CN115950273B - High-temperature flue gas drying sludge treatment process for metal melting furnace - Google Patents
High-temperature flue gas drying sludge treatment process for metal melting furnace Download PDFInfo
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- CN115950273B CN115950273B CN202310021426.4A CN202310021426A CN115950273B CN 115950273 B CN115950273 B CN 115950273B CN 202310021426 A CN202310021426 A CN 202310021426A CN 115950273 B CN115950273 B CN 115950273B
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Abstract
The invention relates to the technical field of metal melting furnace flue gas and sludge treatment, in particular to equipment and a process for drying and sludge treatment of metal melting furnace high-temperature flue gas, which comprises a metal melting furnace high-temperature flue gas collecting device, a sludge drying device and a water dust removing device, wherein the high-temperature flue gas drying and sludge treatment process comprises the processes of monitoring and replacing the dryness and humidity of sludge, monitoring and cooling and dust removing the temperature of the metal melting furnace high-temperature flue gas and the like; the invention provides a set of automatic high-temperature flue gas treatment and sludge drying device for a metal melting furnace, which fully utilizes part of heat energy of high-temperature flue gas generated by the metal melting furnace, and relates to a sludge drying treatment process.
Description
Technical Field
The invention relates to the technical field of metal melting furnace flue gas sludge treatment, in particular to a metal melting furnace high-temperature flue gas drying sludge treatment process.
Background
Along with the rapid development of industry, the demand for metal is continuously rising, and the emission of a large amount of high-temperature dust-containing waste gas in the smelting process causes serious environmental pollution, so that not only is the physical and mental health of people seriously influenced, but also a large amount of heat energy is unnecessarily wasted, and the healthy and stable development of related industries is seriously restricted. The high-temperature dust-containing waste gas generated during metal smelting has the characteristics of high temperature (450-1400 ℃), fine dust particles (1-10 mu m), difficult sedimentation when suspended in the air, complex components, high purification requirement (less than 50mg/m < 3 >) and the like, and is the key point and the difficulty of controlling the atmospheric pollution, and the conventional mode of treating the part of waste gas is to cool and enter cloth bag dust removing equipment. However, the investment of the waste gas with high temperature and large air quantity is over one million, the cost is extremely high, and part of heat energy cannot be utilized, so that waste is caused; meanwhile, a large amount of sludge is generated in the sewage treatment process after metal smelting, which is usually used as dangerous waste treatment, but the generated sludge has high water content due to the limitation of the sewage treatment process, and the treatment cost is further increased when the generated sludge is directly used as dangerous waste.
The existing high-temperature flue gas and sludge treatment modes of the metal melting furnace are mostly treated by chemical reagents, the dosage and the component proportion of the chemical reagents are difficult to grasp, and the treatment cost is easy to increase. Therefore, under the advocacy of energy saving and efficiency improvement, how to utilize high-temperature waste gas to dry sludge and then treat the waste gas, so as to reduce the treatment cost of the waste gas and the hazardous waste amount of the sludge, and the method becomes a problem which needs to be solved in an urgent way.
Disclosure of Invention
In order to solve the defects in the background technology, the invention provides equipment and a process for drying sludge from high-temperature flue gas of a metal melting furnace, which can collect the high-temperature flue gas of the metal melting furnace and dry sludge to finish cooling and impurity removal of the high-temperature flue gas of the metal melting furnace, reduce the dangerous waste amount of sludge and realize utilization and treatment of the high-temperature flue gas of the metal melting furnace.
The invention solves the technical problems by adopting the following scheme: the utility model provides a metal melting furnace high temperature flue gas stoving sludge treatment equipment, includes the equipment main part, the equipment main part includes metal melting furnace high temperature flue gas collection device, mud drying device and water dust collector, between metal melting furnace high temperature flue gas collection device and the mud drying device, between mud drying device and the water dust collector respectively through inlet tube, the pipeline connection of giving vent to anger, through the return line connection between inlet tube and the pipeline of giving vent to anger, the position department that return line and inlet tube and pipeline of giving vent to anger are equipped with first switching-over valve and second switching-over valve respectively, be equipped with on the pipeline of giving vent to anger and be used for monitoring the pipeline gas temperature of giving vent to anger and then control first switching-over valve with the second switching-over valve switching-over carries out closed loop control's gas temperature sensor.
Further, the high-temperature flue gas collection device of the metal melting furnace comprises a dust removal bracket and a cyclone dust collector arranged on the dust removal bracket in a supporting mode, wherein the cyclone dust collector is connected with the metal melting furnace to collect high-temperature flue gas, and is connected with the sludge drying device through the air inlet pipeline to provide high-temperature flue gas for drying sludge.
Further, the sludge drying device comprises a sludge drying box and a sludge tray arranged in the sludge drying box, the sludge tray divides the interior of the sludge drying box into a lower-layer high-temperature area and an upper-layer low-temperature area, an air inlet communicated with the lower-layer high-temperature area is formed in the bottom of the sludge drying box, an air outlet communicated with the upper-layer low-temperature area is formed in the top of the sludge drying box, the air inlet is connected with an air inlet pipeline, and the air outlet is connected with an air outlet pipeline.
Further, the sludge tray is detachably arranged in the sludge drying box, bosses are arranged on two sides of the inner wall of the sludge drying box, grooves are formed in two sides of the sludge tray, and the bosses are matched with the grooves in a sliding manner and enable the sludge drying box to be kept airtight.
Further, a humidity sensor is arranged in the sludge drying box, and tray placing tables for bearing sludge trays are arranged on two sides of the sludge drying box.
Furthermore, a sludge water pan is arranged below the sludge tray, water leakage holes are formed in the sludge tray, and the size of the water leakage holes is adjusted according to the viscosity degree of the sludge.
Further, the water dust removing device comprises a water tank and a water tower arranged on the water tank, wherein the bottom end of the water tower is provided with an air inlet, and the air inlet is connected with the air outlet through the air outlet pipeline.
Further, the wind speed lifting assembly is arranged on the air inlet pipeline and comprises a wind speed lifting platform, a motor and a blower which are arranged on the wind speed lifting platform, the blower is inserted on the inner wall of the air inlet pipeline, and the motor is connected with the blower to drive the blower.
The high-temperature flue gas drying sludge treatment process of the metal melting furnace adopts the high-temperature flue gas drying sludge treatment equipment of the metal melting furnace, and comprises the following steps of:
if Tx is more than or equal to T, the first reversing valve controls the first air inlet channel to be closed, the second air inlet channel to be opened, meanwhile, the second reversing valve controls the first air outlet channel communicated with the reflux pipeline and the air outlet pipeline to be opened, and controls the second air outlet channel communicated with the air outlet pipeline and the water dust removing device to be closed, so that the air which does not reach the allowable discharge temperature enters the second air inlet channel through the first air outlet channel, enters the sludge drying box after being accelerated by the speed lifting assembly in the second air inlet channel, and is transferred to the step 3;
if Tx is smaller than T, the first reversing valve controls the first air inlet channel to be opened, the second air inlet channel to be closed, meanwhile, the second reversing valve controls the first air outlet channel communicated with the reflux pipeline and the air outlet pipeline to be closed, and controls the second air outlet channel communicated with the water dust removing device to be opened, so that the air reaching the allowable discharge temperature enters the water dust removing device through the second air outlet channel, and the step 6 is carried out;
and 6, dedusting the cooled gas in a water dedusting device, and discharging the cooled gas after reaching the standard.
In summary, the beneficial effects of the invention are as follows:
1. the invention fully utilizes the heat energy of the high-temperature flue gas generated by the metal melting furnace, and is connected with the drying treatment process of the sludge, and the high-temperature waste gas is utilized to dry the sludge and then treat the waste gas, so that the treatment cost of the waste gas is reduced, the hazardous waste amount of the sludge is also reduced, and the treatment cost of the waste gas in the later period is reduced.
2. The invention has the advantages that the dust-containing waste gas is equivalent to adding a filtering system through the sludge tray, the dust content is reduced, and the water dust removal equipment with lower cost is additionally arranged at the rear end, so that the treatment requirement is completely met.
3. The invention provides a set of automatic high-temperature flue gas treatment sludge drying device for a metal melting furnace, which avoids the contact of sludge, waste gas and the like with human bodies in the waste gas treatment and sludge drying processes, and has high automation degree, safety and high efficiency.
The foregoing description is only an overview of the technical solution of the present invention, and may be implemented according to the content of the specification in order to make the technical means of the present invention more clearly understood, and in order to make the above and other objects, features and advantages of the present invention more clearly understood, the following specific preferred embodiment is given by way of the following detailed description in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a schematic structural view of a high-temperature flue gas drying sludge treatment apparatus of the present embodiment;
fig. 2 is a sectional view of the sludge drying box of the present embodiment;
fig. 3 is a flowchart of the high temperature flue gas drying sludge treatment process of the present embodiment.
In the figure: 1. a cyclone dust collector; 2. an air intake duct; 3. a return line; 4. a sludge drying box; 5. a second reversing valve; 6. a gas temperature sensor; 7. an air outlet pipe; 8. a water tower; 9. a water tank; 10. a humidity sensor; 11. a sludge tray; 12. a tray placement table; 13. a blower; 14. a wind speed lifting platform; 15. a motor; 16. a first reversing valve; 17. a dust removal bracket; 18. a sludge water receiving disc; 19. an air inlet; 20. and an air outlet.
Description of the embodiments
In order that the invention may be more readily understood, a further description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
It should be noted that, as used herein, the terms "center," "upper," "lower," "front," "rear," "left," "right," "inner," "outer," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Unless otherwise indicated, the meaning of "a plurality" is two or more.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
As shown in FIG. 1, a metal melting furnace high-temperature flue gas drying sludge treatment equipment comprises an equipment main body, wherein the equipment main body comprises a metal melting furnace high-temperature flue gas collecting device, a sludge drying device and a water dedusting device, so that high-temperature flue gas generated during metal treatment can be collected under the action of the high-temperature flue gas collecting device, sludge is dried in the sludge drying device, the temperature of the high-temperature flue gas is reduced, when the high-temperature flue gas reaches the temperature of an emission standard, the high-temperature flue gas is discharged after being dedusted by the water dedusting device, the heat energy of the high-temperature flue gas is fully utilized, the temperature of the high-temperature flue gas is reduced, and the treatment cost of the sludge is reduced by utilizing the temperature of the flue gas, so that the dangerous waste amount of the sludge is reduced, and the treatment cost of later-stage waste gas is reduced, and the energy-saving and efficiency-increasing effects are achieved.
The high-temperature flue gas collecting device of the metal melting furnace and the sludge drying device and the water dedusting device are respectively connected through the air inlet pipeline 2 and the air outlet pipeline 7, so that the high-temperature flue gas collected by the high-temperature flue gas collecting device can be transmitted to the sludge drying device through the air inlet pipeline 2 for drying, and is transmitted to the water dedusting device through the air outlet pipeline 7 for dedusting after the temperature is reduced, and then the high-temperature flue gas is discharged, so that the treatment of the high-temperature flue gas is completed; the air inlet pipeline 2 and the air outlet pipeline 7 are connected through the return pipeline 3, so that high-temperature flue gas which does not reach the discharge temperature standard after the sludge is dried in the sludge drying device can enter the sludge drying device again through the return pipeline 3 to continuously release heat to dry the sludge, and the temperature of the high-temperature flue gas is reduced to the discharge standard and then enters the water dust removal device through the air outlet pipeline 7 to remove dust and then is discharged.
In order to control the transmission direction of the high-temperature flue gas, thereby fully utilizing the heat of the high-temperature flue gas and avoiding the discharge of the flue gas which does not reach the discharge standard, the embodiment is provided with a first reversing valve 16 and a second reversing valve 5 at the positions where the return pipeline 3 is connected with the air inlet pipeline 2 and the return pipeline 3 is connected with the air outlet pipeline 7, wherein the first reversing valve 16 can control a first air inlet channel of the air inlet pipeline 2 communicated with the sludge drying device and a second air inlet channel of the return pipeline 3 communicated with the sludge drying device, and the second reversing valve 5 can control a first air outlet channel of the return pipeline 3 communicated with the air outlet pipeline 7 and a second air outlet channel of the air outlet pipeline 7 communicated with the water dust removing device; the high-temperature flue gas collected by the high-temperature flue gas collecting device enters the sludge drying device through the first air inlet channel to dry and cool the sludge, when the temperature of the flue gas does not reach the emission standard, the first reversing valve 16 and the second reversing valve 5 respectively control the second air inlet channel and the first air outlet channel to be opened, so that the flue gas is discharged from the first air outlet channel and then enters the sludge drying device again through the second air inlet channel to continue to release heat and dry until the temperature is reduced to the emission standard, and then is discharged to the water dust removing device through the second air outlet channel.
The air temperature sensor for monitoring the temperature of the air in the air outlet pipeline 7 and controlling the reversing of the first reversing valve 16 and the second reversing valve 5 is arranged on the air outlet pipeline 7, and the temperature sensor is used for detecting the temperature of the released smoke, so that the flow direction of the smoke is controlled in a closed loop manner, the smoke discharge which does not reach the emission standard is avoided, the full utilization of the heat of the high-temperature smoke is realized, and the energy saving and efficiency increasing effects are achieved.
Specifically, as shown in fig. 1, the high-temperature flue gas collection device of the metal melting furnace in this embodiment includes a dust removal bracket 17 and a cyclone 1 mounted on the dust removal bracket 17, where the cyclone 1 is connected with the metal melting furnace, so as to collect high-temperature flue gas produced in the metal melting furnace, and meanwhile, an outlet of the cyclone 1 is connected with an air inlet pipe 2, so that the collected high-temperature gas can be transmitted to a sludge drying device through the air inlet pipe 2, and thus drying of sludge is realized.
As shown in fig. 1 and 2, the sludge drying device of the embodiment includes a sludge drying box 4 and a sludge tray 11 installed in the sludge drying box 4, the sludge tray 11 carries sludge to be dried, and splits the interior of the sludge drying box 4 into a lower-layer high-temperature region and an upper-layer low-temperature region, wherein an air inlet 19 communicated with the lower-layer high-temperature region is arranged at the bottom of the sludge drying box 4, an air outlet 20 communicated with the upper-layer low-temperature region is arranged at the top of the sludge drying box 4, and the air inlet 19 is connected with an air inlet pipeline 2, and the air outlet 20 is connected with an air outlet pipeline 7, so that high-temperature flue gas can enter the lower-layer high-temperature region at the bottom of the sludge drying box 4 from the air inlet 19 to dry the sludge carried on the sludge tray 11, and the flue gas after heat release and cooling enters the upper-layer low-temperature region of the sludge drying box 4, and is discharged from the air outlet 20 to complete cooling of the high-temperature flue gas and drying of the sludge.
As shown in fig. 2, the sludge tray 11 of the embodiment is detachably installed in the sludge drying box 4, so that the dried sludge can be taken out in time and put into the sludge to be dried; specifically, the two sides of the inner wall of the sludge drying box 4 in this embodiment are provided with bosses, and the two sides of the sludge tray 11 are provided with grooves, when the sludge tray 11 is installed, the bosses are embedded in the grooves and slide along the grooves, so that the sludge tray 11 is completely filled into the sludge drying box 4, and the sludge drying box 4 is kept airtight, thereby improving the drying effect of high-temperature flue gas and preventing heat loss.
The humidity sensor 10 is also installed in the sludge drying box 4 of the embodiment, so that the humidity of the sludge in the sludge drying box 4 can be detected, the dried sludge can be taken out in time, and a new sludge to be dried is put in; wherein, in order to be convenient for get and put mud, this embodiment has still set up the tray that is used for bearing the weight of mud tray 11 in mud stoving case 4 both sides and has placed platform 12, when humidity transducer 10 detects that the humidity of mud reaches the emission prescribed value, alright take out this mud tray 11 and place on one of them tray and place the platform 12 to put into mud stoving case 4 with the mud tray 11 that the bearing of another tray placed on the platform 12 is waited to dry mud, it is convenient to change, can avoid the steam loss of flue gas.
As shown in fig. 2, a sludge water pan 18 is also installed below the sludge tray 11 in the embodiment, and water leakage holes are formed in the sludge tray 11, so that water on the sludge can automatically drip into the sludge water pan 18 through the water leakage holes, and the drying efficiency of high-temperature flue gas is improved; in addition, the size of the water leakage hole is adjusted according to the viscosity degree of the sludge, so that the sludge can be prevented from falling into the sludge water pan 18 from the water leakage hole.
As shown in fig. 1, before the cooled flue gas is discharged to the outside, the flue gas needs to be dedusted by a water dedusting device, wherein the water dedusting device of the embodiment comprises a water tank 9 and a water tower 8 arranged on the water tank 9, the water tank 9 supplies water to the water tower 8, the bottom end of the water tower 8 is provided with an air inlet, the air inlet is connected with an air outlet 20 through an air outlet pipeline 7, the flue gas which releases heat and is cooled in the sludge drying box 4 enters the bottom of the water tower 8 through the air outlet pipeline 7, and impurities of dust attached to the gas are dispersed in the water in the process of rising to the top of the water tower 8, so that the separation of smoke dust and gas is realized, and the generated high-temperature flue gas of a metal melting furnace is converted into gas which accords with the emission standard.
As shown in fig. 1, the air inlet pipeline 2 of the embodiment is provided with an air speed lifting assembly, so that the air speed of the high-temperature flue gas collected by the high-temperature flue gas collecting device can be increased under the action of the air speed lifting assembly in the process of being transmitted to the sludge drying box 4, and the high-temperature flue gas can be blown to the sludge tray 11 from a lower high-temperature area, so that the drying effect of sludge can be improved; specifically, the wind speed lifting assembly of the embodiment comprises a wind speed lifting platform 14, a motor 15 and a blower 13, wherein the motor 15 and the blower 13 are installed on the wind speed lifting platform 14, the blower 13 is inserted on the inner wall of the air inlet pipeline 2 and provides power for high-temperature smoke in the pipeline, and the motor 15 is connected with the blower 13 to drive the blower 13 to rotate, so that the speed of the high-temperature smoke is accelerated.
As shown in fig. 3, this embodiment also provides a process for treating high-temperature flue gas drying sludge in a metal melting furnace, which adopts the above-mentioned high-temperature flue gas drying sludge treatment equipment, and includes the following steps:
if Tx is more than or equal to T, the first reversing valve 16 controls the first air inlet channel to be closed, the second air inlet channel to be opened, meanwhile, the second reversing valve 5 controls the first air outlet channel communicated with the reflux pipeline 3 and the air outlet pipeline 7 to be opened, and controls the second air outlet channel communicated with the air outlet pipeline 7 and the water dust removing device to be closed, so that the air which does not reach the allowable discharge temperature enters the second air inlet channel through the first air outlet channel, enters the sludge drying box 4 after being accelerated by the speed lifting assembly in the second air inlet channel, and is transferred to the step 3;
if Tx is smaller than T, the first reversing valve 16 controls the opening of the first air inlet channel, the second air inlet channel is closed, meanwhile, the second reversing valve 5 controls the closing of the first air outlet channel communicated with the reflux pipeline 3 and the air outlet pipeline 7, and controls the opening of the second air outlet channel communicated with the water dust removing device by the air outlet pipeline 7, so that the air reaching the allowable discharge temperature enters the water dust removing device through the second air outlet channel, and the step 6 is carried out;
and 6, dedusting the cooled gas in a water dedusting device, and discharging the cooled gas after reaching the standard, so as to finish the treatment of the high-temperature flue gas in the embodiment.
In summary, in the embodiment, part of heat energy of high-temperature flue gas generated by the metal melting furnace is fully utilized and is connected with a sludge drying treatment process, and the sludge is dried by using high-temperature waste gas and then is subjected to waste gas treatment, so that the treatment cost of the waste gas is reduced, the hazardous waste amount of the sludge is reduced, and the treatment cost of the waste gas in the later period is reduced; and in the waste gas treatment and sludge drying processes, the contact between sludge, waste gas and the like and human bodies is avoided, and the automatic degree is high, and the safety and the efficiency are high.
The above examples are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and modifications made by those skilled in the art based on the present invention are included in the scope of the present invention.
Claims (1)
1. The utility model provides a metal smelting furnace high temperature flue gas stoving sludge treatment process, adopts a metal smelting furnace high temperature flue gas stoving sludge treatment equipment, includes the equipment main part, the equipment main part includes metal smelting furnace high temperature flue gas collection device, mud drying device and water dust collector, between metal smelting furnace high temperature flue gas collection device and the mud drying device, between mud drying device and the water dust collector respectively through inlet channel (2), go out gas piping (7) and connect, connect through return line (3) between inlet channel (2) and the outlet channel (7), the position department that return line (3) and inlet channel (2) and outlet channel (7) are connected is equipped with first switching-over valve (16) and second switching-over valve (5) respectively, be equipped with on the outlet channel (7) and be used for monitoring outlet channel (7) gas temperature and control first switching-over valve (16) and second switching-over valve (5) switching-over and carry out closed loop control's gas temperature sensor (6);
the high-temperature flue gas collection device of the metal melting furnace comprises a dust removal bracket (17) and a cyclone dust collector (1) arranged on the dust removal bracket (17), wherein the cyclone dust collector (1) is connected with the metal melting furnace to collect high-temperature flue gas, and is connected with the sludge drying device through the air inlet pipeline (2) to provide high-temperature flue gas to dry sludge;
the sludge drying device comprises a sludge drying box (4) and a sludge tray (11) arranged in the sludge drying box (4), wherein the sludge tray (11) divides the interior of the sludge drying box (4) into a lower-layer high-temperature area and an upper-layer low-temperature area, an air inlet (19) communicated with the lower-layer high-temperature area is formed in the bottom of the sludge drying box (4), an air outlet (20) communicated with the upper-layer low-temperature area is formed in the top of the sludge drying box (4), the air inlet (19) is connected with the air inlet pipeline (2), and the air outlet (20) is connected with the air outlet pipeline (7);
the sludge tray (11) is detachably arranged in the sludge drying box (4), bosses are arranged on two sides of the inner wall of the sludge drying box (4), grooves are formed in two sides of the sludge tray (11), and the bosses are in sliding fit with the grooves and keep the sludge drying box (4) airtight;
a humidity sensor (10) is arranged in the sludge drying box (4), and tray placing tables (12) for bearing a sludge tray (11) are arranged on two sides of the sludge drying box (4);
a sludge water pan (18) is arranged below the sludge tray (11), water leakage holes are formed in the sludge tray (11), and the size of the water leakage holes is adjusted according to the viscosity degree of the sludge;
the water dust removing device comprises a water tank (9) and a water tower (8) arranged on the water tank (9), wherein the bottom end of the water tower (8) is provided with an air inlet, and the air inlet is connected with the air outlet (20) through the air outlet pipeline (7);
the wind speed lifting assembly comprises a wind speed lifting platform (14), a motor (15) and a blower (13) which are arranged on the wind speed lifting platform (14), the blower (13) is inserted on the inner wall of the air inlet pipeline (2), and the motor (15) is connected with the blower (13) to drive the blower (13);
the process is characterized by comprising the following steps of:
step 1, collecting high-temperature flue gas through a gas collecting hood, entering a collecting pipe network, sending the collected high-temperature flue gas into a cyclone dust collector (1) through the collecting pipe network, and firstly settling part of dust in the high-temperature flue gas entering the cyclone dust collector (1);
step 2, a first reversing valve (16) controls a first air inlet channel of the air inlet pipeline (2) communicated with the sludge drying device to be opened, and a second air inlet channel of the reflux pipeline (3) communicated with the sludge drying device to be closed, so that the settled high-temperature flue gas enters a sludge drying box (4) after being accelerated by a wind speed lifting assembly in the first air inlet channel;
step 3, the high-temperature flue gas entering the sludge drying box (4) dries the sludge, and the heat of the high-temperature flue gas is consumed so as to reduce the temperature of the high-temperature flue gas;
step 4, detecting the humidity of the sludge in the sludge tray (11) at any time by a dry-wet sensor in the sludge drying box (4), and when the humidity of the sludge reaches a discharge specified value or less, withdrawing the sludge tray (11) onto one tray placing table (12) and simultaneously placing the sludge tray (11) on the other tray placing table (12) into the sludge drying box (4);
step 5, the cooled gas in the sludge drying box (4) is discharged through a gas outlet pipeline (7), a gas temperature sensor (6) on the gas outlet pipeline (7) detects the cooled gas temperature Tx, the detection result is compared with the allowable discharge gas temperature T, and the first reversing valve (5) and the second reversing valve (5) are controlled according to the comparison result:
if Tx is more than or equal to T, the first reversing valve (16) controls the first air inlet channel to be closed, the second air inlet channel to be opened, meanwhile, the second reversing valve (5) controls the first air outlet channel which is communicated with the reflux pipeline (3) and the air outlet pipeline (7) to be opened, and controls the second air outlet channel which is communicated with the water dust removing device to be closed, so that the air which does not reach the allowable discharge temperature enters the second air inlet channel through the first air outlet channel, enters the sludge drying box (4) after being accelerated by the speed lifting component in the second air inlet channel, and is transferred to the step 3;
if Tx is smaller than T, the first reversing valve (16) controls the first air inlet channel to be opened, the second air inlet channel to be closed, meanwhile, the second reversing valve (5) controls the first air outlet channel which is communicated with the reflux pipeline (3) and the air outlet pipeline (7) to be closed, and controls the second air outlet channel which is communicated with the air outlet pipeline (7) and the water dust removing device to be opened, so that the air reaching the allowable discharge temperature enters the water dust removing device through the second air outlet channel, and the step 6 is carried out;
and 6, dedusting the cooled gas in a water dedusting device, and discharging the cooled gas after reaching the standard.
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| CN105347654A (en) * | 2015-11-02 | 2016-02-24 | 丁燕华 | Sludge drying method and dryer |
| CN206828346U (en) * | 2017-06-09 | 2018-01-02 | 重庆沙微谷环保节能科技有限公司 | Sludge waste heat cryogenic seal drying system |
| CN109631598A (en) * | 2018-12-06 | 2019-04-16 | 海南中航特玻科技有限公司 | A kind of all-oxygen combustion glass kiln denitration system and method based on flue gas recirculating technique |
| CN217131873U (en) * | 2022-02-17 | 2022-08-05 | 云南兴建水泥有限公司 | Cement kiln denitration, waste heat utilization and dust pelletizing system |
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