CN114984702A - Method and equipment for zero discharge of waste steam washing and sewage of tube bundle dryer - Google Patents
Method and equipment for zero discharge of waste steam washing and sewage of tube bundle dryer Download PDFInfo
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- CN114984702A CN114984702A CN202210803329.6A CN202210803329A CN114984702A CN 114984702 A CN114984702 A CN 114984702A CN 202210803329 A CN202210803329 A CN 202210803329A CN 114984702 A CN114984702 A CN 114984702A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/001—Filters in combination with devices for the removal of gas, air purge systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2247/00—Details relating to the separation of dispersed particles from gases, air or vapours by liquid as separating agent
- B01D2247/04—Regenerating the washing fluid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the field of waste steam and sewage treatment, in particular to a method and equipment for zero discharge of waste steam and waste water of a tube bundle dryer, wherein a waste steam outlet of the tube bundle dryer is communicated with a waste steam inlet of a steam washing tower; a clean steam outlet at the upper end of the steam washing tower is communicated with an exhaust device; a water inlet of the steam washing water circulating pump extends into the position below the water surface in the steam washing tower through a water pipe, and a water outlet pipe of the steam washing water circulating pump is communicated with a spray header in the steam washing tower through a pipeline; the water inlet of the concentrated water pump is communicated with the bottom of the steam washing tower, and the communication of the concentrated water pump and the steam washing tower is positioned below the water surface of the steam washing tower; the water outlet of the concentrated water pump, the water inlet of the filter press, the purified water outlet of the filter press, the water inlet of the purified water pump, the water outlet of the purified water pump and the water inlet of the water purifying device are communicated in sequence; the water outlet of the water purifying device is communicated with the water inlet of the steam washing water circulating pump; the effect of zero discharge of sewage and polluted gas is realized; in addition, the material in the waste steam is recovered.
Description
Technical Field
The invention relates to the field of waste steam and sewage treatment, in particular to a method and equipment for zero discharge of waste steam and sewage in a tube bundle dryer.
Background
The corn is produced into starch, sugar, fuel ethanol, monosodium glutamate, corn oil, feed fiber, protein powder, etc. by a wet milling method. In the production process, the water content of the product fiber, germ and albumen powder is reduced from 50-60% to about 12% according with the national standard by using a tube bundle dryer. The water in the material is heated to be water vapor, and the water vapor carries more material dust (commonly called waste vapor); the waste steam is discharged from the tube bundle dryer, which causes great dust pollution to the environment. To eliminate dust pollution, waste steam is washed with water. The concentrated water (water and material suspended matters) of the waste steam contains a large amount of material suspended matters.
In the prior art, concentrated water enters a sewage treatment facility for biochemical treatment, and COD is reduced to meet the national discharge standard and then is discharged. But even if the standard is reached, 7.5 percent of COD sewage is discharged; in addition, in the biochemical treatment process, methane and other peculiar smell gases are generated and discharged into the atmosphere, so that the atmosphere is polluted. This is the source of the unpleasant odor in the vicinity of all sewage treatment facilities. Due to different production scales, one plant needs to treat and discharge one hundred thousand to million tons of sewage every year, waste water resources, increase production cost and cause water pollution and air pollution to a certain degree.
The prior art has the following disadvantages: pollutant gases (methane and other off-flavor gases) are generated and discharged in the biochemical treatment stage, consuming a large amount of water resources.
Disclosure of Invention
Aiming at generating and discharging polluting gases (methane and other peculiar smell gases) in the biochemical treatment stage in the prior art, a large amount of water resources are consumed. The invention provides a method and equipment for zero discharge of waste steam washing and sewage of a tube bundle dryer, which realize the effect of zero discharge of sewage and polluted gas; in addition, the material in the waste steam is recovered.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
a pipe bundle dryer waste steam-washing sewage zero-emission device is characterized by comprising a pipe bundle dryer 1, a steam-washing tower 2, a water level sensing device 3, a steam-washing water circulating pump 4, an exhaust device 6, a concentrated water pump 7, a filter press 8, a water purification pump 9 and a water purification device 10;
the waste steam outlet 01 of the tube bundle dryer 1 is communicated with the waste steam inlet 21 of the steam washing tower 2; a clean steam outlet 22 at the upper end of the steam washing tower 2 is communicated with the exhaust equipment 6; a water inlet of the steam washing water circulating pump 4 extends below the water surface in the steam washing tower 2 through a water pipe, and a water outlet pipe of the steam washing water circulating pump 4 is communicated with a spray header in the steam washing tower 2 through a pipeline;
a water inlet of the concentrated water pump 7 is communicated with the bottom of the steam washing tower 2, and the communication of the concentrated water pump and the steam washing tower is positioned below the water surface of the steam washing tower 2; a water outlet of the concentrated water pump 7, a water inlet of the filter press 8, a purified water outlet of the filter press 8, a water inlet of the purified water pump 9, a water outlet of the purified water pump 9 and a water inlet of the water purifying device 10 are communicated in sequence; the water outlet of the water purifying device 10 is communicated with the water inlet of the steam washing water circulating pump 4.
Further, the exhaust equipment 6 is a chimney or a device for purifying steam.
Further, the fresh water pump 11 is also included,
the water inlet of the new water pump 11 is communicated with a water source, and the water outlet of the new water pump 11 is communicated with the gas washing tower 2.
Further, the fan 5 is installed on the pipeline between the tube bundle dryer 1 and the steam washing tower 2; or the fan 5 is arranged on a pipeline between the steam washing tower 2 and the exhaust equipment 6;
the fan 5 always conveys the gas from the tube bundle dryer 1 to the exhaust gas system 6.
Further, the water level sensing device 3 includes two water level sensors, wherein the two water level sensors with different heights are used for detecting the water level inside the scrubbing tower 2;
the water level sensing device 3, the new water pump 11 and the control electric cabinet 12 are electrically connected.
Further, the steam-washing water circulating pump 4, the fan 5, the concentrated water pump 7, the purified water pump 9 and the fresh water pump 11 are all electrically connected with the control electric cabinet.
Furthermore, local switches are arranged on cables which are respectively connected with the control electric cabinet on the fan 5, the washing steam-water circulating pump 4, the concentrated water pump 7, the water purifying pump 9 and the fresh water pump 11.
Further, when the content of suspended matters in the circulating water reaches 10 percent in S1, starting a concentrated water pump 7 to discharge the gas washing tower;
s2, pressurizing the concentrated water by a concentrated water pump 7, and directly feeding the pressurized concentrated water into a filter press 8; biochemical treatment is not needed;
s3, taking out the separated suspended matters by the filter press 8, and putting the suspended matters into the tube bundle dryer 1 for secondary drying to obtain finished products;
s4, the water separated by the filter press 8 enters the steam washing tower 2 again to become washing circulating water; or the water separated by the filter press 8 does not enter the steam washing tower 2, but enters the existing corn crusher, the soaking tank and the separator;
further, in the process of S1 to S4 at S5, the steam scrubber 2 is supplemented with fresh water as necessary to keep the water level in the steam scrubber 2 within the normal range.
Further, S6, in the whole operation process of the equipment, the control electric cabinet 12 or the local switch is used for automatically or manually controlling the circulating pump 4, the fan 5, the concentrated water pump 7, the purified water pump 9 and the fresh water pump 11.
The beneficial effects of the invention are as follows:
1. because the steam washing tower 2 cleans impurities in the waste gas and obtains clean gas, the gas is discharged through the exhaust equipment 6, and zero emission of polluted gas is achieved. In addition, when the water in the steam washing tower 2 is used for a long time, impurities in the water become more (namely, the water is concentrated water), the concentrated water is sequentially treated by a concentrated water pump 7, a filter press 8, a clear water pump 9 and a water purifying device 10 to obtain clean water, the clean water is sent to a steam washing water circulating pump 4 from the water purifying device 10, namely the concentrated water is treated into the clear water and then is recycled, and zero sewage discharge is achieved; in summary, the effect of zero discharge of sewage and polluted gas is realized.
2. The circulation rate of the steam-washing circulating water is 80 percent.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of the present application;
FIG. 2 is a schematic structural diagram of a second embodiment of the present invention;
reference symbol comparison table:
the system comprises a tube bundle dryer 1, a waste steam outlet 01, a steam washing tower 2, a water level sensing device 3, a steam washing water circulating pump (essentially a water pump) 4, a fan 5, an exhaust device 6, a concentrated water pump 7, a filter press 8, a dried matter outlet 82, a water purifying pump 9, a water purifying device 10, a fresh water pump 11, a control electric cabinet 12 and an on-site switch 131/132/133/134/135.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
In order to make the content of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Firstly, roughly explaining the steam washing tower 2 in the prior art, the bottom of the steam washing tower 2 is filled with water, and a spray header is arranged at an upper position inside the steam washing tower 2. In the drawings, the arrows indicate the direction of water flow or air flow. In addition, the first and second solutions are different only in the arrangement position of the fan 5.
Referring to fig. 1 and 2, a pipe bundle dryer waste steam-washing sewage zero-emission device comprises a pipe bundle dryer 1, a steam-washing tower 2, a water level sensing device 3, a steam-washing water circulating pump 4, an exhaust device 6, a concentrated water pump 7, a filter press 8, a purified water pump 9 and a water purifying device 10;
[ EXHAUST GAS TREATMENT SYSTEM ] the waste steam outlet 01 of the tube bundle dryer 1 is communicated with the waste steam inlet 21 of the steam scrubber 2 (through a pipeline); a clean steam outlet 22 at the upper end of the steam washing tower 2 is communicated with the exhaust equipment 6 (through a pipeline); specifically, the exhaust equipment 6 is a chimney or a device for purifying steam; a water inlet of the steam washing water circulating pump 4 extends below the water surface in the steam washing tower 2 through a water pipe, a water outlet pipe of the steam washing water circulating pump 4 is communicated with a spray header in the steam washing tower 2 through a pipeline, namely the steam washing water circulating pump 4 is used for pumping water in the steam washing tower 2 to the spray header, and water sprayed from the spray header can sink dust in waste gas into the water; the gas cleaned in the steam scrubber 2 enters the exhaust device 6, and the exhaust device 6 exhausts the gas.
[ CONCENTRATE WATER TREATMENT ] A water inlet (through a water pipe) of a CONCENTRATE water pump 7 is communicated with the bottom of a steam scrubber 2, and the communication of the two is positioned below the water surface of the steam scrubber 2; the water outlet of the concentrated water pump 7, the water inlet of the filter press 8, the purified water outlet of the filter press 8, the water inlet of the purified water pump 9 (which is essentially a water pump), the water outlet of the purified water pump 9 and the water inlet of the water purifying device 10 are communicated in sequence (through a water pipe). The water outlet of the water purifying device 10 is communicated with the water inlet of the steam washing water circulating pump 4. Wherein, suspended matters in the concentrated water are extruded into dry matters in the filter press 8, the cover of the filter press 8 is opened, and the dry matters are taken out from the dry matter outlet 82 and sent to the pipe bundle dryer 1 for secondary drying to be finished products, thus realizing waste recovery.
In conclusion, because the steam washing tower 2 washes impurities in the waste gas and obtains clean gas, the gas is discharged through the exhaust device 6, and zero emission of polluted gas is achieved. In addition, when the water in the steam washing tower 2 is used for a long time, impurities in the water become more (namely, the water is concentrated water), the concentrated water is sequentially treated by a concentrated water pump 7, a filter press 8, a clear water pump 9 and a water purifying device 10 to obtain clean water, the clean water is sent to a steam washing water circulating pump 4 from the water purifying device 10, namely the concentrated water is treated into the clear water and then is recycled, and zero sewage discharge is achieved; in summary, the effect of zero discharge of sewage and polluted gas is realized.
Further, since the water in the scrubber tower 2 is circulated during the practical use, the water is gradually reduced due to the evaporation of the water and the like.
Also comprises a fresh water pump 11 which is provided with a fresh water pump,
and a water inlet of the fresh water pump 11 is communicated with a water source, and a water outlet of the fresh water pump 11 is communicated with the gas washing tower 2. The fresh water pump 11 is used to supply fresh water to the scrubber 2.
Further, a fan 5 is installed on a pipeline between the tube bundle dryer 1 and the steam washing tower 2; or the fan 5 is arranged on a pipeline between the steam washing tower 2 and the exhaust equipment 6;
the fan 5 always conveys the gas from the tube bundle dryer 1 to the exhaust gas system 6.
Further, the water level sensing device 3 includes two water level sensors, wherein the two water level sensors with different heights are used for detecting the water level inside the scrubbing tower 2 (that is, the water level sensing device 3 has a high water level detection point and a low water level detection point); that is, the detection parts of the two water level sensors are positioned in the detection scrubber tower 2.
The water level sensing device 3, the new water pump 11 and the control electric cabinet 12 are electrically connected.
When the water level sensing device 3 detects that the water level is lower than the low water level monitoring point, the control electric cabinet 12 starts the new water pump 11 to supply water to the gas washing tower. When the water level sensing device 3 detects that the water level reaches the high water level detection point, the control electric cabinet 12 cuts off the power of the new water pump 11.
Further, wash soda circulating pump 4, fan 5, dense water pump 7, clean water pump 9 all with control electric cabinet electric connection, can control opening of washing soda circulating pump 4, fan 5, dense water pump 7, clean water pump 9 through the control electric cabinet and stop.
Furthermore, in addition, local switches (131/132/133/134/135) can be installed on cables respectively connected with the control electric cabinet by the fan 5, the washing water circulating pump 4, the concentrated water pump 7, the purified water pump 9 and the fresh water pump 11. The on-site start and stop control of the fan 5, the washing steam-water circulating pump 4, the concentrated water pump 7, the water purifying pump 9 and the fresh water pump 11 is realized.
A method for zero discharge of waste steam washing sewage of a tube bundle dryer comprises the following steps:
s1, when the content of suspended matters in the circulating water reaches 10%, starting a concentrated water pump 7 to discharge the gas washing tower;
s2, pressurizing the concentrated water by a concentrated water pump 7, and directly feeding the pressurized concentrated water into a filter press 8; biochemical treatment is not needed;
s3, taking out the separated suspended matters by the filter press 8, and putting the suspended matters into the tube bundle dryer 1 for secondary drying to obtain finished products;
s4, the water separated by the filter press 8 enters the steam washing tower 2 again to become the circulating water of the washing gas. Alternatively, the water separated by the filter press 8 is not fed into the steam washing tower 2, but is fed into the existing corn crusher, steeping tank, separator (not shown).
Further, in the process of S1 to S4 at S5, the steam scrubber 2 is supplemented with fresh water as necessary to keep the water level in the steam scrubber 2 within the normal range.
Further, S6, in the whole operation process of the equipment, the control electric cabinet 12 or the local switch is used for automatically or manually controlling the circulating pump 4, the fan 5, the concentrated water pump 7, the purified water pump 9 and the fresh water pump 11.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A pipe bundle dryer waste steam-washing sewage zero-emission device is characterized by comprising a pipe bundle dryer, a steam-washing tower, a water level sensing device, a steam-washing water circulating pump, a steam-discharging device, a concentrated water pump, a pressure filter, a water purifying pump and a water purifying device;
the waste steam outlet of the tube bundle dryer is communicated with the waste steam inlet of the steam washing tower; a clean steam outlet at the upper end of the steam washing tower is communicated with steam exhaust equipment; a water inlet of the steam washing water circulating pump extends into the position below the water surface in the steam washing tower through a water pipe, and a water outlet pipe of the steam washing water circulating pump is communicated with a spray header in the steam washing tower through a pipeline;
the water inlet of the concentrated water pump is communicated with the bottom of the steam washing tower, and the communication of the concentrated water pump and the steam washing tower is positioned below the water surface of the steam washing tower; the water outlet of the concentrated water pump, the water inlet of the filter press, the purified water outlet of the filter press, the water inlet of the purified water pump, the water outlet of the purified water pump and the water inlet of the water purifying device are communicated in sequence; the water outlet of the water purifying device is communicated with the water inlet of the steam washing water circulating pump.
2. The waste steam and steam washing and sewage zero discharge equipment of the tube bundle dryer according to claim 1,
the steam exhaust equipment is a chimney or equipment using clean steam.
3. The pipe bundle dryer waste steam-washing sewage zero discharge equipment according to claim 1 or 2,
also comprises a new water pump which is arranged on the water tank,
and a water inlet of the fresh water pump is communicated with a water source, and a water outlet of the fresh water pump is communicated with the gas washing tower.
4. The waste steam and steam washing and sewage zero discharge equipment of the tube bundle dryer according to claim 1,
the fan is arranged on a pipeline between the tube bundle dryer and the steam washing tower; or the fan is arranged on a pipeline between the steam washing tower and the steam exhaust equipment;
and the fan conveys the waste steam to the steam exhaust equipment from the pipe bundle dryer all the time.
5. The waste steam and steam washing and sewage zero discharge equipment of the tube bundle dryer according to claim 1,
the water level sensing device is used for detecting the water level inside the scrubbing tower;
the water level sensing device, the fresh water pump and the control electric cabinet are electrically connected.
6. The device for zero discharge of waste steam and sewage in tube bundle dryer according to claim 5,
the washing water circulating pump, the fan, the concentrated water pump, the purified water pump and the fresh water pump are all electrically connected with the control electric cabinet.
7. The waste steam and steam washing and sewage zero discharge equipment of the tube bundle dryer according to claim 1,
and local switches are arranged on cables respectively connected with the control electric cabinet on the fan, the washing water circulating pump, the concentrated water pump, the purified water pump and the fresh water pump, and the local switches are electrically connected with the control electric cabinet. The PLC control electric cabinet is one of an intelligent meter, a knob, a key type and a computer screen type.
8. The method for zero discharge of waste steam washing and sewage of the tube bundle dryer is characterized by comprising the following steps of:
s1, when the content of suspended matters in the circulating water reaches the set content, starting a concentrated water pump to discharge the gas washing tower;
s2, pressurizing the concentrated water by a concentrated water pump, and directly feeding the pressurized concentrated water into a filter press; biochemical treatment is not needed;
s3, putting the suspended matters separated by the filter press into a tube bundle dryer 1 for secondary drying to obtain a finished product;
s4, the water separated by the filter press enters the steam washing tower again to become washing circulating water; or the water separated by the filter press is used as process water and enters the existing corn crusher, soaking tank and separator.
9. The method for zero discharge of waste steam and steam-washing sewage of the tube bundle dryer according to claim 8,
and S5, supplementing necessary fresh water to the steam washing tower in the process of S1-S4, and keeping the water level in the steam washing tower within a normal range.
10. The method for zero discharge of waste steam-washing sewage of a tube bundle dryer according to claim 8 or 9,
and S6, in the whole equipment operation process, the control electric cabinet or the local switch is used for automatically or manually controlling the circulating pump, the fan, the concentrated water pump, the purified water pump and the fresh water pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210803329.6A CN114984702A (en) | 2022-07-07 | 2022-07-07 | Method and equipment for zero discharge of waste steam washing and sewage of tube bundle dryer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210803329.6A CN114984702A (en) | 2022-07-07 | 2022-07-07 | Method and equipment for zero discharge of waste steam washing and sewage of tube bundle dryer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114984702A true CN114984702A (en) | 2022-09-02 |
Family
ID=83020629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210803329.6A Withdrawn CN114984702A (en) | 2022-07-07 | 2022-07-07 | Method and equipment for zero discharge of waste steam washing and sewage of tube bundle dryer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114984702A (en) |
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2022
- 2022-07-07 CN CN202210803329.6A patent/CN114984702A/en not_active Withdrawn
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Application publication date: 20220902 |
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| WW01 | Invention patent application withdrawn after publication |