Full-amount furnace top charging bucket gas recovery system

Abstract

The utility model discloses a full-amount furnace top charging bucket gas recovery system. The system comprises a furnace top charging bucket gas recovery device, and pressure-equalizing gas subjected to dust removal through the furnace top charging bucket gas recovery device is connected with a cloth bag dust removal system, a gas washing device and a low-pressure pipe network pressure-equalizing pipeline through pipelines and control valve groups respectively; and the control device is used for receiving the instruction and outputting a signal to the control valve group so as to control the pressure-equalized coal gas to enter the cloth bag dust removal system, the coal gas washing device and / or the low-pressure pipe network pressure-equalized pipeline. By means of the control valve group, pressure-equalizing coal gas can be controlled to selectively enter the dry dedusting system and the wet dedusting system according to local climate conditions, and a bypass enters a low-pressure coal gas pipe network; the appropriate one or two or three of the two or three of the two or three of the two or three of the two or three of the two or three of the two or three of the two or three of the three.

Description

Technical Field

[0001] The utility model relates to a full-volume furnace top material tank gas recovery system and method Background Art

[0002] In order to fully recover the pressure-equalizing gas in the blast furnace top tank, avoid energy waste and protect the atmospheric environment, various methods, devices and process technologies for recovering the pressure-equalizing gas from the blast furnace top have emerged.

[0003] For example, a Chinese patent (CN116891918A) discloses a gas recovery system, in which the gas from the pressure-equalizing gas recovery device enters the desulfurization tower together with the low-pressure gas (about 12 kPa) from the TRT (or the gas bypass to the pressure regulating valve group after the TRT is shut down) after heat exchange, and is sent to the low-pressure pipeline network after desulfurization. 3 Taking blast furnace as an example, the hourly instantaneous recovery flow rate is 65000m3 and the hourly average recovery flow rate is 2000m3. 3 ) and higher recovery pressure (4700m 3 Take the blast furnace as an example, the pressure is about 280kPa). When the higher pressure gas and the low pressure blast furnace gas enter the desulfurization tower together, it will have a serious impact on the production conditions and flow field of the desulfurization tower, thereby affecting the stability of the desulfurization tower. In addition, the patent does not involve the full recovery of the pressure gas in the tank.

[0004] For example, a Chinese patent (CN220056911U) discloses a gas recovery system, in which the semi-clean gas from the pressure-equalizing recovery system and the gas from the blast furnace gas treatment system are sent to a scrubber together, and the scrubbed gas is sent to the low-pressure gas network in the plant area. This recovery system is prone to problems such as ice blockage of pipelines and scrubbers in the northeast and other severely cold regions in winter, and has certain limitations.

[0005] For example, Chinese patent (CN116334330A) discloses a blast furnace equalized pressure gas full recovery system and method. This patent is essentially similar to patent CN220056911U. Both recover the equalized pressure gas using a wet scrubbing method. The difference is that CN116334330A adds a full recovery venturi tube and arranges it in the tower.

[0006] For example, Chinese patent (CN219507951U) discloses a blast furnace tank pressure-equalized gas recovery device, in which the pressure-equalized gas from the blast furnace tank is sent to the gas network through a primary pressure-equalizing valve, gas inlet and outlet pipes, gas storage tanks and a water washing system. At the end of the recovery period, when the tank pressure is low, it is sent to the gas network after being processed through a secondary recovery valve, a venturi tube and a dehydrator. The limitation of this patent is that due to the low temperature of the pressure-equalized gas (generally 60-80°C), the independent dust removal device is not suitable for use in the Northeast and other severely cold regions in winter.

[0007] For example, Chinese patent (CN218932200U) discloses a buffer dust removal tank for pressure-equalized gas dry recovery, which divides the dry dust removal system into two zones: a buffer zone and a dust removal zone. Since the pressure-equalized gas temperature is relatively low (generally 60-80°C), it is easy to condense and stick to the bag, and cannot be set up separately and dusted normally, which is especially not suitable for cold regions.

[0008] For example, the Chinese patent (CN115948628B) discloses a blast furnace gas dry dust removal device and method with a two-stage pressure balance system. The patent adopts an independent pressure-equalizing gas bag dust removal cylinder, and uses the high-pressure clean gas at the dry dust removal outlet as the pulse back-blowing gas source. The back-blowing pressure relief pipeline is connected to the clean gas pipeline at the outlet of the pressure-equalizing box and enters the low-pressure pipe network system. The patent still uses an independent pressure-equalizing gas bag dust removal cylinder. Based on the low temperature of the pressure-equalizing gas (generally 60-80°C), the independent dust removal box is difficult to operate normally in the cold northern regions due to gas condensation and sticking to the bag.

[0009] For example, the Chinese patent (CN219195010U) discloses a blast furnace top pressure-equalizing gas recovery device, in which the pressure-equalizing gas from the furnace top material tank passes through the primary separation tank and the secondary separation tank, enters the independent bag filter and the buffer tank, and is then sent to the low-pressure pipe network. Due to the low temperature of the pressure-equalizing gas (generally 60-80°C), the independent dust removal box is difficult to operate normally in the cold northern regions due to gas condensation and sticking to the bag.

[0010] For example, the Chinese patent (CN115652001A) discloses a blast furnace top pressure-equalizing gas recovery system, which is arranged next to the furnace top pressure-equalizing gas release system, including a recovery pipeline, an ejector, a buffer bag dust collector, and a low-pressure clean plant area gas main network, which are sequentially connected to the furnace top pressure-equalizing gas release system tank through pipelines. Similarly, due to the low temperature of the pressure-equalizing gas (generally 60-80°C), it is easy to condense and stick to the bag, and cannot be dusted normally, which is especially not suitable for severe cold areas. Other related patents also have the problem of winter adaptability in severe cold areas. Utility Model Content

[0011] In order to solve the above problems, the purpose of this utility model is to provide a full-scale furnace top tank gas recovery system

[0012] In order to achieve the above-mentioned purpose, the utility model provides a full-volume furnace top tank gas recovery system, including a furnace top tank gas recovery device, wherein the pressure-equalized gas after dust removal by the top tank gas recovery device is connected to a bag dust removal system, a gas washing device and a low-pressure pipe network pressure-equalizing pipe through a pipe and a control valve group;

[0013] A control device is used to receive instructions and output signals to the control valve group to control the pressure-equalizing gas to enter the bag dust removal system, the gas washing device and / or the pressure-equalizing pipeline of the low-pressure pipe network.

[0014] Furthermore, the furnace top tank gas recovery device includes a furnace top tank, a cyclone dust collector and a control valve group; the pressure-equalized gas from the furnace top tank is dedusted by the cyclone dust collector and then enters the full recovery and ejection system through the control valve group.

[0015] Furthermore, the full recovery and ejection system comprises a pressure-equalizing gas recovery main pipeline and a pressure-equalizing gas recovery bypass pipeline; a pressure-equalizing gas ejector is arranged on the pressure-equalizing gas recovery bypass pipeline;

[0016] The dust-removed pressure-equalized gas is sent to the pressure-equalized gas recovery main pipeline and the pressure-equalized gas recovery bypass pipeline;

[0017] When the pressure of the furnace top tank drops to a predetermined pressure, the pressure equalizing gas ejector is started to fully recover the remaining gas in the furnace top tank through ejection.

[0018] Furthermore, the gas washing device includes a washing tower; the pressure-equalized gas enters the washing tower and passes through the distributor, and then passes through the high-pressure water mist spray washing and the demister, and then enters the low-pressure gas pipeline network through the isolation valve group.

[0019] Furthermore, it also includes a gravity dust collector connected to the top of the blast furnace through a pipeline, and the high-pressure semi-clean coal gas after dust removal by the gravity dust collector is transported to the bag dust removal system through the pipeline.

[0020] Furthermore, the bag dust removal system includes more than two bag dust collectors, an inlet isolation valve group and an outlet isolation valve group; the equalized pressure gas and high-pressure semi-clean blast furnace gas enter the two dust collectors of the bag dust removal system for dust removal, and then enter the high-pressure clean gas pipeline through the isolation valve group.

[0021] Furthermore, the coal gas in the high-pressure clean coal gas pipeline enters the low-pressure pipeline network after passing through the residual pressure power generation device or the pressure regulating valve group.

[0022] Furthermore, the high-pressure clean gas pipeline is connected to the pressure-equalizing gas ejector via a control valve group.

[0023] In order to achieve the above-mentioned purpose, the method for fully recovering the coal gas from the furnace top tank of the utility model comprises the following steps:

[0024] The pressure-equalized gas after dust removal by the gas recovery device in the furnace top tank is connected to the bag dust removal system, the gas washing device and the pressure-equalizing pipeline of the low-pressure pipe network through pipelines and control valve groups;

[0025] According to the regional climate differences, seasonal differences, and dust content differences, the pressure-equalizing gas is controlled to enter the bag dust removal system, the gas washing device, and / or the low-pressure network pressure-equalizing pipeline.

[0026] Furthermore, the method also includes: when the pressure of the furnace top tank exceeds a predetermined pressure, the dust-removed equalized pressure gas is sent to the equalized pressure gas recovery main pipeline; when the pressure of the furnace top tank drops to a predetermined pressure, the equalized pressure gas ejector is started to fully recover the remaining gas in the furnace top tank through the equalized pressure gas recovery bypass pipeline.

[0027] The utility model can control the pressure-equalizing gas to selectively enter the dry dust removal system, the wet dust removal system, or the bypass to enter the low-pressure gas network according to the local climatic conditions through the control valve group; it can select a suitable one, or two or three of them according to the local climatic conditions. It can solve the problem that the single bag dust removal is easy to be blocked by gas condensation due to the low temperature of the pressure-equalizing gas, and the dry dust removal can be used to purify the pressure-equalizing gas, which is more conducive to environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the utility model's process for fully recovering the coal gas from the furnace top tank.

[0029] Description of reference numerals:

[0030] Furnace top tank gas recovery device 1, furnace top tank 101, cyclone dust collector 102; full recovery and injection system 2, equalized pressure gas recovery main pipeline 201, equalized pressure gas recovery bypass pipeline 202, equalized pressure gas ejector 203, high-pressure clean gas isolation valve group 204; bag dust removal system 3, bag dust removal 301, semi-clean gas dust collector inlet isolation valve group 302, equalized pressure gas dust collector inlet isolation valve group 303, clean gas dust collector outlet isolation valve group 303; gas washing device 4, washing tower 401, equalized pressure gas washing tower inlet isolation valve group 402, water pump 4 03; blast furnace gas excess pressure power generation and pressure regulating valve group system 5, excess pressure power generation device 501, pressure regulating valve group 502, excess pressure power generation inlet isolation valve group 503, excess pressure power generation outlet isolation valve group 504; equalized pressure gas recovery pipeline 6, equalized pressure pipeline to bag dust removal 7, equalized pressure pipeline to washing tower 8, equalized pressure pipeline to low-pressure pipeline network 9, high-pressure semi-clean gas main pipe 10, high-pressure clean gas main pipe 11, high-pressure clean gas pipe to equalized pressure injection 12, low-pressure gas pipeline network 13; equalized pressure washing grid-connected isolation valve group 14, equalized pressure bypass grid-connected isolation valve group 15, low-pressure gas grid-connected isolation valve group 16. DETAILED DESCRIPTION

[0031] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0032] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship 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.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example 1

[0036] The full-scale furnace top tank gas recovery system of this embodiment includes a furnace top tank gas recovery device. The pressure-equalized gas after dust removal by the top tank gas recovery device is connected to the bag dust removal system, the gas washing device and the low-pressure pipe network pressure-equalizing pipe through pipelines and control valve groups respectively;

[0037] A control device is used to receive instructions and output signals to the control valve group to control the pressure-equalizing gas to enter the bag dust removal system, the gas washing device and / or the pressure-equalizing pipeline of the low-pressure pipe network.

[0038] The above-mentioned embodiment drives the control valve group through the control device, and can control the equalized pressure gas to selectively enter the dry dust removal system, the wet dust removal system, and the bypass into the low-pressure gas pipeline network according to the local climatic conditions; a suitable one can be selected according to the local climatic conditions, or two or three of them can be selected.

[0039] Example 2

[0040] As a further improvement of the above embodiment, the above furnace top tank gas recovery device includes a furnace top tank, a cyclone dust collector and its control valve group; the pressure-equalized gas from the furnace top tank enters the full recovery and injection system through the control valve group after being dusted by the cyclone dust collector. The full recovery and injection system includes a pressure-equalized gas recovery main pipeline and a pressure-equalized gas recovery bypass pipeline; a pressure-equalized gas ejector is provided on the pressure-equalized gas recovery bypass pipeline;

[0041] The dust-removed pressure-equalized gas is sent to the pressure-equalized gas recovery main pipeline and the pressure-equalized gas recovery bypass pipeline;

[0042] When the pressure of the furnace top tank drops to a predetermined pressure, the pressure equalizing gas ejector is started to fully recover the remaining gas in the furnace top tank through ejection.

[0043] Example 3

[0044] As shown in the figure, this embodiment includes: a furnace top tank 101 installed on the blast furnace top platform, a cyclone dust collector 102 connected to the furnace top tank 101 through a pipeline, and a recovery pipe network below the dust collector, and the pressure-equalized gas after dust removal is sent to the pressure-equalized gas recovery main pipeline 201 and the pressure-equalized gas recovery bypass pipeline 202. The pressure-equalized gas recovery main pipeline 201 is responsible for the early recovery of the pressure-equalized tank gas. When the pressure of the tank drops to a lower level in the later stage of recovery, the system switches to the pressure-equalized gas ejector 203 of the pressure-equalized gas recovery bypass pipeline 202, and uses the high-pressure gas of the high-pressure clean gas pipe 12 to eject the remaining gas in the tank 101 through the ejector 203 and then send it to the pressure-equalized gas recovery pipeline 6 for full recovery.

[0045] The equalized pressure gas from the equalized pressure gas recovery pipeline 6 and the high-pressure semi-clean gas from the high-pressure semi-clean gas main pipe 10 enter the bag dust collector 301 through the isolation valve groups 302 and 303, and after dust removal, enter the high-pressure clean gas main pipe 11 through the isolation valve group 304, and enter the low-pressure gas pipeline network 13 after passing through the blast furnace gas residual pressure power generation 501 or the pressure regulating valve group 502 and the isolation valve group 15.

[0046] The characteristics of this embodiment are that the pressure and temperature of the semi-clean blast furnace gas from the gravity dust collector are relatively high (at 4700m 3 For example, the blast furnace has a temperature of 280 kPa and a temperature of 250 °C, while the temperature of the gas recovered under equal pressure is lower (4700 m 3 Take the blast furnace as an example, ~280kPa, ~80℃), the instantaneous amount is large, and the average amount is small (4700m 3 Taking the blast furnace pressure recovery gas as an example, the hourly instantaneous recovery flow rate is ~65000m 3 , hourly average recovery flow rate ~ 2000m 3, 12 times / h, 10-15 seconds / time), when the high-pressure semi-clean gas and the equalized-pressure gas are simultaneously sent into the dry dust removal box (with a diameter of about 5-6m), the dry dust removal system can be used as a buffer container, and the problem of the single bag dust removal being easily blocked by condensation of gas due to the low temperature of the equalized-pressure gas can be solved. In addition, the dry dust removal can be used to purify the equalized-pressure gas, which is more conducive to environmental protection.

[0047] Example 4

[0048] As shown in the figure, this embodiment includes: a furnace top tank 101 installed on the blast furnace top platform, a cyclone dust collector 102 connected to the furnace top tank 101 through a pipeline, and a recovery pipe network below the dust collector, and the pressure-equalized gas after dust removal is sent to the pressure-equalized gas recovery main pipeline 201 and the pressure-equalized gas recovery bypass pipeline 202. The pressure-equalized gas recovery main pipeline 201 is responsible for the early recovery of the pressure-equalized tank gas. When the pressure of the tank drops to a lower level in the later stage of recovery, the system switches to the pressure-equalized gas ejector 203 of the pressure-equalized gas recovery bypass pipeline 202, and uses the high-pressure gas of the high-pressure clean gas pipe 12 to eject the remaining gas in the tank 101 through the ejector 203 and then send it to the pressure-equalized gas recovery pipeline 6 for full recovery.

[0049] The equalized gas from the equalized gas recovery pipeline 6 enters the washing tower 401 through the isolating valve group 402. The equalized gas enters the lower part of the washing tower 401, passes through the distributor and the packing layer, and contacts the washing water from the dual-fluid nozzle. The washed equalized gas enters the low-pressure gas pipeline 13 after passing through the isolating valve group 14 and the isolating valve group 15.

[0050] The feature of this embodiment is that the pressure-equalized recovered coal gas enters the washing tower 401 for washing, and the washing tower can be used as a buffer container to purify the pressure-equalized coal gas, thereby further reducing the dust content and chloride ion content of the recovered coal gas.

[0051] Example 5

[0052] As shown in the figure, this embodiment includes: a furnace top tank 101 installed on the blast furnace top platform, a cyclone dust collector 102 connected to the furnace top tank 101 through a pipeline, and a recovery pipe network below the dust collector, and the pressure-equalized gas after dust removal is sent to the pressure-equalized gas recovery main pipeline 201 and the pressure-equalized gas recovery bypass pipeline 202. The pressure-equalized gas recovery main pipeline 201 is responsible for the early recovery of the pressure-equalized tank gas. When the pressure of the tank drops to a lower level in the later stage of recovery, the system switches to the pressure-equalized gas ejector 203 of the pressure-equalized gas recovery bypass pipeline 202, and uses the high-pressure gas of the high-pressure clean gas pipe 12 to eject the remaining gas in the tank 101 through the ejector 203 and then send it to the pressure-equalized gas recovery pipeline 6 for full recovery.

[0053] The equalized pressure gas from the equalized pressure gas recovery pipeline 6 to the low-pressure network equalized pressure pipeline 9 enters the blast furnace gas residual pressure power generation 501 and the low-pressure gas pipeline after the pressure regulating valve group 502 through the isolation valve group 16, and is connected to the low-pressure gas network 13.

[0054] The characteristics of this embodiment are: since the dust content of the pressure-equalized gas is not high and the temperature is relatively low (60-80°C), the bypass into the low-pressure clean gas network will not have a significant impact on the dust content of the low-pressure clean gas network, and avoid the dry dust removal and wet dust removal processes that are not suitable for independent use in cold regions, greatly reducing the investment in equipment, and is particularly suitable for my country's Northeast and Northwest cold regions. 3 Taking the blast furnace as an example, the pressure-equalized gas volume after cyclone dust removal is 2000Nm 3 / h, the dust content is generally 100~300mg / Nm 3 , blast furnace gas output is about 700000Nm 3 / h. After the pressure-equalized gas directly enters the low-pressure clean gas network, the dust content is reduced from the original 5mg / Nm 3 Increased to 5.27-5.84 mg / Nm 3 , increased by 0.27~0.84~mg / Nm 3 , which has almost no effect on the quality of clean gas. At the same time, due to the small average hourly recovery volume of equalized pressure gas, compared with the large-capacity low-pressure gas pipeline system, the pressure fluctuation of the low-pressure gas pipeline system is slightly affected by the mixing of equalized pressure gas.

[0055] In the implementation of the above three embodiments, a suitable one can be selected according to the local climate conditions, or two or three can be selected. When two or three are selected, the isolation valve group 303, the isolation valve group 402 or the isolation valve group 16 can be switched to select a suitable operation according to the season and ambient temperature.

[0056] The utility model is described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the utility model. Many other changes and modifications that do not depart from the concept and scope of the utility model should be considered as the protection scope of the utility model.

[0057] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0058] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A full-scale furnace top tank gas recovery system, characterized by: The system includes a furnace top tank gas recovery device, and the pressure-equalized gas after dust removal by the top tank gas recovery device is connected to the bag dust removal system, the gas washing device and the low-pressure pipe network pressure-equalizing pipe through pipelines and control valve groups respectively; A control device is used to receive instructions and output signals to the control valve group to control the pressure-equalizing gas to enter the bag dust removal system, the gas washing device and / or the pressure-equalizing pipeline of the low-pressure pipe network.

2. The full-scale furnace top tank gas recovery system according to claim 1, characterized in that: The furnace top tank gas recovery device comprises a furnace top tank, a cyclone dust collector and a control valve group thereof; the pressure-equalized gas from the furnace top tank is dust-removed by the cyclone dust collector and then enters the full recovery and ejection system through the control valve group.

3. The full furnace top tank gas recovery system according to claim 2, characterized in that: The full recovery and ejection system comprises a pressure-equalizing gas recovery main pipeline and a pressure-equalizing gas recovery bypass pipeline; a pressure-equalizing gas ejector is arranged on the pressure-equalizing gas recovery bypass pipeline; The dust-removed pressure-equalized gas is sent to the pressure-equalized gas recovery main pipeline and the pressure-equalized gas recovery bypass pipeline; When the pressure of the furnace top tank drops to a predetermined pressure, the pressure equalizing gas ejector is started to fully recover the remaining gas in the furnace top tank through ejection.

4. The full-scale furnace top tank gas recovery system according to claim 1, characterized in that: The gas washing device includes a washing tower; the pressure-equalized gas enters the washing tower and passes through a distributor, a high-pressure water mist spray washing and a demister, and then enters the low-pressure gas network through a blocking valve group.

5. The full furnace top tank gas recovery system according to claim 1, characterized in that: It also includes a gravity dust collector connected to the top of the blast furnace through a pipeline. The high-pressure semi-clean coal gas after dust removal by the gravity dust collector is transported to the bag dust removal system through the pipeline.

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