阅读说明：本技术 一种垃圾焚烧发电厂高温烟气中二恶英的处理系统 (System for treating dioxin in high-temperature flue gas of waste incineration power plant ) 是由 林獻山 于 2021-09-03 设计创作，主要内容包括：本发明公开了一种垃圾焚烧发电厂高温烟气中二恶英的处理系统,它包括以下处理工艺：工艺1：废弃金属氧化物的制备,废弃金属氧化物是由工业集尘灰经由粉碎、过筛、磁选、比重分离等处理方法制备所得。有益效果在于：本发明通过将废弃金属氧化物进行加工利用制成能够抑制二恶英产生的高机能复合材料,并且在垃圾焚烧过程中持续添加该高机能复合材料,一方面实现了废弃物的循环利用,提高了资源的利用率,另一方面能够有效抑制垃圾焚烧过程中二恶英的产生,并提高垃圾焚烧的燃烧温度,从而提高垃圾发电厂的发电量,经济实用。(The invention discloses a system for treating dioxin in high-temperature flue gas of a waste incineration power plant, which comprises the following treatment processes: the process 1 comprises the following steps: the preparation of the waste metal oxide, the waste metal oxide is prepared by the treatment methods of crushing, sieving, magnetic separation, specific gravity separation and the like of industrial dust-collecting ash. Has the advantages that: according to the invention, the waste metal oxide is processed and utilized to prepare the high-performance composite material capable of inhibiting the generation of dioxin, and the high-performance composite material is continuously added in the waste incineration process, so that on one hand, the cyclic utilization of waste is realized, the utilization rate of resources is improved, on the other hand, the generation of dioxin in the waste incineration process can be effectively inhibited, and the combustion temperature of waste incineration is improved, so that the generated energy of a waste power plant is improved, and the method is economical and practical.)

1. The utility model provides a processing system of dioxin in waste incineration power plant high temperature flue gas which characterized in that: the method comprises the following treatment processes:

the process 1 comprises the following steps: preparation of waste metal oxides

The waste metal oxide is prepared by industrial dust-collecting ash through the processing methods of crushing, sieving, magnetic separation, specific gravity separation and the like, substances with different specific gravities are separated by a specific gravity difference classifier, the objects are supplied to an air table from a feeder, and the objects are separated by the vibration motion and the air flow of the table; generally, heavy objects are not easily affected by air flow and fall to one side by being conveyed by a vibrating motion, on the other hand, light objects float by being strongly affected by air flow to reduce friction with the surface of the table, slide down the slope of the table and then fall to the other side, and in addition, the lightest objects are blown up by air flow and collected by a dust collector; separating the heavy specific gravity matter P1 into magnetic sediment P2 and non-magnetic sediment P3 by using a magnetic separator, wherein the magnetic separator is a device for separating magnetic metals such as magnetic iron by magnetic adsorption, and the crushed heavy specific gravity matter P1 contains metal chips with tens to hundreds of millimeters so as to recover iron oxide and other matters of the magnetic sediment;

and (2) a process: removing impurities and screening

Removing impurities from the prepared metal oxide, and sieving the metal oxide subjected to impurity removal through a 100-mesh sieve for later use;

and (3) a process: preparation of auxiliary materials

Respectively preparing a certain amount of Monte clay, natural zeolite and diatomite for later use;

and (4) a process: nano-processing

Uniformly mixing the screened metal oxide with Montana, natural zeolite and diatomite, and carrying out nano-treatment on the material for 30-90 minutes by using a hydrothermal synthesis method under the hydrothermal conditions of 70-90MPa and 350-450 ℃ so as to prepare a high-function composite material capable of inhibiting dioxin generated by waste incineration;

and (5) a process: suppression of dioxin produced by incineration of refuse

The powdery high-performance composite material is added into a combustion chamber of a continuously-operated waste incineration power plant at the temperature of 700-750 ℃, so that the generation of dioxin in the waste incineration process can be effectively inhibited.

2. The system for treating dioxin in high-temperature flue gas of a waste incineration power plant according to claim 1, characterized in that: the content of monttany in the process 4 is 0.02% or less, preferably 0.01% or less, and more preferably 0.005% or less.

3. The system for treating dioxin in high-temperature flue gas of a waste incineration power plant according to claim 1, characterized in that: the content of the natural zeolite in the process 4 is 0.6% or less, preferably 0.3% or less, and more preferably 0.1% or less.

4. The system for treating dioxin in high-temperature flue gas of a waste incineration power plant according to claim 1, characterized in that: the diatomaceous earth content in the above process 4 is 0.5% or less, preferably 0.3% or less, and more preferably 0.2% or less.

5. The system for treating dioxin in high-temperature flue gas of a waste incineration power plant according to claim 1, characterized in that: the high-functional composite material in the process 5 is added in a flow transfer mode and needs to be continuously added in the whole waste incineration process.

6. The system for treating dioxin in high-temperature flue gas of a waste incineration power plant according to claim 1, characterized in that: the addition amount of the high-function composite material in the process 5 is 0.1-2.5%, preferably 0.2-2.0%, and preferably 0.2-2.0% of the weight of the combustion garbage in unit time.

Technical Field

The invention relates to the technical field of treatment of dioxin in high-temperature flue gas of a waste incineration power plant, in particular to a treatment system for the dioxin in the high-temperature flue gas of the waste incineration power plant.

Background

In 1985, the first waste power plant in China is constructed in Shenzhen, the daily processing capacity of the waste power plant is only 300 tons, the waste incineration power generation industry in China is developed at a high speed until 2000 under the urging of national policies and market demands, according to the data of the national statistical office, the newly increased capacity of the waste power generation in China in 2012 and 2016 is about 3.2 ten thousand tons/day, and the total quantity of the municipal domestic waste incineration capacity in China reaches 29.8 ten thousand tons/day in 2017; the municipal solid waste incineration treatment capacity of China is about 10000 million tons in 2018 all the year round, the average daily treatment capacity is about 38 million tons, 2019 is the most year of the construction of the waste incineration power generation project of China, 600 large, medium and small-sized domestic waste incineration power generation projects are proposed in China, the waste incineration capacity of China reaches 60 million tons/day and the annual treatment total amount is about 2 hundred million tons in 2020, the installed capacity of the waste power generation reaches 1200 million kilowatts, active carbon is added in front of the waste gas emission outlet in most waste incineration power generation at present, but the emission of dioxin does not reach the standard in a sampling test and reaches the standard in a fixed inspection, even if part of incineration plants can reach the dioxin emission standard, the used active carbon contains dioxin, the subsequent waste treatment is a serious problem, and the dioxin is an environmental toxicant of Persistent Organic Pollutants (POPS), and has strong toxicity, once inside the body, which may cause reproductive and developmental problems, immune system impairment, hormonal disturbances, and even cancer, it has been known for a long time to be stored in the body because of its chemical stability, generally in vivo half-life estimated to be 7 to 11 years, and dioxin has a total of 210 different compounds including 75 Polychlorinated dibenzodioxins (PCDDs), 135 Polychlorinated dibenzofurans (PCDFs). There are five major sources of dioxin, such as natural generation, waste incineration, other man-made burnout activities, industrial raw material by-products, and combustion activities in specific industrial processes.

Dioxins tend to accumulate in the environmental food chain, with animals and humans located at the high end of the food chain, and the higher the food chain the higher the concentration of dioxins. Although dioxin is mainly present in municipal refuse, industrial waste or medical waste containing chlorine polymers, in the incineration process, dioxin generated by the incineration of the refuse or waste can be decomposed under high-temperature operation, partial dioxin residues can also be present, or dioxin which is originally decomposed in the cooling process is polymerized to form dioxin.

Disclosure of Invention

The invention aims to solve the problems and provide a system for treating dioxin in high-temperature flue gas of a waste incineration power plant.

The invention realizes the purpose through the following technical scheme:

a system for treating dioxin in high-temperature flue gas of a waste incineration power plant comprises the following treatment processes:

the process 1 comprises the following steps: preparation of waste metal oxides

The waste metal oxide is prepared by industrial dust-collecting ash through the processing methods of crushing, sieving, magnetic separation, specific gravity separation and the like, substances with different specific gravities are separated by a specific gravity difference classifier, the objects are supplied to an air table from a feeder, and the objects are separated by the vibration motion and the air flow of the table; generally, heavy objects are not easily affected by air flow and fall to one side by being conveyed by a vibrating motion, on the other hand, light objects float by being strongly affected by air flow to reduce friction with the surface of the table, slide down the slope of the table and then fall to the other side, and in addition, the lightest objects are blown up by air flow and collected by a dust collector; separating the heavy specific gravity matter P1 into magnetic sediment P2 and non-magnetic sediment P3 by using a magnetic separator, wherein the magnetic separator is a device for separating magnetic metals such as magnetic iron by magnetic adsorption, and the crushed heavy specific gravity matter P1 contains metal chips with tens to hundreds of millimeters so as to recover iron oxide and other matters of the magnetic sediment;

and (2) a process: removing impurities and screening

Removing impurities from the prepared metal oxide, and sieving the metal oxide subjected to impurity removal through a 100-mesh sieve for later use;

and (3) a process: preparation of auxiliary materials

Respectively preparing a certain amount of Monte clay, natural zeolite and diatomite for later use;

and (4) a process: nano-processing

Uniformly mixing the screened metal oxide with Montana, natural zeolite and diatomite, and carrying out nano-treatment on the material for 30-90 minutes by using a hydrothermal synthesis method under the hydrothermal conditions of 70-90MPa and 350-450 ℃ so as to prepare a high-function composite material capable of inhibiting dioxin generated by waste incineration;

and (5) a process: suppression of dioxin produced by incineration of refuse

The powdery high-performance composite material is added into a combustion chamber of a continuously-operated waste incineration power plant at the temperature of 700-750 ℃, so that the generation of dioxin in the waste incineration process can be effectively inhibited.

Further, the monttany content in the process 4 is 0.02% or less, preferably 0.01% or less, and more preferably 0.005% or less.

Further, the content of the natural zeolite in the process 4 is 0.6% or less, preferably 0.3% or less, and more preferably 0.1% or less.

Further, the content of diatomaceous earth in the above process 4 is 0.5% or less, preferably 0.3% or less, and more preferably 0.2% or less.

Further, the mode of adding the high-performance composite material in the process 5 is a flow transfer type, and the high-performance composite material needs to be continuously added in the whole waste incineration process, and during starting and starting, the high-performance composite material operates in a temperature range between room temperature and the temperature of the incinerator during stable operation, in the temperature range, incomplete combustion is easy to occur in a combustion chamber, dioxin is most easily generated, and because the generated dioxin and precursors of the dioxin remain in a flue and a dust remover as they are, the high-performance composite material for inhibiting the dioxin is added in the whole operation time from the operation start to the operation end.

Further, in the process 5, the amount of the high functional composite material added is 0.1 to 2.5%, preferably 0.2 to 2.0% by weight of the combustion waste per unit time, and if less than 0.1%, a sufficient effect of inhibiting the generation of dioxin cannot be obtained.

Further, in the present invention, in the cooling process from the combustion chamber to the dust collector, an iron compound catalyst for inhibiting dioxin is added to the exhaust gas to be attached to the flue, and is left in the dust collector together with the combustion gas and fly ash, so that the generation of dioxin in the cooling process from the combustion chamber to the dust collector can be inhibited, and furthermore, the generation of dioxin due to memory effect generated at the flue, the dust collector, etc. at the time of low-temperature combustion at the start of the incinerator and at the time of intermittent start can be inhibited.

The invention has the beneficial effects that:

according to the invention, the waste metal oxide is processed and utilized to prepare the high-performance composite material capable of inhibiting the generation of dioxin, and the high-performance composite material is continuously added in the waste incineration process, so that on one hand, the cyclic utilization of waste is realized, the utilization rate of resources is improved, on the other hand, the generation of dioxin in the waste incineration process can be effectively inhibited, and the combustion temperature of waste incineration is improved, so that the generated energy of a waste power plant is improved, and the method is economical and practical.

Drawings

FIG. 1 is a schematic diagram of a system for treating dioxin in high-temperature flue gas of a waste incineration power plant according to the present invention;

FIG. 2 is a process flow diagram of the waste metal oxide in the treatment system of dioxin in high-temperature flue gas of a waste incineration power plant according to the invention.

Detailed Description

A system for treating dioxin in high-temperature flue gas of a waste incineration power plant comprises the following treatment processes:

the process 1 comprises the following steps: preparation of waste metal oxides

The waste metal oxide is prepared by industrial dust-collecting ash through the processing methods of crushing, sieving, magnetic separation, specific gravity separation and the like, substances with different specific gravities are separated by a specific gravity difference classifier, the objects are supplied to an air table from a feeder, and the objects are separated by the vibration motion and the air flow of the table; generally, heavy objects are not easily affected by air flow and fall to one side by being conveyed by a vibrating motion, on the other hand, light objects float by being strongly affected by air flow to reduce friction with the surface of the table, slide down the slope of the table and then fall to the other side, and in addition, the lightest objects are blown up by air flow and collected by a dust collector; separating the heavy specific gravity matter P1 into magnetic sediment P2 and non-magnetic sediment P3 by using a magnetic separator, wherein the magnetic separator is a device for separating magnetic metals such as magnetic iron by magnetic adsorption, and the crushed heavy specific gravity matter P1 contains metal chips with tens to hundreds of millimeters so as to recover iron oxide and other matters of the magnetic sediment;

and (2) a process: removing impurities and screening

Removing impurities from the prepared metal oxide, and sieving the metal oxide subjected to impurity removal through a 100-mesh sieve for later use;

and (3) a process: preparation of auxiliary materials

Respectively preparing a certain amount of Monte clay, natural zeolite and diatomite for later use;

and (4) a process: nano-processing

Uniformly mixing the screened metal oxide with Montana, natural zeolite and diatomite, and carrying out nano-treatment on the material for 30-90 minutes by using a hydrothermal synthesis method under the hydrothermal conditions of 70-90MPa and 350-450 ℃ so as to prepare a high-function composite material capable of inhibiting dioxin generated by waste incineration;

and (5) a process: suppression of dioxin produced by incineration of refuse

The powdery high-performance composite material is added into a combustion chamber of a continuously-operated waste incineration power plant at the temperature of 700-750 ℃, so that the generation of dioxin in the waste incineration process can be effectively inhibited.

In this example, the monttana content in the process 4 is 0.02% or less, preferably 0.01% or less, and more preferably 0.005% or less.

In this example, the content of the natural zeolite in the process 4 is 0.6% or less, preferably 0.3% or less, and more preferably 0.1% or less.

In this example, the content of diatomaceous earth in the process 4 is 0.5% or less, preferably 0.3% or less, and more preferably 0.2% or less.

In this embodiment, the high-performance composite material in the process 5 is added in a flow transfer type, and needs to be continuously added in the whole waste incineration process, and during start-up and start-up, the high-performance composite material operates in a temperature range between room temperature and the temperature of the incinerator during stable operation, in this temperature range, incomplete combustion is likely to occur in the combustion chamber, and dioxin is most likely to be generated.

In this embodiment, the amount of the high-functional composite material added in the process 5 is 0.1 to 2.5%, preferably 0.2 to 2.0% by weight of the combustion waste per unit time, and if less than 0.1%, a sufficient effect of inhibiting the generation of dioxin cannot be obtained.

In this embodiment, in the cooling process from the combustion chamber to the dust collector, the present invention adds an iron compound catalyst for dioxin suppression to the exhaust gas, and makes it adhere to the flue, and leaves it in the dust collector together with the combustion gas and fly ash, so that the generation of dioxin in the cooling process from the combustion chamber to the dust collector can be suppressed, and furthermore, the generation of dioxin due to low-temperature combustion at the start of the incinerator and the memory effect generated at the flue, the dust collector, etc. at the intermittent start can be suppressed.

Test detection

Detecting dioxin in the treated waste incineration boiler flue gas under the multitask condition, wherein the detection results are shown in the following tables 1 and 2;

TABLE 1 dioxin at economizer under different operating conditions

From Table 1, it can be seen that under normal conditions, the dioxin concentration is 1.1ng-TEQ/Nm3, the dioxin concentration without active carbon is 1.4ng-TEQ/Nm3, and the dioxin concentration-inhibiting dioxin concentration is 0.65ng-TEQ/Nm 3. from the mathematical point of view, the effect of reducing the dioxin concentration by 41% -53.5% after the dioxin inhibitor, namely the high-energy composite material, is added can be seen;

TABLE 2 flue gas device dioxins under different working conditions

As can be seen from Table 2, the amounts of dioxin and dioxin were 0.039ng-TEQ/Nm3, 0.018ng-TEQ/Nm3 without addition of active carbon, and 0.022ng-TEQ/Nm3 with addition of dioxin to suppress dioxin, all of which were 0.1ng-TEQ/Nm3 below the regulatory values, but the effect of adding a dioxin inhibitor was not judged, and in particular, dioxin in the case of activated carbon was lower than that in the case of normal operation, and thus activated carbon was not necessarily used;

summary of the effects

The concentrations of dioxin inhibitors detected on the first day under the conventional conditions were 1.1ng-TEQ/Nm3 respectively, the next day without activated carbon was 1.4ng-TEQ/Nm3, on the last day of inhibitor addition, 0.65ng-TEQ/Nm3, respectively, is observed mathematically that, after addition of dioxin inhibitor, the dioxin concentration is reduced by 41 to 53.5 percent, and after the bag filter is used, the smoke emission concentration detection value in the three days is lower than 0.1ng-TEQ/Nm3, after the bag filter is used in the last day, the concentrations of 17 representative dioxin species were studied and the experimental data showed that the concentration of 2,3,4,7,8-P5CDF was higher than other congeners and the same results showed that the sum of all homolog concentrations was still below the emission standard. Unburned carbon can generate the Denovo effect at low temperature, so the high-energy composite material inhibitor has the function of improving the combustion temperature, can reduce the unburned carbon amount and reduce the dioxin concentration.

The experiment analyzes important measures for adding the dioxin inhibitor to the PCDD/Fs, two suggestions are summarized according to actual operation conditions, the first suggestion is that the dioxin inhibitor is added to inhibit the generation of the dioxin and extra information related to the dioxin inhibition is obtained, if the activated carbon can be replaced by the inhibitor, the influence caused by solidification and refuse landfill can be reduced, and the second suggestion needs to detect the concentration of the dioxin and analyze the chemical structures of the fly ash and bottom ash so as to reasonably add the dioxin.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.