A well-type heating furnace tail gas collection device and collection method, and a well-type heating furnace

Abstract

The present invention discloses a tail gas collection device for a pit-type heating furnace, comprising: a cover body and a tail gas collection mechanism; the cover body comprises a cover body cover, a circumferential outer wall shell, a partition and a cushion block, the partition is located directly below the cover body cover, the cover body cover and the partition are both annular plates, having a hollow inner ring matching the size of the furnace cover of the pit-type heating furnace, and a ventilation hole is provided on the partition; the circumferential outer wall shell is located at the periphery of the cover body cover and the partition, and has a lower end for connecting with the furnace body of the pit-type heating furnace, the cushion block is provided at the lower end, and the circumferential outer wall shell is provided with a mounting hole; the tail gas collection mechanism comprises a main pipe, a branch pipe and an exhaust collection device, the branch pipe is located at the mounting hole, one end of the main pipe is connected to the branch pipe, and the other end is connected to the exhaust collection device. The present invention collects oil smoke in the initial diffusion stage, and the purification treatment efficiency is high and the system energy consumption is low.

Description

Technical Field

[0001] The present invention relates to the technical field of tail gas collection, and in particular to a tail gas collection device and collection method for a well-type heating furnace, and a well-type heating furnace. Background Art

[0002] The pit-type heating furnace is used for uniform annealing, tempering, heating and other heat treatments of general metal parts at low temperatures. It is a conventional tempering treatment equipment with good tempering effect and relatively energy-saving. It can also perform stress relief or annealing heat treatment. It is mainly composed of furnace shell, furnace lining, heating element, furnace tank, air guide tube, furnace cover, furnace cover lifting and rotation (or translation) system, circulating fan and other parts. The oil fume of the pit-type heating furnace is directly discharged at the operation site, which seriously affects the air cleanliness of the heat treatment site and pollutes the working environment and atmospheric system. The oil fume is absorbed by the people on site, which will directly damage the health of the personnel. After long-term accumulation, it will lead to many occupational diseases, such as respiratory tract infection, asthma, silicosis, etc. Therefore, the oil fume generated by the pit-type heating furnace must be purified and discharged outdoors.

[0003] The development and application of oil fume purification equipment at home and abroad has been relatively extensive, and the purification system is becoming more mature. However, it is difficult to achieve targeted and efficient collection of oil fume exhaust generated by typical heating equipment. The main reason is that the environment around the equipment is complex and there are many interference conditions under the operating conditions. At home and abroad, many large smoke and dust collection hoods are installed on the top of the equipment to achieve large-scale oil fume collection and treatment. This method collects and treats oil fume in a large-scale diffusion stage. During the treatment, high-power equipment is required to clean up a large range of exhaust gas, and the purification efficiency is low.

[0004] Therefore, how to develop a well-type heating furnace tail gas collection device and collection method with high purification efficiency and low system energy consumption has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to provide a well-type heating furnace exhaust gas collection device and collection method, and a well-type heating furnace, which can collect oil smoke in the initial diffusion stage to achieve efficient exhaust gas capture with a smaller structure, with good oil fume collection effect, high purification efficiency and low system energy consumption.

[0006] In order to achieve the above-mentioned object, the present invention provides a tail gas collection device for a well-type heating furnace, comprising: a cover body and a tail gas collection mechanism;

[0007] The cover body comprises a cover body cover, a circumferential outer wall shell, a partition and a cushion block, wherein the partition is located directly below the cover body cover, and both the cover body cover and the partition are annular plates, each of which has a hollow inner ring matching the size of the furnace cover of the pit-type heating furnace, and the partition is provided with a ventilation hole; the circumferential outer wall shell is located at the periphery of the cover body cover and the partition, and has a lower end portion for connecting with the furnace body of the pit-type heating furnace, the cushion block is provided at the lower end portion, and the circumferential outer wall shell is provided with a mounting hole;

[0008] The exhaust gas collection mechanism includes a main pipe, a branch pipe and an exhaust collection device. The branch pipe is located at the mounting hole and is connected to the inside of the cover body. One end of the main pipe is connected to the branch pipe, and the other end is connected to the exhaust collection device.

[0009] Further, the mounting hole includes a first mounting hole and a second mounting hole, the partition separates the circumferential outer wall shell into an upper part and a lower part, the first mounting hole is located at the upper part of the circumferential outer wall shell, and the second mounting hole is located at the lower part of the circumferential outer wall shell; the branch pipe includes a first branch pipe and a second branch pipe, the first branch pipe is located at the first mounting hole, and the second branch pipe is located at the second mounting hole, and the first branch pipe and the second branch pipe are both connected to the main pipe.

[0010] Furthermore, there are a plurality of ventilation holes on the partition plate, and the apertures of the ventilation holes increase in a step-by-step manner from the side close to the branch pipe to the side far from the branch pipe.

[0011] Furthermore, the total hole area of ​​the plurality of ventilation holes is equal to the hole area of ​​the first branch pipe.

[0012] Furthermore, the number of the ventilation holes is 12 to 26.

[0013] Furthermore, the first branch pipe, the second branch pipe and the main pipe are all circular pipes, the aperture area of ​​the first branch pipe is 0.5 to 0.8 times the aperture area of ​​the main pipe, and the aperture area of ​​the first branch pipe is 0.8 to 1 times the aperture area of ​​the second branch pipe.

[0014] Furthermore, the gasket block is a plurality of gaskets, and the plurality of gaskets are evenly distributed along the circumference of the lower end portion of the circumferential outer wall shell.

[0015] Furthermore, the gasket has a thickness of 5 mm to 10 mm.

[0016] The present invention also provides a pit-type heating furnace, comprising a furnace cover, a furnace body and a furnace cover rotating shaft, and also comprising the exhaust gas collection device. The furnace cover and the furnace body are rotatably connected through the furnace cover rotating shaft. The furnace cover rotating shaft comprises a lifting rod, a lifting pump connected to the bottom of the lifting rod, and a lifting plate connected to the top of the lifting rod. The furnace cover and the cover body are both fixedly connected to the lifting plate.

[0017] The present invention also provides a tail gas collection method using the tail gas collection device for a well-type heating furnace, the method comprising:

[0018] Open the furnace cover on the well-type heating furnace body, and the exhaust gas first enters the lower space of the partition in the cover body, then enters the upper space of the partition, and then enters the exhaust collection device through the branch pipe and the main pipe.

[0019] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0020] The present invention provides a well-type heating furnace exhaust gas collection device and collection method, in which a cover body and an exhaust gas collection mechanism cooperate with each other, and the exhaust gas first enters the lower space of the partition in the cover body, then enters the upper space of the partition, and then enters the exhaust collection device through the branch pipe and the main pipe. By collecting the oil smoke in the initial diffusion stage, efficient exhaust gas capture is achieved with a smaller structure, the oil smoke collection effect is good, the purification treatment efficiency is high and the system energy consumption is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic structural diagram of a well-type heating furnace tail gas collection device provided in Example 1 of the present invention;

[0023] Figure 2 is a cross-sectional view of a well-type heating furnace tail gas collection device provided in Example 1 of the present invention;

[0024] Figure 3 is a top view of a well-type heating furnace tail gas collection device provided in Example 1 of the present invention;

[0025] Figure 4 This is a schematic diagram of the partition structure of a well-type heating furnace tail gas collection device provided in Example 1 of the present invention;

[0026] Figure 51 is a schematic diagram of the structure of an exhaust gas collection device for a well-type heating furnace exhaust gas collection device provided in Example 1 of the present invention; wherein (A) is a front view of the structure; (B) is a left view of the pipe structure;

[0027] 1. hood body; 11. hood body cover; 12. circumferential outer wall shell; 121. lower end; 13. partition; 131. ventilation hole; 14. cushion block; 15. mounting hole; 151. first mounting hole; 152. second mounting hole; 2. exhaust gas collection mechanism; 21. main pipe; 22. branch pipe; 221. first branch pipe; 222. second branch pipe; 23. exhaust collection device; 3. furnace cover; 4. furnace body; 5. furnace cover rotating shaft; 51. lifting rod; 52. lifting pump; 53 lifting plate. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below in conjunction with specific implementations and examples, and the advantages and various effects of the present invention will be more clearly presented. It should be understood by those skilled in the art that these specific implementations and examples are used to illustrate the present invention, rather than to limit the present invention.

[0029] Throughout the specification, unless otherwise specifically stated, the terms used herein should be understood as meanings commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. In the event of a conflict, the present specification takes precedence.

[0030] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0031] In order to solve the above technical problems, the applicant first designed the structure of Comparative Example 1 of the present invention:

[0032] The cover body of the comparative example 1 does not include the cover plate in the embodiment 1, and the position of the cover body cover is located at the position of the cover plate in the embodiment 1.

[0033] As a result, the oil fume collection effect is not good, and the purification efficiency can only reach about 75%. The energy consumption of the system is the same as that of Example 1, and the power of the oil fume purification host is 3 kilowatts.

[0034] To this end, the applicant has made further improvements:

[0035] The technical solution provided by the embodiment of the present invention is to solve the above technical problems, and the overall idea is as follows:

[0036] According to a typical embodiment of the present invention, an embodiment of the present invention provides a tail gas collection device for a pit-type heating furnace, comprising: a cover body 1 and a tail gas collection mechanism 2;

[0037] The cover body 1 includes a cover body cover 11, a circumferential outer wall shell 12, a partition 13 and a cushion block 14. The partition 13 is located directly below the cover body cover 11. The cover body cover 11 and the partition 13 are both annular plates. The annular plates have a hollow inner ring that matches the size of the furnace cover of the pit-type heating furnace. The partition 13 is provided with a ventilation hole 131; the circumferential outer wall shell 12 is located at the periphery of the cover body cover 11 and the partition 13, and has a lower end 121 for connecting with the furnace body of the pit-type heating furnace. The cushion block 14 is provided at the lower end 121, and the circumferential outer wall shell 12 is provided with a mounting hole 15;

[0038] The exhaust gas collection mechanism 2 includes a main pipe 21 , a branch pipe 22 and an exhaust collection device 23 . The branch pipe 21 is located at the mounting hole 15 . One end of the main pipe 21 is connected to the branch pipe 22 , and the other end is connected to the exhaust collection device 23 .

[0039] The reasons why the well-type heating furnace tail gas collection device can solve the above technical problems are:

[0040] The applicant has found that since the tail gas first enters the lower space of the partition in the cover body and then enters the upper space of the partition (entering through the ventilation holes provided on the partition), by collecting the oil smoke in the initial diffusion stage, efficient tail gas capture is achieved with a smaller structure, the oil smoke collection effect is good, the purification treatment efficiency is high and the system energy consumption is low. The pipeline system of the present invention has a simple structure, is easy to manufacture and use, and has a wide range of applicability. The present invention solves the problem of low overflow collection rate of tail gas from a well-type heating furnace, and is particularly suitable for equipment with a fixed and specific shape and a relatively long and concentrated flue.

[0041] Preferably, the mounting hole 15 includes a first mounting hole 151 and a second mounting hole 152, the partition 13 separates the circumferential outer wall shell 12 into an upper part and a lower part, the first mounting hole 151 is located at the upper part of the circumferential outer wall shell, and the second mounting hole 152 is located at the lower part of the circumferential outer wall shell; the branch pipe 22 includes a first branch pipe 221 and a second branch pipe 222, the first branch pipe 221 is located at the first mounting hole 151, and the second branch pipe 222 is located at the second mounting hole 152, and the first branch pipe 221 and the second branch pipe 222 are both connected to the main pipe 21.

[0042] In this way, the exhaust gas in the upper space of the partition in the cover body 1 enters the exhaust collection device through the first branch pipe 221 and the main pipe. The exhaust gas in the lower space of the partition in the cover body enters the exhaust collection device through the second branch pipe 222 and the main pipe.

[0043] The opening diameters of the first mounting hole 151 and the second mounting hole 15 are respectively slightly smaller than 2 mm of the corresponding first branch pipe 221 and second branch pipe 222. When the furnace door is closed, the collision between the cover body and the first branch pipe 221 and the second branch pipe 222 can play a limiting role.

[0044] Preferably, the first branch pipe 221, the second branch pipe 222 and the main pipe 22 are all circular pipes. The aperture area of ​​the first branch pipe is 0.5 to 0.8 times the aperture area of ​​the main pipe, and the aperture area of ​​the first branch pipe is 0.8 to 1 times the aperture area of ​​the second branch pipe. The reason for this arrangement is: since the total air extraction is carried out through the main pipe, the two branches (the first branch pipe and the second branch pipe) are diverted. Considering the loss, the air extraction volume of the first branch pipe is small, and the air extracted by the first branch pipe is overflowed oil smoke, and the amount of oil smoke is slightly less than that of the second branch pipe. Combined with the total air extraction capacity, the two branches are appropriately allocated, and then the wind speed of each pipeline is basically the same.

[0045] Preferably, there are multiple ventilation holes 131 on the partition 13, and the aperture of the ventilation holes 131 increases stepwise from the side close to the branch pipe 22 to the side far from the branch pipe 22. This is conducive to achieving basically consistent wind pressure effects for smoke collection at each position. More preferably, the total hole area of ​​the multiple ventilation holes 131 is equal to the hole area of ​​the first branch pipe 221. This is conducive to achieving maximum collection of smoke. Preferably, the ventilation holes in this embodiment are 12 to 26.

[0046] Preferably, the gasket 14 is a plurality of gaskets, and the plurality of gaskets are evenly distributed along the circumference of the lower end portion of the circumferential outer wall shell. More preferably, the thickness of the gasket is 5 mm to 10 mm. In this embodiment, the gasket 14 is 4 evenly distributed circular gaskets. The cover body supports the upper end surface of the furnace body 4 of the pit-type heating furnace through the gasket 14 to achieve the effect of limiting the up and down movement. The gap between the cover body and the upper end surface of the furnace body 4 of the pit-type heating furnace can be adjusted by the thickness of the gasket 14 to provide an air inlet after the purification system is started. If the thickness of the gasket 14 is too small, the air intake speed will be low and the purification efficiency will be low; if the thickness of the gasket 14 is too large, the exhaust gas and smoke will overflow and the collection efficiency will be reduced.

[0047] According to another typical embodiment of the present invention, the present invention provides a pit type heating furnace, such as Figure 1 As shown, it includes a furnace cover 3, a furnace body 4 and a furnace cover rotating shaft 5, and also includes the exhaust gas collecting device. The furnace cover 3 and the furnace body 4 are rotatably connected through the furnace cover rotating shaft 5. The furnace cover rotating shaft 5 includes a lifting rod 51, a lifting pump 52 connected to the bottom of the lifting rod, and a lifting plate 53 connected to the top of the lifting rod. The furnace cover 3 and the cover body 1 are fixedly connected to the lifting plate 53.

[0048] When in use, the partition 13 and the cushion block 14 are first welded and assembled on the upper cover 11 to form the cover 1, and then the cover 1 and the furnace cover 3 of the pit type heating furnace are welded together. The furnace cover rotating shaft 5 can drive the welded cover 1 and the furnace cover 3 of the pit type heating furnace to rise and fall, and rotate to open the furnace body 4 of the pit type heating furnace.

[0049] According to another typical implementation of the present invention, an embodiment of the present invention provides a collection method, comprising the following steps:

[0050] Open the furnace cover on the well-type heating furnace body, and the exhaust gas first enters the lower space of the partition in the cover body, then enters the upper space of the partition, and then enters the exhaust collection device through the branch pipe and the main pipe.

[0051] A collection method of the present application will be described in detail below in combination with embodiments, comparative examples and experimental data.

[0052] Example 1

[0053] 1. A well-type heating furnace tail gas collection device

[0054] A. Flow channel structure design steps:

[0055] like Figure 4 As shown, the partition 13 is an annular circular plate with holes on the plate to allow the exhaust gas to pass through; the holes are evenly distributed, the hole diameters are gradually changing and the hole diameters are larger at the far end of the pipeline component. There are 12 holes, so that the wind pressure effect of collecting smoke at each position is basically the same; the total area of ​​the holes is calculated to be equal to the cross-sectional area of ​​the first branch pipe 221, which plays a buffering role and achieves the maximum collection of smoke.

[0056] like Figure 5 (A) and Figure 5 As shown in (B), the first branch pipe 221 is a circular thin-walled steel pipe, with a radius of 0.8 times that of the main pipe 21 and a cross-sectional area of ​​0.64 times that of the main pipe 21; the radius is equal to that of the second branch pipe 222, and the cross-sectional area is 1 times that of the second branch pipe 222. Considering the loss, the wind speed of each pipeline is basically the same.

[0057] B. Cover Limitation Steps

[0058] The cover body supports the end face of the furnace body 4 of the pit-type heating furnace through the pad 14 to achieve the effect of limiting the up and down movement. The pad 14 is 4 evenly distributed circular pads with a diameter of 50mm and a thickness of 5mm to 10mm. The gap between the cover body 1 and the end face of the furnace body 4 of the pit-type heating furnace is adjusted by the thickness of the pad 14 to provide an air inlet after the purification system is started. If the thickness of the pad 14 is too small, the air intake speed will be low and the purification efficiency will be low; if the thickness of the pad 14 is too large, the exhaust gas and dust will overflow and the collection efficiency will be reduced.

[0059] C. Steps for assembling the cover and pipeline components:

[0060] Close the furnace door to determine the corresponding opening positions of the first branch pipe 221 and the second branch pipe 222 of the pipeline component, and open the first installation hole 151 and the second installation hole 152 at the corresponding positions of the circumferential outer wall shell 12. The opening diameters are slightly smaller than the corresponding first branch pipe 221 and second branch pipe 222 by 2 mm. Figure 3 As shown, the pipeline component is near the furnace cover rotating shaft 5. When the furnace door is closed, the cover body collides with the pipeline component to play a limiting role.

[0061] 2. A method for collecting tail gas from a well-type heating furnace:

[0062] Open the furnace cover 3 on the furnace body of the pit-type heating furnace, and the tail gas first enters the lower space of the partition in the cover body, then enters the upper space of the partition, and then enters the exhaust collection device through the branch pipe and the main pipe.

[0063] The oil fume collection effect is good, the purification efficiency reaches more than 95%, and the system energy consumption is low. The power of the oil fume purification host is 3 kilowatts.

[0064] Comparative Example 1

[0065] A tail gas collection device for a well-type heating furnace in the comparative example comprises: a cover body and a tail gas collection mechanism;

[0066] The cover body of the comparative example does not include the cover plate in the first embodiment, and the position of the cover body cover is located at the position of the cover plate in the first embodiment.

[0067] The oil fume collection effect in this comparative example is not good, and the purification efficiency can only reach about 75%. The energy consumption of the system is the same as that of Example 1, and the power of the oil fume purification host is 3 kilowatts.

[0068] Comparative Example 2

[0069] This comparative example is a conventional tail gas collection device for a pit-type heating furnace in the prior art, and its structure is to set a large-area rotating smoke extraction hood more than 2 meters above the pit-type heating furnace.

[0070] In this comparative example, the purification efficiency is about 70%, the operation is cumbersome, which affects the parts transfer time and thus the product quality, and the system has high energy consumption, and the power of the oil fume purification host is more than 50 kilowatts.

[0071] Finally, it should be noted that the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements that are inherent to such process, method, article, or apparatus.

[0072] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0073] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A well-type heating furnace tail gas collection device, characterized in that: include: Hood and exhaust gas collection mechanism; The cover body comprises a cover body cover, a circumferential outer wall shell, a partition and a cushion block, wherein the partition is located directly below the cover body cover, and both the cover body cover and the partition are annular plates, each of which has a hollow inner ring matching the size of the furnace cover of the pit-type heating furnace, and the partition is provided with a ventilation hole; the circumferential outer wall shell is located at the periphery of the cover body cover and the partition, and has a lower end portion for connecting with the upper end of the furnace body of the pit-type heating furnace, the cushion block is provided at the lower end portion, and the circumferential outer wall shell is provided with a mounting hole; The exhaust gas collection mechanism includes a main pipe, a branch pipe and an exhaust collection device, wherein the branch pipe is located at the mounting hole and is connected to the inside of the cover body, one end of the main pipe is connected to the branch pipe, and the other end is connected to the exhaust collection device; The mounting hole includes a first mounting hole and a second mounting hole, the partition plate divides the circumferential outer wall shell into an upper part and a lower part, the first mounting hole is located at the upper part of the circumferential outer wall shell, and the second mounting hole is located at the lower part of the circumferential outer wall shell; the branch pipe includes a first branch pipe and a second branch pipe, the first branch pipe is located at the first mounting hole, the second branch pipe is located at the second mounting hole, and the first branch pipe and the second branch pipe are both connected to the main pipe; There are multiple ventilation holes on the partition, and the diameters of the ventilation holes increase stepwise from the side close to the branch pipe to the side far away from the branch pipe; The first branch pipe, the second branch pipe and the main pipe are all circular pipes, the aperture area of ​​the first branch pipe is 0.5 to 0.8 times the aperture area of ​​the main pipe, and the aperture area of ​​the first branch pipe is 0.8 to 1 times the aperture area of ​​the second branch pipe; The gaskets are multiple circular gaskets evenly distributed along the circumference of the lower end of the circumferential outer wall shell. The thickness of the gaskets is 5mm to 10mm. The end face gap between the cover body and the well-type heating furnace body is adjusted by the thickness of the gaskets to provide an air inlet after the purification system is started.

2. The tail gas collection device for a well-type heating furnace according to claim 1, characterized in that: The total hole area of ​​the plurality of ventilation holes is equal to the hole area of ​​the first branch pipe.

3. The tail gas collection device for a well-type heating furnace according to claim 1 is characterized in that: The number of the ventilation holes is 12 to 26.

4. A pit type heating furnace, characterized in that: It includes a furnace cover, a furnace body and a furnace cover rotating shaft, and also includes the exhaust gas collection device described in any one of claims 1-3, the furnace cover and the furnace body are rotatably connected through the furnace cover rotating shaft, the furnace cover rotating shaft includes a lifting rod, a lifting pump connected to the bottom of the lifting rod, and a lifting plate connected to the top of the lifting rod, and the furnace cover and the cover body are fixedly connected to the lifting plate.

5. A method for collecting tail gas using the pit-type heating furnace according to claim 4, characterized in that: The method comprises: Open the furnace cover on the well-type heating furnace body, and the exhaust gas first enters the lower space of the partition in the cover body, then enters the upper space of the partition, and then enters the exhaust collection device through the branch pipe and the main pipe.

Images