A low-temperature wet electrostatic precipitator for ultra-clean fire tubes of converter flue gas

Abstract

An embodiment of the present invention relates to a super-clean fire tube low-temperature wet electrostatic precipitator for converter flue gas, comprising: a fire tube economizer, a heat exchanger, an ash baffle, and an explosion proofer, wherein the heat exchanger is located inside the fire tube economizer, the ash baffle is located at the bottom of the outer wall of the fire tube economizer, and the explosion proofer is located at the top of the outer wall of the fire tube economizer; a flocculation atomizing dust collector, an atomizing nozzle, and a dust collector, wherein the atomizing nozzle is located inside the flocculation atomizing dust collector, and the top of the dust collector is connected to the bottom end of the flocculation atomizing dust collector; a wet electrostatic precipitator, a liquid-solid separator, and an ash hopper, wherein the bottom end of the wet electrostatic precipitator is connected to the top end of the liquid-solid separator, and the bottom end of the liquid-solid separator is connected to the top end of the ash hopper; one end of the flocculation atomizing dust collector is connected to the ash baffle, and the other end of the flocculation atomizing dust collector is connected to one end of the wet electrostatic precipitator, and the other end of the wet electrostatic precipitator includes a flue gas outlet.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of industrial flue gas purification, and in particular to a low-temperature wet electrostatic precipitator for ultra-clean fire tubes of converter flue gas. Background Art

[0002] The converter steelmaking process, one of the most popular steelmaking processes in my country, generates a significant amount of converter flue gas. This flue gas contains high concentrations of CO. BOF flue gas (150-200°C) that meets recovery requirements (CO% > 35% and O2% < 2%) must be cooled to approximately 70°C before being recycled and stored in gasholders. Furthermore, to reduce dust content in the recovered flue gas and extend the life of the gasholders, cooling and dust removal are typically performed simultaneously.

[0003] Currently, the main dust removal methods used in converter processes include wet, semi-dry, and dry methods. However, existing dust removal technologies lack the ability to effectively recover and utilize the waste heat energy in converter flue gas. Furthermore, the cooling process consumes a large amount of water, and some water vapor enters the gas tank along with the recovered gas, significantly reducing its calorific value.

[0004] At present, there are few reports on the integrated technology of converter flue gas waste heat utilization and efficient dust removal. Therefore, it is urgently necessary to develop a low-temperature wet electrostatic precipitator for converter flue gas ultra-clean fire tubes, so as to achieve the goals of efficient recovery and utilization of converter flue gas waste heat and safe and efficient dust removal, and provide technical support for the converter process energy conservation and emission reduction goals. Summary of the Invention

[0005] In view of this, in order to solve the technical problems in the prior art, an embodiment of the present invention provides a low-temperature wet electrostatic precipitator for ultra-clean fire tubes of converter flue gas.

[0006] In a first aspect, an embodiment of the present invention provides a low-temperature wet electrostatic precipitator for ultra-clean fire tubes of converter flue gas, the device comprising: a flue gas heat exchange module, a flocculation dust removal module, and a wet electrostatic precipitator module;

[0007] The flue gas heat exchange module includes a fire tube economizer, a heat exchanger, an ash baffle, and an explosion preventer, wherein the heat exchanger is located inside the fire tube economizer, the ash baffle is located at the bottom of the outer wall of the fire tube economizer, and the explosion preventer is located at the top of the outer wall of the fire tube economizer;

[0008] The fire tube economizer includes a flue gas inlet, a water vapor outlet, and a circulating water inlet. The flue gas inlet and the water vapor outlet are located at the top of the fire tube economizer, and the circulating water inlet is located at the bottom of the fire tube economizer.

[0009] The flocculation dust removal module includes a flocculation atomizing dust collector, an atomizing nozzle, and a dust collector, wherein the atomizing nozzle is located inside the flocculation atomizing dust collector, and the top end of the dust collector is connected to the bottom end of the flocculation atomizing dust collector;

[0010] The flocculation atomizing dust collector comprises a spray water inlet, and the spray water inlet is located at the top of the flocculation atomizing dust collector;

[0011] The wet electrostatic precipitator module includes a wet electrostatic precipitator, a liquid-solid separator, and an ash hopper, wherein the bottom end of the wet electrostatic precipitator is connected to the top end of the liquid-solid separator, and the bottom end of the liquid-solid separator is connected to the top end of the ash hopper;

[0012] One end of the flocculation atomizing dust collector is connected to the dust baffle, and the other end of the flocculation atomizing dust collector is connected to one end of the wet electrostatic precipitator, and the other end of the wet electrostatic precipitator includes a flue gas outlet.

[0013] In a possible embodiment, the heat exchanger includes one of the following: an internal fin heat exchanger, an internal threaded tube heat exchanger, so as to perform gas-liquid two-phase flow heat exchange.

[0014] In a possible embodiment, the heat exchanger is arranged in a downstream manner inside the fire tube economizer.

[0015] In a possible implementation, the dust shield includes a louvered dust shield.

[0016] In one possible implementation, the flue gas heat exchange module includes two explosion preventers symmetrically distributed on the top of the outer wall of the fire tube economizer.

[0017] In one possible embodiment, the flue gas inlet is located at the center of the top of the fire tube economizer, the water vapor outlet is located at the right edge of the top of the fire tube economizer, and the circulating water inlet is located at the left edge of the bottom of the fire tube economizer.

[0018] In a possible implementation manner, the ash baffle is located at the right edge of the bottom of the outer wall of the fire tube economizer.

[0019] In one possible embodiment, the fire tube economizer, flocculation atomizing dust collector and wet electrostatic precipitator are coupled to achieve waste heat utilization and low-temperature and high-efficiency dust removal.

[0020] In a possible implementation manner, the spray water inlet is located at the top center of the flocculation atomizing dust collector.

[0021] The embodiment of the present invention provides a super-clean fire tube low-temperature wet electrostatic precipitator for converter flue gas. The fire tube economizer is used to achieve safe and efficient recovery and utilization of converter flue gas waste heat, reduce converter flue gas temperature (50°C-80°C), and efficiently couple with subsequent flue gas dust removal processes. At the same time, flocculation atomization dust removal has the advantages of high dust removal efficiency, water conservation, and low cost; the low-temperature wet electrostatic precipitator has the advantages of high dust removal efficiency, simple and safe operation, water recycling, and low maintenance costs. The present invention integrates waste heat recovery and utilization with high-efficiency dust removal technology, improves the overall stability of the equipment and the flexibility of parameter adjustment, and extends the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 This is a schematic diagram of the overall structure of a low-temperature wet electrostatic precipitator for ultra-clean fire tubes of converter flue gas according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0025] To facilitate understanding of the embodiments of the present invention, specific embodiments will be further explained below with reference to the accompanying drawings. The embodiments do not limit the embodiments of the present invention.

[0026] like Figure 1 As shown, a low-temperature wet electrostatic precipitator device for converter flue gas ultra-clean fire tubes provided by an embodiment of the present invention may include: a flue gas heat exchange module, a flocculation dust removal module and a wet electrostatic precipitator module.

[0027] The flue gas heat exchange module includes a fire tube economizer 1 , a heat exchanger 2 , an ash baffle 3 , and an explosion-proof device 4 .

[0028] The heat exchanger 2 is located inside the fire tube economizer 1 , the ash baffle 3 is located at the bottom of the outer wall of the fire tube economizer 1 , and the explosion-proof device 4 is located at the top of the outer wall of the fire tube economizer 1 .

[0029] The heat exchanger 2 is arranged in a downstream manner inside the fire tube economizer to minimize the water flow resistance along the way and reduce the converter flue gas temperature (150°C-200°C) to 50°C-80°C.

[0030] The heat exchanger 2 may include one of the following: an internal fin heat exchanger or an internal threaded tube heat exchanger to perform gas-liquid two-phase heat exchange. The internal fin heat exchanger or internal threaded tube structure can increase the heat exchange area.

[0031] In addition, the fire tube economizer 1 includes a flue gas inlet, a water vapor outlet, and a circulating water inlet. The flue gas inlet and the water vapor outlet are located at the top of the fire tube economizer, and the circulating water inlet is located at the bottom of the fire tube economizer.

[0032] Preferably, the flue gas inlet is located at the center of the top of the fire tube economizer, the water vapor outlet is located at the right edge of the top of the fire tube economizer, and the circulating water inlet is located at the left edge of the bottom of the fire tube economizer.

[0033] Furthermore, the device may also include two explosion-proof devices 4, which are symmetrically distributed on the top of the outer wall of the fire tube economizer, to detect the internal pressure of the flue in real time online and achieve rapid pressure relief to ensure equipment operation and personnel safety.

[0034] The ash baffle 3 includes a louvered ash baffle. Preferably, the ash baffle 3 is located at the right edge of the bottom of the outer wall of the fire tube economizer.

[0035] The flocculation dust removal module includes a flocculation atomizing dust collector 5 , an atomizing nozzle 6 , and a dust collector 7 .

[0036] The atomizing nozzle 6 is located inside the flocculation atomizing dust collector 5, and the top of the dust collector 7 is connected to the bottom of the flocculation atomizing dust collector 5. The atomizing nozzle 6 performs atomization and flocculation dust removal, which can effectively condense and settle the dust.

[0037] The flocculation atomizing dust collector 5 includes a spray water inlet, which is located at the top of the flocculation atomizing dust collector 5. Preferably, the spray water inlet is located at the center of the top of the flocculation atomizing dust collector 5.

[0038] Inside the flocculation atomizing dust collector 5, the atomizing nozzle 6 is used to perform water atomization flocculation dust removal, and the flocculant and water are configured in proportion.

[0039] The wet electrostatic precipitator module includes a wet electrostatic precipitator 8 , a liquid-solid separator 9 , and an ash hopper 10 .

[0040] The bottom end of the wet electrostatic precipitator 8 is connected to the top end of the liquid-solid separator 9, and the bottom end of the liquid-solid separator 9 is connected to the top end of the ash hopper 10. The liquid-solid separator 9 is used at the bottom end of the wet electrostatic precipitator 4 to achieve efficient separation of water and dust and realize water recycling.

[0041] The fire tube economizer 1, the flocculation atomizing dust collector 5 and the wet electrostatic precipitator 8 are coupled to realize waste heat utilization and low-temperature and high-efficiency dust removal: one end of the flocculation atomizing dust collector 5 is connected to the ash baffle 3, and the other end of the flocculation atomizing dust collector 5 is connected to one end of the wet electrostatic precipitator 8, and the other end of the wet electrostatic precipitator 8 includes a flue gas outlet.

[0042] The working process of the ultra-clean fire tube low-temperature wet electrostatic precipitator for converter flue gas in the embodiment of the present invention is as follows: the converter flue gas (150℃-200℃) first enters the fire tube economizer 1, and at the same time, circulating water flows from the bottom of the fire tube economizer 1 into the inner finned heat exchange tube 2 to exchange heat with the converter flue gas and reduce the converter flue gas temperature to 50℃-80℃. The converter flue gas passes through the louvered ash baffle 3 for coarse dust removal. At the same time, the explosion-proof device 4 is installed at the top of the fire tube heat exchanger 1 to detect the internal pressure of the flue in real time online. And realize rapid upward pressure relief to ensure equipment operation and personnel safety; the low-temperature converter flue gas after heat exchange enters the flocculation atomizing dust collector 5, is subjected to atomization and flocculation dust removal through the atomizing nozzle 6, and is collected by the dust collector 7; the converter flue gas finally enters the wet electrostatic precipitator 8, is subjected to water mist-type low-temperature and high-efficiency fine dust removal, and water and dust are separated by the liquid-solid separator 9, and the dust falls into the ash hopper 10 for collection and treatment. After dust removal, the converter flue gas can meet the ultra-clean emission standard (<5-10mg / m3).

[0043] Through the above description of the ultra-clean fire tube low-temperature wet electrostatic precipitator for converter flue gas provided by the embodiment of the present invention, the use of a fire tube economizer can achieve safe and efficient recovery and utilization of converter flue gas waste heat, reduce the converter flue gas temperature (50°C-80°C), and efficiently couple the subsequent flue gas dust removal process. At the same time, flocculation atomization dust removal has the advantages of high-efficiency dust removal, water conservation, and low cost; the low-temperature wet electrostatic precipitator has the advantages of high dust removal efficiency, simple and safe operation, water recycling, and low maintenance costs. The present invention integrates waste heat recovery and utilization with high-efficiency dust removal technology, improves the overall stability of the equipment and the flexibility of parameter adjustment, and extends the service life of the equipment.

[0044] Professionals should also be further aware that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0045] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0046] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low-temperature wet electrostatic precipitator for ultra-clean fire tubes of converter flue gas, characterized in that: The device includes: a flue gas heat exchange module, a flocculation dust removal module and a wet electrostatic precipitator module; The flue gas heat exchange module includes a fire tube economizer, a heat exchanger, an ash baffle, and an explosion preventer, wherein the heat exchanger is located inside the fire tube economizer, the ash baffle is located at the bottom of the outer wall of the fire tube economizer, and the explosion preventer is located at the top of the outer wall of the fire tube economizer; The fire tube economizer includes a flue gas inlet, a water vapor outlet, and a circulating water inlet. The flue gas inlet and the water vapor outlet are located at the top of the fire tube economizer, and the circulating water inlet is located at the bottom of the fire tube economizer. The fire tube economizer is used to reduce the temperature of the converter flue gas from 150°C to 200°C to 50°C to 80°C. The flocculation dust removal module includes a flocculation atomizing dust collector, an atomizing nozzle, and a dust collector, wherein the atomizing nozzle is located inside the flocculation atomizing dust collector, and the top end of the dust collector is connected to the bottom end of the flocculation atomizing dust collector; The flocculation atomizing dust collector includes a spray water inlet, which is located at the top of the flocculation atomizing dust collector. Inside the flocculation atomizing dust collector, the atomizing nozzle is used to perform water atomization flocculation dust removal, and the flocculant and water are configured in proportion; The wet electrostatic precipitator module includes a wet electrostatic precipitator, a liquid-solid separator, and an ash hopper, wherein the bottom end of the wet electrostatic precipitator is connected to the top end of the liquid-solid separator, and the bottom end of the liquid-solid separator is connected to the top end of the ash hopper; The fire tube economizer, flocculation atomizing dust collector and wet electrostatic precipitator are coupled to realize waste heat utilization and low-temperature and high-efficiency dust removal; One end of the flocculation atomizing dust collector is connected to the dust baffle, and the other end of the flocculation atomizing dust collector is connected to one end of the wet electrostatic precipitator, and the other end of the wet electrostatic precipitator includes a flue gas outlet.

2. The device according to claim 1, characterized in that The heat exchanger includes one of the following: an internal fin heat exchanger and an internal threaded tube heat exchanger to perform gas-liquid two-phase flow heat exchange.

3. The device according to claim 1, characterized in that The heat exchanger is arranged in a downstream manner inside the fire tube economizer.

4. The device according to claim 1, characterized in that The dust shield includes a louver-type dust shield.

5. The device according to claim 1, characterized in that The flue gas heat exchange module includes two explosion-proof devices, which are symmetrically distributed on the top of the outer wall of the fire tube economizer.

6. The device according to claim 1, characterized in that The flue gas inlet is located at the center of the top of the fire tube economizer, the water vapor outlet is located at the right edge of the top of the fire tube economizer, and the circulating water inlet is located at the left edge of the bottom of the fire tube economizer.

7. The device according to claim 6, characterized in that The ash baffle is located at the right edge of the bottom of the outer wall of the fire tube economizer.

8. The device according to claim 1, characterized in that The spray water inlet is located at the top center of the flocculation atomizing dust collector.

Images