Gas residual pressure power generation and gas fine desulfurization coupling system for smelting reduction furnace

Abstract

The invention discloses a smelting reduction furnace gas residual pressure power generation and gas fine desulfurization coupling system, and relates to the technical field of non-blast furnace ironmaking. The power generation device is provided with a first coal gas input end and a first coal gas output end, the first coal gas input end is communicated with the coal gas discharge end, and the power generation device is used for converting pressure energy and heat energy of coal gas into electric 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. According to the invention, the residual energy of the coal gas can be recovered, the content of sulfide in the coal gas can be reduced, the cleanliness of the coal gas can be improved, the quality of the coal gas and the utilization efficiency during subsequent reutilization can be improved, the sulfur content of the flue gas generated after the coal gas is reutilized can be reduced, and the requirement of the ultra-low emission standard of the flue gas is met.

Description

Technical Field

[0001] The present application relates to the technical field of non-blast furnace ironmaking, and in particular to a coupling system for power generation and fine desulfurization of coal gas from a smelting reduction furnace. Background Art

[0002] At present, in the iron-making process, traditional blast furnaces in steel plants use a total of about 500 kilograms of coke and pulverized coal to smelt each ton of pig iron. Both coke and coal are fossil energy sources, which ultimately produce a large amount of greenhouse gas carbon emissions, causing serious environmental pollution.

[0003] However, non-blast furnace smelting reduction ironmaking processes have gradually been recognized and promoted by the industry, but usually non-blast furnace smelting reduction ironmaking processes still use coke powder or coal powder as a reducing agent. At present, attempts have been made to inject hydrogen and biomass charcoal to replace coke powder or coal powder as reducing agents. Although carbon emissions are much reduced compared to traditional blast furnace ironmaking processes, there are still more CO2, CO and H2S emissions, which still cause great pollution to the environment and climate. However, how to reduce the energy consumption per unit process of smelting reduction ironmaking, recover the waste heat and waste pressure of high-temperature and high-pressure smelting reduction coal gas, and achieve ultra-low emissions are also urgent problems to be solved in the smelting reduction ironmaking process. At present, there is no appropriate method to solve the above problems. Therefore, it is necessary to propose a smelting reduction furnace coal gas waste pressure power generation and coal gas fine desulfurization coupling system to at least solve some of the above problems. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In a first aspect, an embodiment of the present application provides a smelting reduction furnace coal gas residual pressure power generation and coal gas fine desulfurization coupling system, the system comprising:

[0006] A smelting reduction furnace having a gas discharge end;

[0007] A power generation 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 power generation device is used to convert the pressure energy and thermal energy of the gas into electrical energy;

[0008] 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.

[0009] In one embodiment of the present invention, the smelting reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system further includes:

[0010] A waste heat recovery device is connected between the coal gas discharge end and the first coal gas input end.

[0011] In one embodiment of the present invention, the waste heat recovery device further comprises:

[0012] A gas channel connected between the gas discharge end and the first gas input end;

[0013] A steam generating device is heat-transferably connected to the coal gas channel, and the steam generating device has a steam output end.

[0014] In one embodiment of the present invention, the smelting reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system further includes:

[0015] A coal gas dust removal device is connected between the waste heat recovery device and the first coal gas input end.

[0016] In one embodiment of the present invention, the coal gas dust removal device is a dry dust removal device.

[0017] In one embodiment of the present invention, the smelting reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system further includes:

[0018] The bypass pressure reducing valve has a third gas input end and a third gas output end, wherein the third gas input end is communicated with the gas discharge end, and the third gas output end is communicated with the second gas input end.

[0019] In one embodiment of the present invention, there are multiple bypass pressure reducing valves.

[0020] In one embodiment of the present invention, the smelting reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system further includes:

[0021] A controller, the bypass pressure reducing valve and the power generation device are both electrically connected to the controller;

[0022] a detector, electrically connected to the controller, for obtaining an output current value of an electric energy output end of the power generation device;

[0023] an alarm, electrically connected to the controller;

[0024] Wherein, the controller is used to control the bypass pressure reducing valve, the power generation device and the alarm according to the output current value.

[0025] In one embodiment of the present invention, the controller comprises:

[0026] A first control module, used for controlling the bypass pressure reducing valve and the alarm to operate, and controlling the power generation device to shut down, when the output current value is less than a first preset threshold value;

[0027] A second control module, configured to control the bypass pressure reducing valve to close when the output current value is greater than the first preset threshold value and less than a second preset threshold value;

[0028] The third control module is used for, when the output current value is greater than a second preset threshold value, the controller controls the bypass pressure reducing valve to operate.

[0029] In one embodiment of the present invention, the power generation device comprises:

[0030] A gas turbine unit having a mechanical energy output end, the first gas input end and the first gas output end, the gas turbine unit being used for converting the pressure energy of the gas into mechanical energy;

[0031] The power generation unit has a power input end, and the power input end is connected to the mechanical energy output end.

[0032] In summary, a smelting reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system according to an embodiment of the present application includes: a smelting reduction furnace, a power generation device and a gas fine desulfurization device, wherein the smelting reduction furnace can be used for smelting steel, and has a gas discharge end, and the gas discharge end can be used to discharge the gas generated during the smelting process; the first gas input end of the power generation device is connected to the aforementioned gas discharge end, so that the power generation device can be connected to the gas discharged from the smelting reduction furnace and can convert the pressure energy and thermal energy of the aforementioned gas into electrical energy to recover the gas waste energy. In actual applications, the electrical energy converted by the power generation device can be used for and The coal gas is fed into the power grid or transmitted to users, thereby realizing the recovery and utilization of the surplus energy of the coal gas. The first coal gas output end of the power generation 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 power generation 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 of subsequent reuse, and is conducive to reducing the sulfur content of the flue gas generated after the reuse of the coal gas, so as to meet the requirements of the ultra-low emission standards for flue gas.

[0033] The molten reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system proposed in this application, and other advantages, objectives and features of this application will be reflected in part through the following description, and in part will also be understood by technical personnel in this field through research and practice of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present specification. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0035] Figure 1 A schematic structural diagram of a smelting reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system provided in an embodiment of the present application;

[0036] in, Figure 1 The corresponding relationship between the reference numerals and the component names is as follows:

[0037] 10 smelting reduction furnace; 11 power generation device; 12 coal gas fine desulfurization device; 13 waste heat recovery device; 14 coal gas dust removal device; 15 bypass pressure reducing valve;

[0038] 131Steam output terminal. DETAILED DESCRIPTION

[0039] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0040] In this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the statement "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. The term "more than two" includes two or more than two situations.

[0041] See also Figure 1, which is a schematic structural diagram of a smelting reduction furnace coal gas waste pressure power generation and coal gas fine desulfurization coupling system provided in an embodiment of the present application, which may specifically include: a smelting reduction furnace 10, having a coal gas discharge end; a power generation device 11, having a first coal gas input end and a first coal gas output end, the first coal gas input end is connected to the coal gas discharge end, and the power generation device 11 is used to convert the pressure energy and thermal energy of the coal gas into electrical energy; a coal gas fine desulfurization device 12, having 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, and the coal gas fine desulfurization device 12 is used to desulfurize the coal gas.

[0042] The smelting reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system provided in the embodiment of the present disclosure includes a smelting reduction furnace 10, a power generation 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, and the gas discharge end can be used to discharge the gas generated during the smelting process; the first gas input end of the power generation device 11 is connected to the aforementioned gas discharge end, so that the power generation device 11 can be connected to the gas discharged from the smelting reduction furnace 10 and can convert the pressure energy of the aforementioned gas into electrical energy to recover the waste energy of the gas. In actual applications, the electrical energy converted by the power generation device 11 can be used for It is incorporated into the power grid or transmitted to users, thereby realizing the recovery and utilization of the surplus energy of the coal gas. The first coal gas output end of the power generation 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 by the power generation 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, so as to meet the requirements of the ultra-low emission standards for flue gas.

[0043] It can be understood that the coal gas discharged from the smelting reduction furnace 10 usually has a higher pressure. Based on the setting of the aforementioned power generation device 11, the pressure energy and thermal energy of the coal gas can be converted into electrical energy, which is beneficial to reduce the waste energy loss of the coal gas and improve the energy saving of smelting reduction smelting.

[0044] It can be understood that the pressure of the coal gas discharged from the power generation 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 .

[0045] like Figure 1 As shown, in some examples, the smelting reduction furnace coal gas waste pressure power generation and coal gas fine desulfurization coupling system also includes: a waste heat recovery device 13, which is connected between the coal gas discharge end and the first coal gas input end.

[0046] In this technical solution, the coupling system of the smelting reduction furnace coal gas waste pressure power generation and coal gas fine desulfurization can also include a waste heat recovery device 13 connected between the coal gas discharge end and the first coal gas input end, so that the waste heat recovery device 13 can be connected to the coal gas output by the smelting reduction furnace 10, and recover the thermal energy of the aforementioned coal gas, further reducing the thermal energy loss of the coal gas and improving the energy saving of smelting reduction smelting. Accordingly, the coal gas output by the waste heat recovery device 13 can be further supplied to the waste pressure power generation system to recover the pressure energy and thermal energy of the coal gas, which is beneficial to further reduce the waste energy loss of the coal gas.

[0047] like Figure 1 As shown, in some examples, the waste heat recovery device 13 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 131.

[0048] In this technical solution, the aforementioned waste heat recovery device 13 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 13 receives the gas output by the smelting reduction furnace 10 and outputs the waste heat recovered gas to the power generation 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 gas. The steam output end 131 of the steam generating device can be used to output steam. In actual applications, the steam output end 131 can be used to generate electricity or transport steam to users, so as to reduce the waste heat loss of the gas, thereby realizing the recovery and utilization of the waste heat of the gas.

[0049] It can be understood that the aforementioned steam generating device can be used to generate saturated steam.

[0050] like Figure 1 As shown, in some examples, the smelting reduction furnace coal gas waste pressure power generation and coal gas fine desulfurization coupling system also includes: a coal gas dust removal device 14, which is connected between the waste heat recovery device 13 and the first coal gas input end.

[0051] In this technical solution, the coupling system of coal gas waste pressure power generation and coal gas fine desulfurization of the smelting reduction furnace can also include a dust removal device 14 connected between the waste heat recovery device 13 and the first coal gas input end, so that the dust removal device 14 can be connected to the coal gas output by the waste heat recovery device 13, 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 coupling system of coal gas waste pressure power generation and coal gas fine desulfurization of the smelting reduction furnace, and reducing the difficulty of treating the flue gas generated after the utilization of the coal gas. In addition, after the coal gas is discharged through the waste heat recovery device 13, 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 14, and provide reliable guarantee for the dust removal effect.

[0052] In some examples, the dust removal device 14 is a dry dust removal device 14 .

[0053] In this technical solution, the aforementioned dust removal device 14 can be a dry dust removal device 14. 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.

[0054] like Figure 1 As shown, in some examples, the molten reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system also includes: a bypass pressure reducing valve 15, having a third gas input end and a third gas output end, 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.

[0055] In this technical solution, the coupling system of the coal gas surplus pressure power generation and coal gas fine desulfurization in the smelting reduction furnace can also include a bypass pressure reducing valve 15, the third coal gas input end of the bypass pressure reducing valve 15 is connected to the aforementioned coal gas discharge end, and the third coal gas output end of the bypass pressure reducing valve 15 is connected to the aforementioned second coal gas input end, so that the bypass pressure reducing valve 15 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. When the power generation device 11 is under maintenance, the power generation device 11 is shut down. In order to ensure the normal use of the coupling system of the coal gas surplus pressure power generation and coal gas fine desulfurization in the smelting reduction furnace, the bypass pressure reducing valve 15 is operated, that is, at the same At a certain moment, the coal gas fine desulfurization device 12 can receive the coal gas with lower pressure output by at least one of the power generation device 11 and the bypass pressure reducing valve 15. Based on the above-mentioned arrangement, on the one hand, the coal gas pressure connected to the coal gas fine desulfurization device 12 can be lowered, which is convenient for the desulfurization treatment of the coal gas and beneficial to provide guarantee for the desulfurization effect of the coal gas fine desulfurization device 12; on the other hand, the bypass pressure reducing valve 15 can form a parallel relationship with the power generation device 11, so as to provide a channel for the coal gas to flow to the coal gas fine desulfurization device 12 during the overhaul and maintenance of the power generation device 11, thereby ensuring the coal gas discharge from the smelting reduction furnace 10 and providing guarantee for the smooth production of the smelting reduction furnace 10.

[0056] like Figure 1 As shown, in some examples, the bypass pressure reducing valve 15 is provided in plural numbers.

[0057] In this technical solution, the number of the aforementioned bypass pressure reducing valves 15 can be multiple, that is, the power generation device 11 is connected in parallel to a bypass pressure reducing valve group composed of multiple bypass pressure reducing valves 15 in parallel. Based on the aforementioned arrangement, when the power generation device 11 is closed, multiple bypass pressure reducing valves 15 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 efficiency and flow rate of the pressure reduction treatment of the coal gas, and provide further guarantee for the smooth production of the smelting reduction furnace 10.

[0058] In some examples, the molten reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system also includes: a controller, the bypass pressure reducing valve 15 and the power generation device 11 are electrically connected to the controller; a detector, electrically connected to the controller, for obtaining the output current value of the power output end of the power generation device 11; an alarm, electrically connected to the controller; wherein the controller is used to control the bypass pressure reducing valve 15, the power generation device 11 and the alarm according to the output current value.

[0059] In this technical solution, the molten reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system can also include a controller, a detector and an alarm. The bypass pressure reducing valve 15, the power generation device 11, the detector and the alarm are all electrically connected to the controller. The detector can obtain the current value output by the power output end of the power generation device 11 and transmit the current value to the controller. After receiving the current value, the controller controls the opening and closing of the bypass pressure reducing valve 15 and the power generation device 11 according to the current value.

[0060] After the power generation device 11 is shut down, the control alarm sounds an alarm to alert the staff and promptly inform the staff that the power generation device 11 needs to be repaired and maintained.

[0061] In some examples, the controller includes: a first control module, which is used to control the bypass pressure reducing valve 15 and the alarm to operate, and control the power generation device 11 to shut down when the output current value is less than a first preset threshold value; a second control module, which is used to control the bypass pressure reducing valve 15 to shut down when the output current value is greater than the first preset threshold value and less than a second preset threshold value; a third control module, which is used to control the bypass pressure reducing valve 15 to operate when the output current value is greater than the second preset threshold value.

[0062] In this technical solution, the controller includes a first control module, a second control module and a third control module. After receiving the output current value, the controller compares the output current value with the first preset threshold value and the second preset threshold value respectively. If the output current value is less than the first preset threshold value, it means that the output current of the power generation device 11 is small, and the possibility of failure of the power generation device 11 is high. Therefore, the controller can call the first control module to control the operation of the bypass pressure reducing valve 15 to ensure the normal operation of the molten reduction furnace gas residual pressure power generation and gas fine desulfurization coupling system. At the same time, the power generation device 11 is controlled to be closed and the alarm is operated to promptly remind the staff to inspect the power generation device 11, which is conducive to improving the fault handling efficiency of the power generation device 11.

[0063] If the output current value is between the first preset threshold and the second preset threshold, it means that the output current of the power generation device 11 is in a normal state and the power generation device 11 is also in a normal working state, so that the controller can call the second control module and there is no need for the bypass pressure reducing valve 15 to assist the power generation device 11 to work. The controller can directly close the bypass pressure reducing valve 15 to reduce energy waste.

[0064] If the output current value is higher than the second preset threshold, it means that the output current of the power generation device 11 is large and the power generation device 11 may be in an overloaded state, so that the controller can call the third control module. The controller needs to open the bypass pressure reducing valve 15 to assist the power generation device 11 in reducing the pressure of the coal gas so that the coal gas can be desulfurized within a normal pressure range.

[0065] In some examples, the power generation device 11 includes: a gas turbine unit having a mechanical energy output end, the first gas input end and the first gas output end, the gas turbine unit is used to convert the pressure energy of the gas into mechanical energy; a power generation unit having a power input end, the power input end is connected to the mechanical energy output end.

[0066] In this technical solution, the power generation device 11 includes a gas turbine part and a power generation part. The gas turbine part has a mechanical energy output end, a first gas input end and a first gas output end. The gas turbine part converts the pressure energy of the gas received at the first gas input end into mechanical energy, and transmits the mechanical energy to the power input end of the power generation part through the mechanical energy output end. After receiving the mechanical energy, the power generation part converts the mechanical energy into electrical energy, and integrates the electrical energy into the power grid or transmits it to users, thereby realizing the recovery and utilization of the surplus energy of the gas.

[0067] like Figure 1 As shown, as a specific example of the smelting reduction furnace gas waste pressure power generation and coal gas fine desulfurization coupling system provided in the present application, the aforementioned smelting reduction furnace gas waste pressure power generation and coal gas fine desulfurization coupling system may include a smelting reduction furnace 10, a power generation device 11, a coal gas fine desulfurization device 12, a waste heat recovery device 13, a coal gas dust removal device 14, and a bypass pressure reducing valve 15.

[0068] Among them, the smelting reduction furnace 10 can generate high-temperature and high-pressure raw coal gas; the waste heat recovery device 13 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 13 includes the aforementioned coal gas channel and steam generating device, and the waste heat recovery device 13 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; coal gas dry dust removal facilities, the medium-temperature and high-pressure raw coal gas is purified by dry dust removal to become medium-temperature and high-pressure clean coal gas; the medium-temperature and high-pressure clean coal gas is further recovered by the power generation device 11. The waste energy of the medium-temperature and medium-pressure clean coal gas is converted into electrical energy through coal gas waste pressure power generation, and the obtained electrical energy It can be used to be connected to the power grid or transmitted to users, thereby realizing the recovery and utilization of surplus energy of coal gas. Accordingly, the medium-temperature and medium-pressure clean coal gas is converted into low-temperature and low-pressure clean coal gas; the bypass pressure reducing valve group includes a plurality of bypass pressure reducing valves 15 connected in parallel. When the power generation 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 bypass pressure reducing valve group connected in parallel with the power generation 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 power generation device 11 or the low-pressure and medium-temperature clean coal gas flowing out of the bypass pressure reducing valve group can enter the coal gas fine desulfurization facility, 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.

[0069] It is understandable that if Figure 1As shown, the aforementioned waste heat recovery device 13 is connected between the gas discharge end of the smelting reduction furnace 10 and the dry dust removal device 14; the dry dust removal device 14 is connected between the power generation device 11 and the waste heat recovery device 13; the first gas input end of the power generation device 11 is connected between the dry dust removal device 14 and the gas fine desulfurization device 12; the bypass pressure reducing valve group includes a plurality of bypass pressure reducing valves 15 in parallel, the third gas input end of the bypass pressure reducing valve 15 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 bypass pressure reducing valve 15 and the power generation device 11, and when the power generation device 11 fails, the gas fine desulfurization device 12 is connected to the bypass pressure reducing valve 15.

[0070] The present application provides a method for coupling power generation from coal gas residual pressure of a smelting reduction furnace 10 with coal gas fine desulfurization, the method comprising:

[0071] 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 ).

[0072] Step S2: The medium-temperature and high-pressure clean coal gas generated by the coal gas dry dust removal is further passed through the power generation device 11 to generate electric 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°C to 250°C, ≥0.08MPa, dust content ≤5mg / Nm 3 ), the medium temperature and high pressure clean coal gas is purified by the power generation 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 ).

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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 waste pressure power generation and gas fine desulfurization coupling system, characterized in that: The system comprises: A smelting reduction furnace having a gas discharge end; A power generation 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 power generation device is used to convert the pressure energy and thermal energy of the gas into electrical 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 waste pressure power generation and gas fine 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.

3. The smelting reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system according to claim 2 is characterized in that: The waste heat recovery device also includes: 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.

4. The smelting reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system according to claim 2 is characterized in that: Also includes: A coal gas dust removal device is connected between the waste heat recovery device and the first coal gas input end.

5. The smelting reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system according to claim 4 is characterized in that: The coal gas dust removal device is a dry dust removal device.

6. The smelting reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system according to claim 1 is characterized in that: Also includes: The bypass pressure reducing valve has a third gas input end and a third gas output end, wherein the third gas input end is communicated with the gas discharge end, and the third gas output end is communicated with the second gas input end.

7. The smelting reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system according to claim 6 is characterized in that: The number of the bypass pressure reducing valves is plural.

8. The smelting reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system according to claim 6 is characterized in that: Also includes: A controller, the bypass pressure reducing valve and the power generation device are both electrically connected to the controller; a detector, electrically connected to the controller, for obtaining an output current value of an electric energy output end of the power generation device; an alarm, electrically connected to the controller; Wherein, the controller is used to control the bypass pressure reducing valve, the power generation device and the alarm according to the output current value.

9. The smelting reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system according to claim 8 is characterized in that: The controller comprises: A first control module, used for controlling the bypass pressure reducing valve and the alarm to operate, and controlling the power generation device to shut down, when the output current value is less than a first preset threshold value; A second control module, configured to control the bypass pressure reducing valve to close when the output current value is greater than the first preset threshold value and less than a second preset threshold value; The third control module is used for, when the output current value is greater than a second preset threshold value, the controller controls the bypass pressure reducing valve to operate.

10. The smelting reduction furnace gas waste pressure power generation and gas fine desulfurization coupling system according to claim 1, characterized in that: The power generation device comprises: A gas turbine unit having a mechanical energy output end, the first gas input end and the first gas output end, the gas turbine unit being used for converting the pressure energy of the gas into mechanical energy; The power generation unit has a power input end, and the power input end is connected to the mechanical energy output end.

Images