CN212451137U - Energy-saving sludge drying device - Google Patents

Energy-saving sludge drying device Download PDF

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Publication number
CN212451137U
CN212451137U CN202020756876.XU CN202020756876U CN212451137U CN 212451137 U CN212451137 U CN 212451137U CN 202020756876 U CN202020756876 U CN 202020756876U CN 212451137 U CN212451137 U CN 212451137U
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China
Prior art keywords
steam
outlet
cavity
cooling water
sludge
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CN202020756876.XU
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Chinese (zh)
Inventor
孙家喜
屠文峰
徐晶
唐松林
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Wuxi Qingcheng Equipment Technology Co., Ltd
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Jiangsu Tianniu Environmental Protection Technology Co ltd
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Abstract

The utility model discloses an energy-saving sludge drying device, which comprises a drying device, a double-screw discharge pump, a gas washer and a horizontal tube falling film evaporator, wherein a sludge stirring cavity is arranged in the drying device, a steam cavity is wrapped outside the sludge stirring cavity, and the sludge stirring cavity is provided with a feed inlet, a dry sludge outlet and a secondary steam outlet; the steam cavity is provided with a steam inlet and a steam condensate outlet; a heat exchange tube is arranged in the horizontal tube falling film evaporator, and a cooling water cavity is wrapped outside the heat exchange tube; the secondary steam outlet is connected with the gas washer and then connected with the heat exchange tube; the steam condensate outlet is connected with the cooling water cavity through a drain valve, and the low-pressure steam outlet of the cooling water cavity is connected with the steam inlet through a compressor. The utility model discloses can prevent that flying dust and dust that traditional silt hot air drying brought from to the influence of system indirect heating equipment efficiency, but also can reuse the secondary steam waste heat, improved system steam availability factor, the energy consumption is low, and the feature of environmental protection is high, and use cost is low.

Description

Energy-saving sludge drying device
Technical Field
The utility model relates to a sludge drying and resource utilization's environmental protection complete sets field especially involves an energy-saving sludge drying device.
Background
The water content of the sludge dehydrated by filter pressing or other mechanical methods is still 60-75%, the sludge drying mainly adopts the technical means of percolation or evaporation and the like to remove most of water in the sludge, and the traditional sludge drying process generally adopts natural evaporation facilities such as a sludge drying bed and the like. At present, both direct heat exchange drying and indirect heat exchange drying processes have the common defects of high energy consumption and low heat exchange efficiency of equipment. The conventional equipment is a single-channel rotary dryer, is suitable for drying urban sludge, is internally provided with a depolymerization mechanism, a movable grate type wing plate, a cleaning device, a crushing device and the like, and can dry viscous materials which cannot be treated by a common rotary dryer. The residual heat gas such as hot air generated by a coal-fired hot air furnace, boiler tail gas or thermoelectric steam and the like is used as a drying heat source, but the use efficiency of the heat source is low, and the main reason is that the residual heat is still relatively large due to the heat source medium passing through a drying device and cannot be well utilized or recovered. At present, the power consumption per ton of the most energy-saving low-temperature (< 75 ℃) heat pump drying equipment is still as high as 180-200kwh, and meanwhile, dust is inevitably carried in the hot air closed circulation, so that a dust removal filter screen is blocked, the efficiency of a heat pump evaporator and a condenser is reduced, and the attenuation occurs along with the working time, so that the energy consumption of the drying device is increased. In the heating and drying process, the organic components of the dried tail gas are complex, the environment is affected, and the tail gas cannot be discharged randomly. Although the organic working medium adopted by the heat pump is continuously improved and improved, the influence of the organic working medium on the environment is not small.
SUMMERY OF THE UTILITY MODEL
The utility model provides an energy-saving sludge drying device for solving the problem of higher energy consumption of the existing sludge drying, which comprises a drying device 2, a double-screw discharge pump 1, a gas washer 5 and a horizontal tube falling film evaporator 6, wherein a sludge stirring cavity 25 is arranged in the drying device 2, a steam cavity 26 is wrapped outside the sludge stirring cavity 25, the sludge stirring cavity 25 is not communicated with the steam cavity 26, the sludge stirring cavity 25 is provided with a feed inlet 22, a dry sludge outlet and a secondary steam outlet 23, the feed inlet 22 is used for introducing raw material wet sludge, and the dry sludge outlet is connected with the double-screw discharge pump 1; the steam cavity 26 is provided with a steam inlet 21 and a steam condensate outlet 24;
a heat exchange tube is arranged in the horizontal tube falling-film evaporator 6, a cooling water cavity is wrapped outside the heat exchange tube, and the heat exchange tube is not communicated with the cooling water cavity; the secondary steam outlet 23 is connected with the air inlet of the gas scrubber 5, and the air outlet of the gas scrubber 5 is connected with the inlet of the heat exchange tube in the horizontal tube falling film evaporator 6; the steam condensate outlet 24 is connected with a cooling water cavity in the horizontal tube falling-film evaporator 6 through the drain valve 3, the cooling water cavity is also provided with a low-pressure steam outlet, and the low-pressure steam outlet is connected with the steam inlet 21 through the steam compressor 9.
Preferably, the heat exchange tube in the horizontal tube falling-film evaporator 6 is also provided with a secondary condensed water outlet and a non-condensable gas outlet, the non-condensable gas outlet is connected with a vacuum pump 8, and the non-condensable gas is discharged by a high-efficiency vacuum pump and is treated by tail gas, so that the pollution of the dried tail gas to the environment is avoided; the outlet of the secondary condensed water is connected with the water inlet of the gas washer 5.
Preferably, the air inlet of the gas washer 5 is arranged at the top of the gas washer, the upper part in the gas washer 5 is also provided with a gas washing spray header, the water outlet at the bottom of the gas washer 5 is connected with the gas washing spray header through a secondary condensate circulating pump 4, and the secondary condensate circulating pump 4 is used for pumping secondary condensate water into the gas washer and outputting water at the lower part in the gas washer into the gas washing spray header for spraying. The sprayed water falls into the lower part of the gas washer after gas washing to be converged with secondary condensed water from a secondary condensed water outlet, and then is input into the gas washing spray header by a secondary condensed water circulating pump, and after multiple cycles, biochemical treatment or secondary treatment is carried out by a secondary condensed water circulating discharge system.
Preferably, a cooling water spray head is further arranged at the top of the cooling water cavity, the cooling water spray head is connected with the condensate pump 10, and the condensate pump 10 pumps the cooling water in the cooling water cavity into the cooling water spray head. Steam condensate enters the cooling water cavity and is subjected to flash evaporation cooling, the cooled steam condensate is used as cooling water in the cooling water cavity, the steam condensate is sprayed out from the cooling water spray header through the condensate pump to be sprayed on the outer wall of the heat exchange tube, most of the steam is heated by secondary steam in the heat exchange tube and then is converted into low-pressure steam, and the low-pressure steam is heated by the steam compressor to increase the temperature and the pressure and then is converted into a heat source of the drying equipment; and a small part of the cooling water falls into the bottom of the cooling water cavity to be converged with the cooling water after flash evaporation and temperature reduction, and then the cooling water is pumped into the cooling water spray head by the condensate pump, so that the cooling water can be used for a long time without treatment. And the bottom of the cooling water cavity of the flat tube falling-film evaporator 6 is also provided with a water replenishing port which is connected with an external water source so as to replenish cooling water for the cooling water cavity.
The utility model has the advantages that:
the invention can not only prevent the influence of fly ash and dust on the efficiency of the system heat exchange equipment caused by the traditional sludge hot air drying, but also can repeatedly utilize the waste heat of secondary steam to replace the steam used by the traditional drying equipment, thereby improving the steam use efficiency of the system, and having low system energy consumption, high environmental protection and low use cost.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic diagram of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "connected", and the like are to be construed broadly, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The energy-saving sludge drying device shown in fig. 1 comprises a drying device 2, a double-screw discharge pump 1, a gas washer 5 and a horizontal tube falling film evaporator 6, wherein a sludge stirring cavity 25 is arranged in the drying device 2, a steam cavity 26 is wrapped outside the sludge stirring cavity 25, the sludge stirring cavity 25 is not communicated with the steam cavity 26, the sludge stirring cavity 25 is provided with a feed inlet 22, a dry sludge outlet and a secondary steam outlet 23, the feed inlet 22 is used for feeding raw material wet sludge, and the dry sludge outlet is connected with the double-screw discharge pump 1; the steam cavity 26 is provided with a steam inlet 21 and a steam condensate outlet 24; a heat exchange tube is arranged in the horizontal tube falling-film evaporator 6, a cooling water cavity is wrapped outside the heat exchange tube, and the heat exchange tube is not communicated with the cooling water cavity; the secondary steam outlet 23 is connected with the air inlet of the gas scrubber 5, and the air outlet of the gas scrubber 5 is connected with the inlet of the heat exchange tube in the horizontal tube falling film evaporator 6; the steam condensate outlet 24 is connected with a cooling water cavity in the horizontal tube falling-film evaporator 6 through the drain valve 3, the cooling water cavity is also provided with a low-pressure steam outlet, and the low-pressure steam outlet is connected with the steam inlet 21 through the steam compressor 9. The top in the cooling water cavity is also provided with a cooling water spray header, the cooling water spray header is connected with a condensate pump 10, the condensate pump 10 pumps the cooling water in the cooling water cavity into the cooling water spray header, steam condensate entering the cooling water cavity is cooled through negative pressure flash evaporation, the cooled steam condensate is used as cooling water in the cooling water cavity, the steam condensate is sprayed out of the cooling water spray header through the condensate pump to be sprayed on the outer wall of the heat exchange tube, most of the steam is heated by secondary steam in the heat exchange tube and then converted into low-pressure steam, and the low-pressure steam is heated by a positive pressure compressor to increase the temperature and pressure and then is used as a heat source of the drying equipment; and a small part of the cooling water falls into the bottom of the cooling water cavity to be converged with the cooling water after flash evaporation and temperature reduction, and then the cooling water is pumped into the cooling water spray head by the condensate pump, so that the cooling water can be used for a long time without treatment.
And because the medium water can be converted into low-pressure steam after being heated by the secondary steam, so that the medium water in the medium water cavity is prevented from being lacked, a water replenishing port is also arranged at the bottom of the medium water cavity and is connected with an external water source so as to replenish the medium water to the medium water cavity. In this device, water/steam is initially introduced from a water supply port, and then the steam is introduced into a steam chamber 26 as a heat source after the temperature of the steam is raised and pressurized by a steam compressor. The whole process is circulated continuously, and the latent heat of the water in the sludge in the process of evaporating to condensing is fully utilized through steam compression, so that the effect of drying the sludge by using a small amount of electric energy is achieved.
The heat exchange tube in the horizontal tube falling-film evaporator 6 is also provided with a secondary condensed water outlet and a non-condensable gas outlet, the secondary condensed water outlet is connected with a water inlet of the gas washer 5, an air inlet of the gas washer 5 is arranged at the top of the gas washer, a gas washing spray header is further arranged on the upper portion in the gas washer 5, a water outlet in the bottom of the gas washer 5 is connected with the gas washing spray header through a secondary condensed water circulating pump 4, and the secondary condensed water circulating pump is used for pumping secondary condensed water into the gas washer and outputting water on the lower portion in the gas washer into the gas washing spray header for spraying. The sprayed water falls into the lower part of the gas washer after gas washing to be converged with secondary condensed water from a secondary condensed water outlet, and is pumped to a gas washing spray header by a secondary condensed water circulating pump, and after multiple cycles, biochemical treatment or secondary treatment is carried out by a secondary condensed water circulating discharge system. The non-condensable gas outlet is connected with a vacuum pump 8, the non-condensable gas is discharged through the vacuum pump, and the non-condensable gas is treated by tail gas after being discharged, so that the pollution of the dried tail gas to the environment is avoided. During tail gas treatment, according to the tail gas composition, choose to purchase current exhaust-gas treatment equipment can, like the exhaust gas deodorizing device of the auspicious cloud environmental protection engineering limited company of river north.
The utility model discloses a theory of operation does: the sludge (the water content is about 65-80%) dehydrated by a conventional mechanical method is sent into a drying device, steam with the temperature of 130-160 ℃ is introduced into a hot steam cavity of the drying device, under the indirect heating condition of the steam, the water in the sludge in a sludge stirring cavity is continuously evaporated and converted into secondary steam, and the secondary steam removes a small amount of dust and soluble gas carried in the secondary steam through a gas scrubber. The purified secondary gas enters a heat exchange pipe of the horizontal pipe falling-film evaporator to serve as a heat source to heat medium water outside the heat exchange pipe, secondary steam is condensed in the heat exchange pipe after heat exchange to be converted into secondary condensate water, and the secondary condensate water is discharged to a gas washer through a secondary condensate water circulating pump to serve as gas washing water. The non-condensable gas in the secondary steam is discharged out of the evaporator through a vacuum pump for subsequent treatment.
Medium water outside the heat exchange pipe in the horizontal pipe falling-film evaporator is evaporated and converted into low-pressure steam under the heating of secondary sludge steam, and the low-pressure steam is heated to 130-160 ℃ as a heating source of drying equipment after the temperature and the pressure of the low-pressure steam are raised by a steam compressor. The steam is condensed and converted into pressurized steam condensate through heat exchange in a hot steam cavity of drying equipment, the partial condensate flows into a cooling water cavity of the horizontal tube falling-film evaporator after being decompressed through a drain valve, the temperature of the condensate is still up to 120-150 ℃, the condensate enters the horizontal tube falling-film evaporator and is cooled through negative pressure flash evaporation of a compressor, the cooled steam condensate is sprayed on the outer wall of a heat exchange tube through a condensate pump, and the steam condensate is heated by sludge secondary steam in the heat exchange tube and converted into low-pressure steam. And the dehydrated dry sludge is discharged out of the drying equipment by a screw conveying pump.
The utility model adopts the gas washer to purify and deodorize the secondary steam evaporated by drying, and simultaneously discharges the non-condensable medium and the organic medium in the sludge secondary steam through the vacuum pump, thereby avoiding the pollution of the drying tail gas to the environment; the method adopts the method that secondary steam of sludge is heated in a heat exchange pipe, secondary condensate water is subjected to flash evaporation and cooling in a horizontal pipe falling film evaporator, and a steam compressor is adopted for pressurization and temperature rise to carry out circulating indirect heating on sludge drying equipment, so that the system has high heat efficiency, medium recycling, low use cost, low system energy consumption and high environmental protection property. Through multiple experiments and calculation, when the pressure ratio of the inlet to the outlet of the steam compressor in the technical scheme is in the range of 4-8, the efficiency of drying sludge is highest, and in the range, the power consumption of the compressor for evaporating 1 ton of water is only 90-130kwh, so that the energy consumption is low.
In light of the above, the present invention is not limited to the above embodiments, and various changes and modifications can be made by the worker without departing from the scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (5)

1. The utility model provides an energy-saving sludge drying device which characterized by: the drying device comprises a drying device (2), a double-screw discharge pump (1), a gas washer (5) and a horizontal tube falling film evaporator (6), wherein a sludge stirring cavity (25) is arranged in the drying device (2), a steam cavity (26) is wrapped outside the sludge stirring cavity (25), the sludge stirring cavity (25) is not communicated with the steam cavity (26), the sludge stirring cavity (25) is provided with a feed inlet (22), a dry sludge outlet and a secondary steam outlet (23), the feed inlet (22) is used for introducing raw material wet sludge, and the dry sludge outlet is connected with the double-screw discharge pump (1); the steam cavity (26) is provided with a steam inlet (21) and a steam condensate outlet (24);
a heat exchange tube is arranged in the horizontal tube falling film evaporator (6), a cooling water cavity is wrapped outside the heat exchange tube, and the heat exchange tube is not communicated with the cooling water cavity;
the secondary steam outlet (23) is connected with the air inlet of the air washer (5), and the air outlet of the air washer (5) is connected with the inlet of the heat exchange tube in the horizontal tube falling film evaporator (6); the steam condensate outlet (24) is connected with a cooling water cavity in the horizontal tube falling-film evaporator (6) through the drain valve (3), the cooling water cavity is also provided with a low-pressure steam outlet, and the low-pressure steam outlet is connected with the steam inlet (21) through the steam compressor (9).
2. The energy-saving sludge drying device as set forth in claim 1, wherein: the heat exchange tube in the horizontal tube falling-film evaporator (6) is also provided with a secondary condensed water outlet and a non-condensable gas outlet, the non-condensable gas outlet is connected with a vacuum pump (8), and the secondary condensed water outlet is connected with a water inlet of the gas washer (5).
3. The energy-saving sludge drying device as set forth in claim 2, wherein: the air inlet of the air washer (5) is arranged at the top of the air washer, the upper part in the air washer (5) is also provided with an air washing spray header, and the water outlet at the bottom of the air washer (5) is connected with the air washing spray header through a secondary condensate circulating pump (4).
4. The energy-saving sludge drying device as set forth in claim 1, wherein: the top in the cooling water cavity is also provided with a cooling water spray head, the cooling water spray head is connected with a condensate pump (10), and the condensate pump (10) pumps the cooling water in the cooling water cavity into the cooling water spray head.
5. The energy-saving sludge drying device as set forth in claim 1, wherein: the cooling water cavity of the horizontal tube falling film evaporator (6) is also provided with a water replenishing port.
CN202020756876.XU 2020-05-09 2020-05-09 Energy-saving sludge drying device Active CN212451137U (en)

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Application Number Priority Date Filing Date Title
CN202020756876.XU CN212451137U (en) 2020-05-09 2020-05-09 Energy-saving sludge drying device

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Application Number Priority Date Filing Date Title
CN202020756876.XU CN212451137U (en) 2020-05-09 2020-05-09 Energy-saving sludge drying device

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Publication Number Publication Date
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113371975A (en) * 2021-07-21 2021-09-10 中洁蓝环保科技有限公司 Sludge heat drying system and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113371975A (en) * 2021-07-21 2021-09-10 中洁蓝环保科技有限公司 Sludge heat drying system and method

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Effective date of registration: 20211111

Address after: 214400 16-3, No. 988, Gangcheng Avenue, Shengang street, Jiangyin City, Wuxi City, Jiangsu Province

Patentee after: Wuxi Qingcheng Equipment Technology Co., Ltd

Address before: No. 48, Qiaoqi Park Road, XuXiake Town, Jiangyin City, Wuxi City, Jiangsu Province, 214400

Patentee before: Jiangsu tianniu Environmental Protection Technology Co., Ltd

TR01 Transfer of patent right