CN214088570U - Dew point control device for humidifying furnace chamber of annealing furnace - Google Patents
Dew point control device for humidifying furnace chamber of annealing furnace Download PDFInfo
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- CN214088570U CN214088570U CN202022207657.9U CN202022207657U CN214088570U CN 214088570 U CN214088570 U CN 214088570U CN 202022207657 U CN202022207657 U CN 202022207657U CN 214088570 U CN214088570 U CN 214088570U
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Abstract
The utility model relates to the field of heat treatment equipment, in particular to a dew point control device for humidifying an annealing furnace chamber. The utility model provides a dew point controlling means for annealing stove furnace chamber humidification, includes annealing stove (1), is equipped with dew point transducer (11) in the furnace chamber of annealing stove (1), is equipped with the import of humidification gas on annealing stove (1), characterized by: the water tank is characterized by further comprising a water tank (2) and a controller (6), a heater (21) and an atomizer (22) are arranged in the water tank (2), a liquid level meter (23) is arranged on one side of the water tank (2), a water temperature sensor (24) and a gas pressure sensor (25) are arranged on the other side of the water tank (2), and a water inlet, a water outlet, a pressure relief opening, a gas inlet and a gas transmission opening which penetrate through the inner cavity are formed in the water tank (2) respectively; the water inlet end of the main water inlet pipe (31) is connected with a pure water source; the air inlet end of the main air pipe (37) is connected with a nitrogen source. The utility model discloses control accuracy is high, improves belted steel quality.
Description
Technical Field
The utility model relates to the field of heat treatment equipment, in particular to a dew point control device for humidifying an annealing furnace chamber.
Background
The cold-rolled sheet has excellent mechanical properties and surface quality, and can produce steel plates with high strength and high surface quality in a large scale, so the cold-rolled sheet is widely applied. Most of modern cold rolling adopts a continuous annealing process, and high-strength steel is produced by adding alloy elements such as silicon, manganese and the like and assisting annealing processes such as rapid cooling and the like. Under the production process, alloy elements such as silicon, manganese and the like can be precipitated to the surface of the steel plate in an annealing furnace due to the characteristic of oxygen affinity, and then are crystallized and nucleated on the surface of the steel plate, so that a plurality of defects are brought to subsequent production, such as roll mark scratch or plating leakage and the like, and the product performance is influenced.
Aiming at the problem of the precipitation of alloy elements during the quenching and annealing of high-strength steel, the currently adopted measures are to pre-oxidize the surface of strip steel in a heating section of an annealing furnace so as to prevent the precipitation of the alloy elements, and two methods are mainly adopted: firstly, compressed air is input into the annealing furnace, and the surface of the strip steel is oxidized by utilizing oxygen in the air, so that the scheme is difficult to control the input oxygen and has poor effect. In another method, a humidifying device is adopted to inject a small amount of wet nitrogen into the furnace, and the moisture in the wet nitrogen is decomposed into hydrogen and oxygen in the annealing furnace under the high temperature, so that the purpose of micro-oxidation of the strip steel is achieved. Because the inner cavity of the hearth of the annealing furnace is large in volume, the humidification quantity of a common humidifying device can not meet the requirement of dew point control in the furnace far away. The control difficulty is great.
Therefore, the pre-oxidation control effect in the annealing furnace is not ideal at present, and the defects of the strip steel frequently occur.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a heat treatment device with high control precision and improved strip steel quality, which discloses a dew point control device for humidifying the furnace chamber of an annealing furnace.
The utility model discloses a following technical scheme reaches the invention purpose:
the utility model provides a dew point controlling means for annealing stove furnace chamber humidification, includes the annealing stove, is equipped with dew point sensor in the furnace chamber of annealing stove, is equipped with the inlet of humidification gas on the annealing stove, characterized by: also comprises a water tank and a controller,
pure water not exceeding 1/2 is filled in the water tank, a heater and an atomizer are arranged in the water tank, the heater is not arranged below the water surface of the pure water, the atomizer is arranged above the water surface of the pure water, a liquid level meter is arranged on one side of the water tank, a water temperature sensor and a gas pressure sensor are arranged on the other side of the water tank, a water inlet, a water outlet, a pressure relief opening, a gas inlet and a gas transmission opening which penetrate through an inner cavity are respectively arranged on the water tank, the water inlet, the pressure relief opening and the gas transmission opening are all higher than the water surface of the pure water, the water outlet and the water outlet are arranged at the bottom of the water tank, and the gas inlet is lower than the water surface of the pure water;
the water inlet end of the main water inlet pipe is connected with a pure water source, the main water inlet pipe is connected with a water inlet valve in series, the water outlet end of the main water inlet pipe is connected with a water inlet of a water tank, the water inlet end of the atomized water pipe is connected with a water outlet of the water tank, the atomized water pipe is sequentially connected with a circulating water pump and an atomized flow meter in series, the water outlet end of the atomized water pipe is connected with a water inlet of an atomizer, the water inlet end of the water discharge pipe is connected with a water discharge port of the water tank, the water discharge pipe is connected with a water discharge valve in series, the air inlet end of the pressure discharge pipe is connected with a pressure relief port of the water tank, the pressure relief pipe is connected with a pressure relief valve in series, and the water discharge end of the water discharge pipe and the air relief end of the pressure relief pipe are both connected with the main water discharge pipe;
the air inlet end of the humidifying pipe is connected with the air conveying port of the water tank, the three-way joint is provided with two inlets and one outlet, the three-way joint is connected with the humidifying pipe in series by one inlet and one outlet, and the air outlet end of the humidifying pipe is connected with the humidifying air inlet of the annealing furnace;
the air inlet end of the main air conveying pipe is connected with a nitrogen source, a main air inlet valve and a pressure reducing valve are sequentially connected on the main air conveying pipe in series, the air outlet end of the main air conveying pipe is respectively connected with the air inlet ends of a wet path air conveying pipe and a main path air conveying pipe, a wet path flowmeter and a regulating valve are sequentially connected on the wet path air conveying pipe in series, the air outlet end of the wet path air conveying pipe is connected with the air inlet of a water tank, a main path flowmeter and a regulating valve are sequentially connected on the main path air conveying pipe in series, and the air outlet end of the main path air conveying pipe is connected with the other inlet of the three-way joint;
the water inlet valve, the water discharge valve, the pressure release valve, the main air inlet valve, the pressure reducing valve and the regulating valve are all electromagnetic valves, and the dew point sensor, the heater, the atomizer, the liquid level meter, the water temperature sensor, the air pressure sensor, the water inlet valve, the water discharge valve, the pressure release valve, the main air inlet valve, the pressure reducing valve, the regulating valve, the circulating water pump, the atomization flowmeter, the wet road flowmeter and the dry road flowmeter are all connected with the controller through signal lines.
The dew point control device for humidifying the furnace chamber of the annealing furnace is characterized in that: the humidifying pipe is provided with an electric heat tracing device, the atomization flowmeter is an ultrasonic flowmeter, the controller is a programmable controller, and the input and output equipment of the controller is a liquid crystal touch screen.
The utility model discloses during the use:
a water temperature sensor and a heater which adopt analog quantity signals form water temperature closed-loop control in the water tank, so that the temperature of pure water used for increasing the humidity can be accurately controlled, and the humidifying effect is achieved; the liquid level meter, the water inlet valve and the drain valve form liquid level closed-loop control to realize the function of automatically lifting the water level; when the pressure sensor measures that the steam pressure in the water tank is higher than the set pressure, the pressure release valve is opened, and the problem of safety caused by the fact that the water pressure overflows into the annealing furnace is avoided.
The water tank is pressurized by the circulating water pump, the humidifying water atomization effect is improved, the vapor pressure closed-loop control is formed by the air pressure sensor and the circulating water pump, the constant-pressure water mist effect is achieved, and the dew point control requirement in the annealing furnace under large flow is improved; meanwhile, the consumption of pure water is measured through the atomization flowmeter, the humidification consumption in the annealing furnace can be accurately mastered, and reliable analysis data is provided for standardization of process production.
After the dry nitrogen is input from the main gas pipe, one part of the dry nitrogen is input into the water tank through the wet path gas pipe to increase the humidity to become high-humidity nitrogen and then is output from the humidifying pipe, the other part of the dry nitrogen is directly input into the humidifying pipe through the main path gas pipe, and the dry nitrogen and the high-humidity nitrogen are mixed and then are adjusted to the nitrogen with the required humidity and input into the annealing furnace.
A dew point sensor and an adjusting valve on a wet path gas transmission pipe are adopted to form closed-loop control of wet path nitrogen, a wet path flowmeter displays the flow of the high-humidity nitrogen, driving equipment of a strip steel unit and an adjusting valve of a main path gas transmission pipe are adopted to form closed-loop control of the main path nitrogen, the main path flowmeter displays the flow of dry nitrogen, and the driving speed of the driving equipment of the strip steel unit is determined according to the specification of strip steel.
After the dry nitrogen and the high-humidity nitrogen are mixed in the humidifying pipe, part of the water vapor is condensed and lost due to temperature reduction in the way of inputting into the annealing furnace, and in order to avoid the phenomenon and improve the humidifying efficiency, an electric heat tracing device can be additionally arranged on the humidifying pipe.
By adopting the closed-loop control automatic adjusting method, the dew point change of the annealing furnace can be quickly responded, the dew point control precision reaches +/-2 ℃, the dew point is improved by 15-30 ℃, and the requirements of the strip steel pre-oxidation process are met.
The utility model discloses accessible remote operation, all parameter display surveyability are convenient for alternate adjustment humidification flow according to various belted steel production, convenient operation, and control is accurate, effectively changes dew point value in the annealing stove, has solved the belted steel stove in the alloy composition and has appeared the problem, has solved the difficult problem of large-traffic high dew point annealing stove humidification device control, improves the precision of the interior humidification dew point control of annealing stove greatly.
The utility model has the advantages that: convenient operation, high control precision, wide application range and improved quality of the strip steel.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Detailed Description
The invention is further illustrated by the following specific examples.
Example 1
A dew point control device for humidifying furnace chamber of annealing furnace comprises an annealing furnace 1, a water tank 2 and a controller 6, as shown in figure 1, the specific structure is as follows:
a dew point sensor 11 is arranged in the furnace chamber of the annealing furnace 1, and a humidifying gas inlet is arranged on the annealing furnace 1;
pure water with the volume not exceeding 1/2 is filled in the water tank 2, a heater 21 and an atomizer 22 are arranged in the water tank 2, the heater 21 is not arranged below the water surface of the pure water, the atomizer 22 is arranged above the water surface of the pure water, a liquid level meter 23 is arranged on one side of the water tank 2, a water temperature sensor 24 and a gas pressure sensor 25 are arranged on the other side of the water tank 2, a water inlet, a water outlet, a pressure relief opening, a gas inlet and a gas transmission opening which penetrate through an inner cavity are respectively arranged on the water tank 2, the water inlet, the pressure relief opening and the gas transmission opening are all higher than the water surface of the pure water, the water outlet and the water outlet are all arranged at the bottom of the water tank 2, and the gas inlet is lower than the water surface of the pure water;
the water inlet end of the main water inlet pipe 31 is connected with a pure water source, the main water inlet pipe 31 is connected with a water inlet valve 41 in series, the water outlet end of the main water inlet pipe 31 is connected with a water inlet of the water tank 2, the water inlet end of the atomized water pipe 32 is connected with a water outlet of the water tank 2, the atomized water pipe 32 is sequentially connected with a circulating water pump 51 and an atomized flow meter 52 in series, the water outlet end of the atomized water pipe 32 is connected with a water inlet of the atomizer 22, the water inlet end of the drain pipe 33 is connected with a water outlet of the water tank 2, the drain pipe 33 is connected with a drain valve 42 in series, the air inlet end of the pressure relief pipe 34 is connected with a pressure relief port of the water tank 2, the pressure relief pipe 34 is connected with a pressure relief valve 43 in series, and the water outlet end of the drain pipe 33 and the air relief end of the pressure relief pipe 34 are both connected with the main drain pipe 35;
the air inlet end of the humidifying pipe 36 is connected with the air conveying port of the water tank 2, the three-way joint 53 is provided with two inlets and one outlet, the three-way joint 53 is connected with the humidifying pipe 36 in series by one inlet and one outlet, and the air outlet end of the humidifying pipe 36 is connected with the humidifying air inlet of the annealing furnace 1;
the air inlet end of the main air pipe 37 is connected with a nitrogen source, the main air pipe 37 is sequentially connected with a total air inlet valve 44 and a pressure reducing valve 45 in series, the air outlet end of the main air pipe 37 is respectively connected with the air inlet ends of a wet path air pipe 38 and a dry path air pipe 39, the wet path air pipe 38 is sequentially connected with a wet path flow meter 54 and a regulating valve 46 in series, the air outlet end of the wet path air pipe 38 is connected with the air inlet of the water tank 2, the dry path air pipe 39 is sequentially connected with a dry path flow meter 55 and a regulating valve 46 in series, and the air outlet end of the dry path air pipe 39 is connected with the other inlet of the three-way joint 53;
the water inlet valve 41, the water outlet valve 42, the pressure release valve 43, the total air inlet valve 44, the pressure release valve 45 and the regulating valve 46 are all electromagnetic valves, the dew point sensor 11, the heater 21, the atomizer 22, the liquid level meter 23, the water temperature sensor 24, the air pressure sensor 25, the water inlet valve 41, the water outlet valve 42, the pressure release valve 43, the total air inlet valve 44, the pressure release valve 45, the regulating valve 46, the circulating water pump 51, the atomization flowmeter 52, the wet road flowmeter 54 and the dry road flowmeter 55 are all connected with the controller 6 through signal lines, and for the sake of simplicity and clarity, all signal lines are not drawn in fig. 1.
In this embodiment: the humidifying pipe 36 is provided with an electric tracing device 56, the atomization flowmeter 52 is an ultrasonic flowmeter, the controller 6 is a programmable controller, and the input and output equipment of the controller 6 is a liquid crystal touch screen.
When the present embodiment is used, the operation,
the water temperature sensor 24 and the heater 21 which adopt analog quantity signals form water temperature closed-loop control in the water tank 2, so that the temperature of pure water used for increasing the humidity can be accurately controlled, and the humidifying effect is achieved; the liquid level meter 23, the water inlet valve 41 and the water discharge valve 42 form liquid level closed-loop control to realize the function of automatically lifting the water level; when the pressure sensor 25 detects that the steam pressure in the water tank 2 is higher than the set pressure, the pressure release valve 43 is opened, so that the problem of safety caused by overflowing the water pressure into the annealing furnace 1 is avoided.
The water tank 2 is pressurized by the circulating water pump 51, the humidifying water atomization effect is improved, the vapor pressure closed-loop control is formed by the air pressure sensor 25 and the circulating water pump 51, the constant-pressure water mist effect is achieved, and the requirement of dew point control in the annealing furnace 2 under large flow is improved; meanwhile, the consumption of pure water is measured through the atomization flowmeter 52, so that the humidification consumption in the annealing furnace 2 can be accurately mastered, and reliable analysis data is provided for standardization of process production.
After the dry nitrogen is input from the main gas transmission pipe 37, one part of the dry nitrogen is input into the water tank 2 through the wet gas transmission pipe 38 to increase the humidity to be high-humidity nitrogen and then output from the humidifying pipe 36, the other part of the dry nitrogen is directly input into the humidifying pipe 36 through the main gas transmission pipe 39, and the nitrogen which is mixed with the dry nitrogen and the high-humidity nitrogen and adjusted to the required humidity is input into the annealing furnace 1.
A dew point sensor 11 and an adjusting valve 46 on a wet path gas transmission pipe 38 are adopted to form closed-loop control of wet path nitrogen, a wet path flowmeter 54 displays the flow rate of the high-humidity nitrogen, driving equipment of a strip steel unit and the adjusting valve 46 of a dry path gas transmission pipe 39 are adopted to form closed-loop control of the dry path nitrogen, a dry path flowmeter 55 displays the flow rate of the dry nitrogen, and the driving speed of the driving equipment of the strip steel unit is determined according to the specification of strip steel.
After the dry nitrogen and the high-humidity nitrogen are mixed in the humidifying pipe 36, part of the water vapor is condensed and lost due to temperature reduction in the way of inputting into the annealing furnace 1, and in order to avoid the phenomenon and improve the humidifying efficiency, an electric tracing device 56 can be additionally arranged on the humidifying pipe 36.
By the closed-loop control automatic adjustment method, the dew point change of the annealing furnace 2 can be quickly responded, so that the dew point control precision reaches +/-2 ℃, the dew point is increased by 15-30 ℃, and the requirements of the strip steel pre-oxidation process are met.
Claims (2)
1. The utility model provides a dew point controlling means for annealing stove furnace chamber humidification, includes annealing stove (1), is equipped with dew point transducer (11) in the furnace chamber of annealing stove (1), is equipped with the import of humidification gas on annealing stove (1), characterized by: also comprises a water tank (2) and a controller (6),
pure water with the volume not exceeding 1/2 is filled in the water tank (2), a heater (21) and an atomizer (22) are arranged in the water tank (2), the heater (21) is arranged below the water surface of the pure water, the atomizer (22) is arranged above the water surface of the pure water, a liquid level meter (23) is arranged on one side of the water tank (2), a water temperature sensor (24) and a gas pressure sensor (25) are arranged on the other side of the water tank (2), the water tank (2) is respectively provided with a water inlet, a water outlet, a pressure relief opening, a gas inlet and a gas transmission opening which penetrate through an inner cavity, the water inlet, the pressure relief opening and the gas transmission opening are all higher than the water surface of the pure water, the water outlet and the water outlet are all arranged at the bottom of the water tank (2), and the gas inlet is lower than the water surface of the pure water;
the water inlet end of the main water inlet pipe (31) is connected with a pure water source, the main water inlet pipe (31) is connected with a water inlet valve (41) in series, the water outlet end of the main water inlet pipe (31) is connected with the water inlet of the water tank (2), the water inlet end of the atomized water pipe (32) is connected with the water outlet of the water tank (2), the atomized water pipe (32) is sequentially connected with a circulating water pump (51) and an atomized flow meter (52) in series, the water outlet end of the atomized water pipe (32) is connected with the water inlet of the atomizer (22), the water inlet end of the drain pipe (33) is connected with the water outlet of the water tank (2), the drain pipe (33) is connected with a drain valve (42) in series, the air inlet end of the drain pipe (34) is connected with a pressure relief port of the water tank (2), the pressure relief pipe (34) is connected with a pressure relief valve (43) in series, and the water outlet end of the drain pipe (33) and the air relief end of the pressure relief pipe (34) are both connected with the main drain pipe (35);
the air inlet end of the humidifying pipe (36) is connected with the air delivery port of the water tank (2), the three-way joint (53) is provided with two inlets and one outlet, the three-way joint (53) is connected with the humidifying pipe (36) in series by one inlet and one outlet, and the air outlet end of the humidifying pipe (36) is connected with the humidifying air inlet of the annealing furnace (1);
the air inlet end of the main air pipe (37) is connected with a nitrogen source, the main air pipe (37) is sequentially connected with a total air inlet valve (44) and a pressure reducing valve (45) in series, the air outlet end of the main air pipe (37) is respectively connected with the air inlet ends of a wet path air pipe (38) and a dry path air pipe (39), the wet path air pipe (38) is sequentially connected with a wet path flow meter (54) and a regulating valve (46) in series, the air outlet end of the wet path air pipe (38) is connected with the air inlet of the water tank (2), the dry path air pipe (39) is sequentially connected with a dry path flow meter (55) and a regulating valve (46) in series, and the air outlet end of the dry path air pipe (39) is connected with the other inlet of the three-way joint (53);
the water inlet valve (41), the drain valve (42), the pressure release valve (43), the total air inlet valve (44), the pressure reducing valve (45) and the regulating valve (46) all adopt electromagnetic valves, and the dew point sensor (11), the heater (21), the atomizer (22), the liquid level meter (23), the water temperature sensor (24), the air pressure sensor (25), the water inlet valve (41), the drain valve (42), the pressure release valve (43), the total air inlet valve (44), the pressure reducing valve (45), the regulating valve (46), the circulating water pump (51), the atomization flowmeter (52), the wet road flowmeter (54) and the dry road flowmeter (55) are all connected with the controller (6) through signal lines.
2. The dew point control apparatus for humidifying the furnace chamber of an annealing furnace as set forth in claim 1, wherein: an electric tracing device (56) is arranged on the humidifying pipe (36), the atomizing flowmeter (52) is an ultrasonic flowmeter, the controller (6) is a programmable controller, and the input and output equipment of the controller (6) is a liquid crystal touch screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022207657.9U CN214088570U (en) | 2020-09-30 | 2020-09-30 | Dew point control device for humidifying furnace chamber of annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022207657.9U CN214088570U (en) | 2020-09-30 | 2020-09-30 | Dew point control device for humidifying furnace chamber of annealing furnace |
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| Publication Number | Publication Date |
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| CN214088570U true CN214088570U (en) | 2021-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022207657.9U Active CN214088570U (en) | 2020-09-30 | 2020-09-30 | Dew point control device for humidifying furnace chamber of annealing furnace |
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