Kiln high-temperature oxygen circulation and heat energy utilization device

Abstract

The utility model relates to the field of tail gas treatment, and discloses a kiln high-temperature oxygen circulation and heat energy utilization device which comprises a kiln, ceramic filter cartridge high-temperature dust remover groups, a multi-stage tubular heat exchanger, an induced draft fan, an oxygen compressor, a Co2 adsorption device and a valve group, the multi-stage tubular heat exchanger on one side of the ceramic filter cartridge high-temperature dust remover comprises a first-stage tubular heat exchanger and a second-stage tubular heat exchanger which are connected with each other, a cold source medium inlet of the multi-stage tubular heat exchanger is connected with the valve group, and the Co2 adsorption device comprises a Co2 adsorption tank A, a Co2 adsorption tank B and a control valve. High-temperature flue gas is purified through dust removal purification, heat exchange cooling, oxygen pressurization, the pressure swing adsorption device and the pressure regulating valve set and then recycled, through multi-stage gas-gas heat exchange, the temperature of the high-temperature flue gas can be lowered, heat of kiln flue gas can be converted into oxygen entering the kiln to the maximum extent, the conversion rate is high, and energy can be saved.

Description

Technical Field

[0001] The utility model relates to the field of tail gas treatment, in particular to a furnace high-temperature oxygen circulation and heat energy utilization device. Background Art

[0002] After the existing kiln flue gas comes out of the kiln, it is cooled by mixing with cold air and then discharged through the chimney. 95% of the oxygen in the flue gas is wasted, and a large amount of heat contained in the 750℃ flue gas is also wasted.

[0003] Acid corrosion occurred in the flue gas duct after the high-temperature flue gas was mixed with cold air. The reason for this is that the inhaled cold air has high humidity and contains a large amount of water vapor, and the kiln flue gas also contains some water vapor. When the two flue gases with different temperatures and both containing water vapor are mixed, turbulence is generated, causing some water to seep out, and the CL ions and lithium in the flue gas are dissolved in it, causing corrosion to the pipe wall.

[0004] In the document CN201710197309, a flue gas treatment system for purifying furnace flue gas and recovering flue gas waste heat is disclosed, including a furnace, a heat exchanger and a flue gas separator connected in sequence by pipelines; the heat exchanger includes a cylinder and a tube core arranged inside the cylinder, the tube core includes a spiral fluoroplastic threaded tube, and a first tube sheet and a second tube sheet arranged at both ends of the fluoroplastic threaded tube; the fluoroplastic threaded tube is provided with an air inlet channel and an air outlet channel, and the flue gas channel is between the adjacent fluoroplastic threaded cavity plates; the flue gas separator includes an upper cylinder and a lower cylinder. This structure is easy to cause corrosion to the tube wall during the purification process, resulting in a shortened service life of the device.

[0005] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the invention

[0006] In order to solve the above problems, the utility model discloses a furnace high-temperature oxygen circulation and heat energy utilization device. The high-temperature flue gas is recycled after being purified through dust removal and purification, heat exchange and cooling, oxygen pressurization, a pressure swing adsorption device, and a pressure regulating valve group. Through multi-stage gas-to-gas heat exchange, not only the high-temperature flue gas temperature can be lowered, but also the heat of the kiln flue gas can be converted into the oxygen entering the kiln to the maximum extent. The conversion rate is high and energy can be saved.

[0007] The technical solution of the utility model is: a furnace high-temperature oxygen circulation and heat energy utilization device, including a furnace, a ceramic filter cartridge high-temperature dust collector group, a multi-stage tubular heat exchanger, an induced draft fan, an oxygen compressor, a Co2 adsorption device and a valve group, the ceramic filter cartridge high-temperature dust collector group is connected in parallel, the multi-stage tubular heat exchanger on one side of the ceramic filter cartridge high-temperature dust collector includes a first-stage tubular heat exchanger and a second-stage tubular heat exchanger connected to each other, the cold source medium inlet of the multi-stage tubular heat exchanger is connected to the valve group, and the Co2 adsorption device includes a Co2 adsorption tank A, a Co2 adsorption tank B and a control valve.

[0008] Preferably, the air inlet of the ceramic filter cartridge high temperature dust collector group on one side of the furnace is connected, and the ceramic filter cartridge high temperature dust collector group includes two parallel ceramic filter cartridge high temperature dust collectors, the inlets and outlets of the ceramic filter cartridge high temperature dust collectors are connected, and the outlet is connected to the multi-stage tubular heat exchanger.

[0009] By adopting the above technical solution, the high-temperature kiln flue gas first enters the high-temperature ceramic fiber cartridge dust collector for fine dust removal to remove lithium salts, CL salts and dust in the flue gas, thereby preventing the corrosion of the pipe wall and equipment by water vapor at low temperatures.

[0010] Preferably, the multi-stage tubular heat exchanger includes a primary tubular heat exchanger and a secondary tubular heat exchanger, the inlet on one side of the primary tubular heat exchanger is connected to the outlet of the ceramic filter cartridge high-temperature dust collector group, and the outlet of the heat source medium after heat exchange at the top of the primary tubular heat exchanger is connected to the furnace.

[0011] By adopting the above technical solution, the filtered flue gas enters the primary tubular heat exchanger and the secondary tubular heat exchanger for heat exchange and cooling, and the heat is replaced by the low-temperature oxygen entering the kiln.

[0012] Preferably, the outlet of the primary tubular heat exchanger is connected to the inlet of the secondary tubular heat exchanger, the outlet of the secondary tubular heat exchanger is connected to the induced draft fan, and the heat source medium outlet of the secondary tubular heat exchanger is connected to the furnace.

[0013] By adopting the above technical solution, the induced draft fan transfers the medium-temperature flue gas finally transferred from the multi-stage tubular heat exchanger to the oxygen compressor and is detected by the oxygen content analyzer.

[0014] Preferably, the induced draft fan is connected to the oxygen compressor, and an oxygen content analyzer and a vent valve are also connected between the induced draft fan and the oxygen compressor.

[0015] By adopting the above technical solution, the oxygen content in the flue gas after cooling is analyzed by an oxygen content analyzer: a. If the oxygen content is lower than the use requirement, it is released; b. If the oxygen content is higher than the use requirement, it is recycled. The flue gas entering the recycling is pressurized by an oxygen compressor, and then passes through a CO2 adsorption device to remove impurities such as CO2, N2, and water vapor in the flue gas.

[0016] Preferably, the oxygen compressor and the air intake control valve A and the air intake control valve B of the Co2 adsorption device are connected, and the air intake control valve A and the air intake control valve B are connected to one side of the Co2 adsorption tank A and one side of the Co2 adsorption tank B respectively.

[0017] By adopting the above technical solution, the oxygen compressor transports the flue gas to the Co2 adsorption tank A and the Co2 adsorption tank B through the intake control valve A and the intake control valve B.

[0018] Preferably, the other side of Co2 adsorption tank A and the other side of Co2 adsorption tank B are connected to gas outlet control valve A and gas outlet control valve B respectively, gas outlet control valve A and gas outlet control valve B are both connected to the buffer tank, and exhaust control valve A and exhaust control valve B are respectively provided on the top of Co2 adsorption tank A and Co2 adsorption tank B.

[0019] By adopting the above technical scheme, when Co2 adsorption tank A adsorbs Co2, N2, water vapor and the like in the flue gas, pure oxygen with qualified purity is discharged through the gas outlet control valve A; at this time, Co2 adsorption tank B performs heating and decomposition, and the Co2, N2 and water vapor adsorbed on the adsorbent are decomposed by heating the adsorbent, and the inlet / outlet control valve B is closed, and the Co2 adsorption tanks A and B adsorb and decompose alternately and are used in a cycle.

[0020] Preferably, the buffer tank and the pressure reducing valve group are connected via the valve group and the multi-stage tubular heat exchanger, and the pressure reducing valve group is connected to the oxygen supply main pipe.

[0021] By adopting the above technical solution, the purified flue gas becomes pure oxygen, which enters the buffer tank, is supplemented with the required oxygen through the oxygen supply main pipe and the pressure reducing valve group, and then enters the multi-stage gas-to-gas heat exchanger through the pressure regulating valve group to raise the oxygen temperature to 550-600℃ before entering the kiln for use.

[0022] Preferably, the valve group includes two parallel-connected pressure regulating valve groups.

[0023] The benefits of the utility model are as follows: 1. The utility model allows the flue gas to enter the ceramic filter cartridge high-temperature dust collector before entering the heat exchanger, so that lithium salts, CL salts and dust in the flue gas can be removed first, avoiding corrosion of the pipe wall and equipment by water vapor at low temperatures.

[0024] 2. The utility model uses a multi-stage tubular heat exchanger to exchange heat, which can not only reduce the temperature of high-temperature flue gas, but also convert the heat of kiln flue gas to the oxygen entering the kiln to the maximum extent, with a high conversion rate and can save energy.

[0025] 3. The high-temperature flue gas of the utility model is recycled after being purified through dust removal, heat exchange and cooling, oxygen pressurization, pressure swing adsorption device and pressure regulating valve group, which can reduce the waste of resources and make the resources recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the utility model;

[0027] Figure 2 It is a structural schematic diagram of the multi-stage tubular heat exchanger of the utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the Co2 adsorption device of the utility model;

[0029] Figure 4 It is a structural schematic diagram of the pressure regulating valve group of the utility model.

[0030] Among them: 1. Furnace, 2. Ceramic filter cartridge high-temperature dust collector, 3. Multi-stage tubular heat exchanger, 3-1. First-stage tubular heat exchanger, 3-2. Second-stage tubular heat exchanger, 4. Induced draft fan, 5. Oxygen content analyzer, 6. Oxygen compressor, 7. Co2 adsorption device, 7-1. Co2 adsorption tank A, 7-11. Air intake control valve A, 7-12. Air outlet control valve A, 7-13. Exhaust control valve A, 7-2. Co2 adsorption tank B, 7-21. Air intake control valve B, 7-22. Air outlet control valve B, 7-23. Exhaust control valve B, 8. Buffer tank, 9. Pressure regulating valve group, 10. Pressure reducing valve group, 11. Oxygen supply main pipe, 12. Vent valve, 13. Adsorbent. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] like Figure 1-4 As shown, a furnace high-temperature oxygen circulation and heat energy utilization device includes a furnace 1, a ceramic filter cartridge high-temperature dust collector group, a multi-stage tubular heat exchanger 3, an induced draft fan 4, an oxygen compressor 6, a Co2 adsorption device 7 and a valve group. The ceramic filter cartridge high-temperature dust collector group is connected in parallel, and the multi-stage tubular heat exchanger 3 on one side of the ceramic filter cartridge high-temperature dust collector 2 includes a first-stage tubular heat exchanger 3-1 and a second-stage tubular heat exchanger 3-2 that are connected to each other. The cold source medium inlet of the multi-stage tubular heat exchanger 3 is connected to the valve group, and the Co2 adsorption device 7 includes a Co2 adsorption tank A7-1, a Co2 adsorption tank B7-2 and a control valve.

[0033] The air inlet of the ceramic filter cartridge high temperature dust collector group on one side of the kiln 1 is connected. The ceramic filter cartridge high temperature dust collector group includes two parallel ceramic filter cartridge high temperature dust collectors 2. The inlets and outlets of the ceramic filter cartridge high temperature dust collectors 2 are connected, and the outlets are connected to the multi-stage tubular heat exchanger 3. The high-temperature kiln flue gas first enters the high-temperature ceramic fiber filter cartridge dust collector 2 for fine dust removal to remove lithium salts, CL salts and dust in the flue gas to avoid corrosion of the pipe wall and equipment by water vapor at low temperatures.

[0034] The multi-stage tubular heat exchanger 3 includes a primary tubular heat exchanger 3-1 and a secondary tubular heat exchanger 3-2. The inlet on one side of the primary tubular heat exchanger 3-1 is connected to the outlet of the ceramic filter cartridge high-temperature dust collector group. The outlet of the heat source medium after heat exchange at the top of the primary tubular heat exchanger 3 is connected to the furnace 1. The filtered flue gas enters the primary tubular heat exchanger 3-1 and the secondary tubular heat exchanger 3-2 for heat exchange and cooling, and the heat is replaced by the low-temperature oxygen entering the furnace 1.

[0035] The outlet of the first-stage tubular heat exchanger 3-1 is connected to the inlet of the second-stage tubular heat exchanger 3-2, the outlet of the second-stage tubular heat exchanger 3-2 is connected to the induced draft fan 4, the heat source medium outlet of the second-stage tubular heat exchanger 3-2 is connected to the furnace 1, and the induced draft fan 4 transfers the medium-temperature flue gas finally transferred from the multi-stage tubular heat exchanger 3 to the oxygen compressor 6 for detection by the oxygen content analyzer 5.

[0036] The induced draft fan 4 is connected to the oxygen compressor 6, and an oxygen content analyzer 6 and a vent valve 12 are also connected between the induced draft fan 4 and the oxygen compressor 6. After cooling, the flue gas passes through the oxygen content analyzer 5 to analyze the oxygen content in the flue gas: a. If the oxygen content is lower than the use requirement, it is released; b. If the oxygen content is higher than the use requirement, it is recycled. The flue gas entering the recycling is pressurized by the oxygen compressor 6, and then passes through the Co2 adsorption device to remove impurities such as Co2, N2, and water vapor in the flue gas.

[0037] The oxygen compressor 6 and the air intake control valve A7-11 and the air intake control valve B7-21 of the Co2 adsorption device 7 are connected. The air intake control valve A7-11 and the air intake control valve B7-21 are respectively connected to one side of the Co2 adsorption tank A7-1 and one side of the Co2 adsorption tank B7-2. The oxygen compressor 6 transports the flue gas to the Co2 adsorption tank A7-1 and the Co2 adsorption tank B7-2 through the air intake control valve A7-11 and the air intake control valve B7-21. Both the Co2 adsorption tank A7-1 and the Co2 adsorption tank B7-2 are provided with adsorbent 13.

[0038] The other side of the Co2 adsorption tank A7-1 and the other side of the Co2 adsorption tank B7-2 are connected to the gas outlet control valve A7-12 and the gas outlet control valve B7-22 respectively. The gas outlet control valve A7-12 and the gas outlet control valve B7-22 are both connected to the buffer tank 8. The tops of the Co2 adsorption tanks A7-1 and B7-2 are respectively provided with exhaust control valves A7-13 and exhaust control valves B. When the Co2 adsorption tank A7-1 adsorbs Co2, N2, water vapor, etc. in the flue gas, pure oxygen with qualified purity is discharged through the gas outlet control valve A7-12; at this time, the Co2 adsorption tank B7-2 is heated and analyzed, and the Co2, N2, and water vapor adsorbed on the adsorbent are analyzed by heating, and the inlet / outlet control valve B is closed. The Co2 adsorption tanks A and B adsorb and analyze alternately and are used in a cycle.

[0039] The buffer tank 8 and the pressure reducing valve group 10 are connected via a valve group and a multi-stage tubular heat exchanger. The valve group includes two parallel pressure regulating valve groups 9. The pressure reducing valve group is connected to the oxygen supply main pipe 11. The purified flue gas is pure oxygen, which enters the buffer tank 8. After the required oxygen is supplemented through the oxygen supply main pipe 11 and the pressure reducing valve group 10, it enters the multi-stage gas-to-gas heat exchanger 3 through the pressure regulating valve group 9, raises the oxygen temperature to 550-600°C, and enters the kiln 1 for use.

[0040] Working principle: The high-temperature kiln flue gas in the kiln 1 first enters the high-temperature ceramic fiber filter cartridge dust collector 2 for fine dust removal to remove lithium salts, CL salts and dust in the flue gas to avoid corrosion of the pipe wall and equipment by water vapor at low temperature. After filtration, the ultra-high temperature kiln flue gas enters the first-stage tubular heat exchanger 3-1, and the ultra-high temperature flue gas becomes high-temperature flue gas. Then the high-temperature flue gas coming out of the first-stage tubular heat exchanger 3-1 enters the second-stage tubular heat exchanger 3-2, and then the high-temperature flue gas becomes medium-temperature flue gas through the induced draft fan 4 and enters the oxygen compressor 6. During this period, it is analyzed by the oxygen content analyzer 5. If a the oxygen content is lower than the use requirement, it is released; if b the oxygen content is higher than the use requirement, it is recycled. The flue gas entering the recycling is pressurized by the oxygen compressor 6, and then passes through the Co2 adsorption device 7 to remove impurities such as Co2, N2, and water vapor in the flue gas. The Co2 adsorption device 7 is composed of Co2 adsorption tank A / B, air inlet control valve A / B, air outlet control valve A / B, and exhaust control valve A / B. Adsorbent is contained in Co2 adsorption tank A / B. When Co2 adsorption tank A adsorbs flue gas Co2, N2, water vapor, etc., pure oxygen with qualified purity is discharged through air outlet control valve A7-12; at this time, Co2 adsorption tank B7-2 is heated and analyzed, and the Co2, N2, and water vapor adsorbed on the adsorbent are analyzed by heating the adsorbent before, and the inlet / outlet control valve B is closed. Co2 adsorption tanks A and B adsorb and analyze alternately and are recycled. The purified flue gas is pure oxygen, which enters the buffer tank 8, and is supplemented with the required oxygen through the oxygen supply main pipe 11 and the pressure reducing valve group 10, and then enters the multi-stage tubular heat exchanger 3 through the oxygen pressure regulating valve group, and the oxygen temperature is raised to 550-600℃, and then enters the kiln for use.

[0041] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention, and the purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the implementation methods of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A furnace high-temperature oxygen circulation and heat energy utilization device, comprising a furnace, a ceramic filter cartridge high-temperature dust collector group, a multi-stage tubular heat exchanger, an induced draft fan, an oxygen compressor, a Co2 adsorption device and a valve group, characterized in that: The ceramic filter cartridge high-temperature dust collector group is connected in parallel, and the multi-stage tubular heat exchanger on one side of the ceramic filter cartridge high-temperature dust collector includes a first-stage tubular heat exchanger and a second-stage tubular heat exchanger connected to each other. The cold source medium inlet of the multi-stage tubular heat exchanger is connected to the valve group, and the Co2 adsorption device includes Co2 adsorption tank A, Co2 adsorption tank B and a control valve.

2. A furnace high temperature oxygen circulation and heat energy utilization device according to claim 1, characterized in that: The air inlet of the ceramic filter cartridge high-temperature dust collector group on one side of the furnace is connected, and the ceramic filter cartridge high-temperature dust collector group includes two parallel ceramic filter cartridge high-temperature dust collectors, the inlets and outlets of the ceramic filter cartridge high-temperature dust collectors are connected, and the outlet is connected to the multi-stage tubular heat exchanger.

3. A furnace high temperature oxygen circulation and heat energy utilization device according to claim 2, characterized in that: The multi-stage tubular heat exchanger includes a primary tubular heat exchanger and a secondary tubular heat exchanger. The inlet on one side of the primary tubular heat exchanger is connected to the outlet of the ceramic filter cartridge high-temperature dust collector group, and the outlet of the heat source medium after heat exchange at the top of the primary tubular heat exchanger is connected to the furnace.

4. A furnace high temperature oxygen circulation and heat energy utilization device according to claim 1, characterized in that: The outlet of the primary tubular heat exchanger is connected to the inlet of the secondary tubular heat exchanger, the outlet of the secondary tubular heat exchanger is connected to the induced draft fan, and the heat source medium outlet of the secondary tubular heat exchanger is connected to the furnace.

5. The furnace high temperature oxygen circulation and heat energy utilization device according to claim 1, characterized in that: The induced draft fan is connected to the oxygen compressor, and an oxygen content analyzer and a vent valve are also connected between the induced draft fan and the oxygen compressor.

6. The furnace high temperature oxygen circulation and heat energy utilization device according to claim 1, characterized in that: The oxygen compressor is connected to an intake control valve A and an intake control valve B of the Co2 adsorption device, and the intake control valve A and the intake control valve B are connected to one side of the Co2 adsorption tank A and one side of the Co2 adsorption tank B respectively.

7. A furnace high temperature oxygen circulation and heat energy utilization device according to claim 6, characterized in that: The other side of the Co2 adsorption tank A and the other side of the Co2 adsorption tank B are connected to the gas outlet control valve A and the gas outlet control valve B respectively. The gas outlet control valve A and the gas outlet control valve B are both connected to the buffer tank. The tops of the Co2 adsorption tank A and the Co2 adsorption tank B are respectively provided with exhaust control valve A and exhaust control valve B.

8. A furnace high temperature oxygen circulation and heat energy utilization device according to claim 7, characterized in that: The buffer tank and the pressure reducing valve group are connected via the valve group and the multi-stage tubular heat exchanger, and the pressure reducing valve group is connected to the oxygen supply main pipe.

9. The furnace high temperature oxygen circulation and heat energy utilization device according to claim 1, characterized in that: The valve group includes two parallel-connected pressure regulating valve groups.

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