Novel dust pre-coating system for dust removal of bag-type dust remover

Abstract

The utility model relates to the field of converter copper smelting equipment, in particular to a novel dust pre-coating system for dust removal of a bag-type dust collector, which comprises the bag-type dust collector, a dust pre-coating mechanism is connected to a flue gas inlet of the bag-type dust collector and comprises a lime bin, one end of the lime bin is communicated with a feeding pipe, and a discharging pipe is mounted at the discharging end of the lime bin. According to the bag-type dust collector, the dust pre-coating system is installed, lime can be rapidly and conveniently sprayed to the surface of a bag, dew can be adsorbed, adsorption treatment can be conducted on moisture in annularly-collected flue gas after converter copper smelting, the moisture in the flue gas is reduced, the dust removal efficiency is improved, and the dust removal efficiency is improved. And the purified flue gas enters the bag-type dust collector for dust removal, so that the condition that a cloth bag is hardened is avoided, the surface of the cloth bag is prevented from being corroded by harmful gas and hardened particles, the service life of the cloth bag is prolonged, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of converter copper smelting equipment, in particular to a pre - coating ash system for a new type of bag filter for dust removal. Background Technique

[0002] The bag filter mainly relies on filter bags made of fiber filter materials to filter the dust - containing gas, and purifies the gas through the dust layer formed on the surface of the filter bag. The bag filter is suitable for collecting fine, dry, non - fibrous dust. The filter bag is made of woven filter cloth or non - woven felt, and filters the dust - containing gas by the filtering action of the fiber fabric. When the dust - containing gas enters the bag - type dust collector, dust with large particles and high specific gravity settles down due to the action of gravity and falls into the ash hopper. When the gas containing finer dust passes through the filter material, the dust is retained, and the gas is purified.

[0003] At present, the existing bag filter does not have a pre - coating ash system. Due to the low temperature of the converging flue gas in converter copper smelting, in the south, due to the high humidity in the air and the low temperature in winter, condensation is likely to occur on the surface of the bag. Moreover, the high humidity in the flue gas is likely to cause the bag to agglomerate. When the flue gas contains corrosive gases or particulate matters, the bag is likely to be corroded after being pasted, thus reducing the service life and filtering effect of the bag filter. Therefore, the following invention is proposed. Summary of the Invention

[0004] The main purpose of the utility model is to solve the above - mentioned existing technical problems and provide a pre - coating ash system for a new type of bag filter for dust removal.

[0005] The specific scheme of the utility model is: a pre - coating ash system for a new type of bag filter for dust removal, including a bag filter. A pre - coating ash mechanism is connected to the flue gas inlet of the bag filter. The pre - coating ash mechanism includes a lime silo. One end of the lime silo is communicated with a feed pipe. A discharge pipe is installed at the discharge end of the lime silo. A flap valve is installed on the surface of the discharge pipe. A feeder is arranged below the discharge end of the discharge pipe. A mixing chamber is arranged below the discharge end of the feeder. The top of the mixing chamber is open and the inside is hollow. One end of the mixing chamber has a pipe a. The end of the pipe a far away from the mixing chamber is connected with a fan. The discharge port of the mixing chamber is communicated with a lime conveying pipe. The lime conveying pipe is connected with the flue gas inlet of the bag filter.

[0006] According to the above - mentioned technical scheme, the inner surface of the bag filter is coated with ash through the pre - coating ash mechanism to form a protective film, avoiding the situation that moisture in the flue gas adheres to the surface of the bag to form agglomeration, resulting in poor air permeability of the bag, improving the flue gas filtering effect, and at the same time increasing the service life of the bag filter.

[0007] Further, an exhaust pipe is provided on the lime silo, and the exhaust pipe is communicated with the ash hopper of the bag filter, so that the negative pressure in the ash hopper discharges the excessive pressure in the lime silo.

[0008] According to the above technical solution, the excessive pressure in the lime silo is discharged through the negative pressure of the ash hopper of the bag filter, which increases the space for accommodating lime in the lime silo.

[0009] Further, a blowing mechanism is installed on the surface of the lime silo. The blowing mechanism is used to prevent the lime in the lime silo from caking. The blowing mechanism includes a gas pipe b, which is communicated with the lime silo. One end of the gas pipe b away from the lime silo is connected to a nitrogen storage bin, and a fluidizing valve is installed on the surface of the gas pipe b.

[0010] According to the above technical solution, the nitrogen in the nitrogen storage bin is blown out by controlling the fluidizing valve, and the lime in the lime silo is blown and stirred to prevent the lime from caking after contacting the moisture in the air.

[0011] Further, the feeder is a screw metering feeder.

[0012] According to the above technical solution, the amount of lime entering the interior of the bag filter is controlled by the screw metering feeder to avoid excessive spraying.

[0013] Further, the blower is a Roots blower.

[0014] According to the above technical solution, the existing Roots blower is equipped with a filtration system to prevent the internal impeller from contacting too much dust, so it has a longer service life.

[0015] The present utility model has the following advantages compared with the prior art: The pre-coated ash system is installed in the bag filter for dust removal, which can quickly and conveniently spray lime on the surface of the bag. It can not only adsorb dew but also adsorb and treat the moisture in the annular collecting flue gas after converter copper smelting, reduce the moisture in the flue gas, and enable the purified flue gas to enter the bag filter for dust removal, avoiding the caking of the bag. Thus, it prevents the bag from being corroded by harmful gases and particles caking on the surface, extends the service life of the bag, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the pre-coated ash system of the present utility model;

[0017] In the figure: 1, lime silo; 2, blower; 3, bag filter; 4, feed pipe; 5, discharge pipe; 6, gate valve; 7, feeder; 8, mixing chamber; 9, gas pipe a; 10, lime conveying pipe; 11, exhaust pipe; 12, gas pipe b; 13, nitrogen storage bin; 14, fluidizing valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] See Figure 1 Figure 1 , this embodiment is a pre - coating ash system for a new type of bag filter for dust removal, which is composed of a lime silo 1, a fan 2 and other structures. A pre - coating ash mechanism is connected to the flue gas inlet of the bag filter 3. The pre - coating ash mechanism includes a lime silo 1. One end of the lime silo 1 is connected to a feed pipe 4, and the feed pipe 4 is used to fill lime into the lime silo 1. The discharge end of the lime silo 1 is equipped with a discharge pipe 5, and a knife gate valve 6 is installed on the surface of the discharge pipe 5. The knife gate valve 6 controls the amount of lime discharged by controlling the opening size. A feeder 7 is arranged below the discharge end of the discharge pipe 5, and a mixing chamber 8 is arranged below the discharge end of the feeder 7. The top opening of the mixing chamber 8 is used to receive lime and is hollow inside. One end of the mixing chamber 8 is connected to an air pipe a9, and the end of the air pipe a9 far from the mixing chamber 8 is connected to a fan 2. The fan 2 is used to provide high - pressure air to transport the internal air through a lime conveying pipe 10 into the bag filter 3. The discharge port of the mixing chamber 8 is connected to a lime conveying pipe 10, and the lime conveying pipe 10 is connected to the flue gas inlet of the bag filter 3.

[0019] Further, an exhaust pipe 11 is provided on the lime silo 1, and the exhaust pipe 11 is connected to the ash hopper of the bag filter 3, so that the negative pressure in the ash hopper discharges the excess pressure in the lime silo 1, increasing the space for storing lime in the lime silo 1 and making the internal lime storage capacity larger.

[0020] Further, a blowing mechanism is installed on the surface of the lime silo 1. The blowing mechanism is used to prevent the lime in the lime silo 1 from caking. The blowing mechanism includes an air pipe b12, the air pipe b12 is connected to the lime silo 1, and the end of the air pipe b12 far from the lime silo 1 is connected to a nitrogen storage tank 13. The nitrogen storage tank 13 is used to store nitrogen. A fluidizing valve 14 is installed on the surface of the air pipe b12. The fluidizing valve 14 is used to control the discharge of nitrogen in the nitrogen storage tank 13, so as to blow and stir the lime inside the lime silo 1 and prevent caking.

[0021] Further, the feeder 7 is a spiral metering feeder, and the volume of lime falling into the mixing chamber 8 can be controlled by the spiral metering feeder to avoid excessive lime transportation.

[0022] Further, the fan 2 is a Roots blower. The existing Roots blower comes with a filtration system and has a longer service life and is more practical when used in this environment.

[0023] The working principle of this embodiment is as follows: When pre-coating the bag filter 3, first pour lime into the lime silo 1 through the feed pipe 4, and open the fluidization valve 14 to blow nitrogen into the lime in the lime silo 1 through the gas pipe b12, so as to stir the lime to prevent caking. Then, control the slide valve 6 and the feeder 7 to pour the lime into the mixing chamber 8. Finally, the high-pressure air provided by the fan 2 is used to spray the lime inside the mixing chamber 8 into the bag filter 3 through the lime conveying pipe 10 for coating work, avoiding the direct entry of low-temperature flue gas into the bag filter 3, and preventing the water quality of the flue gas from solidifying and caking with the dust in the flue gas on the surface of the bag, which may cause abnormal operation of the bag. At the same time, it also avoids the corrosion of the bag by the caking corrosive gas and particle paste on the bag, greatly improving the service life and working stability. Since the water quality contacts with lime for adsorption treatment after surface coating, it prevents the water quality and particles in the flue gas from directly caking on the bag, thus playing a protective role. At the same time, the lime has good air permeability and does not affect the discharge of purified air, improving the service life and use stability of the bag filter 3.

Claims

1. A pre - coating ash system for dust removal of a new type of bag filter, comprising a bag filter, characterized in that, A pre - coating mechanism is connected to the flue gas inlet of the bag filter. The pre - coating mechanism includes a lime silo. One end of the lime silo is connected to a feed pipe, and a discharge pipe is installed at the discharge end of the lime silo. A plug valve is installed on the surface of the discharge pipe. A feeder is arranged below the discharge end of the discharge pipe. A gas mixing chamber is arranged below the discharge end of the feeder. The top of the gas mixing chamber is open and the inside is hollow. There is a pipe a at one end of the gas mixing chamber. The end of the pipe a away from the gas mixing chamber is connected to a fan. The discharge port of the gas mixing chamber is connected to a lime conveying pipe. The end of the lime conveying pipe away from the gas mixing chamber is connected to the flue gas inlet of the bag filter.

2. The pre - coating ash system for dust removal of a new type of bag filter according to claim 1, characterized in that, An exhaust pipe is provided on the lime silo, and the exhaust pipe is connected to the ash hopper of the bag filter, so that the negative pressure in the ash hopper discharges the excess pressure in the lime silo.

3. A pre - coating ash system for dust removal of a new type of bag filter according to claim 1 or 2, characterized in that, A blowing mechanism is installed on the surface of the lime silo. The blowing mechanism is used to prevent the lime in the lime silo from caking. The blowing mechanism includes a pipe b. The pipe b is connected to the lime silo. The end of the pipe b away from the lime silo is connected to a nitrogen storage tank. A fluidizing valve is installed on the surface of the pipe b.

4. A pre - coating ash system for dust removal of a new type of bag filter according to claim 1 or 2, characterized in that, The feeder is a screw - type metering feeder.

5. A pre - coating ash system for a new type of bag filter for dust removal according to claim 1 or 2, characterized in that, The fan is a Roots blower.

Images