CN213447183U - Waste gas discharge device of hot blast stove - Google Patents
Waste gas discharge device of hot blast stove Download PDFInfo
- Publication number
- CN213447183U CN213447183U CN202021521861.1U CN202021521861U CN213447183U CN 213447183 U CN213447183 U CN 213447183U CN 202021521861 U CN202021521861 U CN 202021521861U CN 213447183 U CN213447183 U CN 213447183U
- Authority
- CN
- China
- Prior art keywords
- waste gas
- oxygen
- gas discharge
- hot blast
- blast stove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a waste gas discharge device of a hot blast stove, which comprises an oxygen-containing waste gas discharge pipeline led out from the hot blast stove, an oxygen-containing waste gas discharge valve arranged on the oxygen-containing waste gas discharge pipeline, an oxygen content sensor arranged at the outlet side of the oxygen-containing waste gas discharge valve, a PLC (programmable logic controller), a waste gas header pipe and a chimney connected at the tail end of the waste gas header pipe; the oxygen-containing waste gas discharge pipeline is connected with the waste gas main pipe, and the signal end of the oxygen content sensor is connected with the PLC; and the PLC controls the oxygen-containing waste gas discharge valve to be closed according to the received oxygen content data. The device can directly discharge the oxygen-containing waste gas to the air-heating furnace chimney for emptying through a special pipeline, thereby not only not influencing the recycling of the flue gas, but also solving the problem that the oxygen content of the dry gas of the powder making system exceeds the standard due to the utilization of the flue gas waste heat of the air-heating furnace, and ensuring the safe production.
Description
Technical Field
The utility model relates to a hot-blast furnace, concretely relates to exhaust emission device of hot-blast furnace.
Background
The hot blast stove is a device for heating and blowing the blast furnace and is an indispensable important component of the modern blast furnace. The most common heat accumulating type checker brick hot blast stove for modern large blast furnaces has the working principle that coal gas is firstly combusted, the checker bricks of a heat accumulating chamber are heated by the generated smoke, cold air is then heated by the hot checker bricks, and then the hot blast stove is alternately combusted and supplied with air in turn, so that the blast furnace continuously obtains high-temperature hot air. A large amount of flue gas generated in the combustion process of the hot blast stove enters a large flue through a flue valve to be intensively discharged. These flue gases have temperatures of 250 ℃ and 350 ℃ and contain very little oxygen (less than 1%). At present, flue gas of a hot blast stove is basically preheated and recycled by a preheater (the temperature is reduced to about 170 ℃), and then is introduced into a coal injection and pulverization system to be used as dry gas, so that the heat energy of the flue gas is recycled to the maximum extent.
When the air supply of the hot blast stove is finished and the hot blast stove is combusted, high-pressure air (containing 21% of oxygen) is filled in the hot blast stove, and the air (called as waste gas) needs to be discharged, so that a gas valve and a combustion-supporting air valve of the hot blast stove can be opened, and the combustion operation can be carried out. At present, waste gas is directly put into a large flue through a waste gas valve and is discharged together with flue gas. Therefore, a problem is caused, and when waste gas is discharged, the oxygen content of the powder preparation system can exceed the standard in a short time, so that the safety requirement of bituminous coal injection is not met.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: in order to overcome the defects of the prior art, the utility model provides a waste gas discharging device of a hot blast stove, which can avoid oxygen-containing waste gas to enter a powder making system.
The technical scheme is as follows: the utility model relates to a waste gas discharge device of a hot blast stove, which comprises an oxygen-containing waste gas discharge pipeline led out from the hot blast stove, an oxygen-containing waste gas discharge valve arranged on the oxygen-containing waste gas discharge pipeline, an oxygen content sensor arranged at the outlet side of the oxygen-containing waste gas discharge valve, a PLC (programmable logic controller), a waste gas header pipe and a chimney connected at the tail end of the waste gas header pipe; the oxygen-containing waste gas discharge pipeline is connected with the waste gas main pipe, and the signal end of the oxygen content sensor is connected with the PLC; and the PLC controls the oxygen-containing waste gas discharge valve to be closed according to the received oxygen content data.
Specifically, a flow sensor is arranged on the exhaust gas main pipe.
And the signal end of the flow sensor is connected with the PLC, and the PLC controls the opening of the oxygen-containing waste gas discharge valve according to the received flow data.
Has the advantages that: when the air supply of the hot blast stove is finished and the combustion is finished, the device can directly discharge oxygen-containing waste gas to the air-blast stove chimney for emptying through a special pipeline, the recycling of smoke is not influenced, the problem that the dry gas of the powder making system contains oxygen and exceeds the standard due to the waste heat of the smoke of the hot blast stove can be solved, and the safe production is guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
As shown in fig. 1, the present invention will be described in further detail by taking an air supply system composed of three hot blast stoves of a certain blast furnace as an example. In order to emphasize the improvement points of the present invention, besides the hot blast stove 1, the exhaust gas main pipe 6 and the chimney 7, the pipes and devices of the original hot blast stove system are not shown in the drawings, but it is clear that these original devices still exist in the hot blast stove system to which the exhaust gas discharging device is applied.
Specifically, the exhaust gas discharge device of the hot blast stove comprises an oxygen-containing exhaust gas discharge pipeline 2, an oxygen-containing exhaust gas discharge valve 3, an oxygen content sensor 4, a PLC (programmable logic controller) 5, an exhaust gas manifold 6, a chimney 7, a flow sensor 8 and a check valve 9.
The oxygen-containing waste gas discharge pipeline 2 is positioned between the hot blast stove 1 and the waste gas main pipe 6, one end of the oxygen-containing waste gas discharge pipeline is connected with the middle upper part of the stove body of the hot blast stove 1, and the other end of the oxygen-containing waste gas discharge pipeline is connected with the waste gas main pipe 6. In order to reduce the noise pollution of the discharged oxygen-containing off-gas and to facilitate the opening of the oxygen-containing off-gas discharge valve 3, the pipe diameter of the oxygen-containing off-gas discharge pipe 2 should be set generally below 1/3 of the pipe diameter of the off-gas main 6.
The oxygen content sensor 4 is disposed at the outlet side of the oxygen-containing exhaust gas discharge valve 3 for detecting the oxygen content, and its signal end is connected to the PLC controller 5. The flow sensor 8 is arranged on the exhaust gas manifold 6 and used for detecting the flow of the exhaust gas, and the signal end of the flow sensor is also connected with the PLC 5.
After the oxygen-containing waste gas discharge valve 3 is opened to discharge the oxygen-containing waste gas, the PLC 5 controls the opening of the oxygen-containing waste gas discharge valve 3 according to the received flow data, and the stability of the discharge of the oxygen-containing waste gas is guaranteed. And when the oxygen content reaches a safe value, controlling the oxygen-containing waste gas discharge valve 3 to close, finishing the discharge of the oxygen-containing waste gas, and carrying out normal furnace burning operation.
Further, in order to avoid the backflow of the oxygen-containing exhaust gas, a check valve 9 is further arranged on the exhaust gas manifold 6 to ensure safety.
Claims (6)
1. A waste gas discharge device of a hot blast stove is characterized by comprising an oxygen-containing waste gas discharge pipeline (2) led out from a hot blast stove (1), an oxygen-containing waste gas discharge valve (3) arranged on the oxygen-containing waste gas discharge pipeline (2), an oxygen content sensor (4) arranged on the outlet side of the oxygen-containing waste gas discharge valve (3), a PLC (programmable logic controller) controller (5), a waste gas main pipe (6) and a chimney (7) connected to the tail end of the waste gas main pipe (6); the oxygen-containing waste gas discharge pipeline (2) is connected with the waste gas main pipe (6), and the signal end of the oxygen content sensor (4) is connected with the PLC (5); and the PLC (5) controls the oxygen-containing waste gas discharge valve (3) to be closed according to the received oxygen content data.
2. The exhaust gas discharge device of a hot blast stove according to claim 1, characterized in that a flow sensor (8) is provided on the exhaust gas manifold (6).
3. The exhaust emission device of a hot blast stove according to claim 2, characterized in that the signal end of the flow sensor (8) is connected to the PLC controller (5), and the PLC controller (5) controls the opening degree of the oxygen-containing exhaust emission valve (3) according to the received flow data.
4. The exhaust gas discharge device of a hot blast stove according to claim 1, characterized in that the exhaust gas manifold (6) is provided with a non-return valve (9).
5. The exhaust gas discharge device of a hot blast stove according to claim 1, characterized in that the oxygen-containing exhaust gas discharge duct (2) is connected to the upper middle portion of the shaft of the hot blast stove (1) and is located on the same side as the exhaust gas main (6).
6. The exhaust gas discharging device of the hot blast stove according to claim 1, wherein the pipe diameter of the oxygen-containing exhaust gas discharging pipe (2) is 1/3 or less of the pipe diameter of the exhaust gas main pipe (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021521861.1U CN213447183U (en) | 2020-07-28 | 2020-07-28 | Waste gas discharge device of hot blast stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021521861.1U CN213447183U (en) | 2020-07-28 | 2020-07-28 | Waste gas discharge device of hot blast stove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213447183U true CN213447183U (en) | 2021-06-15 |
Family
ID=76307245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021521861.1U Active CN213447183U (en) | 2020-07-28 | 2020-07-28 | Waste gas discharge device of hot blast stove |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213447183U (en) |
-
2020
- 2020-07-28 CN CN202021521861.1U patent/CN213447183U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204648216U (en) | A kind of Problem of Biomass Fuel Gas Combustion installment with UTILIZATION OF VESIDUAL HEAT IN | |
| CN207963507U (en) | A kind of coal base shaft furnace flue gas waste heat recovery system | |
| CN103088178B (en) | Blast furnace hot-blast stove flue gas self-circulation combustion method and system | |
| CN211771479U (en) | Chain grate-rotary kiln-circular cooler with reheating SCR (Selective catalytic reduction) ultralow emission | |
| CN102994677A (en) | System and method for power generation utilizing waste heat of tail waste gas of blast-furnace hot blast stove | |
| CN101726175A (en) | Heat accumulating type external heat blast cupola furnace | |
| CN201706903U (en) | Device used for controlling internal pressure of furnace and recovering heat energy of flue gas | |
| CN103063044B (en) | Rotary hearth furnace smoke waste heat utilization system and rotary hearth furnace fume afterheat Application way | |
| CN101487065B (en) | High blast temperature system of blast furnace hot blast stove | |
| CN213447183U (en) | Waste gas discharge device of hot blast stove | |
| CN102563858B (en) | Complementary combustion device for low temperature waste heat power generation | |
| CN102942312B (en) | Energy-saving environment-friendly lime shaft kiln | |
| CN202730150U (en) | Power generation system utilizing waste heat of waste gas at tail of blast furnace hot blast stove | |
| CN208038322U (en) | A kind of lime shaft kiln cooling air cyclic utilization system | |
| CN216592759U (en) | Hierarchical application system of pottery kiln waste heat | |
| CN214693917U (en) | External combustion annular sleeve kiln system | |
| CN1301335C (en) | High-air temp hot-blast stove for blast furnace | |
| CN205838912U (en) | A kind of coke oven combustion chamber segmentation supply heater | |
| CN209027304U (en) | A kind of recyclable device to discharge for Industrial Stoves from heat load | |
| CN100344568C (en) | Cement clinker sintering technology and its equipment | |
| CN201355185Y (en) | Energy-saving kiln | |
| CN208472137U (en) | A kind of low-grade Iron concentrate directly melts iron-smelting device | |
| CN116083673B (en) | Synchronous desulfurization and denitrification system for cascade utilization of flue gas of blast furnace hot blast stove | |
| CN215983864U (en) | Energy-saving coke tank wet coke drying system | |
| CN219551221U (en) | Calcium carbide furnace tail gas heat utilization device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |