CN112029952A

CN112029952A - Converter pure dry dedusting system integrating high temperature constant temperature, high temperature purification and waste heat recovery

Info

Publication number: CN112029952A
Application number: CN202010839117.4A
Authority: CN
Inventors: 何志忠; 钱雷; 何莉; 张含笑; 丁钧; 侯运升; 邹元龙; 张鹏; 曾正强; 李钰; 韩志强; 陈媛; 李乌龙
Original assignee: Guangzhou Huaxin Engineering Technology Co ltd; Beijing Blue Sky Yipeng Technology Development Co ltd
Current assignee: Guangzhou Huaxin Engineering Technology Co ltd; Beijing Blue Sky Yipeng Technology Development Co ltd
Priority date: 2020-06-25
Filing date: 2020-08-19
Publication date: 2020-12-04
Also published as: CN213388753U

Abstract

The invention belongs to the field of energy conservation and environmental protection, and particularly relates to a converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery. The device comprises a vaporization cooling flue, a high-temperature phase-change type heat storage device, a high-temperature-resistant pulse injection ceramic filter tube type dust removal device, a waste heat recovery system and an explosion venting and escaping flue gas trapping and processing system. The converter gas is not directly contacted with water in the cooling process, the gas does not contain water, the CO loss is reduced, the gas recovery amount is large, the transportation and the use are facilitated, and the gas quality is high. The full waste heat recovery device is utilized to recover the waste heat of the converter flue gas to the maximum extent, and the steam is stably produced for power generation or production and use, so that the energy-saving benefit is obvious. Besides recovering heat and coal gas, various dusts are not mixed with water, so that the dust is easy to separate, recover and reuse, does not cause secondary pollution, and does not have wastewater treatment cost.

Description

Converter pure dry dedusting system integrating high temperature constant temperature, high temperature purification and waste heat recovery

Technical Field

The invention belongs to the field of energy conservation and environmental protection, and particularly relates to a converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery.

Background

In recent years, haze weather frequently appears in China, and the problem of air quality has attracted high attention of the whole society. The iron and steel industry, as a major consumer of industrial emissions, is increasingly subject to strict limits on emission standards and emissions.

The steel industry in China is in the period of structure adjustment and optimization upgrading, faces increasingly severe resource and environmental pressure, and has to go through resource-saving and environment-friendly sustainable development.

The converter steelmaking, which is the main steelmaking process of steel enterprises, generates gas containing carbon monoxide as a main component, a small amount of carbon dioxide and other trace components in the blowing process, and also carries a large amount of iron oxide, metal iron particles and other fine particle solid dust, thus seriously polluting the atmosphere and the workshop environment. Therefore, the technical level of the converter dust removal system is improved, and the recovery and utilization of converter gas and the recovery of flue gas waste heat have great significance for saving energy and reducing consumption in steelmaking, effectively controlling and reducing the emission of steelmaking atmospheric pollutants and reducing environmental pollution.

The temperature of the converter flue gas outlet is about 1400-1600 ℃, and the dust concentration is 70-200 g/m³After leaving the furnace mouth, the gas is cooled to 800-1000 ℃ by a vaporization cooling flue or a water cooling flue, and then enters a flue gas dust removal system to reduce the dust concentration so as to meet the national emission standard and the requirements of gas users. At present, the domestic converter primary flue gas dust removal process mainly comprises the traditional OG method, the new OG method, the semi-dry method, the dry method (LT method) and other dust removal processes.

At present, no matter which process system is adopted for primary flue gas purification of the converter, the common characteristics of the process systems are that the cooling of high-temperature flue gas is realized, the cooling of the flue gas is realized by absorbing latent heat of vaporization through evaporation of water, and a large amount of steam is consumed for dry (LT) dedusting because of the requirements of the system. Cooling the flue gas by consuming water is an efficient cooling method, but a very energy consuming method. Since the high-temperature flue gas from the evaporative cooling flue is a high-grade heat energy, not only the heat energy carried by the high-temperature flue gas is not recovered, but also a large amount of other energy sources are consumed to cool the high-temperature flue gas, which causes a large amount of energy waste and is also a main reason for forming smoke plume. For example, under the general design condition, the temperature of the flue gas discharged from the vaporization flue is 800-1000 ℃, and if the temperature of the flue gas is simply reduced to 500 ℃, steam generated by ton steel can reach 20kg, and huge benefit can be generated.

The dry dedusting always has high danger of gas explosion, and the electrostatic deduster cannot avoid the problem of high-voltage flashover of an electric field, so that the explosion venting problem of the electrostatic deduster is caused. In the actual production and operation process of the converter primary flue gas dry electrostatic dust removal system, due to the frequent occurrence of the explosion unloading problem and the smoke generation problem, the converter primary flue gas dry electrostatic dust removal system can not always ensure the stable standard of the flue gas emission. Meanwhile, the explosion venting of the electrostatic dust collector also causes secondary pollution of an operation post.

Because the flue gas is cooled by spraying water and steam, the flue gas contains a large amount of moisture, and the flue gas pipeline, the polar plate and the shell of the electrostatic dust collector, the gas pipeline and the gas recovery equipment are corroded.

Because oxygen blowing smelting is not continuous in the converter steelmaking process, the vaporization cooling flue and the waste heat recovery device of the converter primary dedusting system are always in the working state of heating and cooling alternate circulation, so that the alternating thermal stress of the vaporization cooling flue and the waste heat recovery device is very large. The vaporization cooling flue and the waste heat recovery device have short service life and large daily maintenance and repair workload under the action of alternating thermal stress, and also have great influence on converter steelmaking production to a certain extent.

Explosion venting devices arranged in the existing converter primary dust removal system are all directly communicated with the atmosphere, and secondary pollution to the operation post environment to a certain extent can be caused when the system is subjected to explosion venting.

Disclosure of Invention

The invention aims to provide a converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery.

The converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery comprises a vaporization cooling flue, a high temperature phase change type heat storage device, a high temperature pulse blowing resistant ceramic filter tube type dedusting device, a waste heat recovery system and an explosion venting and escaping flue gas collecting and processing system,

wherein the waste heat recovery system comprises a membrane water wall combined type waste heat recovery device with a heat pipe capable of being replaced independently, the membrane water wall combined type waste heat recovery device with the heat pipe capable of being replaced independently comprises an upper box body, a plurality of sections of waste heat recovery sections, a middle transition section and an ash bucket, wherein the upper box body is positioned above the waste heat recovery sections, the middle transition section is positioned between the adjacent waste heat recovery sections, the ash bucket is positioned at the tail end of the waste heat recovery sections,

the upper box body is provided with a high-temperature flue gas inlet, the shell of the waste heat recovery section is a membrane water-cooled wall, the membrane water-cooled wall of the waste heat recovery section is provided with a heat pipe which is inserted from the outside and can be independently replaced, the heating surface of the heat pipe which can be independently replaced is coated with a heat-resistant and corrosion-resistant coating,

the high-temperature flue gas is cooled and simultaneously subjected to waste heat recovery through the vaporization cooling flue, the high-temperature phase-change type heat storage device adopting the micro-packaging process and the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipe, in the process, the high-temperature phase-change type heat storage device adopting the micro-packaging process is used for heat storage or discharge,

the high-temperature flue gas outlet of the vaporization cooling flue is connected with the high-temperature phase-change type heat storage device, the high-temperature flue gas outlet of the high-temperature phase-change type heat storage device is connected with the high-temperature pulse-jetting ceramic filter tube dust removal device of the built-in high-temperature phase-change type heat accumulator, and the high-temperature flue gas passes through the vaporization cooling flue, the high-temperature phase-change type heat storage device, the high-temperature pulse-jetting ceramic filter tube dust removal device of the built-in high-temperature phase-change type heat accumulator and the waste heat recovery system to be cooled, and simultaneously, waste heat is recovered, wherein the high-temperature phase-change type heat storage device and the high-temperature pulse.

According to the converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery, the high temperature phase change type heat storage device comprises a circular shell and an ash bucket, wherein the shell comprises an upper box body and a middle box body, a high temperature phase change heat storage core is arranged in the middle box body, the upper box body is positioned at the upper part of the middle box body, which is provided with the high temperature phase change heat storage core, and the ash bucket is positioned below the middle box body;

the upper box body is provided with a high-temperature flue gas outlet, the middle box body or the ash bucket is provided with a high-temperature flue gas inlet, the high-temperature flue gas inlet is provided with a primary cyclone separation/airflow uniform distribution device, and the high-temperature flue gas inlet is accessed along the tangential direction of the circular shell;

uniformly distributed air flow cavities are formed in the straight section of the pipe wall at the lower part of the dust-containing flue gas primary cyclone separation/air flow uniform distribution device;

the lower part of the ash bucket is provided with a dust-removing pneumatic conveying transmitter device;

the high-temperature phase change heat storage core is a honeycomb tube bundle, and gaps between the high-temperature phase change heat storage core and the middle box body are high-temperature flue gas flowing channels;

a gas shock wave soot blower is arranged in the upper box body and used for blowing and cleaning high-temperature flue gas flowing through the wall of the channel cavity;

the bottom of the ash bucket is provided with a device for fluidizing, flame-retarding and explosion-proof compressed nitrogen injection;

and a flame-retardant/explosion-proof compressed nitrogen injection device is arranged in a vortex region where the middle box body, the ash bucket and the high-temperature flue gas primary cyclone separation/air flow sharing device are intersected.

According to the pure dry converter dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery, the high temperature and constant temperature pulse injection ceramic filter tube type dedusting device comprises a shell and an ash bucket, wherein the shell comprises an upper box body and a middle box body from top to bottom, the upper box body and the middle box body are separated through a partition plate, and the ash bucket is positioned below the middle box body;

the upper box body is provided with a clean high-temperature flue gas outlet, the middle box body or the ash bucket is provided with a dust-containing high-temperature flue gas inlet, the dust-containing high-temperature flue gas inlet is provided with a dust-containing flue gas primary cyclone separation/airflow equalization device, the dust-containing high-temperature flue gas inlet is connected along the tangential direction of a circular shell and is used for carrying out primary separation and sedimentation treatment on high-temperature dust-containing flue gas entering a dust remover together with the dust-containing flue gas primary cyclone separation/airflow equalization device arranged in the middle box body or the ash bucket, and uniformly distributed airflow cavities are formed in the straight section of the pipe wall at the lower part of the dust-containing flue gas primary cyclone separation/airflow equalization device;

a honeycomb-shaped high-temperature phase change heat storage device is arranged below the partition plate in the middle box body, the high-temperature phase change heat storage device is provided with cavities, a ceramic filter tube is arranged in each cavity, the upper end part of each ceramic filter tube is open, the lower end part of each ceramic filter tube is sealed, micropores are formed in the tube wall of each ceramic filter tube, and the upper end parts of the ceramic filter tubes are sealed and fixed on the partition plate;

a blowing ash removal device is arranged in the upper box body, a plurality of nozzles are arranged on the blowing ash removal device, and the nozzles respectively correspond to the ceramic filter tubes;

the bottom of the ash bucket is provided with a fluidization/flame-retardant/explosion-proof compressed nitrogen injection device controlled by an air source valve;

and a flame-retardant/explosion-proof compressed nitrogen injection device is arranged in the intersection vortex region of the middle box body, the ash hopper and the dust-containing flue gas primary cyclone separation/airflow distribution device.

According to the converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery, the explosion-proof system comprises a spring self-resetting explosion-proof device capable of preventing explosion-proof smoke dust from escaping, an explosion-proof overflow smoke collecting and processing system jet flow induced air device and an explosion-proof overflow smoke temperature-adjusting flame arrester.

According to the pure dry dedusting system of the converter integrating high temperature and constant temperature, high temperature purification and waste heat recovery, the spring self-resetting explosion venting device capable of preventing explosion venting smoke dust from escaping comprises an escaping smoke trapping cover shell and a spring self-resetting valve plate component, wherein,

the upper part of the external flue gas trapping cover shell is provided with an external flue gas guide outlet which is connected with a flue gas pipeline of the explosion venting external flue gas trapping treatment system,

the spring self-resetting valve plate assembly comprises a valve plate, a valve plate guide rod, a self-resetting spring set and a self-resetting spring set fixing frame, wherein,

the spring self-resetting valve plate assembly is fixed at the lower part of the inner cavity of the escape trapping shell through the valve plate guide rod; the upper part of the valve plate guide rod is provided with a valve plate guide rod and a self-resetting spring set fixing frame, the self-resetting spring set is fixed on the valve plate guide rod and the self-resetting spring set fixing frame, the self-resetting spring set applies pressure to the valve plate in a downward balanced manner,

the lower part of the valve plate is provided with an explosion venting flue gas leading-in port,

and the valve plate of the spring self-resetting valve plate assembly is sealed with the flange surface on the inner side of the lower part of the external smoke trapping cover shell through a sealing ring.

According to the converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery, the waste heat recovery system further comprises a multistage combined flue gas waste heat recovery device adopting a reinforced fin heat exchange tube structure.

According to the converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery, the converter primary pure dry dedusting system comprises a pulse blowing filter bag/filter cartridge type deduster.

Has the advantages that:

1. the adoption of the high-temperature-resistant pulse spraying ceramic filter tube dust removal device can eliminate the frequent micro-explosion phenomenon caused by electric precipitation sparks, so that the system is safer to operate.

2. Compared with other dust removal and purification modes, the high-temperature-resistant pulse-injection ceramic filter tube dust removal device has high and stable efficiency, can ensure stable recovery of clean dry coal gas and quality of discharged flue gas, and has dust content of less than or equal to 10mg/Nm³。

3. Among many high-temperature gas purification and dust removal process technologies, the medium filtration purification technology has significant advantages. It realizes gas-solid separation through a high-temperature filter medium, and achieves the purposes of purifying gas and recovering resources through a high-temperature full-dry method. Not only can utilize the sensible heat of the gas to the maximum extent and improve the energy utilization rate, but also can simplify the process and save the investment of process equipment.

The high-temperature-resistant pulse-jet ceramic filter tube dust removal device can effectively realize the ultrafine purification and filtration treatment of the flue gas in a high-temperature state, provides favorable conditions for the subsequent high-temperature flue gas waste heat recovery, is not only favorable for the waste heat recovery device to improve the waste heat recovery efficiency, but also can effectively improve the working operation reliability and stability of the waste heat recovery device, and can also greatly improve the waste heat recovery service life and reduce the maintenance and repair workload.

4. The whole dry dedusting process has no water, the temperature of the recovered coal gas is low, the working condition air quantity of a primary fan is reduced, the power consumption of the fan is saved, and the water-saving, power-saving and environment-friendly benefits are obvious.

5. The converter gas is not directly contacted with water in the cooling process, the gas does not contain water, the CO loss is reduced, the gas recovery amount is large, the transportation and the use are facilitated, and the gas quality is high.

6. The full waste heat recovery device is utilized to recover the waste heat of the converter flue gas to the maximum extent, and the steam is stably produced for power generation or production and use, so that the energy-saving benefit is obvious.

7. Besides recovering heat and coal gas, various dusts are not mixed with water, so that the dust is easy to separate, recover and reuse, does not cause secondary pollution, and does not have wastewater treatment cost.

Drawings

FIG. 1 is a schematic structural diagram of a converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery;

FIG. 2 is a schematic structural diagram of a high-temperature phase-change thermal storage device;

FIG. 3 is a schematic structural view of a high-temperature constant-temperature pulse-blowing ceramic filter tube type dust removal device;

FIG. 4 is a schematic structural diagram of a spring self-resetting explosion venting device for preventing explosion venting smoke from escaping;

FIG. 5 is a schematic structural diagram of a membrane wall combined waste heat recovery device with independently replaceable heat pipes.

1, converter; 3: a gasification cooling flue; 4: the spring self-resetting explosion venting device can prevent explosion venting smoke dust from escaping; 5: the membrane type water-cooled wall combined waste heat recovery device can independently replace the heat pipe; 6: a high temperature phase change thermal storage device; 7: a high-temperature-resistant pulse-jet ceramic filter tube type dust removal device; 23: the jet flow induced draft device of the explosion venting overflow flue gas trapping treatment system; 17: a flue gas temperature conditioning/flame arrestor; 24: a pulse blowing cloth bag/filter cartridge type dust remover; 27: a torch waste heat recovery device with a reinforced fin heat exchange tube structure is adopted; 39: a multistage combined flue gas waste heat recovery device with a reinforced fin heat exchange tube structure is adopted;

2-1: a high-temperature flue gas outlet of the high-temperature phase change heat storage device; 2-2: the high-temperature phase change heat storage device is arranged on the box body; 2-4: a housing; 2-5: a high temperature phase change heat storage core; 2-8: a middle box body; 2-9: an ash hopper; 2-12: the high-temperature phase change heat storage device compresses the nitrogen blowing device; 2-15: a high-temperature flue gas inlet of the high-temperature phase change heat storage device; 2-16: the dust-containing flue gas primary cyclone separation/gas flow equipartition device; 2-17: a fixing seat is arranged on the high-temperature phase change heat storage core; 2-18: pipe bundle and clearance channel for high-temperature flue gas to flow through

3-4: an ash hopper; 3-5: a dust-containing high-temperature flue gas inlet; 3-10: a high temperature phase change thermal storage device; 3-11: a housing; 3-12: a ceramic filter tube; 3-17: a blowing ash removal device; 3-18: a clean high-temperature flue gas outlet; 3-19: an upper box body; 3-20: a partition plate; 3-21: a middle box body; 3-22: the dust-containing flue gas primary cyclone separation/gas flow equipartition device.

4-2: an explosion venting and escaping flue gas collecting and processing system flue gas pipeline; 4-2: explosion venting and escaping trapping cover shell; 4-7: a self-resetting spring set; 4-8: a valve plate guide rod and a self-resetting spring set fixing frame; 4-9: a valve plate guide rod; 4-10: a valve plate; 4-14: an outward escape flue gas outlet; 4-15: an explosion venting flue gas inlet;

5-1: the combined waste heat recovery device is arranged on the box body; 5-2: a waste heat recovery section; 5-3: a middle transition section; 5-4: an ash hopper; 5-5: a gas shock wave soot blower; 5-6: a membrane wall; 5-7: a high-temperature flue gas inlet of the combined waste heat recovery device; 5-8: an access hole door; 5-9: a heat pipe; 5-10: a barrier; 5-11: a cooled flue gas outlet of the combined waste heat recovery device; 5-12: a compressed nitrogen blowing device of the combined waste heat recovery device; 5-13: pneumatic conveying transmitter for dust removal

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

wherein the waste heat recovery system comprises a membrane water wall combined type waste heat recovery device with a heat pipe capable of being replaced independently,

The steam-water system of the vaporization cooling flue adopts a composite circulation cooling mode combining natural circulation and forced circulation. The evaporative cooling flue of the converter flue gas full dry method waste heat recovery and bag-type dust removal system is basically the same as the traditional evaporative cooling flue, belongs to the mature technology, but needs to be modified in local structure according to the characteristics of the full dry method dust removal system.

The basic working principle of the high-temperature phase change heat storage device is as follows: when the converter is in an oxygen blowing smelting working state (the temperature of the passing flue gas is highest and the amount of the flue gas is largest at the moment), the high-temperature flue gas enters the high-temperature phase-change heat storage device through an inlet arranged on the middle box body or the ash bucket along the tangential direction of the box body, is subjected to primary separation and purification through a primary cyclone separation/gas flow uniform distribution device arranged at the inlet, then rises in the cylinder body, flows through a high-temperature phase-change heat storage core arranged in the high-temperature phase-change heat storage device, and in a constant high-temperature section (namely 700-850 ℃), a large amount of heat of the high-temperature flue gas is absorbed in time through phase change of a high-temperature phase-change heat storage material filled in the high-temperature heat storage core, and then flows out through a; when the converter is in a smelting working state without blowing oxygen (the temperature of the smoke passing through is relatively low and the amount of the smoke is less), the high-temperature phase-change heat storage material quickly releases a large amount of heat to the smoke passing through the high-temperature phase-change heat storage material when the phase change occurs in a constant high-temperature section (namely 700-850 ℃), the temperature of the passing smoke is increased, and the high-temperature smoke after the temperature increase flows out from a high-temperature smoke outlet arranged on a box body at the upper part of the high-temperature phase-change heat storage device. Therefore, the effect of alternating thermal stress of the high-temperature dust removal device and the waste heat recovery device in the dust removal system is avoided, the service lives of the high-temperature dust removal device and the waste heat recovery device are effectively prolonged, the daily maintenance and maintenance workload is reduced to the maximum extent, and the stability and the reliability of converter steelmaking production are ensured.

The device also forms a set of constant temperature system together with the gas burner, thereby avoiding the impact of the particularity of the converter steelmaking production process on the reciprocating rapid heating and quenching of the vaporization cooling flue, the high-temperature-resistant pulse injection ceramic filter tube type dust removal device and the waste heat recovery device.

The high-temperature-resistant pulse-jet ceramic filter tube type dust removal device adopts the high-temperature-resistant pulse-jet ceramic filter tube type dust removal device to effectively and superficially purify and filter primary high-temperature flue gas of the converter, so that stable ultralow emission and remarkable improvement on the cleanliness of recycled dry coal gas can be realized. Because the primary high-temperature flue gas of the converter is subjected to fine purification and filtration treatment in advance at a high temperature, more favorable conditions are created for subsequent recovery of the waste heat of the high-temperature flue gas.

In addition, the adoption of the high-temperature-resistant pulse-injection ceramic filter tube type dust removal device can fundamentally avoid the explosion venting problem of the electrostatic dust remover caused by the fact that the electrostatic dust remover cannot avoid electric field high-voltage flashover, and the hidden danger of gas explosion of a primary dust removal system of the converter is eliminated to the maximum extent.

The membrane water wall combined type waste heat recovery device (namely a waste heat boiler) with the independently replaceable heat pipe adopts a convection heat exchange surface, and solves a series of problems of preventing local accumulation and explosion of coal gas, dust accumulation, abrasion, dust removal, heat exchange and the like. The device recovers the waste heat of high-temperature flue gas through heat exchange pieces such as independently arranged heat pipes, membrane type water-cooled walls and the like, and plays a role in cooling the high-temperature flue gas and primary settling separation treatment of dust in the flue gas.

The multi-stage combined flue gas waste heat recovery device adopting the reinforced fin heat exchange tube structure is used for realizing full waste heat recovery of primary flue gas of the converter, ensures the required temperature of clean dry gas recovery, and absorbs waste heat from the flue gas to the maximum extent. The method adopts a forced water cooling mode to cool the flue gas, softened water is adopted for cooling, and the softened water is used as an evaporator of a waste heat recovery device to supply water after being heated to a certain degree, so that the full recovery of the primary flue gas waste heat of the converter is realized.

The torch waste heat recovery device adopting the reinforced fin heat exchange tube structure is used for realizing the full waste heat recovery of the primary flue gas of the converter, the effective recovery of the heat of the released flue gas torch is realized by adopting a forced water cooling mode, softened water is adopted, and the softened water is used as a waste heat recovery device evaporator to supply water after being heated to a certain degree, so that the full recovery of the primary flue gas waste heat of the converter is realized.

The converter primary pure dry dedusting system is formed by a high-temperature phase-change type heat storage device adopting a micro-packaging process, a gas burner blower, a water-cooling two-way high-temperature reversing valve, a water-cooling three-way high-temperature reversing valve and the like, and is a converter pure dry dedusting system integrating high-temperature constant temperature, high-temperature purification and waste heat recovery. The system has the main function of aiming at the technological characteristics (namely intermittent production) of converter steelmaking, and furthest preventing the vaporization cooling flue and the waste heat recovery device of the converter primary dedusting system from being impacted by reciprocating rapid heating and rapid cooling.

The explosion venting and escaping smoke trapping and treating system comprises a spring self-resetting explosion venting device capable of preventing explosion venting smoke dust from escaping, a smoke pipeline of an explosion venting and escaping smoke trapping and treating system, a jet flow induced draft device of the explosion venting and escaping smoke trapping and treating system and an explosion venting and escaping smoke temperature regulating/fire arrester, and has the main functions of effectively trapping the explosion venting and escaping smoke dust at the moment, cooling, inflaming retarding and explosion resisting treatment, and then sending the smoke dust into an explosion-proof type medium-temperature-resistant or high-temperature-resistant filter material ultralow-emission pulse blowing filter bag/filter cartridge type dust remover in the system for purification and filtration treatment and then discharging the smoke dust together with main stream smoke of the system.

The anti-explosion type intermediate temperature resistant or high temperature resistant filter material ultra-low emission pulse spraying filter bag/filter cylinder type dust collector is used for purifying and filtering the trapped large-explosion-venting instantaneous escaping smoke dust, the converter smoke pure dry method full waste heat recovery dust collection system adopts the anti-explosion type intermediate temperature resistant or high temperature resistant filter material ultra-low emission pulse spraying filter bag/filter cylinder type dust collector, which not only avoids the unsafe factors of micro-explosion caused by electric sparks of the electric dust collector, but also avoids the problems of bag pasting and the like through a high temperature smoke dry method waste heat recovery cooling mode, and the dust collection effect is stable and superior to that of the electric dust collection and wet dust collection processes. And the bottom of the dust removal system is provided with a dust collecting and conveying system.

The vaporizing cooling flue, the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipe, the high-pressure steam drum and the low-pressure steam drum form a steam-water system for recovering the full waste heat of the primary flue gas, wherein,

the high-pressure steam pocket, the downcomer, the heat pipe evaporator at the upper part of the membrane water-cooled wall combined type waste heat recovery device with the independently replaceable heat pipe, the membrane water-cooled wall evaporator at the upper part of the membrane water-cooled wall combined type waste heat recovery device with the independently replaceable heat pipe and the riser form a high-pressure evaporator system;

water in the high-pressure steam pocket enters an evaporator of the evaporative cooling flue through a descending pipe, absorbs heat of flue gas to form a steam-water mixture, enters the high-pressure steam pocket through an ascending pipe, is separated by a steam-water separator in the high-pressure steam pocket, and then steam is conveyed into a heat accumulator from the high-pressure steam pocket;

the heat pipe evaporator in the middle of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipes forms a coal economizer, water from the water dividing header is heated to 170 ℃, and then the water is sent to the high-pressure steam pocket;

the low-pressure steam pocket, the downcomer, the lower heat pipe evaporator of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipe, the lower membrane water wall evaporator of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipe, the riser and the like form a low-pressure evaporator system;

water in the low-pressure steam pocket enters each evaporator through a downcomer to absorb heat of flue gas to form a steam-water mixture, and low-pressure saturated steam generated by entering the low-pressure steam pocket through an ascending pipe is conveyed to a deaerator and used for boiler water supply heating and deaerating.

The device can effectively recover the full waste heat of the flue gas under the working states of converter oxygen blowing smelting and non-oxygen blowing smelting together with a torch waste heat recovery device adopting a reinforced fin heat exchange tube structure, a multi-stage flue gas water cooler with fins and a waste heat recovery device, generates saturated steam, effectively recovers the waste heat of the flue gas at the temperature of less than or equal to 200 ℃, and preheats softened water by using the recovered heat energy.

The system operation mode of the present invention:

1. under the working condition of oxygen blowing smelting

Before oxygen blowing smelting is carried out on the converter, a water-cooling three-way high-temperature reversing valve in the system acts to conduct connection between a high-temperature flue gas outlet of a vaporization cooling flue and a high-temperature phase-change type heat storage device, and meanwhile, a water-cooling two-way high-temperature reversing valve in the system acts to conduct connection between the high-temperature flue gas outlet of the high-temperature phase-change type heat storage device and a high-temperature pulse blowing ceramic filter tube dust removal device of a built-in high-temperature phase-change type heat accumulator. During the oxygen blowing smelting work period of the converter, under the suction action of the axial flow fan, high-temperature flue gas generated by oxygen blowing of the converter passes through the vaporization cooling flue, the high-temperature flue gas pipeline, the high-temperature phase-change type heat storage device, a high-temperature pulse blowing ceramic filter tube dust removal device with the built-in high-temperature phase-change type heat storage device, a membrane water-cooled wall combined type waste heat recovery device with independently replaceable heat tubes, the flue gas pipeline, a multistage combined flue gas waste heat recovery device with a reinforced fin heat exchange tube structure and the like. During the period, the high-temperature flue gas is cooled/subjected to waste heat recovery and hyperfine purification and filtration treatment, and meanwhile, a high-temperature phase-change type heat storage device adopting a micro-packaging process and a high-temperature pulse injection ceramic filter tube dust removal device internally provided with the high-temperature phase-change type heat accumulator are used for storing heat.

The smoke of the front section and the rear section of the oxygen blowing smelting is switched by a gas recovery/smoke diffusion switching valve and is diffused into the atmosphere through a diffusion chimney, a diffusion gas torch and a torch waste heat recovery device adopting a reinforced fin heat exchange tube structure.

Clean and dry coal gas in the middle stage of oxygen blowing smelting is switched by a coal gas recovery/flue gas diffusion switching valve, and the coal gas is collected into a coal gas cabinet-30 through a coal gas recovery pipeline.

2. Under the working state of non-oxygen blowing smelting

During the period that the converter does not carry out oxygen blowing smelting, the action of a water-cooling three-way high-temperature reversing valve in the system respectively conducts the connection between a high-temperature flue gas outlet of a vaporization cooling flue and a high-temperature pulse blowing-resistant ceramic filter tube dust removal device with a built-in high-temperature phase change type heat accumulator and the connection between the high-temperature phase change type heat accumulation device adopting the micro-packaging process and a gas burner, and meanwhile, the action of the water-cooling two-way high-temperature reversing valve in the system conducts the connection between a gas burner blower and the high-temperature phase change type heat accumulation device adopting the. During the non-oxygen blowing smelting work period of the converter, under the suction action of an axial flow fan, the gas burner utilizes air blown by a gas burner blower to pass through a high-temperature phase-change heat storage device for high-temperature preheating, and high-temperature flue gas generated by gas CO sprayed into the gas burner and sprayed into the gas burner passes through a vaporization cooling flue, a high-temperature flue gas pipeline, a high-temperature pulse spraying ceramic filter tube dust removal device with a built-in high-temperature phase-change heat accumulator, a membrane water-cooled wall combined type waste heat recovery device with independently replaceable heat pipes, a flue gas pipeline, a multi-stage combined flue gas waste heat recovery device with a reinforced fin heat exchange pipe structure and the like. During the period, the high-temperature flue gas is cooled/recovered with waste heat and is hyperfine purified and filtered. The treated flue gas is switched by a gas recovery/flue gas diffusion switching valve and is diffused into the atmosphere through a diffusion chimney, a diffusion gas torch and a torch waste heat recovery device adopting a reinforced fin heat exchange tube structure.

3. Waste heat recovery

The system effectively recovers the full waste heat of the flue gas under the working states of converter oxygen-blowing smelting and non-oxygen-blowing smelting through devices such as a vaporization cooling flue, a membrane water-cooled wall combined type waste heat recovery device with independently replaceable heat pipes, a multistage combined flue gas waste heat recovery device with a reinforced fin heat exchange pipe structure, an explosion-venting overflow flue gas temperature adjusting/fire arrester, a torch waste heat recovery device with a reinforced fin heat exchange pipe structure, a waste heat recovery steam-water system and the like.

4. Effective treatment of overflow smoke dust generated during explosion venting of explosion venting valve

The dust-proof overflow type spring self-resetting explosion venting valve device arranged in the system automatically vents explosion when the system device is in an abnormal state, and the generated overflow smoke dust is treated by an explosion venting overflow smoke gas collecting and treating system smoke gas pipeline, an explosion venting overflow smoke gas temperature adjusting/fire retardant device, an explosion venting overflow smoke gas collecting and treating system jet flow induced draft device and the like and then is led into an explosion-proof type medium-temperature-resistant or high-temperature-resistant filter material ultralow-emission pulse blowing filter bag/filter cartridge type dust remover for purification and filtration treatment.

According to the technical scheme of the application:

1. a pure dry type dust removal process is adopted, so that the consumption of water and steam is 0%;

2. the device comprises a high-temperature phase change type heat accumulator, a gas burner, a water-cooled high-temperature valve, a gas burner blower, a water-cooled two-way/three-way reversing valve and the like, wherein the high-temperature phase change type heat accumulator, the gas burner, the water-cooled high-temperature valve, the gas burner blower, the water-cooled two-way/three-way reversing valve and the like are additionally arranged by adopting a micro-packaging process, and are switched between an oxygen blowing smelting working state and a non-oxygen blowing smelting working state of a converter, so that high-temperature smoke is continuously generated in a vaporization cooling flue, the problem of thermal expansion and cold contraction caused by rapid cooling and rapid heating of a vaporization cooling flue, a high-temperature pulse injection ceramic filter tube type dust removal device and a waste heat recovery device caused.

The high-temperature phase-change heat accumulator adopting the micro-packaging process has high heat storage density, can effectively realize the storage and the release of heat energy at the temperature of more than or equal to 800 ℃, and can realize the storage and the release of the heat energy basically constant within the set temperature access, thereby solving the contradiction that the supply and the demand of the heat energy are not matched in time and strength due to the particularity of the converter steelmaking process.

In addition, the high-temperature phase-change type heat storage device is arranged in the high-temperature pulse injection resistant ceramic filter tube type dust removal device, so that the storage and the release of heat energy of the high-temperature pulse injection resistant ceramic filter tube type dust removal device at the temperature of more than or equal to 800 ℃ can be effectively realized, the storage and the release of the heat energy can be basically constant in the set temperature access, and the impact of rapid cooling and rapid heating caused by the specificity of the converter steelmaking process on the ceramic filter tube of the high-temperature pulse injection resistant ceramic filter tube type dust removal device is solved.

Through adopting high temperature resistant pulse jetting ceramic filter tube formula dust collector, can effectively realize the hyperfine purification filtration processing of flue gas under the high temperature state, provide the advantage for follow-up high temperature flue gas waste heat recovery, not only be favorable to waste heat recovery device to improve waste heat recovery efficiency, also can effectively improve waste heat recovery device's operational reliability and stability, also can improve waste heat recovery life greatly and reduce maintenance, maintenance work load.

3. Through setting up dustproof excessive formula spring from restoring to throne and leaking out valve device, collection pipeline and corresponding follow-up processing apparatus etc. to leaking out and exploding excessive smoke and dust when valve is let out and explode and can effectively be retrieved and handle, prevent to let out to explode the secondary pollution problem that probably produces and take place.

4. The heat pipe and membrane water wall combined type waste heat recovery device which can be independently replaced is adopted to effectively cool high-temperature flue gas, and the primary flue gas waste heat of the converter is recovered to the maximum extent.

5. The anti-explosion ultra-low emission pulse bag-type dust collector is adopted to perform ultra-fine filtration treatment on the primary flue gas of the converter, so that the explosion venting problem caused by electrostatic dust collection power generation is thoroughly avoided, the safe and stable operation of the primary dust collection system of the converter is ensured, the stable recovery of clean dry gas and the stable emission of flue gas containing clean dry gas are realizedThe dust amount is stabilized to be less than or equal to 10mg/Nm³。

6. The corrosion problem of gas pipelines and equipment facilities is reduced to the maximum extent, and the smoke plume of the diffused smoke is thoroughly avoided.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Example 1

As shown in figure 1, the converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery comprises a vaporization cooling flue 1, a high temperature phase change type heat storage device 6, a high temperature resistant pulse blowing ceramic filter tube type dedusting device 7, a waste heat recovery system and an explosion venting and escaping flue gas collecting and processing system.

Before oxygen blowing smelting is carried out on the converter 1, a water-cooling three-way high-temperature reversing valve in the system acts to conduct connection between a high-temperature flue gas outlet of the vaporization cooling flue 3 and the high-temperature phase-change type heat storage device 6, and meanwhile, a water-cooling two-way high-temperature reversing valve in the system acts to conduct connection between a high-temperature flue gas outlet of the high-temperature phase-change type heat storage device 6 and a high-temperature pulse blowing ceramic filter tube dust removal device 7 of a built-in high-temperature phase-change type heat accumulator. During the oxygen blowing smelting work period of the converter, under the suction action of an axial flow fan, high-temperature flue gas generated by oxygen blowing of the converter passes through a vaporization cooling flue 3, a high-temperature flue gas pipeline, a high-temperature phase-change type heat storage device 6, a high-temperature pulse blowing ceramic filter tube dust removal device 7 of a built-in high-temperature phase-change type heat accumulator, a membrane water-cooled wall combined type waste heat recovery device 5 with a heat pipe capable of being replaced independently, a flue gas pipeline and a multistage combined flue gas waste heat recovery device 39 adopting a reinforced fin heat exchange tube structure, the high-temperature flue gas is cooled/subjected to waste heat recovery and hyperfine purification and filtration treatment, and meanwhile, the high-temperature phase-change type heat storage device 6 and the high-temperature pulse blowing ceramic filter.

The smoke of the front section and the rear section of the oxygen blowing smelting is switched by a gas recovery/smoke diffusion switching valve and is diffused into the atmosphere through a diffusion chimney, a diffusion gas torch and a torch waste heat recovery device 27 adopting a reinforced fin heat exchange tube structure.

Clean and dry coal gas in the middle stage of oxygen blowing smelting is switched by a coal gas recovery/flue gas diffusion switching valve, and the coal gas is collected into a coal gas cabinet through a coal gas recovery pipeline.

During the period that the converter 1 does not carry out oxygen blowing smelting, the water-cooling three-way high-temperature reversing valve in the system acts to respectively conduct the connection between the high-temperature flue gas outlet of the vaporization cooling flue 3 and the high-temperature pulse blowing ceramic filter tube dust removal device 7 of the built-in high-temperature phase change type heat accumulator and the connection between the high-temperature phase change type heat accumulation device 6 adopting the micro-packaging process and the gas burner, and meanwhile, the water-cooling two-way high-temperature reversing valve in the system acts to conduct the connection between the gas burner blower and the high-temperature phase change type heat accumulation device 6 adopting the micro-packaging process. During the non-oxygen blowing smelting work period of the converter, under the suction action of the axial flow fan, the gas burner utilizes the air blown by the blower of the gas burner to pass through the high-temperature phase-change type heat storage device for high-temperature preheating, and high-temperature flue gas generated by the gas CO sprayed into the gas burner and sprayed into the gas burner passes through the vaporization cooling flue 3, the high-temperature flue gas pipeline, the high-temperature pulse spraying ceramic filter tube dust removal device 7 with the built-in high-temperature phase-change type heat accumulator, the membrane water-cooled wall combined type waste heat recovery device 5 with the independently replaceable heat pipes, the flue gas pipeline, the multistage combined type flue gas waste heat recovery device with the reinforced fin heat exchange pipe structure. During the period, the high-temperature flue gas is cooled/recovered with waste heat and is hyperfine purified and filtered. The treated flue gas is switched by a gas recovery/flue gas diffusion switching valve and is diffused into the atmosphere through a diffusion chimney, a diffusion gas torch and a torch waste heat recovery device adopting a reinforced fin heat exchange tube structure.

The system effectively recovers the whole waste heat of the flue gas under the working states of converter oxygen-blowing smelting and non-oxygen-blowing smelting through devices such as a vaporization cooling flue 3, a membrane water-cooled wall combined type waste heat recovery device 5 with a replaceable heat pipe, a multi-stage combined flue gas waste heat recovery device 39 with a reinforced fin heat exchange pipe structure, a temperature adjusting/fire retardant device 17, a torch waste heat recovery device 27 with a reinforced fin heat exchange pipe structure and the like.

The dust-proof overflow type spring self-reset explosion venting valve device arranged in the system automatically vents explosion when the system device is in an abnormal state, and the generated overflow smoke dust is treated by a smoke pipeline of an explosion venting overflow smoke gas collecting and treating system, a smoke gas temperature adjusting/fire retardant device 17, a jet flow induced draft device 23 of the explosion venting overflow smoke gas collecting and treating system and the like and then is led into an anti-explosion type intermediate temperature resistant or high temperature resistant filter material ultralow-emission pulse blowing filter bag/filter cartridge type dust remover 24 for purification and filtration treatment.

Example 2

As shown in fig. 2, the high-temperature phase-change type heat storage device comprises a circular shell 2-4 and an ash bucket 2-9, wherein the shell comprises an upper box body 2-2 and a middle box body 2-8, a high-temperature phase-change heat storage core 2-5 is arranged in the middle box body 2-8, and the upper box body 2-2 is positioned at the upper part of the high-temperature phase-change heat storage core 2-5 in the middle box body 2-8; the middle box body 2-8 and the upper box body 2-2 can be opened so as to facilitate installation, replacement, maintenance and repair of the high-temperature phase change heat storage core 2-5 arranged in the middle box body; the ash buckets 2-9 are positioned below the middle box bodies 2-8;

the upper box body 2-2 is provided with a high-temperature flue gas outlet 2-1, the middle box body 2-8 or the ash bucket 2-9 is provided with a high-temperature flue gas inlet 2-15, the high-temperature flue gas inlet 2-15 is connected along the tangential direction of the circular shell, and is used for carrying out primary separation and sedimentation treatment on high-temperature dusty flue gas entering the dust remover together with a primary cyclone separation/airflow distribution device 2-16 for dusty flue gas arranged in the middle box body 2-8 or the ash bucket 2-9;

the straight pipe wall at the lower part of the dust-containing flue gas primary cyclone separation/air flow equipartition device 2-16 is provided with an air flow cavity (phi 20-30mm hole) with the aperture ratio of 40-50%;

the lower parts of the ash hoppers 2 to 9 are provided with a dust-removing pneumatic conveying transmitter device;

a honeycomb-shaped high-temperature phase change heat storage core is arranged in the middle box body through the high-temperature phase change heat storage core mounting fixing seat 2-17; the honeycomb-shaped tube bundle of the high-temperature phase-change heat storage core and the gap between the honeycomb-shaped tube bundle and the middle box body are high-temperature flue gas flowing channels; a gas shock wave soot blower is arranged in the upper box body and is used for blowing and cleaning high-temperature flue gas of a high-temperature phase-change heat storage core fixed in the middle box body through the wall of the channel cavity;

the bottom of the ash bucket is provided with 2-12 compressed nitrogen injection devices for fluidization, flame retardance and explosion prevention;

and the middle box body, the ash bucket and the high-temperature flue gas primary cyclone separation/airflow equipartition device are provided with 2-12 compressed nitrogen injection devices for flame retardance and explosion prevention in a vortex region.

The shell of the high-temperature phase-change heat storage device and the inner wall of the ash bucket are provided with a high-temperature resistant protective layer, and the outer wall of the shell is provided with a heat insulation cotton layer and a protective plate layer.

The shell of the high-temperature phase-change heat storage device, the high-temperature phase-change heat storage core mounting fixing seat, the dust-containing smoke primary cyclone separation/airflow sharing device and other internal components are made of high-temperature-resistant stainless steel materials.

According to the high-temperature phase-change type heat storage device suitable for the converter steelmaking dust removal system, the phase-change heat storage core is formed by filling phase-change heat storage materials into a honeycomb-shaped high-temperature phase-change heat storage device shell with a plurality of tube bundles, and then vacuumizing the high-temperature phase-change heat storage device through the air exhaust sealing head.

When the converter is in an oxygen blowing smelting working state, the temperature of the passing flue gas is highest, the flue gas volume is largest, the high-temperature flue gas enters the high-temperature phase-change heat storage device along the tangential direction of the box body through an inlet formed in the middle box body or the ash bucket, primary separation and purification are carried out on the high-temperature flue gas through the primary cyclone separation/air flow equal distribution device arranged at the inlet, then the high-temperature flue gas rises in the barrel and flows through the high-temperature phase-change heat storage core arranged in the high-temperature phase-change heat storage device, in a constant high-temperature section (namely 700-850 ℃), the high-temperature phase-change heat storage material filled in the high-temperature heat storage core is subjected to phase change to absorb a large amount of heat of the high-temperature flue gas in time.

When the converter is in a smelting working state without blowing oxygen, the temperature of the smoke passing through the converter is relatively low, the smoke volume is less, a large amount of heat is rapidly released to the smoke passing through the converter when the high-temperature phase change heat storage material is subjected to phase change in a constant high-temperature section (namely 700-850 ℃), the temperature of the passing smoke is increased, and the high-temperature smoke subjected to temperature increase flows out from a high-temperature smoke outlet arranged on a box body at the upper part of the high-temperature phase change heat storage device.

Example 3

As shown in fig. 3, the high-temperature constant-temperature pulse-blowing ceramic filter tube type dust removal device comprises a circular shell 2-11 and an ash bucket 2-4, wherein the shell 2-11 comprises a middle box body 2-21 and an upper box body 2-19 which is positioned above the middle box body 2-21 and is separated by a partition plate 2-20; the ash hoppers 2-4 are positioned below the middle box body; the upper box body is provided with a clean high-temperature flue gas outlet 2-18; a dust-containing high-temperature flue gas inlet 2-5 is arranged on the middle box body 2-21 or the ash hopper 2-4; the dusty high-temperature flue gas inlet 2-5 is connected along the tangential direction of the circular shell, and is used for carrying out primary separation and sedimentation treatment on the high-temperature dusty flue gas entering the dust remover together with a dusty flue gas primary cyclone separation/airflow distribution device 2-22 arranged in the middle box body or the ash bucket; the straight pipe wall at the lower part of the dust-containing flue gas primary cyclone separation/air flow equipartition device 2-22 is provided with an air flow cavity (phi 20-30mm hole) with the aperture ratio of 40-50%; the lower part of the ash bucket is provided with a pneumatic conveying transmitter 2-2 for dedusting ash; a square cavity or a round cavity or a honeycomb-shaped high-temperature phase change heat storage device 2-10 is arranged below the pattern plate in the middle box body; each square cavity or round cavity of the honeycomb shape of the high-temperature phase change heat storage device is internally provided with 2-12 ceramic filter tubes; the upper end part of each ceramic filter tube is opened, and the lower end part of each ceramic filter tube is sealed; the wall of the ceramic filter tube is provided with a plurality of micropores for fine filtration; the upper end part of the ceramic filter tube is fixed on the flower plate in a sealing way.

The membrane water wall combined type waste heat recovery device 5 capable of independently replacing the heat pipe is used for recovering waste heat and forms a high-pressure evaporator system with the high-pressure steam drum and a low-pressure evaporator system with the low-pressure steam drum respectively.

The high-pressure evaporator system is composed of a high-pressure steam drum, a downcomer, a heat pipe evaporator at the upper part of the membrane water wall combined type waste heat recovery device 5 with the heat pipes capable of being replaced independently, a membrane water wall evaporator at the upper part of the membrane water wall combined type waste heat recovery device 5 with the heat pipes capable of being replaced independently and an ascending pipe, and the high-pressure evaporator system has the main function of generating 1.8MPa saturated steam. Water in the high-pressure steam pocket enters the evaporation cooling flue evaporator through the descending pipe, absorbs heat of flue gas to form a steam-water mixture, enters the high-pressure steam pocket through the ascending pipe, is separated by the steam-water separator in the high-pressure steam pocket, and then steam is conveyed into the heat accumulator from the high-pressure steam pocket. The main function of the high pressure evaporator system is to generate 1.8MPa saturated steam. The heat pipe evaporator in the middle of the membrane water wall combined type waste heat recovery device 5 with the independently replaceable heat pipe forms an economizer, water from the water dividing header is heated to 170 ℃, and then the water is sent to a high-pressure steam pocket.

The low-pressure evaporator system comprises a low-pressure steam drum, a downcomer, a lower heat pipe evaporator of the membrane water wall combined type waste heat recovery device 5 with the independently replaceable heat pipes, a lower membrane water wall evaporator of the membrane water wall combined type waste heat recovery device 5 with the independently replaceable heat pipes, an ascending pipe and the like, and the low-pressure evaporator system mainly has the function of generating 0.4MPa saturated steam. Water in the low-pressure steam pocket enters each evaporator through a downcomer to absorb heat of flue gas to form a steam-water mixture, the steam-water mixture enters the low-pressure steam pocket through an ascending pipe, and generated low-pressure saturated steam is conveyed to a deaerator and used for heating and deaerating boiler water.

Example 4

As shown in fig. 4, the spring self-resetting explosion venting device for preventing explosion venting smoke dust from escaping comprises an explosion venting and escaping capturing cover shell 4-6 and a spring self-resetting valve plate assembly, wherein the shell comprises an escaping smoke gas outlet 4-14 arranged at the upper part of the explosion venting and escaping smoke gas capturing cover shell, and the escaping smoke gas outlet 4-14 is connected with a smoke gas pipeline 4-2 of an explosion venting and escaping smoke gas capturing and treating system; the lower part of the explosion venting and escaping trapping shell 4-6 (namely the lower part of the valve plate of the spring self-resetting valve plate assembly) is provided with an explosion venting flue gas inlet 4-15; the spring self-resetting valve plate assembly is fixed at the lower part of the inner cavity of the explosion venting and escaping trapping shell 4-6 through a valve plate guide rod 4-9; the spring self-resetting valve plate assembly valve plate 4-10 is sealed with the flange surface on the inner side of the lower part of the shell through a sealing ring; the spring self-resetting valve plate assembly is characterized in that a valve plate guide rod and a self-resetting spring set fixing frame 4-8 are arranged at the upper part of a valve plate guide rod 4-9; the self-reset spring set 4-7 is fixed on the valve plate guide rod and the self-reset spring set fixing frame 4-8, and the self-reset spring set 4-7 applies pressure to the valve plate in a downward balanced manner; the spring self-resetting explosion venting device capable of preventing explosion venting smoke dust from escaping is fixedly connected with the explosion venting flange of the process device through a lower flange thereof by a fastener set.

Example 5

As shown in fig. 5, the membrane wall combined type waste heat recovery device with the independently replaceable heat pipe comprises a round-square variable-diameter high-temperature flue gas upper box body 5-1, a plurality of sections of square waste heat recovery sections 5-2, a middle transition section 5-3 and an ash bucket 5-4, wherein the upper box body 5-1 is positioned above the waste heat recovery section 5-2; the intermediate transition section 5-3 is positioned between the adjacent waste heat recovery sections 5-2,

the upper box body 5-1 is provided with a high-temperature flue gas inlet 5-7, the upper box body 5-1 and each intermediate transition section 5-3 are respectively provided with an access hole door 5-8, and the access hole doors 5-8 are provided with a gas shock wave soot blowing device 5-5 for blowing and cleaning ash of the heat pipe; the shell of the waste heat recovery section 5-2 adopts a membrane water-cooled wall 5-6; the membrane water-cooled wall of the waste heat recovery section 5-2 is provided with an externally inserted heat pipe 5-9 which can be independently replaced; the heating surface of the heat pipe 5-9 which can be independently replaced adopts a supersonic speed electric arc spraying layer of heat-resistant, wear-resistant and corrosion-resistant special alloy coating. The externally inserted heat pipe 5-9 which can be replaced independently is fixed in an inserted sleeve arranged on the membrane water wall 5-6 of the waste heat recovery section 5-2 through a flange and a ceramic fiber bush welded on the heat pipe by fastening screws and gaskets;

the ash hopper 5-4 is positioned at the tail end of the waste heat recovery section, and a cooled flue gas outlet 5-11 is arranged at one side of the ash hopper 5-4 corresponding to the inlet of the waste heat recovery section 5-2; a set of barrier baffle plates 5-10 are arranged between the ash hopper 5-4 and the end section inlet of the waste heat recovery section 5-2 and the cooled flue gas outlet 5-11 and are used for effectively settling and filtering dust particles in the flue gas; the lower part of the ash bucket is provided with a dust-removing pneumatic conveying transmitter 5-13; 5-2 of each section of waste heat recovery is provided with a flame-retardant/explosion-proof compressed nitrogen injection device; and 5-12 compressed nitrogen blowing devices for fluidization, flame retardance and explosion prevention are arranged at the bottom 5-4 of the ash bucket.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery is characterized by comprising a vaporization cooling flue, a high temperature phase change type heat storage device, a high temperature pulse injection resistant ceramic filter tube type dedusting device, a waste heat recovery system and an explosion venting and escaping flue gas trapping and processing system,

2. The converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery as claimed in claim 1, wherein the high temperature phase change type heat storage device comprises a circular shell and an ash bucket, wherein the shell comprises an upper box body and a middle box body, a high temperature phase change heat storage core is arranged in the middle box body, the upper box body is positioned at the upper part of the middle box body, where the high temperature phase change heat storage core is arranged, and the ash bucket is positioned below the middle box body;

3. The converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery as claimed in claim 1, wherein the high temperature and constant temperature pulse blowing ceramic filter tube type dedusting device comprises a shell and an ash bucket, wherein the shell comprises an upper box body and a middle box body from top to bottom, the upper box body and the middle box body are separated by a partition plate, and the ash bucket is located below the middle box body;

4. The converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery as claimed in claim 1, wherein the explosion-proof system comprises a spring self-resetting explosion-proof device capable of preventing explosion-proof smoke from escaping, an explosion-proof overflow smoke collecting and processing system jet flow induced air device, and an explosion-proof overflow smoke temperature-adjusting flame arrester.

5. The converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery as claimed in claim 1, wherein the waste heat recovery system further comprises a multistage combined flue gas waste heat recovery device adopting a reinforced fin heat exchange tube structure.

6. The converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery as claimed in claim 1, wherein the converter primary pure dry dedusting system comprises a pulse blowing filter bag/filter cartridge type deduster.

7. The converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery as claimed in claim 1, wherein a high pressure steam pocket, a down pipe, a heat pipe evaporator at the upper part of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipes, a membrane water wall evaporator at the upper part of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipes and an up pipe form a high pressure evaporator system; the low-pressure evaporator system comprises a low-pressure steam drum, a downcomer, a lower heat pipe evaporator of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipes, a lower membrane water wall evaporator of the membrane water wall combined type waste heat recovery device with the independently replaceable heat pipes, an ascending pipe and the like.

8. The converter pure dry dedusting system integrating high temperature and constant temperature, high temperature purification and waste heat recovery as claimed in claim 1, wherein the waste heat recovery system comprises a torch waste heat recovery device adopting a reinforced fin heat exchange tube structure.