CN115371445A

CN115371445A - Yellow phosphorus flue gas purification system and industrial kiln flue gas purification device

Info

Publication number: CN115371445A
Application number: CN202210670334.4A
Authority: CN
Inventors: 高麟; 蒋敏; 任德忠; 林士全; 曾伍祥; 吴志强; 蒲柏林
Original assignee: Intermet Technology Chengdu Co Ltd
Current assignee: Intermet Technology Chengdu Co Ltd
Priority date: 2022-06-14
Filing date: 2022-06-14
Publication date: 2022-11-22

Abstract

The invention discloses a yellow phosphorus flue gas purification system and an industrial kiln flue gas purification device. Yellow phosphorus gas cleaning system includes: the device comprises a smoke overpressure protection device, a smoke filtering and dedusting device and a yellow phosphorus condensation and recovery device, wherein the smoke overpressure protection device comprises a cylindrical container, an opening at one side of the cylindrical container is connected with the phosphorus furnace through a first vertical inclined pipe, an opening at the other side of the cylindrical container is connected with the smoke filtering and dedusting device through a second vertical inclined pipe, and an opening at the bottom of the cylindrical container is inserted below the liquid level of a water seal tank; the water seal tank is provided with a closed space and an open space which form a communicating vessel, the bottom opening of the cylindrical container is inserted below the liquid level of the closed space, and the upper space of the liquid level of the closed space in the water seal tank is connected with the diffusing tower or the yellow phosphorus condensation recovery device through a pipeline. When the pressure of the phosphorus furnace rises suddenly, the flue gas overpressure protection device can effectively prevent the flue gas filtering and dust removing device from damaging equipment due to the rise of the pressure.

Description

Yellow phosphorus flue gas purification system and industrial kiln flue gas purification device

Technical Field

The embodiment of the application relates to the technical field of flue gas purification, in particular to a yellow phosphorus flue gas purification system, an industrial kiln flue gas purification device, a flue gas pretreatment device, a flue gas filtering and dust removing device, flue gas filtering and dust removing equipment and a filter element regeneration method of the flue gas filtering and dust removing equipment.

Background

Yellow phosphorus is an extremely important basic industrial raw material, is mainly used in the fields of chemical industry, pesticides, military and the like, and particularly the increase of the demand of the lithium iron phosphate battery at present further promotes the demand of yellow phosphorus. Due to high energy consumption, heavy pollution and outstanding environmental risk problems in yellow phosphorus production, developed countries have stopped producing yellow phosphorus for many years, and China is currently the main producing country of yellow phosphorus. In recent years, with the increasing of environmental protection, the yellow phosphorus production process is promoted to develop into a very important issue for the phosphorus chemical industry in the green direction.

The applicant of the present application has been actively developing and popularizing the green production process of yellow phosphorus in recent years. The applicant discloses for the first time a main technical idea of a green yellow phosphorus production process in patent documents with publication numbers CN103523762B and CN103508429B, that is, a flue gas filtering and dedusting device is used for filtering and dedusting yellow phosphorus flue gas discharged from a phosphorus furnace (the flue gas filtering and dedusting device physically intercepts dust in the yellow phosphorus flue gas through a filter element), the temperature in the flue gas filtering and dedusting device can maintain the yellow phosphorus in the yellow phosphorus flue gas above a dew point temperature, so that the yellow phosphorus is in a gaseous state, the dust content of the yellow phosphorus flue gas can be reduced to below 10-20 mg per standard through filtering and dedusting, and then the yellow phosphorus flue gas is condensed, so that the generation of mud phosphorus and sewage is greatly reduced, and the problem of high pollution in yellow phosphorus production is expected to be fundamentally solved.

As the applicant goes deep into the yellow phosphorus manufacturers to popularize and implement the green yellow phosphorus production process, the applicant also continuously updates and iterates the related technologies according to the field conditions, and in the process, some new requirements or problems are often met.

For example, the applicant discloses a safety auxiliary device of a yellow phosphorus production system in a patent document with publication number CN205023857U, and adds a water seal pressure relief system which is arranged between a furnace gas inlet pipe of a phosphorus furnace and a washing tower (belonging to a yellow phosphorus condensation recovery device) in parallel with a filtering system, aiming at the problem that the internal pressure of the phosphorus furnace is suddenly increased and a blower or an induced draft fan of the filtering system cannot rapidly increase the frequency to absorb a large amount of yellow phosphorus smoke gas to cause the flame spraying phenomenon of the phosphorus furnace. However, the water seal pressure relief system is mainly used for preventing the fire spraying phenomenon caused by the pressure rise of the phosphorus furnace, namely, the water seal pressure relief system is mainly used for protecting the phosphorus furnace. When the pressure of the phosphorus furnace rises and the air pressure in the smoke filtering and dust removing device in the filtering system rises, the water seal pressure relief system does not respond to the pressure relief requirement of the smoke filtering and dust removing device in time. Therefore, the safety auxiliary device of the yellow phosphorus production system has poor effect on protecting the flue gas filtering and dust removing device.

For another example, the applicant discloses a yellow phosphorus flue gas purification system in patent document CN203513281U, and specifically provides the following scheme for solving the problem that yellow phosphorus flue gas discharged from a phosphorus furnace needs to be heated and kept warm before dust removal to prevent liquid yellow phosphorus from precipitating out: the phosphorus furnace is connected with the furnace gas dust collecting system through a smoke exhaust pipeline, the smoke exhaust pipeline is provided with a gas ascending section and a gas descending section which are connected with each other, an inlet of the gas ascending section is connected with the phosphorus furnace, an outlet of the gas descending section is connected with the furnace gas dust collecting system, an electric heater is installed at the tail pipe section of the gas ascending section, and the starting end of the gas descending section is connected to the side of the tail pipe section of the gas ascending section. When the device works, yellow phosphorus flue gas from a phosphorus furnace flows from bottom to top in a gas ascending section, reaches a tail pipe section, fully exchanges heat with an electric heater, then turns to enter the starting end of a gas descending section, and dust particles in the gas flow impact a pipe wall under inertia so as to be settled along with the gas flow. The smoke exhaust pipeline is mainly designed based on the purposes of improving the heat exchange efficiency and promoting the dust sedimentation. The inventor of this application discovers based on actual conditions that because the dust content in the yellow phosphorus flue gas is higher, can adhere to the dust gradually on electric heater's the heating pipe, at this moment, will influence heat exchange efficiency. In addition, the above patent intentionally installs the electric heater at the tail pipe section of the gas rising section so as to be sufficiently contacted with the gas flow, but since the heating temperature of the electric heater is high, the conversion of yellow phosphorus into red phosphorus is easily promoted, thereby reducing the yield of yellow phosphorus.

For example, the applicant discloses an ash discharging device and an ash discharging method in patent document CN111359335A, which is designed to solve the problem that yellow phosphorus vapor, which is a phase-change-prone substance and has a risk of explosion, is mixed in dust intercepted by a dust removing device to avoid, and the dust carrying the yellow phosphorus vapor is discharged directly, so that the dust carrying the yellow phosphorus vapor is dangerous. However, a plurality of valves are required to be installed in two-stage ash discharge, and the valves and other related equipment are required to be controlled in a linkage manner during ash discharge, so that the valves and the related equipment are high in requirement on working stability, and once part of equipment fails, ash discharge cannot be achieved. In a word, above-mentioned ash discharging device structure is comparatively complicated, when being applied to yellow phosphorus gas cleaning system, and job stabilization nature margin still can further improve.

For another example, the applicant discloses a method for regenerating a gas filter element in a patent document with publication number CN104645732A, which aims at the problem that the filter pores on the surface of the filter element in a flue gas filtering and dust removing device are blocked and the conventional blowback dust removal is difficult to effectively recover the filtering flux, and proposes that after the flue gas filtering and dust removing device is stopped, a mixed combustion-supporting gas containing 0.01-1.99% of oxygen by volume and the balance of nitrogen is introduced into the flue gas filtering and dust removing device, so that all the filter elements in the flue gas filtering and dust removing device are integrally placed in the flue gas filtering and dust removing device, the combustion-supporting gas and impurities such as dust, tar and/or yellow phosphorus deposited on the surface of the filter elements are subjected to an oxidation reaction of controllable combustion at a set temperature of 100-900 ℃, and the gas after the oxidation reaction is discharged through an exhaust structure. However, the regeneration method needs to trigger combustion and generate high temperature in the flue gas filtering and dust removing device, so the requirement for high temperature resistance of the flue gas filtering and dust removing device and the filter element thereof is higher, and the implementation cost is increased.

Disclosure of Invention

In view of at least one of the above technical problems, the following solutions are proposed.

In a first aspect, a yellow phosphorus flue gas purification system is provided, comprising: the smoke overpressure protection device is used for receiving yellow phosphorus smoke discharged by the phosphorus furnace, guiding the yellow phosphorus smoke to the diffusing tower or the yellow phosphorus condensation recovery device when the air pressure of the yellow phosphorus smoke reaches a set threshold value, and guiding the yellow phosphorus smoke to the smoke filtering and dust removing device when the air pressure of the yellow phosphorus smoke does not reach the set threshold value; the smoke filtering and dust removing device is used for receiving the yellow phosphorus smoke from the smoke overpressure protection device, physically intercepting dust in the yellow phosphorus smoke through the filter element under the condition that the yellow phosphorus in the yellow phosphorus smoke is in a gaseous state, and outputting the yellow phosphorus smoke after filtering, dust removing and purifying; the yellow phosphorus condensation recovery device is used for receiving the yellow phosphorus flue gas from the flue gas filtering and dust removing device, directly or indirectly condensing the yellow phosphorus flue gas through a cooling medium, converting the yellow phosphorus from a gaseous state into a liquid state, storing the liquid state in a yellow phosphorus tank, and outputting tail gas; the smoke overpressure protection device comprises a cylindrical container, an opening at one side of the cylindrical container is connected with the phosphorus furnace through a first vertical inclined pipe, an opening at the other side of the cylindrical container is connected with the smoke filtering and dust removing device through a second vertical inclined pipe, and an opening at the bottom of the cylindrical container is inserted below the liquid level of the water seal tank; the water seal tank is provided with a closed space and an open space which form a communicating vessel, the bottom opening of the cylindrical container is inserted below the liquid level of the closed space, and the upper space of the liquid level of the closed space in the water seal tank is connected with the diffusing tower or the yellow phosphorus condensation recovery device through a pipeline.

In a second aspect, an industrial kiln flue gas purification device is provided, which comprises: the smoke overpressure protection device is used for receiving smoke discharged by the industrial kiln and guiding the smoke to a diffusing tower or subsequent equipment of the smoke filtering and dust removing device when the air pressure of the smoke reaches a set threshold value, and guiding the smoke to the smoke filtering and dust removing device when the air pressure of the smoke does not reach the set threshold value; the smoke filtering and dust removing device is used for receiving smoke from the smoke overpressure protection device, physically intercepting dust in the smoke through the filter element, and outputting the smoke after filtering, dust removing and purifying; the flue gas overpressure protection device comprises a cylindrical container, an opening at one side of the cylindrical container is connected with the industrial kiln through a pipeline, an opening at the other side of the cylindrical container is connected with the flue gas filtering and dust removing device through a pipeline, and an opening at the bottom of the cylindrical container is inserted below the liquid level of the liquid seal tank; the liquid seal tank is provided with a closed space and an open space which form a communicating vessel, an opening at the bottom of the cylindrical container is inserted below the liquid level of the closed space, and the upper space of the liquid level of the closed space in the liquid seal tank is connected with the subsequent equipment of the diffusing tower or the smoke filtering and dust removing device through a pipeline.

The yellow phosphorus flue gas purification system of the first aspect and the industrial kiln flue gas purification device of the second aspect are both provided with similar flue gas overpressure protection devices before the flue gas filtering and dust removing device. The smoke overpressure protection device has the advantages that the smoke overpressure protection device is used for guiding the smoke to be filtered and dedusted to the subsequent equipment of the diffusing tower or the smoke filtering and dedusting device when the air pressure of the smoke to be filtered and dedusted reaches a set threshold value, and guiding the smoke to the smoke filtering and dedusting device when the air pressure of the smoke to be filtered and dedusted does not reach the set threshold value, so that when the air pressure of the industrial kiln suddenly rises, the smoke overpressure protection device can better protect the smoke filtering and dedusting device, and the damage of the equipment caused by the rising of the air pressure of the smoke filtering and dedusting device is effectively avoided. The cylindrical container in the flue gas overpressure protection device has a certain buffering effect, and is favorable for reducing the pressure fluctuation of the flue gas filtering and dust removing device. The liquid seal tank is provided with a closed space and an open space which form a communicating vessel, the bottom opening of the cylindrical container is inserted below the liquid level of the closed space, and the upper space of the liquid level of the closed space in the liquid seal tank is connected with the subsequent equipment of the diffusing tower or the smoke filtering and dust removing device through a pipeline, so that when the air pressure in the upper space rises in the pressure relief process of the smoke overpressure protection device, the liquid level of the closed space can be pushed to fall, the liquid level of the open space rises, the pressure in the upper space is prevented from being overlarge, and the corresponding pressure relief rate is increased.

In a third aspect, a yellow phosphorus flue gas purification system is provided, comprising: the smoke filtering and dust removing device is used for receiving yellow phosphorus smoke discharged from the phosphorus furnace, physically intercepting dust in the yellow phosphorus smoke through the filter element under the condition that the yellow phosphorus in the yellow phosphorus smoke is in a gaseous state, and outputting the yellow phosphorus smoke after filtering, dust removing and purifying; the flue gas flow driving device is used for receiving the yellow phosphorus flue gas output by the flue gas filtering and dedusting device, increasing the pressure of the yellow phosphorus flue gas through mechanical energy and then discharging the pressurized yellow phosphorus flue gas; the yellow phosphorus condensation recovery device is used for receiving yellow phosphorus flue gas from the flue gas flow driving device, directly or indirectly condensing the yellow phosphorus flue gas through a cooling medium, converting the yellow phosphorus from a gas state into a liquid state, storing the liquid state in a yellow phosphorus tank, and outputting tail gas; the smoke overpressure protection device is used for receiving yellow phosphorus smoke output by the smoke filtering and dust removing device, guiding the yellow phosphorus smoke to a diffusing tower or a yellow phosphorus condensation and recovery device by bypassing the smoke airflow driving device through a bypass when the air pressure of the yellow phosphorus smoke reaches a set threshold value, and cutting off the bypass when the air pressure of the yellow phosphorus smoke does not reach the set threshold value; the smoke overpressure protection device comprises a drainage tube, one end of the drainage tube is connected with the smoke filtering and dust removing device, the other end of the drainage tube is inserted below the liquid level of the water seal tank, and the upper space of the liquid level in the water seal tank is connected with the diffusing tower or the yellow phosphorus condensation and recovery device through a pipeline.

In a fourth aspect, a flue gas purification device for an industrial kiln is provided, which comprises: the flue gas filtering and dedusting device is used for receiving flue gas discharged from the industrial kiln, physically intercepting dust in the flue gas through a filter element, and outputting the flue gas after filtering, dedusting and purifying; the flue gas flow driving device is used for receiving the flue gas output by the flue gas filtering and dedusting device, increasing the pressure of the yellow phosphorus flue gas through mechanical energy and then discharging the pressurized yellow phosphorus flue gas; the smoke overpressure protection device is used for receiving smoke from the smoke filtering and dust removing device, guiding the smoke to subsequent equipment of a diffusing tower or a smoke airflow driving device by bypassing the smoke airflow driving device through a bypass when the air pressure of the smoke reaches a set threshold value, and cutting off the bypass when the air pressure of the smoke does not reach the set threshold value; the smoke overpressure protection device comprises a drainage tube, one end of the drainage tube is connected with the smoke filtering and dust removing device, the other end of the drainage tube is inserted below the liquid level of the liquid seal tank, and the upper space of the liquid level in the liquid seal tank is connected with the subsequent equipment of the diffusing tower or the smoke airflow driving device through a pipeline.

In the yellow phosphorus flue gas purification system of the third aspect and the industrial kiln flue gas purification device of the fourth aspect, the flue gas overpressure protection device and the flue gas airflow driving device are connected in parallel behind the flue gas filtering and dust removing device, and when the pressure of the industrial kiln is suddenly increased, the flue gas overpressure protection device can lead the flue gas to the subsequent equipment of the diffusing tower or the flue gas airflow driving device by bypassing the flue gas airflow driving device, so that the problem that the pressure of the flue gas filtering and dust removing device cannot be quickly released due to the fact that the frequency of the flue gas airflow driving device cannot be quickly increased is solved. Meanwhile, the smoke overpressure protection device is arranged behind the smoke filtering and dust removing device, so that the dust content of the airflow released by the smoke overpressure protection device is very low, and the air pollution or the influence on subsequent equipment of the smoke airflow driving device is reduced.

In a fifth aspect, there is provided a flue gas purification device for industrial kilns, comprising: the flue gas pretreatment device is used for receiving flue gas discharged from an industrial kiln, pretreating the flue gas and outputting the pretreated flue gas; the smoke filtering and dedusting device is used for receiving smoke from the smoke pretreatment device, physically intercepting dust in the smoke through the filter element and outputting the smoke after filtering, dedusting and purifying; the flue gas pretreatment device comprises an airflow buffer, wherein the airflow buffer is provided with an air inlet section, a diameter-variable contraction section, a diameter-variable expansion section and an exhaust section which are sequentially arranged according to the flow direction of flue gas, the air inlet section is used for receiving the flue gas discharged from the industrial kiln, and the exhaust section is used for outputting the pretreated flue gas; in addition, the flue gas pretreatment device also comprises a heat exchanger which is arranged in the exhaust section and is opposite to the outlet of the reducing and expanding section.

In a sixth aspect, a flue gas pretreatment device is provided, which is used for receiving flue gas discharged from an industrial kiln, pretreating the flue gas, and outputting the pretreated flue gas to a flue gas filtering and dust removing device; the device comprises an airflow buffer, wherein the airflow buffer is provided with an air inlet section, a diameter-variable contraction section, a diameter-variable expansion section and an exhaust section which are sequentially arranged according to the flow direction of flue gas, the air inlet section is used for receiving the flue gas discharged from the industrial kiln, and the exhaust section is used for outputting the pretreated flue gas; in addition, the flue gas pretreatment device also comprises a heat exchanger which is arranged in the exhaust section and is opposite to the outlet of the reducing and expanding section.

According to the industrial kiln gas purification device in the fifth aspect and the gas pretreatment device in the sixth aspect, the adopted airflow buffer is provided with the gas inlet section, the diameter-variable contraction section, the diameter-variable expansion section and the gas exhaust section which are sequentially arranged according to the flow direction of the gas, and the flow velocity of the gas flow is increased by utilizing the Venturi effect when the gas flow passes through the diameter-variable contraction section and the diameter-variable expansion section, so that the problem that the heat exchange efficiency is reduced due to the fact that pollutants such as dust are attached to a heat exchanger (an electric heater) can be solved. In addition, since the flow velocity of the air flow is increased, the time for the air flow to pass through the heat exchanger (electric heater) is shortened, and the conversion of yellow phosphorus into red phosphorus and the like can be prevented.

In a seventh aspect, a yellow phosphorus flue gas purification system is provided, comprising: the smoke filtering and dust removing device is used for receiving yellow phosphorus smoke discharged by the phosphorus furnace, physically intercepting dust in the yellow phosphorus smoke through the filter element under the condition that the yellow phosphorus in the yellow phosphorus smoke is in a gaseous state, and then outputting the yellow phosphorus smoke after filtering, dust removing and purifying; the yellow phosphorus condensation recovery device is used for receiving the yellow phosphorus flue gas from the flue gas filtering and dust removing device, directly or indirectly condensing the yellow phosphorus flue gas through a cooling medium, converting the yellow phosphorus from a gaseous state into a liquid state, storing the liquid state in a yellow phosphorus tank, and outputting tail gas; the device comprises a dust remover barrel, a filter element, a gas inlet, a gas outlet, a gas inlet pipe, a gas outlet pipe, a gas filter, a gas inlet pipe, a gas outlet pipe, a gas inlet pipe, a gas outlet pipe and a gas outlet pipe, wherein the filter element is arranged in the dust remover barrel through a filter element mounting plate and divides the dust remover barrel into a lower original gas chamber and an upper gas purifying chamber; in addition, the flue gas filtering and dust removing device further comprises a water seal tank, an opening at the bottom of the discharging channel is inserted below the liquid level of the water seal tank, and a discharging structure is arranged at the bottom of the water seal tank.

The eighth aspect provides a flue gas filtering and dust removing device, which comprises: the flue gas filtering and dedusting device is used for receiving flue gas discharged by the industrial kiln, physically intercepting dust in the flue gas through the filter element, and then outputting the flue gas after filtering, dedusting and purifying; the device comprises a dust remover barrel, a filter element, a gas inlet, a gas outlet, a gas inlet pipe, a gas outlet pipe, a gas filter, a gas inlet pipe, a gas outlet pipe, a gas inlet pipe, a gas outlet pipe and a gas outlet pipe, wherein the filter element is arranged in the dust remover barrel through a filter element mounting plate and divides the dust remover barrel into a lower original gas chamber and an upper gas purifying chamber; in addition, the flue gas filtering and dust removing device further comprises a liquid seal groove, the discharging channel is inserted below the liquid level of the liquid seal groove, and a discharging structure is arranged at the bottom of the liquid seal groove.

The yellow phosphorus flue gas purification system of the seventh aspect and the flue gas filtering and dust removing device of the eighth aspect are designed to insert the discharging channel into the liquid seal tank (the water seal tank in the case of yellow phosphorus flue gas dust) under the liquid level for discharging yellow phosphorus flue gas dust and other dust with similar properties, and compared with the two-stage ash discharge mode, the structure is greatly simplified. The dust discharged through the discharging channel can sink below the liquid level, so that the yellow phosphorus carried in the dust is prevented from contacting with air, and the dust and the condensed yellow phosphorus are discharged through the discharging structure.

In a ninth aspect, a yellow phosphorus flue gas purification system is provided, comprising: the smoke pretreatment device is used for receiving yellow phosphorus smoke discharged from the phosphorus furnace, pretreating the yellow phosphorus smoke and outputting the pretreated yellow phosphorus smoke; the smoke filtering and dedusting device is used for receiving the yellow phosphorus smoke from the smoke pretreatment device, physically intercepting dust in the yellow phosphorus smoke through the filter element under the condition that the yellow phosphorus in the yellow phosphorus smoke is in a gaseous state, and outputting the yellow phosphorus smoke after filtering, dedusting and purifying; the yellow phosphorus condensation recovery device is used for receiving the yellow phosphorus flue gas from the flue gas filtering and dust removing device, directly or indirectly condensing the yellow phosphorus flue gas through a cooling medium, converting the yellow phosphorus from a gaseous state into a liquid state, storing the liquid state in a yellow phosphorus tank, and outputting tail gas; the flue gas pretreatment device comprises an airflow buffer, the airflow buffer is provided with an airflow buffer cylinder, an airflow buffer space is formed in the airflow buffer cylinder, the airflow buffer space is provided with an air inlet for receiving yellow phosphorus flue gas discharged from a phosphorus furnace and an air outlet for outputting the pretreated yellow phosphorus flue gas, and the bottom of the airflow buffer cylinder is provided with a discharge channel communicated with the airflow buffer space; and the flue gas pretreatment device also comprises a water seal tank, an opening at the bottom of the discharge channel is inserted below the liquid level of the water seal tank, and a discharge structure is arranged at the bottom of the water seal tank.

A tenth aspect provides a flue gas pretreatment device, configured to receive flue gas discharged from an industrial kiln, pretreat the flue gas, and output the pretreated flue gas to a flue gas filtering and dust removing device; the device comprises an airflow buffer, wherein the airflow buffer is provided with an airflow buffer cylinder body, an airflow buffer space is formed in the airflow buffer cylinder body, an air inlet used for receiving flue gas discharged from an industrial kiln and an air outlet used for outputting pretreated flue gas are arranged on the airflow buffer space, and a discharge channel communicated with the airflow buffer space is arranged at the bottom of the airflow buffer cylinder body; and the flue gas pretreatment device also comprises a liquid seal groove, the discharge channel is inserted below the liquid level of the liquid seal groove, and the bottom of the liquid seal groove is provided with a discharge structure.

In a similar way, the yellow phosphorus flue gas purification system of the ninth aspect and the flue gas filtering and dust removing device of the tenth aspect are designed to insert the discharging channel into the liquid seal tank (the water seal tank during yellow phosphorus flue gas dust discharge) under the liquid level for discharging yellow phosphorus flue gas dust and other dust with similar properties, so that the structure is greatly simplified compared with the two-stage ash discharge mode. The dust discharged through the discharging channel can sink below the liquid level, so that the yellow phosphorus carried in the dust is prevented from contacting with air, and the dust and the condensed yellow phosphorus are discharged through the discharging structure.

In an eleventh aspect, there is provided a flue gas filtering and dust removing device, comprising: the dust remover cylinder is used for providing a shell of the flue gas filtering and dust removing device; the filter element is arranged in the dust remover cylinder to form a raw air chamber and a purified air chamber; the air inlet structure is arranged on the dust remover barrel and is communicated with the original air chamber; the exhaust structure is arranged on the dust remover cylinder and is communicated with the air purifying chamber; the ash discharging structure is arranged at the bottom of the dust remover cylinder and is communicated with the lower part of the original air chamber; the filter element regeneration liquid cleaning structure is used for providing regeneration liquid capable of cleaning pollutants on the filter element for the filter element; the regenerated liquid discharging structure is arranged at the bottom of the dust remover cylinder and is communicated with the lower part of the original gas chamber; the dust remover drying structure is used for drying the inside of the dust remover barrel.

In a twelfth aspect, a filter element regeneration method for a flue gas filtering and dust removing device is provided, which adopts the flue gas filtering and dust removing device of the eleventh aspect, and comprises: closing the air intake structure; providing the regeneration liquid to the filter element through the filter element regeneration liquid cleaning structure; discharging the regenerated liquid out of the deduster cylinder through the regenerated liquid discharge structure; and drying the inside of the dust remover barrel through the dust remover drying structure.

In the flue gas filtering and dust removing device of the eleventh aspect and the filter element regeneration method of the flue gas filtering and dust removing device of the twelfth aspect, the filter element of the flue gas filtering and dust removing device is cleaned by the regeneration liquid creatively, and then the interior of the dust remover barrel is dried by the dust remover drying structure, so that the regeneration liquid cannot remain in the dust remover barrel to influence filtering and dust removal. The regeneration mode is simpler and safer.

The present application will be further described with reference to the following drawings and detailed description. Additional aspects and advantages 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.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to assist in understanding the present application and are incorporated in and constitute a part of this specification, with the understanding that the present application is to be considered an exemplification of the principles of the invention and is not intended to be unduly limiting.

Fig. 1 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 7 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 9 is a schematic structural diagram of a water-sealed tank in a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 10 is a schematic structural diagram of a water-sealed tank in a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 11 is a schematic structural diagram of a water seal tank in a yellow phosphorus flue gas purification system according to an embodiment of the present application.

Fig. 12 is a construction diagram of a flue gas pretreatment device according to an embodiment of the present application.

Detailed Description

The present application will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the present application based on these teachings. Before describing the present application in connection with the accompanying drawings, it should be particularly noted that:

the technical solutions and features provided in the respective sections including the following description may be combined with each other without conflict. Furthermore, where possible, these technical solutions, technical features and related combinations may be given specific technical subject matter and are protected by the accompanying patent.

The embodiments of the application referred to in the following description are generally only some embodiments, but not all embodiments, on the basis of which all other embodiments, obtained by a person skilled in the art without making any inventive step, shall fall within the scope of patent protection.

With respect to the terms and units in this specification: the terms "comprising," "including," "having," and any variations thereof in this specification and in the claims and following claims are intended to cover non-exclusive inclusions. In addition, other related terms and units can be reasonably construed based on the description to provide related contents.

The applicant discloses for the first time a main technical idea of a green yellow phosphorus production process in patent documents with publication numbers CN103523762B and CN103508429B, that is, a flue gas filtering and dedusting device is used for filtering and dedusting yellow phosphorus flue gas discharged from a phosphorus furnace, the flue gas filtering and dedusting device physically intercepts dust in the yellow phosphorus flue gas through a filter element, in the process, the temperature in the flue gas filtering and dedusting device can maintain the yellow phosphorus in the yellow phosphorus flue gas above a dew point temperature, so that the yellow phosphorus is in a gaseous state, the dust content of the yellow phosphorus flue gas can be reduced to below 10-20 mg per standard (even to below 5-10 mg per standard) through filtering and dedusting, and then the yellow phosphorus flue gas is condensed, so that the generation of mud phosphorus and sewage is greatly reduced, and the problem of high pollution in yellow phosphorus production is expected to be fundamentally solved.

Because the temperature in the flue gas filtering and dust removing device can maintain the yellow phosphorus in the yellow phosphorus flue gas above the dew point temperature, the flue gas filtering and dust removing device can also be called as a high-temperature flue gas filtering and dust removing device. The core of the filter element is that the filter material used by the filter element can not only endure higher temperature (the recommended temperature range is given in CN103523762B and CN103508429B, which are not described herein in detail), but also ensure higher filtering efficiency and filtering flux, the filtering effect can be represented by the dust content of the yellow phosphorus flue gas after dust removal by filtering, and the filtering flux can be represented by the volume of gas filtered per unit filtering area in unit time.

When the filter element is used, dust can be attached to the filtering surface of the filter element, so that the filtering flux can be gradually reduced. The conventional mode is to perform back-blowing ash removal on the filter elements, the back-blowing ash removal is the traditional technology of the flue gas filter, and usually, a blowing pipe can be adopted to aim at the air outlet of each filter element for back-blowing. Except for carrying out back flushing dust removal on the filter element, when the filter element is seriously polluted and the filtering flux can not be effectively recovered through back flushing dust removal, the filter element can be regenerated. The specific regeneration method will be described later.

Due to the arrangement of the flue gas filtering and dust removing device, a series of specific problems such as how to reduce the influence of the flue gas filtering and dust removing device on the yellow phosphorus production process, how to realize ash discharge of the flue gas filtering and dust removing device, how to control the temperature of yellow phosphorus flue gas to enter the flue gas filtering and dust removing device, how to regenerate a filter element of the flue gas filtering and dust removing device and the like are brought correspondingly, and a related technology is formed aiming at the specific problems.

As the applicant goes deep into yellow phosphorus manufacturers to popularize and implement the green yellow phosphorus production process, the applicant also continuously updates and iterates the related technologies according to the field conditions, and therefore, the applicant successively submits patent applications with publication numbers/publication numbers of CN205023857U, CN203513281U, CN111359335A, CN104645732A, and the like.

CN205023857U discloses a safety auxiliary device of a yellow phosphorus production system, which is additionally provided with a water seal pressure relief system which is arranged between a furnace gas inlet pipe of a phosphorus furnace and a washing tower (belonging to a yellow phosphorus condensation recovery device) in parallel with a filtering system, aiming at the problem that the internal pressure of the phosphorus furnace is suddenly increased and an air blower or an induced draft fan of the filtering system cannot rapidly increase the frequency to absorb a large amount of yellow phosphorus smoke gas to cause the flame-throwing phenomenon of the phosphorus furnace.

However, the water seal pressure relief system is mainly arranged for preventing the fire spraying phenomenon caused by the pressure rise of the phosphorus furnace, namely, the water seal pressure relief system is mainly arranged for protecting the phosphorus furnace. When the pressure of the phosphorus furnace rises and the air pressure in the smoke filtering and dust removing device in the filtering system rises, the water seal pressure relief system does not respond to the pressure relief requirement of the smoke filtering and dust removing device in time. Therefore, the safety auxiliary device of the yellow phosphorus production system has poor effect on protecting the smoke filtering and dust removing device.

CN203513281U discloses a yellow phosphorus flue gas purification system, and the following scheme is provided for solving the problem that yellow phosphorus flue gas discharged from a phosphorus furnace needs to be heated and kept warm before dust removal so as to prevent liquid yellow phosphorus from being separated out: the phosphorus furnace is connected with the furnace gas dust collecting system through a smoke exhaust pipeline, the smoke exhaust pipeline is provided with a gas ascending section and a gas descending section which are connected with each other, an inlet of the gas ascending section is connected with the phosphorus furnace, an outlet of the gas descending section is connected with the furnace gas dust collecting system, an electric heater is installed at the tail pipe section of the gas ascending section, and the starting end of the gas descending section is connected to the side of the tail pipe section of the gas ascending section. When the device works, yellow phosphorus flue gas from a phosphorus furnace flows from bottom to top in a gas ascending section, reaches a tail pipe section, fully exchanges heat with an electric heater, then turns to enter the starting end of a gas descending section, and dust particles in the gas flow impact a pipe wall under inertia so as to be settled along with the gas flow.

The smoke exhaust pipeline is mainly designed based on the purposes of improving the heat exchange efficiency and promoting the dust sedimentation. The inventor of this application discovers based on actual conditions that because the dust content in the yellow phosphorus flue gas is higher, can adhere to the dust on electric heater's the heating pipe gradually, at this moment, will influence heat exchange efficiency. In addition, the above patent intentionally installs the electric heater at the tail pipe section of the gas rising section so as to be sufficiently contacted with the gas flow, but since the heating temperature of the electric heater is high, the conversion of yellow phosphorus into red phosphorus is easily promoted, thereby reducing the yield of yellow phosphorus.

CN111359335A discloses an ash discharging device and an ash discharging method, which are designed to solve the problem that yellow phosphorus vapor, which is a substance liable to phase change and has a risk of explosion, is mixed into dust intercepted by a dust removing device to avoid the problem that the dust carrying the yellow phosphorus vapor is discharged directly and has high risk, that is, the dust is discharged into an intermediate tank, then a replacement gas is introduced into the intermediate tank, so as to replace the yellow phosphorus vapor in the dust, and then the dust in the intermediate tank is discharged.

However, a plurality of valves are required to be installed in two-stage ash discharge, and the valves and other related equipment are required to be controlled in a linkage manner during ash discharge, so that the requirements on the working stability of the valves and the related equipment are high, and once part of equipment fails, ash discharge cannot be realized. In a word, the ash discharge device has a complex structure, and when the ash discharge device is applied to a yellow phosphorus flue gas purification system, the working stability margin can be further improved.

CN104645732A discloses a method for regenerating a gas filter element, which aims at the problem that the filtration pores on the surface of the filter element in a flue gas filtration and dust removal device are blocked and the conventional back-flushing dust removal is difficult to effectively recover the filtration flux, and provides that after the flue gas filtration and dust removal device is stopped, mixed combustion-supporting gas containing 0.01-1.99% of oxygen by volume and the balance of nitrogen is introduced into the flue gas filtration and dust removal device, all the filter elements in the flue gas filtration and dust removal device are integrally placed in the flue gas filtration and dust removal device, the combustion-supporting gas and impurities such as dust, tar and/or yellow phosphorus deposited on the surface of the filter element are subjected to controllable oxidation reaction of combustion at a set temperature of 100-900 ℃, and the gas after the oxidation reaction is discharged through an exhaust structure.

However, the above regeneration method needs to trigger combustion and generate high temperature in the flue gas filtering and dust removing device, and the requirement for high temperature resistance of the flue gas filtering and dust removing device and the filter element thereof is higher, thereby increasing the implementation cost.

The following describes embodiments related to the present application, which can solve at least one of the above technical problems when implemented individually, and can solve two or more of the above technical problems when implemented in combination.

Fig. 1 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. As shown in fig. 1, the yellow phosphorus flue gas purification system comprises: the system comprises a flue gas overpressure protection device 200, a flue gas pretreatment device 300, a flue gas filtering and dedusting device 400, a flue gas flow driving device 500 and a yellow phosphorus condensation and recovery device 600.

The smoke overpressure protection device 200 is used for receiving yellow phosphorus smoke discharged by the phosphorus furnace 100, guiding the yellow phosphorus smoke to a diffusing tower (not shown in the figure) or a yellow phosphorus condensation recovery device 600 when the air pressure of the yellow phosphorus smoke reaches a set threshold value, and guiding the yellow phosphorus smoke to the smoke pretreatment device 300 when the air pressure of the yellow phosphorus smoke does not reach the set threshold value.

The flue gas pretreatment device 300 is arranged between the flue gas overpressure protection device 200 and the flue gas filtering and dust removing device 400, and is used for receiving the yellow phosphorus flue gas from the flue gas overpressure protection device 200, pretreating the yellow phosphorus flue gas, and outputting the pretreated yellow phosphorus flue gas.

The flue gas filtering and dust removing device 400 is used for receiving the yellow phosphorus flue gas from the flue gas pretreatment device 300, physically intercepting dust in the yellow phosphorus flue gas through the filter element 410 under the condition that the yellow phosphorus in the yellow phosphorus flue gas is in a gaseous state, and then outputting the yellow phosphorus flue gas after being filtered, dedusted and purified.

The flue gas flow driving device 500 (generally adopting a fan) is used for receiving the yellow phosphorus flue gas output from the flue gas filtering and dust removing device 400, increasing the pressure of the yellow phosphorus flue gas through mechanical energy, and then discharging the pressurized yellow phosphorus flue gas.

The yellow phosphorus condensation recovery device 600 is used for receiving yellow phosphorus flue gas from the flue gas flow driving device 500, directly or indirectly condensing the yellow phosphorus flue gas through a cooling medium, so that the yellow phosphorus is converted from a gaseous state to a liquid state and then stored in the yellow phosphorus tank 610, and meanwhile, tail gas is output.

The smoke overpressure protection device 200 comprises a cylindrical container 210, wherein an opening at one side of the cylindrical container 210 is connected with the phosphorus furnace 100 through a first vertical inclined pipe 220, an opening at the other side of the cylindrical container is connected with the smoke pretreatment device 300 through a second vertical inclined pipe 230, and an opening at the bottom of the cylindrical container is inserted below the liquid level of a water seal tank 240.

As shown in fig. 9 to 10, the water sealed tank 240 has a closed space 241 and an open space 242 constituting a communicating vessel, the bottom opening of the cylindrical container 210 is inserted below the liquid level of the closed space 241 (the depth below the liquid level is adapted to the above-mentioned set threshold), and the upper space of the liquid level of the closed space 241 in the water sealed tank 240 is connected to the diffusion tower or the yellow phosphorus condensation recovery apparatus 600 through a pipe 250.

The flue gas pretreatment device 300 comprises an airflow buffer, the airflow buffer is provided with an airflow buffer cylinder 310, an airflow buffer space is formed in the airflow buffer cylinder 310, and an air inlet for receiving the yellow phosphorus flue gas from the flue gas overpressure protection device 200 and an air outlet for outputting the pretreated yellow phosphorus flue gas are arranged on the airflow buffer space.

The yellow phosphorus flue gas purification system is provided with a flue gas overpressure protection device 200 in front of the flue gas filtering and dedusting device 400. Because the flue gas overpressure protection device 200 is used for guiding the yellow phosphorus flue gas discharged by the phosphorus furnace 100 to the diffusing tower or the yellow phosphorus condensation recovery device 600 when the air pressure of the yellow phosphorus flue gas reaches a set threshold value, and guiding the yellow phosphorus flue gas to the flue gas filtering and dust removing device 400 after passing through the flue gas pretreatment device 300 when the air pressure of the yellow phosphorus flue gas does not reach the set threshold value, when the air pressure of the phosphorus furnace 100 suddenly rises, the flue gas filtering and dust removing device 400 can be better protected through the flue gas overpressure protection device 200, and the damage of equipment, especially a filter element, caused by the sudden rise of the air pressure of the flue gas filtering and dust removing device 400 is effectively avoided.

The filter element used by the applicant before the filing date of CN103523762B, CN103508429B may be referred to as a "rigid filter element", which has high strength and high temperature resistance, but also high manufacturing cost. Later, the applicant developed a flexible membrane cartridge that was made using a flexible metal membrane in a cloth bag-like configuration, which not only withstands high temperatures, but also has a significantly reduced manufacturing cost, and which is not as strong as a rigid cartridge. With the above-described smoke overpressure protection device 200, it is clearly more desirable to use a less costly flexible membrane cartridge.

The cylindrical container 210 in the smoke overpressure protection device 200 has a certain buffering effect, which helps to reduce the pressure fluctuation of the smoke filtering and dust removing device 400.

Since the water sealed tank 240 has the closed space 241 and the open space 242 which form a communicating vessel, the bottom opening of the cylindrical container 210 is inserted below the liquid level of the closed space 241, and the upper space of the liquid level of the closed space in the water sealed tank 240 is connected with the emission tower or the yellow phosphorus condensation recovery device 600 through the pipeline 250, when the air pressure in the upper space is increased during the pressure relief process of the smoke overpressure protection device 200, the liquid level of the closed space 241 can be pushed to be lowered, and the liquid level of the open space 242 is raised (see fig. 10), so that the pressure in the upper space is prevented from being too high, and the corresponding pressure relief rate is increased.

Therefore, the structure of the smoke overpressure protection device 200 also helps to minimize the influence on the smoke filtering and dust removing device 400 when the pressure of the phosphorus furnace 100 suddenly rises.

As shown in fig. 9 to 10, the water seal tank 240 has a lower tank body and an upper tank body, the upper tank body is installed in the lower tank body in an inverted manner through a connecting member connected between the lower tank body and the upper tank body, a bottom passage and a side passage are reserved between the upper tank body and the lower tank body, so that the closed space is formed inside the upper tank body and between the bottom passage, and the side passage forms the open space 242. In addition, an overflow port communicating with the upper part of the open space 242 is provided on the water seal tank 240, and when the liquid level in the open space 242 rises to the overflow port, overflow is realized.

At least one function of the flue gas pretreatment device 300 is to further reduce the influence of the air pressure fluctuation of the phosphorus furnace 100 on the flue gas filtering and dust removing device 400 through the buffering effect of the airflow buffer, and to protect the phosphorus furnace 100 from reducing the operation safety hazard thereof. The phosphorus furnace 100 may sometimes generate negative pressure (the phosphorus furnace 100 is specifically an electric furnace) due to sudden collapse of charging materials during operation, and the negative pressure may cause air to be sucked into the phosphorus furnace 100 to contact with yellow phosphorus to cause explosion, so that the airflow buffer can actually perform negative pressure protection on the phosphorus furnace 100, thereby cooperating with the smoke overpressure protection device 200.

The flue gas pretreatment device 300 also typically has a function of mechanically pre-dedusting the yellow phosphorus flue gas. For example, the large particle dust in the yellow phosphorus flue gas is removed by using natural principles such as gravity settling and inertial separation. Thus, the flue gas pretreatment device 300 may also be referred to as a mechanical precipitator if viewed from the perspective of mechanical pre-dust removal.

The flue gas pretreatment device 300 can utilize a variety of different structures to achieve mechanical pre-dedusting. A simple implementation is to use the air buffer cylinder 310 directly to achieve gravity settling of the dust. In other embodiments, the mechanical pre-dust removal can be realized by using the related structure of a gravity dust remover, an inertial dust remover, a cyclone dust remover and other mechanical dust removers. The bottom of the flue gas pretreatment device 300 is also provided with a discharge channel 330 for discharging the dust.

The flue gas pretreatment device 300 can also be provided with a heat exchanger for heating yellow phosphorus flue gas, so that the phenomenon that liquid yellow phosphorus is separated out due to cooling before the yellow phosphorus flue gas passes through the flue gas filtering and dust removing device 400 is avoided, and further the flue gas filtering and dust removing device 400 is internally led to be blocked due to the fact that yellow phosphorus and dust are attached to the inner wall of a related pipeline. In an alternative embodiment, the heat exchanger is embodied as an electric heater 320.

Generally, the flue gas filtering and dust removing device 400 comprises a dust remover cylinder 420, the filter element 410 is installed 430 in the dust remover cylinder 420 through a filter element installation plate and divides the dust remover cylinder into a lower original gas chamber 440 and an upper gas purification chamber 450, the original gas chamber 440 is provided with a gas inlet for receiving the yellow phosphorus flue gas to be filtered, dedusted and purified, the gas purification chamber 450 is provided with a gas outlet for outputting the yellow phosphorus flue gas after filtering, dedusting and purifying, and the bottom of the dust remover cylinder 420 is provided with a discharge channel 460 communicated with the original gas chamber 440.

In addition, in general, the flue gas filtering and dust removing device 400 further comprises a filter element blowback ash removal structure 470 for applying the compressed gas from the air purifying chamber 450 to the filter element 410 in the direction opposite to the filtering direction. Here, the compressed gas is typically nitrogen.

In a general embodiment, the filter element back-blowing ash-cleaning structure 470 comprises a compressed gas delivery pipe 471, a part of the compressed gas delivery pipe 471 is located in the air-purifying chamber 450 in the dust remover cylinder 420, and a blowing opening corresponding to the output opening of the filter element 410 is distributed; another portion of the compressed gas delivery tube 471 is located outside the duster cylinder 420 and is connected to a compressed gas source through a first control valve 472. The compressed air source may be an air bag 473.

In other embodiments, the filter element back-blowing ash-removing structure 470 can also adopt a back-blowing technique such as venturi tube back-blowing.

In a general embodiment, the yellow phosphorus condensation and recovery device 600 employs more than 2 spray towers 620 which can be connected in parallel or in series, and these spray towers 620 directly spray cooling water with a certain temperature to the yellow phosphorus flue gas, so that the yellow phosphorus is changed from a gaseous state to a liquid state and then stored in the yellow phosphorus tank 610, and meanwhile, tail gas is output.

In a preferred embodiment, the yellow phosphorus condensation and recovery device 600 comprises M spray towers which are connected in series, wherein M is an integer more than or equal to 2; and the flue gas overpressure protection device 200 guides the yellow phosphorus flue gas to the nth spray tower in the yellow phosphorus condensation recovery device 600 according to the flowing direction of the yellow phosphorus flue gas flow when the pressure of the yellow phosphorus flue gas reaches a set threshold, wherein N is an integer not less than 2 and not more than M.

In the preferred embodiment, since M spray towers are connected in series, the overall yield of yellow phosphorus in these spray towers is high, and the content of yellow phosphorus in the tail gas is low. In addition, the flue gas overpressure protection device 200 guides the yellow phosphorus flue gas to the nth spray tower in the yellow phosphorus condensation recovery device 600 according to the flowing direction of the yellow phosphorus flue gas flow when the pressure of the yellow phosphorus flue gas reaches a set threshold, wherein N is an integer not less than 2 and not more than M, so that the influence of large back pressure generated in the 1 st spray tower on the normal operation of the flue gas filtering and dust removing device 400 can be avoided, and the yellow phosphorus condensation recovery device 600 can release pressure more quickly.

In other embodiments, the yellow phosphorus condensation and recovery device 600 can indirectly condense and recover yellow phosphorus by using a special phosphorus collecting device such as that provided in the patent document with the application publication number CN103708432B of the applicant.

Because solid slag, yellow phosphorus and other impurities are gradually generated in the water seal tank 240 of the flue gas overpressure protection device 200 and are gathered at the bottom of the water seal tank 240, a discharge structure can be arranged at the bottom of the water seal tank 240 so as to discharge the solid slag, yellow phosphorus and other impurities from the bottom of the water seal tank 240.

In one embodiment, the bottom of the water-sealed tank 240 is provided with a slope, and the lowest part is provided with a discharge opening, and the discharge opening is connected to the intermediate tank 260 through a pipeline, so that impurities can be discharged into the intermediate tank 260 through the discharge opening. The intermediate tank is filled with hot water to keep the yellow phosphorus in a liquid state so as to convey the yellow phosphorus to the yellow phosphorus refining process.

The flue gas pretreatment device 300 and the flue gas filtering and dust removing device 400 both adopt an ash discharge device and an ash discharge method similar to those in CN111359335A, that is, the discharge channel 330 of the flue gas pretreatment device 300 and the discharge channel 460 of the flue gas filtering and dust removing device 400 are respectively connected with the intermediate ash tank 481 through discharge valves, and the intermediate ash tank 481 is connected with the storage tank 482 through the discharge valves. After the dust is discharged into the intermediate dust tank 481, a replacement gas (e.g., nitrogen) is introduced into the intermediate dust tank 481 to replace the yellow phosphorus vapor in the dust, and then the dust in the intermediate dust tank 481 is discharged into the storage tank 482.

The tail gas output by the yellow phosphorus condensation and recovery device 600 contains a large amount of carbon monoxide, and is generally conveyed to a gas tank for storage so as to be conveniently utilized subsequently. Another flue gas flow driving device (such as a water ring vacuum pump) can be arranged between the yellow phosphorus condensation and recovery device 600 and the gas tank to suck the tail gas. In the case where the flue gas flow driving device is provided after the yellow phosphorus condensation and recovery device 600, the flue gas flow driving device 500 may be eliminated.

Fig. 2 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. As shown in fig. 2, the yellow phosphorus flue gas purification system comprises: the system comprises a flue gas overpressure protection device 200, a flue gas pretreatment device 300, a flue gas filtering and dedusting device 400, a flue gas flow driving device 500 and a yellow phosphorus condensation and recovery device 600.

The flue gas pretreatment device 300 is arranged between the flue gas overpressure protection device 200 and the phosphorus furnace 100, and is used for receiving the yellow phosphorus flue gas discharged by the phosphorus furnace 100, pretreating the yellow phosphorus flue gas, and outputting the pretreated yellow phosphorus flue gas.

The smoke overpressure protection device 200 is used for receiving the yellow phosphorus smoke from the smoke pretreatment device 300, guiding the yellow phosphorus smoke to the diffusing tower or the yellow phosphorus condensation recovery device 600 when the air pressure of the yellow phosphorus smoke reaches a set threshold value, and guiding the yellow phosphorus smoke to the smoke filtering and dust removing device 400 when the air pressure of the yellow phosphorus smoke does not reach the set threshold value.

The flue gas filtering and dust removing device 400 is used for receiving yellow phosphorus flue gas from the flue gas pretreatment device 300 and passing through the flue gas overpressure protection device 200, physically intercepting dust in the yellow phosphorus flue gas through the filter element 410 under the condition that the yellow phosphorus in the yellow phosphorus flue gas is in a gaseous state, and then outputting the yellow phosphorus flue gas after being filtered, dedusted and purified.

The flue gas flow driving device 500 is used for receiving the yellow phosphorus flue gas output by the flue gas filtering and dust removing device 400, and discharging the pressurized yellow phosphorus flue gas after the pressure of the yellow phosphorus flue gas is increased by mechanical energy.

The yellow phosphorus condensation and recovery device 600 is used for receiving the yellow phosphorus flue gas from the flue gas flow driving device 500, directly or indirectly condensing the yellow phosphorus flue gas through a cooling medium, so that the yellow phosphorus is converted from a gaseous state to a liquid state and then stored in the yellow phosphorus tank 610, and meanwhile, tail gas is output.

The flue gas overpressure protection device 200 comprises a cylindrical container 210, wherein an opening at one side of the cylindrical container 210 is connected with the flue gas pretreatment device 300 through a first vertical inclined pipe 220, an opening at the other side of the cylindrical container is connected with the flue gas filtering and dust removing device 400 through a second vertical inclined pipe 230, and an opening at the bottom of the cylindrical container is inserted below the liquid level of a water seal tank 240.

The water sealed tank 240 has a closed space 241 and an open space 242 constituting a communicating vessel, the bottom opening of the cylindrical container 210 is inserted below the liquid level of the closed space 241 (the depth below the liquid level is adapted to the above-mentioned set threshold), and the upper space of the liquid level of the closed space 241 in the water sealed tank 240 is connected to the diffusion tower or the yellow phosphorus condensation recovery apparatus 600 through a pipe 250.

The flue gas pretreatment device 300 comprises an airflow buffer, the airflow buffer is provided with an airflow buffer cylinder 310, an airflow buffer space is formed in the airflow buffer cylinder 310, and the airflow buffer space is provided with an air inlet for receiving the yellow phosphorus flue gas from the phosphorus furnace 100 and an air outlet for outputting the pretreated yellow phosphorus flue gas.

The yellow phosphorus flue gas cleaning system shown in fig. 2 differs from the yellow phosphorus flue gas cleaning system shown in fig. 1 in that: the relative positions of the flue gas pretreatment device 300 and the flue gas overpressure protection device 200 are interchanged. Since the flue gas pretreatment device 300 can usually perform mechanical pre-dedusting on the yellow phosphorus flue gas, the yellow phosphorus flue gas purification system shown in fig. 2 helps to reduce the generation amount of solid slag in the water seal tank 240.

Fig. 3 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. As shown in fig. 3, the yellow phosphorus flue gas purification system comprises: the system comprises a flue gas overpressure protection device 200, a flue gas pretreatment device 300, a flue gas filtering and dedusting device 400, a flue gas flow driving device 500 and a yellow phosphorus condensation and recovery device 600.

The flue gas pretreatment device 300 is arranged between the flue gas filtering and dust removing device 400 and the phosphorus furnace 100, and is used for receiving the yellow phosphorus flue gas discharged by the phosphorus furnace 100, pretreating the yellow phosphorus flue gas, and then outputting the pretreated yellow phosphorus flue gas.

The flue gas filtering and dedusting device 400 is used for receiving the yellow phosphorus flue gas from the flue gas pretreatment device 300, physically intercepting dust in the yellow phosphorus flue gas through the filter element 410 under the condition that the yellow phosphorus in the yellow phosphorus flue gas is still in a gaseous state, and then outputting the yellow phosphorus flue gas after filtering, dedusting and purifying.

The smoke overpressure protection device 200 is used for receiving yellow phosphorus smoke output by the smoke filtering and dust removing device 400, guiding the yellow phosphorus smoke to a diffusing tower or a yellow phosphorus condensation and recovery device 600 by bypassing the smoke airflow driving device 500 through a bypass when the air pressure of the yellow phosphorus smoke reaches a set threshold value, and cutting off the bypass when the air pressure of the yellow phosphorus smoke does not reach the set threshold value.

The flue gas overpressure protection device 200 comprises a drainage tube 260, one end of the drainage tube 260 is connected to the flue gas filtering and dust removing device 400, the other end of the drainage tube 260 is inserted below the liquid level of the water-sealed tank 240 (the depth below the inserted liquid level is adapted to the set threshold), and the upper space of the liquid level in the water-sealed tank 240 is connected to the diffusing tower or the yellow phosphorus condensation and recovery device 600 through a pipeline 250.

Preferably, the water sealed tank 240 has a closed space 241 and an open space 242 constituting a communicating vessel, the bottom opening of the cylindrical container 210 is inserted below the liquid level of the closed space 241 (the depth below the liquid level is adapted to the above-mentioned set threshold), and the upper space of the liquid level of the closed space 241 in the water sealed tank 240 is connected to the diffusing tower or the yellow phosphorus condensation recovery device 600 through a pipe 250.

The main differences between the yellow phosphorus flue gas cleaning system shown in fig. 3 and the yellow phosphorus flue gas cleaning system shown in fig. 1-2 are that: the flue gas overpressure protection device 200 and the flue gas flow driving device 500 are arranged between the flue gas filtering and dedusting device 400 and the yellow phosphorus condensation and recovery device 600 in parallel.

The advantages of the yellow phosphorus flue gas cleaning system shown in fig. 3 over the yellow phosphorus flue gas cleaning system shown in fig. 1-2 are: firstly, the yellow phosphorus flue gas passing through the water-sealed tank 240 is the yellow phosphorus flue gas filtered and dedusted by the flue gas filtering and dedusting device 400, so that the generation amount of solid slag in the water-sealed tank 240 is small, the purity of yellow phosphorus in the water-sealed tank 240 is higher, and the yellow phosphorus can be directly subjected to fine treatment. Secondly, the flue gas pretreatment device 300 and the flue gas filtering and dust removing device 400 are close to the phosphorus furnace 100, so that the liquid yellow phosphorus can be more effectively prevented from being separated out before the yellow phosphorus flue gas enters the flue gas filtering and dust removing device 400.

Fig. 4 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. As shown in fig. 4, the yellow phosphorus flue gas purification system includes: the system comprises a flue gas overpressure protection device 200, a flue gas pretreatment device 300, a flue gas filtering and dedusting device 400, a flue gas flow driving device 500 and a yellow phosphorus condensation and recovery device 600.

The water sealed tank 240 has a closed space 241 and an open space 242 constituting a communicating vessel, the bottom opening of the cylindrical container 210 is inserted below the liquid level of the closed space 241, and the upper space of the liquid level of the closed space 241 in the water sealed tank 240 is connected to the diffusing tower or the yellow phosphorus condensation recovery device 600 through a pipe 250.

In addition, the flue gas pretreatment device 300 comprises an airflow buffer and a water-sealed tank 340, the airflow buffer is provided with an airflow buffer cylinder 310, an airflow buffer space is formed in the airflow buffer cylinder 310, the airflow buffer space is provided with an air inlet for receiving the yellow phosphorus flue gas from the flue gas overpressure protection device 200 and an air outlet for outputting the pretreated yellow phosphorus flue gas, the bottom of the airflow buffer cylinder 310 is provided with a discharge channel communicated with the airflow buffer space, and the bottom opening of the discharge channel is inserted below the liquid level of the water-sealed tank 340. The water seal tank 340 is sealed by hot water with the temperature of 30-70 ℃, preferably 40-60 ℃, the bottom opening of the discharge channel is inserted into the depth below the liquid level of the water seal tank 340 to ensure that the water seal tank 340 can maintain a water seal state all the time, and the bottom of the water seal tank 340 is provided with a discharge structure 341.

In addition, the flue gas filtering and dust removing device 400 comprises a dust remover cylinder 420 and a water seal tank 470, the filter element 410 is installed in the dust remover cylinder 420 through a filter element installation plate 430 and divides the dust remover cylinder into a lower original gas chamber 440 and an upper gas purifying chamber 450, the original gas chamber 440 is provided with a gas inlet for receiving the yellow phosphorus flue gas to be filtered, dedusted and purified, the gas purifying chamber 450 is provided with a gas outlet for outputting the yellow phosphorus flue gas to be filtered, dedusted and purified, the bottom of the dust remover cylinder 420 is provided with a discharging channel 460 communicated with the original gas chamber 440, and the bottom opening of the discharging channel 460 is inserted below the liquid level of the water seal tank 470. The water seal tank 470 is sealed by hot water at 30-70 ℃, preferably 40-60 ℃, the bottom opening of the discharge channel is inserted into the water seal tank 470 to a depth below the liquid level to ensure that the water seal tank 470 can maintain a water seal state, and the bottom of the water seal tank 470 is provided with a discharge structure 471.

Compared with the yellow phosphorus flue gas purification system shown in fig. 1-3, the yellow phosphorus flue gas purification system shown in fig. 4 is designed with a structure that a discharging channel is inserted below the liquid level of a water seal tank aiming at discharging dust in a flue gas pretreatment device 300 and a flue gas filtering and dedusting device 400, and is greatly simplified compared with a two-stage ash discharging mode structure. The dust discharged through the discharging channel can sink below the liquid level of the corresponding water seal tank, so that the yellow phosphorus carried in the dust is prevented from contacting with air, and the dust and the condensed yellow phosphorus are discharged through the discharging structure.

On the basis of the yellow phosphorus flue gas purification system, the flue gas pretreatment device 300 and/or the flue gas filtering and dust removing device 400 comprise an opening and closing control mechanism for switching the corresponding discharge channel between an opening state and a closing state.

The opening and closing control mechanism can be an opening and closing control mechanism which automatically switches between an opening state and a closing state according to the pressure of the material to be discharged in the discharging channel on the opening and closing control mechanism; when the pressure of the material to be discharged in the discharging channel on the opening and closing control mechanism reaches a set condition, the opening and closing control mechanism is opened, and when the pressure does not reach the set condition, the opening and closing control mechanism is closed.

Optionally, the open-close control mechanism includes a turnover plate installed in the discharge channel through a damping mechanism, the turnover plate is turned over to open the discharge channel when the pressure of the material to be discharged on the turnover plate in the discharge channel exceeds the turning resistance applied to the turnover plate by the damping mechanism, and the turnover plate is turned off when the pressure of the material to be discharged on the turnover plate in the discharge channel does not exceed the turning resistance applied to the turnover plate by the damping mechanism.

Fig. 5 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. As shown in fig. 5, the yellow phosphorus flue gas purification system comprises: the system comprises a flue gas pretreatment device 300, a flue gas filtering and dedusting device 400, a flue gas flow driving device 500 and a yellow phosphorus condensation and recovery device 600.

The flue gas pretreatment device 300 is arranged between the phosphorus furnace 100 and the flue gas filtering and dust removing device 400, and is used for receiving the yellow phosphorus flue gas from the phosphorus furnace 100, pretreating the yellow phosphorus flue gas, and outputting the pretreated yellow phosphorus flue gas.

The flue gas flow driving device 500 is configured to receive the yellow phosphorus flue gas output from the flue gas filtering and dust removing device 400, and discharge the pressurized yellow phosphorus flue gas after increasing the pressure of the yellow phosphorus flue gas by mechanical energy.

The flue gas pretreatment device 300 comprises an airflow buffer and a water-sealed tank 340, the airflow buffer is provided with an airflow buffer cylinder 310, an airflow buffer space is formed in the airflow buffer cylinder 310, the airflow buffer space is provided with an air inlet for receiving the yellow phosphorus flue gas from the flue gas overpressure protection device 200 and an air outlet for outputting the pretreated yellow phosphorus flue gas, the bottom of the airflow buffer cylinder 310 is provided with a discharge channel communicated with the airflow buffer space, and an opening at the bottom of the discharge channel is inserted below the liquid level of the water-sealed tank 340. The water sealing tank 340 is sealed by hot water at the temperature of 30-70 ℃, preferably 40-60 ℃, and a discharge structure 341 is arranged at the bottom of the water sealing tank 340.

Further, as shown in fig. 11, the water sealed tank 340 has a closed space 241 and an open space 242 constituting a communicating vessel, the bottom opening of the discharge passage is inserted below the liquid level of the closed space 241, and the upper space of the liquid level of the closed space 241 in the water sealed tank 340 is connected to the diffusing tower or the yellow phosphorus condensation recovery apparatus 600 through a pipe 250.

The flue gas filtering and dust removing device 400 comprises a dust remover cylinder 420 and a water seal tank 470, wherein a filter element 410 is arranged in the dust remover cylinder 420 through a filter element mounting plate 430 and divides the dust remover cylinder into a lower original gas chamber 440 and an upper gas purifying chamber 450, the original gas chamber 440 is provided with a gas inlet for receiving yellow phosphorus flue gas to be filtered, dedusted and purified, the gas purifying chamber 450 is provided with a gas outlet for outputting the yellow phosphorus flue gas to be filtered, dedusted and purified, the bottom of the dust remover cylinder 420 is provided with a discharging channel 460 communicated with the original gas chamber 440, and the bottom opening of the discharging channel 460 is inserted below the liquid level of the water seal tank 470. The water seal tank 470 is sealed by hot water at 30-70 ℃, preferably 40-60 ℃, the bottom opening of the discharge channel is inserted into the water seal tank 470 to a depth below the liquid level to ensure that the water seal tank 470 can maintain a water seal state, and the bottom of the water seal tank 470 is provided with a discharge structure 471.

Compared with the yellow phosphorus flue gas purification system shown in fig. 4, the yellow phosphorus flue gas purification system shown in fig. 5 omits the flue gas overpressure protection device 200 which is originally independent from the flue gas pretreatment device 300, and directly improves the water seal tank 340 of the flue gas pretreatment device 300 into the flue gas overpressure protection device, so that the dust discharge function of the flue gas pretreatment device 300 and the function of the flue gas overpressure protection device are realized simultaneously.

When the water-sealed tank 340 of the flue gas pretreatment device 300 is modified to be a flue gas overpressure protection device, the depth of the bottom opening of the discharge channel of the airflow buffer inserted below the liquid level of the enclosed space 241 should be controlled to a suitable depth, so that when the air pressure of the yellow phosphorus flue gas in the airflow buffer reaches a set threshold value, the pressure relief is realized through the water-sealed tank 340.

Fig. 6 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. As shown in fig. 6, the yellow phosphorus flue gas purification system includes: the system comprises a flue gas pretreatment device 300, a flue gas filtering and dedusting device 400, a flue gas flow driving device 500 and a yellow phosphorus condensation and recovery device 600.

The flue gas pretreatment device 300 comprises an airflow buffer and a water-sealed tank 340, the airflow buffer is provided with an airflow buffer cylinder 310, an airflow buffer space is formed in the airflow buffer cylinder 310, the airflow buffer space is provided with an air inlet for receiving the yellow phosphorus flue gas from the flue gas overpressure protection device 200 and an air outlet for outputting the pretreated yellow phosphorus flue gas, the bottom of the airflow buffer cylinder 310 is provided with a discharge channel communicated with the airflow buffer space, and an opening at the bottom of the discharge channel is inserted below the liquid level of the water-sealed tank 340. The water seal tank 340 is sealed by hot water with the temperature of 30-70 ℃, preferably 40-60 ℃, the bottom opening of the discharge channel is inserted into the depth below the liquid level of the water seal tank 340 to ensure that the water seal tank 340 can maintain a water seal state all the time, and the bottom of the water seal tank 340 is provided with a discharge structure 341.

The flue gas filtering and dust removing device 400 comprises a dust remover cylinder 420 and a water seal tank 470, the filter element 410 is arranged in the dust remover cylinder 420 through a filter element mounting plate 430 and divides the dust remover cylinder into a lower original gas chamber 440 and an upper gas purifying chamber 450, the original gas chamber 440 is provided with a gas inlet for receiving yellow phosphorus flue gas to be filtered, dedusted and purified, the gas purifying chamber 450 is provided with a gas outlet for outputting the yellow phosphorus flue gas to be filtered, dedusted and purified, the bottom of the dust remover cylinder 420 is provided with a discharging channel 460 communicated with the original gas chamber 440, and the bottom opening of the discharging channel 460 is inserted below the liquid level of the water seal tank 470. The water seal tank 470 is sealed by hot water at 30-70 ℃, preferably 40-60 ℃, and a discharge structure 471 is arranged at the bottom of the water seal tank 470.

Further, the water seal tank 470 has a closed space 241 and an open space 242 constituting a communicating vessel, the bottom opening of the discharging passage is inserted below the liquid level of the closed space 241, and the upper space of the liquid level of the closed space 241 in the water seal tank 340 is connected to the diffusing tower or the yellow phosphorus condensation recovery apparatus 600 through a pipe 250.

Compared with the yellow phosphorus flue gas purification system shown in fig. 4, the yellow phosphorus flue gas purification system shown in fig. 6 omits the flue gas overpressure protection device 200 which is originally independent from the flue gas pretreatment device 300 and the flue gas filtration and dust removal device 400, and directly modifies the water seal tank 470 of the flue gas filtration and dust removal device 400 into the flue gas overpressure protection device, so that the dust discharge function of the flue gas filtration and dust removal device 400 and the function of the flue gas overpressure protection device are realized at the same time.

When the water-sealed tank 470 of the flue gas filtering and dust-removing device 400 is modified to be a flue gas overpressure protection device, the depth of the bottom opening of the discharge channel of the flue gas filtering and dust-removing device 400 inserted below the liquid level of the enclosed space 241 should be controlled to be a proper depth, so that when the air pressure of the yellow phosphorus flue gas in the airflow buffer reaches a set threshold value, the pressure relief is realized through the water-sealed tank 470.

Fig. 7 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. The yellow phosphorus-containing flue gas purification system shown in fig. 7 is an improvement on the structure of the flue gas pretreatment device 300 on the basis of the yellow phosphorus flue gas purification system shown in fig. 1. Fig. 12 is a construction diagram of a flue gas pretreatment device according to an embodiment of the present application. The flue gas pretreatment device 300 in the yellow phosphorus-growing flue gas purification system shown in fig. 7 adopts the flue gas pretreatment device shown in fig. 12.

As shown in fig. 7 and 12, the airflow buffer includes an air inlet section 311, a reducing contraction section 312, a reducing expansion section 313 and an air outlet section 314, which are sequentially arranged from bottom to top, the air inlet is arranged on the air inlet section 311, the air outlet is arranged on the air outlet section 314, and the electric heater 320 is arranged in the air outlet section 314 and is opposite to the outlet of the reducing expansion section 313.

When the airflow buffer operates, the flow velocity of the airflow is increased by using the Venturi effect when the airflow passes through the reducing contraction section 312 and the reducing expansion section 313, so that a certain airflow impact effect is exerted on dust on the electric heater 320, pollutants such as dust attached to the electric heater 320 are reduced, and the problem of reduction of the heat exchange efficiency of the electric heater 320 is solved. In addition, since the flow rate of the air flow is increased, the time for the air flow to pass through the electric heater 320 is shortened, and the yellow phosphorus can be effectively prevented from being converted into red phosphorus.

Generally, the reducing contraction section 312 is connected with the reducing expansion section 313 through a connecting neck 315, so as to facilitate manufacturing.

In addition, as shown in FIG. 12, the diameter of the exhaust section 314 is smaller than the diameter of the intake section 311, and the volume of the exhaust section 314 is also significantly smaller than the volume of the intake section 311, thereby further ensuring rapid airflow through the exhaust section 314.

The yellow phosphorus flue gas purification system shown in fig. 7 can also improve the discharging structure (ash discharging device) and discharging mode of the flue gas pretreatment device 300 and/or the flue gas filtering and dedusting device 400 according to the above embodiments.

Fig. 8 is a schematic structural diagram of a yellow phosphorus flue gas purification system according to an embodiment of the present application. The yellow phosphorus-containing flue gas purification system shown in fig. 8 is an improvement on the related structure of the flue gas filtering and dust removing device 400 on the basis of the yellow phosphorus flue gas purification system shown in fig. 1.

As shown in fig. 8, the flue gas filtering and dust removing device 400 is provided with a filter element regeneration liquid cleaning structure, a regeneration liquid discharging structure and a dust remover drying structure. Wherein, the filter element regeneration liquid cleaning structure is used for providing the filter element 410 with regeneration liquid which can clean the pollutants on the filter element 410; the regenerated liquid discharging structure is arranged at the bottom of the dust remover cylinder body 420 and is communicated with the lower part of the original gas chamber; the dust collector drying structure is used for drying the inside of the dust collector cylinder 420. Here, the regeneration liquid may be hot water.

Thus, the flue gas filtering and dust removing device 400 can realize the following filter element regeneration method: firstly, closing the air inlet of the yellow phosphorus flue gas to be filtered; then, the regeneration liquid is supplied to the filter element 410 through the filter element regeneration liquid cleaning structure; discharging the regeneration liquid out of the dust collector drum 420 through the regeneration liquid discharge structure; the interior of the dust collector drum 420 is dried by the dust collector drying structure. The regeneration mode is simpler and safer. The regeneration mode is not only suitable for the smoke filtering and dust removing device of yellow phosphorus smoke, but also suitable for the smoke filtering and dust removing device of coal gas containing tar.

Optionally, the filter element regeneration liquid cleaning structure provides the regeneration liquid to the filter element 410 through the filter element blowback ash removal structure 470. Specifically, the filter element regeneration liquid cleaning structure comprises a regeneration liquid delivery pipe 474, one end of the regeneration liquid delivery pipe 474 is connected with the compressed gas delivery pipe 471 through a second control valve, and the other end of the regeneration liquid delivery pipe 474 is connected with a regeneration liquid supply facility.

Optionally, the flue gas filtering and dust removing device 400 includes a filter element steam cleaning structure, and the filter element steam cleaning structure is used for providing steam capable of cleaning pollutants on the filter element to the filter element 410. Optionally, the steam cleaning structure of the filter element supplies the steam to the filter element 410 through the back-flushing ash-removing structure 470 of the filter element. Specifically, the cartridge steam cleaning structure includes a steam delivery pipe 475, one end of the steam delivery pipe 475 is connected to the compressed gas delivery pipe 471 through a third control valve, and the other end of the steam delivery pipe 475 is connected to a steam supply facility.

Therefore, water vapor capable of cleaning pollutants (mainly a mixture of yellow phosphorus and dust) on the filter element can be provided for the filter element 410 through the filter element steam cleaning structure, and the yellow phosphorus on the filter element 410 can be melted by the water vapor, so that the liquid yellow phosphorus carrying the dust is separated from the filter element 410. Then, a regeneration liquid (hot water) capable of cleaning the contaminants on the filter element 410 is supplied to the filter element 410 through the above-mentioned filter element regeneration liquid cleaning structure, so that the contaminants on the filter element 410 can be thoroughly cleaned. The filter element steam cleaning structure and the filter element regeneration liquid cleaning structure are combined for use, so that the use amount of regeneration liquid (hot water) can be saved.

The discharging structure of the regeneration liquid can directly utilize the discharging structure (ash discharging device) at the bottom of the flue gas filtering and dust removing device 400, so that the discharging channel 460, the discharging valve, the intermediate ash tank 481 and the storage tank 482 can be cleaned by water vapor and hot water.

Optionally, the dust collector drying structure includes a drying gas circulation loop 700 located outside the dust collector cylinder 420 and connected between the air inlet structure and the air outlet structure of the flue gas filtering and dust removing device 400, and the drying gas circulation loop 700 is provided with a drying gas heating device and may be connected to a drying gas supply pipeline. The drying gas may be nitrogen.

Specifically, the air inlet of the airflow buffer is connected with the air inlet structure through a pipeline, the air outlet structure is connected with the air inlet of the airflow buffer through a pipeline, and the pipeline between the air outlet structure and the air inlet of the airflow buffer is provided with a circulating fan 710, so that the drying air circulation loop is formed. Since the air flow damper is provided with the electric heater 320, the electric heater 320 is used as a drying air heating device.

The drying gas circulation loop 700 can not only rapidly dry the interior of the dust remover cylinder 420, but also preheat the gas flow buffer and the pipeline between the gas flow buffer and the flue gas filtering and dust removing device 400, so that the yellow phosphorus paste pipe cannot be caused when the drying gas circulation loop is in subsequent work again.

The contents related to the present application are explained above. Those of ordinary skill in the art will be able to implement the present application based on these teachings. All other embodiments, which can be derived by a person skilled in the art from the description above without inventive step, shall fall within the scope of patent protection.

Claims

1. Yellow phosphorus gas cleaning system, its characterized in that includes:

the smoke overpressure protection device is used for receiving yellow phosphorus smoke discharged by the phosphorus furnace, guiding the yellow phosphorus smoke to the diffusing tower or the yellow phosphorus condensation recovery device when the air pressure of the yellow phosphorus smoke reaches a set threshold value, and guiding the yellow phosphorus smoke to the smoke filtering and dedusting device when the air pressure of the yellow phosphorus smoke does not reach the set threshold value;

the smoke filtering and dedusting device is used for receiving the yellow phosphorus smoke from the smoke overpressure protection device, physically intercepting dust in the yellow phosphorus smoke through the filter element under the condition that the yellow phosphorus in the yellow phosphorus smoke is in a gaseous state, and outputting the yellow phosphorus smoke after filtering, dedusting and purifying;

the yellow phosphorus condensation recovery device is used for receiving the yellow phosphorus flue gas from the flue gas filtering and dust removing device, directly or indirectly condensing the yellow phosphorus flue gas through a cooling medium, converting the yellow phosphorus from a gaseous state into a liquid state, storing the liquid state in a yellow phosphorus tank, and outputting tail gas;

the smoke overpressure protection device comprises a cylindrical container, an opening on one side of the cylindrical container is connected with the phosphorus furnace through a first vertical inclined pipe, an opening on the other side of the cylindrical container is connected with the smoke filtering and dust removing device through a second vertical inclined pipe, and an opening at the bottom of the cylindrical container is inserted below the liquid level of the water seal tank;

the water seal tank is provided with a closed space and an open space which form a communicating vessel, the bottom opening of the cylindrical container is inserted below the liquid level of the closed space, and the upper space of the liquid level of the closed space in the water seal tank is connected with the diffusing tower or the yellow phosphorus condensation recovery device through a pipeline.

2. The yellow phosphorus flue gas purification system of claim 1, wherein:

the device comprises a flue gas pretreatment device, a flue gas purification device and a flue gas purification and dedusting device, wherein the flue gas pretreatment device is arranged between the flue gas overpressure protection device and the flue gas filtration and dedusting device and is used for receiving yellow phosphorus flue gas from the flue gas overpressure protection device, pretreating the yellow phosphorus flue gas and outputting the pretreated yellow phosphorus flue gas;

the smoke filtering and dedusting device is used for receiving the yellow phosphorus smoke from the smoke pretreatment device, physically intercepting dust in the yellow phosphorus smoke through the filter element under the condition that the yellow phosphorus in the yellow phosphorus smoke is still in a gaseous state, and then outputting the yellow phosphorus smoke after filtering, dedusting and purifying;

the flue gas pretreatment device comprises an airflow buffer, the airflow buffer is provided with an airflow buffer cylinder, an airflow buffer space is formed in the airflow buffer cylinder, and an air inlet used for receiving yellow phosphorus flue gas from the flue gas overpressure protection device and an air outlet used for outputting the pretreated yellow phosphorus flue gas are arranged on the airflow buffer space.

3. The yellow phosphorus flue gas purification system of claim 1, wherein:

the device comprises a flue gas pretreatment device, a smoke overpressure protection device and a phosphorus furnace, wherein the flue gas pretreatment device is arranged between the flue gas overpressure protection device and the phosphorus furnace and is used for receiving yellow phosphorus flue gas discharged by the phosphorus furnace, pretreating the yellow phosphorus flue gas and outputting the pretreated yellow phosphorus flue gas;

the smoke overpressure protection device is used for receiving the yellow phosphorus smoke from the smoke pretreatment device, guiding the yellow phosphorus smoke to a diffusing tower or a yellow phosphorus condensation recovery device when the air pressure of the yellow phosphorus smoke reaches a set threshold value, and guiding the yellow phosphorus smoke to a smoke filtering and dedusting device when the air pressure of the yellow phosphorus smoke does not reach the set threshold value;

the flue gas pretreatment device comprises an airflow buffer, the airflow buffer is provided with an airflow buffer cylinder body, an airflow buffer space is formed in the airflow buffer cylinder body, and an air inlet used for receiving the yellow phosphorus flue gas from the flue gas overpressure protection device and an air outlet used for outputting the pretreated yellow phosphorus flue gas are arranged on the airflow buffer space.

4. The yellow phosphorus flue gas purification system of claim 2 or 3, wherein: the airflow buffer is provided with an air inlet section, a diameter-variable contraction section, a diameter-variable expansion section and an air exhaust section which are sequentially arranged from bottom to top, wherein the air inlet is arranged on the air inlet section, and the air outlet is arranged on the air exhaust section; the flue gas pretreatment device further comprises an electric heater, and the electric heater is installed in the exhaust section and is arranged opposite to the outlet of the reducing and expanding section.

5. The yellow phosphorus flue gas purification system of claim 2 or 3, wherein: the bottom of the airflow buffer cylinder is provided with a discharge channel communicated with the airflow buffer space;

the flue gas preprocessing device also comprises a water seal groove, the discharging channel is inserted below the liquid level of the water seal groove, and the bottom of the water seal groove is provided with a discharging structure.

6. The yellow phosphorus flue gas purification system of claim 1, wherein: the flue gas filters dust collector contains the dust remover barrel, the filter core passes through the filter core mounting panel to be installed in this dust remover barrel and separates this dust remover barrel for the former air chamber of lower part and the air-purifying chamber on upper portion, be equipped with the air inlet that is used for receiving the yellow phosphorus flue gas of waiting to filter dust removal purification on the former air chamber, be equipped with the gas vent that is used for exporting the yellow phosphorus flue gas after filtering dust removal purification on the air-purifying chamber, the bottom of dust remover barrel be equipped with the communicating discharge passage of former air chamber.

7. The yellow phosphorus flue gas purification system of claim 6, wherein: the flue gas filtering and dust removing device further comprises a water seal groove, the discharging channel is directly inserted below the liquid level of the water seal groove, and a discharging structure is arranged at the bottom of the water seal groove.

8. The yellow phosphorus flue gas purification system of claim 1, wherein: the yellow phosphorus condensation recovery device comprises more than 2 spray towers which are connected in series or in parallel, wherein the spray towers directly spray cooling liquid to yellow phosphorus flue gas so as to condense the yellow phosphorus flue gas, so that the yellow phosphorus is converted from a gas state to a liquid state and then is stored in a yellow phosphorus tank at the bottom of the spray towers;

and/or the water seal tank is provided with a lower tank body and an upper tank body, the upper tank body is arranged in the lower tank body in an inverted buckling mode through a connecting piece connected between the lower tank body and the upper tank body, a bottom channel and a side channel are reserved between the upper tank body and the lower tank body, so that a closed space is formed between the inside of the upper tank body and the bottom channel, and an open space is formed in the side channel;

and/or an overflow port communicated with the upper part of the open space is arranged on the water seal tank, and when the liquid level in the open space rises to the overflow port, overflow is realized.

9. The yellow phosphorus flue gas purification system of claim 8, wherein: the yellow phosphorus condensation recovery device comprises M spray towers which are connected in series, wherein M is an integer more than or equal to 2;

the smoke overpressure protection device guides the yellow phosphorus smoke to an Nth spray tower in the yellow phosphorus condensation recovery device according to the flowing direction of yellow phosphorus smoke airflow when the pressure of the yellow phosphorus smoke reaches a set threshold, wherein N is an integer which is not less than 2 and not more than M.

10. Industrial kiln gas cleaning device, its characterized in that includes:

the smoke overpressure protection device is used for receiving smoke discharged by the industrial kiln and guiding the smoke to a diffusing tower or subsequent equipment of the smoke filtering and dust removing device when the air pressure of the smoke reaches a set threshold value, and guiding the smoke to the smoke filtering and dust removing device when the air pressure of the smoke does not reach the set threshold value; and

the smoke filtering and dust removing device is used for receiving smoke from the smoke overpressure protection device, physically intercepting dust in the smoke through a filter element, and outputting the smoke after filtering, dust removing and purifying;

the smoke overpressure protection device comprises a cylindrical container, an opening at one side of the cylindrical container is connected with the industrial kiln through a pipeline, an opening at the other side of the cylindrical container is connected with the smoke filtering and dust removing device through a pipeline, and an opening at the bottom of the cylindrical container is inserted below the liquid level of the liquid seal tank;

the liquid seal tank is provided with a closed space and an open space which form a communicating vessel, the bottom opening of the cylindrical container is inserted below the liquid level of the closed space, and the upper space of the liquid level of the closed space in the liquid seal tank is connected with the subsequent equipment of the diffusing tower or the smoke filtering and dust removing device through a pipeline.