Blast furnace top pressure-equalizing coal gas recycling and metering device

Abstract

The utility model relates to the technical field of ironmaking blast furnace gas recovery. The utility model discloses a blast furnace top pressure-equalizing gas recycling and metering device which comprises a blast furnace, and further comprises a pressure-equalizing pipeline, a weighing charging bucket, a pressure discharging pipeline, a gas purifying unit and a purified gas pipeline which are connected in sequence, the weighing charging bucket is arranged at the top of the blast furnace; a first pressure sensor and a first temperature sensor are mounted on the weighing material tank; a second pressure sensor and a second temperature sensor are mounted on the coal gas purification unit; a pressure equalizing valve is arranged on the pressure equalizing pipeline; and a pressure relief valve is arranged on one side, close to the weighing material tank, of the pressure relief pipeline. The blast furnace top pressure-equalized gas recovery metering device is reasonable in structure, can accurately calculate the recovery amount of the furnace top pressure-equalized gas, and avoids data errors and equipment damage caused by the use of a flow meter.

Description

Technical Field

[0001] The utility model relates to the technical field of ironmaking blast furnace gas recovery, in particular to a blast furnace top pressure-equalizing gas recovery metering device. Background Art

[0002] During the normal production of blast furnace ironmaking, the blast furnace gas discharged from the material tank when the furnace top is loaded is called equalized pressure gas. The equalized pressure gas on the furnace top necessary for blast furnace production is released into the atmosphere before each loading. The equalized pressure gas is a toxic and combustible mixed gas containing a large amount of carbon monoxide, carbon dioxide and dust. These released gases seriously pollute the atmospheric environment. Blast furnace gas is an important secondary energy source for steel enterprises. At present, in the metallurgical industry, blast furnace top equalized pressure gas recovery devices are widely used. In order to facilitate the calculation of gas recovery, the industry often uses the method of installing flow meters for measurement. Prior art CN211199258U discloses a blast furnace top tank pressure-equalizing gas full recovery system, including a tank, a pressure-equalizing system, a venting system, and a recovery system. The recovery system includes a first recovery pipeline and a second recovery pipeline connected by a sixth pipeline, and the first recovery pipeline and the second recovery pipeline are connected to a third recovery pipeline. The sixth pipeline is provided with a shut-off valve II and a control valve I. The first recovery pipeline is provided with a pipeline valve I, and the second recovery pipeline is provided with a drainage device. The third recovery pipeline is provided with a flow meter I, a shut-off valve III, a maintenance valve I, a dust removal device II, a compensation recovery device, a butterfly valve II, a blind plate valve II, and a low-pressure clean gas pipeline network in sequence, and a compensation pressure-equalizing device is provided on the sixth pipeline. The beneficial effect of the utility model is that the gas in the pipeline can flow smoothly and be fully recycled. Although the blast furnace pressure-equalizing gas recovery system can solve the problem of difficult blast furnace gas recovery, in production practice, the existing system has the following deficiencies in measuring the amount of blast furnace gas recovery:

[0003] 1. The flow meter range used in existing devices is generally large, resulting in low measurement accuracy. In addition, blast furnace gas contains many impurities and is easy to crystallize. Impurities condense on the sensor head, which can easily cause measurement inaccuracy.

[0004] 2. The flow meter is affected by impurities in the coal gas, which can easily cause equipment damage, high maintenance costs, and affect the normal production of the blast furnace.

[0005] Therefore, it is urgent to study and improve the existing problems and provide a blast furnace top equalized pressure gas recovery and metering device. Utility Model Content

[0006] The utility model aims to solve at least one of the technical problems raised in the above-mentioned background technology, and provides a blast furnace top pressure-equalized gas recovery metering device, which has a reasonable structure, can realize accurate calculation of the recovery amount of the furnace top pressure-equalized gas, avoids data errors and equipment damage caused by the use of flow meters, and has good economic benefits and industrial application potential.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is:

[0008] A blast furnace top pressure-equalizing gas recovery and metering device comprises a blast furnace, and also comprises a pressure-equalizing pipeline, a weighing tank, a pressure-relief pipeline, a gas purification unit and a clean gas pipeline connected in sequence; the weighing tank is arranged on the top of the blast furnace; the weighing tank is equipped with a first pressure sensor and a first temperature sensor; the gas purification unit is equipped with a second pressure sensor and a second temperature sensor; the pressure-equalizing pipeline is provided with a pressure-equalizing valve; the pressure-relief pipeline is provided with a pressure-relief valve on the side close to the weighing tank.

[0009] As a further improvement of the utility model, a first shut-off valve is provided on the side of the pressure relief pipe close to the gas purification unit; a second shut-off valve is provided on the clean gas pipe; and the gas purification unit is connected to the clean gas main through the clean gas pipe.

[0010] As a further improvement of the utility model, the pressure equalizing valve, the pressure relief valve, the first cut-off valve and the second cut-off valve are all solenoid valves.

[0011] As a further improvement of the present invention, it also includes a controller, and the first pressure sensor, the first temperature sensor, the second pressure sensor, the second temperature sensor, the pressure equalizing valve, the pressure relief valve, the first cut-off valve and the second cut-off valve are all connected to the controller.

[0012] As a further improvement of the present invention, the gas purification unit includes a dust removal tank and a bag rack fixedly installed in the middle of the dust removal tank, a gas inlet is opened at the lower part of the dust removal tank, and a gas outlet is opened at the upper part. The gas inlet of the dust removal tank is connected to the pressure relief pipe, and the gas outlet of the dust removal tank is connected to the clean gas pipe.

[0013] As a further improvement of the utility model, a weighing device is provided in the weighing material tank.

[0014] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0015] The utility model discloses a blast furnace top pressure-equalized gas recovery metering device, which is used to measure the pressure value in the weighing material pipe by installing a first pressure sensor and a first temperature sensor on the weighing material tank, and to measure the pressure value in the gas purification unit by installing a second pressure sensor and a second temperature sensor on the gas purification unit, and to calculate the total volume of the pressure-equalized gas recovery amount by using the corresponding pressure-equalized gas recovery amount calculation formula. The utility model can improve the measurement accuracy of the pressure-equalized gas recovery amount on the furnace top by measuring the pressure and temperature in the weighing material tank and the gas purification unit, and using a pressure sensor and a temperature sensor instead of a flow meter, thereby avoiding data errors and equipment damage caused by the use of a flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a blast furnace top pressure equalizing gas recovery and metering device proposed by the utility model;

[0017] Among them, the markings in the attached figure are: 1, blast furnace; 2, pressure equalizing pipeline; 3, weighing material tank; 4, pressure discharge pipeline; 5, dust removal tank; 6, clean gas pipeline; 7, first pressure sensor; 8, first temperature sensor; 9, second pressure sensor; 10, second temperature sensor; 11, pressure equalizing valve; 12, pressure discharge valve; 13, first shut-off valve; 14, second shut-off valve; 15, bag rack; 16, clean gas main; DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does 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 of the present utility model; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0020] See also Figure 1 A blast furnace 1 top pressure-equalizing gas recovery and metering device comprises a blast furnace 1, and also comprises a pressure-equalizing pipeline 2, a weighing tank 3, a pressure-discharging pipeline 4, a gas purification unit and a clean gas pipeline 6 connected in sequence; the weighing tank 3 is arranged on the top of the blast furnace 1; the weighing tank 3 is provided with a first pressure sensor 7 and a first temperature sensor 8; the gas purification unit is provided with a second pressure sensor 9 and a second temperature sensor 10; the pressure-equalizing pipeline 2 is provided with a pressure-equalizing valve 11; the pressure-discharging pipeline 4 is provided with a pressure-discharging valve 12 on the side close to the weighing tank 3;

[0021] A first shut-off valve 13 is provided on the pressure relief pipe 4 at one side close to the gas purification unit; a second shut-off valve 14 is provided on the clean gas pipe 6 ; and the gas purification unit is connected to the clean gas main 16 via the clean gas pipe 6 .

[0022] As a further improvement of the present invention, a controller is also included, and the first pressure sensor 7, the first temperature sensor 8, the second pressure sensor 9, the second temperature sensor 10, the pressure equalizing valve 11, the pressure relief valve 12, the first cut-off valve 13 and the second cut-off valve 14 are all connected to the controller. The circuit connection relationship between the first pressure sensor 7, the first temperature sensor 8, the second pressure sensor 9, the second temperature sensor 10, the pressure equalizing valve 11, the pressure relief valve 12, the first cut-off valve 13 and the second cut-off valve 14 and the controller is the prior art and will not be repeated here to save space.

[0023] The pressure equalizing valve 11 , the pressure relief valve 12 , the first shut-off valve 13 , and the second shut-off valve 14 are all solenoid valves, which are connected to a controller, and the controller controls the switching of the solenoid valves.

[0024] As a further improvement of the present invention, the gas purification unit includes a dust removal tank 5 and a bag rack 15 fixedly installed in the middle of the dust removal tank 5. The dust removal tank 5 is provided with a gas inlet at the bottom and a gas outlet at the top. The gas inlet of the dust removal tank 5 is connected to the pressure relief pipe 4, and the gas outlet of the dust removal tank 5 is connected to the clean gas pipe 6.

[0025] As a further improvement of the present invention, a weighing device is provided in the weighing tank 3 .

[0026] When the system is working, first, the weighing tank 3 is loaded with materials of preset weight, and then the pressure equalizing valve 11 on the pressure equalizing pipe 2 is opened to input the pressure equalizing gas into the weighing tank 3. When the pressure in the weighing tank 3 is balanced with the furnace top pressure, the pressure equalizing valve 11 is closed, and the materials in the weighing tank 3 are dropped into the blast furnace 1 to complete the charging. After the charging is completed, the pressure relief valve 12 and the first shut-off valve 13 are opened, and the pressure equalizing gas in the weighing tank 3 enters the dust removal tank 5. After the bag dust removal by the bag layer 15, the second shut-off valve 14 is opened, and the pressure equalizing gas is discharged from the gas outlet at the top of the dust removal tank 5 through the clean gas pipeline 6 to the clean gas main 16 for recycling, so as to reduce the pollution of pressure equalizing gas emission.

[0027] The working principle of the blast furnace 1 top pressure-equalizing gas recovery metering device of the utility model is as follows: firstly, the first pressure sensor 7, the first temperature sensor 8, the second pressure sensor 9, and the second temperature sensor 10 are used to obtain relevant detection data respectively, and the data are summarized to the controller; then the controller calculates the volume of the top pressure-equalizing gas recovery amount according to the pressure-equalizing gas recovery amount calculation formula. The specific calculation method is:

[0028] (1) First, the pressure value P1 in the weighing tank 3 is measured by the first pressure sensor 7, and the temperature value T1 in the weighing tank 3 is measured by the first temperature sensor 8; after the gas recovery is completed, the pressure data P2 in the gas purification unit is measured by the second pressure sensor 9, and the temperature data T2 in the gas purification unit is measured by the second temperature sensor 10;

[0029] (2) The calculation formula of the pressure-equalized gas recovery volume V is: V = V2-V1, that is:

[0030]

[0031] Among them, N is the number of material tanks on the furnace top, i is a positive integer from 1 to N; P1 and T1 are the state pressure and temperature data of the recovery starting point of weighing material tank 3, respectively, and P2 and T2 are the state pressure and temperature data of the recovery end point of the gas purification unit, respectively. 标They are respectively atmospheric pressure 0.1MPa and absolute temperature 273°C; V1 is the effective volume of the weighing tank 3, which is a constant; and V2 is the total volume of the weighing tank after pressure relief.

[0032] The above description is a detailed description of the preferred feasible embodiment of the utility model, but the embodiment is not used to limit the scope of the patent application of the utility model. All equivalent changes or modified changes completed under the technical spirit suggested by the utility model should fall within the patent scope covered by the utility model.

Claims

1. A blast furnace top pressure equalizing gas recovery metering device, comprising a blast furnace (1), characterized in that: The invention also comprises a pressure equalizing pipeline (2), a weighing tank (3), a pressure relief pipeline (4), a gas purification unit and a clean gas pipeline (6) which are connected in sequence; the weighing tank (3) is arranged on the top of the blast furnace (1); a first pressure sensor (7) and a first temperature sensor (8) are installed on the weighing tank (3); a second pressure sensor (9) and a second temperature sensor (10) are installed on the gas purification unit; a pressure equalizing valve (11) is provided on the pressure equalizing pipeline (2); and a pressure relief valve (12) is provided on the side of the pressure relief pipeline (4) close to the weighing tank (3).

2. A blast furnace (1) top pressure equalizing gas recovery and metering device according to claim 1, characterized in that: A first shut-off valve (13) is provided on the side of the pressure relief pipeline (4) close to the gas purification unit; a second shut-off valve (14) is provided on the clean gas pipeline (6); and the gas purification unit is connected to the clean gas main (16) via the clean gas pipeline (6).

3. A blast furnace (1) top pressure equalizing gas recovery and metering device according to claim 2, characterized in that: The pressure equalizing valve (11), the pressure relief valve (12), the first shut-off valve (13), and the second shut-off valve (14) are all solenoid valves.

4. A blast furnace (1) top pressure equalizing gas recovery and metering device according to claim 2, characterized in that: It also comprises a controller, wherein the first pressure sensor (7), the first temperature sensor (8), the second pressure sensor (9), the second temperature sensor (10), the pressure equalizing valve (11), the pressure relief valve (12), the first shut-off valve (13) and the second shut-off valve (14) are all connected to the controller.

5. A blast furnace (1) top pressure equalizing gas recovery and metering device according to claim 1, characterized in that: The gas purification unit comprises a dust removal tank (5) and a bag layer rack (15) fixedly mounted in the middle of the dust removal tank (5); a gas inlet is provided at the bottom of the dust removal tank (5) and a gas outlet is provided at the top; the gas inlet of the dust removal tank (5) is connected to the pressure relief pipe (4), and the gas outlet of the dust removal tank (5) is connected to the clean gas pipe (6).

6. A blast furnace (1) top pressure equalizing gas recovery and metering device according to claim 1, characterized in that: The weighing tank (3) is provided with a weighing device.

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