Injection tank convenient for nitrogen recovery
By setting up a floating plate in the spray tank to separate the coal powder and nitrogen space, and using the nitrogen inlet to pressurize the separation of coal powder and nitrogen, the problem of nitrogen waste and inconvenient recycling is solved, efficient recycling and reuse of nitrogen is achieved, and production costs are reduced.
Patent Information
- Application Number
- CN202422553014.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-10-22
AI Technical Summary
The existing spray tanks are wasteful and inconvenient to recycling, resulting in high production costs.
A blowing tank was designed, and a floating plate was installed inside to separate the space into coal powder space and nitrogen space. It pressurizes the nitrogen space through the nitrogen inlet, so that the floating plate rises, compresses the coal powder space, realizes the separation of nitrogen and coal powder, and facilitates nitrogen recovery.
It reduces the difficulty of purification and recycling of nitrogen, saves production costs, and improves the efficiency of nitrogen reuse.
Smart Images
Figure CN223214125U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of spray tanks, in particular to a spray tank which is convenient for recovering nitrogen. Background Art
[0002] In modern blast furnace ironmaking, pulverized coal injection (CPI) is a key means of energy conservation and consumption reduction, and an essential technology for modern blast furnaces. Pulverized coal injection (PCI) primarily involves raw coal storage and transportation, pulverized coal preparation, pulverized coal injection, hot flue gas, and air supply. The injection system is the core of this process. The injection system utilizes an injection tank. The tank uses gas pressure to transport the material, undergoing a repetitive cycle of loading, pressurizing, conveying, and depressurizing.
[0003] Because pulverized coal is flammable, the sulfiding gas used for injection is generally an inert gas, such as nitrogen, due to its high safety. The nitrogen sulfides the pulverized coal and is ejected at high speed through the injection tank. The nitrogen entering the pulverized coal conveying system ultimately has two destinations: first, it is transported with the pulverized coal into the blast furnace tuyere. Second, it enters the pulverized coal silo during the emptying of the pulverized coal injection tank. After being filtered through the bag filters on the silo roof, it is directly discharged into the atmosphere, wasting resources and increasing production costs. The nitrogen ejected from the injection tank contains a large amount of pulverized coal, making nitrogen recovery very inconvenient. The high pulverized coal content necessitates very high nitrogen filtration processes to obtain sufficiently pure nitrogen, resulting in high costs. Utility Model Content
[0004] The purpose of the utility model is to solve the above problems and to design a spray tank which is convenient for nitrogen recovery, thereby solving the problems of serious nitrogen waste and inconvenience in nitrogen recovery in existing spray tanks.
[0005] To achieve the above-mentioned objectives, the present invention provides a technical solution for a blowing tank that facilitates nitrogen recovery, comprising a blowing tank body, wherein the top of the blowing tank body is provided with a feed port and a blowing port, and the interior of the blowing tank body is provided with a floating plate that can float up and down. The floating plate divides the space inside the blowing tank body, and a pulverized coal space for accommodating pulverized coal and a nitrogen space for accommodating high-pressure nitrogen are formed above and below the floating plate, respectively. The floating plate is slidably connected to the inner wall of the blowing tank body in an up and down manner, and the bottom of the blowing tank body is provided with a nitrogen inlet and a nitrogen outlet that are connected to the nitrogen space.
[0006] A plurality of guide grooves extending up and down are provided on the inner wall of the spray tank body, and a sliding member cooperating with the guide groove is provided on the circumference of the floating plate body, and the sliding member is connected to the guide groove in an up and down sliding manner.
[0007] Preferably, the sliding member is a roller or a slider, and the roller is rotationally connected to the floating plate.
[0008] Preferably, a limiting member is provided on the inner wall of the injection tank body, the limiting member is located at the connection between the pulverized coal space and the nitrogen space, and the limiting member is located above the floating plate.
[0009] Preferably, a buffer spring is provided at the bottom of the floating plate, the upper end of the buffer spring is fixed to the bottom of the floating plate, and the lower end is fixed to the inner wall of the spray tank body.
[0010] Preferably, the spray tanks are provided in plurality, and the nitrogen outlet between two adjacent spray tanks is connected to the nitrogen inlet through a pipeline, thereby connecting the plurality of spray tanks in series.
[0011] Preferably, a valve is provided on the connecting pipe between the nitrogen inlet and the nitrogen outlet.
[0012] Compared with the prior art, the beneficial effects are:
[0013] The utility model has the advantages of simple structure and strong practicality. The floating plate divides the inner cavity of the blowing tank into two parts, the upper and lower parts. The nitrogen air below the floating plate is pressurized through the nitrogen inlet, so that the floating plate moves upward, compresses the size of the coal powder space, and increases the pressure in the coal powder space. The sulfided coal powder can be discharged through the blowing port. At the same time, the coal powder content in the nitrogen space is greatly reduced, which reduces the difficulty of purifying and recovering the nitrogen, helps to recover and reuse the nitrogen, and saves production costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the overall structure of the spray tank in Example 1;
[0015] Figure 2 Schematic diagram of the cross-sectional structure of the spray tank in Example 1;
[0016] Figure 3 Schematic diagram of the structure of the floating plate inside the spray tank in Example 1;
[0017] Figure 4 Schematic diagram of the cross-sectional structure of the spray tank in Example 2;
[0018] Figure 5 This is a connection diagram when multiple spray tanks are connected in series in Example 3.
[0019] In the figure, 1. injection tank body; 101. feed port; 102. injection port; 103. guide groove; 104. nitrogen inlet; 105. nitrogen outlet; 11. pulverized coal space; 12. nitrogen space; 2. floating plate; 3. limiter; 4. roller; 5. buffer spring; 6. valve. DETAILED DESCRIPTION
[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0021] Example 1
[0022] like Figure 1 and Figure 2 As shown, Example 1, as a preferred embodiment, proposes a spray tank that is convenient for nitrogen recovery. The spray tank mainly includes a spray tank body 1, a floating plate 2 and other components, wherein the floating plate 2 can float up and down in the inner cavity of the spray tank body 1.
[0023] The top of the spray tank body 1 is provided with a feed port 101 and a spray port 102 . The pulverized coal enters the interior of the spray tank body 1 through the feed port 101 , and the sulfided pulverized coal is sprayed out from the spray port 102 together with the nitrogen.
[0024] like Figure 2 As shown, the floating plate 2 divides the space inside the injection tank body 1 into two parts, the upper part and the lower part. The space above the floating plate 2 is the coal powder space 11 for storing sulfurized coal powder, and the space below the floating plate 2 is the nitrogen space 12 for accommodating high-pressure nitrogen.
[0025] A nitrogen inlet 104 and a nitrogen outlet 105 are provided at the bottom of the spray tank body 1 , both of which are connected to the nitrogen space 12 , while the feed port 101 and the spray port 102 at the top of the spray tank body 1 are connected to the pulverized coal space 11 .
[0026] When the sulfide pulverized coal stored in the pulverized coal space 11 needs to be discharged through the injection port 102, high-pressure nitrogen is supplied to the nitrogen space 12 through the nitrogen inlet 104 (the nitrogen outlet 105 is closed at this time). The pressure in the nitrogen space 12 rises, and the floating plate 2 and the sulfide pulverized coal (a mixture of pulverized coal and nitrogen) above the floating plate 2 are lifted upward by the high-pressure nitrogen. The size of the pulverized coal space 11 decreases, and the pressure in the pulverized coal space 11 gradually increases. The sulfide pulverized coal is discharged from the injection port 102 under the action of the pressure.
[0027] On the other hand, when pulverized coal does not need to be transported, the nitrogen inlet 104 is closed and the nitrogen outlet 105 is opened. The nitrogen in the nitrogen space 12 is discharged from the nitrogen outlet 105, and the pressure in the nitrogen space 12 decreases. The floating plate 2 will drop in height under the action of gravity, and the size of the pulverized coal space 11 will increase, so that more pulverized coal can be stored. In this way, the upper and lower spaces are separated to reduce the pulverized coal content in the nitrogen space 12 below the floating plate 2, so as to facilitate the subsequent recovery of nitrogen.
[0028] refer to Figure 2 Several guide grooves 103 are formed on the inner wall of the spray tank body 1. The guide grooves 103 extend vertically and are evenly distributed along the circumference of the spray tank body 1. Guide members are also provided around the circumference of the floating plate 2. These guide members can slide up and down along the guide grooves 103 to ensure smooth vertical movement of the floating plate 2.
[0029] like Figure 3 As shown, in this embodiment, the guide member is a roller 4 rotatably connected to the floating plate 2. The roller 4 can roll up and down along the guide groove 103 to reduce friction and facilitate smoother up and down movement of the floating plate 2. In other technical solutions, the guide member can also be a slider slidably connected up and down to the guide groove 103, with the same function.
[0030] refer to Figure 2 In order to limit the upward and downward movement of the floating plate 2, a limit member 3 is provided on the inner wall of the injection tank body 1, at the junction of the pulverized coal space 11 and the nitrogen space 12. The limit member 3 is located above the floating plate 2. When the floating plate 2 moves to the position of the limit member 3, it stops moving to prevent the floating plate 2 from hitting the top of the injection tank.
[0031] A gap exists between the edge of the floating plate 2 and the inner wall of the spray tank body 1 to prevent direct contact between the floating plate 2 and the inner wall, thereby reducing friction. This gap is sufficiently small that not much pulverized coal falls into the nitrogen space 12 below. Consequently, the pulverized coal content in the nitrogen space 12 is relatively low, and does not significantly affect nitrogen recovery within the nitrogen space 12.
[0032] The lower end of the spray tank body 1 is conical, so that if a small amount of coal powder falls into the nitrogen space 12, it can slide downward along the conical inner wall and finally be discharged from the nitrogen outlet 105.
[0033] In this embodiment, the sizes of the pulverized coal space 11 and the nitrogen space 12 are dynamically changed. This method can facilitate the transportation of sulfided coal powder above the floating plate 2 and minimize the difficulty of nitrogen recovery.
[0034] Example 2
[0035] like Figure 4As shown, this embodiment differs from Embodiment 1 in that a plurality of buffer springs 5 are installed below the floating plate 2. These buffer springs 5 are evenly distributed along the circumference of the bottom of the floating plate 2. The upper ends of the buffer springs 5 are fixed to the bottom of the floating plate 2, and the lower ends are fixed to the inner wall of the tapered end of the spray tank body 1. The buffer springs 5 act as a buffer, reducing the upward pressure on the floating plate 2, thus facilitating its upward movement. Furthermore, after the pulverized coal falls onto the floating plate 2, they slow its downward movement, preventing it from directly impacting the inner wall of the spray tank body 1.
[0036] Example 3
[0037] like Figure 5 As shown, in this embodiment, the spray tank body 1 can be provided with two, three, or more than three. Taking the four spray tanks in the figure as an example, between two adjacent spray tanks, the nitrogen inlet 104 of one spray tank is connected to the nitrogen outlet 105 of another spray tank through a pipe. In this way, the four spray tanks are connected end to end in sequence to form a closed loop. A control valve 6 is installed on each connected pipe.
[0038] During operation, the online blowing tank is in a high-pressure state, and the other blowing tanks are in a zero-pressure state. During blowing, the valve 6 is opened, and the nitrogen in the online blowing tank will automatically enter the blowing tank in the zero-pressure state through the pipeline, pressurizing the inside, pushing the floating plate 2 to move upward, promoting the discharge of coal powder, reducing the contact between nitrogen and coal powder, and helping to recover nitrogen as clean gas. In addition, by connecting multiple blowing tanks in series in this way, the recycling of nitrogen can be realized, reducing nitrogen consumption.
[0039] The above technical solutions only reflect the preferred technical solutions of the present utility model. Any changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the present utility model and fall within the scope of protection of the present utility model.
Claims
1. A spray tank for facilitating nitrogen recovery, comprising a spray tank body (1), wherein the top of the spray tank body (1) is provided with a feed inlet (101) and a spray port (102), characterized in that: A floating plate (2) capable of floating up and down is provided inside the spray tank body (1), the floating plate (2) divides the space inside the spray tank body (1), and a pulverized coal space (11) for accommodating pulverized coal and a nitrogen space (12) for accommodating high-pressure nitrogen are formed above and below the floating plate (2), respectively. The floating plate (2) is slidably connected to the inner wall of the spray tank body (1) up and down, and the bottom of the spray tank body (1) has a nitrogen inlet (104) and a nitrogen outlet (105) connected to the nitrogen space (12); A plurality of guide grooves (103) extending up and down are provided on the inner wall of the spray tank body (1); a sliding member cooperating with the guide grooves (103) is provided on the circumference of the floating plate (2) body; the sliding member is connected to the guide grooves (103) in an up and down sliding manner.
2. The spray tank for facilitating nitrogen recovery according to claim 1, characterized in that: The sliding member is a roller (4) or a slider, and the roller (4) is rotationally connected to the floating plate (2).
3. The spray tank for facilitating nitrogen recovery according to claim 1, characterized in that: A limiting member (3) is provided on the inner wall of the spray tank body (1), the limiting member (3) is located at the connection between the pulverized coal space (11) and the nitrogen space (12), and the limiting member (3) is located above the floating plate (2).
4. The spray tank for facilitating nitrogen recovery according to claim 1, characterized in that: A buffer spring (5) is provided at the bottom of the floating plate (2), the upper end of the buffer spring (5) is fixed to the bottom of the floating plate (2), and the lower end is fixed to the inner wall of the spray tank body (1).
5. The spray tank for facilitating nitrogen recovery according to claim 1, characterized in that: The spray tanks are provided in plurality, and the nitrogen outlet (105) between two adjacent spray tanks is connected to the nitrogen inlet (104) through a pipeline, thereby connecting the plurality of spray tanks in series.
6. The spray tank for facilitating nitrogen recovery according to claim 5, characterized in that: A valve (6) is provided on the connecting pipe between the nitrogen inlet (104) and the nitrogen outlet (105).