Total-amount recovery device for furnace top charging bucket gas

Abstract

The utility model discloses a full-amount recovery device for furnace top charging bucket gas. Comprising a furnace top charging bucket gas recovery device, a gravity dust collector and a bag-type dust collection system, wherein the pressure-equalized coal gas dedusted by the furnace top charging bucket coal gas recovery device and the high-pressure semi-clean coal gas dedusted by the gravity dust remover are conveyed to the bag dust removal system through a pipeline. By utilizing the characteristics that the pressure and the temperature of the semi-clean blast furnace gas from the gravity dust collector are higher, and the temperature, the instantaneous quantity and the average quantity of the pressure-equalizing recovered gas are lower, the high-pressure semi-clean gas and the pressure-equalizing gas are simultaneously fed into the dry-method dust collection box body by utilizing the dry-method dust collection box body; a dry dedusting system can be used as a buffer container, the problem that a bag is easy to paste due to coal gas condensation in independent bag dedusting due to low temperature of the pressure-equalizing coal gas can be solved, the pressure-equalizing coal gas can be purified by dry dedusting, and environmental protection is facilitated.

Description

Technical Field

[0001] The utility model relates to a device for fully recovering coal gas from a furnace top material tank. 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 overcome the above-mentioned defects, the purpose of the utility model is to provide a device for fully recovering coal gas from a furnace top tank in a severely cold region, which can adapt to the problems in severely cold regions.

[0012] In order to achieve the above-mentioned purpose, the utility model provides a full-amount recovery device for the coal gas from the furnace top tank, which is characterized by comprising a coal gas recovery device for the furnace top tank, a gravity dust collector and a bag dust removal system; wherein, the equalized-pressure coal gas after dust removal by the coal gas recovery device for the furnace top tank and the high-pressure semi-clean coal gas after dust removal by the gravity dust collector are transported to the bag dust removal system through pipelines.

[0013] 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 in 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.

[0014] 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;

[0015] The dust-removed pressure-equalized gas is sent to the pressure-equalized gas recovery main pipeline and the pressure-equalized gas recovery bypass pipeline;

[0016] 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.

[0017] 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.

[0018] 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.

[0019] Furthermore, the high-pressure clean gas pipeline is connected to the pressure-equalizing gas ejector via a control valve group.

[0020] Furthermore, the furnace top material tank gas recovery device includes two cyclone dust collectors.

[0021] The utility model utilizes the characteristics that the pressure and temperature of the semi-clean blast furnace gas from the gravity dust collector are relatively high, while the temperature of the pressure-equalized recovered gas is relatively low, the instantaneous amount is relatively large, and the average amount is relatively small. When the high-pressure semi-clean gas and the pressure-equalized gas are simultaneously sent into the dry dust removal box by using a dry dust removal box, the dry dust removal system can be used as a buffer container, and the problem that the temperature of the pressure-equalized gas is low and the separate bag dust collector is prone to sticking due to condensation of the gas can be solved. In addition, the pressure-equalized gas can be purified by dry dust removal, which is more conducive to environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic diagram of a device for fully recovering coal gas from a furnace top tank.

[0023] Description of reference numerals:

[0024] Blast furnace 1, raw gas riser 2, gravity dust collector 3, semi-clean gas pipeline 4, furnace top tank gas recovery device 5, furnace top tank 501, cyclone dust collector 502, full recovery injection system 6, pressure-equalizing gas recovery main pipeline 601, pressure-equalizing gas recovery bypass pipeline 602, pressure-equalizing gas injector 603, high-pressure clean gas isolation valve group 604, pressure-equalizing injection high-pressure clean gas pipe 7, pressure-equalizing gas return Collecting pipeline 8, bag dust removal and pressure equalizing pipeline 9, bag dust removal system 10, bag dust removal 1001, semi-clean gas dust collector inlet isolation valve group 1002, pressure equalizing gas dust collector inlet isolation valve group 1003, clean gas dust collector outlet isolation valve group 1004, high-pressure clean gas main pipe 11, residual pressure power generation device 12, pressure regulating valve group 13, low-pressure gas pipeline network 14, isolation valve group before low-pressure gas pipeline is connected to the grid. DETAILED DESCRIPTION

[0025] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0026] 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 directions or positional relationships, are based on the directions 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0027] 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.

[0028] 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.

[0029] Example 1

[0030] The full-amount coal gas recovery device for the furnace top tank in this embodiment comprises a furnace top tank gas recovery device 5, a gravity dust collector 3 and a bag dust removal system; wherein, the equalized-pressure coal gas after dust removal by the furnace top tank gas recovery device and the high-pressure semi-clean coal gas after dust removal by the gravity dust collector are transported to the bag dust removal system through pipelines.

[0031] This embodiment utilizes the characteristics that the pressure and temperature of the semi-clean blast furnace gas from the gravity dust collector are relatively high, while the temperature of the pressure-equalized recovered gas is relatively low, the instantaneous amount is relatively large, and the average amount is relatively small. When the high-pressure semi-clean gas and the pressure-equalized gas are simultaneously sent into the dry dust removal box by using a dry dust removal box, the dry dust removal system can be used as a buffer container, and the problem that the temperature of the pressure-equalized gas is low and the separate bag dust collector is prone to sticking due to condensation of the gas can be solved. In addition, the pressure-equalized gas can be purified by dry dust removal, which is more conducive to environmental protection.

[0032] Example 2

[0033] As a further improvement of the above embodiment, 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 in the furnace top tank enters the full recovery and ejection system through the control valve group after being dusted by the cyclone dust collector;

[0034] The full recovery and ejection system comprises a pressure-equalizing gas recovery main pipeline 601 and a pressure-equalizing gas recovery bypass pipeline 602; a pressure-equalizing gas ejector 604 is provided on the pressure-equalizing gas recovery bypass pipeline;

[0035] The dust-removed pressure-equalized gas is sent to the pressure-equalized gas recovery main pipeline and the pressure-equalized gas recovery bypass pipeline;

[0036] 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.

[0037] Example 3

[0038] As a further improvement of the above embodiment, 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 both 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.

[0039] Example 4

[0040] Figure 1The best embodiment of the utility model is shown, and the embodiment includes: a furnace top tank 501 installed on the blast furnace top platform, a cyclone dust collector 502 connected to the furnace top tank 501 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 601 and the pressure-equalized gas recovery bypass pipeline 602. The pressure-equalized gas recovery main pipeline 601 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 603 of the pressure-equalized gas recovery bypass pipeline 602, and uses the high-pressure gas of the pressure-equalized ejection high-pressure clean gas pipe 7 to eject the remaining gas in the tank 501 through the ejector 603 and then send it to the pressure-equalized gas recovery pipeline 8 for full recovery.

[0041] The equalized pressure gas from the equalized pressure gas recovery pipeline 8 and the high-pressure semi-clean gas from the high-pressure semi-clean gas main pipe 4 enter the bag dust collector 1001 through the isolation valve groups 1002 and 1003. After dust removal, the high-pressure clean gas enters the high-pressure clean gas main pipe 11 through the isolation valve group 1004, and enters the low-pressure gas pipeline network 14 after passing through the blast furnace gas residual pressure power generation 12 or the pressure regulating valve group 13 and the isolation valve group 15.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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 device for recovering the full amount of coal gas from a furnace top tank, characterized in that: It includes a furnace top tank gas recovery device, a gravity dust collector and a bag dust removal system; wherein, the equalized pressure gas after dust removal by the furnace top tank gas recovery device and the high-pressure semi-clean gas after dust removal by the gravity dust collector are transported to the bag dust removal system through pipelines.

2. The furnace top tank gas full recovery device 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 in 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 furnace top tank gas full recovery device 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 furnace top tank gas full recovery device according to claim 2, characterized in that: 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.

5. The furnace top tank gas full recovery device according to claim 4, characterized in that: The coal gas in the high-pressure clean coal gas pipeline enters the low-pressure pipe network after passing through the residual pressure power generation device or the pressure regulating valve group.

6. The furnace top tank gas full recovery device according to claim 4, characterized in that: The high-pressure clean gas pipeline is connected to the pressure-equalizing gas ejector via a control valve group.

7. The furnace top tank gas full recovery device according to claim 2, characterized in that: The furnace top material tank gas recovery device includes two cyclone dust collectors.

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