Slag wetting device and method of using same

Abstract

This invention discloses a slag humidification device and its usage method, comprising: a drum; an annular jacket disposed on the outer surface of the drum; a pump connected to the middle of the annular jacket; a partition fixed inside the annular jacket, the partition and the pump dividing the annular jacket into a first cavity and a second cavity; several suction pipes evenly distributed on the inner wall of the drum towards the center of the drum, the suction pipes communicating with the first cavity; a water storage cavity located on the outer surface of the second cavity and communicating with the second cavity through a one-way valve; and several spray pipes distributed on the inner wall of the drum towards the center of the drum, the spray pipes communicating with the second cavity. The beneficial effect of this invention is that the annular jacket, suction pipes, pump, and spray pipes form a circulating flow channel for flue gas flow, driving water to enter the spray pipes. The gas-water mixture is converted into water vapor inside the drum, and then enters the annular jacket through the suction pipes, realizing the water-gas conversion and reducing water consumption.

Description

Technical Field

[0001] This invention relates to the field of pyrite production, and more particularly to a slag humidification device and its usage method. Background Technology

[0002] The slag discharged from the fluidized bed furnace enters the slag cooler for initial cooling, and is then conveyed to the intermediate slag bin via a scraper. Inside the bin, it is collected together with boiler slag and ash from the cyclone dust collector, and then fed into the humidification drum through a bottom star-shaped ash discharge valve. Water pipes are installed inside the humidification drum to spray water for cooling and humidifying the slag. During this process, the water evaporates upon heating, producing a large amount of water vapor, which can carry fine slag particles and easily generate dust.

[0003] To address the existing problems, the current technological approach is as follows: Figure 1 As shown, the flue gas is drawn into a newly added spray tower adjacent to the humidifying drum through the upper inlet duct at the tail end. Inside the tower, the gas and liquid react counter-currently, washing away particulate matter in the flue gas. The clean flue gas is discharged from the top of the tower and then exits through a fan and chimney. The ash collected in the packed tower continuously accumulates in the circulating liquid. Part of it bypasses the outlet of the circulating pump and re-enters the humidifying drum as spray water, while the rest enters the tower as dust removal water. While the dust-laden wastewater is used for spray cooling and dust removal, the heat from the burning slag inside the humidifying drum also acts as a thermal energy reaction on this portion of the water-containing ash slag, drying it. The dried slag is then mixed and reused, improving the slag recovery rate.

[0004] Chinese invention patent publication number CN101580231A discloses a slag conveying method in pyrite-based acid production. The high-temperature slag from the roasting furnace is cooled and its heat is recovered by a slag cooler and then directly conveyed to a designated stockpile by a belt conveyor. The waste boiler and electrostatic precipitate slag are cooled and humidified by their respective submersible cooling drums and then conveyed to a designated stockpile by a belt conveyor. Chinese invention patent publication number CN102230076A discloses an integrated process for enhancing pelletizing by combining waste heat from hot slag with slag humidification. The hot slag discharged from the fluidized bed furnace enters a slag cooler. Inside the slag cooler, heat exchange between water and hot slag is used to lower the slag temperature to below 200°C. The slag is then transported to a slag intermediate silo, where slag from the fluidized bed furnace, waste heat boiler, and cyclone dust collector are combined. The combined slag then exits the slag intermediate silo and enters a cylindrical humidifier for water addition and further cooling. After being humidified to a moisture content of 10-14% by mass, the slag is transported to a slag storage silo to further uniformly wet the surface of the slag, thereby improving its pelletizing properties.

[0005] Chinese utility model patent publication number CN201161930Y discloses a cooling and humidifying drum, which includes a cooling drum composed of multiple sections connected in series, with adjacent sections connected by concave and convex flanges. The cooling drum has a rolling ring on its outer periphery, and a support roller on the lower side of the rolling ring. The cooling drum also has a gear on its outer periphery that is connected to a drive mechanism. One end of the cooling drum has a feed inlet, and the humidifying drum has a humidifying spray pipe inside. The bottom of the unloading box has a discharge outlet, and the top of the unloading box has a steam outlet pipe. The steam outlet pipe is connected to a chimney via a water film dust collector. One end of the humidifying drum is fixedly connected to the cooling drum. The inner wall of the humidifying drum has several rows of guide plates, and the inclination angle between each row of guide plates and the central axis of the humidifying drum is equal.

[0006] Chinese invention patent authorization announcement number CN107490298B discloses a cooling and humidifying drum, which includes a drum, a rapping device, and a cooling and humidifying device. The cooling and humidifying device uses a spiral nozzle in the cooling and humidifying device to spray a large amount of cooling spray to exchange heat with the hot slag.

[0007] None of the above patents solve the dust problem generated during the humidification process. To remove the dust, a series of flue gas treatment devices are required, which are costly to use and often occupy a large area. Moreover, the humidification drums all have water pipes inserted into them at the discharge end, and the water mist sprayed is directed in the direction of the slag's movement. This results in a large amount of water being consumed for humidification, and the contact between the water mist and the slag is not sufficient. Summary of the Invention

[0008] The technical problem to be solved by the present invention is that existing cylindrical humidifiers have problems such as dust generation, high water consumption, and limited contact area between water mist and slag. To address this, a slag humidification device and its usage method are provided.

[0009] The technical solution of the present invention is: a slag humidification device, comprising: a drum; an annular jacket disposed on the outer surface of the drum; a pump connected to the middle of the annular jacket; a partition fixed inside the annular jacket, the partition and the pump dividing the annular jacket into a first cavity and a second cavity; a suction pipe, of which there are several, evenly distributed on the inner wall of the drum towards the center of the drum, the suction pipe communicating with the first cavity; a water storage cavity, the water storage cavity located on the outer surface of the second cavity and communicating with the second cavity through a one-way valve; and a spray pipe, of which there are several, distributed on the inner wall of the drum towards the center of the drum, the spray pipe communicating with the second cavity.

[0010] The nozzle described in the above scheme is a cone shape that gradually expands towards the center of the drum.

[0011] The improvement to the above solution is that the nozzle contains a ball, and the ball is fitted with the nozzle with a clearance.

[0012] A further improvement to the above solution is that the roller is provided with a first annular limiting groove and a second annular limiting groove, the first annular limiting groove and the second annular limiting groove are respectively located at both ends of the annular sleeve, and annular limiting plates are detachably connected to the first annular limiting groove and the second annular limiting groove.

[0013] The water storage chamber described in the above scheme is connected to the water source through a water pipe.

[0014] A further improvement to the above solution is that the straw is equipped with a filter screen.

[0015] The method of using the slag humidification device includes the following steps: the drum rotates, the slag enters from the feed end of the drum and is discharged to the slag discharge belt from the discharge end; the pump is started, the pump draws the flue gas in the drum into the first chamber through the suction pipe, and then discharges the flue gas into the second chamber through the pump, and finally enters the drum through the spray pipe, so that the flue gas forms a circulation in the drum and the annular jacket; the one-way valve is opened, the water storage chamber drains water into the second chamber, the water is carried by the flowing flue gas into the drum through the spray pipe, the water is heated to form water vapor and then drawn into the first chamber through the suction pipe.

[0016] The beneficial effect of this invention is that the annular jacket, suction pipe, pump and nozzle form a circulating flow channel for flue gas flow, which drives the water entering from the water storage chamber into the nozzle. The gas-water mixture is turned into water vapor in the drum, and then enters the annular jacket through the suction pipe, realizing the water-gas conversion, which greatly reduces water consumption. In addition, the nozzle and the forward direction of the slag are perpendicular to each other, which shortens the water head and ensures that the water and slag are in full contact. Attached Figure Description

[0017] Figure 1 This is a flow chart of the existing slag treatment process; Figure 2 This is a schematic diagram of the slag humidification device of the present invention; Figure 3 yes Figure 2 Side view; Figure 4 yes Figure 2 A three-dimensional image; Figure 5 This is a schematic diagram of Example 4; In the diagram, 1. Roller, 2. Annular jacket, 21. First cavity, 22. Second cavity, 3. Pump, 4. Baffle, 5. Suction pipe, 6. Water storage cavity, 7. Check valve, 8. Nozzle, 9. Ball, 10. Annular limiting plate. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments implemented by those skilled in the art without creative effort are within the protection scope of the present invention.

[0019] like Figure 2-4 As shown, Embodiment 1 includes: a roller 1, with a pair of rolling rings fixed to the outer wall of the roller, a support base located directly below the rolling rings, and a pair of rollers fixed to the support base to support the rolling rings, the rollers being rotatably connected to the support base; an annular sleeve 2, the annular sleeve being located on the outer surface of the roller; a pump 3, the pump being connected to the middle of the annular sleeve; a partition 4, the partition being fixed inside the annular sleeve, the partition and the pump dividing the annular sleeve into a first cavity 21 and a second cavity 22, the left side of the pump being the air inlet end, which communicates with the first cavity, and the right side of the pump being the exhaust end, which communicates with the second cavity; and four suction pipes 5, evenly distributed along the radial direction of the roller. The suction tube is connected to the first chamber and its length should be as close as possible to the central axis of the drum. This is because, according to the principle of centrifugal force, when the drum rotates, the heavier slag is closer to the inner wall of the drum, while the lighter dust and smoke are closer to the center of the drum. Therefore, when the suction tube is long, it is not easy to suck up large pieces of slag. The water storage chamber 6 is located on the outer surface of the second chamber and is connected to the second chamber through a one-way valve 7. The one-way valve can be a solenoid valve or an electric valve and can be remotely controlled to open. There are four spray pipes 8, which are evenly distributed along the radial direction of the drum on the inner wall of the drum and face the center of the drum. The spray pipes are connected to the second chamber.

[0020] Example 2: The difference from Example 1 is that the nozzle is a cone shape that gradually expands towards the center of the drum. When water enters the drum through the nozzle, it can increase the contact area with the slag.

[0021] Example 3: The difference from Example 2 is that the nozzle has a ball 9 inside. The ball and the nozzle are fitted with a gap. When water impacts the surface of the ball, it will spread out naturally in a ring-shaped radial pattern, forming a uniform spray over a large area.

[0022] Example 4: Figure 5 As shown, the difference from Embodiment 1 is that the roller is provided with a first annular limiting groove and a second annular limiting groove. The first annular limiting groove and the second annular limiting groove are respectively located at both ends of the annular sleeve. The first annular limiting groove and the second annular limiting groove are respectively detachably connected with annular limiting plates 10. The annular limiting plates cooperate with the first annular limiting groove and the second annular limiting groove to limit the annular sleeve.

[0023] Example 5: The difference from Example 1 is that the water storage chamber is connected to the water source through a water pipe. When the water in the water storage chamber is insufficient, water can be added to the water storage chamber at any time.

[0024] Example 6: The difference from Example 1 is that the suction tube is equipped with a filter screen, which can block larger slag or dust and prevent them from entering the annular jacket.

[0025] Example 7: The difference from Example 1 is that there are 8 suction tubes, arranged in two rows, with 4 tubes in each row distributed radially along the roller. There are 8 nozzles, arranged in two rows, with 4 nozzles in each row distributed radially along the roller.

[0026] The method of using the slag humidification device includes the following steps: the drum rotates, the slag enters from the feed end of the drum and is discharged to the slag discharge belt from the discharge end; the pump is started, the pump draws the flue gas in the drum into the first chamber through the suction pipe, and then discharges the flue gas into the second chamber through the pump, and finally enters the drum through the spray pipe, so that the flue gas forms a circulation in the drum and the annular jacket; the one-way valve is opened, the water storage chamber drains water into the second chamber, the water is carried by the flowing flue gas into the drum through the spray pipe, the water is heated to form water vapor and then drawn into the first chamber through the suction pipe.

[0027] This invention cleverly utilizes the water vapor generated during humidification by confining the water vapor circulation within an annular jacket. A pump drives water into the nozzle, ensuring sufficient velocity for uniform humidification of the slag with minimal water usage. The humidification water vapor contains a small amount of slag, which circulates within the drum and annular jacket. As the slag enters the annular jacket from the suction pipe, its temperature decreases. When the slag re-enters the drum from the nozzle, the heat from the humidified slag in the drum acts as a thermal energy reaction, drying this portion of the slag and improving slag recovery rate.

Claims

1. A slag wetting device, characterized by comprising: Roller (1); annular sleeve (2), the annular sleeve being disposed on the outer surface of the roller; Pump (3), the pump is connected to the middle of the annular jacket; partition (4), the partition is fixed inside the annular jacket, the partition and the pump divide the annular jacket into a first cavity (21) and a second cavity (22); suction pipe (5), there are several suction pipes, evenly distributed on the inner wall of the drum and facing the center of the drum, the suction pipes are connected to the first cavity; water storage cavity (6), the water storage cavity is located on the outer surface of the second cavity and is connected to the second cavity through a one-way valve (7); spray pipe (8), there are several spray pipes, distributed on the inner wall of the drum and facing the center of the drum, the spray pipes are connected to the second cavity.

2. The slag wetting device of claim 1, wherein: The nozzle is a cone shape that gradually expands towards the center of the drum.

3. The slag wetting device of claim 2, wherein: The nozzle contains a ball (9), which is fitted with the nozzle with a clearance.

4. The slag wetting device of claim 1, wherein: The roller is provided with a first annular limiting groove and a second annular limiting groove. The first annular limiting groove and the second annular limiting groove are located at both ends of the annular sleeve, and annular limiting plates (10) are detachably connected to the first annular limiting groove and the second annular limiting groove, respectively.

5. The slag wetting device of claim 1, wherein: The water storage chamber is connected to the water source through a water pipe (11).

6. The slag wetting device of claim 1, wherein: The straw is equipped with a filter screen.

7. A method of using a slag moistening device according to any one of claims 1-6, characterized in that: Includes the following steps: As the drum rotates, the slag enters from the feed end and exits to the slag discharge belt from the discharge end. The pump is started, and the pump draws the flue gas in the drum into the first chamber through the suction pipe. The flue gas is then discharged into the second chamber through the pump and finally enters the drum through the nozzle, so that the flue gas forms a circulation between the drum and the annular jacket. The one-way valve opens, and the water storage chamber drains water into the second chamber. The water is carried by the flowing flue gas and enters the drum through the nozzle. The water is heated to form water vapor and is then drawn into the first chamber through the suction pipe.

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