CN109140463B - Method for incinerating cyclohexanone saponification waste alkali liquor - Google Patents
Method for incinerating cyclohexanone saponification waste alkali liquor Download PDFInfo
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- CN109140463B CN109140463B CN201710444159.6A CN201710444159A CN109140463B CN 109140463 B CN109140463 B CN 109140463B CN 201710444159 A CN201710444159 A CN 201710444159A CN 109140463 B CN109140463 B CN 109140463B
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- cyclohexanone
- waste
- lye
- waste alkali
- alkali liquor
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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
- F23G7/04—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste liquors, e.g. sulfite liquors
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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
- F23G2204/20—Supplementary heating arrangements using electric energy
- F23G2204/204—Induction
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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
- F23G2209/10—Liquid waste
- F23G2209/101—Waste liquor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2900/00—Special features of, or arrangements for incinerators
- F23G2900/50213—Preheating processes other than drying or pyrolysis
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses a method for incinerating cyclohexanone saponification waste lye, which is characterized in that the cyclohexanone saponification waste lye is preheated to 100-110 ℃, and then sprayed into a waste lye incinerator for combustion in an atomization mode. The temperature of the preheated cyclohexanone saponification waste lye is higher than the boiling point of water, when the waste lye is sprayed to the incinerator through a spray gun, the moisture is instantly vaporized, the saponification waste lye is dehydrated and dried, and is gradually combusted in the falling process, so that a combustion zone is elongated, the combustion effect is improved, meanwhile, the waste heat of the cyclohexanone saponification waste lye is fully utilized, and the energy consumption is reduced.
Description
Technical Field
The invention relates to a method for incinerating cyclohexanone saponification waste lye, in particular to a method for improving the incinerating effect of cyclohexanone saponification waste lye and reducing energy consumption by improving an incinerating device and an incinerating process, belonging to the technical field of chemical production wastewater treatment.
Background
The waste saponification alkali lye of cyclohexanone is the process waste water containing sodium carbonate, sodium hydroxide, sodium carboxylate, organic matters and the like generated in the production process of cyclohexanone, the COD concentration of the waste saponification alkali lye of cyclohexanone reaches 30 ten thousand mg/L, and about 0.8 ton of waste saponification alkali lye is generated per 1 ton of cyclohexanone. The saponified waste lye is difficult to treat because of high COD concentration and pH value up to 10-14, and can cause serious environmental pollution if directly discharged.
At present, the common process of treating waste saponification lye of cyclohexanone is incineration method, for example, Chinese patent (application No. 201610229862.0) discloses a method for preparing sodium carbonate and anhydrous sodium sulfate by using waste saponification lye of cyclohexanone. The incineration method is that the saponified waste lye is pumped into a waste lye incinerator by a pump and incinerated under the stirring of dry gas, natural gas, coal tar, oil slurry and other fuels, and the heat generated by incineration is recovered by a steam production mode. The temperature of the saponified waste alkali from the decomposition process of a common cyclohexanone device is 95-97 ℃, the saponified waste alkali is firstly conveyed to a saponified waste alkali storage tank by a pipeline, then conveyed to an incinerator waste alkali feeding alkali gun by a pump, and atomized and then enters the incinerator. In the incinerator, the water content of the waste alkali is gradually evaporated and dried in the falling process and falls to a combustion layer of an incineration hearth. After the combustion layer is further dried to a certain extent, it is ignited to form a mat combustion. The organic combustible components are changed into carbon dioxide and water, and the carbon dioxide and the water are formed into flue gas together with evaporated water, and the flue gas is introduced into a chimney by an induced draft fan to be discharged after the heat is recovered by an economizer and an air heat exchanger. The components such as sodium carbonate and sodium hydroxide which can not be combusted form sodium carbonate melt, the sodium carbonate melt flows out from the bottom of the hearth, and the sodium carbonate melt is recycled as a solid caustic soda byproduct for sale. In addition, a part of sodium carbonate and sodium hydroxide powder is mixed in the flue gas, recovered by an electrostatic dust removal system and conveyed to an ash bucket by a scraper for bagging and export sale. The existing method has some substantial defects, and the saponified waste alkali can cause certain heat loss when being sent to a waste alkali storage tank, and the heat loss can be reduced by 5-10 ℃ generally. In addition, the waste alkali is mainly dried and burnt in a combustion layer of a cushion layer, and the combustion efficiency is low.
Disclosure of Invention
Aiming at the defect that the incineration efficiency of the waste alkali is not high in the conventional incineration device and incineration process of the cyclohexanone saponification waste alkali liquor, the invention aims to provide a method for improving the incineration efficiency of the cyclohexanone saponification waste alkali liquor; the method has the advantages of simple operation, low cost and obvious effect.
In order to achieve the technical purpose, the invention provides a method for incinerating cyclohexanone saponification waste lye, which comprises the steps of preheating the cyclohexanone saponification waste lye to 100-110 ℃, and spraying the preheated cyclohexanone saponification waste lye into a waste alkali incinerator in an atomizing mode for combustion.
The key technical improvement of the technical scheme of the invention is that the temperature of the cyclohexanone saponification waste lye is preheated to 100-110 ℃, the temperature is higher than the normal pressure boiling point of water at the temperature of more than 100 ℃, after the waste lye is atomized by a spray gun and enters an incinerator, the flash evaporation of water is accelerated, the drying rate of the waste lye is improved, and most of the waste lye is combusted before falling on a cushion layer, so that a combustion zone is lengthened, the combustion efficiency is improved, and the reduction of energy consumption is realized.
In a preferable scheme, the preheating of the cyclohexanone saponification waste lye is realized by an electromagnetic heater. The technical scheme of the invention preferably adopts an electromagnetic heater, the electromagnetic heater technology is a process of converting electric energy into heat energy by utilizing an electromagnetic induction principle, 50/60Hz alternating current voltage is converted into direct current voltage by a rectifying circuit, the direct current voltage is converted into high-frequency voltage with the frequency of 20-40 kHz by a power control circuit, when high-speed changing alternating current passes through a coil, the coil can generate a high-speed changing magnetic field, when alternating magnetic lines of force in the magnetic field pass through a metal pipeline (magnetic conduction and electric conduction materials), countless small eddy currents are generated in the wall of the pipeline, so that the wall of the pipeline can automatically generate heat to exchange heat with materials in the pipeline, and the purpose of heating the materials is achieved. Because the waste alkali liquor contains highly corrosive substances such as sodium carbonate, sodium hydroxide, sodium carboxylate and the like, the waste alkali liquor is very easy to crystallize when the temperature is reduced, if the waste alkali liquor is heated by a common heat exchanger, the heat exchanger is easy to corrode or block, and the electromagnetic heating heats a waste alkali conveying pipeline, so that the pipeline has a large caliber and is not easy to block.
In a preferable scheme, the electromagnetic heater is arranged at the outlet of the waste lye feeding pump of the incinerator. The electromagnetic heater is preferably arranged at the outlet of the waste alkali liquor feeding pump of the incinerator, on the one hand, preheated cyclohexanone saponified waste alkali liquor directly enters the incinerator through atomization, energy loss is reduced, and on the other hand, the caliber of a pipeline at the outlet of the waste alkali liquor feeding pump of the incinerator is large, so that pipeline blockage is avoided.
In a further preferred scheme, cyclohexanone saponification waste alkali liquor from a cyclohexanone device decomposition process directly enters an inlet of a waste alkali liquor feeding pump of an incinerator, is preheated to 100-110 ℃ by an electromagnetic heater, and is sprayed into a waste alkali incinerator in an atomization mode for combustion. In the prior art, cyclohexanone saponification waste lye from a cyclohexanone device decomposition process is generally conveyed to a cyclohexanone saponification waste lye storage tank firstly and then conveyed to an incinerator by a pump for incineration, the cyclohexanone saponification waste lye can exchange heat easily in the storage tank to lose part of heat, and crystals are easily separated out from the cooled cyclohexanone waste lye, so that pipeline blockage is caused. The technical scheme of the invention fully recovers the waste heat of the cyclohexanone saponification waste lye from the cyclohexanone device decomposition process, reduces the energy consumption of the subsequent waste heat on one hand, and can prevent pipeline blockage on the other hand.
In a more preferable scheme, the temperature of the cyclohexanone saponification waste alkali liquor from the decomposition process of the cyclohexanone device is 95-97 ℃, the cyclohexanone saponification waste alkali liquor has higher waste heat, and the cyclohexanone saponification waste alkali liquor directly enters a waste alkali incinerator without a waste alkali storage tank, so that the heat loss of the waste alkali storage can be reduced, and the rest heat is fully utilized. If the material is put into a storage tank, the temperature is reduced by 5-10 ℃.
In a more preferable scheme, the cyclohexanone saponification waste lye is sprayed into a waste lye incinerator under the pressure of 2.0-3.3 MPa. The cyclohexanone saponification waste lye can be efficiently atomized and highly dispersed by proper pressure injection, and the combustion state of the cyclohexanone saponification waste lye is improved.
Compared with the prior art, the technical scheme of the invention has the beneficial technical effects that:
1) the combustion zone of the cyclohexanone saponification waste lye in the waste lye incinerator is lengthened, and the combustion efficiency is obviously improved;
2) the cyclohexanone saponification waste lye is fully utilized, the fuel consumption of burning is reduced, and the energy is saved.
3) The operation is simple, the realization is easy, and the popularization and the use are facilitated.
Drawings
FIG. 1 is a schematic diagram of the process of feeding waste alkali into an incinerator in the prior art.
FIG. 2 is a schematic view of the process of feeding waste alkali into an incinerator according to the present invention.
Wherein: 1-waste alkali storage tank, 2-waste alkali delivery pump, 3-incinerator, 4 is electromagnetic heater.
Detailed Description
The present invention will be further described with reference to the following drawings and examples, which are not intended to limit the scope of the claims.
13t/h of cyclohexanone saponification waste lye is conveyed to a waste alkali incineration device from the decomposition process of a cyclohexanone device, directly enters an inlet of a waste alkali conveying pump 2 without entering a waste alkali storage tank 1, is pressurized to about 2.5MPa through the conveying pump, passes through an electromagnetic heater 4 on an outlet pipeline, and then enters an incinerator 3 for combustion. Under the working condition, the fuel oil slurry consumption is 1.3 t/h. The same amount of waste alkali treatment before the invention is adopted, and the fuel oil slurry consumption is 1.6 t/h.
While the invention has been described in connection with specific embodiments thereof, it will be understood that these should not be construed as limiting the scope of the invention, which is defined in the appended claims, any variation which comes within the scope of the invention.
Claims (4)
1. A method for incinerating cyclohexanone saponification waste lye is characterized in that: preheating cyclohexanone saponification waste alkali liquor to 100-110 ℃, and spraying the waste alkali liquor into a waste alkali incinerator in an atomization mode for combustion;
preheating the cyclohexanone saponification waste alkali liquor by an electromagnetic heater;
the electromagnetic heater is arranged at the outlet of the waste alkali liquor feeding pump of the incinerator;
the electromagnetic heater is heated by using high-frequency voltage with the frequency of 20-40 kHz.
2. The method for incinerating saponified waste lye of cyclohexanone as set forth in claim 1, wherein: and (3) directly feeding the cyclohexanone saponification waste alkali liquor from the decomposition process of the cyclohexanone device into an inlet of a waste alkali liquor feeding pump of an incinerator, preheating the waste alkali liquor to 100-110 ℃ by an electromagnetic heater, and spraying the waste alkali liquor into the waste alkali incinerator in an atomization mode for combustion.
3. The method for incinerating saponified waste lye of cyclohexanone as set forth in claim 2, wherein: the temperature of the waste alkali liquor of cyclohexanone saponification from the decomposition process of the cyclohexanone device is 95-97 ℃.
4. The method for incinerating saponified waste lye of cyclohexanone as set forth in claim 2, wherein: and spraying the cyclohexanone saponification waste lye into a waste lye incinerator under the pressure of 2.0-3.3 MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710444159.6A CN109140463B (en) | 2017-06-13 | 2017-06-13 | Method for incinerating cyclohexanone saponification waste alkali liquor |
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| CN201710444159.6A CN109140463B (en) | 2017-06-13 | 2017-06-13 | Method for incinerating cyclohexanone saponification waste alkali liquor |
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| CN109140463A CN109140463A (en) | 2019-01-04 |
| CN109140463B true CN109140463B (en) | 2020-12-18 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1451140A (en) * | 1973-03-28 | 1976-09-29 | Bayer Ag | Process for the oxidation of hydrocarbons |
| CN1215696A (en) * | 1997-10-23 | 1999-05-05 | 巴陵石油化工公司鹰山石油化工厂 | Method and apparatus for incineration treatment of caprolactam saponification waste lye to recover sodium carbonate |
| CN1293223A (en) * | 1999-10-18 | 2001-05-02 | 巴陵石化鹰山石油化工厂 | Process for evaporating, concentrating and drying waste saponifying alkali solution |
| CN1354341A (en) * | 2000-11-17 | 2002-06-19 | 中国石油化工股份有限公司巴陵分公司 | Method for raising treatment capacity of saponified waste lye incinerator and its equipment |
| CN103822216A (en) * | 2014-03-18 | 2014-05-28 | 江苏星瑞化工工程科技有限公司 | Incineration method for saliferous organic mixed effluent |
| CN203656941U (en) * | 2013-12-31 | 2014-06-18 | 泰兴市裕廊化工有限公司 | Acrylic acid waste liquid incineration system |
-
2017
- 2017-06-13 CN CN201710444159.6A patent/CN109140463B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1451140A (en) * | 1973-03-28 | 1976-09-29 | Bayer Ag | Process for the oxidation of hydrocarbons |
| CN1215696A (en) * | 1997-10-23 | 1999-05-05 | 巴陵石油化工公司鹰山石油化工厂 | Method and apparatus for incineration treatment of caprolactam saponification waste lye to recover sodium carbonate |
| CN1293223A (en) * | 1999-10-18 | 2001-05-02 | 巴陵石化鹰山石油化工厂 | Process for evaporating, concentrating and drying waste saponifying alkali solution |
| CN1354341A (en) * | 2000-11-17 | 2002-06-19 | 中国石油化工股份有限公司巴陵分公司 | Method for raising treatment capacity of saponified waste lye incinerator and its equipment |
| CN203656941U (en) * | 2013-12-31 | 2014-06-18 | 泰兴市裕廊化工有限公司 | Acrylic acid waste liquid incineration system |
| CN103822216A (en) * | 2014-03-18 | 2014-05-28 | 江苏星瑞化工工程科技有限公司 | Incineration method for saliferous organic mixed effluent |
Non-Patent Citations (1)
| Title |
|---|
| 环己烷催化氧化工序中低温分解、皂化试验及工业应用;穆志刚，陕建平，师太平;《化学工业与工程技术》;20021231;第23卷(第1期);第48-50页 * |
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