Constant-pressure variable circulating fluidized bed feeding device
By coordinating the feeding hopper, the unloading hopper, and the intermediate hopper, along with nitrogen positive pressure sealing and a screw conveyor, the problems of unstable feeding and blockage in constant pressure variable circulating fluidized bed were solved, achieving stable feeding and efficient gasification reaction.
Patent Information
- Application Number
- CN202522429820.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-17
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-11-17
AI Technical Summary
Traditional constant-pressure variable circulating fluidized bed feeding systems are difficult to achieve continuous and stable feeding. Air can easily enter the fluidized bed, and biomass pellets can easily become clogged, affecting operational stability and gas production quality.
The system employs a combination of an upper hopper, a lower hopper, and an intermediate hopper, along with nitrogen positive pressure sealing and a screw conveyor, to achieve continuous and stable feeding. Nitrogen is used to prevent gas backflow and reduce blockages.
It achieves continuous and stable feeding of biomass pellets, improves gasification reaction efficiency and gas production quality, reduces maintenance costs, and ensures stable operation of the constant pressure variable circulating fluidized bed.
Smart Images
Figure CN223722251U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to circulating fluidized bed feeding technology field, specifically is a kind of constant pressure variable circulating fluidized bed feeding device. BACKGROUND
[0002] In the operation process of constant pressure variable circulating fluidized bed, the performance of feeding system is crucial.
[0003] Traditional feeding system has many problems, specifically:
[0004] It is difficult to realize continuous and stable feeding, which leads to unstable operation of constant pressure variable circulating fluidized bed;
[0005] Poor sealing performance makes air easily enter the fluidized bed, affecting the efficiency of gasification reaction and gas production quality;
[0006] In the conveying process, biomass particles are prone to blockage, affecting the normal production.
[0007] With the increasing demand for efficient use of biomass energy, a constant pressure variable circulating fluidized bed feeding device is needed to solve the above problems. UTILITY MODEL CONTENT
[0008] In order to overcome the above technical problems, the purpose of the utility model is to provide a constant pressure variable circulating fluidized bed feeding device to solve the problems of traditional feeding system, such as difficult to realize continuous and stable feeding, air easily entering the fluidized bed and biomass particles prone to blockage.
[0009] The utility model provides the following technical scheme: a constant pressure variable circulating fluidized bed feeding device, comprising a feeding mechanism, the feeding mechanism comprises an upper hopper for temporary storage of raw materials at the topmost position and a lower hopper for discharging at the lowermost position;
[0010] And an intermediate hopper between the upper hopper and the lower hopper forms a raw material buffer area;
[0011] The inlet of the intermediate hopper is connected to the upper hopper by a first control valve, and the outlet of the intermediate hopper is connected to the lower hopper by a second control valve;
[0012] It also includes a feeding mechanism connected to the outlet of the upper hopper and supplying raw materials to the constant pressure variable circulating fluidized bed.
[0013] The above technical scheme is realized by using the upper hopper, lower hopper and intermediate hopper between them, which realizes continuous and stable feeding of biomass particles, reduces fluctuations during feeding and ensures stable operation of the constant pressure variable circulating fluidized bed.
[0014] As a further improvement of the utility model, the feeding mechanism further comprises a bucket elevator for aligning the discharge port with the inlet of the upper hopper to lift the raw materials.
[0015] The above technical solution is implemented to facilitate the addition of raw materials from the bottom to the inside of the upper hopper.
[0016] As a further improvement of the utility model, a movable top cover is arranged at the inlet of the upper hopper.
[0017] The above technical solution is implemented to facilitate the shielding of the inlet of the upper hopper in a non-use state.
[0018] As a further improvement of the utility model, a gate valve that needs to be manually controlled is embedded on the discharge pipe of the upper hopper.
[0019] The above technical solution is implemented to facilitate the manual closing of the discharge pipe of the upper hopper in a non-use state.
[0020] As a further improvement of the utility model, a soft connection is arranged on the first control valve between the discharge pipe of the upper hopper and the inlet of the intermediate hopper.
[0021] The above technical solution is implemented to compensate for installation errors and equipment displacement.
[0022] As a further improvement of the utility model, a gas passage for nitrogen is embedded on the intermediate hopper.
[0023] The above technical solution is implemented to form a positive pressure in the intermediate hopper by filling nitrogen, effectively prevent the backflow of gas in the constant-pressure variable circulating fluidized bed, avoid the entry of air, improve the efficiency of the gasification reaction and the quality of the produced gas, and reduce the blocking phenomenon of biomass particles during the conveying process, thereby reducing the maintenance cost and improving the production efficiency.
[0024] As a further improvement of the utility model, the gas outlet area of the gas passage is always located above the raw materials accumulated inside the intermediate hopper.
[0025] The above technical solution is implemented to avoid the excessive lifting of raw materials inside the intermediate hopper.
[0026] As a further improvement of the utility model, the feeding mechanism comprises a screw conveyor connected to the bottom end of the lower hopper and horizontally conveying the raw materials.
[0027] In addition, a flow pipe is connected between the discharge port of the screw conveyor and the constant-pressure variable circulating fluidized bed.
[0028] The above technical solution is implemented to facilitate the uniform feeding of raw materials into the constant-pressure variable circulating fluidized bed.
[0029] The technical effects and advantages of the utility model are as follows:
[0030] 1. The utility model discloses a cooperation of upper hopper, lower hopper and intermediate hopper between the two, realizes the continuous stable feeding of biomass particles, reduces the fluctuation in the feeding process, and guarantees the stable operation of constant pressure variable circulating fluidized bed.
[0031] 2. The utility model discloses that the nitrogen gas is filled in the intermediate hopper to form the positive pressure, effectively prevents the gas backflow in the constant pressure variable circulating fluidized bed, avoids the air to enter, improves the efficiency and gas production quality of gasification reaction.
[0032] 3. The drying effect of nitrogen gas in the utility model reduces the blockage phenomenon of biomass particles in the conveying process, reduces the maintenance cost, and improves the production efficiency. DRAWINGS
[0033] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description, obviously, the drawing in the following description is some embodiments of the utility model, and for those skilled in the art, under the premise of not creating laboriously, other drawings can also be obtained according to these drawings.
[0034] Figure 1 It is the front view schematic diagram of the overall structure of the utility model.
[0035] Figure 2 It is the front view schematic diagram of the upper hopper structure of the utility model.
[0036] Figure 3 It is the front view schematic diagram of the lower hopper structure of the utility model.
[0037] Figure 4 It is the front view schematic diagram of the intermediate hopper structure of the utility model.
[0038] Figure 5 It is the local section front view schematic diagram of the bucket elevator structure of the utility model.
[0039] Figure 6 It is the front view sectional schematic diagram of the feeding mechanism structure of the utility model.
[0040] Among them, the name represented by the part number in the above schematic diagram is as follows:
[0041] 100, feeding mechanism; 111, upper hopper; 1011, top cover; 1012, gate valve; 112, lower hopper; 113, intermediate hopper; 1031, gas pipeline; 1041, first control valve; 1042, second control valve; 115, bucket elevator; 200, feeding mechanism; 211, screw conveyor; 212, flow pipe; 333, constant pressure variable circulating fluidized bed; DETAILED DESCRIPTION
[0042] The technical solutions in the utility model will be described clearly and completely below with reference to the drawings in the utility model.
[0043] Embodiment:
[0044] With reference to the drawings, the utility model provides a constant pressure variable circulating fluidized bed feeding device, which is used for realizing continuous, stable and sealed feeding of biomass particle raw materials to the constant pressure variable circulating fluidized bed 333, and its core structure and feeding process are as follows:
[0045] In the feeding mechanism 100:
[0046] The upper hopper 111, the intermediate hopper 113 and the lower hopper 112 are sequentially distributed along the vertical direction and are fixed on the steel structure support of the constant pressure variable circulating fluidized bed 333 together;
[0047] The upper hopper 111 is used for temporarily storing raw materials, the top is provided with a movable top cover 1011, and the bottom discharge pipe is embedded with a gate valve 1012 (manually adjusted);
[0048] The intermediate hopper 113 is located between the upper hopper 111 and the lower hopper 112 and forms a raw material buffer area, the top of the intermediate hopper 113 is provided with a gas discharge pipeline 1031, the gas outlet is located above the raw material accumulation surface in the intermediate hopper 113 by 100-150 mm, and nitrogen gas is filled to establish positive pressure sealing;
[0049] The lower hopper 112 is connected with the screw conveyor 211 at the bottom;
[0050] The control valve is two, which are respectively a first control valve 1041 (provided with a flexible connection) between the upper hopper 111 and the intermediate hopper 113 and a second control valve 1042 between the intermediate hopper 113 and the lower hopper 112, and the first control valve 1041 and the second control valve 1042 are both pneumatic valve bodies;
[0051] The bucket elevator 115 is a ring chain elevator, the discharge port is aligned with the inlet of the upper hopper 111, and the bucket elevator 115 is used for lifting the raw materials from the ground to the upper hopper 111.
[0052] In the feeding mechanism 200:
[0053] The screw conveyor 211 is horizontally arranged, the rotating speed is adjustable, and variable feeding is realized through frequency conversion control;
[0054] One end of the flow pipe 212 is connected with the discharge port of the screw conveyor 211, and the other end is connected with the inside of the constant pressure variable circulating fluidized bed 333 (flange connection).
[0055] Specific feeding process
[0056] The biomass particles are lifted by the bucket of the bucket elevator 115 until the raw materials enter the inside of the feeding hopper 111 through the feeding port, and when the raw materials in the feeding hopper 111 reach the set material position, the bucket elevator 115 stops feeding, and the first control valve 1041 is always closed in this process to prevent the biomass particles from entering the intermediate hopper 113 in advance.
[0057] Feeding into the intermediate hopper 113: the first control valve 1041 is opened, and the biomass particles fall into the intermediate hopper 113 by gravity, and when the material position in the intermediate hopper 113 reaches a certain position, the first control valve 1041 is closed.
[0058] Feeding into the feeding hopper 112: the second control valve 1042 is opened, and the biomass particles pass through the second control valve 1042 and enter the feeding hopper 112, and when the material position in the feeding hopper 112 reaches a set value, the second control valve 1042 is closed.
[0059] Nitrogen sealing: the flow valve on the nitrogen filling and gas discharge pipeline 1031 is opened, nitrogen is filled into the intermediate hopper 113, the pressure in the intermediate hopper 113 is higher than the pressure in the constant-pressure variable circulating fluidized bed 333, a certain positive pressure difference is maintained to ensure the sealing effect.
[0060] Feeding into the gasification furnace: after the biomass particles enter the feeding hopper 112, the screw conveyor 211 below the feeding hopper 112 is started to push the biomass particles along the flow pipe 212 into the constant-pressure variable circulating fluidized bed 333, and under the push of the nitrogen positive pressure, the biomass particles smoothly enter the constant-pressure variable circulating fluidized bed 333, and when the material position in the feeding hopper 112 drops to a certain extent, the screw conveyor 211 is stopped.
[0061] The above-mentioned feeding process of the raw materials from the feeding hopper 111 to the intermediate hopper 113 to the feeding hopper 112, the nitrogen sealing of the intermediate hopper 113 and the steps of the screw conveyor 211 feeding into the constant-pressure variable circulating fluidized bed 333 are repeated to realize continuous and stable feeding.
[0062] In the description of the present specification, the description of the terms: one embodiment, example, specific example, etc. means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.
Claims
1. A constant pressure variable circulating fluidized bed feeding device, characterized in that: it comprises a feeding mechanism (100), which comprises an upper hopper (111) for temporarily storing raw materials at the topmost position and a lower hopper (112) for discharging at the lowermost position; and an intermediate hopper (113) is arranged between the upper hopper (111) and the lower hopper (112) to form a raw material buffer area; a first control valve (1041) is arranged at the inlet of the intermediate hopper (113) to connect the upper hopper (111); a second control valve (1042) is arranged at the outlet of the intermediate hopper (113) to connect the lower hopper (112); it further comprises a feeding mechanism (200) connected to the outlet of the upper hopper (111) and supplying raw materials to a constant pressure variable circulating fluidized bed (333). The feeding mechanism (100) further comprises a bucket elevator (115) whose outlet is aligned with the inlet of the upper hopper (111) to lift raw materials. An active top cover (1011) is arranged at the inlet of the upper hopper (111). A gate valve (1012) is embedded on the outlet pipe of the upper hopper (111) and needs to be manually controlled. A soft connection is arranged on the first control valve (1041) of the inlet of the intermediate hopper (113) and the outlet pipe of the upper hopper (111).
2. A constant pressure variable circulating fluidized bed feeding device according to claim 1, characterized in that: A nitrogen gas pipeline (1031) is embedded on the intermediate hopper (113) to supply nitrogen gas.
3. A constant pressure variable circulating fluidized bed feeding device according to claim 2, characterized in that: The gas outlet area of the nitrogen gas pipeline (1031) is always above the raw materials accumulated in the intermediate hopper (113).
4. A constant pressure variable circulating fluidized bed feeding device according to claim 3, characterized in that: The feeding mechanism (200) comprises a screw conveyor (211) connected to the bottom end of the lower hopper (112) and horizontally conveying raw materials; and a flow pipe (212) connecting the outlet of the screw conveyor (211) and the constant pressure variable circulating fluidized bed (333).
5. A constant pressure variable circulating fluidized bed feed device according to claim 4, characterized in that: 6. A constant pressure variable circulating fluidized bed feeding device according to claim 1, characterized in that: 7. A constant pressure variable circulating fluidized bed feed device according to claim 6, characterized in that: 8. A constant pressure variable circulating fluidized bed feeding device according to claim 1, characterized in that: