阅读说明：本技术 一种阻焦剂及其制备方法和用途 (Coke inhibitor and preparation method and application thereof ) 是由 陈艳 丁勇 徐春生 熊义根 张小明 严心富 佟沐春 于 2020-06-05 设计创作，主要内容包括：本发明公开一种阻焦剂及其制备方法和用途。阻焦剂由重量比为40～50∶10～20∶15～20∶10～20的碳酸钙、氧化铝、氢氧化钙和二氧化硅组成。危废物料成分复杂,含有氟、氯、硫、磷以及金属元素等,容易在高温焚烧条件下形成酸性氛围,从而形成低熔点盐类。有机物燃尽的熔融物料与高熔点阻焦剂结合后,阻焦剂将熔融物料包裹,且阻焦剂与低熔点物料螯合或者结晶的方式提高物料的熔点,同时与熔融物料形成夹心层及疏松结构,从而有效抑制大的焦块的形成。制备方法包括将上述各个组分按照比例通过常压反应釜搅拌混合。阻焦剂应用于回转窑焚烧处置危险废物过程中,可有效抑制窑内物料结焦、结圈等,从而延长回转窑焚烧处置周期。(The invention discloses a coke inhibitor and a preparation method and application thereof. The anti-coking agent consists of calcium carbonate, aluminum oxide, calcium hydroxide and silicon dioxide in a weight ratio of 40-50: 10-20: 15-20: 10-20. The hazardous waste material has complex components, contains fluorine, chlorine, sulfur, phosphorus, metal elements and the like, and is easy to form an acid atmosphere under the high-temperature incineration condition, thereby forming low-melting-point salts. After the melted materials burnt out by the organic matters are combined with the high-melting-point coke inhibitor, the molten materials are wrapped by the coke inhibitor, the melting point of the materials is improved in a manner that the coke inhibitor is chelated with the low-melting-point materials or crystallized, and meanwhile, a sandwich layer and a loose structure are formed with the melted materials, so that the formation of large coke blocks is effectively inhibited. The preparation method comprises the steps of stirring and mixing the components in proportion through a normal pressure reaction kettle. The coke inhibitor is applied to the process of burning and disposing hazardous wastes in the rotary kiln, and can effectively inhibit the materials in the kiln from coking, ring formation and the like, thereby prolonging the burning and disposing period of the rotary kiln.)

1. A coke inhibitor comprises calcium carbonate, aluminum oxide, calcium hydroxide and silicon dioxide in a weight ratio of 40-50: 10-20: 15-20: 10-20.

2. The coke inhibitor of claim 1 wherein the weight ratio of calcium carbonate, alumina, calcium hydroxide and silica is 45: 15: 20.

3. A method of producing the scorch inhibitor of any of claims 1-2, comprising the steps of: stirring and mixing calcium carbonate, aluminum oxide, calcium hydroxide and silicon dioxide in a weight ratio of 40-50: 10-20: 15-20: 10-20 by using a normal-pressure reaction kettle to prepare the coke inhibitor.

4. The coke inhibitor according to any one of claims 1 to 2 is applied to a rotary kiln for hazardous waste incineration.

5. The use according to claim 4, wherein the coke inhibitor is mixed with the hazardous waste material and stirred uniformly, and then is injected into the hazardous waste incineration rotary kiln for incineration treatment by means of an injection device of the hazardous waste incineration rotary kiln, the incineration temperature is 600-1100 ℃, and the injection amount of the coke inhibitor is 0.5-2% of the amount of the hazardous waste material.

Technical Field

The invention relates to the technical field of hazardous waste incineration treatment processes, in particular to a coking inhibitor for inhibiting coking in a hazardous waste incineration rotary kiln during hazardous waste material incineration, and also relates to a preparation method and application of the coking inhibitor.

Background

At present, incineration disposal is still a main way and means for disposing hazardous waste materials, most hazardous waste materials can be subjected to capacity reduction treatment through incineration, but coking problems can be caused when industrial hazardous waste is treated by using a rotary kiln. In any type of coking, the formation principle is generated when the industrial hazardous waste is incinerated, specifically, the hazardous waste is decomposed under high temperature, and the generated elements are recombined together to finally form some low-melting-point salt substances. The low-melting-point salts pass through different temperature intervals in the rotary kiln, and are easy to cause coking and wall hanging after high temperature and medium and low temperature changes. The coking of the incineration kiln needs to be stopped and overhauled, the disposal of hazardous waste materials is influenced, the revenue and profit of hazardous waste disposal enterprises are seriously influenced, the cost of the overhauling process is high, and a large amount of fund waste is also caused. The incineration kiln, particularly the coking at the tail of the kiln, is an industrial problem, and no better solution exists at present.

At present, researchers at home and abroad begin to pay attention to the problem of coking in a kiln in the incineration process and research the coking mechanism. But no effective solution exists, the treatment is generally carried out by reducing the compatibility of low-melting-point materials and increasing the temperature of a coking position, and the treatment effect is not ideal.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a coke inhibitor capable of effectively inhibiting coke body formation during the incineration of dangerous waste materials, and a preparation method and application of the coke inhibitor.

Therefore, the invention provides a coke inhibitor which comprises calcium carbonate, aluminum oxide, calcium hydroxide and silicon dioxide in a weight ratio of 40-50: 10-20: 15-20: 10-20.

The hazardous waste material is complex in component, contains fluorine, chlorine, sulfur, phosphorus, metal elements and the like, and is easy to form an acid atmosphere under a high-temperature incineration condition, so that low-melting-point salts are formed, after the organic matter burnt-out molten material is combined with the high-melting-point coke inhibitor, the molten material is wrapped by the coke inhibitor, the melting point of the material is improved in a manner that the coke inhibitor is chelated with the low-melting-point material or crystallized, and a sandwich layer and a loose structure are formed with the molten material, so that the formation of large coke blocks is effectively inhibited.

As a preferable embodiment of the coke inhibitor of the present invention, the weight ratio of calcium carbonate, alumina, calcium hydroxide and silica is 45: 15: 20.

The invention also provides a method for preparing the coke inhibitor, which comprises the following steps:

stirring and mixing calcium carbonate, aluminum oxide, calcium hydroxide and silicon dioxide in a weight ratio of 40-50: 10-20: 15-20: 10-20 by using a normal-pressure reaction kettle to prepare the coke inhibitor.

The invention also provides an application of the coke inhibitor in the hazardous waste incineration rotary kiln for inhibiting the incineration coking of the hazardous waste material.

As a preferred scheme of the application of the coke inhibitor in the hazardous waste incineration rotary kiln for treating the hazardous waste materials, the coke inhibitor and the hazardous waste materials are mixed and uniformly stirred, and then the mixture is sprayed into the hazardous waste incineration rotary kiln for incineration treatment by means of a spraying device of the hazardous waste incineration rotary kiln, wherein the incineration temperature is 600-1100 ℃, and the spraying amount of the coke inhibitor is 0.5-2% of the amount of the hazardous waste materials.

When the incineration materials are melted at high temperature and then enter the kiln tail of the middle-low temperature hazardous waste incineration rotary kiln, after the melted materials burnt out by organic matters are combined with the high-melting-point coke inhibitor, the molten materials are wrapped by the coke inhibitor, and the melting point of the materials is improved in a manner that the coke inhibitor is chelated with the low-melting-point materials or crystallized, so that a sandwich layer and a loose structure are formed with the melted materials, and the formation of large coke blocks is effectively inhibited. And the molten material is easy to fall off from the kiln tail by matching with related burning operation or manual cleaning mode, so that coking is prevented, and the operation period of the dangerous waste burning rotary kiln is greatly prolonged.

Detailed Description

The technical contents, the structural features, the achieved objects and the effects of the invention are explained in detail in the following with reference to the embodiments. The following examples are intended only to illustrate the invention in detail and are not intended to limit the scope of the invention in any way.