Device for fully recovering furnace top pressure-equalizing diffused coal gas

Abstract

The utility model relates to a device for fully recovering furnace top pressure-equalizing diffused coal gas, which comprises a furnace top charging bucket, the furnace top charging bucket is respectively connected with a high-temperature high-pressure coal gas main pipe, a main diffusing pipe and a diffused coal gas pressure-equalizing pipe, the diffused coal gas pressure-equalizing pipe is connected with a dust remover, and the rear end of the dust remover is connected into a coal gas pipe network through a clean coal gas pipe; a first ejector is arranged on a diffused coal gas pressure equalizing pipe at the front end of the dust remover, an ejection port of the first ejector is connected with a high-temperature and high-pressure coal gas main pipe through an ejection pipeline I, a second ejector is arranged on a clean coal gas pipe at the rear end of the dust remover, and an ejection port of the second ejector is connected with the high-pressure coal gas main pipe through an ejection pipeline II. According to the device, furnace top pressure-equalizing gas and damping-down gas can be completely recovered, so that the problem of gas diffusion to the air is solved, and environmental pollution caused by pressure-equalizing diffusion and damping-down is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of iron and steel industry, and particularly relates to a device for fully recovering the equalizing and discharging gas at the top of a furnace. Background Technique

[0002] At present, blast furnaces generally adopt high-pressure operation and often take measures such as spraying water to cool down to protect the top equipment during the blast furnace shutdown process. These have led to a situation where the pressure of the discharged gas at the top of the furnace is high and the temperature is relatively low. It is precisely under this background that many recovery technologies have emerged. However, some of these technologies are difficult to be widely promoted due to price issues, overly complex operation and maintenance, or concerns about the impact on production.

[0003] The main working mode of the current blast furnace equalizing and discharging pressure system is as follows: when preparing to add materials to the top charging hopper, the gas in the top charging hopper is discharged to the atmosphere until the pressure in the hopper is the same as the atmospheric pressure, and then materials are added to the hopper; when the materials in the hopper are about to enter the furnace, the equalizing system uses equalizing gas to pressurize the hopper until the pressure in the hopper is equal to the pressure in the furnace, and then materials are added to the furnace. Usually, this process requires two equalizing operations. One equalizing operation uses clean gas or semi-clean gas, and the second equalizing operation uses nitrogen. Patent CN201410274381.2, a process method and device for forcibly recovering blast furnace discharged gas, proposes a method for gas recovery. This method realizes the goal of recovering 90% of the discharged gas by adding ejectors and fans, achieving economic benefits while protecting the environment. To promote the development of technology, especially to ensure the full recovery of the equalizing gas at the top of the furnace and the gas during the shutdown process, and to solve a series of technical problems such as low gas temperature, pressure impact on the clean gas pipeline network caused by the recovered gas, low dust removal efficiency, and low recovery rate, it is particularly necessary to develop a new gas recovery process. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a device for fully recovering the equalizing and discharging gas at the top of a furnace, which can not only improve the gas recovery efficiency of the blast furnace charging hopper but also solve the problem of forced discharge of blast furnace gas with low temperature under accident conditions, thereby achieving the full recovery of the discharged gas.

[0005] To achieve the above object, the utility model is realized by adopting the following technical solutions:

[0006] A device for fully recovering and equalizing the pressure of the gas discharged from the top of the furnace includes a top charging hopper of the furnace. The top charging hopper is respectively connected to a high-temperature and high-pressure gas main pipe, a main discharge pipe, and a pressure-equalizing discharge gas pipe. The pressure-equalizing discharge gas pipe is connected to a dust collector, and the rear end of the dust collector is connected to the gas pipe network through a clean gas pipe; a first ejector is provided on the pressure-equalizing discharge gas pipe at the front end of the dust collector, and the ejector port of the first ejector is connected to the high-temperature and high-pressure gas main pipe through an ejector pipe 1. A second ejector is provided on the clean gas pipe at the rear end of the dust collector, and the ejector port of the second ejector is connected to the high-pressure gas main pipe through an ejector pipe 2.

[0007] Pressure relief valve groups are provided on the high-temperature and high-pressure gas main pipe, the main discharge pipe, and the pressure-equalizing discharge gas pipe.

[0008] Nitrogen purging valve groups are provided on the ejector pipe 1, the pressure-equalizing discharge gas pipe, the ejector pipe 2, and the clean gas pipe.

[0009] Gas ejector valves are provided on the ejector pipe 1 and the ejector pipe 2.

[0010] Compared with the existing technology, the beneficial effects of the present utility model are as follows:

[0011] 1. Ejectors are respectively provided on the pressure-equalizing pipeline for discharging the blast furnace gas and the clean gas pipe at the rear end of the dust collector. Ensure the full recovery of the discharged gas.

[0012] 2. The first ejector uses high-temperature and high-pressure clean gas as the ejector fluid, which increases the temperature and pressure of the gas discharged during the blast furnace shutdown in the process of ejecting the discharged gas, ensuring that the low-temperature gas during the blast furnace shutdown can also be fully recovered and finally enters the dust collector.

[0013] 3. The top pressure-equalizing gas and the gas discharged during the blast furnace shutdown can be fully recovered, which not only solves the problem of discharging the gas into the air but also eliminates environmental pollution caused by pressure equalization and blast furnace shutdown. The control is simple and convenient, especially it can increase the temperature of the low-temperature discharged gas. It has special significance for extending the service life of the gas pressure-equalizing equipment and promoting the gas discharge and recovery technology. Brief Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the present utility model.

[0015] In the figure: top charging hopper 1, high-temperature and high-pressure gas main pipe 2, main discharge pipe 3, pressure-equalizing discharge gas pipe 4, dust collector 5, clean gas pipe 6, gas pipe network 7, first ejector 8, ejector pipe 1 9, second ejector 10, ejector pipe 2 11, high-pressure gas main pipe 12, pressure relief valve group 13, nitrogen purging valve group 14, gas ejector valve 15. Detailed Embodiment

[0016] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0017] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "plural" is more than two.

[0018] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" 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 mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.

[0019] Such as Figure 1 , a device for evenly pressing and discharging gas at the top of a fully recycled furnace, including a top charging hopper 1. The top charging hopper 1 is respectively connected to a high-temperature and high-pressure gas main pipe 2, a main discharge pipe 3, and a discharge gas equalizing pipe 4. The discharge gas equalizing pipe 4 is connected to a dust collector 5, and the rear end of the dust collector 5 is connected to a gas pipe network 7 through a clean gas pipe 6; a first ejector 8 is provided on the discharge gas equalizing pipe 4 at the front end of the dust collector 5, and the ejector port of the first ejector 8 is connected to the high-temperature and high-pressure gas main pipe 2 through an ejector pipe 9. A second ejector 10 is provided on the clean gas pipe 6 at the rear end of the dust collector 5, and the ejector port of the second ejector 10 is connected to a high-pressure gas main pipe 12 through an ejector pipe 11.

[0020] Pressure relief valve groups 13 are provided on the high-temperature and high-pressure gas main pipe 2, the main discharge pipe 3, and the discharge gas equalizing pipe 4.

[0021] Nitrogen purge valve groups 14 are provided on the ejector pipe 9, the discharge gas equalizing pipe 4, the ejector pipe 11, and the clean gas pipe 6 to ensure safety.

[0022] The gas ejecting valves 15 are provided on both the ejecting pipeline 1 9 and the ejecting pipeline 2 11.

[0023] The working process of the device for fully recovering the top-pressure equalizing and discharging gas of the blast furnace: The raw gas discharged during the blast furnace shutdown and the top-pressure equalizing and discharging process of the top bin enters the discharging gas equalizing pipe 4 through the pressure discharging valve group 12, and then enters the first ejector 8. The first ejector 8 introduces high-temperature and high-pressure gas from the ejecting port to eject the raw gas in the top bin 1 of the blast furnace. In the first ejector 8, the high-temperature and high-pressure clean gas and the raw gas are mixed to form a mixed gas that meets the temperature requirement of the dust collector 5. After being purified by the dust collector 5, it enters the second ejector 10. The second ejector 10 introduces high-pressure gas from the ejecting port, and uses the micro-negative pressure generated by the high-pressure gas to attract the purified clean gas. In the second ejector 10, the high-pressure gas and the clean gas are mixed, and finally enter the gas pipeline network 7 through the clean gas pipe 6.

[0024] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention. In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods. In addition, any combination can be made between various different embodiments of the present invention as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

[0025] To make the purpose, technical solution and technical effect of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. However, the embodiments described below are only a part of the embodiments of the present invention, not all of the embodiments. Combining the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0026] Embodiment

[0027] A device for fully recovering and equalizing the pressure of the gas discharged from the top of the furnace includes a top charging hopper 1, which is respectively connected to a high-temperature and high-pressure gas main pipe 2, a main discharge pipe 3, and a gas equalizing pipe 4 for discharging gas. Pressure relief valve groups 13 are provided on the high-temperature and high-pressure gas main pipe 2, the main discharge pipe 3, and the gas equalizing pipe 4 for discharging gas. The gas equalizing pipe 4 for discharging gas is connected to a dust collector 5, and the rear end of the dust collector 5 is connected to a gas pipe network 7 through a clean gas pipe 6; a first ejector 8 is provided on the gas equalizing pipe 4 for discharging gas at the front end of the dust collector 5, and the ejector port of the first ejector 8 is connected to the high-temperature and high-pressure gas main pipe 2 through an ejector pipe 9. A second ejector 10 is provided on the clean gas pipe 6 at the rear end of the dust collector 5, and the ejector port of the second ejector 10 is connected to a high-pressure gas main pipe 12 through an ejector pipe 11.

[0028] Nitrogen purging valve groups 14 are provided on the ejector pipe 9, the gas equalizing pipe 4 for discharging gas, the ejector pipe 11, and the clean gas pipe 6 to ensure safety.

[0029] Gas ejector valves 15 are provided on both the ejector pipe 9 and the ejector pipe 11.

[0030] To ensure stable charging of the top charging hopper 1, the gas in the hopper needs to be discharged before charging. The specific operation of equalizing the pressure and discharging the gas from the top charging hopper is as follows: When discharging, first open the pressure relief valve group 13 on the gas equalizing pipe 4 for discharging gas, and at the same time cut off the high-temperature and high-pressure gas main pipe 2 and the main discharge pipe 3 to ensure that the discharged gas only passes through the top discharge gas pipeline 4. At this time, the ejector pipe 9 and the ejector pipe 11 are in a closed state. The discharged gas enters the dust collector 5 after passing through multiple control valves. After dust removal in the dust collector 5, the discharged gas becomes clean gas and is connected to the gas pipe network 7 through the clean gas pipe 6. When the gas pressure decreases close to the gas pressure in the whole plant's clean gas pipe network during the later stage of discharging, the discharged gas cannot be naturally recovered, and at this time, high-temperature and high-pressure gas is needed to eject the discharged gas from the blast furnace.

[0031] The first ejector 8 on the ejector pipe 9 at the front end of the dust collector 5 injects the high-temperature and high-pressure gas at 140 °C and 0.206 MPa in the high-temperature and high-pressure gas main pipe 2 into the ejector port through the gas ejector valve 15. The second ejector 10 on the ejector pipe 11 at the rear end of the dust collector 5 injects the high-pressure gas at 0.206 MPa in the high-pressure gas main pipe 12 into the ejector port through the gas ejector valve 15, thereby forming a negative pressure in the cavity through the high-speed flowing gas and ejecting the remaining discharged gas in the top charging hopper 1. Finally, this part of the gas also enters the dust collector 5 for dust removal and then enters the gas pipe network 7, thus achieving the full recovery of the discharged gas.

[0032] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and basic spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A device for fully recovering furnace top pressure-equalizing and dispersing coal gas, characterized in that: It includes a furnace top material tank, which is respectively connected to the high-temperature and high-pressure gas main, the main vent pipe and the vent gas equalizing pipe. The vent gas equalizing pipe is connected to the dust collector, and the rear end of the dust collector is connected to the gas network through a clean gas pipe. A first ejector is provided on the vent gas equalizing pipe at the front end of the dust collector, and the ejection port of the first ejector is connected to the high-temperature and high-pressure gas main through an ejection pipe one. A second ejector is provided on the clean gas pipe at the rear end of the dust collector, and the ejection port of the second ejector is connected to the high-pressure gas main through an ejection pipe two.

2. The device for fully recovering furnace top pressure-equalizing and releasing coal gas according to claim 1 is characterized in that: The high-temperature and high-pressure gas main pipe, the main discharge pipe and the discharge gas pressure equalizing pipe are all provided with a pressure relief valve group.

3. The device for fully recovering furnace top pressure-equalizing and releasing coal gas according to claim 1 is characterized in that: The first ejector pipe, the gas venting pressure equalizing pipe, the second ejector pipe and the clean gas pipe are all provided with a nitrogen purge valve group.

4. The device for fully recovering furnace top pressure-equalizing and releasing coal gas according to claim 1 is characterized in that: The first and second ejection pipes are both provided with gas ejection valves.

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