CN113137610A - Household garbage drying system and method - Google Patents
Household garbage drying system and method Download PDFInfo
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- CN113137610A CN113137610A CN202010050964.2A CN202010050964A CN113137610A CN 113137610 A CN113137610 A CN 113137610A CN 202010050964 A CN202010050964 A CN 202010050964A CN 113137610 A CN113137610 A CN 113137610A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/14—Chambers, containers, receptacles of simple construction
- F26B25/16—Chambers, containers, receptacles of simple construction mainly closed, e.g. drum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the technical field of household garbage treatment, and particularly discloses a household garbage drying system and a method. The garbage is directly contacted with hot air in the roller dryer, the hot air for drying the household garbage with high water content can be set to be higher temperature, the water evaporation is fast, the drying efficiency is high, the garbage drying treatment capacity is large, and the garbage drying treatment capacity can be used in an engineering mode.
Description
Technical Field
The invention belongs to the technical field of household garbage treatment, and particularly relates to a household garbage drying system and method.
Background
In recent years, the rapid development of the household garbage treatment industry promotes the improvement and development of the technologies of garbage incineration, garbage pyrolysis, garbage gasification and the like. The domestic garbage is also well pretreated, cured, crushed, screened, magnetically separated, winnowed and the like, and finally enters a garbage incinerator or a pyrolysis furnace. At the moment, the garbage contains a large amount of moisture, the moisture enters the incinerator or the pyrolysis furnace along with the garbage, and the excessive moisture in the garbage can absorb a large amount of heat, so that the yield of steam is reduced, and the generating capacity is reduced. The excess moisture produces a large amount of water vapor that is not recoverable and which is mixed with the flue gas, increasing gas handling costs.
If the water content in the garbage is reduced after the garbage is pretreated and is dried, the problems can be solved. At present, a drum dryer is generally used in the household garbage drying process, and the heat source for drying is hot air, smoke, steam or electric heating and the like.
Generally, when hot air or flue gas is used as a heat source in an engineering device, the hot air or flue gas directly exchanges heat with garbage in a drying process to generate a large amount of gas with odor. The discharged gas is generally discharged or enters a furnace for incineration after passing through a gas treatment device. The large amount of gas generated by the drying increases the scale of the gas processing apparatus, resulting in an increase in investment cost. A plurality of gases generated by drying enter the furnace to be burnt, so that the heat efficiency of the furnace is reduced or the corrosion in the furnace is caused; when the gas quantity is too large and even exceeds the combustion-supporting air quantity required by the furnace, the redundant gas also needs to be matched with a gas treatment device, and the redundant gas can be discharged after treatment.
If the domestic garbage is dried by indirect heating through steam or electric heating, a large amount of steam or electric energy is consumed although the amount of tail gas is reduced, and the drying efficiency is low.
Therefore, it is necessary to design a new household garbage drying system to solve the above problems.
Disclosure of Invention
The invention aims to provide a household garbage drying system and a household garbage drying method, which can reduce the discharge amount of tail gas and reduce the treatment cost of sewage.
The technical scheme of the invention is as follows:
a household garbage drying system comprises feeding equipment, a roller dryer, discharging equipment, a cyclone separator, a tail gas heat exchanger, a condenser, a circulating air valve, a circulating fan, a circulating air preheater, a flue gas air valve, a tail fan and a discharging valve;
the feeding device is provided with a garbage feeding hole for throwing garbage; the discharge hole of the feeding equipment is communicated with the feed inlet of the roller dryer; a spiral conveying blade is arranged in the feeding equipment and drives the feeding equipment to rotate so as to drive the garbage to move to the discharge hole;
the bottom of a discharge port of the roller dryer is communicated with a discharge device, and the top of the discharge port is communicated with the upper part of the cyclone separator through a pipeline A; a thermometer B is arranged on the pipeline A;
the bottom of the cyclone separator is connected with a discharge valve, and the top of the cyclone separator is connected with a circulating gas inlet of the tail gas heat exchanger through a pipeline B; a circulating gas outlet of the tail gas heat exchanger is connected with a circulating gas inlet of the condenser through a pipeline; a low-temperature circulating gas inlet of the tail gas heat exchanger is connected with an outlet of a circulating fan, and low-temperature circulating gas is introduced into the shell pass of the tail gas heat exchanger through the circulating fan; a low-temperature circulating gas outlet of the tail gas heat exchanger is connected with a circulating gas inlet of a circulating air preheater;
the condenser is provided with a cooling water inlet, a cooling water outlet and a condensed wastewater outlet, a circulating gas outlet of the condenser is connected with a circulating fan through a pipeline C, and the pipeline C is provided with a circulating air valve; a branch pipe A is led out from a circulating gas outlet of the condenser and is connected with a tail gas blower, and a tail gas valve is arranged on the branch pipe A;
the circulating air preheater is a shell-and-tube heat exchanger, circulating gas is arranged in a tube pass, high-temperature gas is arranged in a shell pass, and a high-temperature gas inlet and a high-temperature gas outlet are arranged on the high-temperature gas; the high-temperature gas inlet is communicated with a pipeline D through a branch pipe B, and a flue gas air valve is arranged on the branch pipe B; and a circulating gas outlet of the circulating air preheater is connected with an air inlet of the roller dryer through a pipeline D, and a pressure gauge, a thermometer A and a gas composition analyzer are arranged on the pipeline D.
The axis of the drum dryer and the horizontal plane form an included angle A, the included angle A is less than 10 degrees, and the garbage feeding end is higher than the discharging end, so that the discharging is facilitated.
And the outer side of the pipeline D is wrapped with an insulating layer.
The circulating gas is recycled in the system; the high-temperature gas is high-temperature flue gas, hot air or other gas or mixture with heat storage capacity.
A household garbage drying method is operated by adopting the drying system and comprises the following steps:
s1: domestic waste feed
The household garbage enters the feeding device from the garbage feeding hole and is driven by the spiral conveying blade to enter the drum dryer;
s2: drying domestic garbage
The rotary drum dryer rotates to drive the garbage in the rotary drum dryer to move, the garbage is lifted and slowly moves towards the discharge hole, and high-temperature gas blown from the air preheater enters from the air inlet of the rotary drum dryer and is mixed with the garbage to heat the garbage to evaporate water in the garbage;
the dried garbage enters discharging equipment through the bottom of a discharging port of the roller dryer;
the dried tail gas is reduced in temperature, increased in humidity and contains dust, and is discharged from the top of a discharge port of the roller dryer;
s3: tail gas dust removing and cooling device
The dried tail gas enters a cyclone separator, wherein the separated dust is discharged from a discharge valve, the gas is discharged from the top of the cyclone separator, enters a tail gas heat exchanger, exchanges heat with low-temperature circulating gas conveyed by a circulating fan, and part of heat in the tail gas is recovered;
s4: tail gas dehumidification
The cooled tail gas enters a condenser, further heat exchange and cooling are carried out through cooling water, wherein the cooling water enters from a cooling water inlet and is discharged from a cooling water outlet, and condensed water in the tail gas is discharged from a condensed wastewater outlet and then is treated;
s5: tail gas recovery cycle
The tail gas after further cooling is firstly pressurized by the circulating fan, then is heated into high-temperature gas after passing through the tail gas heat exchanger and the circulating air preheater, and enters the drum dryer to start a new drying process, so that gas circulation is realized.
In the whole process from S1 to S5, measuring the pressure in the system by a pressure gauge;
when the pressure exceeds the upper limit of the set range, the tail air valve is opened, and partial gas is discharged by the tail air fan to keep the pressure in the system stable; when the pressure is lower than the lower limit of the set range, a part of high-temperature flue gas is supplemented by opening the flue gas air valve, and the normal circulating pressure in the system is kept.
Measuring the components of each combustible gas in the circulating gas by a gas component analyzer in the whole process from S1 to S5;
when the content of the combustible gas reaches the explosive root limit, partial gas is discharged by using a tail fan by opening a tail gas valve, and meanwhile, the flue gas valve is opened to supplement partial high-temperature flue gas, so that the concentration of the combustible gas is reduced.
Measuring the temperature of the dry hot air through a thermometer A in the whole process of S1-S5;
when the temperature is high, reducing the flow or temperature of high-temperature flue gas entering a high-temperature gas inlet; when the temperature is low, the flow rate or the temperature of the high-temperature flue gas entering the high-temperature gas inlet is increased.
The pressure setting range is adjusted according to the working condition of the roller dryer and the water content of the dried material.
And for the household garbage with high water content, the temperature of the hot drying air is set to be 280-320 ℃, and the temperature is specifically adjusted according to the water content of the garbage and the water content at the end of drying.
The invention has the following remarkable effects:
(1) the gas in the drying system sequentially passes through the processes of the roller dryer, tail gas dedusting and cooling, tail gas dehumidification, tail gas recovery and circulation and the like, the gas is dehumidified and heated and then enters the roller dryer, only a small amount of tail gas is discharged in the whole drying process, the discharge amount of odorous gas can be obviously reduced, and the investment cost of gas treatment is reduced.
(2) According to the invention, moisture in the garbage enters the condenser along with the cooled tail gas in a steam form, and is further subjected to heat exchange and cooling through cooling water, wherein the cooling water enters from the cooling water inlet and is discharged from the cooling water outlet, and condensed water in the tail gas is discharged from the condensed wastewater outlet and then is treated; the condensed water contains less pollutants, the water treatment process is simplified, and the treatment cost is reduced compared with the waste leachate treatment.
(3) The invention improves the heat value of the dried garbage, and is beneficial to the smooth proceeding of the subsequent incineration or pyrolysis treatment process.
(4) The garbage is directly contacted with hot air in the roller dryer, the hot air for drying the household garbage with high water content can be set to be at a higher temperature, such as 280-320 ℃, the water evaporation is fast, the drying efficiency is high, the garbage drying treatment capacity is large, and the garbage drying treatment capacity can be used in an engineering mode.
(5) The drying system of the present invention uses a circulating gas as a carrier gas, and a gas component analyzer and a thermometer are provided on a pipeline. In the garbage drying process, the component concentration of each combustible gas in the gas is measured through a gas component analyzer, and the concentration of the combustible gas in the gas is adjusted through a flue gas air valve; measuring the temperature of the drying hot air through a thermometer, adjusting the flow of high-temperature flue gas through an air valve, and controlling the temperature inside the dryer; thereby ensuring the safe operation of the drying process.
Drawings
FIG. 1 is a schematic view of a drying system according to the present invention.
In the figure: 1 feeding equipment; 2, a roller dryer; 3, discharging equipment; 4, a cyclone separator; 5 tail gas heat exchanger; 6, a condenser; 7 circulating air valve; 8, a circulating fan; 9 circulating air preheater; 10 flue gas blast gate; 11 a tail gas valve; 12 tail fans; 13 a discharge valve; 1A, a garbage feeding hole; 5A, a circulating gas inlet; 5B, a circulating gas outlet; a 5C low-temperature circulating gas inlet; a 5D low-temperature circulating gas outlet; 6A cooling water inlet; 6B a cooling water outlet; a 6C recycle gas inlet; a 6D recycle gas outlet; 6E a condensed wastewater outlet; 9A high-temperature gas inlet; 9B high-temperature gas outlet; a 9C recycle gas inlet; a 9D recycle gas outlet; 101 pressure gauge; 102 thermometer A; 103 gas composition analyzer; 104 thermometer B.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Fig. 1 shows a household garbage drying system, which comprises a feeding device 1, a drum dryer 2, a discharging device 3, a cyclone separator 4, a tail gas heat exchanger 5, a condenser 6, a circulating air valve 7, a circulating fan 8, a circulating air preheater 9, a flue gas air valve 10, a tail air valve 11, a tail air fan 12 and a discharging valve 13.
The feeding device 1 is provided with a garbage feeding port 1A for feeding garbage. And a discharge hole of the feeding equipment 1 is communicated with a feed inlet of the roller dryer 2. The feeding device 1 is internally provided with a spiral conveying blade which is driven to rotate to drive the garbage to move to the discharge hole.
The axis of the drum dryer 2 forms an included angle A with the horizontal plane, A is less than 10 degrees, and the garbage feeding end is higher than the discharging end so as to facilitate discharging. The bottom of the discharge port of the roller dryer 2 is communicated with a discharge device 3, and the top of the discharge port is communicated with the upper part of a cyclone separator 4 through a pipeline A. And a thermometer B104 is arranged on the pipeline A and is used for measuring the temperature of the dried circulating gas, feeding back to the control system and adjusting the flow rate of the circulating gas.
The bottom of the cyclone separator 4 is connected with a discharge valve 13, and the top of the cyclone separator 4 is connected with a circulating gas inlet 5A of a tail gas heat exchanger 5 through a pipeline B. And a circulating gas outlet 5B of the tail gas heat exchanger 5 is connected with a circulating gas inlet 6C of the condenser 6 through a pipeline. And a low-temperature circulating gas inlet 5C of the tail gas heat exchanger 5 is connected with an outlet of the circulating fan 8, and low-temperature circulating gas is introduced into the shell pass of the tail gas heat exchanger 5 through the circulating fan 8. And a low-temperature circulating gas outlet 5D of the tail gas heat exchanger 5 is connected with a circulating gas inlet 9C of a circulating air preheater 9.
The condenser 6 is provided with a cooling water inlet 6A, a cooling water outlet 6B and a condensed wastewater outlet 6E, a circulating gas outlet 6D of the condenser 6 is connected with a circulating fan 8 through a pipeline C, and the pipeline C is provided with a circulating air valve 7. A branch pipe A is led out from a circulating gas outlet 6D of the condenser 6 and is connected with a tail air fan 12, and a tail air valve 11 is arranged on the branch pipe A.
The circulating air preheater 9 is a shell-and-tube heat exchanger, circulating gas is arranged in a tube pass, high-temperature gas is arranged in a shell pass, and a high-temperature gas inlet 9A and a high-temperature gas outlet 9B are arranged on the circulating air preheater. And a circulating gas outlet 9D of the circulating air preheater 9 is connected with an air inlet of the roller dryer 2 through a pipeline D, a pressure gauge 101, a thermometer A102 and a gas component analyzer 103 are arranged on the pipeline D, and a heat-insulating layer is wrapped on the outer side of the pipeline D. The high-temperature gas inlet 9A is communicated with the pipeline D through a branch pipe B, and a flue gas air valve 10 is arranged on the branch pipe B.
The circulating gas is recycled in the system, and the high-temperature gas is high-temperature flue gas, hot air or other gas or mixture with heat storage capacity.
A household garbage drying method is operated by adopting the drying system and comprises the following steps:
s1: domestic waste feed
The household garbage enters the feeding device 1 from the garbage feeding port 1A and enters the drum dryer 2 through being driven by the spiral conveying blade.
S2: drying domestic garbage
The drum dryer 2 rotates to drive the garbage in the drum dryer to move, the garbage is lifted and slowly moves towards a discharge hole, and at the moment, high-temperature gas blown from the air preheater 9 enters from an air inlet of the drum dryer 2 and is mixed with the garbage to heat the garbage to evaporate water in the garbage;
the dried garbage enters a discharging device 3 through the bottom of a discharging port of the roller dryer 2;
the dried tail gas is low in temperature, high in humidity and dust-containing, and is discharged from the top of a discharge port of the drum dryer 2.
S3: tail gas dust removing and cooling device
And the dried tail gas enters the cyclone separator 4, wherein the separated dust is discharged from the discharge valve 13, the gas is discharged from the top of the cyclone separator 4, enters the tail gas heat exchanger 5, exchanges heat with the low-temperature circulating gas conveyed by the circulating fan 8, and part of heat in the tail gas is recovered.
S4: tail gas dehumidification
The tail gas after cooling enters the condenser 6, further heat exchange and cooling are carried out through cooling water, wherein the cooling water enters from the cooling water inlet 6A and is discharged from the cooling water outlet 6B, and condensed water in the tail gas is discharged from the condensed water outlet 6E and then goes to water treatment.
S5: tail gas recovery cycle
The tail gas after further cooling is firstly pressurized by the circulating fan 8, then is heated into high-temperature gas after passing through the tail gas heat exchanger 5 and the circulating air preheater 9, and enters the drum dryer 2 to start a new drying process, so that gas circulation is realized.
In the whole process from S1 to S5, the pressure in the system is measured by a pressure gauge 101, and when the pressure exceeds the upper limit of the set range, the pressure in the system is kept stable by opening a tail gas valve 11 and discharging part of gas by a tail gas fan 12; when the pressure is lower than the lower limit of the set range, a part of high-temperature flue gas is supplemented by opening the flue gas air valve 10, and the normal circulating pressure in the system is kept. The pressure setting range is generally about 0, and is properly adjusted according to the working condition of the roller dryer 2 and the water content of the dried material. Measuring the temperature of the drying hot air through a thermometer A102, and reducing the flow or temperature of the high-temperature flue gas entering the high-temperature gas inlet 9A when the temperature is high; when the temperature is low, the flow rate or temperature of the high-temperature flue gas entering the high-temperature gas inlet 9A is increased. For domestic garbage with high water content, the temperature of the hot drying air is generally set to be about 300 ℃, and the temperature is adjusted according to the water content of the garbage and the water content at the end of drying. The gas component analyzer 103 is used for measuring the components of combustible gas such as oxygen, methane and the like in the circulating gas, and when the content of the combustible gas reaches the explosive root limit, the tail air valve 11 is opened, partial gas is discharged by the tail air fan 12, and the flue gas air valve 10 is opened simultaneously, so that part of high-temperature flue gas is supplemented, and the concentration of the combustible gas is reduced.
Claims (10)
1. The utility model provides a domestic waste drying system which characterized in that: the device comprises a feeding device (1), a roller dryer (2), a discharging device (3), a cyclone separator (4), a tail gas heat exchanger (5), a condenser (6), a circulating air valve (7), a circulating fan (8), a circulating air preheater (9), a flue gas air valve (10), a tail air valve (11), a tail air fan (12) and a discharging valve (13);
the feeding device (1) is provided with a garbage feeding hole (1A) for throwing garbage; the discharge hole of the feeding device (1) is communicated with the feed hole of the roller dryer (2); a spiral conveying blade is arranged in the feeding equipment (1) and drives the feeding equipment to rotate so as to drive the garbage to move to the discharge hole;
the bottom of a discharge port of the roller dryer (2) is communicated with a discharge device (3), and the top of the discharge port is communicated with the upper part of the cyclone separator (4) through a pipeline A; a thermometer B (104) is arranged on the pipeline A;
the bottom of the cyclone separator (4) is connected with a discharge valve (13), and the top of the cyclone separator (4) is connected with a circulating gas inlet (5A) of the tail gas heat exchanger (5) through a pipeline B; a circulating gas outlet (5B) of the tail gas heat exchanger (5) is connected with a circulating gas inlet (6C) of the condenser (6) through a pipeline; a low-temperature circulating gas inlet (5C) of the tail gas heat exchanger (5) is connected with an outlet of a circulating fan (8), and low-temperature circulating gas is introduced into the shell pass of the tail gas heat exchanger (5) through the circulating fan (8); a low-temperature circulating gas outlet (5D) of the tail gas heat exchanger (5) is connected with a circulating gas inlet (9C) of a circulating air preheater (9);
a cooling water inlet (6A), a cooling water outlet (6B) and a condensed wastewater outlet (6E) are arranged on the condenser (6), a circulating gas outlet (6D) of the condenser (6) is connected with a circulating fan (8) through a pipeline C, and a circulating air valve (7) is arranged on the pipeline C; a branch pipe A is led out from a circulating gas outlet (6D) of the condenser (6) and connected with a tail air blower (12), and a tail air valve (11) is arranged on the branch pipe A;
the circulating air preheater (9) is a shell-and-tube heat exchanger, circulating gas is arranged in a tube pass, high-temperature gas is arranged in a shell pass, and a high-temperature gas inlet (9A) and a high-temperature gas outlet (9B) are arranged on the circulating air preheater; the high-temperature gas inlet (9A) is communicated with the pipeline D through a branch pipe B, and a flue gas air valve (10) is arranged on the branch pipe B; and a circulating gas outlet (9D) of the circulating air preheater (9) is connected with an air inlet of the roller dryer (2) through a pipeline D, and a pressure gauge (101), a thermometer A (102) and a gas component analyzer (103) are arranged on the pipeline D.
2. The domestic waste drying system of claim 1, wherein: the axis of the drum dryer (2) and the horizontal plane form an included angle A, A is less than 10 degrees, and the garbage feeding end is higher than the discharging end to facilitate discharging.
3. The domestic waste drying system of claim 1, wherein: and the outer side of the pipeline D is wrapped with an insulating layer.
4. The domestic waste drying system of claim 1, wherein: the circulating gas is recycled in the system; the high-temperature gas is high-temperature flue gas, hot air or other gas or mixture with heat storage capacity.
5. A household waste drying method operating with the drying system of claim 4, characterized in that: the method comprises the following steps:
s1: domestic waste feed
The household garbage enters the feeding equipment (1) from the garbage feeding hole (1A) and is driven by the spiral conveying blade to enter the drum dryer (2);
s2: drying domestic garbage
The rotary drum dryer (2) rotates to drive the garbage in the rotary drum dryer to move, the garbage is lifted and slowly moves towards the discharge hole, and at the moment, high-temperature gas blown from the air preheater (9) enters from the air inlet of the rotary drum dryer (2) and is mixed with the garbage to heat the garbage to evaporate water in the garbage;
the dried garbage enters a discharging device (3) through the bottom of a discharging port of the roller dryer (2);
the dried tail gas is reduced in temperature, increased in humidity and contains dust, and is discharged from the top of a discharge hole of the roller dryer (2);
s3: tail gas dust removing and cooling device
The dried tail gas enters a cyclone separator (4), wherein the separated dust is discharged from a discharge valve (13), the gas is discharged from the top of the cyclone separator (4), enters a tail gas heat exchanger (5), exchanges heat with low-temperature circulating gas conveyed by a circulating fan (8), and part of heat in the tail gas is recovered;
s4: tail gas dehumidification
The tail gas after temperature reduction enters a condenser (6), further heat exchange and temperature reduction are carried out through cooling water, wherein the cooling water enters from a cooling water inlet (6A) and is discharged from a cooling water outlet (6B), and condensed water in the tail gas is discharged from a condensed wastewater outlet (6E) and then is treated;
s5: tail gas recovery cycle
The tail gas after further cooling is firstly pressurized by a circulating fan (8), then is heated into high-temperature gas after passing through a tail gas heat exchanger (5) and a circulating air preheater (9), and enters a drum dryer (2) to start a new drying process, so that gas circulation is realized.
6. The domestic waste drying method of claim 5, wherein: in the whole process from S1 to S5, the pressure in the system is measured by a pressure gauge (101);
when the pressure exceeds the upper limit of the set range, the pressure in the system is kept stable by opening the tail air valve (11) and discharging part of gas by using the tail air fan (12); when the pressure is lower than the lower limit of the set range, a part of high-temperature flue gas is supplemented by opening the flue gas air valve (10), and the normal circulating pressure in the system is kept.
7. The domestic waste drying method of claim 6, wherein: measuring the composition of each combustible gas in the circulating gas by a gas composition analyzer (103) throughout the process from S1 to S5;
when the content of the combustible gas reaches the explosive root limit, partial gas is discharged by using a tail fan (12) by opening a tail air valve (11), and meanwhile, a flue gas air valve (10) is opened to supplement partial high-temperature flue gas, so that the concentration of the combustible gas is reduced.
8. A method for drying household garbage according to claim 7, characterized in that: measuring the temperature of the dry hot wind by a thermometer A (102) throughout the process of S1-S5;
when the temperature is high, the flow or the temperature of high-temperature flue gas entering a high-temperature gas inlet (9A) is reduced; when the temperature is low, the flow rate or the temperature of the high-temperature flue gas entering the high-temperature gas inlet (9A) is increased.
9. A method for drying household garbage according to claim 8, characterized in that: the pressure setting range is adjusted according to the working condition of the roller dryer (2) and the water content of the dried material.
10. A domestic waste drying method according to claim 9, wherein: and for the household garbage with high water content, the temperature of the hot drying air is set to be 280-320 ℃, and the temperature is specifically adjusted according to the water content of the garbage and the water content at the end of drying.
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| CN202010050964.2A CN113137610A (en) | 2020-01-17 | 2020-01-17 | Household garbage drying system and method |
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| CN202010050964.2A CN113137610A (en) | 2020-01-17 | 2020-01-17 | Household garbage drying system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114674140A (en) * | 2022-04-07 | 2022-06-28 | 上海格洛瑞环保科技有限公司 | Material drying waste gas cyclic heating utilization method and system |
| WO2023044843A1 (en) * | 2021-09-23 | 2023-03-30 | 湖北富邦科技股份有限公司 | Efficient and rapid drying machine for granulated fertilizer and drying method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114674140A (en) * | 2022-04-07 | 2022-06-28 | 上海格洛瑞环保科技有限公司 | Material drying waste gas cyclic heating utilization method and system |
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