Steel rolling heating furnace ceramic fiber filter tube desulfurization, denitrification and dust removal collaborative treatment system

Abstract

The utility model discloses a steel rolling heating furnace ceramic fiber filter tube desulfurization, denitrification and dust removal collaborative treatment system. Comprising a heat exchanger (1), a dry desulfurization reactor (2), a dust and nitrate integrated device (5) and a waste heat utilization device (6), the inlet end of the dry desulfurization reactor (2) is connected with a desulfurization spraying device from the air classification grinding machine (13), and the outlet end of the dry desulfurization reactor (2) is connected with the ammonia spraying section (3); the ammonia spraying section (3) is connected with the protective agent spraying section (4); an outlet of the protective agent spraying section (4) is connected with the dust and nitrate integrated device (5); the dust and nitrate integrated device (5) comprises a dust hopper, a middle box body, an upper box body and a gas purification chamber; and a catalyst ceramic fiber filter tube is arranged in the middle box body and is arranged in different chambers. The system disclosed by the utility model belongs to a full-dry process, does not generate secondary pollution of waste water, is simple, is convenient to maintain and manage, needs few fixed staff, does not have a white smoke phenomenon, does not have an equipment corrosion problem, and does not need anti-corrosion treatment for the system and the chimney.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the atmospheric pollutant control technical field, concretely relates to steel rolling heating furnace ceramic fiber filter tube desulfurization and denitrification dust removal collaborative management system. BACKGROUND

[0002] The pollutants discharged by the steel rolling heating furnace are natural gas, blast furnace gas and the like, the flue gas generated after combustion has a smoke exhaust temperature of 350~400 DEG C after the flue gas heat exchanger, and the SO2, NO X Content is high, and the particle size of particulate matter is small, and the working condition fluctuation is big, and these pollutant emissions cause serious damage to the environment.

[0003] The flue gas denitrification mainly adopts the SCR denitrification process route, the desulfurization mainly adopts the calcium agent fixed bed, moving bed and SDS desulfurization, and the dust removal is mainly bag dust removal, and the process flow is long, the system and equipment configuration are complex, the land occupation is big, the system resistance is big, the energy consumption is high, and the failure rate is high.

[0004] The ceramic fiber filter tube has good temperature resistance, has the functions of collaborative denitrification and dust removal, has long service life, high denitrification and dust removal efficiency, low resistance (the total resistance of the equipment is less than 1200 pa) and low operation cost.

[0005] At present, China still lacks the particulate matter, SO2, NO X X collaborative management technology and equipment, and there is no application case of using the ceramic fiber filter tube for the desulfurization and denitrification dust removal collaborative management of the steel rolling heating furnace flue gas at home and abroad. SUMMARY

[0006] The utility model aims at providing the steel rolling heating furnace ceramic fiber filter tube desulfurization and denitrification dust removal collaborative management system to overcome the prior art deficiencies.

[0007] The utility model discloses a technical solution is: steel heating furnace ceramic fiber filter pipe desulfurization and denitrification dust removal collaborative management system, including dry desulfurization reactor, dust and nitre integration device, waste heat utilization device, dry desulfurization reactor import end connection air grading grinder, export end connection ammonia injection section, ammonia injection section export connection waste heat utilization device, protective agent injection section export connection dust and nitre integration device, the dust and nitre integration device includes ash bucket, middle box, upper box, clean gas chamber, the middle box is provided with catalyst ceramic fiber filter pipe, and the catalyst ceramic fiber filter pipe divides the compartment room arrangement, still be provided with the flower board, pressing device in the middle box, be equipped with flower board hole on the flower board, the number of flower board hole is consistent with the number of ceramic filter cartridge, one-to-one correspondence, the upper end of ceramic filter cartridge is open, and the upper end of ceramic filter cartridge and corresponding upper flower board hole are sealedly connected, be provided with the opening on the pressing device, and the number of opening is consistent with the number of catalyst ceramic fiber filter pipe, one-to-one correspondence, waste heat utilization device is connected chimney through induced draft fan.

[0008] Further, the air grading grinder is connected with the desulfurizer bin, and a metering and mixing device is arranged between the air grading grinder and the desulfurizer bin.

[0009] Further, the ammonia injection section is connected with the ammonia water station, and the protective agent injection section is connected with the protective agent bin.

[0010] Further, the inlet of the dry desulfurization reactor is connected with an induced draft fan system, and the induced draft fan system comprises a high-temperature induced draft fan and a cooling system.

[0011] Further, the ammonia injection section comprises an ammonia water tank, an ammonia water vaporizer, an ammonia water dilution fan, an ammonia water metering and mixing module, and a spraying device.

[0012] Further, the ash bucket is connected with a dust conveying system, and the dust conveying system is provided with a dust conveying bin pump, a collected dust bin, a dust conveying pipeline, and a dust conveying valve.

[0013] Further, the pressing device and the flower board are provided with an anti-shaking device, and a short pipe is additionally arranged between the pressing device and the flower board.

[0014] Further, the cylinder wall of the catalyst ceramic fiber filter pipe comprises a dust removal layer and a denitration layer from outside to inside; the dust removal layer is a ceramic fiber layer, and the denitration layer is a ceramic fiber layer attached with a denitration catalyst.

[0015] Further, the dry desulfurization reactor, the dust and nitre integration device, and the waste heat utilization device are connected with an electric control system.

[0016] Further, the electric control system is a DCS or PLC control system.

[0017] The waste heat utilization device is a waste heat recovery boiler.

[0018] The system is provided with two bypasses, the first bypass can bypass the catalytic ceramic fiber filter pipe dust and nitrogen integrated system and directly enter the waste heat recovery boiler, and the second bypass can directly enter the chimney through the induced draft fan when the waste heat recovery system is overhauled. The bypass system is only used temporarily when the two devices are damaged and overhauled in special cases, and the bypass is controlled by corresponding valves.

[0019] The working process includes the following steps:

[0020] The heat exchanger system cools the flue gas to the design temperature;

[0021] After cooling, the flue gas is sprayed into the desulfurizer in the pipeline for desulfurization;

[0022] After desulfurization, the flue gas is sprayed with ammonia in the pipeline;

[0023] After spraying ammonia, the flue gas enters the catalytic ceramic biological fiber filter pipe dust and nitrogen integrated system for denitrification and dust removal;

[0024] The treated flue gas is recovered for waste heat;

[0025] The ash conveying system collects and transports the dust removal ash;

[0026] The induced draft fan system introduces the flue gas after waste heat recovery into the chimney for discharge, the electric control system, the storage system and the chimney system.

[0027] The beneficial technical effects of the utility model are: short process desulfurization, denitrification and dust removal are realized, the equipment integration degree is high, the equipment volume is smaller under the same power, the system equipment quantity is reduced, the land occupation is saved, the equipment investment and operation cost are reduced, the biological soluble fiber ceramic filter pipe has good temperature resistance, high porosity, is not easy to block the hole, is easy to clean ash, has long service life and stable performance, the denitrification and dust removal efficiency is high, can be stably operated for a long period, is economic and efficient, reduces material consumption, has obvious advantages in energy saving and consumption reduction, and has remarkable environmental benefits; it belongs to a full dry process, no secondary pollution of waste water is generated, the system is simple, maintenance and management are convenient, the required personnel are few, there is no "white smoke" phenomenon, there is no equipment corrosion problem, and the system and the chimney do not need anticorrosion treatment and other advantages. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a structure diagram of a rolling steel heating furnace ceramic fiber filter pipe desulfurization, denitrification and dust removal collaborative management system.

[0029] In the figure: 1-heat exchanger, 2-dry desulfurization reactor, 3-ammonia spraying section, 4-protective agent spraying section, 5-dust and nitrogen integrated device, 6-waste heat utilization device, 7-induced draft fan, 8-chimney, 9-ammonia water station, 10-protective agent warehouse, 11-desulfurizer warehouse, 12-metering and mixing device, 13-air classification grinding machine. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in a variety of different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0033] like Figure 1 As shown, the steel rolling heating furnace ceramic fiber filter tube desulfurization, denitrification and dust removal coordinated treatment system includes a heat exchanger 1, a dry desulfurization reactor 2, a dust and nitrate integrated device 5, and a waste heat utilization device 6; the inlet end of the dry desulfurization reactor 2 is connected to the air classification grinder 13, and the outlet end is connected to the ammonia injection section 2; the ammonia injection section 3 is connected to the protective agent injection section 4, and the outlet of the protective agent injection section 4 is connected to the dust and nitrate integrated device 5; the dust and nitrate integrated device 5 includes an ash hopper, a middle box, an upper box, and a clean air chamber; a catalytic ceramic fiber is set in the middle box The filter tube, the catalytic ceramic fiber filter tube is arranged in a compartment, and a flower plate and a pressing device are also provided in the middle box body. The flower plate is provided with flower plate holes, and the number of the flower plate holes is consistent with the number of the ceramic filter cartridges, one-to-one corresponding; the upper end of the ceramic filter cartridge is open, and the upper end of the ceramic filter cartridge is sealed and connected to the corresponding upper flower plate holes; the pressing device is provided with openings, and the number of the openings is consistent with the number of the catalytic ceramic fiber filter tubes, one-to-one corresponding; the waste heat utilization device 6 is connected to the chimney 8 through the induced draft fan 7.

[0034] The air-classifying grinder 13 is connected to the desulfurizing agent bin 11 , and a metering and mixing device 12 is provided between the air-classifying grinder 13 and the desulfurizing agent bin 11 .

[0035] The ammonia spraying section 2 is connected to the ammonia water station 9 , and the protective agent spraying section 4 is connected to the protective agent warehouse 10 .

[0036] The outlet of the dust and saltpeter integrated device 5 is connected to the waste heat utilization device 6, and the induced draft fan system 7 includes a high-temperature induced draft fan and a cooling system.

[0037] The ammonia spraying section 2 comprises an ammonia water tank, an ammonia water vaporizer, an ammonia water dilution fan, an ammonia water metering mixing module and a spraying device.

[0038] The ash bucket is connected with an ash conveying system, and the ash conveying system is provided with an ash conveying bin pump, a collection ash bin, an ash conveying pipeline and ash valves.

[0039] The pressing device is provided with an anti-shaking device, and a short pipe is arranged between the pressing device and the flower plate.

[0040] The cylinder wall of the catalyst ceramic fiber filter tube comprises a dust removal layer and a denitration layer from outside to inside; the dust removal layer is composed of ceramic fibers, and the surface of the ceramic fibers is uniformly attached with a denitration catalyst; different catalyst formulations can be selected for different types of flue gas. The catalyst can be selected from low-temperature, medium-temperature and high-temperature catalysts, and the selection is made according to different flue gas characteristics and treatment efficiency, and the catalyst has a wide range of applications.

[0041] The dry desulfurization reactor 2, the dust and nitration integrated device 5 and the waste heat utilization device 6 are connected with an electric control system.

[0042] The electric control system is a DCS or PLC control system, and temperature, pressure, liquid level, flow, PH, oxygen content, concentration detection and CEMS signals in the system are connected with the DCS or PLC control system.

[0043] The ceramic fiber filter tube is arranged in a warehouse, and has an online maintenance function.

[0044] The desulfurizer supply system has a precise online adjustment function, can automatically and accurately control the injection amount of desulfurizer superfine powder in time according to the outlet SO2 emission concentration, and reduce the consumption under the premise of meeting the emission standard.

[0045] The ceramic fiber filter cartridge integrated dust remover needs to consider the displacement caused by temperature resistance and thermal expansion; the catalyst ceramic biological fiber filter tube dust and nitration integrated system is provided with a flower plate and a pressing device in the box; the flower plate is provided with a flower plate hole, and the number of the flower plate hole is consistent with the number of the ceramic filter cartridges; the upper end of the ceramic filter cartridge is open, and the upper end of the ceramic filter cartridge is sealingly connected with the corresponding upper flower plate hole; the pressing device is provided with an opening, and the number of the opening is consistent with the number of the ceramic filter cartridges; the pressing device and the flower plate are provided with anti-shaking measures, the sealing surface adopts flexible sealing, and the thermal expansion amount gap is left, and the short pipe is arranged to prevent the filter tube from being broken under the premise of ensuring sealing.

[0046] The system workflow includes the following steps: the flue gas of heating furnace is led out from the original flue, and the temperature is about 350-400℃. Considering the applicable temperature of sodium bicarbonate desulfurization, reducing equipment investment and waste heat utilization, etc., the temperature of flue gas is reduced to about 240℃ through heat exchanger; through the suction of induced draft fan, it enters the desulfurization, denitrification and dust removal collaborative treatment technology and equipment system of ceramic fiber filter pipe in steel rolling heating furnace. Before the inlet of catalyst ceramic biological fiber filter pipe dust and nitration integrated system, the superfine sodium bicarbonate powder ground by the mill is sprayed, and the desulfurization products and dust in the flue gas enter the catalyst ceramic biological fiber filter pipe dust and nitration integrated system for filtration, denitrification and dust removal. The purified flue gas collects waste heat through the waste heat recovery system and is discharged through the chimney after reaching the standard, and the desulfurization and denitrification products and dust are collected into the desulfurization ash bin and are transported for comprehensive utilization. The recovered heat source has obvious advantages in energy saving and consumption reduction, and the environmental protection and economic benefits are remarkable. After a period of operation, the inlet temperature of the dust and nitration integrated equipment can be increased to about 320℃ by adjusting the load of the heat exchanger to regenerate the catalyst ceramic biological fiber filter pipe, and the decomposition of ammonium sulfate and ammonium sulfate loaded on the fiber pipe can improve the denitrification efficiency of the fiber pipe and reduce the resistance of the dust and nitration integrated equipment. When the flue gas temperature of the steel rolling heating furnace is below the dew point due to starting the machine, low load and other reasons, the protective agent spraying device is automatically started to spray the protective agent (the protective agent can be lime) into the ceramic fiber filter pipe to protect the ceramic fiber filter pipe from damage caused by water in the flue gas, reduce the service life of the ceramic fiber filter pipe and cause pipe breakage and other problems.

[0047] Optionally, during the temperature rising process of the denitrification and dust removal system, to prevent condensate water from forming on the surface of the ceramic filter cartridge, the temperature rising speed cannot be lower than 5-10℃ / min when the system temperature is within 120℃, and the temperature rising speed can be according to the actual working condition when the temperature is above 120℃.

[0048] Optionally, ammonia can be sprayed into the system only when the temperature in the denitrification and dust removal device reaches 240℃, otherwise spraying ammonia is prohibited.

[0049] Optionally, the composition of the purified flue gas is monitored, and if the content of NOx is too high, the amount of ammonia sprayed should be gradually increased, and the data is monitored after the amount is increased each time and stabilized for 2 hours.

[0050] Optionally, the composition of the purified flue gas is monitored, and if the content of SO2 is too high, the amount of desulfurizing agent should be gradually increased, and the data is monitored after the amount is increased each time and stabilized for 1 hour. The primary requirement is that the content of SO2 should not be higher than 50 mg / Nm 3 .

[0051] Optionally, according to the running time or bin pressure, the back-blowing dust removal system is started in time, and the operation of each back-blowing pipe is checked one by one to meet the back-blowing control requirements.

[0052] Optionally, during normal operation of the system, temperature, pressure difference, back flushing pressure and flue gas data are recorded periodically. If there is a large change in flue gas temperature and pressure difference, corresponding adjustment should be made according to the operation requirements.

[0053] The system meets the current new environmental protection standards, and can remove SO2, NOx, dioxin, ultra-fine particle dust, HCL, HF and other pollutants in flue gas, has no waste water discharge, no chimney rain phenomenon in the flue gas discharge and other advantages. The process is simple, the land occupation is small, the high temperature resistance is good, the corrosion resistance is strong, the operation cost is low, the maintenance is simple, the service life is long, the economic and environmental benefits are obvious and other characteristics, which can replace the traditional filter bag dust removal.

[0054] The system can be used for new projects, and the system can be applied to the transformation of the original steel heating furnace desulfurization project, and the existing project is upgraded, the dynamic adjustment and control function is realized under the investment of less cost, the purpose of energy saving and reducing operation cost is realized.

[0055] The embodiments described above in combination with the drawings are only preferred embodiments of the utility model, the utility model is not limited to the specific details in the above-mentioned scheme, any modification, replacement made under the thought and principle of the utility model, is within the protection scope of the utility model.

Claims

1. The steel rolling heating furnace ceramic fiber filter tube desulfurization, denitrification and dust removal coordinated treatment system is characterized by The invention comprises a dry desulfurization reactor (2), a dust and saltpeter integrated device (5), and a waste heat utilization device (6); the inlet end of the dry desulfurization reactor (2) is connected to an air classification grinder (13), and the outlet end is connected to an ammonia injection section (3); the ammonia injection section (3) is connected to a protective agent injection section (4), and the outlet of the protective agent injection section (4) is connected to the dust and saltpeter integrated device (5); the dust and saltpeter integrated device (5) comprises an ash hopper, a middle box, an upper box, and a clean air chamber; a catalytic ceramic fiber filter tube is arranged in the middle box, and the catalytic ceramic fiber filter tube The compartments are arranged in sections, and a flower plate and a pressing device are further provided in the middle box body. The flower plate is provided with flower plate holes, and the number of the flower plate holes is consistent with the number of the catalytic ceramic fiber filter tubes, and corresponds one to one; the upper end of the catalytic ceramic fiber filter tube is open, and the upper end of the catalytic ceramic fiber filter tube is sealed and connected to the corresponding upper flower plate hole; the pressing device is provided with openings, and the number of the openings is consistent with the number of the catalytic ceramic fiber filter tubes, and corresponds one to one; the waste heat utilization device (6) is connected to the chimney (8) through the induced draft fan (7).

2. The steel rolling heating furnace ceramic fiber filter tube desulfurization, denitrification and dust removal coordinated treatment system according to claim 1 is characterized by: The air-classifying grinder (13) is connected to the desulfurizing agent bin (11), and a metering and mixing device (12) is provided between the air-classifying grinder (13) and the desulfurizing agent bin (11).

3. The steel rolling heating furnace ceramic fiber filter tube desulfurization, denitrification and dust removal coordinated treatment system according to claim 1 is characterized by: The ammonia spraying section (3) is connected to the ammonia water station (9), and the protective agent spraying section (4) is connected to the protective agent bin (10).

4. The steel rolling heating furnace ceramic fiber filter tube desulfurization, denitrification and dust removal coordinated treatment system according to claim 1 is characterized by: The inlet of the dry desulfurization reactor (2) is connected to the heat exchanger (1).

5. The steel rolling heating furnace ceramic fiber filter tube desulfurization, denitrification and dust removal coordinated treatment system according to claim 1 is characterized by: The ammonia spraying section (3) comprises an ammonia water tank, an ammonia water vaporizer, an ammonia water dilution fan, an ammonia water metering and mixing module, and a spray device.

6. The steel rolling heating furnace ceramic fiber filter tube desulfurization, denitrification and dust removal coordinated treatment system according to claim 1 is characterized by: The ash hopper is connected to the ash conveying system, and the ash conveying system is provided with an ash conveying bin pump, a collecting ash bin, an ash conveying pipeline, and an ash conveying valve.

7. The steel rolling heating furnace ceramic fiber filter tube desulfurization, denitrification and dust removal coordinated treatment system according to claim 1 is characterized by: Anti-swaying devices are provided on the pressing device and the flower plate, and a short tube is installed between the pressing device and the flower plate.

8. The steel rolling heating furnace ceramic fiber filter tube desulfurization, denitrification and dust removal coordinated treatment system according to claim 1 is characterized by: The cylinder wall of the catalytic ceramic fiber filter tube includes a dust removal layer and a denitration layer from the outside to the inside; the dust removal layer is a ceramic fiber layer, and the denitration layer is a ceramic fiber layer with a denitration catalyst attached.

9. The steel rolling heating furnace ceramic fiber filter tube desulfurization, denitrification and dust removal coordinated treatment system according to claim 1 is characterized by: The dry desulfurization reactor (2), the dust and saltpeter integrated device (5), and the waste heat utilization device (6) are connected to an electrical control system.

10. The steel rolling heating furnace ceramic fiber filter tube desulfurization, denitrification and dust removal coordinated treatment system according to claim 9 is characterized by: The electronic control system is a DCS or PLC control system.

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