Automatic temperature adjusting device for flue gas purification of submerged arc furnace

Abstract

The utility model provides an automatic temperature adjusting device for flue gas purification of a submerged arc furnace. The automatic temperature adjusting device comprises a first-stage cooler, a second-stage cooler, a third-stage cooler and a fourth-stage cooler, wherein an air inlet is formed in the lower end of the first-stage cooler, and an air outlet is formed in the top end of the first-stage cooler; a gas inlet of the first-stage cooler is connected with a flue gas outlet of the submerged arc furnace, and a gas outlet of the first-stage cooler is connected with gas inlets of the second-stage cooler, the third-stage cooler and the fourth-stage cooler through gas inlet branch pipes; an air outlet of the second-stage cooler is respectively connected with air inlets of the third-stage cooler and the fourth-stage cooler through air inlet branch pipes; and an air outlet of the third-stage cooler is connected with an air inlet of the fourth-stage cooler through an air inlet branch pipe. According to the utility model, the flue gas of the submerged arc furnace at different temperatures is cooled in different stages through the multi-stage cooler, so that the temperature of the flue gas entering the bag-type dust collector is effectively reduced, dust and tar in the flue gas are prevented from being separated out in a large amount in a concentrated manner, and the whole purification system can operate continuously and stably.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of the smelter flue gas purification, specifically relates to a temperature automatic regulating device for smelter flue gas purification. BACKGROUND

[0002] The temperature fluctuation range of the raw smoke generated by the smelter is large, usually 400 DEG C-1000 DEG C, and the highest temperature resistance of the dust cloth bag can only reach 280 DEG C, so the high-temperature dust-containing furnace gas needs to be cooled, and the cooled furnace gas is sent to the dust removal equipment for dust removal treatment, if the furnace gas temperature is high, the filter bag in the dust removal equipment is damaged, leading to the failure of the whole purification system.

[0003] The cooling system under the prior art does not have regulating capacity, and the purification system is designed according to the highest temperature, when the temperature is low, the temperature of the flue gas entering the bag filter is lower than 200 DEG C after being cooled by the cooling system, leading to the tar in the flue gas being precipitated in the bag filter section and being bonded on the bag surface, which cannot be cleaned, finally leading to the damage of the filter bag and the failure of the whole purification system, seriously restricting the normal production and operation of the smelter. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a temperature automatic regulating device for smelter flue gas purification to solve the above-mentioned deficiencies of the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A temperature automatic regulating device for smelter flue gas purification, comprising a primary cooler, a secondary cooler, a tertiary cooler and a quaternary cooler, wherein the primary cooler is provided with an air inlet at the lower end and an air outlet at the top end;

[0007] The air inlet of the primary cooler is connected with the flue gas outlet of the smelter through an air inlet pipeline, and the air outlet of the primary cooler is connected with the air inlets of the secondary cooler, the tertiary cooler and the quaternary cooler through air inlet branch pipes respectively;

[0008] The air outlet of the secondary cooler is connected with the air inlets of the tertiary cooler and the quaternary cooler through air inlet branch pipes respectively;

[0009] The air outlet of the tertiary cooler is connected with the air inlet of the quaternary cooler through an air inlet branch pipe;

[0010] The air outlets of the primary cooler, the secondary cooler, the tertiary cooler and the quaternary cooler are connected with the bag filter through air outlet pipelines and a rough gas fan in sequence;

[0011] The flue gas outlet of the smelter is provided with a temperature detection device;

[0012] Each inlet branch pipe and outlet pipeline is provided with a butterfly valve.

[0013] Further, based on the flue gas temperature detected by the temperature detection device, different staged cooling modes can be adopted by controlling the butterfly valves to connect different coolers in series:

[0014] When the flue gas temperature detected by the temperature detection device is 800-1000 DEG C, the flue gas is sequentially staged cooled by connecting a first cooler, a second cooler, a third cooler and a fourth cooler in series;

[0015] When the flue gas temperature detected by the temperature detection device is 600-799 DEG C, the flue gas is sequentially staged cooled by connecting a first cooler, a second cooler and a third cooler in series or a first cooler, a third cooler and a fourth cooler in series;

[0016] When the flue gas temperature detected by the temperature detection device is 400-599 DEG C, the flue gas is sequentially staged cooled by connecting a first cooler and a second cooler, a first cooler and a third cooler or a first cooler and a fourth cooler in series;

[0017] When the flue gas temperature detected by the temperature detection device is below 400 DEG C, the flue gas is cooled by the first cooler alone.

[0018] Further, the first cooler, the second cooler, the third cooler and the fourth cooler can reduce the flue gas temperature by 200 DEG C, and the flue gas entering the dust bag is not higher than 200 DEG C, and the first cooler, the second cooler, the third cooler and the fourth cooler are all sediment coolers or other coolers capable of achieving the same cooling effect.

[0019] Further, the bottom end of the first cooler, the second cooler, the third cooler and the fourth cooler is provided with a scraper and an ash bin for collecting the dust and tar separated in the cooling process. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a purification system schematic diagram comprising the temperature automatic adjusting device of the utility model;

[0021] Figure 2 is a part connection structure schematic diagram of the coolers in the second embodiment of the utility model. DETAILED DESCRIPTION

[0022] A preferred embodiment of the utility model will be described in detail below in combination with the drawings.

[0023] As Figure 1 The temperature automatic regulating device for smelter flue gas purification, as shown in the utility model, comprises a primary cooler, a secondary cooler, a tertiary cooler and a quaternary cooler, wherein the primary cooler is provided with an air inlet at the lower end and an air outlet at the top end; the air inlet of the primary cooler is connected with the flue gas outlet of the smelter through an air inlet pipeline; the air outlet of the primary cooler is connected with the air inlets of the secondary cooler, the tertiary cooler and the quaternary cooler through air inlet branch pipes respectively; the air outlet of the secondary cooler is connected with the air inlets of the tertiary cooler and the quaternary cooler through air inlet branch pipes respectively; the air outlet of the tertiary cooler is connected with the air inlet of the quaternary cooler through an air inlet branch pipe; the air outlets of the primary cooler, the secondary cooler, the tertiary cooler and the quaternary cooler are connected with a bag-type dust collector through air outlet pipelines and a coarse air blower in sequence; the flue gas outlet of the smelter is provided with a temperature detection device; butterfly valves are arranged on each air inlet branch pipe and air outlet pipeline.

[0024] The primary cooler, the secondary cooler, the tertiary cooler and the quaternary cooler can reduce the temperature of the flue gas by 200℃, and the flue gas entering the dust bag is not higher than 200℃; the primary cooler, the secondary cooler, the tertiary cooler and the quaternary cooler all adopt a settling cooler.

[0025] In order to collect the dust and tar separated in the cooling process in each cooler, the primary cooler, the secondary cooler, the tertiary cooler and the quaternary cooler are all provided with a scraper and an ash bin at the bottom end; in specific use, the cooled flue gas is generally transported to the bag-type dust collector for purification through the coarse air blower, and then is delivered to the downstream user through a clean air blower.

[0026] In specific use, based on the temperature of the flue gas detected by the temperature detection device, the butterfly valves can be controlled to connect different coolers in series to perform different staged cooling modes.

[0027] Embodiment one, as Figure 2When the flue gas temperature detected by the temperature detecting device is 800-1000℃, the flue gas is sequentially cooled by the first-stage cooler, the second-stage cooler, the third-stage cooler and the fourth-stage cooler in series; specifically, the butterfly valves on the gas inlet branch pipes connecting the first-stage cooler and the second-stage cooler, the second-stage cooler and the third-stage cooler, and the third-stage cooler and the fourth-stage cooler are opened, the butterfly valves on the gas inlet branch pipes connecting the first-stage cooler and the third-stage cooler, the first-stage cooler and the fourth-stage cooler, and the third-stage cooler and the fourth-stage cooler are closed, the butterfly valve on the gas outlet pipeline connecting the fourth-stage cooler and the coarse gas fan is opened, and the butterfly valves on the gas outlet pipelines connecting the first-stage cooler and the coarse gas fan, the second-stage cooler and the coarse gas fan, and the third-stage cooler and the coarse gas fan are closed.

[0028] In example two, when the flue gas temperature detected by the temperature detecting device is 600-799℃, the flue gas is sequentially cooled by the first-stage cooler, the second-stage cooler and the third-stage cooler in series or by the first-stage cooler, the third-stage cooler and the fourth-stage cooler in series; the specific operation of the butterfly valves is referred to example one.

[0029] In example three, when the flue gas temperature detected by the temperature detecting device is 400-599℃, the flue gas is sequentially cooled by the first-stage cooler and the second-stage cooler, the first-stage cooler and the third-stage cooler, or the first-stage cooler and the fourth-stage cooler in series; the specific operation of the butterfly valves is referred to example one.

[0030] In example four, when the flue gas temperature detected by the temperature detecting device is below 400℃, the flue gas is cooled by the first-stage cooler alone; at this time, only the butterfly valve on the gas outlet pipeline connecting the first-stage cooler and the coarse gas fan is opened.

[0031] In the specific operation, the butterfly valve can be an electrically (pneumatically) operated regulating butterfly valve, and the valve opening degree can be accurately controlled by sending signals to the actuator of the electrically (pneumatically) operated regulating butterfly valve through the PLC (programmable logic controller) according to the preset control logic of the above-mentioned staged cooling scheme.

[0032] The above-mentioned embodiments are only used to describe the preferred embodiments of the present application, and do not limit the scope of the present application; various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the claims of the present application.

Claims

1. A temperature automatic regulating device for the purification of the fumes of a smelting furnace, characterized in that, The first-stage cooler, the second-stage cooler, the third-stage cooler and the fourth-stage cooler are arranged in sequence, wherein the first-stage cooler is arranged at the bottom end of the pipeline, the second-stage cooler is arranged at the top end of the first-stage cooler, the third-stage cooler is arranged at the top end of the second-stage cooler, and the fourth-stage cooler is arranged at the top end of the third-stage cooler. The gas inlet of the first-stage cooler is connected with the flue gas outlet of the smelting furnace through a gas inlet pipeline, and the gas outlet of the first-stage cooler is connected with the gas inlets of the second-stage cooler, the third-stage cooler and the fourth-stage cooler through gas inlet branch pipes. The gas outlet of the second-stage cooler is connected with the gas inlets of the third-stage cooler and the fourth-stage cooler through gas inlet branch pipes. The gas outlet of the third-stage cooler is connected with the gas inlet of the fourth-stage cooler through a gas inlet branch pipe. The gas outlets of the first-stage cooler, the second-stage cooler, the third-stage cooler and the fourth-stage cooler are connected with the bag-type dust collector through gas outlet pipelines and a coarse gas fan in sequence. A temperature detection device is arranged at the flue gas outlet of the smelting furnace. A butterfly valve is arranged on each gas inlet branch pipe and gas outlet pipeline.

2. The temperature automatic regulating device for flue gas cleaning of a submerged arc furnace according to claim 1, characterized in that, Based on the flue gas temperature detected by the temperature detection device, different cooling stages can be realized by controlling the butterfly valves to connect different coolers in sequence. When the flue gas temperature detected by the temperature detection device is 800-1000℃, the flue gas is cooled in sequence by the first-stage cooler, the second-stage cooler, the third-stage cooler and the fourth-stage cooler connected in sequence. When the flue gas temperature detected by the temperature detection device is 600-799℃, the flue gas is cooled in sequence by the first-stage cooler, the second-stage cooler and the third-stage cooler connected in sequence or the first-stage cooler, the third-stage cooler and the fourth-stage cooler connected in sequence. When the flue gas temperature detected by the temperature detection device is 400-599℃, the flue gas is cooled in sequence by the first-stage cooler and the second-stage cooler, the first-stage cooler and the third-stage cooler or the first-stage cooler and the fourth-stage cooler connected in sequence. When the flue gas temperature detected by the temperature detection device is below 400℃, the flue gas is cooled by the first-stage cooler alone.

3. The temperature automatic regulating device for flue gas cleaning of a submerged arc furnace according to claim 1, characterized in that, The first-stage cooler, the second-stage cooler, the third-stage cooler and the fourth-stage cooler can reduce the flue gas temperature by 200℃, and the flue gas entering the dust bag is not higher than 200℃. The first-stage cooler, the second-stage cooler, the third-stage cooler and the fourth-stage cooler are all sediment coolers.

4. The temperature automatic regulating device for flue gas cleaning of a submerged arc furnace according to claim 1, characterized in that, The bottom end of each of the first-stage cooler, the second-stage cooler, the third-stage cooler and the fourth-stage cooler is provided with a scraper and an ash bin for collecting the dust and tar separated during the cooling process.

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