Boiler for treating silicon-containing waste gas

Abstract

The boiler for treating the silicon-containing waste gas comprises a vertical boiler body, a high-temperature cavity and a medium-low-temperature cavity are sequentially formed in the boiler body in the smoke flowing direction, and the high-temperature cavity and the medium-low-temperature cavity are vertically arranged side by side in the horizontal direction; the high-temperature cavity and the medium-low-temperature cavity are defined by membrane type walls, and shock wave soot blowers are arranged in the high-temperature cavity and the medium-low-temperature cavity. According to the boiler for treating the silicon-containing waste gas, sedimentation of silica fume is achieved through the membrane type wall and the shock wave soot blower, the silica fume is prevented from depositing and scaling in a high-temperature area, in addition, the membrane type wall and the shock wave soot blower adopt different silica fume removing modes, on the premise that a heated surface is not damaged, efficient removal of the silica fume in the boiler is completed, and the service life of the boiler is prolonged. And the membrane wall is matched with the shock wave soot blower to periodically carry out soot cleaning operation on the interior of the boiler and can be matched with the discharge valve to discharge silica fume, so that automatic soot cleaning is realized, and long-term stable operation of the boiler is ensured.

Description

Technical Field

[0001] This invention relates to the field of industrial waste gas treatment technology, and in particular to a boiler for treating silicon-containing waste gas. Background Technology

[0002] The temperature of silicon-containing waste gas is usually between 700℃ and 1100℃. Silica ash particles are in a highly viscous state that easily deposits and forms scale at temperatures above 870℃. Once they come into contact with a cooler metal wall, they quickly solidify and grow into a hard ash layer. Traditional waste heat boilers use refractory bricks or lightweight heat-resistant linings as the cavity walls, which have low thermal conductivity and high wall temperatures (>400℃). Molten silica ash easily "welds" to the wall surface, forming initial bonding nuclei. As the flue gas flows, subsequent ash particles continuously impact and sinter, forming a dense ash shell with a thickness of >50 mm at corners, tops, and flue gas turning points within a few hours.

[0003] Traditional waste heat recovery boilers are typically designed with only general dust settling and removal in mind, without specifically optimizing for the physical properties of silica in silicon-containing waste gases. This leads to the following prominent problems during operation:

[0004] Severe ash accumulation and blockage: Silica fume deposits and forms scale in high-temperature zones and solidifies and accumulates in low-temperature zones, causing rapid failure of heated surfaces, blockage of flue gas passages, and forcing boilers to shut down frequently for ash removal.

[0005] Low heat exchange efficiency: Traditional boilers do not have a reasonable zoned heat exchange structure, and cannot make full use of the physical properties of silica fume at different temperature ranges for effective heat exchange;

[0006] Difficulty in cleaning ash: Existing boilers mostly use a single rapping or steam blowing method, which has a poor effect on removing silica fume and is prone to damaging the heating surface;

[0007] High maintenance costs: It requires regular manual cleaning of ash inside the furnace, which is labor-intensive, causes long downtime, and affects the continuous operation of the system;

[0008] Large structure: Traditional boilers require an additional steel frame support system, occupying a large area, which is not conducive to the implementation of projects with limited space.

[0009] Therefore, there is an urgent need for a boiler specifically designed for silicon-containing waste gas, featuring efficient anti-clogging, automatic ash removal, and a compact structure, capable of adapting to the special operating conditions in the silicon-containing waste gas treatment process, and achieving the goals of continuous and stable operation, efficient waste heat recovery, and low maintenance costs. Summary of the Invention

[0010] To address the technical problems existing in the current boilers used for treating silicon-containing waste gas, the present invention provides a boiler for treating silicon-containing waste gas.

[0011] According to one objective of the present invention, a boiler for treating silicon-containing waste gas is provided, comprising:

[0012] The furnace body is vertical, and a high-temperature cavity and a medium-low temperature cavity are arranged sequentially along the flue gas flow direction inside the furnace body. The high-temperature cavity and the medium-low temperature cavity are arranged side by side in the horizontal direction and are both vertically arranged.

[0013] The high-temperature cavity and the medium-low temperature cavity are enclosed by a membrane wall. Both the high-temperature cavity and the medium-low temperature cavity are equipped with shock wave blowers. The medium-low temperature cavity is also equipped with a convection tube bundle that is vertically staggered from the shock wave blowers.

[0014] The bottom of the furnace body is provided with a discharge valve that connects the high-temperature cavity and the medium-low temperature cavity. The discharge valve is configured to open and close the silicon slag discharge port of the furnace body.

[0015] The furnace body is provided with an external corner tube support that can form a load-bearing frame. The corner tube support is connected to the convection tube bundle and the membrane wall respectively.

[0016] Preferably, the high-temperature cavity and the medium-low temperature cavity are connected to form a flue gas channel, with the inlet of the flue gas channel located at the lower part of the high-temperature cavity and the outlet located at the upper part of the medium-low temperature cavity;

[0017] The medium- and low-temperature cavities are multiple and interconnected, with connecting positions between adjacent cavities. The adjacent connecting positions are staggered vertically, and the connecting positions on both sides are staggered vertically with the inlet and outlet of the flue gas channel, respectively.

[0018] Preferably, the bends in the flue gas passage are all non-horizontal.

[0019] Preferably, a dust hopper is provided at the bottom of the low-temperature cavity and at the bottom of the high-temperature cavity, wherein multiple low-temperature cavities and dust hoppers are arranged in parallel;

[0020] Each of the ash hoppers is provided with a discharge valve at its bottom.

[0021] Preferably, the high-temperature cavity is surrounded by the membrane wall on all sides and the top, and the medium-low temperature cavity is surrounded by the membrane wall on all sides and the top.

[0022] The membrane wall is formed by welding finned tubes and connecting plates together, and the inner side of the membrane wall is also provided with a spray coating.

[0023] Preferably, a guide plate is provided on the membrane wall of the medium-low temperature cavity, and the guide plate forms a flue gas inlet channel facing the convection tube bundle.

[0024] Preferably, the top of the membrane wall is provided with an explosion-proof door.

[0025] Preferably, the high-temperature cavity and the medium-low temperature cavity are both divided into multiple segments in the vertical direction, and the shock wave soot blower is provided in each segment of the high-temperature cavity and the medium-low temperature cavity, and the convection tube bundle is provided in each segment of the medium-low temperature cavity.

[0026] Preferably, the corner tube support includes downcomers for heat exchange, the downcomers being connected to the convection tube bundle and the membrane wall respectively, the downcomers being supported and connected to the outside of the furnace body, and the downcomers being distributed at the corners of the furnace body on the horizontal plane.

[0027] Preferably, the unloading valve includes an upper gate and a lower gate arranged vertically from top to bottom at intervals, with the upper gate and the lower gate forming a hot ash cooling chamber;

[0028] A dust collection bin is also installed below the double-layer unloading valve.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] This boiler for treating silicon-containing waste gas adopts a multi-chamber vertical flow field structure. Based on different furnace temperatures, the furnace cavity is divided into a high-temperature cavity and a medium-low temperature cavity. The high-temperature silicon-containing waste gas enters the high-temperature cavity through the inlet flue. The waste gas is cooled by the membrane wall within the high-temperature cavity, and under gravity, the silicon ash settles to the bottom ash hopper. Simultaneously, the shock wave soot blower operates periodically to prevent silicon ash from adhering to the membrane wall of the high-temperature cavity. The waste gas, after initial settling, flows into the medium-low temperature cavity. In the medium-low temperature cavity, the waste gas exchanges heat fully with the convection tube bundle. Meanwhile, the shock wave soot blower operates, further promoting the settling of fine silicon ash particles into the lower ash hopper. Under gravity, the ash falls into the intermediate cooling chamber of the discharge valve, where the silicon slag cools naturally. Once the temperature drops to a safe level, it is discharged and collected.

[0031] The membrane wall and shock wave soot blower enable the settling of silica fume, preventing silica fume from depositing and forming scale in high-temperature zones and solidifying and accumulating in low-temperature zones, thus avoiding ash accumulation and blockage. In addition, the membrane wall and shock wave soot blower adopt different silica fume removal methods, achieving efficient removal of silica fume in the furnace without damaging the heated surfaces. The membrane wall, in conjunction with the shock wave soot blower, periodically cleans the furnace and can also be used with the discharge valve to discharge silica fume, achieving automatic cleaning and ensuring the long-term stable operation of the boiler.

[0032] The convection tube bundle and membrane wall achieve full heat exchange inside the furnace, and the absorbed waste gas heat is connected to the plant's water system in conjunction with the corner tube support, making full use of the physical properties of silica fume at different temperature ranges for effective heat exchange. The corner tube support is set outside the vertical flow field boiler and also functions as a water circulation channel and support frame, providing water cooling for the membrane wall and convection tube bundle. It eliminates the need for additional steel frame support, reducing the overall footprint and facilitating the implementation of projects with limited space.

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0034] Figure 1 This is a schematic front cross-sectional view of a boiler for treating silicon-containing waste gas according to the present invention;

[0035] Figure 2 This is a side cross-sectional view of a boiler for treating silicon-containing waste gas according to the present invention.

[0036] Figure 3 This is a top cross-sectional view of a boiler for treating silicon-containing waste gas according to the present invention. Detailed Implementation

[0037] The following description is intended to provide a detailed account of the invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0038] This invention provides a technical solution: a boiler for treating silicon-containing waste gas. Through an innovative vertical flow field partitioned heat exchange structure, membrane wall structure, multi-stage automatic ash removal system, and corner tube load-bearing design, it achieves efficient, safe, and continuous waste heat recovery of silicon-containing waste gas.

[0039] For details, please refer to Figure 1 The boiler used for treating silicon-containing waste gas includes:

[0040] A vertical furnace body 1, wherein a high-temperature cavity 101 and a medium-low temperature cavity 102 are arranged sequentially along the flue gas flow direction inside the furnace body 1. The high-temperature cavity 101 and the medium-low temperature cavity 102 are arranged side by side in the horizontal direction and are both vertically arranged.

[0041] The high-temperature cavity 101 and the intermediate-low-temperature cavity 102 are enclosed by a membrane wall 2. Both the high-temperature cavity 101 and the intermediate-low-temperature cavity 102 are equipped with shock wave blowers 3. The intermediate-low-temperature cavity 102 also contains a convection tube bundle 4 arranged vertically offset from the shock wave blowers 3.

[0042] The bottom of the furnace body 1 is provided with an ash hopper 7 that connects the high temperature cavity 101 and the medium and low temperature cavity 102. Below the ash hopper 7 is a discharge valve 5 that can open and close the silicon slag discharge outlet. Inside the discharge valve is a hot ash cooling chamber that can be opened and closed.

[0043] The boiler wall adopts a high-temperature resistant membrane wall structure 2, using high-temperature resistant materials and optimizing the thermal stress distribution on the wall surface. While ensuring airtightness and structural strength, it reduces the adhesion and deposition of silica ash on the inner side of the furnace wall, reducing the risk of high-temperature silica accumulation. Based on the physical properties of silica ash at different temperatures, the design is divided into zones: the high-temperature zone in the high-temperature cavity 101 has a large amount of ash, so a cavity structure is used to reduce silica ash deposition. Shock wave blowing is used to blow the silica ash to the ash hopper 7 below, reducing the risk of scaling; the medium-low temperature zone in the medium-low temperature cavity 102 uses dense convection tube bundles 4 to accelerate flue gas cooling and efficiently recover waste heat.

[0044] The boiler is also equipped with a multi-stage automatic ash removal system, including soot blowers arranged in sections without dead angles, a large-angle ash hopper 7, a discharge valve 5, and a stainless steel ash collection bucket, to realize automatic collection and cooling discharge of ash.

[0045] The convection tube bundle 4 has both heat exchange and load-bearing functions, eliminating the need for an external steel frame and forming a compact corner tube boiler, which significantly reduces the floor space required.

[0046] It is evident that the boiler used for treating silicon-containing waste gas has advantages such as strong anti-clogging ability, high heat exchange efficiency, convenient maintenance, and compact structure.

[0047] During use, the gas at <500℃ in the high-temperature cavity 101, after a round of cooling, is guided by the guide plate to flow vertically upward. When it flows through the medium-low temperature cavity 102, the residence time is extended due to the obstruction of the convection pipe. On the one hand, this ensures that the high-temperature exhaust gas and the heat exchange convection tube bundle 4 can fully exchange heat, so that the final flue gas temperature is <200℃. On the other hand, the silica ash is settled into the ash hopper 7 by gravity and in conjunction with the shock wave soot blower 3, so as to avoid it from adhering to the heat exchange tubes in the convection tube bundle 4 with the airflow. At the same time, the vertical flow field can reduce the scouring of the cavity wall by the high-temperature airflow and reduce the concentration of thermal stress.

[0048] See Figure 1 and 2 The high-temperature cavity 101 and the medium-low temperature cavity 102 are connected to form a flue gas channel. The inlet of the flue gas channel is located at the lower part of the high-temperature cavity 101, and the outlet is located at the upper part of the medium-low temperature cavity 102.

[0049] The number of medium and low temperature cavities 102 is multiple and interconnected. There are communication positions between adjacent cavities. The adjacent communication positions are staggered in the vertical direction. The communication positions on both sides are staggered in the vertical direction with the inlet and outlet of the flue gas channel, respectively. That is, the flue gas channel is designed as an "S" shape so that the exhaust gas can stay in the channel.

[0050] Furthermore, the inlet of the flue gas channel is tangent to the radial inner wall of the high-temperature cavity 101, so that in use, high-temperature silicon-containing waste gas can enter the high-temperature cavity 101 tangentially through the inlet of the flue gas channel.

[0051] Furthermore, the bends 'a' in the flue gas passage are all non-horizontal. Preferably, see [reference needed]. Figure 1 The bend in the flue gas passage is arc-shaped, and the angle between the two adjacent inner walls of the bend is greater than 90°. The flue gas does not make horizontal turns in the flue gas passage, thus completely eliminating the "dead zone" of ash accumulation.

[0052] In this embodiment, the furnace body 1 is provided with one high-temperature cavity 101 and two medium-low temperature cavities 102, and the inner walls of the three cavities are all equipped with membrane wall 2 cooling structures.

[0053] See also Figure 1 and 2 The bottom of the high-temperature cavity 101 is connected to an ash hopper 7, and the two medium- and low-temperature cavities 102 share an ash hopper 7. High-temperature silicon-containing waste gas at 700℃~1100℃ is introduced from the inlet of the flue gas channel. At this time, the silica fume content in the waste gas is high. Taking advantage of the gravity settling of the vertical layout in the cavity, and in conjunction with the shock wave soot blower 3, the solid substances such as silica fume in the silicon-containing waste gas are efficiently separated. The waste gas moves vertically in the cavity, which prolongs the residence time of the waste gas and ensures that the waste gas and the membrane wall 2 exchange heat fully while enhancing the separation and settling effect of the silicon-containing solid substances. The waste gas after the silica fume is separated is discharged into the next process node, and the silica fume is collected in the ash hopper 7 at the bottom.

[0054] See Figure 1 The high-temperature cavity 101 is surrounded by a membrane wall 2 on all sides and top. The membrane wall 2 is a fully sealed structure formed by continuous welding of parallel steel pipes and flat steel. The medium-low temperature cavity 102 is surrounded by a membrane wall 2 on all sides and top. It can absorb radiant heat and reduce the wall temperature, change the surface characteristics of silica fume, and reduce the risk of deposition structure.

[0055] The membrane wall 2 is formed by welding finned tubes 201 and connecting plates together to form a seamless "one-piece" furnace inner wall.

[0056] See Figure 3 Boiler water is connected inside the membrane wall 2 to cool the high-temperature silicon-containing waste gas, ensuring that the high-temperature silicon ash cools down and falls off quickly after contacting the wall surface, without forming adhesion.

[0057] The inner side of the membrane wall 2 is also provided with a spray coating to further reduce the adhesion of high-temperature silica ash.

[0058] A baffle plate is provided on the membrane wall 2 of the medium and low temperature cavity 102 to uniformly introduce flue gas into the convection tube bundle 4, avoiding local scouring and ash accumulation.

[0059] The top of the membrane wall 2 is equipped with an explosion-proof door, which automatically releases pressure when the pressure in the high-temperature zone 1 of the cavity suddenly increases, ensuring the safe operation of the boiler.

[0060] See Figure 1 and 2 The high-temperature cavity 101 and the medium-low temperature cavity 102 are vertically divided into multiple segments. Each segment of the high-temperature cavity 101 and the medium-low temperature cavity 102 is equipped with a shock wave soot blower 3, and each segment of the medium-low temperature cavity 102 is equipped with a convection tube bundle 4. The shock wave soot blower 3 is used to remove accumulated ash in segments. Water is circulated inside the convection tube bundle 4 for rapid cooling and recovery of waste heat. Specifically, the convection tube bundle 4 is connected to cold water to effectively cool the high-temperature exhaust gas.

[0061] See Figure 1 Manhole 301 is provided at the adjacent position of each shock wave soot blower 3, allowing maintenance and inspection personnel to directly enter the corresponding chamber through manhole 301 after the boiler is cooled to a safe temperature of ≤60℃, and to carry out targeted inspection and repair of problems such as nozzle wear of shock wave soot blower 3, coating peeling of membrane wall 2, and local accumulation of silica ash.

[0062] In this embodiment, the high-temperature cavity 101 and the medium-low temperature cavity 102 are each divided into three sections in the vertical direction. There are multiple shock wave soot blowers 3. At least one shock wave soot blower 3 is installed in each cavity section. The shock wave soot blower 3 and the manhole 301 are integrated into the design. The residual silicon deposits on the surface of the furnace heat exchange components and membrane wall 2 are efficiently removed by periodic shock wave energy.

[0063] The shock wave soot blower 3 is supplied with fuel and combustion air in a certain proportion. The fuel is such as propane or natural gas. The high-pressure gas generated by the combustion of the mixed gas is instantly ignited by a high-pressure igniter. The gas is reflected and vibrated on the membrane wall 2. At the same time, the high temperature softens the silica ash layer. Under the triple action, the ash falls off and is carried away by the flue gas, which is "instantaneous pressure change → shock wave → oscillation peeling".

[0064] Preferably, each cavity contains two shock wave blowers 3, and the shock wave blowers 3 in each cavity are arranged opposite each other in the radial direction of the cavity.

[0065] To address the issue that traditional boilers require an additional steel frame support system, occupy a large area, and are not conducive to the implementation of projects with limited space;

[0066] See Figure 1 and 2 The boiler adopts a corner tube structure design. The corner tube support 6 includes a large-diameter downcomer 601 for heat exchange. The downcomer 601 is connected to the convection tube bundle 4 and the membrane wall 2 respectively. After absorbing the heat of the exhaust gas, the corner tube support 6 is connected to the plant water system.

[0067] Specifically, the downcomer 601 is supported and connected to the outside of the furnace body 1. The downcomer 601 is distributed at the four corners of the furnace body 1 on the horizontal plane. The downcomer 601 is connected to the membrane wall 2 and serves as both a water circulation channel and a support frame, providing water cooling for the membrane wall 2.

[0068] The downcomer 601 serves as both a heat exchange tube and a load-bearing frame for the boiler. The external support is integrated with the downcomer 601 to form a support component. This support component also has the function of water heat exchange, eliminating the need for additional planning of brackets and water pipe installation space. This significantly improves the overall structural compactness and space utilization efficiency of the equipment, while also saving on boiler material costs.

[0069] See Figure 1 The ash hopper 7 adopts a large tilt angle design and uses the gravity self-discharge principle to avoid the retention and accumulation of silica ash in the ash hopper 7. Preferably, the tilt angle of the ash hopper 7 is ≥45°. The outlet of the ash hopper 7 is connected to a double-layer discharge valve in sequence to form an automatic ash discharge and cooling channel.

[0070] See Figure 1 The double-layer unloading valve includes an upper gate that receives and initially cools hot ash, and a lower gate that discharges cold ash into a collection bucket while isolating flue gas. A collection bucket is also provided below the double-layer unloading valve. In use, the upper gate receives and initially cools hot ash, and the lower gate discharges cold ash into the collection bucket while isolating flue gas, thus achieving airlock unloading.

[0071] Inside furnace 1, the treatment process for high-temperature silicon-containing waste gas is roughly as follows:

[0072] The high-temperature silicon-containing waste gas first enters the high-temperature cavity 101 tangentially through the inlet flue, where it undergoes pre-settling of silica ash, primary shock wave stripping, and radiative cooling by the membrane wall 2. Subsequently, it is deflected 180° by the top guide plate and flows vertically downward through two series-connected medium- and low-temperature cavities. Under the combined action of the convection tube bundle 4 and the membrane wall 2, it undergoes secondary cooling and secondary collection of silica ash. Finally, the clean flue gas is discharged from the outlet flue and enters the subsequent system. The entire process is a single vertical channel with no horizontal bends, completely eliminating the "dead zone" of ash accumulation.

[0073] Specifically, the silicon-containing waste gas is introduced from the inlet pipe located at the flue gas inlet below the boiler body, and is guided upward by the guide plate in the cavity. At this time, the waste gas has a high silica fume content. It is cooled by the membrane wall 2 in the high-temperature cavity 101. Under the action of gravity, the silica fume settles to the bottom of the large-angle conical ash hopper 7. At the same time, the shock wave soot blower 3 works periodically to prevent silica fume from adhering to the membrane wall 2 of the high-temperature cavity 101.

[0074] After initial settling, the exhaust gas flows along the top of the high-temperature cavity 101 and into the medium-low temperature cavity 102. Under the guidance of the guide plate in the medium-low temperature cavity 102, it continues to flow vertically. When it flows through the medium-low temperature cavity 102, the exhaust gas exchanges heat fully with the convection tube bundle 4. On the other hand, the shock wave soot blower 3 works, which causes the fine silica fume particles to settle further into the ash hopper 7 below.

[0075] The silica ash that settles into the steeply inclined conical ash hopper 7 falls into the intermediate cooling chamber of the discharge valve 5 under the action of gravity. After the upper gate is closed, the silica slag cools naturally in the chamber until the temperature drops to a safe temperature. Then the lower gate is opened and the silica slag is discharged into the ash collection bucket below.

[0076] Cooling water inside the corner tube support 6 enters the membrane wall 2, absorbs the heat from the exhaust gas, and is then connected to the factory's water system.

[0077] In summary, the boiler for treating silicon-containing waste gas adopts a three-chamber vertical flow field structure, which includes a vertical furnace body 1, and a discharge valve 5, a large-angle ash hopper 7, a shock wave soot blower 3, a convection tube bundle 4, and a corner tube support 6 installed on the furnace body 1. All components together form an integrated structure, realizing efficient waste heat recovery, automatic ash removal, compact structure, and long-term continuous operation of silicon-containing waste gas.

[0078] The boiler described above adopts a vertical flow field design. The advantages of a vertical flow field boiler are mainly reflected in the following aspects:

[0079] Space utilization optimization: The vertical flow field design allows the boiler to extend vertically, making full use of space. Especially in space-constrained environments, vertical flow field boilers can make more effective use of limited space resources.

[0080] Improved thermal efficiency: The vertical flow field structure facilitates the natural flow and heat exchange of flue gas and membrane wall 2 and convection tube bundle 4 in the boiler. When the flue gas flows vertically, it can exchange heat with the water cooling more fully, thereby improving the thermal efficiency of the boiler.

[0081] Compact structure: The various components of the vertical flow field boiler, such as the unloading valve 5, the large-angle ash hopper 7, the shock wave soot blower 3, the convection tube bundle 4, and the corner tube support 6, form a compact integrated structure, which not only saves space but also simplifies the installation and maintenance process.

[0082] Enhanced stability: The external support of vertical flow field boilers is usually more robust, providing better support and ensuring the stability of the boiler during operation. This reduces the risk of failure caused by vibration or external forces. At the same time, it also functions as a water circulation channel and support frame, providing water cooling for the membrane wall 2 and convection tube bundle 4.

[0083] Boilers with vertical flow field design meet the needs of various application scenarios by optimizing space utilization, improving thermal efficiency, achieving compact structure, enhancing stability and improving safety. They play an important role, especially in thermal energy conversion systems that require high efficiency, energy saving and safety.

[0084] In addition, see Figure 1 The furnace body is arranged vertically, forming a three-stage flow field from bottom to top: "cooling and unloading zone - gravity settling heat exchange zone - shock wave soot blowing zone".

[0085] Through multi-dimensional high-temperature adaptability design, it simultaneously achieves efficient waste heat recovery from high-temperature silicon-containing waste gas, control of high-temperature silica ash deposition and scaling, safe operation of high-temperature equipment, and safe slag discharge. The technical solution is highly targeted and applicable to high-temperature silicon-containing waste gas treatment scenarios, and has significant practical value and promotion prospects.

[0086] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of patent application of the present invention should not be limited by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the patent scope of the present invention.

Claims

1. A boiler for treating silicon-containing waste gas, characterized in that, include: A vertical furnace body (1) is provided with a high-temperature cavity (101) and a medium-low temperature cavity (102) arranged sequentially along the flue gas flow direction. The high-temperature cavity (101) and the medium-low temperature cavity (102) are arranged side by side in the horizontal direction and are both vertically arranged. The high-temperature cavity (101) and the medium-low temperature cavity (102) are surrounded by a membrane wall (2). Both the high-temperature cavity (101) and the medium-low temperature cavity (102) are equipped with shock wave blowers (3). The medium-low temperature cavity (102) is also equipped with a convection tube bundle (4) that is vertically staggered from the shock wave blower (3). The bottom of the furnace body (1) is provided with a discharge valve (5) that connects the high temperature cavity (101) and the medium and low temperature cavity (102). The discharge valve (5) is configured to open and close the silicon slag discharge port of the furnace body (1). The furnace body (1) is provided with a corner tube support (6) that can form a load-bearing frame. The corner tube support (6) is connected to the convection tube bundle (4) and the membrane wall (2).

2. The boiler for treating silicon-containing waste gas according to claim 1, characterized in that, The high-temperature cavity (101) and the medium-low temperature cavity (102) are connected to form a flue gas channel. The inlet of the flue gas channel is located at the lower part of the high-temperature cavity (101), and the outlet is located at the upper part of the medium-low temperature cavity (102). The number of medium and low temperature cavities (102) is multiple and interconnected. There are communication positions between adjacent cavities. The adjacent communication positions are staggered in the vertical direction. The communication positions on both sides are staggered in the vertical direction with the inlet and outlet of the flue gas channel, respectively.

3. The boiler for treating silicon-containing waste gas according to claim 2, characterized in that, All bends (a) in the flue gas passage are not horizontal.

4. The boiler for treating silicon-containing waste gas according to claim 2, characterized in that, A hopper (7) is provided at the bottom of the low-temperature cavity (102) and the bottom of the high-temperature cavity (101), and multiple low-temperature cavities (102) and hoppers (7) are arranged in parallel. Each of the ash hoppers (7) is provided with a discharge valve (5) below it.

5. The boiler for treating silicon-containing waste gas according to claim 1, characterized in that, The high-temperature cavity (101) is surrounded by the membrane wall (2) on all sides and on the top. The medium-low temperature cavity (102) is also surrounded by the membrane wall (2) on all sides. The membrane wall (2) is formed by welding finned tubes (201) and connecting plates. The inner side of the membrane wall (2) is also provided with a spray coating.

6. The boiler for treating silicon-containing waste gas according to claim 1, characterized in that, A guide plate is provided on the membrane wall (2) of the medium-low temperature cavity (102), and the guide plate forms a flue gas introduction channel facing the convection tube bundle (4).

7. The boiler for treating silicon-containing waste gas according to claim 1, characterized in that, The top of the membrane wall (2) is equipped with an explosion-proof door.

8. The boiler for treating silicon-containing waste gas according to claim 1, characterized in that, The high-temperature cavity (101) and the medium-low temperature cavity (102) are divided into multiple segments in the vertical direction. The shock wave soot blower (3) is provided in each segment of the high-temperature cavity (101) and the medium-low temperature cavity (102). The convection tube bundle (4) is provided in each segment of the medium-low temperature cavity (102).

9. The boiler for treating silicon-containing waste gas according to claim 1, characterized in that, The corner tube support (6) includes a downcomer (601) for heat exchange, which is connected to the convection tube bundle (4) and the membrane wall (2) respectively. The downcomer (601) is supported and connected to the outside of the furnace body (1) and is distributed at the corner of the furnace body (1) on the horizontal plane.

10. The boiler for treating silicon-containing waste gas according to claim 1, characterized in that, The unloading valve (5) includes an upper gate and a lower gate arranged vertically from top to bottom at intervals, and the upper gate and the lower gate form a hot ash cooling chamber; A dust collection bin is also installed below the double-layer unloading valve.

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