulfurization tower, sprays limestone slurry in the tower, and makes the sulfur dioxide in the flue gas react chemically with the limestone slurry to generate calcium sulfate, thereby desulfurizing the flue gas. However, the contact time between the flue gas and the limestone slurry is limited, making it difficult for the sulfur dioxide in the flue gas to fully react with the limestone slurry, which easily affects the desulfurization effect.

[0042] Embodiment 2: This embodiment is intended to solve the problem that it is inconvenient to alternately pass the flue gas into the first slurry pool 120 and the second slurry pool 130, which easily affects the initial desulfurization of the flue gas and thus easily affects the flue gas desulfurization effect. This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8A first connecting block 180 is fixedly installed on the outer side of the first smoke tube 140, and a first blocking piece 181 is slidably inserted between the first connecting block 180 and the side of the first smoke tube 140. The first blocking piece 181 is located in the first connecting block 180, so that the first smoke tube 140 is open. A second connecting block 190 is fixedly installed on the outer side of the second smoke tube 150, and a second blocking piece 191 is slidably inserted between the second connecting block 190 and the side of the second smoke tube 150. The second blocking piece 191 is located in the second smoke tube 150, so that the second smoke tube 150 is closed.

[0043] A limiting ball 192 is slidably inserted into the inner side of the second connecting block 190, and a first spring 193 is arranged on the outer side of the limiting ball 192. One end of the first spring 193 is fixedly connected to the limiting ball 192, and the other end of the first spring 193 is fixedly connected to the inner wall of the second connecting block 190. A limiting groove 194 used in conjunction with the limiting ball 192 is opened on the side of the second baffle 191. The limiting groove 194 is provided with two upper and lower limiting grooves. The limiting ball 192 is slidably inserted into the limiting groove 194 on the upper side. An insertion rod 195 is fixedly installed on the upper side of the second baffle 191. The insertion rod 195 is inserted into the upper side of the second connecting block 190. A sleeve rod 196 is slidably sleeved on the outer side of the insertion rod 195. A second spring 197 is provided in 196, one end of the second spring 197 is fixedly connected to the insertion rod 195, and the other end of the second spring 197 is fixedly connected to the inner wall of the sleeve rod 196, the sleeve rod 196 is set to be a "U" shape with an opening downward, and a float 198 is fixedly installed on the other end of the sleeve rod 196. The float 198 is located in the second slurry pool 130, the rigidity of the first spring 193 is greater than the rigidity of the second spring 197, the maximum buoyancy of the limestone slurry on the float 198 is greater than the resistance of the limit ball 192 to slide out of the limit groove 194, and a connecting rod 199 is fixedly installed on the outside of the insertion rod 195, and the lower end of the connecting rod 199 is fixedly connected to the lower side of the first baffle 181.

[0044] A rotating shaft 200 is provided in the middle of the first slurry pool 120 and the second slurry pool 130 for common rotation through a sealed bearing, a first blade 201 is provided inside the first slurry pool 120, the number of the first blades 201 is set to be several, and the several first blades 201 are evenly arranged in an annular direction inside the first slurry pool 120, one side of the first blade 201 is fixedly connected to the rotating shaft 200, and the other side of the first blade 201 leaves a gap with the inner wall of the first slurry pool 120, so that the first smoke pipe 140 and the float 198 will not hinder the rotation of the first blade 201; similarly: a second blade 202 is provided inside the second slurry pool 130.

[0045] A first hose 210 is fixedly installed inside the first slurry pool 120. The first hose 210 is set in an arc shape. The first hose 210 is set at the bottom of the first slurry pool 120. A first roller 211 is rotatably set outside the first blade 201. The first roller 211 squeezes the first hose 210. One end of the first hose 210 is set inside the first slurry pool 120, and the other end of the first hose 210 is fixedly plugged into the side wall of the first slurry pool 120, and the other end of the first hose 210 is connected to the first The liquid pipe 160 is connected, and the other end of the first liquid pipe 160 is arranged outside the desulfurization tower 100, and the other end of the first liquid pipe 160 is commonly connected to a first liquid inlet pipe 212 and a first liquid outlet pipe 213 that are interconnected. A first one-way valve 214 is connected to the middle of the first liquid inlet pipe 212, and the limestone slurry enters the first slurry pool 120 through the first one-way valve 214. A second one-way valve 215 is connected to the middle of the first liquid outlet pipe 213, and the limestone slurry in the first slurry pool 120 is discharged through the second one-way valve 215.

[0046] Similarly: a second hose 220 is fixedly installed inside the second slurry pool 130, and a second roller 221 is rotatably arranged on the outer side of the second blade 202. The other end of the second hose 220 is connected to the second liquid pipe 170, and the other end of the second liquid pipe 170 is commonly connected to a second liquid inlet pipe 222 and a second liquid outlet pipe 223 which are connected to each other, a third one-way valve 224 is connected to the middle of the second liquid inlet pipe 222, a fourth one-way valve 225 is connected to the middle of the second liquid outlet pipe 223, and the ends of the first liquid inlet pipe 212 and the second liquid inlet pipe 222 are both connected to new limestone slurry from the outside.

[0047] In this embodiment: the flue gas enters the limestone slurry in the first slurry pool 120 through the flue gas inlet pipe 110 and the first flue gas pipe 140 for reaction and desulfurization, and when the high-pressure flue gas enters the first slurry pool 120, it further drives the slurry therein to flow, thereby driving the first blade 201 to rotate, so that the first roller 211 on the first blade 201 squeezes the first hose 210, sucks the slurry therein into the first hose 210, and discharges it through the first liquid pipe 160, the first liquid outlet pipe 213 and the second one-way valve 215;

[0048] At the same time, the first blade 201 drives the second blade 202 to rotate through the rotating shaft 200, so that the second roller 221 on the second blade 202 squeezes the second hose 220, and the new limestone slurry from the outside is sucked into the second hose 220 through the third one-way valve 224, the second liquid inlet pipe 222, and the second liquid pipe 170, so that the limestone slurry is injected into the second slurry pool 130 through the second hose 220;

[0049] Moreover, with the injection of slurry into the second slurry pool 130, the rising liquid level drives the sleeve rod 196 to move upward through the float 198, and the second spring 197 is stretched. When a certain water level is reached, the rebound force of the second spring 197 drives the second baffle 191 to move upward through the insertion rod 195 to open the second smoke pipe 150, and the limiting ball 192 slides out of the upper limiting groove 194, the first spring 193 is compressed, and the insertion rod 195 also drives the first baffle 181 to move upward to close the first smoke pipe 140, and the limiting ball 192 is inserted into the lower limiting groove 194, so that the flue gas enters the second slurry pool 130 through the smoke inlet pipe 110 and the second smoke pipe 150 for desulfurization, and the cycle is repeated, so that the flue gas is alternately passed into the first slurry pool 120 and the second slurry pool 130 for continuous preliminary desulfurization, thereby further improving the desulfurization effect of the flue gas.

[0050] It should be noted that after the flue gas enters the second slurry pool 130, it drives the second blade 202 to rotate in the opposite direction, so that the slurry in the second slurry pool 130 is discharged through the second hose 220, the second liquid pipe 170, the second liquid outlet pipe 223 and the fourth one-way valve 225. Under the action of the deadweight of the sleeve rod 196 and the float 198, the float 198 descends with the liquid level and compresses the second spring 197. When the slurry in the second slurry pool 130 is discharged, the compressed second spring 197 rebounds, so that the second baffle 191 descends and resets to close the second smoke pipe 150 again, and at the same time the first baffle 181 moves downward to open the first smoke pipe 140 again, and new limestone slurry is injected into the first slurry pool 120 through the first one-way valve 214, the first liquid inlet pipe 212, the first liquid pipe 160 and the first hose 210.

[0051] Embodiment 3: This embodiment aims to promote the solution of the problem that the flue gas in the desulfurization tower 100 and the limestone slurry sprayed from the nozzle 240 have a short contact reaction time, which is easy to affect the re-desulfurization effect of the flue gas. This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figure 1 and Figure 2 A spoiler 241 is arranged inside the desulfurization tower 100, and the number of the spoilers 241 is set to be several, and the several spoilers 241 are vertically and evenly arranged inside the desulfurization tower 100, the spoilers 241 are all set to be semicircular pieces, and the sides of the spoilers 241 are fixedly connected to the inner wall of the desulfurization tower 100, the number of the spray pipes 230 is set to be several, and the spray pipes 230 are respectively arranged between two adjacent spoilers 241, and a delivery pipe 242 for conveying limestone slurry is arranged outside the desulfurization tower 100, and the ends of the spray pipes 230 are connected to the delivery pipe 242.

[0052] In this embodiment, the flue gas in the desulfurization tower 100 is hindered by the spoiler 241 when flowing upward, which slows down the speed of the flue gas flowing through the desulfurization tower 100, allowing the flue gas to contact the limestone slurry sprayed by the nozzle 240 more fully, and prolonging the contact reaction time between the flue gas in the desulfurization tower 100 and the limestone slurry as much as possible, thereby improving the effect of flue gas re-desulphurization.

[0053] Embodiment 4, a coke oven flue gas desulfurization method, comprising the following specific steps:

[0054] S1. Preliminary desulfurization of flue gas: The flue gas is introduced into the limestone slurry in the first slurry pool 120 through the flue gas inlet pipe 110 and the first flue gas pipe 140 for preliminary desulfurization;

[0055] S2. Continuous preliminary desulfurization of flue gas: the reacted limestone slurry in the first slurry pool 120 is continuously discharged, and new limestone slurry is injected into the second slurry pool 130. Subsequently, the first smoke pipe 140 is closed and the second smoke pipe 150 is opened. The flue gas passes through the smoke inlet pipe 110 and the second smoke pipe 150 and enters the limestone slurry in the second slurry pool 130 to continue preliminary desulfurization. The above steps are repeated in this cycle, so as to continuously perform preliminary desulfurization on the flue gas.

[0056] S3. Re-desulfurization of flue gas: The flue gas that has undergone preliminary desulfurization is released into the desulfurization tower 100 and flows upward, reacting again with the limestone slurry sprayed from the nozzle 240 to desulfurize the flue gas again, thereby improving the effect of flue gas desulfurization.

[0057] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A coke oven flue gas desulfurization device, comprising a desulfurization tower (100) and a smoke inlet pipe (110) connected to the desulfurization tower (100), characterized in that: The desulfurization tower (100) is provided with a first slurry pool (120) and a second slurry pool (130) inside, the end of the smoke inlet pipe (110) is connected to a first smoke pipe (140) and a second smoke pipe (150) which are interconnected, the first smoke pipe (140) is plugged into a side portion of the first slurry pool (120), the second smoke pipe (150) is plugged into a side portion of the second slurry pool (130), and the first smoke pipe (140) and the second smoke pipe (150) are alternately opened, and the side wall of the first slurry pool (120) is also plugged into a A first liquid pipe (160) is provided, the middle portion of the first liquid pipe (160) is plugged into the side wall of the desulfurization tower (100), the side wall of the second slurry pool (130) is also plugged into a second liquid pipe (170), the middle portion of the second liquid pipe (170) is plugged into the side wall of the desulfurization tower (100), a spray pipe (230) is plugged into the side of the desulfurization tower (100), a spray head (240) is provided on the side of the spray pipe (230), and the spray head (240) is located inside the desulfurization tower (100) and is used for spraying limestone slurry; the first The slurry pool (120) and the second slurry pool (130) are both arranged at the bottom end of the desulfurization tower (100), the first slurry pool (120) is arranged at the lower side of the second slurry pool (130), the first slurry pool (120) is filled with limestone slurry, and the second slurry pool (130) is arranged as an empty pool, and the outer walls of the first slurry pool (120) and the second slurry pool (130) are both installed with support rods (131), the number of the support rods (131) is set to be a plurality, and the ends of the support rods (131) are arranged to be Both are connected to the inner wall of the desulfurization tower (100); the smoke outlet ends of the first smoke pipe (140) and the second smoke pipe (150) are respectively arranged in the first slurry pool (120) and the second slurry pool (130); the smoke outlet ends of the first smoke pipe (140) and the second smoke pipe (150) are oriented in opposite directions; the first smoke pipe (140) and the second smoke pipe (150) together form a "U" shape; the smoke inlet pipe (110) is connected to the middle parts of the first smoke pipe (140) and the second smoke pipe (150).

2. A coke oven flue gas desulfurization equipment according to claim 1, characterized in that: A first connection block (180) is installed on the outside of the first smoke pipe (140); a first blocking piece (181) is slidably inserted between the first connection block (180) and the side of the first smoke pipe (140); the first blocking piece (181) is located inside the first connection block (180), so that the first smoke pipe (140) is open.

3. A coke oven flue gas desulfurization equipment according to claim 2, characterized in that: A second connecting block (190) is installed on the outside of the second smoke tube (150); a second blocking piece (191) is slidably inserted between the second connecting block (190) and the side of the second smoke tube (150); the second blocking piece (191) is located inside the second smoke tube (150), so that the second smoke tube (150) is closed; A limiting ball (192) is slidably inserted into the inner side of the second connecting block (190), a first spring (193) is arranged on the outer side of the limiting ball (192), one end of the first spring (193) is connected to the limiting ball (192), and the other end of the first spring (193) is connected to the inner wall of the second connecting block (190), a limiting groove (194) for use with the limiting ball (192) is opened on the side of the second blocking piece (191), and the limiting ball (192) is slidably inserted into the limiting groove (194), and an insertion rod (195) is installed on the upper side of the second blocking piece (191), and the insertion rod (195) is inserted into the second connecting block (190). ) on the upper side, a sleeve rod (196) is slidably sleeved on the outer side of the insertion rod (195), a second spring (197) is arranged inside the sleeve rod (196), one end of the second spring (197) is connected to the insertion rod (195), the other end of the second spring (197) is connected to the inner wall of the sleeve rod (196), the sleeve rod (196) is arranged in a "U" shape with an opening downward, a float (198) is installed on the other end of the sleeve rod (196), the float (198) is located in the second slurry pool (130), a connecting rod (199) is installed on the outer side of the insertion rod (195), and the lower end of the connecting rod (199) is connected to the first baffle (181).

4. A coke oven flue gas desulfurization equipment according to claim 3, characterized in that: A rotating shaft (200) is provided in the middle of the first slurry pool (120) and the second slurry pool (130) for co-rotation, a first blade (201) is provided inside the first slurry pool (120), the number of the first blades (201) is set to be a plurality, and the plurality of first blades (201) are uniformly arranged in an annular direction inside the first slurry pool (120), one side of the first blade (201) is connected to the rotating shaft (200), and the other side of the first blade (201) leaves a gap with the inner wall of the first slurry pool (120); similarly: a second blade (202) is provided inside the second slurry pool (130).

5. A coke oven flue gas desulfurization equipment according to claim 4, characterized in that: A first hose (210) is installed inside the first slurry pool (120), the first hose (210) is arranged in an arc shape, the first hose (210) is arranged at the bottom of the first slurry pool (120), a first roller (211) is rotatably arranged outside the first blade (201), the first roller (211) squeezes the first hose (210), one end of the first hose (210) is arranged inside the first slurry pool (120), the other end of the first hose (210) is plugged into the side wall of the first slurry pool (120), and the other end of the first hose (210) is connected to the first blade (201). The first liquid pipe (160) is connected to the first slurry pool (120), the other end of the first liquid pipe (160) is arranged outside the desulfurization tower (100), and the other end of the first liquid pipe (160) is commonly connected to a first liquid inlet pipe (212) and a first liquid outlet pipe (213) which are connected to each other, a first one-way valve (214) is connected to the middle of the first liquid inlet pipe (212), and limestone slurry enters the first slurry pool (120) through the first one-way valve (214), and a second one-way valve (215) is connected to the middle of the first liquid outlet pipe (213), and the limestone slurry in the first slurry pool (120) is discharged through the second one-way valve (215).

6. A coke oven flue gas desulfurization equipment according to claim 5, characterized in that: similarly: a second hose (220) is installed inside the second slurry pool (130), a second roller (221) is rotatably arranged on the outer side of the second blade (202), the other end of the second hose (220) is connected to the second liquid pipe (170), and the other end of the second liquid pipe (170) is commonly connected to a second liquid inlet pipe (222) and a second liquid outlet pipe (223) that are connected to each other, a third one-way valve (224) is connected to the middle of the second liquid inlet pipe (222), and a fourth one-way valve (225) is connected to the middle of the second liquid outlet pipe (223).

7. The coke oven flue gas desulfurization equipment according to claim 1, characterized in that: A spoiler (241) is arranged inside the desulfurization tower (100), the number of the spoilers (241) is set to be a plurality, and the plurality of spoilers (241) are evenly arranged vertically inside the desulfurization tower (100), the spoilers (241) are all arranged as semicircular pieces, and the sides of the spoilers (241) are all connected to the inner wall of the desulfurization tower (100), the number of the spray pipes (230) is set to be a plurality, and the spray pipes (230) are respectively arranged between two adjacent spoilers (241), and a delivery pipe (242) for conveying limestone slurry is arranged outside the desulfurization tower (100), and the ends of the spray pipes (230) are all connected to the delivery pipe (242).

8. A method for desulfurizing coke oven flue gas, according to a coke oven flue gas desulfurization device according to any one of claims 1 to 7, characterized in that: The specific steps include: S1. Preliminary desulfurization of flue gas: the flue gas is introduced into the limestone slurry in the first slurry pool (120) through the flue gas inlet pipe (110) and the first flue gas pipe (140) for preliminary desulfurization; S2. Continuous preliminary desulfurization of flue gas: the limestone slurry after the reaction in the first slurry pool (120) is continuously discharged, and new limestone slurry is injected into the second slurry pool (130). Subsequently, the first smoke pipe (140) is closed and the second smoke pipe (150) is opened, and the flue gas passes through the smoke inlet pipe (110) and the second smoke pipe (150) and enters the limestone slurry in the second slurry pool (130) to continue preliminary desulfurization. The above steps are repeated in a cycle, thereby continuously performing preliminary desulfurization on the flue gas. S3. Re-desulfurization of flue gas: the flue gas that has undergone preliminary desulfurization is released into the desulfurization tower (100) and flows upward, reacting again with the limestone slurry sprayed from the nozzle (240) to desulfurize the flue gas again, thereby improving the effect of flue gas desulfurization.

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