Industrial silicon smelting flue gas purification system

Abstract

The utility model discloses a flue gas purification system for industrial silicon smelting, which aims at solving the technical problem of providing conditions for reducing the frequency of air distribution operation by improving the flue gas purification system for industrial silicon smelting. Comprising a flue gas cooling device used for receiving industrial silicon furnace flue gas discharged by an industrial silicon furnace and outputting to-be-purified flue gas cooled to the temperature lower than or equal to C1 DEG C when the flue gas cooling device and the industrial silicon furnace operate normally; a flue gas dust removal device; a flue gas desulfurization device; a flue gas denitration device; a flue gas driving device; the flue gas dust removal device can tolerate C2 DEG C when the flue gas cooling device is in a normal working state, and the value obtained by subtracting C1 from C2 is larger than or equal to 100 DEG C or larger than or equal to 120 DEG C or larger than or equal to 150 DEG C or larger than or equal to 200 DEG C. When the flue gas cooling device is in a normal working state, the flue gas dust removal device can basically tolerate the temperature fluctuation of the flue gas to be purified, so that frequent air distribution operation is not needed.

Description

Technical Field

[0001] The present disclosure relates to the technical field of industrial silicon smelting fume purification, and in particular to a control method of an industrial silicon smelting fume purification system and an industrial silicon smelting fume purification system.

[0002] The present disclosure also relates to a control method that can be applied to the above-mentioned industrial silicon smelting flue gas purification system and an integrated dust removal and denitrification device in the industrial silicon smelting flue gas purification system. Background Art

[0003] Industrial silicon smelting flue gas refers to the high-temperature flue gas emitted by industrial silicon furnaces (usually submerged arc furnaces), which is referred to as industrial silicon furnace flue gas here. Since the flue gas from industrial silicon furnaces has high temperature, high dust content (mainly microsilicon powder) and contains harmful substances such as sulfur dioxide and nitrogen oxides, the flue gas from industrial silicon furnaces needs to be discharged after waste heat recovery, dust removal (for example, dust removal by flue gas filter dust collector), desulfurization (for example, desulfurization by dry desulfurization device) and denitrification (for example, denitrification by SCR denitrification reactor).

[0004] At present, the industrial silicon production field still generally uses traditional bag dust collectors as flue gas filtration dust collectors to purify the flue gas of industrial silicon furnaces after cooling. Since the bag filter element in the bag dust collector has weak high temperature resistance, low strength and poor thermal shock resistance, and the temperature fluctuation of the flue gas discharged during the operation of the industrial silicon furnace is relatively large, it is easy to cause the bag filter element to rupture.

[0005] Therefore, the existing industrial silicon smelting flue gas purification system must keep monitoring the flue gas temperature of the industrial silicon furnace. Once the flue gas of the industrial silicon furnace rises to the set threshold, it is necessary to inject external cold air into the flue gas of the industrial silicon furnace to cool it down (referred to as air distribution). However, frequent air distribution operations will further affect the operation of the industrial silicon furnace, thereby reducing the production efficiency of industrial silicon.

[0006] On the other hand, the existing industrial silicon smelting flue gas treatment system also adopts a dust removal and denitrification integrated device formed by assembling the SCR denitrification reactor on the flue gas filter dust collector. The dust removal and denitrification integrated device combines the two devices into one, which greatly saves the construction land of the industrial silicon smelting flue gas treatment system. However, the structural design of the dust removal and denitrification integrated device currently adopted is still not reasonable enough, mainly reflected in the fact that the specific structure of the dust removal and denitrification integrated device is relatively complex, resulting in high construction costs. Utility Model Content

[0007] The purposes of this disclosure are:

[0008] First, a control method for an industrial silicon smelting fume purification system is provided to solve the technical problem of improving the frequent air distribution operation affecting the operation of the industrial silicon furnace.

[0009] Secondly, an industrial silicon smelting fume purification system is provided to solve the technical problem of providing conditions for reducing the frequency of air distribution operations by improving the industrial silicon smelting fume purification system.

[0010] Thirdly, an integrated dust removal and denitrification equipment is provided to solve the technical problem of the complex structure of the existing integrated dust removal and denitrification equipment.

[0011] In a first aspect, a control method for an industrial silicon smelting fume purification system is provided, wherein the industrial silicon smelting fume purification system comprises:

[0012] A flue gas cooling device, used for receiving the flue gas discharged from the industrial silicon furnace and outputting the flue gas to be purified which is cooled to a set temperature range;

[0013] A flue gas dust removal device, used for performing dust removal treatment on the flue gas to be purified so as to reduce the dust content in the flue gas to be purified to within a set dust content range;

[0014] A flue gas desulfurization device, used for performing desulfurization treatment on the flue gas to be purified so as to reduce the sulfur dioxide content in the flue gas to be purified to within a set sulfur dioxide content range;

[0015] A flue gas denitration device, used for performing a denitration treatment on the flue gas to be purified so as to reduce the nitrogen oxide content in the flue gas to be purified to within a set nitrogen oxide content range;

[0016] A flue gas driving device, used for driving the flue gas to be purified so that the flue gas to be purified passes through the industrial silicon smelting flue gas purification system;

[0017] The flue gas dust removal device adopts a flue gas dust removal device that can withstand the temperature fluctuation of the flue gas to be dusted when the flue gas cooling device is in normal working state, and the flue gas driving device adopts a variable frequency fan;

[0018] In addition, it specifically includes:

[0019] Detecting the working state of the flue gas cooling device, and judging whether the flue gas cooling device is in a normal working state or an abnormal working state according to the detection result;

[0020] When it is determined that the flue gas cooling device is in a normal working state, the variable frequency fan is set to the first working mode, and the working frequency of the variable frequency fan is controlled by the industrial silicon furnace stable control mode;

[0021] When it is determined that the flue gas cooling device is in an abnormal working state, the variable frequency fan is set to the second working mode, and the working frequency of the variable frequency fan is controlled by the industrial silicon furnace flue gas temperature control method.

[0022] In the case of adopting a flue gas dust removal device that can tolerate temperature fluctuations of the flue gas to be dusted when the flue gas cooling device is in normal working condition, when it is judged that the flue gas cooling device is in normal working condition, the variable frequency fan is set to the first working mode. At this time, the working frequency of the variable frequency fan is controlled by the stable control mode of the industrial silicon furnace. The stable control mode of the industrial silicon furnace takes maintaining the stable operation of the industrial silicon furnace as a priority control target, and does not control the air distribution operation according to the temperature fluctuations of the flue gas to be dusted, thereby improving the frequent air distribution operation that affects the operation of the industrial silicon furnace.

[0023] When it is determined that the flue gas cooling device is in an abnormal working state, the variable frequency fan is set to the second working mode. At this time, the working frequency of the variable frequency fan is controlled by the industrial silicon furnace flue gas temperature control method. The industrial silicon furnace flue gas temperature control method takes controlling the industrial silicon furnace flue gas temperature as the priority control target, and waits for the dust removal flue gas temperature fluctuation to control the air distribution operation, thereby ensuring the effective operation of the industrial silicon smelting flue gas purification system.

[0024] In the second aspect, an industrial silicon smelting flue gas purification system comprises:

[0025] A flue gas cooling device, used to receive the flue gas discharged from the industrial silicon furnace and output the flue gas to be purified which is cooled to a temperature less than or equal to C1°C when the flue gas and the industrial silicon furnace are operating normally;

[0026] A flue gas dust removal device, used for performing dust removal treatment on the flue gas to be purified so as to reduce the dust content in the flue gas to be purified to within a set dust content range;

[0027] A flue gas desulfurization device, used for performing desulfurization treatment on the flue gas to be purified so as to reduce the sulfur dioxide content in the flue gas to be purified to within a set sulfur dioxide content range;

[0028] A flue gas denitration device, used for performing a denitration treatment on the flue gas to be purified so as to reduce the nitrogen oxide content in the flue gas to be purified to within a set nitrogen oxide content range;

[0029] A flue gas driving device, used for driving the flue gas to be purified so that the flue gas to be purified passes through the industrial silicon smelting flue gas purification system;

[0030] The flue gas dust removal device adopts a flue gas dust removal device that can withstand C2°C when the flue gas cooling device is in normal working condition, wherein the value of C2 minus C1 is ≥100°C or ≥120°C or ≥150°C or ≥200°C.

[0031] Through data analysis of the temperature fluctuation of the industrial silicon furnace flue gas discharged from the industrial silicon furnace, it is found that when the flue gas cooling device is in normal working condition, the temperature rise of the flue gas to be purified caused by the temperature fluctuation of the industrial silicon furnace flue gas discharged from the industrial silicon furnace is mostly below 100°C. Therefore, the flue gas dust removal device is designed to be able to withstand C2°C when the flue gas cooling device is in normal working condition, wherein the value of C2 minus C1 is ≥100°C or ≥120°C or ≥150°C or ≥200°C, thereby, the flue gas dust removal device can basically withstand the temperature fluctuation of the flue gas to be purified when the flue gas cooling device is in normal working condition, so there is no need for frequent air distribution operation.

[0032] The third aspect is a dust removal and denitrification integrated equipment, comprising:

[0033] A) A first box, wherein the first box has the following compartments formed by the partition system in the first box:

[0034] A1) a left dust collector main cabin body, the left dust collector main cabin body having more than one left dust collector compartment arranged in sequence along the front-to-back direction, each left dust collector compartment having a left dust collector lower raw air cabin and a left dust collector upper clean air cabin, a filter element mounting plate being arranged between the left dust collector lower raw air cabin and the left dust collector upper clean air cabin, a filter element being mounted on the filter element mounting plate and extending downward into the left dust collector lower raw air cabin;

[0035] A2) a right dust collector main cabin body, the right dust collector main cabin body having more than one right dust collector compartments arranged in sequence along the front-to-back direction, each right dust collector compartment having a right dust collector lower raw air cabin and a right dust collector upper clean air cabin, a filter element mounting plate being provided between the right dust collector lower raw air cabin and the right dust collector upper clean air cabin, a filter element being mounted on the filter element mounting plate and extending downward into the left dust collector lower raw air cabin;

[0036] A3) an intermediate flue main cabin body, the intermediate flue main cabin body is located between the left dust collector main cabin body and the right dust collector main cabin body and has a lower air intake flue cabin and an upper clean air delivery cabin, the lower air intake flue cabin extends in the front-to-back direction and is respectively communicated with the lower original air cabin of each left dust collector and the lower original air cabin of each right dust collector, the upper clean air delivery cabin is located above the lower air intake flue cabin, extends in the front-to-back direction and is respectively communicated with the upper clean air cabin of each left dust collector and the upper clean air cabin of each right dust collector;

[0037] B) a second box, which is arranged at the rear of the first box, and has the following compartments formed by the partition system in the second box:

[0038] B1) a front gas collecting cabin, wherein the lower portion of the front gas collecting cabin is arranged at the rear of the upper clean air delivery cabin and communicates with the upper clean air delivery cabin, and the upper portion of the front gas collecting cabin is provided with an upper exhaust port of the front gas collecting cabin;

[0039] B2) a rear SCR denitration reaction chamber, wherein the rear SCR denitration reaction chamber is arranged at the rear of the front air collecting chamber, the upper portion of the rear SCR denitration reaction chamber is communicated with the upper exhaust port of the front air collecting chamber, the lower portion of the rear SCR denitration reaction chamber is provided with a rear SCR denitration reaction chamber lower exhaust port, and an SCR denitration catalyst bed is arranged in the rear SCR denitration reaction chamber.

[0040] The above-mentioned integrated dust removal and denitrification equipment has the appearance characteristics of a combination of a large box (first box) and a small box (second box), and the small box is located at the rear of the large box. Among them, the upper clean air conveying cabin of the large box combined with the connection relationship between the small box and the large box is the key innovation of the integrated dust removal and denitrification equipment. Since the small box is located at the rear of the large box, the large box does not need to bear the weight of the small box. The large box guides the airflow into the small box through the upper clean air conveying cabin, which simply realizes the connection between the large box and the small box. The advantages of the above-mentioned integrated dust removal and denitrification equipment are simple structure and can save construction costs.

[0041] The present disclosure is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present disclosure will be partially given in the following description, partially become apparent from the following description, or be understood through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings constituting a part of this specification are used to assist in understanding the present disclosure. The contents provided in the drawings and their related descriptions in this specification may be used to explain the present disclosure, but shall not constitute an improper limitation on the present disclosure.

[0043] Figure 1 This is a schematic diagram of the structure of the industrial silicon smelting flue gas treatment system of the first embodiment of the present disclosure.

[0044] Figure 2 This is a schematic diagram of the structure of the industrial silicon smelting flue gas treatment system of the second embodiment of the present disclosure.

[0045] Figure 3 This is a schematic diagram of the structure of the industrial silicon smelting flue gas treatment system of the third embodiment of the present disclosure.

[0046] Figure 4 This is a schematic diagram of the structure of the industrial silicon smelting flue gas treatment system of the fourth embodiment of the present disclosure.

[0047] Figure 5 This is a schematic diagram of the structure of the industrial silicon smelting flue gas treatment system of the fifth embodiment of the present disclosure.

[0048] Figure 6 It is a front view of the integrated dust removal and denitrification equipment according to an embodiment of the present disclosure.

[0049] Figure 7 for Figure 6 The top view of the integrated dust removal and denitrification equipment is shown.

[0050] Figure 8 for Figure 6 The left view of the integrated dust removal and denitrification equipment is shown. DETAILED DESCRIPTION

[0051] The present disclosure is described clearly and completely below in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the present disclosure based on these descriptions. Before describing the present disclosure in conjunction with the accompanying drawings, it should be particularly noted that:

[0052] The technical solutions and technical features provided in each section, including the following description, can be combined with each other without conflict. In addition, where possible, these technical solutions, technical features and related combinations can be assigned specific technical themes and protected by relevant patents.

[0053] The embodiments of the present disclosure involved in the following description are generally only a part of the embodiments rather than all the embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of patent protection.

[0054] Regarding the terms and units in this specification: The terms "include", "comprises", "have" and any variations thereof in this specification, the corresponding claims and related parts are intended to cover non-exclusive inclusions. The terms "front", "rear", "left" and "right" in this specification, the corresponding claims and related parts represent relative positional relationships based on the drawings. In addition, other relevant terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0055] Figure 1 FIG. 1 is a schematic diagram of the structure of the industrial silicon smelting flue gas treatment system according to the first embodiment of the present disclosure. Figure 1 As shown, the industrial silicon smelting flue gas treatment system includes:

[0056] The flue gas cooling device 11 is used to receive the flue gas discharged from the industrial silicon furnace and output the flue gas to be purified which is cooled to a temperature less than or equal to C1°C when the flue gas cooling device 11 and the industrial silicon furnace are operating normally;

[0057] The flue gas dust removal device 12 is used to perform dust removal on the flue gas to be purified so as to reduce the dust content in the flue gas to be purified to a set dust content range;

[0058] A flue gas desulfurization device 13 is used to perform desulfurization treatment on the flue gas to be purified so as to reduce the sulfur dioxide content in the flue gas to be purified to a set sulfur dioxide content range;

[0059] A flue gas denitration device 14, used for performing a denitration treatment on the flue gas to be purified so as to reduce the nitrogen oxide content in the flue gas to be purified to within a set nitrogen oxide content range;

[0060] The flue gas driving device 2 is used to drive the flue gas to be purified so that the flue gas to be purified passes through the industrial silicon smelting flue gas purification system.

[0061] Specifically, the flue gas cooling device 11 adopts a waste heat boiler 111; the flue gas dust removal device 12 adopts a high-temperature resistant flue gas filter dust collector 121, and the high-temperature resistant flue gas filter dust collector 121 filters and removes dust through a filter element, and the filter element can withstand the flue gas to be filtered at C2°C; the flue gas desulfurization device 13 adopts a wet desulfurization device 131; the flue gas denitrification device adopts an ozone oxidation device 141.

[0062] The waste heat boiler 111 , the high temperature resistant flue gas filter dust collector 121 , the ozone oxidation device 141 and the wet desulfurization device 131 are arranged in order from front to back. The tail gas of the wet desulfurization device 131 is discharged through the flue gas flushing 3 .

[0063] The flue gas driving device 2 adopts a variable frequency fan 21 , and the variable frequency fan 21 is arranged between the ozone oxidation device 141 and the wet desulfurization device 131 .

[0064] When working, the temperature of the flue gas to be purified output by the waste heat boiler 111 when the waste heat boiler 111 and the industrial silicon furnace are operating normally is 140°C-210°C. That is, C1 is 210°C.

[0065] The filter element adopts a metal filter bag, which can withstand the flue gas to be filtered at 500° C., that is, C2 is 500° C. In addition, the metal filter bag has excellent thermal shock resistance.

[0066] In addition, an industrial silicon furnace flue gas emergency conveying bypass 41 connected in parallel with the waste heat boiler 111 is arranged next to the waste heat boiler 111, and a cooling gas input pipeline 42 is connected to the industrial silicon furnace flue gas emergency conveying bypass 41. The inlet of the industrial silicon furnace flue gas emergency conveying bypass 41, the inlet of the waste heat boiler 111 and the inlet of the cooling gas input pipeline 42 are all provided with valves, and the inlet of the cooling gas input pipeline 42 is connected to a cooling gas intake device 43.

[0067] The industrial silicon smelting flue gas treatment system of the first embodiment also adopts the following control strategy for the variable frequency fan 21. Specifically, the control strategy can be described as including the following steps:

[0068] S1: Detecting the working state of the flue gas cooling device 11 (waste heat boiler 111), and judging whether the flue gas cooling device (waste heat boiler 111) is in a normal working state or an abnormal working state according to the detection result;

[0069] S2: When it is determined that the flue gas cooling device 11 (waste heat boiler 111) is in a normal working state, the variable frequency fan 21 is set to the first working mode, and the working frequency of the variable frequency fan 21 is controlled by the industrial silicon furnace stable control mode;

[0070] S3: When it is determined that the flue gas cooling device 11 (waste heat boiler 111) is in an abnormal working state, the variable frequency fan 21 is set to the second working mode, and the working frequency of the variable frequency fan 21 is controlled by the industrial silicon furnace flue gas temperature control method.

[0071] Through data analysis of the temperature fluctuations of the industrial silicon furnace flue gas discharged from the industrial silicon furnace, it was found that when the waste heat boiler 111 is in normal working condition, the temperature fluctuations of the industrial silicon furnace flue gas discharged from the industrial silicon furnace caused the temperature increase of the flue gas to be purified to be lower than 100°C in most cases, and between 100°C-200°C in a few cases.

[0072] The filter element of the high-temperature resistant flue gas filter dust collector 121 can withstand 500°C flue gas to be filtered, and the waste heat boiler 111 is designed to output the flue gas to be purified at a temperature of 140°C-210°C when the waste heat boiler 111 and the industrial silicon furnace are operating normally. That is to say, if the temperature fluctuation of the industrial silicon furnace flue gas discharged from the industrial silicon furnace causes the temperature rise of the flue gas to be purified to be 200°C (the temperature of the flue gas to be purified reaches 410°C), at this time, the filter element of the high-temperature resistant flue gas filter dust collector 121 can still withstand it, and there is still a sufficiently large redundancy.

[0073] On this basis, the above control strategy is adopted for the variable frequency fan 21. When it is judged that the flue gas cooling device 11 (waste heat boiler 111) is in a normal working state, the variable frequency fan 21 is set to the first working mode. At this time, the working frequency of the variable frequency fan 21 is controlled by the stable control mode of the industrial silicon furnace. The stable control mode of the industrial silicon furnace takes maintaining the stable operation of the industrial silicon furnace as the priority control target, and does not control the air distribution operation based on the fluctuation of the dust removal flue gas temperature, thereby improving the frequent air distribution operation affecting the operation of the industrial silicon furnace.

[0074] When it is determined that the flue gas cooling device 11 (waste heat boiler 111) is in an abnormal working state, the variable frequency fan 21 is set to the second working mode. At this time, the working frequency of the variable frequency fan 21 is controlled by the industrial silicon furnace flue gas temperature control method. The industrial silicon furnace flue gas temperature control method takes controlling the industrial silicon furnace flue gas temperature as the priority control target, and waits for the dust removal flue gas temperature fluctuation to control the air distribution operation, so as to ensure the effective operation of the industrial silicon smelting flue gas purification system.

[0075] Among them, detecting the working state of the flue gas cooling device 11 (waste heat boiler 111), and judging whether the flue gas cooling device 11 (waste heat boiler 111) is in a normal working state or an abnormal working state according to the detection result may specifically include:

[0076] Detect the opening and closing states of the valve at the inlet of the industrial silicon furnace flue gas emergency transport bypass 41, the valve 42 at the inlet of the cooling gas input pipeline, and the valve at the inlet of the flue gas cooling device 11 (waste heat boiler 111), and judge whether the flue gas cooling device 11 (waste heat boiler 111) is in a normal working state or an abnormal working state based on the opening and closing states of these valves.

[0077] When the valve at the inlet of the industrial silicon furnace flue gas emergency transport bypass 41 and the valve at the inlet of the cooling gas input pipeline 42 are both in the closed state and the valve at the inlet of the flue gas cooling device 11 (waste heat boiler 111) is in the open state, it means that the flue gas cooling device 11 (waste heat boiler 111) is in a normal working state.

[0078] When the valve at the inlet of the industrial silicon furnace flue gas emergency transport bypass 41 and the valve at the inlet of the cooling gas input pipeline 42 are both in the open state and the valve at the inlet of the flue gas cooling device 11 (waste heat boiler 111) is in the closed state, it means that the flue gas cooling device 11 (waste heat boiler 111) is in an abnormal working state.

[0079] During actual operation, whether it is necessary to switch the opening and closing states of the valve at the inlet of the industrial silicon furnace flue gas emergency transport bypass 41, the valve 42 at the inlet of the cooling gas input pipeline, and the valve at the inlet of the flue gas cooling device 11 (waste heat boiler 111) can be determined according to the change in the flue gas temperature difference between the inlet and outlet of the flue gas cooling device 11 (waste heat boiler 111).

[0080] When the valve at the inlet of the industrial silicon furnace flue gas emergency transport bypass 41 and the valve at the inlet of the cooling gas input pipeline 42 are both in the closed state and the valve at the inlet of the flue gas cooling device 11 (waste heat boiler 111) is in the open state, the flue gas of the industrial silicon furnace completely passes through the flue gas cooling device 11 (waste heat boiler 111). At this time, the flue gas temperature difference at the inlet and outlet of the flue gas cooling device 11 (waste heat boiler 111) needs to be continuously monitored.

[0081] When the temperature difference between the flue gas inlet and outlet of the flue gas cooling device 11 (waste heat boiler 111) exceeds the allowable condition, the valve at the inlet of the industrial silicon furnace flue gas emergency conveying bypass 41 and the valve at the inlet of the cooling gas input pipeline 42 are switched to the open state and the valve at the inlet of the flue gas cooling device 11 (waste heat boiler 111) is closed. In this way, the industrial silicon furnace flue gas completely passes through the industrial silicon furnace flue gas emergency conveying bypass 41 and is mixed with the cooling gas (such as outside air) from the cooling gas input pipeline 42, thereby achieving cooling of the industrial silicon furnace flue gas (i.e., air distribution operation).

[0082] It can be seen that based on the deployment of such a structure, namely: an industrial silicon furnace flue gas emergency transportation bypass 41 connected in parallel with the waste heat boiler 111 is arranged next to the waste heat boiler 111, and a cooling gas input pipeline 42 is connected to the industrial silicon furnace flue gas emergency transportation bypass 41, and valves are arranged at the inlet of the industrial silicon furnace flue gas emergency transportation bypass 41, the inlet of the waste heat boiler 111 and the inlet of the cooling gas input pipeline 42, and a cooling gas intake device 43 is connected to the inlet of the cooling gas input pipeline 42. This structure is used as an air distribution device to implement air distribution operations, and also serves as a switching bypass when the flue gas cooling device 11 (waste heat boiler 111) is abnormal (such as failure, maintenance).

[0083] Generally speaking, the industrial silicon furnace stable control method controls the variable frequency fan in response to changes in the operating parameters of the industrial silicon furnace, thereby maintaining the stable operation of the industrial silicon furnace.

[0084] Specifically, the operating parameters of the industrial silicon furnace include furnace pressure (also known as "furnace pressure"). The industrial silicon furnace stability control method adjusts the operating frequency of the variable frequency fan to control the recovery of the furnace pressure when the furnace pressure fluctuation or the change of the associated parameters of the furnace pressure fluctuation reaches the set situation.

[0085] Furnace pressure is the most important factor affecting the control of variable frequency fans. When furnace pressure increases, it is often necessary to increase the speed (frequency) of the variable frequency fan to improve the smoke extraction capacity, and vice versa.

[0086] At present, industrial silicon furnaces generally use semi-open submerged arc furnaces. During the operation of the semi-open submerged arc furnace, the furnace pressure often rises suddenly when the furnace is rammed or material collapse occurs. In the stable control mode of the industrial silicon furnace, when furnace pressure fluctuations or changes in associated parameters of furnace pressure fluctuations are detected (the associated parameter changes here can be, for example, the issuance of a ramming instruction), the frequency of the variable frequency fan 21 is increased.

[0087] Modern industrial silicon furnaces are usually equipped with pressure sensors, which can monitor the pressure changes in the furnace in real time and send data to the control system. In the stable control mode of the industrial silicon furnace, the speed (frequency) of the variable frequency fan can be adjusted according to these data.

[0088] In addition to the furnace pressure, the industrial silicon furnace stability control method can usually also consider control factors such as furnace temperature (note that the temperature here refers to the furnace temperature, not the flue gas temperature) and energy consumption management.

[0089] Generally speaking, the industrial silicon furnace flue gas temperature control method controls the variable frequency fan by responding to changes in the operating parameters of the air distribution operation.

[0090] Specifically, the operating parameters of the air distribution operation include cooling air flow rate, and the industrial silicon furnace flue gas temperature control method adjusts the operating frequency of the variable frequency fan 21 when the fluctuation of cooling air flow rate or the change of the associated parameters of the fluctuation of cooling air flow rate reaches the set situation.

[0091] For example, the operating frequency of the variable frequency fan 21 may be increased according to the cooling air flow rate. The larger the cooling air flow rate, the higher the operating frequency of the variable frequency fan 21 may be.

[0092] The speed (frequency) of the variable frequency fan is usually controlled by variable frequency drives (VFDs). The variable frequency drives (VFDs) are controlled by a control system that can run the computer program or instructions of the above-mentioned industrial silicon furnace stability control method and industrial silicon furnace flue gas temperature control method.

[0093] In the industrial silicon smelting flue gas treatment system of Example 1, the principle of desulfurization and denitrification is as follows: the ozone oxidation device 141 can oxidize nitrogen monoxide in the flue gas into water-soluble nitrogen oxides (such as nitrogen pentoxide) through ozone, and these water-soluble nitrogen oxides will be absorbed by water in the wet desulfurization device 131. The wet desulfurization device 131 is used for wet desulfurization, and wet desulfurization specifically uses a desulfurization solution as a desulfurizing agent for desulfurization.

[0094] Figure 2This is a schematic diagram of the structure of the industrial silicon smelting flue gas treatment system according to the second embodiment of the present disclosure. Figure 2 As shown, the industrial silicon smelting flue gas treatment system includes:

[0095] The flue gas cooling device 11 is used to receive the flue gas discharged from the industrial silicon furnace and output the flue gas to be purified which is cooled to a temperature less than or equal to C1°C when the flue gas cooling device 11 and the industrial silicon furnace are operating normally;

[0096] The flue gas dust removal device 12 is used to perform dust removal on the flue gas to be purified so as to reduce the dust content in the flue gas to be purified to a set dust content range;

[0097] A flue gas desulfurization device 13 is used to perform desulfurization treatment on the flue gas to be purified so as to reduce the sulfur dioxide content in the flue gas to be purified to a set sulfur dioxide content range;

[0098] A flue gas denitration device 14, used for performing a denitration treatment on the flue gas to be purified so as to reduce the nitrogen oxide content in the flue gas to be purified to within a set nitrogen oxide content range;

[0099] The flue gas driving device 2 is used to drive the flue gas to be purified so that the flue gas to be purified passes through the industrial silicon smelting flue gas purification system.

[0100] Specifically, the flue gas cooling device 11 adopts a waste heat boiler 111; the flue gas dust removal device 12 adopts a high-temperature resistant flue gas filter dust collector 121, and the high-temperature resistant flue gas filter dust collector 121 filters and removes dust through a filter element, and the filter element can withstand the flue gas to be filtered at C2°C; the flue gas desulfurization device 13 adopts a dry desulfurization device 132; the flue gas denitrification device adopts a low-temperature SCR denitrification device 142.

[0101] The waste heat boiler 111, the dry desulfurization device 132, the high temperature resistant flue gas filter dust collector 121, and the low temperature SCR denitration device 142 are arranged in sequence from front to back. The tail gas of the low temperature SCR denitration device 142 is discharged through the flue gas 3.

[0102] The flue gas driving device 2 adopts a variable frequency fan 21 , and the variable frequency fan 21 is arranged between the high temperature resistant flue gas filter dust collector 121 and the low temperature SCR denitrification device 142 .

[0103] When working, the temperature of the flue gas to be purified output by the waste heat boiler 111 when the waste heat boiler 111 and the industrial silicon furnace are operating normally is 180°C-250°C. That is, C1 is 250°C.

[0104] The filter element adopts a ceramic tubular filter element, which can withstand the flue gas to be filtered at 600° C., that is, C2 is 600° C. In addition, the ceramic tubular filter element has high strength and excellent thermal vibration resistance.

[0105] In addition, an industrial silicon furnace flue gas emergency conveying bypass 41 connected in parallel with the waste heat boiler 111 is arranged next to the waste heat boiler 111, and a cooling gas input pipeline 42 is connected to the industrial silicon furnace flue gas emergency conveying bypass 41. The inlet of the industrial silicon furnace flue gas emergency conveying bypass 41, the inlet of the waste heat boiler 111 and the inlet of the cooling gas input pipeline 42 are all provided with valves, and the inlet of the cooling gas input pipeline 42 is connected to a cooling gas intake device 43.

[0106] The industrial silicon smelting flue gas treatment system of the second embodiment also adopts the same control strategy as the first embodiment for the variable frequency fan 21, which will not be described in detail here.

[0107] In the industrial silicon smelting flue gas treatment system of Example 2, the dry desulfurization device 132 can specifically adopt SDS desulfurization technology (sodium bicarbonate dry desulfurization). The low-temperature SCR denitrification device 142 uses a low-temperature SCR denitrification catalyst. The low-temperature SCR denitrification device 142 using a low-temperature SCR denitrification catalyst is a prior art and will not be described in detail here.

[0108] Figure 3 This is a schematic diagram of the structure of the industrial silicon smelting flue gas treatment system according to the third embodiment of the present disclosure. Figure 3 As shown, the industrial silicon smelting flue gas treatment system includes:

[0109] The flue gas cooling device 11 is used to receive the flue gas discharged from the industrial silicon furnace and output the flue gas to be purified which is cooled to a temperature less than or equal to C1°C when the flue gas cooling device 11 and the industrial silicon furnace are operating normally;

[0110] The flue gas dust removal device 12 is used to perform dust removal on the flue gas to be purified so as to reduce the dust content in the flue gas to be purified to a set dust content range;

[0111] A flue gas desulfurization device 13 is used to perform desulfurization treatment on the flue gas to be purified so as to reduce the sulfur dioxide content in the flue gas to be purified to a set sulfur dioxide content range;

[0112] A flue gas denitration device 14, used for performing a denitration treatment on the flue gas to be purified so as to reduce the nitrogen oxide content in the flue gas to be purified to within a set nitrogen oxide content range;

[0113] The flue gas driving device 2 is used to drive the flue gas to be purified so that the flue gas to be purified passes through the industrial silicon smelting flue gas purification system.

[0114] Specifically, the flue gas cooling device 11 adopts a waste heat boiler 111; the flue gas dust removal device 12 adopts a high-temperature resistant flue gas filter dust collector 121, and the high-temperature resistant flue gas filter dust collector 121 filters and removes dust through a filter element, and the filter element can withstand the flue gas to be filtered at C2°C; the flue gas desulfurization device 13 adopts a wet desulfurization device 131; the flue gas denitrification device adopts a low-temperature SCR denitrification device 142.

[0115] The waste heat boiler 111, the high temperature resistant flue gas filter dust collector 121, the low temperature SCR denitrification device 142 and the wet desulfurization device 131 are arranged in sequence from front to back. The tail gas of the wet desulfurization device 131 is discharged through the flue gas 3.

[0116] The flue gas driving device 2 adopts a variable frequency fan 21 , and the variable frequency fan 21 is arranged between the low-temperature SCR denitrification device 142 and the wet desulfurization device 131 .

[0117] When working, the temperature of the flue gas to be purified output by the waste heat boiler 111 when the waste heat boiler 111 and the industrial silicon furnace are operating normally is 180°C-250°C. That is, C1 is 250°C.

[0118] The filter element adopts a metal filter bag, which can withstand the flue gas to be filtered at 500° C., that is, C2 is 500° C. In addition, the metal filter bag has excellent thermal shock resistance.

[0119] In addition, an industrial silicon furnace flue gas emergency conveying bypass 41 connected in parallel with the waste heat boiler 111 is arranged next to the waste heat boiler 111, and a cooling gas input pipeline 42 is connected to the industrial silicon furnace flue gas emergency conveying bypass 41. The inlet of the industrial silicon furnace flue gas emergency conveying bypass 41, the inlet of the waste heat boiler 111 and the inlet of the cooling gas input pipeline 42 are all provided with valves, and the inlet of the cooling gas input pipeline 42 is connected to a cooling gas intake device 43.

[0120] The industrial silicon smelting flue gas treatment system of the third embodiment also adopts the same control strategy as the first embodiment for the variable frequency fan 21, which will not be described in detail here.

[0121] In the industrial silicon smelting flue gas treatment system of Example 3, a low-temperature SCR denitration catalyst is used in the low-temperature SCR denitration device 142. The low-temperature SCR denitration device 142 using the low-temperature SCR denitration catalyst is a prior art and will not be described in detail here. The wet desulfurization device 131 is used for wet desulfurization, and wet desulfurization is specifically performed by using a desulfurization solution as a desulfurization agent for desulfurization.

[0122] As an improvement, in the industrial silicon smelting flue gas treatment system of the third embodiment, a newly designed integrated dust removal and denitrification equipment can also be used. The integrated dust removal and denitrification equipment will be described later.

[0123] Figure 4 This is a schematic diagram of the structure of the industrial silicon smelting flue gas treatment system according to the fourth embodiment of the present disclosure. Figure 4 As shown, the industrial silicon smelting flue gas treatment system includes:

[0124] The flue gas cooling device 11 is used to receive the flue gas discharged from the industrial silicon furnace and output the flue gas to be purified which is cooled to a temperature less than or equal to C1°C when the flue gas and the industrial silicon furnace are operating normally;

[0125] The flue gas dust removal device 12 is used to perform dust removal on the flue gas to be purified so as to reduce the dust content in the flue gas to be purified to a set dust content range;

[0126] A flue gas desulfurization device 13, used for performing desulfurization treatment on the flue gas to be purified so as to reduce the sulfur dioxide content in the flue gas to be purified to within a set sulfur dioxide content range;

[0127] A flue gas denitration device 14 is used to perform denitration treatment on the flue gas to be purified so as to reduce the nitrogen oxide content in the flue gas to be purified to a set nitrogen oxide content range;

[0128] The flue gas driving device 2 is used to drive the flue gas to be purified so that the flue gas to be purified passes through the industrial silicon smelting flue gas purification system.

[0129] Specifically, the flue gas cooling device 11 adopts a waste heat boiler 111; the flue gas dust removal device 12 adopts a high-temperature resistant flue gas filter dust collector 121, and the high-temperature resistant flue gas filter dust collector 121 filters and removes dust through a filter element, and the filter element can withstand the flue gas to be filtered at C2°C; the flue gas desulfurization device 13 adopts a dry desulfurization device 132; the flue gas denitrification device adopts a low-temperature SCR denitrification device 142.

[0130] The waste heat boiler 111, the high temperature resistant flue gas filter dust collector 121, the dry desulfurization device 132, and the low temperature SCR denitration device 142 are arranged in sequence from front to back. The tail gas of the low temperature SCR denitration device 142 is discharged through the flue gas 3.

[0131] Wherein, a second dust removal device 15 is further provided between the dry desulfurization device 132 and the low-temperature SCR denitrification device, and the second dust removal device 15 adopts a bag dust collector 151 .

[0132] The flue gas driving device 2 adopts a variable frequency fan 21 , and the variable frequency fan 21 is arranged between the bag filter 151 and the low-temperature SCR denitrification device 142 .

[0133] When working, the temperature of the flue gas to be purified output by the waste heat boiler 111 when the waste heat boiler 111 and the industrial silicon furnace are operating normally is 180°C-250°C. That is, C1 is 250°C.

[0134] The filter element adopts a metal tubular filter element, which can withstand the flue gas to be filtered at 600° C., that is, C2 is 600° C. The metal tubular filter element has excellent thermal shock resistance.

[0135] In addition, an industrial silicon furnace flue gas emergency conveying bypass 41 connected in parallel with the waste heat boiler 111 is arranged next to the waste heat boiler 111, and a cooling gas input pipeline 42 is connected to the industrial silicon furnace flue gas emergency conveying bypass 41. The inlet of the industrial silicon furnace flue gas emergency conveying bypass 41, the inlet of the waste heat boiler 111 and the inlet of the cooling gas input pipeline 42 are all provided with valves, and the inlet of the cooling gas input pipeline 42 is connected to a cooling gas intake device 43.

[0136] The industrial silicon smelting flue gas treatment system of the fourth embodiment also adopts the same control strategy as the first embodiment for the variable frequency fan 21, which will not be described in detail here.

[0137] In the industrial silicon smelting flue gas treatment system of Example 4, the dry desulfurization device 132 can specifically adopt SDS desulfurization technology (sodium bicarbonate dry desulfurization). A low-temperature SCR denitration catalyst is used in the low-temperature SCR denitration device 142. The low-temperature SCR denitration device 142 using a low-temperature SCR denitration catalyst is a prior art and will not be described in detail here.

[0138] In the industrial silicon smelting flue gas treatment system of Example 4, since a second dust removal device 15 is provided between the dry desulfurization device 132 and the low-temperature SCR denitrification device, the dust (desulfurizer) in the flue gas discharged from the dry desulfurization device 132 can be removed to avoid clogging of the low-temperature SCR denitrification catalyst in the low-temperature SCR denitrification device.

[0139] Figure 5 This is a structural schematic diagram of an industrial silicon smelting flue gas treatment system according to Embodiment 5 of the present disclosure. As shown in 5, the industrial silicon smelting flue gas treatment system comprises:

[0140] The flue gas cooling device 11 is used to receive the flue gas discharged from the industrial silicon furnace and output the flue gas to be purified which is cooled to a temperature less than or equal to C1°C when the flue gas cooling device 11 and the industrial silicon furnace are operating normally;

[0141] The flue gas dust removal device 12 is used to perform dust removal on the flue gas to be purified so as to reduce the dust content in the flue gas to be purified to a set dust content range;

[0142] A flue gas desulfurization device 13, used for performing desulfurization treatment on the flue gas to be purified so as to reduce the sulfur dioxide content in the flue gas to be purified to within a set sulfur dioxide content range;

[0143] A flue gas denitration device 14 is used to perform denitration treatment on the flue gas to be purified so as to reduce the nitrogen oxide content in the flue gas to be purified to a set nitrogen oxide content range;

[0144] The flue gas driving device 2 is used to drive the flue gas to be purified so that the flue gas to be purified passes through the industrial silicon smelting flue gas purification system.

[0145] Specifically, the flue gas cooling device 11 adopts a waste heat boiler 111; the flue gas dust removal device 12 adopts a high-temperature resistant flue gas filter dust collector 121, and the high-temperature resistant flue gas filter dust collector 121 filters and removes dust through a filter element, and the filter element can withstand the flue gas to be filtered at C2°C; the flue gas desulfurization device 13 adopts a dry desulfurization device 132; the flue gas denitrification device adopts a low-temperature SCR denitrification device 142.

[0146] Among them, the waste heat boiler 111, the high temperature resistant flue gas filter dust collector 121, the low temperature SCR denitrification device 142, and the dry desulfurization device 132 are arranged in sequence from front to back.

[0147] The smoke driving device 2 adopts a variable frequency fan 21 , and the tail gas of the variable frequency fan 21 is discharged through the smoke flush 3 .

[0148] Wherein, a second dust removal device 15 is further provided between the dry desulfurization device 132 and the variable frequency fan 21 , and the second dust removal device 15 adopts a bag dust collector 151 .

[0149] When working, the temperature of the flue gas to be purified output by the waste heat boiler 111 when the waste heat boiler 111 and the industrial silicon furnace are operating normally is 180°C-250°C. That is, C1 is 250°C.

[0150] The filter element adopts a metal filter bag, which can withstand the flue gas to be filtered at 500° C., that is, C2 is 500° C. The metal filter bag has excellent thermal shock resistance.

[0151] In addition, an industrial silicon furnace flue gas emergency conveying bypass 41 connected in parallel with the waste heat boiler 111 is arranged next to the waste heat boiler 111, and a cooling gas input pipeline 42 is connected to the industrial silicon furnace flue gas emergency conveying bypass 41. The inlet of the industrial silicon furnace flue gas emergency conveying bypass 41, the inlet of the waste heat boiler 111 and the inlet of the cooling gas input pipeline 42 are all provided with valves, and the inlet of the cooling gas input pipeline 42 is connected to a cooling gas intake device 43.

[0152] The industrial silicon smelting flue gas treatment system of the fifth embodiment also adopts the same control strategy as the first embodiment for the variable frequency fan 21, which will not be described in detail here.

[0153] In the industrial silicon smelting flue gas treatment system of Example 5, the dry desulfurization device 132 can specifically adopt SDS desulfurization technology (sodium bicarbonate dry desulfurization). The low-temperature SCR denitrification device 142 uses a low-temperature SCR denitrification catalyst. The low-temperature SCR denitrification device 142 using a low-temperature SCR denitrification catalyst is a prior art and will not be described in detail here.

[0154] As an improvement, in the industrial silicon smelting flue gas treatment system of Example 5, a newly designed integrated dust removal and denitrification equipment can also be used. The integrated dust removal and denitrification equipment will be described later.

[0155] To ensure the stability of the filter element, in the above embodiment, the thermal vibration resistance of the filter element (the thermal vibration resistance of the filter element is related to the mechanical properties of the filter element such as strength and toughness) can be tested as follows: even if the temperature of the filter element test environment rises from room temperature to 500°C within 5 minutes, it is maintained for a certain period of time (this time is determined according to the test needs) and then naturally cooled to room temperature, the above operation is repeated for more than 5 times, and then the filter element is inspected. If no damage occurs, it is considered that the thermal vibration resistance of the filter element meets the requirements.

[0156] Figure 6 It is a front view of the integrated dust removal and denitrification equipment according to an embodiment of the present disclosure. Figure 7 for Figure 6 The top view of the integrated dust removal and denitrification equipment is shown. Figure 8 for Figure 6 The left side view of the integrated dust removal and denitrification equipment is shown in FIG. Figure 6-Figure 8 As shown, a dust removal and denitrification integrated equipment comprises:

[0157] A) A first box 51, wherein the first box 51 has the following compartments separated by the first box internal partition system:

[0158] A1) a left dust collector main cabin body 511, the left dust collector main cabin body 511 has more than one left dust collector compartment arranged in sequence along the front-to-back direction, each left dust collector compartment has a left dust collector lower raw air cabin and a left dust collector upper clean air cabin, a filter element mounting plate is provided between the left dust collector lower raw air cabin and the left dust collector upper clean air cabin, and a filter element extending downward into the left dust collector lower raw air cabin is installed on the filter element mounting plate;

[0159] A2) a right dust collector main cabin body 512, the right dust collector main cabin body 512 having more than one right dust collector compartments arranged in sequence along the front-to-back direction, each right dust collector compartment having a right dust collector lower raw air cabin and a right dust collector upper clean air cabin, a filter element mounting plate being provided between the right dust collector lower raw air cabin and the right dust collector upper clean air cabin, a filter element being mounted on the filter element mounting plate and extending downward into the left dust collector lower raw air cabin;

[0160] A3) an intermediate flue main cabin 513, the intermediate flue main cabin 513 is located between the left dust collector main cabin 511 and the right dust collector main cabin 512 and has a lower air intake flue cabin 513a and an upper clean air delivery cabin 513b, the lower air intake flue cabin 513a extends in the front-to-back direction and is respectively connected to the lower original air cabin of each left dust collector and the lower original air cabin of each right dust collector, the upper clean air delivery cabin 513b is located above the lower air intake flue cabin 513a, extends in the front-to-back direction and is respectively connected to the upper clean air cabin of each left dust collector and the upper clean air cabin of each right dust collector;

[0161] B) A second box 52, which is arranged at the rear of the first box 51, and has the following compartments formed by the partition system in the second box:

[0162] B1) a front air collecting cabin 521, the lower portion of which is arranged at the rear of the upper clean air delivery cabin 513b and communicates with the upper clean air delivery cabin 513b, and the upper portion of the front air collecting cabin 521 is provided with an upper exhaust port of the front air collecting cabin;

[0163] B2) a rear SCR denitration reaction chamber 522, wherein the rear SCR denitration reaction chamber 522 is arranged at the rear of the front air collecting chamber 521, the upper portion of the rear SCR denitration reaction chamber 522 is connected to the upper exhaust port of the front air collecting chamber, the lower portion of the rear SCR denitration reaction chamber 522 is provided with a rear SCR denitration reaction chamber lower exhaust port, and an SCR denitration catalyst bed 523 is provided in the rear SCR denitration reaction chamber 522.

[0164] Specifically, the intermediate flue main cabin body 513 also has a middle exhaust flue cabin 513c located between the lower air intake flue cabin 513a and the upper clean air delivery cabin 513b, and the middle exhaust flue cabin 513c extends in the front-to-back direction; the lower exhaust port of the rear SCR denitrification reaction cabin is connected to the rear end of the middle exhaust flue cabin 513c; the total air intake port of the lower air intake flue cabin 513a and the total exhaust port of the middle exhaust flue cabin 513c are arranged on the front side of the first box body 51.

[0165] Since the total air inlet of the lower air inlet flue chamber 513a and the total exhaust outlet of the middle exhaust flue chamber 513c are arranged on the front side of the first box body 51, the integrated dust removal and denitrification equipment realizes "same-side air inlet and outlet", which is a novel design that is beneficial to saving the flue gas purification system (such as the overall floor space of the industrial silicon smelting flue gas purification system).

[0166] Specifically, the top plate of the lower air intake flue chamber 513a and the bottom plate of the middle exhaust flue chamber 513c are composed of the same inclined first inclined plate 513d, so that the cross-sectional area of ​​the lower air intake flue chamber 513a in the front-to-back direction gradually decreases along the air intake direction.

[0167] Specifically, the top plate of the middle exhaust flue cabin 513c and the bottom plate of the upper clean air delivery cabin 513b are composed of the same inclined second inclined plate 513e, so that the cross-sectional area of ​​the upper clean air delivery cabin 513b in the front-to-back direction gradually increases along the gas delivery direction.

[0168] Specifically, the first box body 51 and the second box body 52 are both rectangular boxes; the top height of the second box body 52 is higher than the top height of the first box body 51 and forms a turning flow channel inside to connect the upper part of the front gas collecting chamber 521 and the upper part of the rear SCR denitration reaction chamber 522.

[0169] Specifically, the integrated dust removal and denitrification equipment also includes: an ash hopper is provided at the bottom of the original air chamber at the bottom of each left dust collector and the bottom of the original air chamber at the bottom of each right dust collector, and an ash unloading device is provided at the bottom of each ash hopper.

[0170] Specifically, the lower air intake flue chamber 513a is connected to the side of each ash hopper through an independent air intake manifold, and an air intake valve is installed on each air intake manifold.

[0171] Specifically, at least two layers of SCR denitration catalyst beds 523 arranged up and down are provided in the rear SCR denitration reaction chamber 522 .

[0172] Specifically, the SCR denitration catalyst used in the SCR denitration catalyst bed is a medium-high temperature SCR denitration catalyst or a low-temperature SCR denitration catalyst.

[0173] The above-mentioned integrated dust removal and denitrification equipment has the appearance characteristics of a combination of a large box (first box) and a small box (second box), and the small box is located at the rear of the large box. Among them, the upper clean air conveying cabin of the large box combined with the connection relationship between the small box and the large box is the key innovation of the integrated dust removal and denitrification equipment. Since the small box is located at the rear of the large box, the large box does not need to bear the weight of the small box, thereby reducing the structural strength requirements of the large box. The large box guides the airflow into the small box through the upper clean air conveying cabin, which simply realizes the connection between the large box and the small box. The advantages of the above-mentioned integrated dust removal and denitrification equipment are simple structure and can save construction costs.

[0174] Finite element analysis of the temperature field shows that when the intermediate flue main cabin body 513 has a middle exhaust flue cabin 513c located between the lower air intake flue cabin 513a and the upper clean air conveying cabin 513b, the middle exhaust flue cabin 513c extends in the front-to-back direction, the lower exhaust port of the rear SCR denitrification reaction cabin is connected to the rear end of the middle exhaust flue cabin 513c, and the total air intake port of the lower air intake flue cabin 513a and the total exhaust port of the middle exhaust flue cabin 513c are arranged on the front side of the first box body 51, the lower air intake flue cabin 513a, the middle exhaust flue cabin 513c and the upper clean air conveying cabin 513b of the intermediate flue main cabin body 513 are all filled with flue gas, the temperature distribution of the first box body 51 is generally uniform, and the thermal deformation of the flue gas dust removal part in the integrated dust removal and denitrification equipment is small. In addition, flow field analysis shows that there are airflow turns at the upper and lower ends of the rear SCR denitration reaction chamber 522, and the airflow velocity in the rear SCR denitration reaction chamber 522 is evenly distributed, which helps to reduce the impact of the airflow on the SCR denitration catalyst and avoid the breakage of the SCR denitration catalyst.

[0175] In the industrial silicon smelting flue gas treatment system of Example 3 and the industrial silicon smelting flue gas treatment system of Example 5, the high temperature resistant flue gas filter dust collector 121 and the low temperature SCR denitrification device 142 can be integrated into the above-mentioned dust removal and denitrification integrated equipment.

[0176] The above is a description of the relevant contents of the present disclosure. A person skilled in the art will be able to implement the present disclosure based on these descriptions. Based on the above contents of this specification, all other embodiments obtained by a person skilled in the art without making any creative work shall fall within the scope of patent protection.

Claims

1. An industrial silicon smelting flue gas purification system, characterized by: include: A flue gas cooling device, used to receive the flue gas discharged from the industrial silicon furnace and output the flue gas to be purified which is cooled to a temperature less than or equal to C1°C when the flue gas and the industrial silicon furnace are operating normally; A flue gas dust removal device, used for performing dust removal treatment on the flue gas to be purified so as to reduce the dust content in the flue gas to be purified to within a set dust content range; A flue gas desulfurization device, used for performing desulfurization treatment on the flue gas to be purified so as to reduce the sulfur dioxide content in the flue gas to be purified to within a set sulfur dioxide content range; A flue gas denitration device, used for performing a denitration treatment on the flue gas to be purified so as to reduce the nitrogen oxide content in the flue gas to be purified to within a set nitrogen oxide content range; A flue gas driving device, used for driving the flue gas to be purified so that the flue gas to be purified passes through the industrial silicon smelting flue gas purification system; The flue gas dust removal device adopts a flue gas dust removal device that can withstand C2°C when the flue gas cooling device is in normal working condition, wherein the value of C2 minus C1 is ≥100°C or ≥120°C or ≥150°C or ≥200°C.

2. The industrial silicon smelting fume purification system according to claim 1, characterized in that: The flue gas dust removal device adopts a high temperature resistant flue gas filter dust collector, and the high temperature resistant flue gas filter dust collector filters and removes dust through a filter element. The filter element can withstand the flue gas to be filtered at C2°C, and C2 is 500°C.

3. An industrial silicon smelting fume purification system as claimed in claim 2, characterized in that: The filter element is a metal filter bag, a ceramic tubular filter element or a metal tubular filter element.

4. The industrial silicon smelting fume purification system according to claim 1, characterized in that: C1 takes 300℃.

5. The industrial silicon smelting fume purification system according to claim 1, characterized in that: The flue gas cooling device adopts a waste heat boiler; the flue gas dust removal device adopts a high-temperature resistant flue gas filter dust collector, and the high-temperature resistant flue gas filter dust collector filters and removes dust through a filter element; the flue gas desulfurization device adopts a wet desulfurization device; the flue gas denitrification device adopts an ozone oxidation device; the waste heat boiler, the high-temperature resistant flue gas filter dust collector, the ozone oxidation device and the wet desulfurization device are arranged in sequence from front to back, and the temperature of the flue gas to be purified output by the waste heat boiler when the waste heat boiler itself and the industrial silicon furnace are operating normally is 140°C-210°C.

6. The industrial silicon smelting fume purification system according to claim 1, characterized in that: The flue gas cooling device adopts a waste heat boiler; the flue gas dust removal device adopts a high-temperature resistant flue gas filter dust collector, and the high-temperature resistant flue gas filter dust collector filters and removes dust through a filter element; the flue gas desulfurization device adopts a dry desulfurization device; the flue gas denitrification device adopts a low-temperature SCR denitrification device; the waste heat boiler, the dry desulfurization device, the high-temperature resistant flue gas filter dust collector, and the low-temperature SCR denitrification device are arranged in sequence from front to back, and the temperature of the flue gas to be purified output by the waste heat boiler when the waste heat boiler itself and the industrial silicon furnace are operating normally is 180°C-250°C.

7. The industrial silicon smelting fume purification system according to claim 1, characterized in that: The flue gas cooling device adopts a waste heat boiler; the flue gas dust removal device adopts a high-temperature resistant flue gas filter dust collector, and the high-temperature resistant flue gas filter dust collector filters and removes dust through a filter element; the flue gas desulfurization device adopts a wet desulfurization device; the flue gas denitrification device adopts a low-temperature SCR denitrification device; the waste heat boiler, the high-temperature resistant flue gas filter dust collector, the low-temperature SCR denitrification device and the wet desulfurization device are arranged in sequence from front to back, and the temperature of the flue gas to be purified output by the waste heat boiler when the waste heat boiler itself and the industrial silicon furnace are operating normally is 180℃-250℃.

8. The industrial silicon smelting fume purification system according to claim 1, characterized in that: The flue gas cooling device adopts a waste heat boiler; the flue gas dust removal device adopts a high-temperature resistant flue gas filter dust collector, and the high-temperature resistant flue gas filter dust collector filters and removes dust through a filter element; the flue gas desulfurization device adopts a dry desulfurization device; the flue gas denitrification device adopts a low-temperature SCR denitrification device; the waste heat boiler, the high-temperature resistant flue gas filter dust collector, the dry desulfurization device, and the low-temperature SCR denitrification device are arranged in sequence from front to back, and the temperature of the flue gas to be purified output by the waste heat boiler when the waste heat boiler itself and the industrial silicon furnace are operating normally is 180°C-250°C, and a second dust removal device is also provided between the dry desulfurization device and the low-temperature SCR denitrification device.

9. The industrial silicon smelting fume purification system according to claim 1, characterized in that: The flue gas cooling device adopts a waste heat boiler; the flue gas dust removal device adopts a high-temperature resistant flue gas filter dust collector, and the high-temperature resistant flue gas filter dust collector filters and removes dust through a filter element; the flue gas desulfurization device adopts a dry desulfurization device; the flue gas denitrification device adopts a low-temperature SCR denitrification device; the waste heat boiler, the high-temperature resistant flue gas filter dust collector, the low-temperature SCR denitrification device, and the dry desulfurization device are arranged in sequence from front to back, and the temperature of the flue gas to be purified output by the waste heat boiler when the waste heat boiler itself and the industrial silicon furnace are operating normally is 180°C-250°C, and a second dust removal device is also provided after the dry desulfurization device.

10. The industrial silicon smelting fume purification system according to claim 1, characterized in that: An industrial silicon furnace flue gas emergency conveying bypass connected in parallel with the flue gas cooling device is arranged beside the flue gas cooling device, a cooling gas input pipeline is connected to the industrial silicon furnace flue gas emergency conveying bypass, valves are arranged at the inlet of the industrial silicon furnace flue gas emergency conveying bypass, the inlet of the flue gas cooling device and the inlet of the cooling gas input pipeline, and a cooling gas intake device is connected to the inlet of the cooling gas input pipeline; And / or, the smoke driving device adopts a variable frequency fan.

Images