CN214552196U - Tail gas treatment system after waste heat utilization of ferrosilicon ore heat furnace - Google Patents

Abstract

The utility model discloses a hot stove waste heat utilization rear tail gas processing system of ferrosilicon ore, including the hot stove of ferrosilicon ore, flue gas collection device, exhaust-heat boiler, condenser, gravity dust collector, sack cleaner, wet dust collector, electrostatic precipitator, chimney and dust collection device, at first through exhaust-heat boiler cooling dust removal back, cooling dust removal through the condenser, reaching the emission that reduces dust and harmful gas through multistage dust removals such as gravity dust collector, sack cleaner, wet dust collector, electrostatic precipitator.

Description

Tail gas treatment system after waste heat utilization of ferrosilicon ore heat furnace

Technical Field

The utility model relates to a hot stove equipment technical field in metallurgical ore deposit, in particular to hot stove waste heat utilization back tail gas processing system in ferrosilicon ore deposit.

Background

The ferrosilicon ore smelting furnace can generate a large amount of dust-containing flue gas in the actual production process, the temperature of the high-temperature flue gas can reach 400 ℃, and most of the flue gas is high-temperature coal gas generated in the smelting stage of the ore smelting furnace; and the smoke with high tar content generated in the furnace baking stage of the submerged arc furnace and the smoke emitted outside the submerged arc furnace along with the discharging process of the smelting product in the discharging stage of the smelting product are also at least partially contained. Because this part flue gas temperature is higher and contain more smoke and dust so can not directly discharge, often need lower the temperature earlier and remove dust, discharge after carrying out recycle with the waste heat, above-mentioned flue gas still contains more dust particulate matter and accompanies the waste gas of high temperature, if direct discharge can lead to too much harmful dust to get into the atmosphere, cause the environment serious pollution.

SUMMERY OF THE UTILITY MODEL

In view of this, it is necessary to provide a tail gas treatment system after waste heat utilization of a ferrosilicon ore heating furnace, which reduces temperature and dust, removes dust in multiple stages, and reduces dust emission.

A tail gas treatment system after waste heat utilization of a ferrosilicon ore heating furnace comprises the ferrosilicon ore heating furnace, a smoke collecting device, a waste heat boiler, a condenser, a gravity dust collector, a bag-type dust collector, a wet dust collector, an electrostatic dust collector, a chimney and a dust collecting device, wherein a smoke inlet of the smoke collecting device is butted with a smoke outlet of the ferrosilicon ore heating furnace, the smoke collecting device, the waste heat boiler, the condenser, the gravity dust collector, the bag-type dust collector, the wet dust collector, the electrostatic dust collector and the chimney are sequentially connected by a pipeline, smoke of the ferrosilicon ore heating furnace enters from the smoke inlet of the smoke collecting device and is sequentially discharged after passing through the waste heat boiler, the condenser, the gravity dust collector, the bag-type dust collector, the wet dust collector, the electrostatic dust collector and the chimney, the waste heat boiler is provided with a first dust outlet, the condenser is provided with a second dust outlet, and the gravity dust collector is provided with a third dust outlet, the bag-type dust collector is provided with a fourth dust discharge port, the wet dust collector is provided with a fifth dust discharge port, the electrostatic dust collector is provided with a sixth dust discharge port, the first dust discharge port, the second dust discharge port, the third dust discharge port, the fourth dust discharge port, the fifth dust discharge port and the sixth dust discharge port are all arranged on the same straight line, and the dust collecting device is arranged below the first dust discharge port, the second dust discharge port, the third dust discharge port, the fourth dust discharge port, the fifth dust discharge port and the sixth dust discharge port.

Preferably, the flue gas collecting device is provided with a first flue gas outlet and a second flue gas outlet, the first flue gas outlet is communicated with the air inlet of the waste heat boiler, the second flue gas outlet is communicated with the air inlet of the condenser, a first flue gas baffle is arranged at the first flue gas outlet, a second flue gas baffle is arranged at the second flue gas outlet, and when the first flue gas baffle is in an open state, the second flue gas baffle is in a closed state; when the first smoke baffle is in a closed state, the second smoke baffle is in an open state.

Preferably, the air inlet of the condenser is provided with a temperature detector, and the temperature detector detects the temperature of the passing flue gas and then adjusts the cooling power of the condenser to control the temperature of the flue gas discharged from the condenser within a certain range.

Preferably, the dust collecting device comprises an auger conveying assembly and a collecting box, the auger conveying assembly is arranged below the first dust outlet, the second dust outlet, the third dust outlet, the fourth dust outlet, the fifth dust outlet and the sixth dust outlet, and the collecting box is arranged below one end of the auger conveying assembly.

Preferably, the ferrosilicon hot furnace waste heat utilization rear tail gas treatment system further comprises a waste gas reaction device, and an air inlet pipe of the waste gas reaction device is connected with an exhaust pipe of the electrostatic dust collector.

In the tail gas treatment system after the waste heat of the ferrosilicon ore heating furnace is utilized, the flue gas collecting device conveys high-temperature flue gas exhausted by the ferrosilicon ore heating furnace to the waste heat boiler, the temperature of the flue gas is reduced in the process of exchanging heat in the high-temperature flue gas, and part of dust is removed; inputting the powder into a condenser for further cooling, and removing a part of dust; entering a gravity dust collector to remove a part of dust; entering a bag-type dust collector, and removing most of the residual dust; the waste gas discharged from the bag-type dust collector enters a wet dust collector to remove all particle dust and harmful impurities such as hydrogen sulfide, sulfur dioxide and the like contained in the waste gas; the waste gas discharged from the wet dust collector enters the high-efficiency electrostatic dust collector to remove all fine dust particles contained in the waste gas, and the waste gas is subjected to multistage cooling, dust removal and harmful impurity removal and then is discharged through a chimney, so that the problem of atmospheric pollution caused by direct discharge to the atmosphere is solved.

Drawings

Fig. 1 is a block diagram of the present invention.

Fig. 2 is a block diagram of another embodiment.

In the figure: the system comprises a ferrosilicon hot furnace waste heat utilization tail gas treatment system 100, a ferrosilicon hot furnace 10, a flue gas collection device 20, a first flue gas outlet 21, a second flue gas outlet 22, a waste heat boiler 30, a first dust outlet 31, a condenser 40, a second dust outlet 41, a gravity dust collector 50, a third dust outlet 51, a bag-type dust collector 60, a fourth dust outlet 61, a wet dust collector 70, a fifth dust outlet 71, an electrostatic dust collector 80, a sixth dust outlet 81, a dust collection device 90, an auger conveying assembly 91, a collection box 92, a chimney 101 and a waste gas reaction device 102.

Detailed Description

The following combines the utility model discloses an attached drawing does further elaboration to the technical scheme and the technological effect of utility model embodiment.

Referring to fig. 1, a ferrosilicon hot furnace waste heat utilization rear tail gas treatment system 100 includes a ferrosilicon hot furnace 10, a flue gas collection device 20, a waste heat boiler 30, a condenser 40, a gravity dust collector 50, a bag-type dust collector 60, a wet dust collector 70, an electrostatic dust collector 80, a dust collection device 90 and a chimney 101, a flue gas inlet of the flue gas collection device 20 is installed on a flue gas outlet of the ferrosilicon hot furnace 10, the flue gas collection device 20, the waste heat boiler 30, the condenser 40, the gravity dust collector 50, the bag-type dust collector 60, the wet dust collector 70, the electrostatic dust collector 80 and the chimney 101 are sequentially connected by a pipeline, the flue gas collection device 20 conveys high-temperature flue gas discharged by the ferrosilicon hot furnace 10 to the waste heat boiler 30, reduces the temperature of the flue gas after heat exchange, removes a part of dust in the flue gas, the flue gas further reduces the temperature after flowing into the condenser 40 from the waste heat boiler 30, the temperature of the flue gas is reduced, so that the service life of each subsequent stage of dust remover is prolonged, and the flue gas enters the gravity dust remover 50 from the condenser 40 to remove a part of dust; the flue gas enters the bag-type dust collector 60 from the gravity dust collector 50, most of the residual dust is removed, the waste gas discharged from the bag-type dust collector 60 enters the wet dust collector 70 to remove all particle dust and harmful impurities such as hydrogen sulfide and sulfur dioxide contained in the waste gas, the waste gas discharged from the wet dust collector 70 enters the high-efficiency electrostatic dust collector 80 to remove all fine dust particles contained in the waste gas, and finally the waste gas meets the standard of being discharged to the atmosphere and is discharged through the chimney 101.

Referring to fig. 1, the exhaust-heat boiler 30 is provided with a first dust outlet 31, the condenser 40 is provided with a second dust outlet 41, the gravity dust collector 50 is provided with a third dust outlet 51, the bag-type dust collector 60 is provided with a fourth dust outlet 61, the wet dust collector 70 is provided with a fifth dust outlet 71, the electrostatic dust collector 80 is provided with a sixth dust outlet 81, the first dust outlet 31, the second dust outlet 41, the third dust outlet 51, the fourth dust outlet 61, the fifth dust outlet 71 and the sixth dust outlet 81 are all arranged on the same straight line, and the dust collecting device 90 is arranged below the first dust outlet 31, the second dust outlet 41, the third dust outlet 51, the fourth dust outlet 61, the fifth dust outlet 71 and the sixth dust outlet 81. The dust collecting device 90 comprises an auger conveying assembly 91 and a collecting box 92, wherein the auger conveying assembly 91 is arranged below the first dust outlet 31, the second dust outlet 41, the third dust outlet 51, the fourth dust outlet 61, the fifth dust outlet 71 and the sixth dust outlet 81, the collecting box 92 is arranged below one end of the auger conveying assembly 91, the dust collected by the multistage dust removing hand is collected into the auger conveying assembly 91, and the collected dust is collected and conveyed to the collecting box 92 through the auger conveying assembly 91. The air inlet of the condenser 40 is provided with a temperature detector 42, and the temperature detector 42 detects the temperature of the passing flue gas and adjusts the power of the condenser 40 to control the temperature of the flue gas discharged from the condenser 40 within a certain range.

In another embodiment, referring to fig. 2, the flue gas collecting device 20 is provided with a first flue gas outlet 21 and a second flue gas outlet 22, the first flue gas outlet 21 is communicated with an air inlet of the waste heat boiler 30, the second flue gas outlet 22 is communicated with an air inlet of the condenser 40, a first flue gas baffle is arranged at the first flue gas outlet 21, a second flue gas baffle is arranged at the second flue gas outlet 22, and when the first flue gas baffle is in an open state, the second flue gas baffle is in a closed state; when the first flue gas baffle is in the closed state, the second flue gas baffle is in the open state, and when exhaust-heat boiler 30 is in the maintenance state, close first flue gas discharge port 21, open second flue gas discharge port 22, the flue gas that produces can form continuous production through cooling and multistage dust removal in the hot stove 10 of ferrosilicon ore, can not receive factors such as exhaust-heat boiler 30's maintenance and influence continuous production. The tail gas treatment system 100 after the waste heat of the ferrosilicon hot furnace is utilized also comprises a waste gas reaction device 102, the waste gas reaction device 102 is connected to an exhaust pipe of the electrostatic dust collector 80, and the exhaust pipe of the electrostatic dust collector 80 is introduced into the waste gas reaction device 101 to produce various chemical products, such as dimethyl carbonate, dimethyl ether, methanol, urea fertilizer and the like.

Claims (5)

1. A tail gas treatment system after waste heat utilization of a ferrosilicon ore heating furnace is characterized by comprising the ferrosilicon ore heating furnace, a smoke collecting device, a waste heat boiler, a condenser, a gravity dust collector, a bag-type dust collector, a wet dust collector, an electrostatic dust collector, a chimney and a dust collecting device, wherein a smoke inlet of the smoke collecting device is butted with a smoke outlet of the ferrosilicon ore heating furnace, the smoke collecting device, the waste heat boiler, the condenser, the gravity dust collector, the bag-type dust collector, the wet dust collector, the electrostatic dust collector and the chimney are sequentially connected by a pipeline, smoke of the ferrosilicon ore heating furnace enters from the smoke inlet of the smoke collecting device and is discharged after sequentially passing through the waste heat boiler, the condenser, the gravity dust collector, the bag-type dust collector, the wet dust collector, the electrostatic dust collector and the chimney, the waste heat boiler is provided with a first dust outlet, the condenser is provided with a second dust outlet, the gravity dust collector is provided with a third dust discharge port, the bag-type dust collector is provided with a fourth dust discharge port, the wet dust collector is provided with a fifth dust discharge port, the electrostatic dust collector is provided with a sixth dust discharge port, the first dust discharge port, the second dust discharge port, the third dust discharge port, the fourth dust discharge port, the fifth dust discharge port and the sixth dust discharge port are all arranged on the same straight line, and the dust collecting device is arranged below the first dust discharge port, the second dust discharge port, the third dust discharge port, the fourth dust discharge port, the fifth dust discharge port and the sixth dust discharge port.

2. The system of claim 1, wherein the flue gas collecting device is provided with a first flue gas outlet and a second flue gas outlet, the first flue gas outlet is communicated with the inlet of the waste heat boiler, the second flue gas outlet is communicated with the inlet of the condenser, the first flue gas outlet is provided with a first flue gas baffle, the second flue gas outlet is provided with a second flue gas baffle, and the second flue gas baffle is in a closed state when the first flue gas baffle is in an open state; when the first smoke baffle is in a closed state, the second smoke baffle is in an open state.

3. The system of claim 2, wherein the inlet of the condenser is provided with a temperature sensor for detecting the temperature of the flue gas passing through the condenser and adjusting the cooling power of the condenser to control the temperature of the flue gas discharged from the condenser within a certain range.

4. The system of claim 3, wherein the dust collecting device comprises an auger delivery assembly and a collection box, the auger delivery assembly is disposed under the first, second, third, fourth, fifth and sixth dust outlets, and the collection box is disposed under one end of the auger delivery assembly.

5. The system of claim 4, further comprising a waste gas reaction device, wherein an inlet pipe of the waste gas reaction device is connected to an exhaust pipe of the electrostatic precipitator.

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