CN113521892B

CN113521892B - Flue gas dust removal system

Info

Publication number: CN113521892B
Application number: CN202110720375.5A
Authority: CN
Inventors: 李仲恺; 何志; 赵聪; 刘超; 杨光耀
Original assignee: Sichuan Sidaneng Environmental Protection Technology Co ltd
Current assignee: Sichuan Sidaneng Environmental Protection Technology Co ltd
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2023-04-07
Anticipated expiration: 2041-06-28
Also published as: CN113521892A

Abstract

The application discloses flue gas dust removal system, this flue gas dust removal system can be used to the dust removal purification of kiln flue gas such as the high temperature flue gas that produces of smelting in microcrystalline glass production technology, reduces the flue gas temperature fluctuation to the adverse effect that dust removal purification produced. This flue gas dust pelletizing system includes: the flue gas temperature control device is used for promoting the balance of the temperature of the flue gas output by the flue gas temperature control device by carrying out heat transfer on a heat storage element arranged on a flue gas running flow path in the flue gas temperature control device and the flue gas passing through the heat storage element; and the flue gas filtering device receives the flue gas output by the flue gas temperature control device and physically intercepts solid particles in the flue gas to be filtered as the flue gas to be filtered through a high-temperature-resistant filter material so as to realize gas-solid separation.

Description

Flue gas dust removal system

Technical Field

The embodiment of the application relates to a flue gas dust removal system.

Background

Microcrystalline glass, also known as ceramic glass, is an inorganic nonmetallic material that is formed by uniformly precipitating a large number of fine crystals in glass to form a multi-phase composite containing a dense microcrystalline phase and a glass phase. The microcrystalline glass has the dual characteristics of glass and ceramic, has higher brightness than the ceramic and stronger toughness than the glass, and can be particularly used as a building decoration material with stronger market competitiveness. The production process of the microcrystalline glass can be mainly divided into a sintering method, a rolling method, a casting method and the like, wherein the sintering method and the rolling method are most common. In general: the production process flow of the sintering method can be divided into burdening, smelting, water quenching, crushing, screening, die filling, sintering and polishing; the production process flow of the rolling method can be divided into material preparation, smelting, rolling molding, heat treatment (crystallization), annealing and polishing; the production process flow of the casting method can be divided into material preparation, smelting, casting and molding, heat treatment (crystallization), annealing and polishing. The processes all need to carry out smelting treatment on the mixed raw materials after the ingredients so as to extract molten glass, but how to prepare the molten glass into the glass ceramics is the main difference of the production processes.

At present, the industry has increasingly raised requirements on energy conservation and emission reduction of a microcrystalline glass production process, and energy consumption and emission of atmospheric pollutants are often required to be reduced. However, the existing microcrystalline glass preparation process lacks a measure for scientifically and effectively combining optimization of the microcrystalline glass production process with the industrial kiln flue gas treatment scheme, so that the energy-saving and emission-reducing effects in the field of microcrystalline glass production are not obvious.

In addition, because the existing microcrystalline glass production process needs to provide cooling water for the submerged arc furnace (electric furnace) for smelting treatment and process water for the polishing and grinding section simultaneously, the two paths of water supply are independent from each other and lack corresponding treatment measures, so that in the microcrystalline glass production process, the water consumption is high, the fault of the submerged arc furnace water cooling system is easily caused due to the poor quality of the cooling water, and in addition, the process water provided for the polishing and grinding section cannot be effectively recovered after being changed into sewage, thereby causing environmental pollution.

Disclosure of Invention

The embodiment of the application provides a flue gas dust removal system, and the flue gas dust removal system can be used for dust removal and purification of kiln flue gas such as high-temperature flue gas generated by smelting in a microcrystalline glass production process, and can reduce adverse effects of flue gas temperature fluctuation on dust removal and purification.

According to an aspect of the present application, there is provided a flue gas dust removal system comprising: the flue gas temperature control device is used for promoting the balance of the temperature of the flue gas output by the flue gas temperature control device by carrying out heat transfer on a heat storage element arranged on a flue gas running flow path in the flue gas temperature control device and the flue gas passing through the heat storage element; and the flue gas filtering device receives the flue gas output by the flue gas temperature control device and physically intercepts solid particles in the flue gas to be filtered as the flue gas to be filtered through a high-temperature-resistant filter material so as to realize gas-solid separation.

According to the embodiment of the flue gas dust removal system, the heat storage elements are respectively provided with a plurality of channels which are communicated in the vertical direction, and the plurality of channels which are communicated in the vertical direction form the flue gas running flow path.

According to the embodiment of the flue gas dust removal system, the heat storage element is arranged in the flue gas temperature control device in a vertical mode; the channels are formed by gaps between the heat storage elements in spaced apart arrangement and/or by through-holes integral with the heat storage elements.

According to the embodiment of the flue gas dust removal system, the flue gas inlet of the flue gas temperature control device is positioned above the heat storage element, and the flue gas outlet of the flue gas temperature control device is positioned below the heat storage element.

According to the embodiment of the flue gas dust removal system, the flue gas temperature control device is also provided with a soot blower, and the soot blower is positioned above the heat storage element; and a downward gas spraying head is arranged on the soot blower, and the gas spraying action range of the gas spraying head on the soot blower covers the upper ports of the plurality of channels which are communicated in the vertical direction during operation.

According to the embodiment of the flue gas dust removal system, the flue gas temperature control device is also provided with a mechanical dust removal structure, and the mechanical dust removal structure realizes gas-solid separation through mechanical force acting on solid particles of flue gas; the mechanical dust removing structure is positioned in front of and/or behind the heat storage element along the flowing direction of the flue gas.

According to the embodiment of the flue gas dust removal system, the mechanical dust removal structure realizes gas-solid separation by gravity/inertia force/centrifugal force acting on solid particles of flue gas.

According to the embodiment of the flue gas dust removal system, the flue gas temperature control device is provided with the cylindrical shell, the lower part of the cylindrical shell is provided with the ash bucket, the heat storage element is arranged in the cylindrical shell and is positioned above the ash bucket, the flue gas inlet of the flue gas temperature control device is arranged on one side of the cylindrical shell or the top of the cylindrical shell and is positioned above the heat storage element, the flue gas outlet of the flue gas temperature control device is positioned on one side of the ash bucket, a plurality of channels which are communicated in the vertical direction are respectively arranged in the heat storage element, and the plurality of channels which are communicated in the vertical direction form the flue gas operation flow path.

According to the embodiment of the flue gas dust removal system, the heat storage element is formed by assembling a plurality of heat storage bricks respectively made of heat storage materials; and a plurality of through holes for forming the channels are distributed on each heat storage brick.

According to the embodiment of the flue gas dust removal system, the flue gas temperature control device is also provided with a heating device; the heating device comprises any one or more of a heating and heat-preserving jacket arranged on the shell of the smoke temperature control device, an electric heater which is positioned in the front and/or the rear of the heat storage element in the smoke temperature control device along the flow direction of smoke, and an electric heater integrated in the heat storage element.

According to the embodiment of the flue gas dust removal system, the flue gas filtering device is a built-in high-temperature-resistant filter material, and belongs to a flue gas filter of a metal filter material or a ceramic filter material.

When the flue gas dust removal system is used for dust removal and purification of kiln flue gas such as high-temperature flue gas generated by smelting in a microcrystalline glass production process, the flue gas filtering device can physically intercept solid particles in the flue gas through the high-temperature-resistant filtering material so as to realize gas-solid separation and ensure the dust removal efficiency. In addition, the temperature of high-temperature flue gas generated by smelting in the microcrystalline glass production process often fluctuates greatly along with the fluctuation of furnace conditions, and the normal operation of the flue gas filtering device can be influenced by the large fluctuation of the flue gas temperature. The traditional solution measures are mainly to heat and preserve the temperature of the flue gas so as to prevent the temperature of the flue gas from suddenly dropping. But the heating and heat preservation consume energy, which is not beneficial to energy conservation and emission reduction. Therefore, the smoke temperature control device creatively adopts the heat storage element, the heat storage element can absorb heat from smoke and store the heat in the heat storage element when the smoke temperature is higher, and the heat storage element can transmit the heat to the smoke when the smoke temperature is reduced, so that the smoke temperature is prevented from being too low, the external energy consumption is reduced, and the filtering capacity of the high-temperature-resistant filter material caused by sudden drop of the smoke temperature can be prevented from being obviously reduced. The heat storage element can prevent the temperature of the flue gas from dropping, and can also reduce the temperature of the high-temperature flue gas by absorbing the heat in the flue gas, thereby playing the role of promoting the balance of the temperature of the flue gas output by the flue gas temperature control device, and effectively solving the problem that the high-temperature resistant filter material is damaged due to thermal vibration. Therefore, the flue gas dust removal system can be used for dust removal and purification of kiln flue gas such as high-temperature flue gas generated by smelting in a microcrystalline glass production process, and adverse effects of flue gas temperature fluctuation on dust removal and purification are reduced.

The embodiments of the present application will be further described with reference to the drawings and the detailed description. Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments provided herein.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to assist in understanding the relevant embodiments, and the description of which is provided in this application and is not intended to limit the relevant embodiments unduly. In the drawings:

fig. 1 is a schematic view of an overall structure of a microcrystalline glass production line provided in an embodiment of the present application, and a corresponding microcrystalline glass production process can be reflected by the schematic view.

Fig. 2 is a schematic structural diagram of a flue gas treatment device in a raw material drying section in a microcrystalline glass manufacturing process according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a flue gas treatment device in a raw material pre-reduction section in a microcrystalline glass preparation process according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a flue gas treatment device in a raw material melting section in a microcrystalline glass manufacturing process according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a flue gas temperature control device in a flue gas dust removal system according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a heat storage element of a medium smoke temperature control device according to an embodiment of the present application.

Fig. 7 is a schematic structural diagram of a water treatment device in a microcrystalline glass manufacturing process provided in an embodiment of the present application.

Detailed Description

The embodiments of the present application will be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art, with the benefit of this disclosure, will be able to implement the embodiments presented herein. Before the embodiments disclosed in the present application are explained with reference to the drawings, it should be particularly pointed out that:

the technical solutions and features provided in the respective sections including the following description in the present application may be combined with each other without conflict.

Reference in the following description generally refers to only some embodiments of the present disclosure, but not to all embodiments thereof, and therefore, all other embodiments that may be obtained by one of ordinary skill in the art without making an inventive contribution should be included within the scope of the present disclosure as claimed in the corresponding embodiments thereof.

The terms "comprising," "including," "having," and any variations thereof in this specification and claims and in any related parts thereof, are intended to cover non-exclusive inclusions. The terms "first," "second," and the like are used for convenience in distinguishing and may be used in combination with other embodiments to distinguish between actual objects.

The term "high temperature" as used herein means a temperature of 180 ℃ or higher, particularly 200 ℃ or higher. "high temperature resistance" refers to the properties designed for use under the temperature conditions described above.

Fig. 1 is a schematic structural diagram of a microcrystalline glass production line provided in an embodiment of the present application. As shown in fig. 1, a microcrystalline glass production line comprises a raw material drying section 11, a raw material pre-reduction section 12, a raw material smelting section 13, a molten glass forming section 14, a glass plate annealing section 15, a glass plate crystallization section 16 and a microcrystalline glass polishing and grinding section 17 which are sequentially arranged along the front-back direction of a microcrystalline glass preparation process route.

Wherein, the raw material drying section 11 is used for dehydrating the corresponding raw material through the raw material drying section industrial kiln 11A. On the factory site of the microcrystalline glass production line, main raw materials are often accumulated in the open air, and the raw materials are affected with damp due to weather factors such as rain. There are other reasons that may lead to an excessive moisture content of the feedstock. The large moisture content in the raw material can increase the energy consumption in the subsequent heating process and have certain influence on the subsequent treatment. For this reason, set up raw materials drying section 11, carry out dehydration to corresponding raw materials through raw materials drying section industrial kiln 11A, raw materials drying section industrial kiln 11A sets up for the dehydration specially, can reduce the influence of the moisture in the raw materials to subsequent processing, reduces the whole energy consumption of system.

The raw material pre-reduction section 12 is used for reducing at least part of components in the raw material to metal by the raw material pre-reduction section industrial kiln 12A and performing pre-reduction treatment on the corresponding raw material by using a reducing agent. The raw material pre-reduction section 12 is arranged, and at least part of components in the raw materials are reduced into metal by using a reducing agent to carry out pre-reduction treatment on the corresponding raw materials through the industrial kiln 12A of the raw material pre-reduction section, so that the coke consumption of the raw material smelting section can be obviously reduced, and the technical and economic indexes of the raw material smelting section are improved. In addition, nitrogen and sulfur elements in the main mineral raw materials for preparing the glass ceramics can be separated in the raw material pre-reduction section 12 in the forms of nitrogen oxide and sulfur dioxide, so that flue gas desulfurization and flue gas denitration can be performed in the raw material pre-reduction section 12 in a centralized manner, and the investment for performing desulfurization and denitration in the raw material smelting section 13 can be saved. The raw material pre-reduction section industrial kiln 12A may generally employ a rotary kiln.

The raw material melting section 13 is used for performing melting processing on a mixed raw material containing the pre-reduction processed raw material through a raw material melting section industrial kiln 13A to extract a desired molten glass and obtain a by-product formed by the metal. In the raw material melting section industrial furnace 13A, a mixed raw material containing the pre-reduced raw material is melted by a melting process to form molten glass, the metal is melted into molten metal, the molten glass and the molten metal are layered with each other and can be extracted separately, and the molten metal is solidified as a by-product. The raw material melting section industrial furnace 13A generally employs a submerged arc furnace (electric furnace). In addition, the raw material melting section 13 often has a multi-stage submerged arc furnace, which can be called a first-stage microcrystal furnace and a second-stage microcrystal furnace respectively, and so on, and the core crystal agent required by the subsequent crystallization is usually added into the molten glass in the last-stage or several-stage microcrystal furnaces.

In addition, the molten glass forming section 14 is used to form the molten glass into a glass sheet. The glass plate annealing section 15 is used for annealing the glass plate. The glass plate crystallization section 16 is used for crystallizing the annealed glass plate to obtain microcrystalline glass. The microcrystalline glass polishing and grinding section 17 is used for polishing and grinding microcrystalline glass. As is clear from the description of the "background art" section of the present specification, the "molding" herein may be a rolling molding or a casting molding. In short, as is apparent from the description of "background art" in the present specification, molding, annealing, crystallization, polishing and polishing have been conventionally performed, and can be known, for example, from patent document No. CN106810076a, and thus, they are not described in detail here.

Optionally, the microcrystalline glass preparation process adopts red mud as a main raw material; the raw material drying section 11 is configured to dehydrate the red mud by using the raw material drying section industrial kiln 11A, and the raw material pre-reduction section 12 is configured to pre-reduce the dehydrated red mud by using a reducing agent by using the raw material pre-reduction section industrial kiln 12A, so that at least part of iron elements in the red mud is reduced to metallic iron. The reducing agent used in the raw material pre-reduction stage 12 may be coke powder. The mixed raw materials can comprise red mud, coke and magnesia after pre-reduction treatment. The red mud is a waste material in the aluminum industry, but can be used as a main raw material for preparing microcrystalline glass, so that the red mud is recycled, and waste is changed into valuable.

The microcrystalline glass production line shown in figure 1 is more scientific and reasonable in arrangement form and has certain energy-saving advantages. Firstly, the raw material drying section 11 is used for dehydrating the corresponding raw materials through the industrial kiln of the raw material drying section, so that the moisture in the main raw materials can be sufficiently reduced, and the energy consumption increase of the subsequent heating process caused by moisture increase of the raw materials due to the fact that the raw materials are affected with damp in a factory and the like is prevented. The raw material pre-reduction section 12 is used for pre-reducing the dehydrated raw material through a raw material pre-reduction section industrial kiln by using a reducing agent so that at least part of components in the raw material are reduced into metal, thus the coke consumption of the raw material smelting section can be obviously reduced, and the technical and economic indexes of the raw material smelting section can be improved. The raw material smelting section 13 is used for smelting mixed raw materials containing the pre-reduced raw materials through a raw material smelting section industrial furnace so as to extract required molten glass and obtain byproducts formed by the metals.

However, the microcrystalline glass production line shown in fig. 1 also has a plurality of pollution emission points, and emission reduction needs to be considered. Specifically, the method comprises the following steps: in the raw material drying section 11, the industrial kiln 11A in the raw material drying section discharges flue gas with high temperature, and the flue gas contains smoke dust. In the raw material pre-reduction section 12, the industrial kiln 12A of the raw material pre-reduction section also emits flue gas with higher temperature, and the flue gas contains smoke dust; in addition, the flue gas of the industrial furnace 12A in the raw material pre-reduction section often contains nitrogen oxides and sulfur dioxide. In the raw material smelting section 13, the raw material smelting section industrial kiln 13A discharges flue gas with higher temperature, and the flue gas contains smoke dust and raw coke oven gas. In the polishing and grinding section 17 of the microcrystalline glass, a large amount of polishing and grinding sewage is discharged.

In addition, the microcrystalline glass production line shown in fig. 1 also faces the problems of the existing microcrystalline glass production process, namely: the cooling water is required to be simultaneously provided for the submerged arc furnace (electric furnace) for smelting treatment and the processing water is required to be provided for the polishing and grinding section, the two water supplies are independent from each other in the past and lack corresponding treatment measures, so that the water consumption is higher in the running process of the microcrystalline glass production process, and the fault of a water cooling system of the submerged arc furnace is easily caused due to poor quality of the cooling water.

The following embodiments of the present application provide corresponding emission reduction schemes for each pollution emission point, and effectively utilize various resources as much as possible.

Fig. 2 is a schematic structural diagram of a flue gas treatment device in a raw material drying section in a microcrystalline glass manufacturing process according to an embodiment of the present application. The flue gas treatment device for the raw material drying section in the microcrystalline glass preparation process is used for solving the problem of emission of atmospheric pollutants of the industrial kiln 11A for the raw material drying section. As shown in fig. 1 and 2, a flue gas treatment device 110 in a raw material drying section in a microcrystalline glass manufacturing process, which is used in the raw material drying section 11, includes: the flue gas filtering device 111 physically intercepts solid particles in the flue gas to be filtered through a high-temperature-resistant filter material so as to realize gas-solid separation; the device also comprises an airflow heat exchange device 112, wherein the airflow heat exchange device 112 is used for transferring heat of the heating medium to the heated medium; a to-be-filtered flue gas inlet of the flue gas filtering device 111 is used for being connected with an exhaust port of the raw material drying section industrial kiln 11A, a filtered flue gas outlet of the flue gas filtering device 111 is used for being connected with a heating medium inlet of the airflow heat exchange device 112, and a heating medium outlet, a heated medium inlet and a heated medium outlet of the airflow heat exchange device 112 are respectively connected with a heating medium discharge end, a heated medium supply end and a combustion-supporting gas inlet of the raw material drying section industrial kiln 11A.

Through set up flue gas processing apparatus 110 in raw materials drying section 11, this flue gas processing apparatus 110 includes flue gas filter equipment 111 and air current heat transfer device 112, wherein, flue gas filter equipment 111 accessible high temperature resistant filter media carries out the physics interception to the solid particle thing in the higher flue gas of temperature that raw materials drying section industrial kiln discharged thereby realizes gas-solid separation, can both ensure dust collection efficiency and can keep filtered flue gas temperature in higher state, like this, air current heat transfer device 112 just can better utilize the temperature of filtered flue gas to heat by heating medium (like the air), by heating medium as raw materials drying section industrial kiln combustion-supporting gas entering raw materials drying section industrial kiln 11A's combustion chamber afterwards, promote raw materials drying section industrial kiln 11A thermal efficiency, and the solid particle thing in the heating medium has been more fully got rid of, also can not cause atmospheric pollution.

Optionally, in the flue gas treatment device in the raw material drying section in the microcrystalline glass preparation process, the flue gas filtering device 111 is a built-in high temperature resistant filter material, and belongs to a flue gas filter of a metal filter material or a ceramic filter material. The metal filter and the ceramic filter are filter materials having a good performance among known high-temperature resistant filter materials, have a long service life, and are suitable for use in the flue gas filter device 111.

Optionally, in the flue gas treatment device at the raw material drying section in the microcrystalline glass preparation process, the airflow heat exchange device 112 is a dividing wall type heat exchanger. The dividing wall heat exchanger is a general name of a type of heat exchanger which ensures that a heating medium and a heated medium are not contacted to transfer heat through a heat transfer wall. The specific type and kind of the dividing wall type heat exchanger are not limited herein, and the dividing wall type heat exchanger can be selected according to actual conditions.

Optionally, in the flue gas treatment device in the raw material drying section in the microcrystalline glass preparation process, the dust recovery structure of the flue gas filtering device 111 is connected to the feed inlet of the raw material pre-reduction section industrial kiln 12A through a dust conveying mechanism. Therefore, the dust recovered by the dust recovery structure of the flue gas filtering device 111 can be conveyed to the raw material pre-reduction section industrial kiln 12A through the dust conveying mechanism, so that the subsequent treatment of the dust recovered by the flue gas filtering device 111 is omitted, and the raw material loss is avoided.

Optionally, in the flue gas treatment device at the raw material drying section in the microcrystalline glass preparation process, the heating medium discharge end is a chimney. When the heating medium discharge end is a chimney, tail gas discharge can be realized through smoke flushing.

Optionally, in the flue gas treatment device at the raw material drying section in the microcrystalline glass preparation process, the supply end of the heated medium is in an external atmospheric environment. When the heated medium supply end is the external atmosphere, the heated medium is the air in the atmosphere.

Optionally, in the flue gas treatment device at the raw material drying section in the microcrystalline glass preparation process, the heated medium outlet of the airflow heat exchange device 112 is connected with the combustion-supporting gas inlet of the industrial kiln 12A at the raw material drying section through a gas mixing pipeline; the gas mixing pipeline is connected with the heated medium outlet and a gas supply source, and the gas of the gas supply source is the purified gas (stored by a gas tank 133) discharged from the raw material smelting section industrial kiln 13A.

Fig. 3 is a schematic structural diagram of a flue gas treatment device in a raw material pre-reduction section in a microcrystalline glass preparation process provided in an embodiment of the present application. The flue gas treatment device for the raw material pre-reduction section in the microcrystalline glass preparation process is used for solving the problem of emission of atmospheric pollutants in the industrial kiln 12A for the raw material pre-reduction section. As shown in fig. 1 and 3, a flue gas treatment device 120 for a raw material pre-reduction section in a microcrystalline glass manufacturing process, which is used in the raw material pre-reduction section 12, includes: the flue gas filtering device 121, the flue gas filtering device 121 physically intercepts solid particles in the flue gas to be filtered through a high-temperature resistant filter material so as to realize gas-solid separation; the device also comprises an airflow heat exchange device 123, wherein the airflow heat exchange device 123 is used for transferring the heat of the heating medium to the heated medium; a to-be-filtered flue gas inlet of the flue gas filtering device 121 is used for being connected with an exhaust port of the raw material pre-reduction section industrial kiln 12A, a filtered flue gas outlet of the flue gas filtering device 121 is used for being connected with a heating medium inlet of the airflow heat exchange device 123, and a heating medium outlet, a heated medium inlet and a heated medium outlet of the airflow heat exchange device 123 are respectively connected with a heating medium discharge end, a heated medium supply end and a combustion-supporting gas inlet of the raw material pre-reduction section industrial kiln 12A.

The flue gas treatment device 120 is arranged in the raw material pre-reduction section 12, and the flue gas treatment device 120 comprises a flue gas filter device 121 and an airflow heat exchange device 123, wherein the flue gas filter device 121 can physically intercept solid particles in flue gas with higher temperature discharged by the raw material pre-reduction section industrial kiln 12A through a high-temperature-resistant filter material so as to realize gas-solid separation, so that the dust removal efficiency can be ensured, and the temperature of the filtered flue gas can be kept at a higher state, so that the airflow heat exchange device 123 can better utilize the temperature of the filtered flue gas to heat a heated medium (such as air), and the heated medium then serves as combustion-supporting gas of the raw material pre-reduction section industrial kiln 12A to enter a combustion chamber of the raw material pre-reduction section industrial kiln 12A, thereby improving the thermal efficiency of the raw material pre-reduction section industrial kiln 12A, and the solid particles in the heated medium are sufficiently removed, so that atmospheric pollution cannot be caused.

Generally, the raw material pre-reduction section 12 can remove nitrogen and sulfur elements in main mineral raw materials for preparing the microcrystalline glass in the form of nitrogen oxide and sulfur dioxide respectively, so the flue gas of the industrial kiln 12A of the raw material pre-reduction section usually also contains the nitrogen oxide and the sulfur dioxide. In contrast, for the requirement of denitration, a flue gas SCR denitration device 122 may be disposed between the filtered flue gas outlet of the flue gas filtering device 121 and the heating medium inlet of the airflow heat exchange device 123. Because the active temperature of the SCR denitration catalyst in the SCR denitration device 122 is high, and the temperature of the filtered flue gas output by the flue gas filtering device 121 can be kept in a high state, the denitration efficiency can be ensured by using the temperature of the filtered flue gas, the need for heating the flue gas before the SCR denitration device 122 is reduced, and thus energy is saved.

The heating medium discharge end can be a flue gas desulfurization device 124 for desulfurization needs. Because the flue gas desulfurization device 124 is arranged behind the airflow heat exchange device 123, the flue gas can be desulfurized after the flue gas waste heat is fully utilized by the airflow heat exchange device 123. The mainstream flue gas desulfurization device 124 belongs to wet desulfurization, and flue gas is not required to have higher temperature, so that the flue gas waste heat can be absorbed through the airflow heat exchange device 123. In addition, when wet desulphurization is adopted, the airflow heat exchange device 123 is also equivalent to a preposed cooling device of the flue gas desulphurization device 124, so that desulphurization is more sufficient.

Optionally, in the flue gas treatment device at the raw material pre-reduction section in the microcrystalline glass preparation process, the flue gas filtration device 121 is a built-in high temperature resistant filter material, and belongs to a flue gas filter of a metal filter material or a ceramic filter material. The metal filter and the ceramic filter are known high-temperature-resistant filters having good performance, have long service life, and are suitable for use in the flue gas filter device 111.

Optionally, in the flue gas treatment device at the raw material pre-reduction section in the microcrystalline glass preparation process, the airflow heat exchange device 123 is a dividing wall type heat exchanger. The dividing wall heat exchanger is a general name of a type of heat exchanger which ensures that a heating medium and a heated medium are not contacted to transfer heat through a heat transfer wall. The specific type and kind of the dividing wall type heat exchanger are not limited herein, and the dividing wall type heat exchanger can be selected according to actual conditions.

Optionally, in the flue gas treatment device at the raw material pre-reduction section in the microcrystalline glass preparation process, the supply end of the heated medium is in an external atmospheric environment. When the heated medium supply end is the external atmosphere, the heated medium is the air in the atmosphere.

Optionally, in the flue gas treatment device at the raw material pre-reduction section in the microcrystalline glass preparation process, the heated medium outlet of the airflow heat exchange device 123 is connected with the combustion-supporting gas inlet of the industrial kiln at the raw material pre-reduction section through a gas mixing pipeline; the gas mixing pipeline is connected with the heated medium outlet and the fuel gas supply source.

Fig. 4 is a schematic structural diagram of a flue gas treatment device in a raw material melting section in a microcrystalline glass manufacturing process according to an embodiment of the present application. The raw material smelting section flue gas treatment device in the microcrystalline glass preparation process is used for solving the problem of emission of atmospheric pollutants in a raw material smelting section industrial kiln 13A. Fig. 5 is a schematic structural diagram of a flue gas temperature control device in a flue gas dust removal system according to an embodiment of the present application. Fig. 6 is a schematic structural diagram of a heat storage element of a medium flue gas temperature control device according to an embodiment of the present application. As shown in fig. 1,4-6, a flue gas treatment apparatus 130 in a raw material melting section in a microcrystalline glass production process, which is used in the raw material melting section 13, includes: a flue gas temperature control device 131, wherein the flue gas temperature control device 131 promotes the balance of the temperature of the flue gas output by the flue gas temperature control device 131 by performing heat transfer with the flue gas passing through a heat storage element 1313 arranged on a flue gas running flow path in the flue gas temperature control device 131; the flue gas temperature control device 131 is used for controlling the temperature of the flue gas to be filtered, and the flue gas temperature control device 132 is used for controlling the temperature of the flue gas to be filtered; the flue gas inlet of the flue gas temperature control device 131 is used for being connected with the exhaust port of the raw material smelting section industrial kiln 13A, the flue gas outlet of the flue gas temperature control device 131 is used for being connected with the flue gas inlet to be filtered of the flue gas filtering device 132, and the filtered flue gas outlet of the flue gas filtering device 132 is used for being connected with a gas cabinet 133 or gas using equipment.

In the operation process of the raw material smelting section industrial kiln 13A, especially the submerged arc furnace, the temperature of the high-temperature flue gas discharged by the furnace often fluctuates greatly along with the fluctuation of the furnace conditions, and the normal operation of the flue gas filtering device 132 is affected by the large fluctuation of the flue gas temperature, especially, the large fluctuation of the flue gas temperature not only easily causes the high-temperature resistant filtering material to be damaged due to thermal vibration, but also causes the liquid precipitated from the flue gas due to the temperature change to be attached to the surface of the high-temperature resistant filtering material, so that the filtering capability of the high-temperature resistant filtering material is remarkably reduced, and the normal operation of the flue gas filtering device 132 is affected. The traditional solution measures are mainly to heat and preserve the temperature of the flue gas so as to prevent the temperature of the flue gas from suddenly dropping. But the heating and heat preservation consume energy, which is not in accordance with the purposes of energy conservation and emission reduction. Therefore, the flue gas temperature control device 131 creatively adopts the heat storage element 1313, the heat storage element 1313 can absorb heat from the flue gas and store the heat in the heat storage element 1313 when the temperature of the flue gas is high, and when the temperature of the flue gas drops, the heat storage element 1313 can transfer the heat to the flue gas to prevent the temperature of the flue gas from being too low, so that the consumption of external energy is reduced, and the filtering capacity of the high-temperature-resistant filter material caused by sudden drop of the temperature of the flue gas can be prevented from being remarkably reduced. The heat storage element 1313 can not only prevent the temperature of the flue gas from dropping, but also reduce the temperature of the high-temperature flue gas by absorbing the heat in the flue gas, thus playing a role in promoting the balance of the temperature of the flue gas output by the flue gas temperature control device 131, and effectively solving the problem that the high-temperature resistant filter material is damaged due to thermal vibration.

It should be particularly emphasized that, the above-mentioned flue gas temperature control device 131 and the flue gas filtering device 132 are combined to be used as a dust removal system, and the flue gas temperature control device 131 balances the flue gas temperature through a heat storage manner, so that the flue gas temperature can be prevented from being too high, and the flue gas temperature can be prevented from being too low, so to speak, an ideal flue gas temperature control means to be filtered is found for the flue gas filtering device 132 using the high temperature resistant filtering material, and a technical problem which is not well solved for a long time in the field of high temperature flue gas filtering is solved, and the flue gas temperature control device is also a significant innovation achievement in the present application. Because the flue gas temperature is balanced in a heat storage mode, the dust removal system does not object to the phenomenon of unstable furnace conditions which troubles the application of the high-temperature flue gas filtering technology in the past any more, and on the contrary, the flue gas temperature fluctuation caused by unstable furnace conditions can promote heat storage or heat release.

Optionally, in the raw material smelting section flue gas treatment device in the microcrystalline glass preparation process, the flue gas filtering device 132 is a built-in high temperature resistant filter material, and belongs to a flue gas filter of a metal filter material or a ceramic filter material. In the same way, the metal filter material and the ceramic filter material are known filter materials with better performance in high-temperature resistant filter materials, have longer service life and are more suitable for being used in the flue gas filter device 111.

As shown in fig. 5, in an alternative embodiment, the flue gas temperature control device 131 specifically adopts the following structure: the flue gas temperature control device 131 is provided with a cylindrical shell 1311, an ash bucket 1312 is arranged at the lower part of the cylindrical shell 1311, the heat storage element 1313 is arranged in the cylindrical shell 1311 and is positioned above the ash bucket 1312, a flue gas inlet 1314 of the flue gas temperature control device 131 is arranged at one side of the cylindrical shell 1311 or at the top of the cylindrical shell 1311 and is positioned above the heat storage element 1313, a flue gas outlet 1315 of the flue gas temperature control device 131 is positioned at one side of the ash bucket 1312, a plurality of passages 13131 penetrating in the vertical direction are respectively arranged in the heat storage element 1313, and the passages 13131 penetrating in the vertical direction form the flue gas operation flow path.

The flue gas temperature control device 131 of the above structure has at least the following features: first, since the heat storage element 1313 is provided with a plurality of passages penetrating in the up-down direction, which constitute the flue gas running flow path, respectively, the flue gas flows up and down in the passages of the heat storage element 1313, and solid particulate matter (soot) in the flue gas is easily discharged from the passages of the heat storage element 1313 by gravity or the combination of gravity and other external force, and the passages of the heat storage element 1313 are not easily clogged. Secondly, since the flue gas inlet 1314 of the flue gas temperature control device 131 is arranged at one side of the cylindrical shell 1311 or at the top of the cylindrical shell 1311 and is positioned above the heat storage element 1313, and the flue gas outlet 1315 of the flue gas temperature control device 131 is positioned at one side of the ash bucket 1312, the flue gas passes through the heat storage element 1313 from top to bottom, namely the flue gas flow direction is consistent with the gravity direction, so that the channel blockage of the heat storage element 1313 is further prevented. In addition, when the flue gas passes through the heat storage element 1313 and then turns to enter the flue gas outlet 1315, the design for changing the flow direction of the flue gas is equivalent to a mechanical dust removal structure, and the mechanical dust removal structure realizes gas-solid separation by mechanical force (gravity, or inertia force or centrifugal force, etc.) acting on solid particles of the flue gas, so that the flue gas is subjected to dust removal and purification. In addition, as the heat storage element 1313 and the mechanical dust removal structure are arranged up and down, the transverse space of the flue gas temperature control device 131 can be saved, and the field arrangement of the flue gas temperature control device 131 is facilitated.

It is understood that the above-mentioned mechanical dust removing structure is only one specific embodiment of the flue gas temperature control device 131 of the present application. In other embodiments of the flue gas temperature control device 131 of the present application, the mechanical dust removing structure may be located in front of the heat storage element 1313 along the flow direction of the flue gas, the specific structure of the mechanical dust removing structure may be changed in any way, and even the heat storage element 1313 and the mechanical dust removing structure may be arranged along the horizontal direction.

On the basis of the flue gas temperature control device 131 shown in fig. 5, a soot blower 1316 is further arranged in the cylindrical shell 1311 above the heat storage element 1313, a downward gas nozzle is arranged on the soot blower 1316, and the gas injection action range of the gas nozzle on the soot blower 1316 covers the upper end ports of the plurality of passages which are communicated in the up-down direction when the soot blower 1316 is in operation. The soot blowers 1316 may be configured to move laterally along the tubular housing 1311 to increase the range of the blowing action of the jets heads on the soot blowers 1316. The sootblower 1316 operates in a similar manner to the blowback arrangement of prior art filter dusters by connecting to a gas bag to direct compressed gas into the sootblower 1316 and out of the showerhead of the sootblower 1316 to unblock the passage of the thermal storage member 1313.

Optionally, the heat storage element 1313 is assembled by a plurality of heat storage bricks 1313A made of heat storage materials; a plurality of through holes 13131 for forming the channels are distributed on each heat storage brick 1313A. The heat storage material may be selected from existing heat storage materials such as clay and the like.

Optionally, a heating device may be further disposed in the flue gas temperature control device 131; the heating means may include any one or more of a heating insulation jacket provided on the outer shell of the flue gas temperature control means 131, an electric heater provided in the flue gas temperature control means 131 at the front and/or rear of the heat storage member 1313 in the flow direction of flue gas, and an electric heater integrated in the heat storage member 1313.

It can be understood that the heating device is mainly provided to increase the temperature of the flue gas by the heating device when the temperature of the flue gas discharged from the raw material smelting section industrial furnace 13A is relatively low for a long time or the initial temperature of the flue gas discharged from the raw material smelting section industrial furnace 13A is relatively low and the heat storage element 1313 cannot maintain the temperature of the flue gas required by the subsequent flue gas filtering device 132.

As shown in fig. 6, one specific embodiment of the heating device of the flue gas temperature control device 131 of the present application is: the heat storage elements 1313 are composed of a plurality of layers of heat storage bricks 1313A stacked up and down and are arranged in the flue gas temperature control device 131 in a vertical manner, electric heaters 1313B in a layered structure are laid between two adjacent layers of heat storage bricks 1313A, the electric heaters 1313B in the layered structure can adopt ceramic electric heaters, and through holes corresponding to the through holes 13131 are arranged in the electric heaters 1313B in the layered structure.

As shown in fig. 6, the electric heater 1313B with a layered structure is laid between two adjacent layers of heat storage bricks 1313A, so that the heat storage bricks 1313A can be heated uniformly, and heat can be transferred to the passing flue gas by the heat storage bricks 1313A. In addition, the heating device has a simple structure, saves space, and does not cause difficulty in the design of the flue gas temperature control device 131.

Fig. 7 is a schematic structural diagram of a water treatment device in a microcrystalline glass manufacturing process according to an embodiment of the present application. The water treatment device in the microcrystalline glass preparation process is used for solving the problem that a large amount of polishing and grinding sewage is discharged from the microcrystalline glass polishing and grinding section 17. As shown in fig. 1 and 7, a water treatment device 140 in a microcrystalline glass manufacturing process includes: the membrane filtering device 141 is used for performing solid-liquid separation and purification on water to be purified through a membrane filtering element, wherein the filtering precision of the water to be purified is higher than the nanofiltration level; the water circulation device comprises a water circulation loop 142 and a sewage purification device 143 positioned on the water circulation loop 142, wherein a purified water receiving end A, a purified water supply end B and a sewage recovery end C are sequentially arranged on the water circulation loop 142, and the sewage purification device 143 is positioned between the sewage recovery end C and the purified water supply end B; the water purification output end of the membrane filtration device 141 is used for providing cooling water for the raw material melting section industrial kiln 13A, the concentrated water output end of the membrane filtration device 141 is used for being connected with the water purification receiving end a on the water circulation loop 142, the water purification supply end B on the water circulation loop 142 is used for providing polishing and grinding water for the microcrystalline glass polishing and grinding processing section 17, and the sewage recovery end C on the water circulation loop 142 is used for recovering polishing and grinding processing sewage generated by the microcrystalline glass polishing and grinding processing section 17.

In addition, the water treatment apparatus 140 may further include a sewage concentration apparatus 144, and a sewage inlet to be concentrated of the sewage concentration apparatus 144 is connected to a sewage discharge end of the sewage purification apparatus 143. The sewage concentration device 143 may include a filter press. Alternatively, the inlet of the membrane filtration device 141 for water to be purified may be connected to a source of tap water.

The membrane filtering device 141 performs solid-liquid separation and purification with the filtering precision higher than the nanofiltration level on the water to be purified through the membrane filtering element, that is, the membrane filtering device 141 can realize nanofiltration or reverse osmosis, so that the water purifying output end of the membrane filtering device 141 can output high-purity cooling water, and the problem of faults of the submerged arc furnace water cooling system caused by poor water quality of the cooling water is prevented. Since the water quality requirement of the polishing process water required by the microcrystalline glass polishing process section 17 is not too high, the water output from the concentrate output end of the membrane filtration device 141 is supplied as polishing process water to the microcrystalline glass polishing process section 17 through the purified water supply end B on the water circulation circuit 142. And the sewage recovery end C of the water circulation loop 142 can recover polishing and grinding sewage generated by the microcrystalline glass polishing and grinding section 17, and then the polishing and grinding sewage is recovered to the sewage purification device 143 through the water circulation loop 142. The sewage purification device 143 can purify the polishing processing sewage by various feasible sewage treatment measures, such as membrane filtration, physical clarification, chemical clarification, etc., the purified water is recycled to the polishing processing section 17, and the concentrated water generated during purification can enter the sewage concentration device 143 for concentration treatment.

The water treatment device 140 in the microcrystalline glass preparation process combines two water supplies, namely, cooling water is supplied to the submerged arc furnace (electric furnace) for smelting treatment and processing water is supplied to the polishing section 17, so that the problems that a water cooling system of the submerged arc furnace is easy to break down, polishing processing sewage cannot be effectively recycled and the like are solved.

The contents of the embodiments provided in the present application are explained above. Those of ordinary skill in the art, with the benefit of this disclosure, will be able to implement the embodiments presented herein. Based on the above disclosure provided by the present application, all other embodiments obtained by a person of ordinary skill in the art without any creative effort shall fall within the protection scope of the related invention/utility model provided by the present application.

Claims

1. A flue gas dust removal system, comprising:

the flue gas temperature control device is used for promoting the balance of the temperature of the flue gas output by the flue gas temperature control device by carrying out heat transfer on a heat storage element arranged on a flue gas running flow path in the flue gas temperature control device and the flue gas passing through the heat storage element; and

the flue gas filtering device receives the flue gas output by the flue gas temperature control device and physically intercepts solid particles in the flue gas to be filtered as the flue gas to be filtered through a high-temperature-resistant filter material so as to realize gas-solid separation;

a plurality of channels which are communicated in the vertical direction are respectively arranged in the heat storage elements, and the plurality of channels which are communicated in the vertical direction form the flue gas running flow path;

the heat storage element is arranged in the flue gas temperature control device in a vertical mode; the channels are formed by through holes integral with the heat storage element;

the heat storage element is formed by splicing a plurality of heat storage bricks respectively made of heat storage materials; a plurality of through holes for forming the channels are distributed on each heat storage brick;

the heat storage element is composed of a plurality of layers of heat storage bricks which are overlapped up and down and is arranged in the smoke temperature control device in a vertical mode, an electric heater with a layered structure is laid between every two adjacent layers of heat storage bricks, and through holes corresponding to the through holes are formed in the electric heater with the layered structure.

2. The flue gas dust removal system of claim 1, wherein: the flue gas inlet of the flue gas temperature control device is positioned above the heat storage element, and the flue gas outlet of the flue gas temperature control device is positioned below the heat storage element.

3. The flue gas dedusting system of claim 2, wherein: a soot blower is also arranged in the flue gas temperature control device and is positioned above the heat storage element; and a downward gas spraying head is arranged on the soot blower, and the gas spraying action range of the gas spraying head on the soot blower covers the upper ports of the plurality of channels which are communicated along the vertical direction when the soot blower works.

4. The flue gas dedusting system of claim 1, wherein: the flue gas temperature control device is also provided with a mechanical dust removal structure, and the mechanical dust removal structure realizes gas-solid separation through mechanical force acting on solid particles of the flue gas; the mechanical dust removing structure is positioned in front of and/or behind the heat storage element along the flow direction of the flue gas.

5. The flue gas dedusting system of claim 4, wherein: the mechanical dust removal structure is a mechanical dust removal structure which realizes gas-solid separation through gravity/inertia force/centrifugal force acting on solid particles of the flue gas.

6. The flue gas dedusting system of claim 1, wherein: the flue gas temperature control device is provided with a cylindrical shell, the lower part of the cylindrical shell is provided with an ash bucket, the heat storage element is arranged in the cylindrical shell and is positioned above the ash bucket, the flue gas inlet of the flue gas temperature control device is arranged on one side of the cylindrical shell or on the top of the cylindrical shell and is positioned above the heat storage element, and the flue gas outlet of the flue gas temperature control device is positioned on one side of the ash bucket.

7. The flue gas dust removal system of claim 1, wherein: the flue gas temperature control device is also provided with a heating device; the heating device comprises a heating and heat-preserving jacket arranged on the shell of the flue gas temperature control device, and any one or more electric heaters positioned in the front and/or the rear of the heat storage element in the flue gas flow direction in the flue gas temperature control device.

8. The flue gas dedusting system of claim 1, wherein: the flue gas filter device is a built-in high temperature resistant filter material, and belongs to a flue gas filter of a metal filter material or a ceramic filter material.