Gas energy recovery and desulfurization coupling system of smelting reduction furnace

Abstract

The invention provides a smelting reduction furnace gas energy recovery and desulfurization coupling system which comprises a smelting reduction furnace with a gas discharge end; the gas turbine device is provided with a first gas input end and a first gas output end, the first gas input end is communicated with the gas discharge end, and the gas turbine device is used for converting pressure energy of gas into mechanical energy; the coal gas fine desulfurization device is provided with a second coal gas input end and a second coal gas output end, the second coal gas input end is communicated with the first coal gas output end, and the coal gas fine desulfurization device is used for carrying out desulfurization treatment on the coal gas. The smelting reduction furnace gas energy recovery system provided by the invention can be used for recovering gas complementary energy, reducing the sulfide content in the gas, improving the cleanliness of the gas, improving the quality of the gas and the utilization efficiency during subsequent reutilization, and being beneficial to reducing the sulfur content of flue gas generated after the gas is reutilized; and the requirement of the ultra-low emission standard of the flue gas is met.

Description

Technical Field

[0001] The present disclosure relates to the technical field of non-blast furnace ironmaking, and in particular to a smelting reduction furnace coal gas energy recovery and desulfurization coupling system. Background Art

[0002] In traditional technology, a blast furnace uses a total of about 500 kg of coke and coal powder to smelt each ton of pig iron. Both coke and coal are fossil energy sources, which easily produce a large amount of greenhouse gas carbon emissions during production, causing significant environmental pollution. As a result, the application of non-blast furnace smelting reduction ironmaking processes with relatively low carbon emissions is becoming more and more widespread. However, in actual applications, non-blast furnace smelting reduction ironmaking processes are still accompanied by the generation of pollutants and high energy consumption. Summary of the invention

[0003] The present disclosure aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] In view of this, according to an embodiment of the present disclosure, a smelting reduction furnace coal gas energy recovery and desulfurization coupling system is proposed, comprising:

[0005] A smelting reduction furnace having a gas discharge end;

[0006] A gas turbine device having a first gas input end and a first gas output end, wherein the first gas input end is connected to the gas discharge end, and the gas turbine device is used for converting the pressure energy of the gas into mechanical energy;

[0007] The coal gas fine desulfurization device has a second coal gas input end and a second coal gas output end. The second coal gas input end is connected to the first coal gas output end. The coal gas fine desulfurization device is used for desulfurizing the coal gas.

[0008] In a feasible embodiment, the smelting reduction furnace coal gas energy recovery and desulfurization coupling system further includes:

[0009] An air supply device has a power input end and a gas output end, the smelting reduction furnace also has an air inlet end, the gas output end of the air supply device is connected to the air inlet end, and the air supply device is used to transport air to the air inlet end;

[0010] A power device, connected to the power input end, used to drive the air supply device to operate;

[0011] The gas turbine device also has a mechanical energy output end, and the clutch is connected between the power input end and the mechanical energy output end.

[0012] In a feasible implementation manner, the clutch is configured to cut off the power connection between the mechanical energy output end and the power input end when the output speed of the mechanical energy output end is less than a preset speed.

[0013] In a feasible embodiment, the smelting reduction furnace coal gas energy recovery and desulfurization coupling system further includes:

[0014] A hot air furnace is connected between the gas output end and the air inlet end and is used to heat the air;

[0015] The spray gun is connected between the hot air furnace and the air inlet end.

[0016] In a feasible embodiment, the smelting reduction furnace coal gas energy recovery and desulfurization coupling system further includes:

[0017] The waste heat recovery device is connected between the coal gas discharge end and the first coal gas input end.

[0018] In a feasible implementation manner, the waste heat recovery device includes:

[0019] A gas channel connected between the gas discharge end and the first gas input end;

[0020] The steam generating device is heat-transferably connected to the coal gas channel, and the steam generating device has a steam output end.

[0021] In a feasible embodiment, the smelting reduction furnace coal gas energy recovery and desulfurization coupling system further includes:

[0022] The dust removal device is connected between the waste heat recovery device and the first coal gas input end.

[0023] In a feasible implementation manner, the dust removal device is a dry dust removal device.

[0024] In a feasible embodiment, the smelting reduction furnace coal gas energy recovery and desulfurization coupling system further includes:

[0025] a pressure reducing valve having a third gas input end and a third gas output end, wherein the third gas input end is connected to the gas discharge end, and the third gas output end is connected to the second gas input end;

[0026] The pressure reducing valve is configured to be cut off when the gas turbine device is running, or to be opened when the gas turbine device is shut down.

[0027] In a feasible implementation manner, there are multiple pressure reducing valves.

[0028] Compared with the prior art, the present disclosure has at least the following beneficial effects: the smelting reduction furnace gas energy recovery and desulfurization coupling system provided in the embodiment of the present disclosure includes a smelting reduction furnace, a gas turbine device and a gas fine desulfurization device, wherein the smelting reduction furnace can be used for smelting steel, and has a gas discharge end, which can be used to discharge the gas generated during the smelting process; the first gas input end of the gas turbine device is connected to the aforementioned gas discharge end, so that the gas turbine device can be connected to the gas discharged from the smelting reduction furnace and can convert the pressure energy of the aforementioned gas into mechanical energy to recover the residual energy of the gas. In actual applications, the gas turbine device can convert the gas obtained by the gas turbine device into mechanical energy. Mechanical energy can be used to provide equipment with power requirements, thereby realizing the recovery and utilization of surplus energy of coal gas. The first coal gas output end of the gas turbine device can further discharge the coal gas after the surplus energy is recovered; the second coal gas input end of the coal gas fine desulfurization device is connected to the aforementioned first coal gas output end, so that the coal gas fine desulfurization device can be connected to the coal gas discharged from the gas turbine device and can further desulfurize the aforementioned coal gas, thereby reducing the sulfide content in the coal gas, which can improve the cleanliness of the coal gas, improve the quality of the coal gas and the utilization efficiency during subsequent reuse, and is beneficial to reducing the sulfur content of the flue gas generated after the reuse of the coal gas, meeting the requirements of the ultra-low flue gas emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the exemplary embodiments below. The accompanying drawings are only for the purpose of illustrating exemplary embodiments and are not to be considered as limiting the present disclosure. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0030] Figure 1 A schematic structural diagram of a molten reduction furnace gas energy recovery and desulfurization coupling system according to an embodiment of the present invention.

[0031] in, Figure 1 The corresponding relationship between the reference numerals and the component names is as follows:

[0032] 10 smelting reduction furnace; 11 gas turbine device; 12 gas fine desulfurization device; 13 air supply device; 14 power device; 15 clutch; 16 hot air furnace; 17 spray gun; 18 waste heat recovery device; 19 dust removal device; 20 pressure reducing valve;

[0033] 181Steam output terminal. DETAILED DESCRIPTION

[0034] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] like Figure 1 As shown, according to an embodiment of the present disclosure, a smelting reduction furnace gas energy recovery and desulfurization coupling system is proposed, including: a smelting reduction furnace 10, having a gas discharge end; a gas turbine device 11, having a first gas input end and a first gas output end, the first gas input end is connected to the gas discharge end, and the gas turbine device 11 is used to convert the pressure energy of the gas into mechanical energy; a gas fine desulfurization device 12, having a second gas input end and a second gas output end, the second gas input end is connected to the first gas output end, and the gas fine desulfurization device 12 is used to desulfurize the coal gas.

[0036] The smelting reduction furnace gas energy recovery and desulfurization coupling system provided in the embodiment of the present disclosure includes a smelting reduction furnace 10, a gas turbine device 11 and a gas fine desulfurization device 12, wherein the smelting reduction furnace 10 can be used for smelting steel, and has a gas discharge end, which can be used to discharge the coal gas generated during the smelting process; the first coal gas input end of the gas turbine device 11 is connected to the aforementioned coal gas discharge end, so that the gas turbine device 11 can be connected to the coal gas discharged from the smelting reduction furnace 10 and can convert the pressure energy of the aforementioned coal gas into mechanical energy to recover the residual energy of the coal gas. In actual applications, the mechanical energy converted by the gas turbine device 11 can be used for It is provided to equipment with power demand, thereby realizing the recovery and utilization of surplus energy of coal gas. The first coal gas output end of the gas turbine device 11 can further discharge the coal gas after the surplus energy is recovered; the second coal gas input end of the coal gas fine desulfurization device 12 is connected to the aforementioned first coal gas output end, so that the coal gas fine desulfurization device 12 can be connected to the coal gas discharged from the gas turbine device 11 and can further desulfurize the aforementioned coal gas, thereby reducing the sulfide content in the coal gas, which can improve the cleanliness of the coal gas, improve the quality of the coal gas and the utilization efficiency during subsequent reuse, and is beneficial to reducing the sulfur content of the flue gas generated after the reuse of the coal gas, meeting the requirements of the ultra-low emission standards for flue gas.

[0037] It is understandable that the coal gas discharged from the smelting reduction furnace 10 usually has a relatively high pressure. Based on the arrangement of the aforementioned coal gas turbine device 11, the pressure energy of the coal gas can be recycled, which is beneficial to reducing the residual energy loss of the coal gas and improving the energy saving of smelting reduction smelting. The aforementioned coal gas turbine device 11 can directly convert the pressure energy of the coal gas into mechanical energy, that is, there is no need to convert the pressure energy into electrical energy or other forms of energy first, thereby reducing the number of energy form conversions and reducing energy losses.

[0038] It is understandable that the pressure of the coal gas discharged through the coal gas turbine device 11 is relatively low, which is convenient for desulfurization of the coal gas and helps to provide guarantee for the desulfurization effect of the coal gas fine desulfurization device 12 .

[0039] like Figure 1 As shown, in some examples, the smelting reduction furnace gas energy recovery and desulfurization coupling system also includes: an air supply device 13, having a power input end and a gas output end, the smelting reduction furnace 10 also has an air inlet end, the gas output end of the air supply device 13 is connected to the air inlet end, and the air supply device 13 is used to transport air to the air inlet end; a power device 14, connected to the power input end, used to drive the air supply device 13 to operate; a clutch 15, the gas turbine device 11 also has a mechanical energy output end, and the clutch 15 is connected between the power input end and the mechanical energy output end.

[0040] In this technical solution, the smelting reduction furnace gas energy recovery and desulfurization coupling system may also include an air supply device 13, a power device 14 and a clutch 15, wherein the power device 14 is connected to the power input end of the air supply device 13 and can be used to drive the air supply device 13 to operate. When the air supply device 13 is in operation, the air can be pressurized and transported to the air inlet end of the smelting reduction furnace 10 to provide the smelting reduction furnace 10 with the air flow required for production; the clutch 15 is connected between the mechanical energy output end of the gas turbine device 11 and the aforementioned power input end, so that the gas turbine device 11 can be connected to the aforementioned power input end through the clutch 15 to provide the mechanical energy converted from the gas pressure energy to the air supply device 13, and then, when the power required for the operation of the air supply device 13 is certain, the mechanical energy output by the gas turbine device 11 can be used to supplement at least part of the power demand of the air supply device 13, thereby reducing the energy consumption of the power device 14 and further improving the energy saving of smelting reduction smelting.

[0041] It can be understood that the aforementioned air supply device 13 can be but not limited to a fan; the aforementioned power device 14 can be but not limited to a motor.

[0042] It can be understood that the aforementioned clutch 15 has a connected state and a disconnected state. In the connected state, the aforementioned mechanical energy output end can transmit power to the aforementioned power input end through the clutch 15 to drive the air supply device 13 to operate. In the disconnected state, the power connection between the aforementioned mechanical energy output end and the aforementioned power input end is cut off, thereby facilitating maintenance and repair of the gas turbine device 11.

[0043] In some examples, the clutch 15 is configured to cut off the power connection between the mechanical energy output end and the power input end when the output speed of the mechanical energy output end is less than a preset speed.

[0044] In this technical solution, the aforementioned clutch 15 can be configured to cut off the power connection between the mechanical energy output end and the power input end when the output speed of the mechanical energy output end is less than the preset speed, that is, the clutch 15 is converted from the aforementioned connection state to the cut-off state; it can be understood that when the output speed of the mechanical energy output end is less than the preset speed, it means that the gas turbine device 11 may have a fault. By setting the clutch 15 to cut off the power connection between the mechanical energy output end and the power input end in this case, it can facilitate the maintenance and repair of the gas turbine device 11. Accordingly, the power required for the operation of the air supply device 13 can be provided by the power device 14, which can provide a guarantee for the air supply device 13 to perform the air supply operation, thereby ensuring the stable production of the molten reduction furnace 10.

[0045] It can be understood that the aforementioned preset speed can be set according to actual needs; illustratively, the aforementioned speed can be less than or equal to 2000rpm, for example, 1500rpm, 1000rpm, 500rpm, 200rpm, etc.

[0046] like Figure 1 As shown, in some examples, the molten reduction furnace gas energy recovery and desulfurization coupling system also includes: a hot blast furnace 16, connected between the gas output end and the air inlet end, for heating the air; and a spray gun 17, connected between the hot blast furnace 16 and the air inlet end.

[0047] In this technical solution, the smelting reduction furnace coal gas energy recovery and desulfurization coupling system may also include a hot blast furnace 16 and a spray gun 17, wherein the hot blast furnace 16 is connected between the gas output end and the air inlet end, so that the hot blast furnace 16 can be connected to the air output by the air supply device 13 and can be used to heat the aforementioned air, so as to cooperate with the air supply device 13 to increase the air pressure while increasing the air temperature, thereby facilitating the participation of air in smelting; the spray gun 17 is connected between the hot blast furnace 16 and the air inlet end, so that the air output by the hot blast furnace 16 can be sprayed into the smelting reduction furnace 10, thereby improving the air supply efficiency and supply effect to the smelting reduction furnace 10.

[0048] It can be understood that the aforementioned spray gun 17 can be a hot air spray gun 17 for outputting high-speed swirling gas.

[0049] like Figure 1 As shown, in some examples, the molten reduction furnace coal gas energy recovery and desulfurization coupling system also includes: a waste heat recovery device 18, which is connected between the coal gas exhaust end and the first coal gas input end.

[0050] In this technical solution, the smelting reduction furnace gas energy recovery and desulfurization coupling system may also include a waste heat recovery device 18 connected between the gas discharge end and the first gas input end, so that the waste heat recovery device 18 can be connected to the gas output by the smelting reduction furnace 10, and recover the thermal energy of the aforementioned gas, thereby further reducing the thermal energy of the gas at any time and improving the energy saving of smelting reduction smelting. Accordingly, the gas output by the waste heat recovery device 18 can be further supplied to the gas turbine system to recover the pressure energy of the gas, which is beneficial to further reduce the waste energy loss of the gas.

[0051] like Figure 1 As shown, in some examples, the waste heat recovery device 18 includes: a gas channel connected between the gas discharge end and the first gas input end; a steam generating device connected to the gas channel in a heat transfer manner, and the steam generating device has a steam output end 181.

[0052] In this technical solution, the aforementioned waste heat recovery device 18 may include a gas channel and a steam generating device, wherein the gas channel is connected between the gas discharge end and the first gas input end, so that the waste heat recovery device 18 receives the gas output by the smelting reduction furnace 10 and outputs the waste heat recovered gas to the gas turbine device 11; the steam generating device is heat-transfer connected to the aforementioned gas channel and can be used to generate steam. It can be understood that the steam generating device can absorb the heat of the gas channel and use the aforementioned heat to produce steam by heat transfer with the gas channel, thereby realizing the utilization of the waste heat of the coal gas. The steam output end 181 of the steam generating device can be used to output steam. In actual applications, the steam output end 181 can be used to connect to a steam power generation system or other systems or devices that need to use steam during production, so as to provide steam for the aforementioned system or device and reduce the energy consumption of the aforementioned system or device.

[0053] It can be understood that the aforementioned steam generating device can be used to generate saturated steam.

[0054] like Figure 1 As shown, in some examples, the molten reduction furnace gas energy recovery and desulfurization coupling system also includes: a dust removal device 19, which is connected between the waste heat recovery device 18 and the first gas input end.

[0055] In this technical solution, the smelting reduction furnace coal gas energy recovery and desulfurization coupling system can also include a dust removal device 19 connected between the waste heat recovery device 18 and the first coal gas input end, so that the dust removal device 19 can be connected to the coal gas output by the waste heat recovery device 18, and the aforementioned coal gas is subjected to dust removal treatment, which is conducive to improving the cleanliness and quality of the coal gas, further improving the quality and utilization efficiency of the coal gas output by the smelting reduction furnace coal gas energy recovery and desulfurization coupling system, and reducing the difficulty of treating the flue gas generated after the coal gas is utilized. In addition, after the coal gas is discharged through the waste heat recovery device 18, the temperature is relatively low, which can facilitate dust removal treatment, improve the stability and reliability of the dust removal operation, reduce the risk of failure and damage of the dust removal device 19, and provide reliable guarantee for the dust removal effect.

[0056] In some examples, the dust removal device 19 is a dry dust removal device 19 .

[0057] In this technical solution, the aforementioned dust removal device 19 can be a dry dust removal device 19. Based on the aforementioned setting, the energy consumption of the dust removal operation can be further reduced, which is beneficial to further improve the energy saving of molten reduction smelting while improving the cleanliness of coal gas.

[0058] like Figure 1 As shown, in some examples, the molten reduction furnace gas energy recovery and desulfurization coupling system also includes: a pressure reducing valve 20, having a third gas input terminal and a third gas output terminal, the third gas input terminal is connected to the gas discharge terminal, and the third gas output terminal is connected to the second gas input terminal; wherein the pressure reducing valve 20 is configured to be cut off when the gas turbine device 11 is running, or to be turned on when the gas turbine device 11 is closed.

[0059] In this technical solution, the smelting reduction furnace coal gas energy recovery and desulfurization coupling system may also include a pressure reducing valve 20, the third coal gas input end of the pressure reducing valve 20 is connected to the aforementioned coal gas discharge end, and the third coal gas output end of the pressure reducing valve 20 is connected to the aforementioned second coal gas input end, so that the pressure reducing valve 20 can be connected to the coal gas output from the smelting reduction furnace 10, and can reduce the pressure of the coal gas and then output it to the coal gas fine desulfurization device 12, and the pressure reducing valve 20 is configured to be cut off when the coal gas turbine device 11 is running, or to be turned on when the coal gas turbine device 11 is closed, that is, at the same time, the coal gas fine desulfurization device 12 can receive Based on the above-mentioned arrangement, the lower-pressure gas output by one of the gas turbine device 11 and the pressure reducing valve 20 can, on the one hand, make the gas pressure connected to the gas fine desulfurization device 12 lower, which is convenient for desulfurization treatment of the gas and beneficial to provide guarantee for the desulfurization effect of the gas fine desulfurization device 12; on the other hand, the pressure reducing valve 20 can form a parallel relationship with the gas turbine device 11, so as to provide a channel for the gas to flow to the gas fine desulfurization device 12 during the overhaul and maintenance of the gas turbine device 11, thereby ensuring the gas discharge from the smelting reduction furnace 10 and providing guarantee for the smooth production of the smelting reduction furnace 10.

[0060] like Figure 1 As shown, in some examples, the number of the pressure reducing valve 20 is plural.

[0061] In this technical solution, the number of the aforementioned pressure reducing valves 20 can be multiple, that is, the gas turbine device 11 is connected in parallel to a pressure reducing valve group composed of multiple pressure reducing valves 20 in parallel. Based on the aforementioned arrangement, when the gas turbine device 11 is closed, multiple pressure reducing valves 20 can be used to reduce the pressure of the coal gas, and the coal gas can be directed to the coal gas fine desulfurization device 12, which is beneficial to ensure the pressure reducing efficiency and flow rate of the coal gas, and provide further guarantee for the stable production of the molten reduction furnace 10.

[0062] like Figure 1 As shown, as a specific example of the smelting reduction furnace gas energy recovery and desulfurization coupling system provided in the present application, the aforementioned smelting reduction furnace gas energy recovery and desulfurization coupling system may include a smelting reduction furnace 10, a waste heat recovery device 18, a dry dust removal device 19, a gas turbine device 11, an air supply device 13, a power device 14, a clutch 15, a hot air furnace 16, a spray gun 17, a pressure reducing valve group and a gas fine desulfurization device 12.

[0063] Among them, the smelting reduction furnace 10 can generate high-temperature and high-pressure raw coal gas; the waste heat recovery device 18 can recover the heat of the aforementioned high-temperature and high-pressure raw coal gas to convert the high-temperature and high-pressure raw coal gas into medium-temperature and high-pressure raw coal gas, and the waste heat recovery device 18 includes the aforementioned coal gas channel and steam generating device, the waste heat recovery device 18 can use the heat of the high-temperature and high-pressure raw coal gas to generate saturated steam and send it to power generation or steam users; the coal gas dry dust removal device, the medium-temperature and high-pressure raw coal gas is purified into medium-temperature and high-pressure clean coal gas through dry dust removal; the medium-temperature and high-pressure clean coal gas is further recovered by the gas turbine device 11. The waste pressure and waste heat, the waste energy of the medium-temperature and medium-pressure clean coal gas is converted into mechanical energy through the gas turbine, and the recovered energy is directly used as rotational mechanical energy to supplement the shaft system of the air supply device 13 and the power device 14, avoiding the loss of energy conversion, so that the power device 14 driving the air supply device 13 reduces the current and saves energy, Accordingly, the medium-temperature and medium-pressure clean coal gas is converted into low-temperature and low-pressure clean coal gas; the air can be pressurized into cold air with a certain temperature and pressure through the air supply device 13; the pressure reducing valve group includes a plurality of pressure reducing valves in parallel. When the gas turbine device 11 itself fails, the medium-temperature and high-pressure clean coal gas can be converted into medium-temperature and low-pressure clean coal gas through the pressure reducing valve group in parallel with the gas turbine device 11, so as to ensure the normal production of the smelting reduction furnace 10; the low-temperature and low-pressure clean coal gas flowing out of the gas turbine device 11 or the low-pressure and medium-temperature clean coal gas flowing out of the pressure reducing valve group can enter the gas fine desulfurization device 12, and the low-temperature and low-pressure clean coal gas of the smelting reduction furnace 10 after fine desulfurization is provided to the downstream users; the hot blast furnace 16 is used to heat the aforementioned cold air and convert it into high-temperature hot air with a certain pressure; the spray gun 17 is used to spray the aforementioned high-temperature hot air into the smelting reduction furnace 10 in a high-speed swirl manner to meet the requirements of smelting reduction smelting.

[0064] It is understandable that if Figure 1 As shown, the aforementioned waste heat recovery device 18 is connected between the gas discharge end of the smelting reduction furnace 10 and the dry dust removal device 19; the dry dust removal device 19 is connected between the gas turbine device 11 and the waste heat recovery device 18; the first gas input end of the gas turbine device 11 is connected between the dry dust removal device 19 and the gas fine desulfurization device 12, the mechanical energy output end of the gas turbine device 11 is connected to the power input end of the air supply device 13 through the clutch 15, and the power device 14 is connected to the aforementioned power input end; the pressure reducing valve group includes a plurality of pressure reducing valves 20 in parallel, the third gas input end of the pressure reducing valve 20 is connected to the gas discharge end, and the third gas output end is connected to the second gas input end of the gas fine desulfurization device 12; the second gas input end of the gas fine desulfurization device 12 is connected to the pressure reducing valve 20 and the gas turbine device 11, when the gas turbine device 11 fails, the gas fine desulfurization device 12 is connected to the pressure reducing valve 20. The hot blast furnace 16 is connected between the spray gun 17 and the air supply device 13 , and the spray gun 17 is connected to the air inlet end of the smelting reduction furnace 10 .

[0065] The present application provides a method for coupling energy recovery and desulfurization of coal gas from a smelting reduction furnace, the method comprising:

[0066] Step S1: heat-exchange water with the high-temperature and high-pressure raw coal gas generated by the smelting reduction furnace 10 to generate saturated steam and medium-temperature and high-pressure raw coal gas; it can be understood that the high-temperature and high-pressure raw coal gas (1500-2000m 3 / t iron; 1400℃~1600℃, ≥0.08MPa, dust content 10~50g / Nm 3 ) brings out a lot of energy, and after waste heat recovery, a large amount of saturated steam is produced for power generation or steam delivery to users. After waste heat recovery, it is converted into medium-temperature and high-pressure raw coal gas (100℃~250℃, ≥0.08MPa, dust content 10~50g / Nm 3 ).

[0067] Step S2: The medium-temperature and high-pressure clean coal gas generated by the dry dust removal of coal gas is further passed through the coal gas turbine device 11 to generate mechanical energy and low-temperature and low-pressure clean coal gas; it can be understood that the medium-temperature and high-pressure raw coal gas is converted into medium-temperature and high-pressure clean coal gas (100℃~250℃, ≥0.08MPa, dust content ≤5mg / Nm 3 ), the medium temperature and high pressure clean coal gas is purified by the coal gas turbine device 11 and then converted into low temperature and low pressure clean coal gas (40℃~80℃, ~10KPa, 100~2500mg / Nm 3 H2S, dust content ≤5mg / Nm 3 ).

[0068] Step S3: After the coal gas is refined desulfurized, a refined desulfurized low-temperature and low-pressure clean coal gas is generated; it can be understood that the low-temperature and low-pressure clean coal gas enters the coal gas refined desulfurization device 12 and is converted into a refined desulfurized low-temperature and low-pressure clean coal gas (30°C to 40°C, ~10KPa, ≤10mg / Nm 3 H2S, dust content ≤5mg / Nm 3 ) is provided to the next user.

[0069] Step S4: using the aforementioned mechanical energy to pressurize the air into cold air;

[0070] Step S5: The cold air is heated to high-temperature hot air by the hot blast furnace 16, and the high-temperature hot air is sprayed into the smelting reduction furnace 10 through the spray gun 17. It can be understood that the cold air (40°C-150°C, ≥0.08MPa) is heated by the hot blast furnace 16 and converted into high-temperature hot air (-1250°C, ≥0.08MPa) with a certain pressure, and the high-temperature hot air (-1250°C, ≥0.08MPa) is sprayed into the smelting reduction furnace 10 in a high-speed swirl manner through the spray gun 17 for smelting reduction ironmaking.

[0071] In the present disclosure, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0072] In the description of the present disclosure, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present disclosure.

[0073] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0074] The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A smelting reduction furnace gas energy recovery and desulfurization coupling system, characterized in that: include: A smelting reduction furnace having a gas discharge end; A gas turbine device, comprising a first gas input end and a first gas output end, wherein the first gas input end is connected to the gas discharge end, and the gas turbine device is used for converting the pressure energy of the gas into mechanical energy; The coal gas fine desulfurization device has a second coal gas input end and a second coal gas output end, wherein the second coal gas input end is connected to the first coal gas output end, and the coal gas fine desulfurization device is used for desulfurizing the coal gas.

2. The smelting reduction furnace gas energy recovery and desulfurization coupling system according to claim 1 is characterized in that: Also includes: An air supply device having a power input end and a gas output end, the smelting reduction furnace also having an air inlet end, the gas output end of the air supply device being connected to the air inlet end, and the air supply device being used to transport air to the air inlet end; A power device, connected to the power input end, used to drive the air supply device to operate; The gas turbine device also has a mechanical energy output end, and the clutch is connected between the power input end and the mechanical energy output end.

3. The smelting reduction furnace gas energy recovery and desulfurization coupling system according to claim 2 is characterized in that: The clutch is configured to cut off the power connection between the mechanical energy output end and the power input end when the output speed of the mechanical energy output end is less than a preset speed.

4. The smelting reduction furnace gas energy recovery and desulfurization coupling system according to claim 2 is characterized in that: Also includes: A hot air furnace, connected between the gas output end and the air inlet end, for heating the air; A spray gun is connected between the hot air furnace and the air inlet end.

5. The smelting reduction furnace gas energy recovery and desulfurization coupling system according to claim 1 is characterized in that: Also includes: A waste heat recovery device is connected between the coal gas discharge end and the first coal gas input end.

6. The smelting reduction furnace gas energy recovery and desulfurization coupling system according to claim 5, characterized in that: The waste heat recovery device comprises: A gas channel connected between the gas discharge end and the first gas input end; A steam generating device is heat-transferably connected to the coal gas channel, and the steam generating device has a steam output end.

7. The smelting reduction furnace gas energy recovery and desulfurization coupling system according to claim 5, characterized in that: Also includes: The dust removal device is connected between the waste heat recovery device and the first coal gas input end.

8. The smelting reduction furnace gas energy recovery and desulfurization coupling system according to claim 7, characterized in that: The dust removal device is a dry dust removal device.

9. The smelting reduction furnace gas energy recovery and desulfurization coupling system according to any one of claims 1 to 8, characterized in that: Also includes: a pressure reducing valve, having a third gas input end and a third gas output end, wherein the third gas input end is connected to the gas discharge end, and the third gas output end is connected to the second gas input end; The pressure reducing valve is configured to be cut off when the gas turbine device is running, or to be opened when the gas turbine device is closed.

10. The smelting reduction furnace gas energy recovery and desulfurization coupling system according to claim 9, characterized in that: The number of the pressure reducing valves is multiple.

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