Blanking and conveying system of pre-combustion furnace

Abstract

The utility model relates to the field of combustion equipment, in particular to a pre-combustion furnace blanking conveying system which comprises a pre-combustion furnace and a blanking port, the pre-combustion furnace is communicated with the blanking port through a feeding system, the feeding system comprises a blanking section communicated with the blanking port, an outlet of the blanking section is connected with an inlet of a screw conveyer, and the screw conveyer is connected with the pre-combustion furnace. An outlet of the spiral conveyor is connected with an inlet of the blanking section; an outlet of the blanking section is connected with the pre-combustion furnace; compared with the prior art, the material falling section is further added behind the spiral conveyor, the risk of positive pressure heat return is reduced, the material falling section is provided with the at least two material storage mechanisms capable of being independently controlled to be opened and closed, and when the material falling section is actually used, the material storage mechanisms can be independently controlled to be opened and closed. Only one of the three-way valves can be in an open state, and positive pressure heat return is blocked to a certain extent.

Description

Technical Field

[0001] The utility model belongs to the 7.1 High-efficiency Energy-saving Industry under the 7 Energy Conservation and Environmental Protection Industry in the Strategic Emerging Industry Catalog, and relates to the field of combustion equipment, specifically to a pre-combustion furnace blanking and conveying system. Background Technique

[0002] To meet the dual-carbon goals, namely carbon peak and carbon neutrality, the decomposition furnace in thermal equipment is required to reduce the carbon content of combustion, that is, reduce the use of fuel: pulverized coal, and it is advocated to use alternative fuels. An opening is made on the side of the decomposition furnace to connect to a pre-combustion furnace. A stepped structure is arranged in the pre-combustion furnace, and the alternative fuel descends step by step on the steps, is fully burned, and finally enters the decomposition furnace.

[0003] The pre-combustion furnace is generally erected at a high place. Transporting fuel to the feeding system of the pre-combustion furnace often involves transporting the alternative fuel to a high position by a belt conveyor and feeding it into the pre-combustion furnace through the feeding system. The disadvantage is that a considerable part of the alternative fuel consists of garbage. Continuous transportation in an exposed environment results in a bad smell in the workplace and pollution.

[0004] The applicant has proposed CN2023229349617, a pre-combustion furnace fuel conveying system, in which it is proposed to seal the alternative fuel during transportation and break the seal when feeding the pre-combustion furnace, so as to reduce the exposure of the alternative fuel in the external environment and reduce pollution. In the process of "breaking the seal to feed the pre-combustion furnace", the alternative fuel falls into the lower silo through a vertical pipe and is directly fed into the pre-combustion furnace through a screw conveyor. For the pre-combustion furnace, there are not only a feed inlet and a discharge outlet, but also a combustion-supporting air inlet. Then there is a situation of positive-pressure heat return from the combustion-supporting air through the pre-combustion furnace to the screw conveyor, and there is a risk of premature combustion of the fuel during transportation. Once the fire spreads to the fuel piled up in the silo, it is easy to cause the fire to expand and burn to the main feed inlet, resulting in significant losses. Content of the Utility Model

[0005] To solve the problem of positive-pressure heat return from the pre-combustion furnace to the conveying system, the utility model provides a pre-combustion furnace blanking and conveying system.

[0006] The purpose of the utility model is achieved in the following way: A pre-combustion furnace blanking and conveying system includes a pre-combustion furnace 1 and a blanking port 2. The pre-combustion furnace 1 and the blanking port 2 are connected through a feeding system. The feeding system includes a blanking section 3 connected to the blanking port 2. The outlet of the blanking section 3 is connected to the inlet of a screw conveyor 4. The outlet of the screw conveyor 4 is connected to the inlet of a falling section 5. The outlet of the falling section 5 is connected to the pre-combustion furnace 1;

[0007] At least two independently controllable storage mechanisms 51 are arranged on the falling section 5.

[0008] The stock storage mechanism 51 is a pneumatic flap valve.

[0009] The stock storage mechanism 51 is a pneumatic double flap valve.

[0010] The blanking section 3 includes a blanking pipeline 31. The upper end of the blanking pipeline 31 is connected to the blanking port 2, the lower end of the blanking pipeline 31 is connected to the upper end of the silo 32, the lower end of the silo 32 is connected to the inlet of the screw conveyor 4, and a first plug valve 33 is arranged between the silo 32 and the screw conveyor 4.

[0011] The material dropping section 5 includes two stock storage mechanisms 51 arranged one above the other in sequence. The outlet of the stock storage mechanism 51 located below is connected to the inlet of the pre - combustion furnace 1, and a second plug valve 52 is arranged between the outlet of the stock storage mechanism 51 located below and the inlet of the pre - combustion furnace 1.

[0012] One end of the screw conveyor 4 is set as a supported section with a rotary support mechanism 41. The rotary support mechanism 41 supports the supported section and enables the other end of the screw conveyor 4 to form a rotary section that can rotate in the vertical direction. Above the rotary section, a weighing mechanism 42 is suspended. The weighing mechanism 42 is connected to the screw conveyor 4; the inlet and outlet of the screw conveyor 4 are respectively connected to the blanking section 3 and the material dropping section 5 through flexible connections;

[0013] The rotary support mechanism 41 includes a base 411. On both sides of the base 411, first hinge seats 412 are respectively arranged. The first hinge seats 412 are rotationally connected to second hinge seats 413 through a rotating shaft. The top of the second hinge seats 413 is fixedly connected to a bracket 414. On both sides of the bracket 414 along the rotation direction, support plates 415 are respectively arranged. On the top of the support plates 415, there are support grooves 4151 matching the screw conveyor 4;

[0014] On the top of the rotary section of the screw conveyor 4, a fixed hanging ear 43 is provided. The weighing mechanism 42 includes a load cell 421. The weighing end of the load cell 421 is connected to the hanging ear, the other end of the load cell 421 is connected to one end of a suspension member 422, and the other end of the suspension member 422 is connected to a support beam 44;

[0015] The flexible connection means it is connected through a flexible connection pipe 45. The flexible connection pipe 45 includes a pipe body made of soft material, and both ends of the pipe body are fixedly connected with mounting plates.

[0016] The outlet of the screw conveyor 4 is fixedly connected to the side of a single flap valve 46. The bottom of the single flap valve 46 forms a discharge port and is fixedly connected to the upper end of the flexible connection pipe 45. The lower end of the flexible connection pipe 45 is fixedly connected to the stock storage mechanism 51;

[0017] The single flap valve 46 includes a housing. Inside the housing, there is a flap matching the outlet of the screw conveyor 4. The top of the flap is fixedly connected to a rotating shaft, and both ends of the rotating shaft extend out of

[0018] the housing and are fixedly connected to one end of a cantilever. A counterweight is arranged at the other end of the cantilever.

[0019] The stock storage mechanism 51, the screw conveyor 4, the first flap valve 33, and the second flap valve 52 are all electrically connected to the main controller.

[0020] Compared with the prior art, the present utility model further adds a blanking section after the screw conveyor to reduce the risk of positive pressure heat return. At least two independently controllable stock storage mechanisms are provided on the blanking section. In actual use, only one of them can be opened to form a certain degree of blockage for positive pressure heat return. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the overall kiln furnace building;

[0022] Figure 2 is a schematic structural diagram of the pre-combustion furnace and the feeding system part;

[0023] Figure 3 is an enlarged view of the feeding system part;

[0024] Figure 4 is an enlarged view of the weighing structure part of the screw conveyor;

[0025] Figure 5 is a cross-sectional view of the outlet end of the screw conveyor;

[0026] Figure 6 is a schematic structural diagram of the rotary support mechanism.

[0027] Among them, the pre-combustion furnace 1 and the blanking port 2;

[0028] the blanking section 3, the blanking pipeline 31, the silo 32, the first flap valve 33;

[0029] the screw conveyor 4, the rotary support mechanism 41, the base 411, the first hinge seat 412, the second hinge seat 413, the bracket 414, the support plate 415, the support groove 4151, the weighing mechanism 42, the weight sensor 421, the suspension member 422, the hanging ear 43, the support beam 44, the flexible connecting pipe 45, the single flap valve 46;

[0030] the blanking section 5, the stock storage mechanism 51, the second flap valve 52. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] In the present utility model, unless otherwise clearly specified and defined, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model.

[0033] As shown in the attached Figures 1-3 As shown in the figure, a pre-combustion furnace feeding and conveying system includes a pre-combustion furnace 1 and a feeding port 2. The pre-combustion furnace 1 and the feeding port 2 are connected through a feeding system. The feeding system includes a feeding section 3 connected to the feeding port 2. The outlet of the feeding section 3 is connected to the inlet of a screw conveyor 4. The outlet of the screw conveyor 4 is connected to the inlet of a blanking section 5. The outlet of the blanking section 5 is connected to the pre-combustion furnace 1. At least two storage mechanisms 51 that can be independently controlled to open and close are provided on the blanking section 5.

[0034] For the structure of the pre-combustion furnace, refer to CN2023229349617, a pre-combustion furnace fuel conveying system. A crushing mechanism for breaking the seal of the ton bag is provided at the feeding port 2.

[0035] Compared with the above-mentioned prior art, the present utility model further adds a blanking section 5 after the screw conveyor 4 to reduce the risk of positive pressure heat return in the pre-combustion furnace 1. At least two storage mechanisms 51 that can be independently controlled to open and close are provided on the blanking section 5. In actual use, only one of them can be opened, which forms a certain degree of blockage of the positive pressure heat return. It cannot completely block the heat return, but can prevent the direct flow of heat from flushing into the feeding system.

[0036] Further, the storage mechanism 51 is a pneumatic flap valve. The pneumatic flap valve is a prior art, and the internal flap is controlled by an external cylinder to rotate upward to close or rotate downward to open.

[0037] Preferably, the storage mechanism 51 is a pneumatic double flap valve. The structure can refer to the flap valve structure of CN201822264325 7 proposed by the applicant, including two flaps whose ends contact to form a V-shaped sealing plate. A rotating shaft is fixed to the head ends of the two flaps respectively. Both ends of the rotating shaft extend out of the housing and are provided with counterweights. The "pneumatic double flap valve" changes the control of the flap from the counterweight control of the double flap valve to the cylinder control of the ordinary pneumatic flap valve in the prior art, and utilizes the effect that the double flap valve is easier to accumulate and discharge materials compared with the single flap valve.

[0038] Further, the blanking section 3 includes a blanking pipeline 31. The upper end of the blanking pipeline 31 is connected to the blanking port 2, and the lower end of the blanking pipeline 31 is connected to the upper end of the silo 32. The lower end of the silo 32 is connected to the inlet of the screw conveyor 4. A first gate valve 33 is provided between the silo 32 and the screw conveyor 4. The silo 32 preferably tapers from top to bottom to form a funnel shape, and the falling fuel accumulates in the silo 32.

[0039] Further, the material dropping section 5 includes two storage mechanisms 51 arranged in sequence from top to bottom. The outlet of the lower storage mechanism 51 is connected to the inlet of the pre-combustion furnace 1, and a second gate valve 52 is provided between the outlet of the lower storage mechanism 51 and the inlet of the pre-combustion furnace 1.

[0040] Further, as shown in the Figures 4-6 accompanying drawings, a weighing structure of a screw conveyor 4. One end of the screw conveyor 4 is provided with a rotating support mechanism 41 as a supported section. The rotating support mechanism 41 supports the supported section and enables the other end of the screw conveyor 4 to form a rotating section that can rotate in the vertical direction. The rotation axis is preferably perpendicular to the conveying direction of the screw conveyor 4. A weighing mechanism 42 is suspended above the rotating section, and the weighing mechanism 42 is connected to the screw conveyor 4. The inlet and outlet of the screw conveyor 4 are respectively flexibly connected to the feeding system and the discharging system.

[0041] By the rotating support mechanism 41 bearing part of the weight, the weighing mechanism 42 does not detect the total weight of the screw conveyor 4 and the materials therein, but reduces the burden on the weighing mechanism 42 and improves safety.

[0042] Preferably, the rotation axis of the rotating support mechanism 41 is located at the end as close as possible to the inlet of the screw conveyor 4, that is, the leftmost position in the figure, and is preferably closer to the left end than the inlet, so as to minimize the influence of the materials on the left side of the rotation axis on the measurement result.

[0043] Further, as shown in the Figure 6 accompanying drawings, the rotating support mechanism 41 includes a base 411. The base 411 is preferably fixed to the bracket of the main building. First hinge seats 412 are provided on both sides of the base 411. The first hinge seats 412 are rotationally connected to second hinge seats 413 through a rotating shaft. The top of the second hinge seat 413 is fixedly connected to a bracket 414. Support plates 415 are respectively provided on both sides of the bracket 414 along the rotation direction. A support groove 4151 matching the screw conveyor 4 is provided on the top of the support plate 415. The support groove 4151 abuts against or is fixed to the bottom of the screw conveyor 4. In actual use, although the two ends of the screw conveyor 4 are flexibly connected, there will not be much vibration, and there will not be much swing between the screw conveyor 4 and the rotating support mechanism 41. The design of the support plate 415 and the support groove 4151 is also beneficial to help the screw conveyor 4 resist the lateral wind at high altitude.

[0044] Further, a fixed hanging ear 43 is provided at the top of the rotating section of the screw conveyor 4. The weighing mechanism 42 includes a load cell 421. The weighing end of the load cell 421 is hung on the hanging ear. The other end of the load cell 421 is connected to one end of a suspension member 422. The other end of the suspension member 422 is connected to a support beam 44. The suspension member 422 can be a cable, a tension bar or other connecting members. The connections of the suspension member 422 to the load cell 421 and the support beam 44 can both be by means of a hook or a padlock.

[0045] Further, the flexible connection means a connection through a flexible connection pipe 45. The flexible connection pipe 45 includes a pipe body made of a flexible material. Both ends of the pipe body are fixedly connected to mounting discs or flange discs for screwing and fixing to rigid components.

[0046] Preferably, the material of the pipe body is refractory fiber cloth.

[0047] Further, the outlet of the screw conveyor 4 is fixedly connected to the side of a single flap valve 46. The bottom of the single flap valve 46 forms a discharge port and is fixedly connected to the upper end of the flexible connection pipe 45. The lower end of the flexible connection pipe 45 is fixedly connected to a storage mechanism 51;

[0048] The single flap valve 46 includes a housing. A flap that mates with the outlet of the screw conveyor 4 is provided inside the housing. The top of the flap is fixedly connected to a rotating shaft. Both ends of the rotating shaft extend out of the housing and are fixedly connected to one end of a cantilever. A counterweight is provided at the other end of the cantilever. A temperature sensor is provided inside the housing. When the screw conveyor 4 is not feeding, the single flap valve 46 further forms an isolation between the screw conveyor 4 and the falling material section 5.

[0049] Further, the storage mechanism 51, the screw conveyor 4, the first plug valve 33, and the second plug valve 52 are all electrically connected to a master controller.

[0050] The feeding method of the pre-combustion furnace feeding and conveying system, the method comprising the following steps:

[0051] S1. The fuel is transported to the feeding port 2 and falls into the silo 32 through the feeding pipeline 31;

[0052] S2. The first plug valve 33 is in an open state all the time. The fuel passes through the screw conveyor 4, pushes open the flap of the single flap valve 46, and falls into the upper storage mechanism 51;

[0053] S3. The upper storage mechanism 51 is opened and maintained in the open state for x seconds for discharging; then it is closed and maintained in the closed state for y seconds for receiving materials;

[0054] S4. When the upper stock storage mechanism 51 is opened, the lower stock storage mechanism 51 is in the closed state for receiving materials and remains closed within x seconds while the upper stock storage mechanism 51 remains open; when the upper stock storage mechanism 51 is completely closed, the lower stock storage mechanism 51 is opened for discharging materials and remains open within y seconds while the upper stock storage mechanism 51 remains closed. That is, when one stock storage mechanism 51 is opened or in the process of opening or closing, the other must be in the completely closed state to prevent the positive pressure heat flow from rushing upwards into the entire feeding system.

[0055] S5. Repeat S4 to make the fuel fall into the pre-combustion furnace 1.

[0056] The x seconds is 5 - 10 s, and the y seconds is 5 - 10 s, and preferably they are the same.

[0057] The overheat protection method for the pre-combustion furnace feeding and conveying system is characterized in that the method comprises the following steps:

[0058] S1. When the temperature sensor in the single flap valve 46 detects that the temperature is higher than the abnormal value, execute S2. Preferably, the abnormal value is 300 - 500 °C, indicating that there is or may be a fire in the blanking section 5.

[0059] S2. The first plug valve 33 executes the closing command, the screw conveyor 4 does not stop, and both stock storage mechanisms 51 are opened.

[0060] S2 is the first remedial measure. That is, when there is high temperature or fire in the blanking section 5, at this time, through the first plug valve 33, it is preferred to ensure that the fire does not spread to the silo 32, and the remaining materials in the screw conveyor 4 are continuously discharged into the blanking section 5 to separate the flammable substances. Since there is a pile of materials in the silo 32, it is easy to cause major disasters, so it is preferred to ensure that the high temperature or fire does not spread to the silo 32.

[0061] S3. 3 - 5 s after S2, both stock storage mechanisms 51 and the second plug valve 52 are closed synchronously, and at the same time the screw conveyor 4 remains started.

[0062] S3 is the second remedial measure. Keeping it open for 3 - 5 s hopes that the fire is small and the fuel falls into the pre-combustion furnace downward. Then closing it is when the fire is not resolved. Therefore, a multi-layer partitioned space is formed to make the fuel burn in each partitioned space and control the fire in the blanking section 5 to reduce losses.

[0063] S4. 10 - 15 s after S3, the remaining materials in the screw conveyor 4 are emptied, the screw conveyor 4 stops, and after no materials are fed in, the flap of the single flap valve 46 falls back under the influence of the counterweight to form a partition.

[0064] The above are only the preferred embodiments of the present utility model. It should be noted that for those skilled in the art, without departing from the overall concept of the present utility model, several changes and improvements can still be made, and these should also be regarded as the protection scope of the present utility model.

Claims

1. A pre-combustion furnace unloading and conveying system, comprising a pre-combustion furnace (1) and a unloading port (2), wherein the pre-combustion furnace (1) and the unloading port (2) are connected via a feeding system, and characterized in that: The feeding system comprises a material discharge section (3) connected to the material discharge port (2), the outlet of the material discharge section (3) is connected to the inlet of a screw conveyor (4), the outlet of the screw conveyor (4) is connected to the inlet of the material discharge section (5), and the outlet of the material discharge section (5) is connected to the pre-combustion furnace (1); The material dropping section (5) is provided with at least two material storage mechanisms (51) that can be independently controlled to open and close.

2. A pre-combustion furnace unloading and conveying system as claimed in claim 1, characterized in that: The material storage mechanism (51) is a pneumatic flap valve.

3. A pre-combustion furnace unloading and conveying system as claimed in claim 2, characterized in that: The material storage mechanism (51) is a pneumatic double flap valve.

4. A pre-combustion furnace unloading and conveying system as claimed in claim 1, characterized in that: The material discharge section (3) comprises a material discharge pipe (31), the upper end of the material discharge pipe (31) is connected to the material discharge port (2), the lower end of the material discharge pipe (31) is connected to the upper end of the silo (32), the lower end of the silo (32) is connected to the inlet of the screw conveyor (4), and a first gate valve (33) is provided between the silo (32) and the screw conveyor (4).

5. A pre-combustion furnace unloading and conveying system as claimed in claim 4, characterized in that: The material dropping section (5) comprises two material storage mechanisms (51) arranged in sequence above and below, the outlet of the material storage mechanism (51) located below is connected to the material inlet of the pre-combustion furnace (1), and a second gate valve (52) is arranged between the outlet of the material storage mechanism (51) located below and the material inlet of the pre-combustion furnace (1).

6. A pre-combustion furnace unloading and conveying system as claimed in claim 5, characterized in that: A rotating support mechanism (41) is provided at one end of the screw conveyor (4) as a supported section, the rotating support mechanism (41) supports the supported section and enables the other end of the screw conveyor (4) to form a rotating section that can rotate in the up-down direction, a weighing mechanism (42) is suspended above the rotating section, and the weighing mechanism (42) is connected to the screw conveyor (4); the inlet and outlet of the screw conveyor (4) are softly connected to the unloading section (3) and the blanking section (5) respectively; The rotating support mechanism (41) comprises a base (411), first hinge seats (412) are respectively arranged on both sides of the base (411), the first hinge seat (412) is rotatably connected to a second hinge seat (413) via a rotating shaft, the top of the second hinge seat (413) is fixedly connected to a bracket (414), and support plates (415) are respectively arranged on both sides of the bracket (414) along the rotation direction, and a bracket groove (4151) matching the screw conveyor (4) is arranged on the top of the support plate (415); The screw conveyor (4) has a fixed hanging ear (43) at the top of the rotating section, and the weighing mechanism (42) comprises a weighing sensor (421), the weighing end of the weighing sensor (421) is connected to the hanging ear, the other end of the weighing sensor (421) is connected to one end of a hanging member (422), and the other end of the hanging member (422) is connected to a support beam (44); The soft connection refers to connection via a soft connection pipe (45), wherein the soft connection pipe (45) comprises a pipe body made of soft material, and both ends of the pipe body are fixedly connected to the mounting plate.

7. A pre-combustion furnace unloading and conveying system as claimed in claim 6, characterized in that: The outlet of the screw conveyor (4) is fixedly connected to the side of the single flap valve (46); the bottom of the single flap valve (46) forms a material outlet and is fixedly connected to the upper end of the flexible connecting pipe (45); the lower end of the flexible connecting pipe (45) is fixedly connected to the material storage mechanism (51); The single flap valve (46) comprises a housing, a flap that matches the outlet of the screw conveyor (4) is arranged in the housing, the top of the flap is fixedly connected to the rotating shaft, and the two ends of the rotating shaft are connected from The shell extends out and fixes one end of the cantilever, and a counterweight is arranged at the other end of the cantilever.

8. A pre-combustion furnace unloading and conveying system as claimed in claim 7, characterized in that: The material storage mechanism (51), the screw conveyor (4), the first gate valve (33), and the second gate valve (52) are all electrically connected to a master controller.

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