CN211424354U - Gas boiler for waste heat in metallurgical industry - Google Patents
Gas boiler for waste heat in metallurgical industry Download PDFInfo
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- CN211424354U CN211424354U CN201922087392.0U CN201922087392U CN211424354U CN 211424354 U CN211424354 U CN 211424354U CN 201922087392 U CN201922087392 U CN 201922087392U CN 211424354 U CN211424354 U CN 211424354U
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Abstract
The utility model discloses a gas boiler for metallurgical industry waste heat. The gas boiler for waste heat in the metallurgical industry comprises a processing unit, a boiler barrel, a first hearth and a second hearth connected with the first hearth, wherein a first combustor and a second combustor are respectively installed on the first hearth and the second hearth, an outlet of the second hearth is connected with a smoke outlet channel, and a first high-pressure superheater, a second high-pressure superheater, a first medium-pressure superheater, a third high-pressure superheater, a denitration device, a second medium-pressure superheater, an economizer and an air preheater are sequentially arranged in the smoke outlet channel; the boiler barrel is connected with the first hearth and the second hearth through pipelines to form a natural circulation system, the water feed pump, the economizer and the boiler barrel are sequentially connected, and a steam outlet of the boiler barrel is communicated with a steam inlet of the third high-pressure superheater; the third high-pressure superheater, the first high-pressure superheater and the second high-pressure superheater are sequentially connected; the second intermediate-pressure superheater is connected in series with the first intermediate-pressure superheater.
Description
Technical Field
The invention relates to the field of boilers, in particular to a gas boiler for waste heat in the metallurgical industry.
Background
At present, Chinese only uses a primary medium-pressure boiler to utilize the waste heat of blast furnace gas in the by-products of the metallurgical industry, and the utilization efficiency is low.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the gas boiler for the waste heat in the metallurgical industry, which can improve the utilization rate of the waste heat of the blast furnace gas in the metallurgical by-product.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
the utility model provides a gas boiler for waste heat in metallurgical industry, which comprises a water feeding pump, a processing unit, a boiler barrel, a first hearth and a second hearth connected with the first hearth, wherein the first hearth and the second hearth are respectively provided with a first burner and a second burner, the outlet of the second hearth is connected with a smoke outlet channel, and a first high-pressure superheater, a second high-pressure superheater, a first medium-pressure superheater, a third high-pressure superheater, a denitration device, a second medium-pressure superheater, an economizer and an air preheater are sequentially arranged in the smoke outlet channel;
a first air outlet channel and a second air outlet channel which are respectively matched with the first combustor and the second combustor are arranged on the outlet of the air preheater;
the boiler barrel is connected with the first hearth and the second hearth through pipelines to form a natural circulation system, the water feed pump, the economizer and the boiler barrel are sequentially connected, and a steam outlet of the boiler barrel is communicated with a steam inlet of the third high-pressure superheater;
a first steam inlet channel for receiving high-pressure saturated steam in a metallurgical byproduct is arranged on a steam inlet of the third high-pressure superheater, and the third high-pressure superheater, the first high-pressure superheater and the second high-pressure superheater are sequentially connected; a second steam inlet channel for receiving medium-pressure saturated steam in the metallurgical by-product is arranged on the second medium-pressure superheater, and the second medium-pressure superheater is sequentially connected with the first medium-pressure superheater;
the steam outlets of the first medium-pressure superheater and the second high-pressure superheater are respectively provided with a first temperature acquisition device and a second temperature acquisition device; the pipe walls of the first high-pressure superheater and the second high-pressure superheater are respectively provided with a third temperature acquisition device and a fourth temperature acquisition device which are used for acquiring the wall temperatures of the first high-pressure superheater and the second high-pressure superheater;
a fifth temperature acquisition device and a sixth temperature acquisition device are respectively installed at the smoke outlet of the second hearth and the inlet of the denitration device, and the processing unit is respectively connected with the display device and all the temperature acquisition devices;
the first combustor and the second combustor are connected with a fuel gas adjusting system, and a combustion-supporting air adjusting system is installed on the first air outlet channel and the second air outlet channel.
Further, the denitration device is a built-in SCR denitration device.
Furthermore, a third burner is installed in the second hearth, a third air outlet channel matched with the third burner is installed on the outlet of the air preheater, and the third burner and the third air outlet channel are respectively connected with a fuel gas adjusting system and a combustion-supporting air adjusting system.
Further, the mounting height of the third burner is higher than that of the second burner.
The invention has the beneficial effects that:
air is heated by an air preheater and then enters the first hearth and/or the second hearth, blast furnace gas (generally over one hundred degrees centigrade) which is cooled in byproducts in the metallurgical industry enters the first hearth and/or the second hearth through the first burner and/or the second burner, and the gas in the first hearth or the second hearth is combusted to generate high-temperature flue gas. The flue gas flows through a flue gas outlet channel to heat a first high-pressure superheater, a second high-pressure superheater, a first medium-pressure superheater, a third high-pressure superheater, a denitration device, a second medium-pressure superheater, an economizer and an air preheater, then enters an additional tail flue gas treatment device to reach the environmental protection requirement and then is discharged to the atmosphere, and water is treated by a water pump, the economizer and a boiler barrel and then is changed into high-pressure saturated steam to enter the third high-pressure superheater.
When high-pressure saturated steam and medium-pressure saturated steam exist in the metallurgical by-product, the high-pressure saturated steam enters the third high-pressure superheater through the first steam inlet pipeline. The medium-pressure saturated steam sequentially passes through the second steam inlet channel, the second medium-pressure superheater and the first medium-pressure superheater to form medium-pressure superheated steam, and the medium-pressure superheated steam flows out from a steam outlet of the second medium-pressure superheater for subsequent steam turbine power generation or other applications.
All the high-pressure saturated steam in the third high-pressure superheater sequentially passes through the first high-pressure superheater and the second high-pressure superheater to form high-pressure superheated steam, and the high-pressure superheated steam flows out from a steam outlet of the second high-pressure superheater for subsequent steam turbine power generation or other applications.
The combination of the first hearth, the second hearth, the first combustor, the second combustor, the air preheater fuel gas, the fuel gas regulating system and the combustion-supporting air regulating system enables a user to adjust the air inlet flow of the first combustor and/or the second combustor based on the temperatures collected by the first temperature collecting device, the second temperature collecting device, the third temperature collecting device, the fourth temperature collecting device, the fifth temperature collecting device and the sixth temperature collecting device, so that the temperature of the flue gas at the outlet of the second hearth (equivalent to the inlet of the first high-pressure superheater) is adjusted, and the temperature of the high-pressure superheated steam flowing out from the steam outlet of the second high-pressure superheater and the temperature of the medium-pressure superheated steam flowing out from the steam outlet of the second medium-pressure superheater can meet the requirements of subsequent steam turbine power generation or other applications; the safety accidents such as pipe explosion and the like caused by the over-standard wall temperature of the first high-pressure superheater or the second high-pressure superheater are avoided, so that the gas boiler for waste heat in the metallurgical industry can be well adapted to the working conditions without external high-pressure saturated steam and medium-pressure saturated steam; meanwhile, the optimal working temperature of the denitration device is maintained, so that the denitration device is ensured to operate smoothly and efficiently, and the content of NOx at the outlet (namely the outlet of the smoke outlet channel) of the waste heat gas boiler in the metallurgical industry is greatly reduced.
In conclusion, the gas boiler for waste heat in the metallurgical industry is combined with the combustion control method thereof, so that the utilization rate of the waste heat of the blast furnace gas in the metallurgical by-product is improved.
Drawings
Fig. 1 is a partial structural schematic diagram of a gas boiler for waste heat in the metallurgical industry.
Wherein, 1, a first combustor; 2. a second combustor; 3. a third burner; 4. a drum; 5. a first high pressure superheater; 6. a second high pressure superheater; 7. a first intermediate-pressure superheater; 8. a third high pressure superheater; 9. a denitration device; 10. a second intermediate-pressure superheater; 11. a coal economizer; 12. an air preheater; 13. a second hearth; 14. a first hearth.
Detailed Description
The following detailed description of the present invention will be provided in conjunction with the accompanying drawings to facilitate the understanding of the present invention by those skilled in the art. It should be understood that the embodiments described below are only some embodiments of the invention, and not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive step, without departing from the spirit and scope of the present invention as defined and defined by the appended claims, fall within the scope of protection of the present invention.
As shown in fig. 1, the gas boiler for waste heat in the metallurgical industry includes a water feed pump, a processing unit, a drum 4, a first furnace 14 and a second furnace 13 connected with the first furnace 14 (i.e. the first furnace 14 is communicated with the second furnace 13 in series), the first furnace 14 and the second furnace 13 are respectively provided with a first burner 1 and a second burner 2, an outlet of the second furnace 13 is connected with a smoke outlet channel, and a first high-pressure superheater 5, a second high-pressure superheater 6, a first medium-pressure superheater 7, a third high-pressure superheater 8, a denitration device 9, a second medium-pressure superheater 10, an economizer 11 and an air preheater 12 are sequentially arranged in the smoke outlet channel.
The outlet of the air preheater 12 is provided with a first air outlet channel and a second air outlet channel which are respectively matched with the first combustor 1 and the second combustor 2, namely the tail ends of the first air outlet channel and the second air outlet channel are respectively positioned in the first hearth 14 and the second hearth 13. That is, the air heated by the air preheater 12 can enter the first furnace 14 and the second furnace 13 through the first air outlet channel and the second air outlet channel respectively to match with the blast furnace gas sprayed by the first burner 1 and the second burner 2 respectively.
The boiler barrel 4 is connected with the first hearth 14 and the second hearth 13 through pipelines to form a natural circulation system, the feed water pump, the economizer 11 and the boiler barrel 4 are sequentially connected, and a steam outlet of the boiler barrel 4 is communicated with a steam inlet of the third high-pressure superheater 8. Water enters the economizer 11 through a feed pump to be heated and then enters the drum 4, and high-pressure saturated steam obtained by steam-water separation of the drum 4 enters the third high-pressure superheater 8. As for the natural circulation system, it is a type of natural circulation system formed with an existing boiler and a drum and pipes for naturally circulating water of the gas boiler.
A first steam inlet channel for receiving high-pressure saturated steam in a metallurgical byproduct is arranged on a steam inlet of the third high-pressure superheater 8, and the third high-pressure superheater 8, the first high-pressure superheater 5 and the second high-pressure superheater 6 are sequentially connected; the second intermediate-pressure superheater 10 is provided with a second steam inlet channel for receiving intermediate-pressure saturated steam in the metallurgical by-product, and the second intermediate-pressure superheater 10 is connected with the first intermediate-pressure superheater 7 in sequence. The temperature and pressure of each stage of heating surface are more reasonable due to the arrangement, the arrangement of the heating surfaces can be reduced, and the cost is reduced.
The steam outlets of the first intermediate-pressure superheater 7 and the second high-pressure superheater 6 are respectively provided with a first temperature acquisition device and a second temperature acquisition device; and the pipe walls of the first high-pressure superheater 5 and the second high-pressure superheater 6 are respectively provided with a third temperature acquisition device and a fourth temperature acquisition device which are used for acquiring the wall temperatures of the first high-pressure superheater and the second high-pressure superheater.
Fifth temperature acquisition device and sixth temperature acquisition device are installed respectively to 13 smoke outlets of second furnace and the entrance of denitrification facility 9, and processing unit is connected with display device and first to sixth temperature acquisition device respectively, and processing unit is used for supplying the signal that display device shows with the signal conversion of first to sixth temperature acquisition device collection.
The first combustor 1 and the second combustor 2 are connected with a fuel gas adjusting system, and a combustion-supporting air adjusting system is installed on the first air outlet channel and the second air outlet channel. The gas adjusting system is used for adjusting the gas flow entering the first combustor 1 and the second combustor 2, and the combustion-supporting air adjusting system is used for adjusting the air outlet flow of the first air outlet channel and the second air outlet channel.
In implementation, regarding the gas regulating system and the combustion-supporting air regulating system, it is similar to the regulation of the gas flow entering the burner and the air outlet flow of the air preheater 12 (i.e. the air inlet flow of the combustion-supporting air of the furnace chamber) in the prior art, and is implemented by installing regulating valves on the steam inlet pipes of the first burner 1 and the second burner 2, and installing regulating valves on the first air outlet channel and the second air outlet channel.
Wherein, the denitrification facility is a built-in SCR denitration facility.
The method for obtaining the high-pressure saturated steam and the medium-pressure saturated steam may be: and (3) heating medium-pressure water and high-pressure water by utilizing the temperature of the blast furnace gas in the process of reducing the temperature from more than one thousand ℃ to more than one hundred ℃ in the by-product in the metallurgical industry to respectively form the medium-pressure saturated steam and the high-pressure saturated steam.
As shown in fig. 1, a third burner 3 is installed in the second hearth 13, and a third air outlet channel matched with the third burner 3 is installed on the air preheater 12, that is, the end of the third air outlet channel is located in the second hearth 13. Meanwhile, the third burner 3 and the third air outlet channel are respectively connected with the gas regulating system and the combustion-supporting air regulating system and used for regulating the air inlet flow of the third burner 3 and the air outlet flow of the third air outlet channel. And then make this gas boiler for metallurgical industry waste heat's control range wider, and adjust the precision higher. Specifically, the installation height of the third burner 3 is higher than that of the second burner 2, so as to further improve the adjustment precision of the gas boiler for afterheat in the metallurgical industry.
When the same burner is operated, the temperature of the smoke outlet of the second hearth 13 is higher when the air inlet flow of the burner is larger.
Under the same flow, the temperature of the flue gas at the smoke outlet of the second hearth 13 is as follows:
the first burner 1 is operated < the first burner 1, the second burner and the third burner 3 are operated < the second burner 2 and the third burner 3 are operated.
The first temperature acquisition device, the second temperature acquisition device, the third temperature acquisition device, the fourth temperature acquisition device, the fifth temperature acquisition device, the sixth temperature acquisition device and the processing unit are WRKKD2-01A (B) type temperature sensor, WRKKD2-01A (B) type temperature sensor, WRKT-11A (B) type temperature sensor, WRKKD-02A (B) type temperature sensor and DCS control system respectively.
The combustion control method of the gas boiler for the waste heat in the metallurgical industry, which is provided by the scheme, comprises the following steps:
acquiring temperatures acquired by a first temperature acquisition device, a second temperature acquisition device, a third temperature acquisition device, a fourth temperature acquisition device, a fifth temperature acquisition device and a sixth temperature acquisition device;
and based on the temperatures acquired by all the temperature acquisition devices, the gas regulating system is used for regulating the gas inlet flow of the first combustor 1 and/or the second combustor 2, and the combustion-supporting air regulating system is used for regulating the air outlet flow of the first air outlet channel and/or the second air outlet channel.
Specifically, when the temperature collected by the first temperature collecting device is lower than a first set temperature, the temperature collected by the second temperature collecting device is lower than a second set temperature, the temperature collected by the sixth temperature collecting device is lower than a third set temperature, and high-pressure saturated steam starts to enter the first steam inlet channel or the medium-pressure saturated steam starts to enter the second steam inlet channel (i.e., when steam flow starts to exist), the air inlet flow of the first combustor 1 and/or the second combustor 2 is adjusted to reduce the total heat absorption amount of the first furnace 14 and the second furnace 13, and the air outlet flow of the first air outlet channel and/or the second air outlet channel is adjusted accordingly.
When the temperature collected by the third temperature collecting device is higher than the fourth set temperature, the temperature collected by the fourth temperature collecting device is higher than the fifth set temperature, the temperature collected by the sixth temperature collecting device is higher than the sixth set temperature, the high-pressure saturated steam in the first steam inlet channel begins to disappear (namely the first moment with the flow rate of 0) or the medium-pressure saturated steam in the second steam inlet channel begins to disappear, the air inlet flow of the first combustor 1 and/or the second combustor 2 is adjusted to improve the total heat absorption capacity of the first hearth 14 and the second hearth 13, and the air outlet flow of the first air outlet channel and/or the second air outlet channel is correspondingly adjusted.
In one example, the second furnace 13 is provided with a third burner 3, and the air preheater 12 is provided with a third air outlet channel matched with the third burner 3. Meanwhile, the third combustor 3 and the third gas outlet channel are respectively connected with a gas regulating system and a combustion-supporting air regulating system, in order to meet the requirements of a turbonator, the temperature of high-pressure superheated steam needs to reach more than 500 ℃, the temperature of medium-pressure superheated steam needs to reach more than 400 ℃, the allowable maximum arm temperature of the materials of the first high-pressure superheater 5, the second high-pressure superheater 6 and the third high-pressure superheater 8 is 580 ℃, the optimal working temperature interval of the built-in SCR denitration device is 320-400 ℃, the first set temperature is 510 ℃, the second set temperature is 410 ℃, the third set temperature is 320 ℃, the fourth set temperature is 570 ℃, the fifth set temperature is 570 ℃ and the sixth set temperature is 390 ℃.
Regarding the adjustment of the intake air flow of the first combustor 1, the second combustor 2 and the third combustor 3, the adjustment may be performed by manual step-by-step fine adjustment or automatically by using a processing unit in a manner of step-by-step fine adjustment at set intervals until the real-time temperature collected by the corresponding temperature collection device meets the requirement. When the air inlet flow rates of the first combustor 1, the second combustor 2 and the third combustor 3 are adjusted, the air outlet flow rates of the first air outlet channel, the second air outlet channel and the third air outlet channel also need to be adjusted correspondingly.
Claims (4)
1. The gas boiler for waste heat in the metallurgical industry is characterized by comprising a water feeding pump, a processing unit, a boiler barrel (4), a first hearth (14) and a second hearth (13) connected with the first hearth (14), wherein a first combustor (1) and a second combustor (2) are respectively installed on the first hearth (14) and the second hearth (13), an outlet of the second hearth (13) is connected with a smoke outlet channel, and a first high-pressure superheater (5), a second high-pressure superheater (6), a first medium-pressure superheater (7), a third high-pressure superheater (8), a denitration device (9), a second medium-pressure superheater (10), an economizer (11) and an air preheater (12) are sequentially arranged in the smoke outlet channel;
a first air outlet channel and a second air outlet channel which are respectively matched with the first combustor (1) and the second combustor (2) are arranged on the outlet of the air preheater (12);
the boiler barrel (4) is connected with the first hearth (14) and the second hearth (13) through pipelines to form a natural circulation system, the feed water pump, the economizer (11) and the boiler barrel (4) are sequentially connected, and a steam outlet of the boiler barrel (4) is communicated with a steam inlet of the third high-pressure superheater (8);
a first steam inlet channel for receiving high-pressure saturated steam in a metallurgical byproduct is arranged on a steam inlet of the third high-pressure superheater (8), and the third high-pressure superheater (8), the first high-pressure superheater (5) and the second high-pressure superheater (6) are sequentially connected; a second steam inlet channel for receiving medium-pressure saturated steam in a metallurgical byproduct is arranged on the second medium-pressure superheater (10), and the second medium-pressure superheater (10) is sequentially connected with the first medium-pressure superheater (7);
a first temperature acquisition device and a second temperature acquisition device are respectively arranged on steam outlets of the first medium-pressure superheater (7) and the second high-pressure superheater (6); the pipe walls of the first high-pressure superheater (5) and the second high-pressure superheater (6) are respectively provided with a third temperature acquisition device and a fourth temperature acquisition device for acquiring the wall temperature of each high-pressure superheater;
a fifth temperature acquisition device and a sixth temperature acquisition device are respectively installed at the smoke outlet of the second hearth (13) and the inlet of the denitration device (9), and the processing unit is respectively connected with the display device and all the temperature acquisition devices;
the first combustor (1) and the second combustor (2) are connected with a fuel gas adjusting system, and a combustion-supporting air adjusting system is installed on the first air outlet channel and the second air outlet channel.
2. The gas boiler for the waste heat in the metallurgical industry as claimed in claim 1, wherein the denitration device (9) is a built-in SCR denitration device.
3. The gas boiler for the waste heat in the metallurgical industry as claimed in claim 1 or 2, wherein a third burner (3) is installed in the second hearth (13), a third air outlet channel matched with the third burner (3) is installed on an outlet of the air preheater (12), and the third burner (3) and the third air outlet channel are respectively connected with a gas regulating system and a combustion-supporting air regulating system.
4. The metallurgical industry waste heat gas boiler according to claim 3, characterized in that the third burner (3) is mounted at a higher height than the second burner (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922087392.0U CN211424354U (en) | 2019-11-28 | 2019-11-28 | Gas boiler for waste heat in metallurgical industry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922087392.0U CN211424354U (en) | 2019-11-28 | 2019-11-28 | Gas boiler for waste heat in metallurgical industry |
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| Publication Number | Publication Date |
|---|---|
| CN211424354U true CN211424354U (en) | 2020-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922087392.0U Active CN211424354U (en) | 2019-11-28 | 2019-11-28 | Gas boiler for waste heat in metallurgical industry |
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| CN (1) | CN211424354U (en) |
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- 2019-11-28 CN CN201922087392.0U patent/CN211424354U/en active Active
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