CN112797422B - Low-calorific-value sludge smoldering treatment method - Google Patents
Low-calorific-value sludge smoldering treatment method Download PDFInfo
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- CN112797422B CN112797422B CN202011604933.3A CN202011604933A CN112797422B CN 112797422 B CN112797422 B CN 112797422B CN 202011604933 A CN202011604933 A CN 202011604933A CN 112797422 B CN112797422 B CN 112797422B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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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
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2204/00—Supplementary heating arrangements
- F23G2204/10—Supplementary heating arrangements using auxiliary fuel
- F23G2204/101—Supplementary heating arrangements using auxiliary fuel solid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/12—Sludge, slurries or mixtures of liquids
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- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the technical field related to solid waste treatment, and discloses a smoldering treatment method for low-calorific-value sludge, which comprises the following steps: mixing the low-heat-value sludge, auxiliary fuel and porous medium, and putting the mixture into a smoldering furnace for smoldering combustion, wherein the proportions of the low-heat-value sludge, the auxiliary fuel and the porous medium are respectively 16.6-21.4%, 2.8-5.0% and 75-80%. According to the method, the low-heat-value sludge is firstly mixed with a small amount of auxiliary fuel and a large amount of porous media to realize the modification of the low-heat-value sludge, so that the low-heat-value sludge can be treated through a smoldering process, the treatment mode of the low-heat-value sludge is enlarged, and the method has good economical efficiency.
Description
Technical Field
The invention belongs to the technical field related to solid waste treatment, and particularly relates to a smoldering treatment method for low-calorific-value sludge.
Background
Smoldering disposal is a novel direct combustion disposal technology aiming at high-water-content and low-calorific-value organic solid waste. Organic solid waste which cannot be directly independently combusted in a conventional combustion device is mixed with porous medium filler, and independent self-sustaining combustion disposal can be realized by forced air supply under the condition of providing a small amount of external heat through a smoldering technology. However, when the ash content is 40% or more of the dry mass, the calorific value of the sludge is too low, and therefore, the conventional smoldering treatment cannot be performed.
In the traditional flame combustion field, low-heat-value fuel is often subjected to mixed combustion, but during mixed combustion, the main body of the mixed combustion is still high-heat-value combustion, and low-heat-value combustion substances account for 5% -30%, so that batch treatment of low-heat-value fuel with high ash content cannot be met. Therefore, it is necessary to design a new low-calorific-value sludge smoldering treatment method to meet the increasing demand for low-calorific-value fuel treatment.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a low-calorific-value sludge smoldering treatment method, which is characterized in that the low-calorific-value sludge is firstly mixed with a small amount of auxiliary fuel and a large amount of porous media to realize the modification of the low-calorific-value sludge, so that the low-calorific-value sludge can be treated by a smoldering process, the treatment mode of the low-calorific-value sludge is expanded, the treatment mode is simple, and the economy is good.
To achieve the above objects, according to one aspect of the present invention, there is provided a smoldering treatment method for low heating value sludge, the method comprising: mixing the low-heat-value sludge, auxiliary fuel and porous medium, and putting the mixture into a smoldering furnace for smoldering combustion, wherein the proportions of the low-heat-value sludge, the auxiliary fuel and the porous medium are respectively 16.6-21.4%, 2.8-5.0% and 75-80%.
Preferably, the auxiliary fuel is agricultural and forestry waste.
Preferably, the auxiliary fuel is one or a mixture of sawdust, rice hulls or straws.
Preferably, the heat value of the auxiliary fuel is greater than or equal to 15MJ/kg, and the particle size of the auxiliary fuel is less than or equal to 0.5 mm.
Preferably, the porous medium is sand or slag.
Preferably, the particle size of the porous medium is 0.5mm to 2 mm.
Preferably, the mixing of the low-calorific-value sludge, the auxiliary fuel and the porous medium and then putting into a smoldering furnace for smoldering combustion specifically comprises the following steps: putting the mixture into a smoldering furnace, continuously heating the mixture at the bottom at 220-300 ℃, and simultaneously supplying air from the bottom of the furnace upwards at a Darcy flow rate of 2.0-6.5 cm/s until the mixture reaches 400-600 ℃.
Preferably, the low-heat-value sludge is sludge with the water content of more than 80%, or sludge with the water content of 70-80% and the dry-basis ash content of 23-48%, or sludge with the water content of 60-70% and the dry-basis ash content of 48-61%, or sludge with the heat value of less than 1.6 MJ/kg.
Preferably, the water content of the low-heating-value sludge is 80%, and the proportions of the low-heating-value sludge, the auxiliary fuel and the porous medium are respectively 20.8%, 4.2% and 75%.
Generally, compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the smoldering treatment of the low-heat-value sludge can be realized by mixing the low-heat-value sludge which cannot realize smoldering with a small amount of auxiliary fuel and proper porous media, so that the treatment path of the low-heat-value sludge is remarkably expanded;
2. the auxiliary fuel added into the low-calorific-value sludge is agricultural and forestry waste such as sawdust and rice hulls, the amount of the auxiliary fuel is only 2.8-5.0% and is very small, the price of the agricultural and forestry waste is very low firstly, the amount of the agricultural and forestry waste added is very small, and the economical efficiency is good;
3. the porous medium layer is sand and slag which are cheap and easy to obtain, is simple and easy to obtain, is easy to manufacture and is convenient for industrial application;
4. for common low-heat-value sludge with the water content of about 80%, when the proportions of the low-heat-value sludge, the auxiliary fuel and the porous medium are respectively 20.8%, 4.2% and 75%, the smoldering combustion can be realized, the maximum treatment capacity of the low-heat-value sludge can be realized, and the best economical efficiency is realized;
5. the method and the device can treat the low-heat-value sludge with high water content, and solve the technical problem that the existing process can not treat the sludge with high water content.
Drawings
FIG. 1 is a flow chart schematically showing the smoldering treatment method for low-heating value sludge of the present embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a smoldering treatment method for low-heat-value sludge, which comprises the steps of mixing the low-heat-value sludge with auxiliary fuel and porous medium, and putting the mixture into a smoldering furnace for smoldering combustion, wherein the proportions of the low-heat-value sludge, the auxiliary fuel and the porous medium are respectively 16.6-21.4%, 2.8-5.0% and 75-80%. Further, for common low-heat value sludge with the water content of about 80%, the proportions of the low-heat value sludge, the auxiliary fuel and the porous medium are preferably 20.8%, 4.2% and 75%, respectively.
The low-heat-value sludge is sludge with the water content of more than 80 percent, or sludge with the water content of 70-80 percent and the dry-basis ash content of 23-48 percent, or sludge with the water content of 60-70 percent and the dry-basis ash content of 48-61 percent, or sludge with the heat value of less than 1.6 MJ/kg.
The heat value of the auxiliary fuel is more than or equal to 15MJ/kg, and the particle size of the auxiliary fuel is less than or equal to 0.5 mm. Furthermore, the auxiliary fuel is agricultural and forestry waste, and is preferably one or a mixture of sawdust, rice hulls or straws.
The porous medium is sand or slag. The particle size of the porous medium is 0.5 mm-2 mm.
The method comprises the following steps of mixing the low-calorific-value sludge with auxiliary fuel and porous medium, and putting the mixture into a smoldering furnace for smoldering combustion: putting the mixture into a smoldering furnace, continuously heating the mixture at the bottom at 220-300 ℃, and simultaneously supplying air from the bottom of the furnace upwards at a Darcy flow rate of 2.0-6.5 cm/s until the mixture reaches 400-600 ℃.
The smoldering condition is preferably a self-sustaining condition, that is, a condition that satisfies self-sustaining characteristics of the smoldering disposal process, and is generally: the heating target temperature is 220-300 ℃, and more preferably 250 ℃; the heating time is 2-4 h, preferably 3h, and the Darcy flow velocity of the air supplied in the smoldering furnace is 2.0-6.5 cm/s, preferably 3.5 cm/s.
When the smoldering treatment is carried out, firstly, the sludge with low heat value to be treated is mixed with the auxiliary fuel and the porous medium, then the mixture is put into a smoldering treatment device to be heated by one-time ignition (the heating target temperature of a bottom filler is 220-300 ℃) and continuously supplied with air at the Darcy flow rate of 2.0-6.5 cm/s, so that the self-continuous propagation of the smoldering reaction along the direction of air flow is realized (the average propagation rate of a reaction surface is 0.18-0.62 cm/min) until all the sludge undergoes the smoldering reaction at the temperature of 400-600 ℃. The porous medium in the ash after smoldering treatment can be recycled.
Example 1
The water content of certain municipal sludge is 80 percent, the dry basis ash content is 45 percent, the municipal sludge, sawdust and sand are uniformly mixed according to the proportion of 20.8 percent, 4.2 percent and 75 percent, then the mixture is added into a smoldering furnace device with the diameter of 1.13m, the temperature is raised for 3 hours until the temperature of bottom filler reaches 250 ℃, air is forced to be supplied into the furnace from bottom to top, the Darcy flow rate in the furnace is 3.3cm/s, and the treatment amount of the municipal sludge is about 49.7 kg/h.
Example 2
The water content of certain municipal sludge is 80 percent, the dry basis ash content is 45 percent, the municipal sludge, sawdust and sand are uniformly mixed according to the proportion of 16.6 percent, 3.4 percent and 80 percent, then the mixture is added into a smoldering furnace device with the diameter of 1.13m, the temperature is raised for 3 hours until the temperature of bottom filler reaches 250 ℃, air is forced to be supplied into the furnace from bottom to top, the Darcy flow rate in the furnace is 3.3cm/s, and the treatment amount of the municipal sludge is about 34.3 kg/h.
Example 3
The water content of certain municipal sludge is 80 percent, the dry basis ash content is 45 percent, the municipal sludge, sawdust and sand are uniformly mixed according to the proportion of 18 percent, 2.8 percent and 79.2 percent, then the mixture is added into a smoldering furnace device with the diameter of 1.13m, the temperature is raised for 3 hours until the temperature of bottom filler reaches 250 ℃, air is forced to be supplied into the furnace from bottom to top, the Darcy flow rate in the furnace is 3.3cm/s, and the treatment amount of the municipal sludge is about 28.2 kg/h.
Example 4
The water content of certain municipal sludge is 80 percent, the dry basis ash content is 45 percent, the municipal sludge, sawdust and sand are uniformly mixed according to the proportion of 21.4 percent, 3.5 percent and 75.1 percent, then the mixture is added into a smoldering furnace device with the diameter of 1.13m, the temperature is raised for 3 hours until the temperature of bottom filler reaches 250 ℃, air is forced to be supplied into the furnace from bottom to top, the Darcy flow rate in the furnace is 3.3cm/s, and the treatment amount of about 30.4kg/h of the municipal sludge can be realized.
Example 5
The water content of certain municipal sludge is 80 percent, the dry basis ash content is 45 percent, the municipal sludge, sawdust and sand are uniformly mixed according to the proportion of 18 percent, 5.0 percent and 77 percent, then the mixture is added into smoldering furnace equipment with the diameter of 1.13m, the temperature is raised for 3 hours until the temperature of bottom filler reaches 250 ℃, forced air supply is started from bottom to top in the furnace, the Darcy flow rate in the furnace is 3.3cm/s, and at the moment, the treatment amount of about 32.5kg/h of the municipal sludge can be realized.
Example 6
The water content of certain municipal sludge is 80 percent, the dry basis ash content is 45 percent, the municipal sludge, rice hulls and furnace slag are uniformly mixed according to the proportion of 20.8 percent, 4.2 percent and 75 percent, then the mixture is added into a smoldering furnace device with the diameter of 1.13m, the temperature is raised for 3 hours until the temperature of bottom filler reaches 250 ℃, air is forced to be supplied into the furnace from bottom to top, the Darcy flow rate in the furnace is 3.3cm/s, and the treatment amount of the municipal sludge is about 45.2 kg/h.
In summary, according to the low-calorific-value sludge smoldering treatment method, the low-calorific-value sludge is firstly mixed with a small amount of auxiliary fuel and a large amount of porous media to realize the modification of the low-calorific-value sludge, so that the low-calorific-value sludge can be treated through a smoldering process, and the treatment mode of the low-calorific-value sludge is expanded.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The smoldering treatment method for the low-heating-value sludge is characterized by comprising the following steps of:
the method comprises the following steps of mixing low-heat-value sludge, auxiliary fuel and porous medium, and putting the mixture into a smoldering furnace for smoldering combustion, wherein the proportions of the low-heat-value sludge, the auxiliary fuel and the porous medium are respectively 16.6% -21.4%, 2.8% -5.0% and 75% -80%, the heat value of the auxiliary fuel is more than or equal to 15MJ/kg, and the particle size of the auxiliary fuel is less than or equal to 0.5 mm.
2. The method of claim 1, wherein the auxiliary fuel is agricultural or forestry waste.
3. The method of claim 2, wherein the auxiliary fuel is one or a mixture of sawdust, rice hulls, or straw.
4. The method of claim 1, wherein the porous medium is sand or slag.
5. The method of claim 4, wherein the porous medium has a particle size of 0.5mm to 2 mm.
6. The method according to claim 1, wherein the mixing of the low-heating-value sludge, the auxiliary fuel and the porous medium and then putting the mixture into a smoldering furnace for smoldering combustion specifically comprises the following steps: putting the mixture into a smoldering furnace, continuously heating the mixture at the bottom at 220-300 ℃, and simultaneously supplying air from the bottom of the furnace upwards at a Darcy flow rate of 2.0-6.5 cm/s until the mixture reaches 400-600 ℃.
7. The method according to claim 1, wherein the low heating value sludge is sludge with water content of more than 80%, or sludge with water content of 70-80% and dry ash content of 23-48%, or sludge with water content of 60-70% and dry ash content of 48-61%, or sludge with heating value of less than 1.6 MJ/kg.
8. The method according to claim 1 or 7, characterized in that the water content of the low heating value sludge is 80%, and the proportions of the low heating value sludge, the auxiliary fuel and the porous medium are 20.8%, 4.2% and 75%, respectively.
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| CN202011604933.3A CN112797422B (en) | 2020-12-30 | 2020-12-30 | Low-calorific-value sludge smoldering treatment method |
| PCT/CN2021/095940 WO2022142098A1 (en) | 2020-12-30 | 2021-05-26 | Low-calorific-value sludge smoldering treatment method |
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| CN112797422B (en) * | 2020-12-30 | 2021-11-19 | 华中科技大学 | Low-calorific-value sludge smoldering treatment method |
| CN115820315B (en) * | 2022-09-21 | 2024-04-19 | 中南大学 | Combustion-supporting material for smoldering of low-concentration organic matter polluted soil, and preparation method and application thereof |
| CN116040904A (en) * | 2022-12-07 | 2023-05-02 | 华中科技大学 | Treatment method for reducing heavy metals in oil sludge |
| CN117287703B (en) * | 2023-11-09 | 2024-06-07 | 北京汇园生态科技有限公司 | Urban solid waste treatment method |
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