CN212430876U - System for utilize high temperature flue gas recirculation to handle high moisture content domestic waste - Google Patents
System for utilize high temperature flue gas recirculation to handle high moisture content domestic waste Download PDFInfo
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Abstract
The utility model discloses a system for recycling high-temperature flue gas to treat high-moisture-content household garbage, which comprises a combustion furnace, a flue gas extraction device, a flue gas purification device, a garbage drying device and a gas distribution device; a two-stage economizer is arranged in a tail flue of the combustion furnace; the smoke extraction device comprises a smoke extraction port, a circulating fan and a smoke pipeline; the smoke extraction port is positioned in the middle of the two-stage coal economizer; the garbage drying device comprises a horizontal flue gas air chamber and a vertical drying air chamber, and a flue gas pipeline is respectively communicated with the horizontal flue gas air chamber and the vertical drying air chamber through control valves; the gas distribution device comprises a horizontal flue gas air chamber gas distribution device and a vertical drying air chamber flue gas distribution device. The utility model discloses processing system for dry high moisture content is gone into stove rubbish to improve and burn section rubbish calorific value, improve the combustion situation, improve furnace temperature and burn-off rate, go into the stove to burn to high moisture content rubbish, northern cold district and rainy area rubbish and have the significance.
Description
Technical Field
The utility model relates to an utilize high temperature flue gas recirculation to handle high moisture content domestic waste system belongs to the dry incineration disposal technical field of rubbish.
Background
Due to unique dietary habits and waste recovery modes in China, the heat value of the garbage burnt in the incinerator is low, most of the garbage entering the incinerator is kitchen waste and other low-heat-value wastes, the water content is sometimes high, and the heat value of the garbage is low; in order to maintain normal combustion of garbage entering a furnace, other auxiliary fuels with high calorific value, such as coal, fuel oil and the like, have to be mixed and burned, and the situation is worse for the garbage incineration in northern areas in winter; in winter, rain and snow weather can increase the moisture content in the garbage, the moisture content can be mixed in the garbage in the form of ice blocks and the like, and part of northern areas still adopt a coal-fired mode for heating, so that a large amount of slag, furnace ash and the like which do not have a heat value are mixed in the household garbage entering the furnace, and equipment failure is easily caused.
The specific impact of northern winter climate on waste incineration includes:
(1) due to freezing, frozen moisture cannot be removed in the filter pressing process, so that the drying time of the garbage in a drying section is prolonged after the garbage is put into a furnace, the length of the drying section is increased, the combustion point of a fire grate is delayed backwards, the normal combustion and burnout time is shortened, the combustion is insufficient, and the heat efficiency is reduced; the ice blocks are mixed in the garbage, and the melting process can lead to the flame in the combustion process to be extinguished, thereby bringing great risk to the safe operation of the boiler, and the incomplete combustion can also lead to the aggravation of the smoke pollution.
(2) Temperature is less than zero winter in north, and moisture in the rubbish has increased the vapor partial pressure in the flue gas, makes flue gas dew point temperature rise, corrodes the afterbody heated surface, in order to reduce the corrosion rate, burns the used air of burning furnace burning and need preheat with high-quality steam, and this energy utilization efficiency that makes the rubbish power plant reduces, if: for a 500t/d incinerator, the primary air volume is about 6600Nm3If the primary air is heated from-15 ℃ to 20 ℃, 2.5-3.5t of steam is consumed in each hour, which accounts for one tenth of the total steam quantity, and the heat efficiency loss of the whole plant is obvious; lower temperatures also result in a reduction in the rate of fermentation of the waste, requiring steam to be introduced into the fermentation tank, and further reducing the power generation capacity of the plant.
(3) The garbage contains water and ice to affect ignition, a large amount of water is vaporized to absorb heat to reduce the temperature of a combustion chamber, and the ignition heat is increased; with the increase of the moisture, the ignition process is delayed, the burning rate of the volatile matter is obviously reduced, namely, the moisture influences the separation of the garbage volatile matter; the water also has influence on the total amount and toxicity equivalent of dioxin during the incineration of the garbage, and the water promotes the synthesis of the dioxin on the whole and improves the toxicity equivalent of dioxin discharge through activating the active position of the fly ash.
If the garbage can be dried before incineration, the moisture content is reduced, the flue gas amount generated by unit garbage can be reduced, the flue gas dew point and the smoke exhaust loss can be reduced, the combustion condition can be improved, and the temperature of a hearth can be correspondingly increased; more water-cooled wall heating surfaces can be arranged, auxiliary fuel is saved, and the garbage burnout rate is improved. Therefore, in order to improve the combustion condition and maintain the self-combustion of the garbage or reduce the coal blending ratio during the incineration, the garbage needs to be subjected to drying pretreatment and energy quality improvement. At present, a plurality of drying methods are provided before domestic garbage enters a furnace, and the drying methods comprise the modes of increasing the temperature of a garbage unloading hall by additionally arranging a heating device, heating a garbage pool by introducing low-temperature and low-pressure steam, heating garbage in the garbage pool by arranging heating air, increasing the number of garbage fermentation days and the like, but the effect is not ideal, and the problems of less generated heat, insufficient steam production of a waste heat boiler and the like still exist in garbage combustion; when the technology of improving the primary air temperature is adopted to treat the northern high-water-content garbage, the technical scheme of increasing the heating area of the air preheater or the technical scheme of adding one air preheater is adopted, so that the investment cost is high, and the system change is large.
In the prior published patent documents:
(1) for example, patent document CN202993220U entitled high temperature flue gas circulation system of mechanical grate garbage incinerator, which recycles flue gas for air used in drying section of grate, dust in flue gas will wear out grate furnace. The temperature of the extracted flue gas is higher than 550 ℃, the circulating fan and the pipeline both need to be made of stainless steel, and the investment cost is high. In addition, the drying section of the method is only introduced with high-temperature flue gas, and hot air adopted by a conventional incinerator is not introduced, so that the method is not suitable for the transformation of the conventional incinerator.
(2) As another example, patent document with an authorization publication number of CN201396766Y entitled waste heat energy recycling device for recycling flue gas of a waste incinerator, which uses flue gas recycling for air supply of a drying section and a burnout section of the grate, has a complex system structure, and does not help to reduce the burning rate of the incinerator when the flue gas recycling is used for the burnout section of the grate. The extracted flue gas has lower temperature and limited influence on the drying of the garbage.
(3) As for patent documents with application publication number of CN104141958A, namely a mechanical waste incineration boiler flue gas waste heat recycling system and an automatic control method, the flue gas is recycled to be used in a secondary air and grate drying section, the system flue gas temperature is low, the flue gas amount in the drying process is large, and the stability of a hearth is affected; the low-temperature flue gas has high humidity, the flue has poor heat preservation or air leakage, the circulating flue is easy to dewfall, the content of acid gas in the flue gas is high, the pipeline and the circulating fan are easy to corrode, the circulating flue is too long in length and large in resistance from the tail part to the bottom of the incinerator, and the flue is easy to corrode.
In conclusion, because the temperature of the hearth is higher, the influence of the extracted flue gas of the hearth on the evaporation amount of an evaporation surface is larger, the requirements of high temperature on a pipeline and a circulating fan are higher, and the equipment damage rate is higher; the tail flue gas temperature is lower, and required flue gas volume is great, and the fan power consumption height, if a large amount of flue gas after the drying gets into furnace once more can seriously influence furnace operating stability, and the dry homogeneity of rubbish can't be guaranteed.
Disclosure of Invention
The purpose of the invention is as follows: to the problem that domestic waste moisture content is high, the calorific value is low, the utility model provides a system of high moisture content domestic waste is handled in the recycling of utilization high temperature flue gas of low manufacturing or transformation cost, low energy consumption operation.
The technical scheme is as follows:
a system for recycling high-temperature flue gas to treat high-moisture-content household garbage comprises a combustion furnace, a flue gas extraction device, a flue gas purification device, a garbage drying device and a gas distribution device; a two-stage economizer is arranged in a tail flue of the combustion furnace; the smoke extraction device comprises a smoke extraction opening, a circulating fan and a smoke pipeline; the method is characterized in that: the smoke extraction port is positioned in the middle of the two-stage coal economizer; the garbage drying device comprises a horizontal flue gas air chamber and a vertical drying air chamber, and the flue gas pipeline is respectively communicated with the horizontal flue gas air chamber and the vertical drying air chamber through control valves; the gas distribution device comprises a horizontal flue gas air chamber gas distribution device and a vertical drying air chamber flue gas distribution device, the horizontal flue gas air chamber gas distribution device is arranged in the horizontal flue gas air chamber, and the vertical drying air chamber flue gas distribution device is arranged in the vertical drying air chamber; and the vertical drying air chamber is also provided with a hot air drying air inlet.
The utility model discloses processing system and method, send to the vertical drying plenum of rubbish feed inlet bottom horizontal flue gas plenum and grate drying section lower part after extracting the dust removal through the high temperature flue gas with between two-stage economizer, with burn the former hot-air drying wind antithetical couplet of burning furnace and ally oneself with, dry high moisture content is gone into stove rubbish, improves the calorific value that gets into the section of burning rubbish of burning. The flow direction of the high-temperature flue gas drying air in the vertical drying air chamber is perpendicular to the grate drying section, and the flow direction of the high-temperature flue gas drying air in the horizontal flue gas air chamber is parallel to the grate drying section, so that wet garbage is dried by flue gas from two directions, and the phenomenon of non-uniform garbage drying is avoided.
High-temperature flue gas is extracted from the middle of the two-stage coal economizer, an electric valve is arranged at the upper inlet and the outlet of a flue, when the water content of the garbage is larger than a certain threshold value, the electric valve is opened through an automatic control system, and the high-temperature flue gas is extracted and sent into a vertical drying air chamber and a horizontal flue gas air chamber of a garbage incinerator grate; the circulating fan adopts frequency conversion adjustment, and the amount of extracted flue gas can be adjusted according to the water content of the garbage; a cyclone separator is arranged in front of the circulating fan, a discharge valve is arranged at the lower end of the separator, a pneumatic conveying device is arranged below the discharge valve, fly ash in high-temperature flue gas is separated, and the fly ash is conveyed into an ash chamber; in order to realize more efficient drying, the system adopts an automatic measurement and control system, and a flue gas flowmeter, a thermometer and the like are arranged on a flue and are used for flue gas flow measurement, flue gas temperature measurement, circulating fan rotating speed regulation, air plate angle regulation, flue electric valve switch and the like.
Specifically, the utility model extracts the flue gas (about 300-400 ℃) from the two-stage economizer of the waste heat boiler, and the flue gas is conveyed to a vertical drying air chamber and a horizontal flue gas air chamber through a high-temperature fan after being dedusted by a cyclone separator; the vertical drying air chamber is connected with high-temperature flue gas drying air and incinerator primary hot air drying air; the horizontal flue gas air chamber is connected with high-temperature flue gas drying air, the horizontal flue gas air chamber is positioned at the bottom of the garbage feeding port and has the same width with the hearth, and the flow direction of flue gas at the outlet of the gas distribution hole is parallel to the drying section of the grate.
In order to ensure that the water content of garbage entering an incineration section of the grate furnace is stable within a certain range, 3-6 adjusting air plates are arranged in the vertical drying air chamber, the size of each adjusting air plate is attached to the wall surface of the drying air chamber, and the size and the deflection angle of an air distribution hole of the horizontal flue gas air chamber are adjustable; according to the change of the water content of the garbage, the deflection angle and the size of the air distribution holes are changed, so that the hot flue gas distribution of the drying section of the fire grate is changed, the change of the water content of the garbage entering the burning section is ensured to be small as much as possible, and the burning stability of a hearth is improved.
According to the difference of the moisture content W of the garbage entering the furnace, the air supply of the drying section of the fire grate has the following three working modes for reference:
working mode 1: when W is less than 50%, the hot air drying air of the vertical drying air chamber is started, and the high-temperature flue gas of the horizontal flue gas air chamber and the high-temperature flue gas drying air of the vertical drying air chamber are closed.
The working mode 2 is as follows: and when the W is less than 58% by 50%, starting hot air drying air of the vertical drying air chamber and high-temperature flue gas drying air of the vertical drying air chamber, and closing the high-temperature flue gas drying air of the horizontal flue gas air chamber.
Working mode 3: when the air flow rate is 58% W, hot air drying air of the vertical drying air chamber, high-temperature flue gas drying air of the vertical drying air chamber and high-temperature flue gas drying air of the horizontal flue gas air chamber are all started.
The utility model utilizes the medium-high temperature flue gas to recycle and treat the high-moisture-content domestic garbage, and the high-moisture-content domestic garbage is dried by extracting the high-temperature flue gas in the middle of the two-stage economizer, compared with the drying of garbage outside a hearth, the system is simpler without additional equipment; compared with the method of increasing the temperature of the garbage discharging hall/increasing the fermentation time, the method can effectively control the moisture in the garbage entering the incineration section of the incinerator; compared with the method for improving the primary air temperature, the method does not need to additionally increase the heating surface of the air preheater, saves system investment, is flexible to operate, can open the circulating flue gas when the water content is high and close the circulating flue gas when the water content is low, and has short response time and high speed.
Has the advantages that:
(1) the sampling port for extracting the flue gas is arranged between the two stages of coal economizers, and is mainly used for balancing the extracted flue gas quantity, the extracted flue gas temperature and the influence on the operation of the incinerator. The flue gas at the position is extracted, the temperature is reasonable and is 300-400 ℃, and the flue gas extraction device has the advantages of moderate flow and moderate temperature; relatively speaking, the furnace flue gas temperature is high, and is required highly to equipment, and the afterbody flue gas temperature is low, and the extraction flue gas volume is big, consequently this patent with the flue gas extraction mouth as for between the two-stage economizer. And extracting the smoke. Compared with the method for extracting the tail flue gas, the system has the advantages of small amount of the required drying flue gas, small fan power, small flue gas humidity, no low-temperature corrosion phenomenon and high drying speed; compared with the method for extracting the flue gas with higher temperature, the circulating flue gas pipeline and the fan of the system do not need stainless steel, and only carbon steel is adopted, so that the investment cost is low.
(2) The cyclone separator is added on the circulating flue, so that the abrasion of circulating flue gas to a grate furnace and a circulating fan is reduced, and the reliability and the economical efficiency of the system are improved; the vertical drying and the horizontal drying are combined, the garbage drying process is more reasonable, the phenomenon that the unidirectional flue gas drying brings unevenness is avoided, the adjustment is flexible, and the garbage containing water entering the grate incineration section can be reduced to a certain range.
(3) The smoke recycling is adopted to treat the high-moisture-content domestic garbage, which is beneficial to improving the pollutant emission of the high-temperature area of the incinerator and reducing NO in combustion productsxContent of realizing low NOxBurning; the water vapor generated in the drying process enters the hearth and then generates coal gasification reaction to generate water gas, so that the incineration efficiency is improved, and the generation amount of fly ash is reduced.
(4) This system is applicable to current msw incineration factory and burns high moisture rubbish and reforms transform, need not to change the msw incineration furnace grate structure, need not to increase the dry segment length of grate, and drying system can switch the mode according to the height of rubbish moisture content, accords with actual production needs more.
Drawings
FIG. 1 is a system diagram of the present invention;
FIG. 2 is a diagram of a horizontal flue gas plenum;
FIG. 3 is a schematic view of a vertical drying plenum;
in the drawings: 1-an evaporator; 2-a superheater; 3-a coal economizer; 4-a cyclone separator; 5-circulating fan; 6-vertical drying wind chamber; 7-a combustion air chamber; 8-an over-fire air chamber; 9-a grate drying section; 10-a grate combustion section; 11-a fire grate burnout section; 12-between ash residues; 13-a pusher; 14-a horizontal flue gas plenum; 15-hearth; 16-a discharge hopper; 3-1 smoke extraction port; 6-1 hot air valve; 6-2 high-temperature flue gas valve; 6-3 adjusting air plates; 14-1 air distribution holes; 14-2 high temperature flue gas valve.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings.
The utility model discloses a system for recycling high-moisture content domestic garbage by utilizing high-temperature flue gas, as shown in figure 1,
the treatment system comprises a flue gas extraction device, a flue gas purification device, a garbage drying device, a gas distribution device and the like; the flue gas extraction device comprises a flue gas extraction port 3-1 positioned in the middle of the two-stage coal economizer, a circulating fan 5, a flue gas pipeline and the like; the flue gas purification device is a high-temperature cyclone dust collector 4; the garbage drying device comprises a horizontal flue gas air chamber 14 and a vertical drying air chamber 6; the air distribution device comprises a horizontal flue gas air chamber air distribution hole 14-1 and a vertical drying air chamber flue gas adjusting air plate 6-3.
Firstly, high-temperature flue gas in the middle of two stages of coal economizers of a coal economizer 3 is extracted into a heat-insulating pipeline by a high-temperature circulating fan 5 through a flue gas extraction opening 3-1, the flue gas is removed of carried fly ash by a cyclone separator 4 before being sent into a vertical drying air chamber 6 and a horizontal flue gas air chamber 14, and the fly ash directly enters an ash chamber 12; the high-temperature flue gas drying air and the hot air drying air are adjusted in the air flow direction in the vertical drying air chamber 6 by the adjusting air plate 6-3; after entering the pusher 13 through the discharging hopper 16, the garbage is subjected to convection drying by the high-temperature flue gas drying air in the lateral horizontal flue gas air chamber 14.
Specifically, aiming at the garbage entering the furnace with different water contents W, the air supply of the drying section of the fire grate has the following three working modes for reference:
working mode 1: when W is less than 50%, the hot air drying air of the vertical drying air chamber 6 is started, and the high-temperature flue gas drying air of the horizontal flue gas air chamber 14 and the high-temperature flue gas drying air of the vertical drying air chamber 6 are closed. The high-temperature flue gas valve 6-2 and the high-temperature flue gas valve 14-2 are closed, the hot air valve 6-1 is opened, and the original hot air drying air of the incinerator is sent into the drying air chamber 6. At the moment, the moisture content of the garbage entering the furnace is lower, and the moisture content requirement of an incineration section can be met under the radiation in the furnace and the drying of hot air.
The working mode 2 is as follows: when 50% < W <58%, the hot air drying air and the high temperature flue gas drying air in the vertical drying plenum 6 are turned on and the horizontal flue gas plenum 14 is turned off. Because the moisture content is further improved, the drying requirement can not be met only by hot air drying air, and at the moment, in order to reduce the moisture content, the high-temperature flue gas drying air of the vertical drying air chamber 6 is opened on the basis of the working mode 1. Firstly, high-temperature flue gas in the middle of two stages of coal economizers of an economizer 3 is extracted into a heat insulation pipeline by a circulating fan 5 through a flue gas extraction port 3-1, a high-temperature flue gas valve 14-2 is closed, a high-temperature flue gas valve 6-2 and a hot air valve 6-1 are opened, and hot air drying air and high-temperature flue gas drying air are sent into a drying air chamber 6. The high-temperature flue gas circulating air quantity can be correspondingly adjusted by adjusting the rotating speed of the circulating fan 5.
Working mode 3: when the air flow rate is 58% < W, the hot air drying air and the high-temperature flue gas drying air in the vertical drying air chamber 6 are started, and the horizontal flue gas air chamber 14 is started. At the moment, the moisture content of the garbage entering the furnace exceeds the drying capacity of the vertical drying air chamber 6, and in order to meet the drying requirement, the horizontal flue gas air chamber 14 is opened to carry out horizontal drying, so that the drying capacity is improved, and the drying uniformity is improved. Firstly, high-temperature flue gas in the middle of two stages of coal economizers of a coal economizer 3 is extracted into a heat insulation pipeline through a flue gas extraction port 3-1 by a circulating fan 5, a high-temperature flue gas valve 14-2, a high-temperature flue gas valve 6-2 and a hot air valve 6-1 are all opened, hot air drying air and high-temperature flue gas drying air are sent into a drying air chamber 6, and the high-temperature flue gas drying air is sent into a horizontal flue gas air chamber 14. The high-temperature flue gas amount entering the vertical drying air chamber 6 and the horizontal flue gas air chamber 14 can be correspondingly adjusted by adjusting the rotating speed of the circulating fan 5, the opening degree of the high-temperature flue gas valve 6-2 and the opening degree of the high-temperature flue gas valve 14-2.
The above description of the embodiments of the present invention is provided to facilitate the understanding and application of the present invention for the relevant technical personnel, and is not intended to limit the protection scope of the present invention; on the basis of the principle and the technical scheme of the utility model, the modification and the improvement which are made by the technical personnel in the field without creative work are all within the protection scope of the utility model.
Claims (6)
1. A system for recycling high-temperature flue gas to treat high-moisture-content household garbage comprises a combustion furnace, a flue gas extraction device, a flue gas purification device, a garbage drying device and a gas distribution device; a two-stage economizer is arranged in a tail flue of the combustion furnace; the smoke extraction device comprises a smoke extraction opening, a circulating fan and a smoke pipeline; the method is characterized in that: the smoke extraction port is positioned in the middle of the two-stage coal economizer; the garbage drying device comprises a horizontal flue gas air chamber and a vertical drying air chamber, and the flue gas pipeline is respectively communicated with the horizontal flue gas air chamber and the vertical drying air chamber through control valves; the gas distribution device comprises a horizontal flue gas air chamber gas distribution device and a vertical drying air chamber flue gas distribution device, the horizontal flue gas air chamber gas distribution device is arranged in the horizontal flue gas air chamber, and the vertical drying air chamber flue gas distribution device is arranged in the vertical drying air chamber; and the vertical drying air chamber is also provided with a hot air drying air inlet.
2. The system of claim 1, wherein: the flue gas purification device is a high-temperature cyclone dust collector.
3. The system of claim 1, wherein: the temperature of the flue gas extracted by the flue gas extraction port is 300-400 ℃.
4. The system of claim 1, wherein: the horizontal flue gas plenum air distribution device is an air distribution hole positioned on the air distribution plate.
5. The system of claim 4, wherein: the size and deflection angle of the air distribution holes can be adjusted.
6. The system of claim 1, wherein: the vertical drying air chamber flue gas distribution device is 3-6 adjusting air plates vertically arranged in the vertical drying air chamber, and the adjusting air plates can adjust the deflection angle in the vertical direction.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464950A (en) * | 2021-06-04 | 2021-10-01 | 光大环境科技（中国）有限公司 | Household garbage incineration system based on flue gas recirculation multilayer air distribution |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464950A (en) * | 2021-06-04 | 2021-10-01 | 光大环境科技（中国）有限公司 | Household garbage incineration system based on flue gas recirculation multilayer air distribution |
| CN113464950B (en) * | 2021-06-04 | 2023-06-13 | 光大环境科技（中国）有限公司 | Household garbage incineration system based on smoke recycling multilayer air distribution |
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