Coal briquette bubbling upgrading device

Abstract

This utility model discloses a coal bubbling and upgrading device, relating to the technical field of coal upgrading devices. It includes a washing tank, a washing liquid inlet pipe, a flue gas inlet pipe, and a coal storage bin. The washing tank has an inlet and an outlet. The washing liquid inlet pipe is connected to the washing tank and is used to transport the washing liquid into the washing tank. The flue gas inlet pipe is also connected to the washing tank and is used to transport hot flue gas into the washing tank. The coal storage bin has an inlet end and a outlet end. The inlet end is connected to the outlet end, and a first valve is provided at this connection. A second valve is provided at the outlet end. Using this utility model, wide-diameter coal blocks can be washed and upgraded to remove AAEM from the coal blocks. Simultaneously, by setting a coal storage bin at the bottom of the washing tank, the coal blocks and washing liquid can be temporarily stored in the storage bin during the discharge of washed coal blocks, preventing rapid loss of the washing liquid in the washing tank and thus ensuring sufficient washing of the coal blocks in the upper washing tank.

Description

Technical Field

[0001] This utility model relates to the technical field of coal briquettes upgrading devices, and more specifically, to a coal briquettes bubbling upgrading device. Background Technology

[0002] Coal lumps contain a significant amount of alkali metals and alkaline earth metals (AAEMs). Current technologies primarily employ flotation and bubbling upgrading devices to wash and remove AAEMs. Due to the large size of coal lumps, traditional flotation devices mainly use micron-sized lumps, requiring grinding the coal into micron-sized pieces. This necessitates fine grinding and screening processes, as well as complex dewatering processes, resulting in a complex and costly operation. Bubbling upgrading devices, on the other hand, can wash and upgrade wide-sized coal lumps (referring to a wide range of particle sizes, from microns to centimeters, generally less than 3 centimeters) to remove AAEMs. This eliminates the need for grinding the coal lumps and allows the use of hot flue gas from power plants. The enhanced washing effect of the hot flue gas enables the dealkali removal and upgrading of large-sized coal lumps, simplifying the operation and reducing production costs.

[0003] However, after the bubbling upgrading unit washes and upgrades the coal to remove AAEM, it needs to open the valve at the bottom of the washing tank to discharge the coal for further washing. However, due to the accumulation of coal at the bottom of the washing tank, and the continuous input of washing liquid into the tank via the inlet pipe, the discharge rate of the coal after the valve is opened is much lower than the outflow rate of the washing liquid in the tank. This rapid loss of washing liquid during the coal discharge process leads to insufficient washing of the coal in the upper washing tank, affecting the washing effect. Utility Model Content

[0004] The purpose of this invention is to provide a coal bubbling and upgrading device, which can wash and upgrade wide-sized coal blocks to remove AAEMs from the coal blocks. In addition to alkali metals and alkaline earth metals, it can also remove chlorine. The increase in temperature can promote the dissolution of chlorine and its chemical reaction rate. At the same time, by setting a coal storage bin at the bottom of the washing tank, the coal blocks and washing liquid can be temporarily stored in the coal storage bin during the discharge of the washed coal blocks, which prevents the rapid loss of the washing liquid in the washing tank from causing insufficient washing of the coal blocks in the upper washing tank.

[0005] The technical solution adopted in this utility model is as follows:

[0006] This application provides a coal bubbling and upgrading device, comprising:

[0007] An immersion tank having an inlet and an outlet, the inlet being located above the outlet;

[0008] The immersion liquid inlet pipe is connected to the end of the immersion tank near the discharge port, and the immersion liquid inlet pipe is used to transport the immersion liquid into the immersion tank.

[0009] A flue gas inlet pipe, which is connected to the immersion tank, is used to transport hot flue gas into the immersion tank; and

[0010] A coal storage bin has a feed end and a discharge end. The feed end is connected to the discharge port, and a first valve is provided at the connection point. The discharge end is provided with a second valve.

[0011] Furthermore, in some embodiments of this utility model, the cross-sectional area of ​​the internal cavity of the coal storage bin gradually increases from the feed end toward the discharge end.

[0012] Furthermore, in some embodiments of this utility model, it also includes:

[0013] A baffle is located below the feed inlet and is inclined on the inner wall of the immersion tank. The side of the baffle with higher height is connected to the inner wall of the immersion tank.

[0014] Furthermore, in some embodiments of this utility model, the number of baffles is multiple and they are spaced apart along the axial direction of the immersion tank, with adjacent baffles being staggered.

[0015] Furthermore, in some embodiments of this utility model, the baffle has a plurality of airflow holes.

[0016] Furthermore, in some embodiments of this utility model, it also includes:

[0017] A flushing pipe, one end of which is connected to the immersion tank and the other end of which is connected to the coal storage silo, and the flushing pipe is equipped with a water valve.

[0018] Furthermore, in some embodiments of this utility model, it also includes:

[0019] An aeration head is located inside the immersion tank and is connected to the flue gas inlet pipe.

[0020] Furthermore, in some embodiments of this utility model, it also includes:

[0021] A coal-water separation tank, wherein the top of the coal-water separation tank is open and located below the second valve;

[0022] A filter plate is disposed inside the coal-water separation box.

[0023] Furthermore, in some embodiments of this utility model, it also includes:

[0024] An overflow pipe is provided, with one end connected to the end of the washing tank near the feed inlet and the other end connected to the coal-water separator.

[0025] Furthermore, in some embodiments of this utility model, it also includes:

[0026] A screw conveyor, wherein the discharge end of the screw conveyor is connected to the inlet;

[0027] A feed hopper is located on and connected to the screw conveyor.

[0028] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects:

[0029] During leaching, hot flue gas and leaching liquid flow upwards and mix with the coal. The CO2 in the hot flue gas mixes with the leaching liquid to form an acidic leaching solution, which effectively deashes high-alkali coal. When unloading is required, the first valve is opened, and the leached and upgraded coal and leaching liquid fall into the coal storage silo through the feed end. Once the silo is full, the leaching liquid no longer flows from the leaching tank into the silo, preventing excessive loss of leaching liquid and ensuring sufficient leaching of the coal in the upper leaching tank. The entire process does not require grinding the coal. Furthermore, since the hot flue gas is supplied from the power plant and discharged into the atmosphere, the waste heat of the flue gas can be utilized. Higher temperatures promote the dissolution efficiency of AAEM (alkali metals and alkaline earth metals), removing chlorine in addition to alkali and alkaline earth metals. Increased temperature accelerates the dissolution of chlorine and its chemical reaction rate. Thus, under the enhanced leaching effect of hot flue gas, dealkali upgrading of wide-particle-size coal is achieved, simplifying the operation and reducing production costs. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A front view of the coal bubbling and upgrading device provided in an embodiment of this utility model;

[0032] Figure 2 A partial cross-sectional view of the coal bubbling and upgrading device provided in this embodiment of the utility model;

[0033] Figure 3 This is a top view of the baffle provided in an embodiment of the present utility model.

[0034] Icons: 1-Immersion tank; 2-Inlet; 3-Outlet; 4-Immersion liquid input pipe; 5-Flue gas input pipe; 6-Coal storage bin; 7-First valve; 8-Second valve; 9-Baffle; 10-Airflow hole; 11-Flushing pipe; 12-Water valve; 13-Aeration head; 14-Screw conveyor; 15-Feed hopper; 16-Coal-water separator; 17-Filter plate; 18-Overflow pipe. Detailed Implementation

[0035] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0036] Example 1

[0037] Please refer to Figures 1-2 This embodiment provides a coal bubbling and upgrading device for washing and upgrading wide-particle-size coal blocks to remove AAEM from the coal blocks. In this embodiment, wide-particle-size coal blocks mainly refer to coal blocks with a wide particle size range, including micrometers to centimeters, generally with a particle size width of less than 3 centimeters. It includes: a washing tank 1, a washing liquid inlet pipe 4, a flue gas inlet pipe 5, and a coal storage bin 6.

[0038] The washing tank 1 has an inlet 2 and an outlet 3, with the inlet 2 located above the outlet 3. In this embodiment, the washing tank 1 is cylindrical, with both the top inlet 2 and the bottom outlet 3 being conical. The washing tank 1 is mainly placed vertically during use and can be vertically fixed to the ground or other locations using mounting brackets. The inlet 2 at the top of the washing tank 1 is used for feeding coal blocks. The coal blocks entering the washing tank 1 through the inlet 2 are washed and upgraded before being discharged from the outlet 3.

[0039] The immersion liquid input pipe 4 is connected to the immersion tank 1. The immersion liquid input pipe 4 is used to transport the immersion liquid into the immersion tank 1. The immersion liquid flows from the discharge port 3 toward the inlet port 2 so as to mix the immersion liquid with the coal. The immersion liquid can be water or other liquids.

[0040] The flue gas inlet pipe 5 is connected to the washing tank 1. The flue gas inlet pipe 5 is used to connect to the hot flue gas pipeline discharged into the atmosphere by the power plant. The hot flue gas enters the washing tank 1 through the flue gas inlet pipe 5, and the hot flue gas flows from the discharge port 3 toward the feed port 2. During the process of the coal block moving from top to bottom, the washing liquid and hot flue gas move from bottom to top.

[0041] The coal storage bin 6 has a feed end and a discharge end. The feed end is connected to the discharge port 3, and a first valve 7 is provided at the connection point. The discharge end is provided with a second valve 8. In this embodiment, the coal storage bin 6 is used to temporarily store coal blocks and washing liquid during coal unloading.

[0042] The specific principle is as follows:

[0043] During immersion washing, both the first valve 7 and the second valve 8 are closed. Coal blocks enter the immersion washing tank 1 through the feed inlet 2 at the top of the tank. The coal blocks fall from top to bottom within the tank. Simultaneously, the immersion washing liquid is transported into the tank through the immersion washing liquid inlet pipe 4. Hot flue gas discharged from the power plant into the atmosphere is transported into the immersion washing tank 1 through the flue gas inlet pipe 5. The hot flue gas and immersion washing liquid flow from bottom to top and mix with the coal blocks. The hot flue gas contains a large amount of CO2. After mixing with the immersion washing liquid, CO2 forms an acidic washing liquid, which can effectively deash high-alkali coal blocks.

[0044] The main chemical reactions are as follows:

[0045] 1. Carbonic acid reacts with soluble organic alkali metals of ammonium acetate (such as R-COONa, (R-COO)2Ca), and the H+ ions from the carbonic acid ionize. + It can attack organic AAEMs, such as Na or Ca bound by carboxyl groups, to form soluble carbonates:

[0046]

[0047] 2. Alkali metal carbonates react with sparingly soluble inorganic alkaline earth metal salts (such as CaSO4). Raw coal or the alkali metal carbonates produced in the reaction will react with CaSO4 to form a solubility product constant K. SP With lower CaCO3 concentrations, this reaction occurs in solution and the CaCO3 products exist at the micron level in the eluent, achieving the removal of alkaline earth metals.

[0048]

[0049] 3. Carbonic acid reacts with acid-soluble inorganic alkaline earth metal salts (such as CaCO3). The solubility of CaCO3 in aqueous solution is only 0.0014 g / 100 mL, but in a carbonic acid-rich environment, it can be converted to Ca(HCO3)2, with a solubility as high as 16.6 g / 100 mL, thus achieving effective removal.

[0050]

[0051] When coal unloading is required, the first valve 7 is opened, and the washed and upgraded coal blocks fall into the coal storage silo 6 through the feed end. Simultaneously, the washing liquid in the washing tank 1 also flows into the coal storage silo 6. Once the coal storage silo 6 is full, the washing liquid stops flowing from the washing tank 1, preventing excessive loss of washing liquid and ensuring sufficient washing of the coal blocks in the upper washing tank 1. Then, the first valve 7 is closed, and the second valve 8 is opened. The temporarily stored washing liquid and coal blocks in the coal storage silo 6 can be discharged downwards through the discharge end. This process yields de-alkali-treated and upgraded coal blocks. The entire process does not require grinding the coal blocks, and because it utilizes the hot flue gas discharged from the power plant, the waste heat of the flue gas can be utilized. Higher temperatures promote higher AAEM dissolution efficiency. Thus, under the enhanced washing effect of hot flue gas, de-alkali-treated and upgraded wide-particle-size coal blocks are achieved, simplifying the operation and reducing production costs.

[0052] Furthermore, in existing technologies, some coal mined from certain mining areas has a high chlorine content. When this high-chlorine coal is burned in actual boilers, it causes serious fouling and corrosion problems, which greatly limits its utilization. Chlorine is one of the important harmful trace elements in coal. When high-chlorine coal comes into contact with water, it easily produces hydrogen chloride (HCl), which can corrode process equipment, leading to economic losses and environmental impacts. Traditional water washing can only remove water-soluble chlorine (such as NaCl, KCl, CaCl2, MgCl2, etc.) from high-chlorine coal, but cannot remove weakly bound organic exchangeable chlorine.

[0053] The coal bubbling upgrading device provided in this application can remove organic chlorine (Cl) through carbonic acid removal, and its principle is as follows:

[0054] 1. The H⁺ released from the dissociation of carbonic acid can weaken the electron cloud density of the C-Cl bond in coal, reduce the bond energy, and activate the organochlorine structure.

[0055] 2. Its conjugate base HCO3 - As a nucleophile, it replaces the chlorine atom in the C-Cl bond through a substitution reaction.

[0056] 3. The polarity of carbonic acid enhances the swelling of coal, exposing more C-Cl bonds and improving reaction contact efficiency.

[0057] 4. The substituted chlorine is eventually removed as Cl⁻ or small molecule chlorine-containing compounds, thus achieving the removal of organic Cl from coal.

[0058] Exemplary, such as Figures 1-2 As shown, in some embodiments, the cross-sectional area of ​​the internal cavity of the coal storage bin 6 gradually increases radially from the feed end to the discharge end. This results in a large opening at the bottom of the coal storage bin 6, facilitating the rapid falling and discharge of coal blocks after the second valve 8 is opened, thus improving unloading efficiency.

[0059] Example 2

[0060] like Figures 1-3 As shown, based on Embodiment 1, this embodiment further includes a baffle 9, which is located below the feed inlet 2. The baffle 9 is inclinedly disposed on the inner wall of the immersion tank 1, with the higher side of the baffle 9 connected to the inner wall of the immersion tank 1. The preferred inclination angle of the baffle 9 in this embodiment is 10-20°, and the baffle 9 is semi-circular in shape, with its arc-shaped side connected to the inner wall of the immersion tank 1. Multiple baffles 9 are provided and spaced apart along the axial direction of the immersion tank 1, with adjacent baffles 9 staggered. By providing multiple baffles 9, as the coal blocks fall from top to bottom, they will fall sequentially onto each baffle 9. The baffles 9 receive the coal blocks, slowing their descent and increasing the time they spend falling, thereby increasing the immersion time for the coal blocks to react with the immersion liquid and hot flue gas.

[0061] Exemplary, such as Figures 2-3 As shown, in some embodiments, the baffle 9 has a plurality of airflow holes 10. By providing airflow holes 10, the present invention allows air bubbles flowing from bottom to top to pass through the airflow holes 10. The flowing airflow can disturb the coal blocks accumulated on the top of the baffle 9, making it easier for the coal blocks to slide down along the top of the baffle 9, thus preventing the formation of dead zones in material accumulation.

[0062] Exemplary, such as Figures 1-2 As shown, in some embodiments, it further includes a flushing pipe 11, one end of which is connected to the washing tank 1, and the other end of which is connected to the coal storage bin 6. The flushing pipe 11 has a water valve 12. After coal unloading, some coal slag will adhere to the inner wall of the coal storage bin 6. By setting up the flushing pipe 11, after coal unloading is completed, the water valve 12 can be opened, and the washing liquid in the washing tank 1 flows into the coal storage bin 6 through the flushing pipe 11, thus flushing the coal slag adhering to the coal storage bin 6.

[0063] Exemplary, such as Figure 2 As shown, in some embodiments, it further includes an aeration head 13, which is located inside the immersion tank 1 and connected to the flue gas inlet pipe 5. In this embodiment, the aeration head 13 can be made of existing titanium dioxide through pressing. The aeration head 13 has a porous structure, and after being connected to the flue gas inlet pipe 5, it can cause the flue gas to become microbubbles, promoting solution carbonation.

[0064] Example 3

[0065] like Figures 1-2 As shown, based on Example 2, this example also includes:

[0066] The coal-water separation tank 16 has an opening at the top and is located below the second valve 8;

[0067] Filter plate 17 is disposed inside the coal-water separation box 16.

[0068] This invention, by setting up a coal-water separation tank 16 and a filter plate 17, allows coal blocks and leachate discharged from the coal storage bin 6 to fall into the coal-water separation tank 16. After being filtered by the filter plate 17, the coal blocks are located on the filter plate 17, while the leachate flows through the filter plate 17 into the coal-water separation tank 16 for collection and storage. This facilitates solid-liquid separation of the coal blocks and leachate, making it easier for the separated coal blocks to enter the next stage of leachate washing, and also facilitating the recycling and reuse of the collected leachate.

[0069] Exemplary, such as Figures 1-2 As shown, in some embodiments, it further includes an overflow pipe 18, one end of which is connected to the end of the immersion tank 1 near the feed inlet 2, and the other end of which is connected to the coal-water separation tank 16. By providing the overflow pipe 18, when the immersion liquid level in the immersion tank 1 reaches the position of the overflow pipe 18, excess immersion liquid can flow into the coal-water separation tank 16 for collection, preventing the immersion liquid level in the immersion tank 1 from exceeding a threshold.

[0070] Exemplary, such as Figures 1-2 As shown, in some embodiments, the system further includes: a screw conveyor 14, the discharge end of which is connected to the feed inlet 2; and a feed hopper 15, which is disposed on and connected to the screw conveyor 14. By providing the screw conveyor 14 and the feed hopper 15, this invention allows coal blocks to be placed in the feed hopper 15, and the screw conveyor 14 sequentially transports the coal blocks from the feed hopper 15 to the feed inlet 2, facilitating operation and saving manpower. Furthermore, the conveying speed of the screw conveyor 14 can be adjusted according to actual needs, thereby regulating the speed at which the coal blocks are fed into the washing tank 1, making operation convenient.

[0071] Optionally, the coal bubbling upgrading device of this embodiment can be used in multiple stages connected in series, allowing for multi-stage washing of the coal. The second stage uses fresh water, and the water collected after the second stage wash flows into the first stage for further washing. The multi-stage washing process is as follows: the first stage uses pure water washing to remove most water-soluble substances; the second stage uses hot flue gas to enhance water washing, focusing on removing organic substances, while fresh water flows counter-currently from the second stage to the first stage. The advantage of this design is that the counter-current process allows the raw coal to directly contact the fresh water, significantly improving mass transfer efficiency; the first stage wash uses the solution from the second stage wash, reducing overall process water consumption while ensuring overall removal efficiency.

[0072] In this specification, the terms "one embodiment," "another embodiment," "embodiment," etc., refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same term in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this utility model.

[0073] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A coal bubbling and upgrading device, characterized in that, include: An immersion tank having an inlet and an outlet, the inlet being located above the outlet; The immersion liquid inlet pipe is connected to the end of the immersion tank near the discharge port, and the immersion liquid inlet pipe is used to transport the immersion liquid into the immersion tank. A flue gas inlet pipe is connected to the immersion tank and is used to transport hot flue gas into the immersion tank. as well as A coal storage bin has a feed end and a discharge end. The feed end is connected to the discharge port, and a first valve is provided at the connection point. The discharge end is provided with a second valve.

2. The coal bubbling and upgrading device according to claim 1, characterized in that, The cross-sectional area of ​​the internal cavity of the coal storage bin gradually increases from the feed end toward the discharge end.

3. The coal bubbling and upgrading device according to claim 1, characterized in that, Also includes: A baffle is located below the feed inlet and is inclined on the inner wall of the immersion tank. The side of the baffle with higher height is connected to the inner wall of the immersion tank.

4. The coal bubbling and upgrading device according to claim 3, characterized in that, The number of baffles is multiple and they are spaced apart along the axial direction of the immersion tank, with adjacent baffles being staggered.

5. A coal bubbling and upgrading device according to claim 3, characterized in that, The baffle has several airflow holes.

6. The coal bubbling and upgrading device according to claim 1, characterized in that, Also includes: A flushing pipe, one end of which is connected to the immersion tank and the other end of which is connected to the coal storage silo, and the flushing pipe is equipped with a water valve.

7. A coal bubbling and upgrading device according to claim 1, characterized in that, Also includes: An aeration head is located inside the immersion tank and is connected to the flue gas inlet pipe.

8. A coal bubbling and upgrading device according to claim 1, characterized in that, Also includes: A coal-water separation tank, wherein the top of the coal-water separation tank is open and located below the second valve; A filter plate is disposed inside the coal-water separation box.

9. A coal bubbling and upgrading device according to claim 8, characterized in that, Also includes: An overflow pipe is provided, with one end connected to the end of the washing tank near the feed inlet and the other end connected to the coal-water separator.

10. A coal bubbling and upgrading device according to claim 1, characterized in that, Also includes: A screw conveyor, wherein the discharge end of the screw conveyor is connected to the inlet; A feed hopper is located on and connected to the screw conveyor.

Images