Low-temperature waste gas recovery sealing device for blast furnace airtight box

Abstract

The utility model discloses a low-temperature waste gas recovery sealing device for a blast furnace airtight box, which relates to the technical field of blast furnace smelting and comprises a cooling water tank, a gas storage tank and an airtight box, an air inlet pipe is arranged on one side of the airtight box; the system further comprises a public waste gas pipeline which is provided with a waste gas recovery pipe. The waste gas recovery pipe sequentially communicates with the cooling water tank, the gas storage tank and the gas inlet pipe; a booster pump is arranged on the waste gas recovery pipe at the bottom of the cooling water tank; an oxygen detector is arranged at the bottom of the booster pump; a first gas stop valve is arranged on the waste gas recovery pipe at the top of the cooling water tank. According to the device, low-temperature waste gas generated by the hot blast stove in the public waste gas pipeline can be recycled, the recycled inert gas is used for carrying out airtight cooling on the airtight box, original nitrogen is replaced, energy consumption is reduced, the energy utilization efficiency is improved, and the nitrogen cost of blast furnace production is saved; and meanwhile, unorganized carbon emission of a blast furnace system is reduced, and bad influences on the environment are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace smelting, in particular to a low-temperature waste gas recovery and sealing device for a blast furnace airtight box. Background Art

[0002] In modern blast furnace ironmaking, small and medium-sized blast furnaces are generally equipped with three hot blast furnaces, while large blast furnaces are equipped with four hot blast furnaces. The hot blast furnaces use the high-temperature exhaust gas generated by coal gas combustion to heat the checker bricks inside the regenerator, and the low-temperature exhaust gas is directly discharged into the air.

[0003] In the related art, in order to protect mechanical devices such as gears in the airtight box from being damaged by the high-temperature coal gas and dust on the furnace top, it is necessary to use inert gases such as nitrogen to airtightly cool the airtight box. During smelting, a large amount of inert gases such as nitrogen is required for airtight cooling of the airtight box, resulting in a high cost of the inert gas. The main components of low-temperature exhaust gas are nitrogen and carbon dioxide, which have the characteristics of inert gases. However, they are directly discharged into the air without recycling the gas, resulting in energy waste. In addition, direct discharge has a severe impact on the environment. Utility Model Content

[0004] The utility model aims to provide a low-temperature exhaust gas recovery and sealing device for a blast furnace airtight box, so as to solve at least one aspect of the problems and defects raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A low-temperature waste gas recovery and sealing device for a blast furnace airtight box, comprising:

[0007] Cooling water tanks, gas storage tanks and airtight boxes;

[0008] An air inlet pipe is provided on one side of the airtight box;

[0009] It also includes a public exhaust gas pipeline, on which an exhaust gas recovery pipe is provided;

[0010] The exhaust gas recovery pipe is connected to the cooling water tank, the air storage tank and the air intake pipe in sequence;

[0011] A booster pump is provided on the exhaust gas recovery pipe at the bottom of the cooling water tank, and an oxygen detector is provided at the bottom of the booster pump;

[0012] A first gas shut-off valve is arranged on the waste gas recovery pipe at the top of the cooling water tank.

[0013] The low-temperature exhaust gas recovery and sealing device for the blast furnace airtight box according to this scheme has at least the following technical effects:

[0014] The low-temperature exhaust gas recovery sealing device for the blast furnace airtight box is provided with an exhaust gas recovery pipe on the common exhaust gas pipeline, and is sequentially connected to a cooling water tank, an air storage tank and an air inlet pipe, so that the exhaust gas recovery pipe recovers the low-temperature exhaust gas generated by the hot blast furnace in the common exhaust gas pipeline, and uses the recovered inert gas stored in the air storage tank to perform airtight cooling on the airtight box to replace the original nitrogen, thereby reducing energy consumption, improving energy utilization efficiency, and saving nitrogen costs for blast furnace production; at the same time, reducing the unorganized carbon emissions of the blast furnace system and avoiding adverse effects on the environment.

[0015] As a further solution of the utility model: a CO detector is also provided on the exhaust gas recovery pipe at the bottom of the cooling water tank.

[0016] Since a CO detector is also provided on the waste gas recovery pipe at the bottom of the cooling water tank, the CO concentration of the low-temperature waste gas in the public waste gas pipeline is detected. The waste gas that meets the CO concentration standard is recovered by opening the first gas shut-off valve. If the CO concentration exceeds the standard, the hot air furnace process is adjusted to reduce the CO concentration. The waste gas is recovered after the CO detector detects that the waste gas meets the standard.

[0017] As a further solution of the utility model: a water inlet pipe is arranged on one side of the cooling water tank, and a water outlet pipe is arranged on the other side.

[0018] Since a water inlet pipe is provided on one side of the cooling water tank and a water outlet pipe is provided on the other side, the cooling water in the cooling water tank can circulate faster to keep the temperature inside the cooling water tank stable, so that when the low-temperature exhaust gas passes through the cooling water tank, the cooling speed of the low-temperature exhaust gas can be accelerated, so that the cooled low-temperature exhaust gas can be recovered into the gas storage tank and used as a cooling medium to perform airtight cooling on the airtight box.

[0019] As a further solution of the utility model: a temperature measuring thermocouple and a pressure gauge are provided on one side of the gas storage tank.

[0020] By setting a temperature measuring thermocouple and a pressure gauge on one side of the gas tank, the temperature of the gas in the gas tank is measured to meet the gas temperature requirement for airtight cooling. If the gas temperature is higher than the standard, the water flow rate in the cooling water tank is increased to accelerate the cooling of the gas. At the same time, the gas pressure in the gas tank is monitored in real time through the pressure gauge. When the gas in the gas tank reaches the working pressure, the gas is used to perform airtight cooling on the airtight box. If the gas pressure in the gas tank is insufficient, nitrogen is transported through the air inlet pipe on one side of the airtight box to perform airtight cooling on the airtight box.

[0021] As a further solution of the utility model: a second gas shut-off valve is provided on the waste gas recovery pipe at the top of the gas storage tank.

[0022] By setting a second gas shut-off valve on the waste gas recovery pipe on the top of the gas tank, the gas delivery is controlled by the second gas shut-off valve to ensure that the gas in the gas tank meets the delivery standards and that the gas delivery is smooth. At the same time, when the gas is insufficient or an unexpected situation occurs, the gas delivery can be quickly cut off to ensure the safety of equipment and personnel.

[0023] As a further solution of the utility model: a flow meter is also provided on the exhaust gas recovery pipe on the top of the gas storage tank.

[0024] Since a flow meter is also provided on the exhaust gas recovery pipe on the top of the gas storage tank, the gas flow rate of the exhaust gas transportation can be accurately monitored to ensure that the gas transportation flow rate reaches the airtight cooling standard of the airtight box, thereby avoiding excessive or insufficient gas flow, resulting in energy waste or failure to achieve optimal airtight cooling conditions, thereby improving the airtight cooling efficiency of the airtight box.

[0025] As a further solution of the utility model: a third gas shut-off valve is provided on the air intake pipe.

[0026] By arranging a third gas shut-off valve on the air inlet pipe, the nitrogen delivery can be turned on and off. When the gas in the gas tank is needed to airtightly cool the airtight box, the second gas shut-off valve is opened, and the third gas shut-off valve is closed, and there is no need to use nitrogen. When the gas pressure in the gas tank is insufficient or the gas temperature is too high, the second gas shut-off valve is closed and the third gas shut-off valve is opened. The airtight box is airtightly cooled by delivering nitrogen, which helps the flexibility of gas delivery and work continuity.

[0027] As a further solution of the utility model: a chimney is provided at one end of the common exhaust gas pipeline.

[0028] Since a chimney is set at one end of the public exhaust gas pipeline, when the low-temperature exhaust gas from the hot blast furnace enters the public exhaust gas pipeline, an oxygen detector is used to detect whether the residual oxygen content of the exhaust gas meets the recycling standards. If it meets the recycling standards, the exhaust gas is recovered into the gas storage tank through the exhaust gas recovery pipe, while the exhaust gas that does not meet the recycling standards is directly discharged through the chimney. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0030] Figure 1 The present invention is a structural schematic diagram of a low-temperature waste gas recovery and sealing device for a blast furnace airtight box.

[0031] Reference numerals:

[0032] 101. Cooling water tank; 102. Gas storage tank; 103. Airtight box; 104. Air inlet pipe; 105. Public exhaust pipe; 106. Exhaust gas recovery pipe; 107. Booster pump; 108. Oxygen detector; 109. First gas shut-off valve; 110. CO detector; 111. Water inlet pipe; 112. Water outlet pipe; 113. Temperature measuring thermocouple; 114. Pressure gauge; 115. Second gas shut-off valve; 116. Flow meter; 117. Third gas shut-off valve; 118. Chimney. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0039] like Figure 1 The embodiment of the utility model shown is a low-temperature waste gas recovery and sealing device for a blast furnace airtight box, comprising: a cooling water tank 101, a gas storage tank 102 and an airtight box 103; an air inlet pipe 104 is arranged on one side of the airtight box 103; it also includes a common waste gas pipeline 105, on which a waste gas recovery pipe 106 is arranged; the waste gas recovery pipe 106 is connected to the cooling water tank 101, the gas storage tank 102 and the air inlet pipe 104 in sequence; a booster pump 107 is arranged on the waste gas recovery pipe 106 at the bottom of the cooling water tank 101, and an oxygen detector 108 is arranged at the bottom of the booster pump 107; a first gas shut-off valve 109 is arranged on the waste gas recovery pipe 106 at the top of the cooling water tank 101.

[0040] When in use, the hot blast furnace utilizes the high-temperature exhaust gas generated by the combustion of coal gas to heat the checker bricks inside the heat storage chamber, and the low-temperature exhaust gas enters the common exhaust gas pipe 105. The residual oxygen content of the exhaust gas in the common exhaust gas pipe 105 is detected by the oxygen detector 108. When the residual oxygen content is less than 3%, the first gas shut-off valve 109 and the booster pump 107 are opened to recover the gas in the common exhaust gas pipe 105; when the residual oxygen content is greater than 3%, the hot blast furnace process is adjusted until the residual oxygen content of the exhaust gas is less than 3%, ensuring that the recovered inert gas meets the use standard; after the gas is cooled by the circulating water in the cooling water tank 101, it enters the gas storage tank 102 for storage and airtight cooling in the airtight box 103.

[0041] Specifically, the low-temperature exhaust gas recovery sealing device for the blast furnace airtight box is provided with an exhaust gas recovery pipe 106 on the common exhaust gas pipeline 105, and is connected in sequence to a cooling water tank 101, an air storage tank 102 and an air inlet pipe 104, so that the exhaust gas recovery pipe 106 can recover the low-temperature exhaust gas generated by the hot blast furnace in the common exhaust gas pipeline, and use the recovered inert gas stored in the air storage tank 102 to airtightly cool the airtight box 103 to replace the original nitrogen, thereby reducing energy consumption, improving energy utilization efficiency, and saving nitrogen costs for blast furnace production; at the same time, reducing the unorganized carbon emissions of the blast furnace system and avoiding adverse effects on the environment.

[0042] like Figure 1 As shown, a CO detector 110 is also provided on the exhaust gas recovery pipe 106 at the bottom of the cooling water tank 101 .

[0043] Specifically, since a CO detector 110 is also provided on the waste gas recovery pipe 106 at the bottom of the cooling water tank 101, the CO concentration of the low-temperature waste gas in the common waste gas pipe 105 is detected, and the waste gas that meets the CO concentration standard is recovered by opening the first gas shut-off valve 109. If the CO concentration exceeds the standard, the hot air furnace process is adjusted to reduce the CO concentration, and the waste gas is recovered after the waste gas is detected by the CO detector 110 to meet the standard.

[0044] like Figure 1 As shown, a water inlet pipe 111 is provided on one side of the cooling water tank 101, and a water outlet pipe 112 is provided on the other side.

[0045] Specifically, since a water inlet pipe 111 is provided on one side of the cooling water tank 101 and a water outlet pipe 112 is provided on the other side, the cooling water in the cooling water tank 101 can circulate faster, keeping the temperature inside the cooling water tank 101 stable, so that when the low-temperature exhaust gas passes through the cooling water tank 101, the cooling speed of the low-temperature exhaust gas can be accelerated, thereby recovering the cooled low-temperature exhaust gas into the gas storage tank 102 and using it as a cooling medium to perform airtight cooling on the airtight box 102.

[0046] like Figure 1 As shown, a temperature measuring thermocouple 113 and a pressure gauge 114 are provided on one side of the gas storage tank 102 .

[0047] Specifically, by arranging a temperature measuring thermocouple 113 and a pressure gauge 114 on one side of the gas tank 102, the temperature of the gas in the gas tank 102 is measured to meet the gas temperature requirement for airtight cooling. If the gas temperature is higher than the standard, the water flow rate in the cooling water tank 101 is increased to accelerate the cooling of the gas. At the same time, the gas pressure in the gas tank 102 is monitored in real time through the pressure gauge 114. When the gas in the gas tank 102 reaches the working pressure, the gas is used to perform airtight cooling on the airtight box 103. If the gas pressure in the gas tank 102 is insufficient, nitrogen is transported through the air inlet pipe 104 on one side of the airtight box 103 to perform airtight cooling on the airtight box 103.

[0048] According to an embodiment of the present utility model, a second gas shut-off valve 115 is provided on the waste gas recovery pipe 106 at the top of the gas storage tank 102 .

[0049] Specifically, by setting a second gas shut-off valve 115 on the waste gas recovery pipe 106 at the top of the gas tank 102, the second gas shut-off valve 115 is used to control the on and off of gas delivery, ensuring that the gas in the gas tank 102 meets the delivery standards and that the gas delivery is smooth. At the same time, when the gas is insufficient or an unexpected situation occurs, the gas delivery can be quickly cut off to ensure the safety of equipment and personnel.

[0050] According to an embodiment of the present utility model, a flow meter 116 is further provided on the exhaust gas recovery pipe 106 at the top of the gas storage tank 102 .

[0051] Specifically, since a flow meter 116 is also provided on the exhaust gas recovery pipe 106 at the top of the gas storage tank 102, the gas flow rate of the exhaust gas transportation can be accurately monitored to ensure that the gas transportation flow rate reaches the airtight cooling standard of the airtight box 103, avoid excessive or insufficient gas flow, cause energy waste or fail to achieve the optimal airtight cooling conditions, and improve the airtight cooling efficiency of the airtight box 103.

[0052] like Figure 1 As shown, a third gas shut-off valve 117 is provided on the air intake pipe 104 .

[0053] Specifically, by providing a third gas shut-off valve 117 on the air inlet pipe 104, the nitrogen delivery can be turned on and off. When the gas in the gas tank 102 is needed to airtightly cool the airtight box 103, the second gas shut-off valve 115 is opened, and the third gas shut-off valve 117 is closed, and there is no need to use nitrogen. When the gas pressure in the gas tank 102 is insufficient or the gas temperature is too high, the second gas shut-off valve 115 is closed and the third gas shut-off valve 117 is opened. By delivering nitrogen, the airtight box 103 is airtightly cooled, which helps the flexibility of gas delivery and the continuity of work.

[0054] It should also be noted that a chimney 118 is provided at one end of the common exhaust gas pipe 105 .

[0055] Specifically, since a chimney 118 is provided at one end of the common waste gas pipe 105, when the low-temperature waste gas from the hot blast furnace enters the common waste gas pipe 105, the oxygen detector 108 is used to detect whether the residual oxygen content of the waste gas meets the recycling standards. If it meets the recycling standards, the waste gas is recovered into the gas storage tank 102 through the waste gas recovery pipe 106, while the waste gas that does not meet the recycling standards is directly discharged through the chimney 118.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" 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 utility model. 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.

[0057] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A low-temperature waste gas recovery sealing device for a blast furnace airtight box, characterized in that: include: A cooling water tank (101), a gas storage tank (102) and an airtight box (103); An air inlet pipe (104) is provided on one side of the airtight box (103); It also includes a common waste gas pipeline (105), wherein the common waste gas pipeline (105) is provided with a waste gas recovery pipe (106); The waste gas recovery pipe (106) is sequentially connected to the cooling water tank (101), the gas storage tank (102) and the air intake pipe (104); A booster pump (107) is provided on the waste gas recovery pipe (106) at the bottom of the cooling water tank (101), and an oxygen detector (108) is provided at the bottom of the booster pump (107); A first gas shut-off valve (109) is provided on the waste gas recovery pipe (106) at the top of the cooling water tank (101).

2. The low-temperature waste gas recovery sealing device for a blast furnace airtight box according to claim 1 is characterized in that: A CO detector (110) is also provided on the waste gas recovery pipe (106) at the bottom of the cooling water tank (101).

3. The low-temperature waste gas recovery sealing device for a blast furnace airtight box according to claim 1, characterized in that: The cooling water tank (101) is provided with a water inlet pipe (111) on one side and a water outlet pipe (112) on the other side.

4. The low-temperature waste gas recovery sealing device for a blast furnace airtight box according to claim 1, characterized in that: A temperature measuring thermocouple (113) and a pressure gauge (114) are provided on one side of the gas storage tank (102).

5. The low-temperature waste gas recovery sealing device for a blast furnace airtight box according to claim 4, characterized in that: A second gas shut-off valve (115) is provided on the waste gas recovery pipe (106) at the top of the gas storage tank (102).

6. The low-temperature waste gas recovery and sealing device for a blast furnace airtight box according to claim 5, characterized in that: A flow meter (116) is also provided on the waste gas recovery pipe (106) at the top of the gas storage tank (102).

7. The low-temperature waste gas recovery and sealing device for a blast furnace airtight box according to claim 6, characterized in that: The air inlet pipe (104) is provided with a third gas shut-off valve (117).

8. The low-temperature waste gas recovery and sealing device for a blast furnace airtight box according to any one of claims 1 to 7, characterized in that: A chimney (118) is provided at one end of the common exhaust gas pipe (105).

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