CN219314983U - Evaporative cooler in converter flue gas dust removal system - Google Patents
Evaporative cooler in converter flue gas dust removal system Download PDFInfo
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- CN219314983U CN219314983U CN202223493182.XU CN202223493182U CN219314983U CN 219314983 U CN219314983 U CN 219314983U CN 202223493182 U CN202223493182 U CN 202223493182U CN 219314983 U CN219314983 U CN 219314983U
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Abstract
The application provides an evaporative cooler in a converter flue gas dust removal system, wherein a dividing wall type heat exchanger is arranged at the upper part of an inner cavity of the evaporative cooler, a water inlet of the dividing wall type heat exchanger is communicated with a water outlet of a circulating water pump, a water outlet of the dividing wall type heat exchanger is communicated with a water inlet of a steam drum, and a water inlet of the circulating water pump is communicated with a water outlet of the steam drum through a pipeline; a nozzle is also arranged in the inner cavity of the evaporative cooler, and the nozzle is positioned below the dividing wall type heat exchanger; the partition wall type heat exchanger is only used for absorbing heat in the flue gas with the temperature of 600 ℃ and above, and then the flue gas with the temperature of 600 ℃ is continuously cooled and dedusted by adopting a traditional spray cooling dedusting mode, so that a large amount of heat in the flue gas is recovered, a large amount of useful steam is generated, the structure is improved more simply, the realization is easy, the cost is lower, the cost performance of input and output is highest, and the energy saving and consumption reduction effects are obvious.
Description
Technical Field
The utility model relates to the technical field of converter flue gas dry dedusting equipment, in particular to an evaporative cooler in a converter flue gas dedusting system.
Background
The dry cleaning and recovering system for converter gas is a technological process for treating all dust-containing gas produced in cooling and cleaning smelting of converter gas and recovering CO-containing gas for future use. The average dust concentration of the recovered gas is less than or equal to 10mg/Nm 3 The average dust concentration of the diffused gas is less than or equal to 10mg/Nm 3 The noise of the factory boundary is less than or equal to 85db. The converter gas dry purification and recovery system mainly comprises: the system comprises a flue gas cooling system, a flue gas purifying system, a coal gas recycling system and a dust conveying system.
At present, a primary dust removal system of a converter generally adopts two modes: the OG method and the LT method, which are commonly known as wet and dry methods. The LT method is a popular dust removal mode at present, and has the advantages of energy saving, small occupied area and easy maintenance compared with the OG system. The LT method is: high-temperature flue gas (1400-1600 ℃) is cooled by a vaporization cooling flue, the temperature of the flue gas is reduced to 850-1000 ℃, then the flue gas is sprayed out by an Evaporation Cooler (EC), the flue gas is directly cooled to below 300 ℃, the sprayed water is completely evaporated, and the flue gas is subjected to quenching and tempering treatment while the water is sprayed for cooling, so that the specific resistance of dust is favorable for the capture of an electric dust collector. About 30% -40% of coarse dust in the evaporative cooler is settled to the bottom of the banana bend, and then the coarse dust can enter coarse dust recovery equipment for furnace feeding or be conveyed into a coarse dust bin through a chain type dust conveyer for periodic automobile outward transportation.
At present, the technical problems existing in the prior art are as follows:
(1) Although the LT method is energy-saving by 2/3 compared with the OG method, the front-end evaporative cooler (EC for short) still adopts water spraying and cooling to cool the flue gas at 900 ℃ to below 300 ℃, and a large amount of high-quality heat is wasted in the process, so that heat energy waste exists;
(2) The LT method needs to consume a large amount of soft water and nitrogen in the cooling process, and the heat of the LT method is converted into steam by about 60-70 kg/t;
(3) In the spraying process of the LT method, nitrogen can also enter into the gas along with the flue gas, and the heat value of the gas is affected.
Disclosure of Invention
The utility model aims to provide an evaporative cooler in a converter flue gas dust removal system, which is used for recovering waste heat in a steam form, realizing resource maximization, reducing cooling time, improving gas heat value and reducing soft water and nitrogen consumption.
In order to solve the technical problems, the technical scheme provided by the utility model is as follows:
an evaporation cooler in a converter flue gas dust removal system is in a vertical tower shape, a flue gas inlet of the evaporation cooler is positioned at the top of the evaporation cooler, a flue gas outlet of the evaporation cooler is positioned at the bottom of the evaporation cooler, a dividing wall type heat exchanger for absorbing heat in the flue gas is arranged at the upper part of an inner cavity of the evaporation cooler, a water inlet of the dividing wall type heat exchanger is communicated with a water outlet of a circulating water pump through a pipeline, a water outlet of the dividing wall type heat exchanger is communicated with a water inlet of a steam drum through a pipeline, and a water inlet of the circulating water pump is communicated with a water outlet of the steam drum through a pipeline;
the inner cavity of the evaporative cooler is also provided with a nozzle for spraying water mist, and the nozzle is positioned below the dividing wall type heat exchanger.
Preferably, the shape of the dividing wall type heat exchanger is a metal plate, a cooling water channel for cooling water circulation is formed in the metal plate, the metal plate is installed and fixed in a vertical direction posture, a plurality of metal plates are uniformly distributed and arranged along the annular circumference of the evaporative cooler, and a water outlet of the dividing wall type heat exchanger is positioned above the water inlet to form a cooling water channel for bottom water inlet and top water outlet.
Preferably, a plurality of fins for enlarging the heat exchange area are provided on the outer surface of the metal plate.
Preferably, an upper annular water return main pipe and a lower annular water inlet main pipe are arranged on the outer wall surface of the evaporative cooler, and the upper annular water return main pipe is positioned above the lower annular water inlet main pipe;
the water inlets of each metal plate are communicated with the corresponding water outlets on the lower annular water inlet main pipe in a one-to-one correspondence manner through pipelines;
the water outlets of each metal plate are communicated with the corresponding water inlets on the upper annular backwater main pipe in a one-to-one correspondence manner through pipelines;
the water outlet of the upper annular backwater main pipe is communicated with the water inlet of the steam drum through a pipeline;
the water inlet of the lower annular water inlet main pipe is communicated with the water outlet of the circulating water pump through a pipeline.
Preferably, the vertical height of the dividing wall type heat exchanger occupies 1/4-1/3 of the height of the inner cavity of the evaporative cooler.
Preferably, the distance between the nozzle and the bottom end of the dividing wall type heat exchanger is 20cm-50cm.
Preferably, the steam drum is provided with a steam outlet and a new supplementing water inlet.
Compared with the prior art, the application has the following beneficial technical effects:
(1) Because the high-temperature heat exchange below 900 ℃ mainly takes radiation, and the heat exchange below 600 ℃ only takes conduction, if the continuous recovery needs to be completed with huge volume, the on-site conditions are obviously not allowed, the heat above 600 ℃ is recovered, the equipment is simple and easy to realize, therefore, the application only uses the dividing wall type heat exchanger to absorb the heat in the flue gas below 600 ℃ and 850-1000 ℃ and the flue gas enters the evaporation cooler from the top of the tower and then is cooled into the flue gas below 600 ℃ through the dividing wall type heat exchanger, and then the flue gas below 600 ℃ is continuously cooled and dedusted by adopting the traditional spray cooling dedusting mode, thereby not only recovering a large amount of heat in the flue gas and generating a large amount of useful steam, but also realizing the structural improvement of the evaporation cooler more simply and easily, and having lower cost, so that the cost of technical improvement of the application is the highest in cost performance of the improvement and output.
(2) In the application, the lower area of the dividing wall type heat exchanger still adopts an aerosol water spray cooling mode, but equipment, water quantity and air quantity at the moment are very small, and the consumption of nitrogen and soft water can be effectively reduced.
(3) In this application, reduction of total flue gas treatment and dewatering: the reduction in flue gas treatment is approximately: 24000/0.804= 29850Nm 3 And/h, the reduction of the dewatering amount is basically equivalent to the reduction of the flue gas treatment amount, so that the heat load of the flue gas cooler is reduced and the secondary cooling water is reduced.
(4) In this application, increase of dust removal benefit: the reduction of the smoke amount brings about the reduction of the energy consumption of the electric dust removal fan.
(5) In this application, contrast dividing wall type heat exchanger's three kinds of structures of different wide fin plate type, equal wide light plate type, equal wide fin plate type, can know: the flue gas flow velocity at the center of the flue in the equal-width light plate type and the equal-width fin plate type is high, and short circuit is easy to occur to the flue gas; the flue gas flow velocity on the cross section of the unequal-width fin plate type divided wall heat exchanger adopted by the application is relatively uniform; the uneven flue gas velocity not only can reduce the overall heat exchange effect, but also can generate local long-time high-speed scouring and increase abrasion.
(6) In the application, the corresponding materials of the dividing wall type heat exchanger are selected according to the highest wall temperature, so that uniformity of heat exchange effect of each metal plate and steam-water circulation reliability at the worst flow field are effectively prevented from being damaged when the smoke is deflected, circulation deterioration and even stagnation are prevented, and wall temperature unevenness caused by the deflected flow is eliminated.
Drawings
Fig. 1 is a schematic structural diagram of an evaporative cooler in a flue gas dust removal system of a converter (wherein, for clarity of illustration, a tower wall, an upper annular water return header pipe, and a lower annular water inlet header pipe of the evaporative cooler are cut away);
in the figure: the device comprises an evaporation cooler 1, a dividing wall type heat exchanger 2, a circulating water pump 3, a steam drum 4, a nozzle 5, an upper annular water return header pipe 6 and a lower annular water inlet header pipe 7.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1: in the figure: the evaporative cooler 1, the dividing wall type heat exchanger 2, the circulating water pump 3, the steam drum 4, the nozzle 5, the upper annular backwater main pipe 6 and the lower annular water inlet main pipe 7.
The application provides an evaporative cooler in a converter flue gas dust removal system, wherein the evaporative cooler 1 is in a vertical tower shape, a flue gas inlet of the evaporative cooler 1 is positioned at the top of the evaporative cooler 1, a flue gas outlet of the evaporative cooler 1 is positioned at the bottom of the evaporative cooler 1, a dividing wall type heat exchanger 2 for absorbing heat in flue gas is arranged at the upper part of an inner cavity (a cavity in the tower) of the evaporative cooler 1, a water inlet of the dividing wall type heat exchanger 2 is communicated with a water outlet of a circulating water pump 3 through a pipeline, a water outlet of the dividing wall type heat exchanger 2 is communicated with a water inlet of a steam drum 4 through a pipeline, and a water inlet of the circulating water pump 3 is communicated with a water outlet of the steam drum 4 through a pipeline;
a nozzle 5 for spraying water mist is also arranged in the inner cavity (tower inner cavity) of the evaporative cooler 1, and the nozzle 5 is positioned below the dividing wall type heat exchanger 2.
In an embodiment of the application, the shape of the dividing wall type heat exchanger 2 is a metal plate, a cooling water channel for cooling water circulation is arranged in the metal plate, the metal plate is fixedly installed in a vertical direction posture, a plurality of metal plates are uniformly distributed and arranged along the annular circumference of the evaporative cooler 1, and a water outlet of the dividing wall type heat exchanger 2 is positioned above the water inlet to form a cooling water channel for bottom water inlet and top water outlet.
In one embodiment of the present application, a plurality of fins for enlarging a heat exchange area are provided on an outer surface of the metal plate.
In one embodiment of the application, an upper annular water return main pipe 6 and a lower annular water inlet main pipe 7 are arranged on the outer wall surface of the evaporative cooler 1, and the upper annular water return main pipe 6 is positioned above the lower annular water inlet main pipe 7;
the water inlets of each metal plate are communicated with the corresponding water outlets on the lower annular water inlet main pipe 7 in a one-to-one correspondence manner through pipelines;
the water outlet of each metal plate is communicated with the corresponding water inlet on the upper annular backwater main pipe 6 in a one-to-one correspondence manner through a pipeline;
the water outlet of the upper annular backwater main pipe 6 is communicated with the water inlet of the steam drum 4 through a pipeline;
the water inlet of the lower annular water inlet main pipe 7 is communicated with the water outlet of the circulating water pump 3 through a pipeline.
In one embodiment of the present application, the vertical height of the divided wall heat exchanger 2 occupies 1/4-1/3 of the height of the inner cavity of the evaporative cooler 1.
In one embodiment of the present application, the distance between the nozzle 5 and the bottom end of the divided wall heat exchanger 2 is 20cm-50cm.
In one embodiment of the present application, the steam drum 4 is provided with a steam outlet and a fresh makeup water inlet.
In this application, the drum 4 in the boiler is the most important compression element in the natural circulation boiler, and the effect of the drum 4 mainly has: (1): the connecting hub is used for three processes of heating, evaporating and overheating working media, so that the normal water circulation of the boiler is ensured; (2): the steam-water separation device and the continuous sewage discharging device are arranged in the boiler, so that the steam quality of the boiler is ensured; (3): a certain amount of water is contained, and the device has certain heat storage capacity and can alleviate the change speed of the steam pressure; (4): the steam drum 4 is provided with a pressure gauge, a water level gauge, an accident water discharge valve and other devices, so that the safe operation of the boiler is ensured.
The application provides a working principle of evaporative cooler in converter flue gas dust removal system: the flue gas from the converter enters a vaporization cooling flue first, then enters the evaporative cooler 1 from the top inlet of the evaporative cooler 1, moves from the top to the bottom in the evaporative cooler 1, and is discharged from the bottom outlet of the evaporative cooler 1;
the flue gas with the temperature of 850-1000 ℃ enters the evaporative cooler 1 from the top of the tower and then passes through the dividing wall type heat exchanger 2, and the flue gas and the dividing wall type heat exchanger 2 exchange heat, so that the flue gas is cooled to be below 600 ℃, and the dividing wall type heat exchanger 2 is used for absorbing heat in the flue gas with the temperature of 600 ℃ and above;
then the flue gas continues to move downwards, the flue gas below 600 ℃ contacts with atomized water sprayed by the nozzle 5, the flue gas is cooled by atomized water, and the flue gas is cooled and dedusted by adopting a traditional spray cooling dedusting mode.
The method and the device which are not described in detail in the utility model are all the prior art and are not described in detail.
The above description of the embodiments is only for aiding in the understanding of the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.
Claims (7)
1. An evaporative cooler in a converter flue gas dust removal system is in a vertical tower shape, a flue gas inlet of the evaporative cooler is positioned at the top of the evaporative cooler, and a flue gas outlet of the evaporative cooler is positioned at the bottom of the evaporative cooler;
the inner cavity of the evaporative cooler is also provided with a nozzle for spraying water mist, and the nozzle is positioned below the dividing wall type heat exchanger.
2. The evaporative cooler in the converter flue gas dust removal system according to claim 1, wherein the partition wall type heat exchanger is characterized in that the external shape of the partition wall type heat exchanger is a metal plate, cooling water channels for cooling water circulation are formed in the metal plate, the metal plate is installed and fixed in a vertical posture, the plurality of metal plates are uniformly distributed and arranged along the annular circumferential direction of the evaporative cooler, and water outlets of the partition wall type heat exchanger are positioned above the water inlets to form cooling water channels for bottom water inflow and top water outflow.
3. An evaporative cooler in a flue gas dust removal system for a rotary furnace according to claim 2, wherein a plurality of fins for enlarging the heat exchange area are provided on the outer surface of the metal plate.
4. The evaporative cooler in the converter flue gas dust removal system according to claim 2, wherein an upper annular backwater main pipe and a lower annular water inlet main pipe are arranged on the outer wall surface of the evaporative cooler, and the upper annular backwater main pipe is positioned above the lower annular water inlet main pipe;
the water inlets of each metal plate are communicated with the corresponding water outlets on the lower annular water inlet main pipe in a one-to-one correspondence manner through pipelines;
the water outlets of each metal plate are communicated with the corresponding water inlets on the upper annular backwater main pipe in a one-to-one correspondence manner through pipelines;
the water outlet of the upper annular backwater main pipe is communicated with the water inlet of the steam drum through a pipeline;
the water inlet of the lower annular water inlet main pipe is communicated with the water outlet of the circulating water pump through a pipeline.
5. An evaporative cooler in a flue gas dust removal system for a rotary furnace according to claim 1, wherein the vertical height of the dividing wall type heat exchanger occupies 1/4-1/3 of the height of the internal cavity of the evaporative cooler.
6. An evaporative cooler in a flue gas dust removal system for a rotary kiln according to claim 1, wherein the spacing between the nozzle and the bottom end of the dividing wall heat exchanger is 20cm to 50cm.
7. An evaporative cooler in a flue gas dust removal system for a rotary furnace according to claim 1, wherein the drum is provided with a steam outlet and a fresh make-up water inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223493182.XU CN219314983U (en) | 2022-12-27 | 2022-12-27 | Evaporative cooler in converter flue gas dust removal system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223493182.XU CN219314983U (en) | 2022-12-27 | 2022-12-27 | Evaporative cooler in converter flue gas dust removal system |
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| Publication Number | Publication Date |
|---|---|
| CN219314983U true CN219314983U (en) | 2023-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223493182.XU Active CN219314983U (en) | 2022-12-27 | 2022-12-27 | Evaporative cooler in converter flue gas dust removal system |
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