Automatic feeding system for biomass gasifier

Abstract

The utility model belongs to the technical field of gasification furnace feeding, and particularly relates to an automatic feeding system for a biomass gasification furnace, which comprises a furnace body, a blanking valve at a feeding hole of the furnace body, a feeding unit, a material level detection unit and a control unit, the material level detection unit is arranged in the furnace body; the input end of the control unit is connected with the output end of the material level detection unit, and the output end of the control unit is electrically connected with the input end of the feeding unit. According to the feeding system, materials can be automatically fed according to the height of the materials in the gasification furnace, and the trouble degree of current manual operation is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gasifier feeding, in particular to an automatic feeding system for a biomass gasifier. Background Art

[0002] Biomass gasification is a process that uses biomass as raw material, and under the action of a gasifying agent, usually oxygen (air, oxygen-enriched or pure oxygen), water vapor or hydrogen as a gasifying agent (also called gasifying material), through a thermochemical reaction under high temperature conditions, the combustible part of the biomass is converted into combustible gas. The gas components produced during biomass gasification mainly include H2, CH4 and CO, etc. This renewable clean fuel is usually used to replace fossil energy.

[0003] Biomass fuels include agricultural and forestry wastes, such as straw, sawdust, bagasse, rice bran, etc., which are derived from agricultural and forestry wastes. The raw materials are widely distributed and diverse, low in cost, cyclically grown, and inexhaustible. They are typical circular economy projects. The biomass gasification reaction is mainly carried out in a gasifier. Usually, the crushed biomass raw materials are fed from the top of the gasifier.

[0004] The current feeding method is mainly through manual material detection. The decision of whether to feed is made based on the material level and the operating conditions of the back-end boiler equipment / gasification blower. Manual start and stop are required, which has high requirements on personnel operation. In addition, due to poor visibility in the furnace, the manual material detection method may not be accurate enough.

[0005] Therefore, the present application proposes an automatic feeding system for a biomass gasifier that can realize automatic feeding. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides an automatic feeding system for a biomass gasifier, which solves the problem that the current manual material detection method is not accurate enough and is relatively troublesome.

[0007] To achieve the above purpose, the utility model provides the following technical solutions: an automatic feeding system for a biomass gasifier, comprising a furnace body, a feeding valve at a feeding port of the furnace body and a feeding unit, and also comprising:

[0008] The material level detection unit is arranged in the furnace body;

[0009] A control unit, wherein an input end of the control unit is connected to an output end of the material level detection unit, and an output end of the control unit is electrically connected to an input end of the loading unit.

[0010] Preferably, the material level detection unit comprises a rotary paddle material level meter, which is respectively arranged on the top of the furnace body and the silo.

[0011] Preferably, the material level detection unit further includes a temperature sensor disposed in the furnace body.

[0012] Preferably, at least two rotary level control devices and / or temperature sensors are provided.

[0013] Preferably, the feeding unit includes a feeding pipe and a bucket elevator and a spiral dragon in the feeding pipe, the feeding pipe is connected to the feeding port of the furnace body, and the input ends of the bucket elevator and the spiral dragon are electrically connected to the output end of the control unit.

[0014] Preferably, it further comprises a silo, which is connected between the feed port and the feeding pipe. A feed valve is provided in the silo, and an input end of the feed valve is electrically connected to an output end of the control unit.

[0015] Preferably, it also includes control buttons, each of which is electrically connected to the bucket elevator and the spiral dragon.

[0016] Preferably, it further comprises a material tapper, which is arranged in the material bin, and the input end of the material tapper is electrically connected to the output end of the control unit.

[0017] Preferably, it further comprises an alarm unit, wherein the input end of the alarm unit is controllably connected to the output end of the control unit.

[0018] Preferably, the control unit includes a PLC module.

[0019] Compared with the prior art, the utility model provides an automatic feeding system for a biomass gasifier, which has the following beneficial effects:

[0020] The automatic feeding system for the biomass gasifier can automatically add material according to the height of the material in the gasifier, which greatly reduces the trouble of current manual operation, and the manual / automatic modes can be switched freely. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the automatic feeding system for the biomass gasifier;

[0022] Figure 2 This is the control flow chart for the automatic feeding system of biomass gasifier.

[0023] In the figure: 1. furnace body; 11. feed port; 2. discharge valve; 3. feeding unit; 31. feeding pipeline; 32. bucket elevator; 33. spiral dragon; 34. silo; 35. feed valve; 4. material level detection unit; 41. rotary level control device; 42. temperature sensor; 5. control unit; 6. control button; 7. feeder; 8. alarm unit. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-2 The utility model provides the following technical solution: an automatic feeding system for a biomass gasifier, comprising a furnace body 1, a feed valve 2 at a feed port 11 of the furnace body 1 and a feed unit 3, and also comprising:

[0026] The material level detection unit 4 is arranged in the furnace body 1;

[0027] The control unit 5 includes a PLC module. The input end of the control unit 5 is connected to the output end of the material level detection unit 4 , and the output end of the control unit 5 is electrically connected to the input end of the feeding unit 3 .

[0028] As an optional implementation scheme of the present invention, the material level detection unit 4 detects the current material level height in the furnace body 1 in real time, and triggers an electrical signal when the material level height in the furnace body 1 is too low. After receiving the electrical signal, the control unit 5 can control the unloading valve 2 to open and the loading unit 3 to load the material, so that when the material in the gasification furnace is insufficient, the material can be automatically replenished. Compared with the existing loading method of manual material detection and manual opening of each loading component, the present technical solution can greatly reduce the trouble of manual material detection and loading operations, and improve the accuracy of material height judgment. While the material is being replenished, the material level detection unit 4 can also be used to determine when to stop replenishing. Therefore, it can avoid insufficient replenishment and excessive replenishment that will cause the intermediate silo 34 to be overfilled, thereby avoiding accumulation of raw materials and blockage of the conveying channel.

[0029] Through the above structure, a feeding system is constructed which can automatically add materials according to the height of the materials in the gasifier, which greatly reduces the current manual operation and trouble.

[0030] like Figure 1-2 As shown, the material level detection unit 4 includes a rotary level control device 41 , which is respectively arranged on the top of the furnace body 1 and the material bin 34 .

[0031] As an optional implementation scheme of the present invention, the rotary resistance material level machine 41 can adopt the existing technology: CN204883397U (explosion-proof rotary resistance material level controller), CN201583848U (rotary resistance material level controller), CN201583847U (high-temperature rotary resistance material level controller), and its bottom has a sickle-shaped detection blade that can rotate in the furnace and the silo 34. When the material is sufficient, the blade is unable to rotate due to the resistance of the material, thereby generating an electrical signal to indicate that there is material in the furnace or the silo. When the material is insufficient, that is, the material height is lower than the blade, the blade can rotate due to the lack of force, thereby generating an electrical signal to indicate that there is currently insufficient material in the furnace. This is the existing technology, so this technical solution will not be described in detail here.

[0032] Through the above structure, the material level height in the furnace can be effectively collected in real time without the need for manual material detection, so it has both high accuracy and high safety.

[0033] like Figure 1-2 As shown, the material level detection unit 4 further includes a temperature sensor 42 , which is disposed in the furnace body 1 .

[0034] As an optional implementation scheme of the utility model, during actual gas production, when there is less material in the furnace, the temperature in the furnace will increase dramatically in a short period of time. Therefore, the temperature in the furnace is collected in real time through the temperature sensor 42. When the temperature increases dramatically, it can also generate an electrical signal to indicate that the material in the furnace is seriously insufficient, thereby triggering the controller to control the unloading valve 2 and the loading unit 3 to open for automatic refilling.

[0035] In this embodiment, by setting a temperature threshold and a time threshold, when the temperature change value exceeds the temperature threshold, and the time used for the temperature change meets the time threshold, and when the blades of the rotary level control device 41 start to rotate, an electrical signal is output. This makes it possible to more accurately determine the start conditions for automatic refilling, ensuring that automatic refilling is triggered only when the material in the furnace is truly insufficient.

[0036] Through the above structure, the automatic refueling function can be turned on more accurately, avoiding false alarms or abnormal reasons that trigger automatic refueling, resulting in excessive materials in the furnace and affecting the production efficiency of gas.

[0037] like Figure 1 As shown, at least two rotary level sensors 41 and / or temperature sensors 42 are provided.

[0038] As an optional implementation scheme of the utility model, multiple rotary level control devices 41 are provided to further ensure the accuracy of material level detection, thereby preventing one of the rotary level control devices 41 from inaccurately detecting the material level due to uneven material surface height. Similarly, multiple temperature sensors 42 are provided to further ensure the accuracy of temperature difference detection at different positions in the furnace.

[0039] like Figure 1-2 As shown, the feeding unit 3 includes a feeding pipe 31 and a bucket elevator 32 and a spiral dragon 33 in the feeding pipe 31. The feeding pipe 31 is connected to the feed port 11 of the furnace body 1, and the input ends of the bucket elevator 32 and the spiral dragon 33 are electrically connected to the output end of the control unit 5.

[0040] As an optional implementation scheme of the present invention, when the feeding unit 3 is in operation, the spiral dragon 33 drives the material to the bottom of the bucket elevator 32, and the bucket elevator 32 lifts the material to above the feed port 11 of the furnace body 1.

[0041] like Figure 1-2 As shown, it also includes a silo 34 , which is connected between the feed port 11 and the feeding pipe 31 . A feed valve 35 is provided in the silo 34 , and an input end of the feed valve 35 is electrically connected to an output end of the control unit 5 .

[0042] As an optional implementation scheme of the utility model, a material storage detection function can be set in the silo 34, such as a material level detection technical means, such as Figure 1 When it is detected that the material level in the furnace body 1 drops to a level that satisfies the conditions for starting the operation of the feeding unit 3, the material stored in the silo 34 drops to a certain height, triggering the feeding unit 3 to replenish the material in the silo 34 in time.

[0043] Before the feeding unit 3 is operated, the control unit 5 can first open the feed valve 35, and start the spiral dragon 33 and the bucket elevator 32, so that the material is transported to the silo 34 for pre-storage.

[0044] like Figure 2 As shown, it also includes control buttons 6, and each control button 6 is electrically connected to the bucket elevator 32 and the spiral dragon 33 respectively.

[0045] As an optional implementation scheme of the utility model, a physical control button 6 is provided to retain the function of manual material refilling, and the detection value of the material level detection unit 4 can be displayed in real time in combination with the display screen, and workers can manually perform material refilling operations according to the display screen.

[0046] like Figure 1-2 As shown, it also includes a material dispenser 7, which is arranged in the material bin 34, and the input end of the material dispenser 7 is electrically connected to the output end of the control unit 5.

[0047] As an optional implementation scheme of the utility model, the material distributor 7 is a prior art and has been widely used in the field of gasification furnace feeding. This technical scheme will not be described in detail. When the material distributor 7 is in operation, the material is evenly distributed onto the grate at the bottom of the furnace body 1 to ensure that the detection of the material level detection unit 4 is more accurate. When the control unit 5 receives an electrical signal, the material distributor 7 is turned on.

[0048] like Figure 2 As shown, an alarm unit 8 is also included, and the input end of the alarm unit 8 is controllably connected to the output end of the control unit 5. The alarm unit 8 can be a beeper, an alarm lamp, etc.

[0049] As an optional implementation scheme of the present utility model, when the material level detection unit 4 generates an electrical signal, an alarm is issued through the alarm unit 8, which can prompt the worker to check and confirm whether the conditions for refilling are currently met.

[0050] Specifically, when the temperature sensor 42 or the rotary paddle material level machine 41 detects that the material level is insufficient, an alarm is first triggered, and then the material level signal is checked. After confirmation, automatic material loading is associated to prevent malfunction or false signals.

[0051] The working principle and use process of the utility model are as follows: the material level detection unit 4 detects the current material level height in the furnace body 1 in real time, and triggers an electrical signal when the material level height in the furnace body 1 is too low. After receiving the electrical signal, the control unit 5 can control the unloading valve 2 to open and the loading unit 3 to load the material, so that the material in the gasification furnace can be directly and automatically replenished when the material is insufficient.

[0052] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An automatic feeding system for a biomass gasifier, comprising a furnace body, a feeding valve at a feeding port of the furnace body, and a feeding unit, characterized in that: Also includes: The material level detection unit is arranged in the furnace body; A control unit, wherein an input end of the control unit is connected to an output end of the material level detection unit, and an output end of the control unit is electrically connected to an input end of the loading unit.

2. The automatic feeding system for a biomass gasifier according to claim 1, characterized in that: The material level detection unit comprises a rotary paddle material level device, which is arranged on the top of the furnace body.

3. The automatic feeding system for a biomass gasifier according to claim 2, characterized in that: The material level detection unit also includes a temperature sensor, which is arranged in the furnace body.

4. The automatic feeding system for a biomass gasifier according to claim 3, characterized in that: At least two of the rotary level control devices and / or temperature sensors are provided.

5. The automatic feeding system for a biomass gasifier according to claim 1, characterized in that: The feeding unit comprises a feeding pipeline and a bucket elevator and a spiral dragon in the feeding pipeline. The feeding pipeline is connected to the feeding port of the furnace body. The input ends of the bucket elevator and the spiral dragon are electrically connected to the output end of the control unit.

6. The automatic feeding system for a biomass gasifier according to claim 5, characterized in that: It also includes a silo, which is connected between the feed port and the feeding pipeline. A feed valve is provided in the silo, and the input end of the feed valve is electrically connected to the output end of the control unit.

7. The automatic feeding system for a biomass gasifier according to claim 5, characterized in that: It also includes control buttons, each of which is electrically connected to the bucket elevator and the spiral dragon.

8. The automatic feeding system for a biomass gasifier according to claim 1, characterized in that: It also includes a material tapper, which is arranged in the material bin, and the input end of the material tapper is electrically connected to the output end of the control unit.

9. The automatic feeding system for a biomass gasifier according to claim 1, characterized in that: It also includes an alarm unit, the input end of the alarm unit is controllably connected to the output end of the control unit.

10. An automatic feeding system for a biomass gasifier according to any one of claims 1 to 9, characterized in that: The control unit includes a PLC module.

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