阅读说明：本技术 一种气化炉渣的资源化处理方法与利用流程 (Resourceful treatment method and utilization process of gasification furnace slag ) 是由 王俊 王超 张波 于 2021-07-30 设计创作，主要内容包括：本发明公开了一种气化炉渣的资源化处理方法与利用流程,气化炉渣的资源化处理方法,包括：将气化炉渣与生石灰按照一定的质量比混合,然后静置,实现气化炉渣的固化。将经过固化的气化炉渣与燃煤混合送入锅炉进行掺烧,可以直接回收能源减少燃料煤使用,实现气化炉渣的减量化。同时混掺物进入炉内焚烧,产生的氧化钙可以与二氧化硫发生反应,最终形成硫酸钙,起到一定的炉内脱硫作用,同时减少后续脱硫中液氨的使用。(The invention discloses a resource treatment method and a utilization process of gasification furnace slag, and the resource treatment method of the gasification furnace slag comprises the following steps: and mixing the gasification furnace slag and quick lime according to a certain mass ratio, and then standing to realize solidification of the gasification furnace slag. The solidified gasification furnace slag and the fire coal are mixed and sent into a boiler for co-combustion, so that energy can be directly recovered, the use of fuel coal is reduced, and the reduction of the gasification furnace slag is realized. Meanwhile, the mixed material enters a furnace for incineration, the generated calcium oxide can react with sulfur dioxide to finally form calcium sulfate, a certain function of in-furnace desulfurization is achieved, and the use of liquid ammonia in subsequent desulfurization is reduced.)

1. A resource treatment method of gasification slag is characterized in that the gasification slag and quicklime are uniformly stirred and mixed according to the mass ratio of 89-92:8-11 to realize the solidification of the gasification slag.

2. The method of claim 1, wherein the gasification slag and the quick lime are mixed at a mass ratio of 89: 11.

3. The method for recycling gasification slag according to claim 1, wherein the gasification slag and the quicklime are uniformly stirred and mixed according to the mass ratio of 89-92:8-11 to obtain a first mixture of the gasification slag and the calcium carbonate, so that the gasification slag is solidified.

4. The method of claim 1, wherein the gasification slag and the quick lime are mixed by a cone stacking method.

5. A resource utilization process of gasification slag is characterized in that fuel coal and a first mixture are mixed according to the mass ratio of 9-11:1 to obtain a second mixture, then the second mixture is sent into a furnace to be co-burnt, and the first mixture is obtained by the method treatment according to any one of claims 1-4.

6. A resource utilization process of gasification slag according to claim 5, wherein the gasification slag and the quick lime are stirred and mixed uniformly according to a ratio of 89:11 to obtain a first mixture of the gasification slag and the calcium carbonate.

7. A resource utilization process of gasification slag according to claim 5, wherein the fuel coal and the first mixture are uniformly stirred and mixed according to a mass ratio of 10:1 to obtain a second mixture.

8. The resource utilization process for gasification slag according to claim 5, wherein the first mixture is mixed with the fuel coal by a cone stacking method.

9. A resource utilization process of gasifier slag according to claim 5, wherein when the second mixture is fed into the furnace for co-combustion, the generated calcium oxide reacts with sulfur dioxide released by combustion in the furnace to form calcium sulfate, so that part of the sulfur dioxide formed by combustion is removed.

10. A resource utilization process of gasification slag according to any one of claims 5 to 9, wherein the gasification slag and the quick lime are uniformly stirred and mixed at a mass ratio of 89-92:8-11 to obtain a first mixture containing calcium carbonate and the gasification slag; and then mixing the first mixture and fuel coal according to a mass ratio of 9-10:1 fully mixing to obtain a second mixture; and then feeding the second mixture into a furnace for co-burning according to the original process flow.

Technical Field

The invention relates to the technical field of solid waste treatment, in particular to a resource treatment method and a utilization process of gasification furnace slag.

Background

The gasification slag is a solid residue of coal after combustion gasification in a gasification furnace, and is a product generated by a series of decomposition and combination reactions of mineral substances in the coal gasification process. The components of the gasification slag are influenced by the composition of the raw material coal, the ash content, the gasification process and other factors, and mainly comprise SiO₂、Al₂O₃CaO, carbon residue and the like, and belongs to common solid waste. The total amount of slag produced by a large coal gasification device is huge, and the management of solid waste in the coal chemical industry is relatively lagged compared with the management of waste water and waste gas at present. The gasification furnace slag is single in application at present, the effective treatment degree is not high, and the comprehensive utilization way of the furnace slag is limited, so that the large production amount of the gasification furnace slag has high transportation and landfill cost on one hand, and occupies more land for landfill on the other hand, and simultaneously has certain environmental pollution.

Based on the above, a technology for resource utilization of gasification furnace slag is sought, and reduction, resource utilization, and harmless management of waste are finally realized.

In view of this, the invention is particularly proposed.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a resource treatment method and a utilization process of gasification furnace slag.

The invention is realized by the following steps:

the invention provides a resource treatment method of gasification slag, which is characterized in that the gasification slag and quicklime are uniformly stirred and mixed according to the mass ratio of 89-92:8-11, so that the gasification slag is solidified.

The invention also provides a resource utilization process of the gasification slag, wherein the first mixture obtained by resource utilization of the fuel coal and the gasification slag is mixed according to the mass ratio of 9-11:1 to obtain a second mixture, and then the second mixture is sent into a furnace for blending combustion.

The invention has the following beneficial effects:

the invention provides a resource treatment method and a utilization process of gasification furnace slag, wherein the resource treatment method of the gasification furnace slag comprises the following steps: the gasification furnace slag and the quick lime are mixed according to a proportion, the quick lime can react to absorb water and release heat to evaporate water after standing, the gasification furnace slag is well solidified to form a loose object so as to be beneficial to recovering the heat of carbon in the gasification furnace slag, and secondly, the solidified gasification furnace slag and fire coal are mixed and sent into a furnace for co-combustion, so that energy can be directly recovered, the use of fuel coal is reduced, and the reduction of the gasification furnace slag is realized. Meanwhile, the mixed material enters a furnace for incineration, the generated calcium oxide can react with sulfur dioxide to finally form calcium sulfate, a certain function of in-furnace desulfurization is achieved, and the use of liquid ammonia in subsequent desulfurization is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is an appearance and appearance diagram of solidified gasification slag obtained by mixing gasification slag and quick lime in a mass ratio of 98:2 and standing for 6 hours in example 1 of the invention;

FIG. 2 is an appearance and appearance diagram of solidified gasification slag obtained by mixing gasification slag and quick lime in a mass ratio of 95:5 and standing for 6 hours in example 2 of the invention;

FIG. 3 is an appearance and appearance diagram of solidified gasification slag obtained by mixing gasification slag and quick lime in a mass ratio of 92:8 and standing for 6 hours in example 3 of the invention;

FIG. 4 is an appearance and appearance diagram of solidified gasification slag obtained by mixing gasification slag and quick lime in a mass ratio of 89:11 and standing for 6 hours in example 4 of the invention;

FIG. 5 is an appearance map of solidified gasification slag obtained by mixing gasification slag and quick lime in a mass ratio of 86:14 and standing for 6 hours in example 5 of the present invention;

fig. 6 is a schematic view of a flow of gasification slag utilization according to an embodiment of the present invention.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

The gasification slag is solid residue after coal is combusted and gasified in the gasification furnace, and a large amount of gas generated by combustion escapes from the coal in the gasification process, so that a gas shaft is formed in the slag, the gasification slag has a loose porous structure and a large specific surface area, and the gasification slag has the performance similar to that of activated carbon due to the existence of residual carbon, so the gasification slag has the characteristics of porous structure and high carbon content. But the water content of the slag of the gasification furnace is higher, and solid particles are finer: if the coal ash is directly dried and mixed to burn, dust can be raised, and dust harm is caused; if the coal blending agent is directly blended with coal and sent to a boiler for burning, the moisture of the blended material is too high, the belt transportation is influenced, and simultaneously, the coal blending agent is agglomerated with the coal, and the feed opening is blocked.

If the heat of carbon in the gasification slag can be effectively recovered. After recovery, the energy can be fully utilized, the energy consumption is reduced, the final solid waste can be reduced, and the reduction, the recycling and the harmlessness of the waste are realized. Therefore, a solution for resource utilization is to reduce the moisture content of the gasification slag and to solidify the gasification slag without generating a dust path. Through tests, the calcium oxide is mixed with the gasification furnace slag according to a certain proportion, so that the gasification furnace slag can be well solidified to form loose objects.

In order to achieve the above object of the present invention, the following technical solutions are adopted.

In a first aspect, an embodiment of the invention provides a resource treatment method of gasification slag, which is characterized in that gasification slag and quicklime are uniformly stirred and mixed according to a mass ratio of 89-92:8-11, so that solidification of the gasification slag is realized.

The embodiment of the invention provides a resource treatment method of gasification slag, which mixes the gasification slag and quicklime according to a certain mass ratio, and because the inventor well utilizes the characteristics of the gasification slag and the quicklime, the gasification slag has a porous structure and has the characteristics of higher carbon content and higher water content, and the quicklime can absorb water, so that the water in the gasification slag (reaction water absorption, heat release and water evaporation) can be effectively reduced, the water in the gasification slag is reduced, and the problem of higher water in the gasification slag is solved; and the quick lime absorbs water to change into mature lime, and simultaneously the hydrated lime reacts with carbon dioxide in the air to generate calcium carbonate, so that the gasification furnace slag is well solidified, the problem of flying of dust of the gasification furnace slag is solved, loose objects are formed, the mixed burning is convenient, and the method provided by the embodiment of the invention can well solve the problems of dehydration, solidification and flying of dust of the gasification furnace slag. The main chemical reactions that accompany here are:

CaO+H₂O＝Ca(OH)₂(Simultaneous exothermic), Ca (OH)₂+CO₂＝CaCO₃+H₂O。

In an alternative embodiment, the gasification slag is mixed with quicklime in a mass ratio of 89: 11.

In an alternative embodiment, the gasification slag and the quicklime are mixed in a heap mixing method.

In an optional embodiment, the gasification slag and the quicklime are uniformly stirred and mixed according to the mass ratio of 89-92:8-11 to obtain a first mixture of the gasification slag and the calcium carbonate, so that the gasification slag is solidified.

In a second aspect, an embodiment of the present invention provides a process for recycling gasification slag, where a first mixture obtained by resource treatment of fuel coal and gasification slag is mixed according to a mass ratio of 9-11:1 stirring and mixing to obtain a second mixture, and then feeding the second mixture into a furnace for co-firing.

The embodiment of the invention provides a process for recycling gasification slag, which is characterized in that the gasification slag and a final calcium oxide admixture are sent to a boiler for blending combustion, and the reason for selecting quicklime during the recycling of the gasification slag is that: the purpose of the inventor is to effectively utilize the gasification slag, not only to solidify the gasification slag, but also to recover the heat of carbon in the gasification slag, namely, the gasification slag can replace part of fire coal to be combusted, and in the combustion process, energy is directly recovered to reduce the use of the fuel coal, thereby realizing the reduction of the gasification slag. The mixed material is burnt in the furnace, the generated calcium oxide can react with sulfur dioxide to finally form calcium sulfate, a certain function of in-furnace desulfurization is achieved, and the use of liquid ammonia in subsequent desulfurization is reduced. The accompanying chemical reaction is as follows:

CaCO₃(high temperature in furnace) CaO + CO₂，CaO+SO₂＝CaSO₃，2CaSO₃+O₂＝2CaSO₄。

The solidified gasification furnace slag and the fuel coal are mixed to be burnt, so that the heat of the carbon in the gasification furnace slag is recovered, the energy is recycled, the use amount of the coal is reduced, the in-furnace desulfurization is carried out in the combustion process, the in-furnace desulfurization effect is achieved, and the use amount of liquid ammonia in the subsequent desulfurization section is reduced.

In an alternative embodiment, the gasification slag and the quicklime are mixed and stirred in a ratio of 89-92:8-11 to obtain a first mixture.

The gasification furnace slag and the quick lime are mixed according to the mass ratio of 89-92:8-11, the proportion of the quick lime is continuously increased, a large amount of agglomeration can occur, and the agglomeration is not beneficial to combustion utilization. The mixed coal is finally fed into a boiler for combustion through equipment such as a belt and the like according to the original process flow. Therefore, the standing time is generally 5 to 6 hours before the feed to the boiler.

In an alternative embodiment, the gasifier slag and the quicklime are mixed uniformly in a 89:11 ratio with stirring to obtain a first mixture of the gasifier slag and the calcium oxide.

In an alternative embodiment, the fuel coal and the first mixture are stirred and mixed uniformly according to the mass ratio of 9-11:1 to obtain a second mixture.

The method comprises the steps of uniformly stirring and mixing fuel coal and a first mixture according to the mass ratio of 9-11:1 to obtain a second mixture, mixing high-calorific-value fuel coal and low-calorific-value first mixture according to different calorific values of different fuel coals in the actual production process, and stirring and mixing uniformly according to the mass ratio of 9-10:1 to obtain the second mixture in the practical process of the invention because the boiler has requirements on the calorific value during combustion and the boiler load cannot be changed due to too low calorific value.

In an alternative embodiment, the fuel coal and the first mixture are stirred and mixed uniformly according to the mass ratio of 10:1 to obtain a second mixture.

In an alternative embodiment, the first mixture is mixed with the fuel coal using a cone stacking process.

In an alternative embodiment, the calcium oxide reacts with sulfur dioxide released from combustion in the furnace to form calcium sulfate when the second mixture is fed into the furnace for co-firing, such that a portion of the sulfur dioxide formed from the combustion is removed.

In an optional embodiment, the gasification slag and the quicklime are uniformly stirred and mixed according to the mass ratio of 89-92:8-11 to obtain a first mixture containing calcium carbonate and the gasification slag; then, fully mixing the fuel coal and the first mixture according to the mass ratio of 9-10:1 to obtain a second mixture; and then feeding the second mixture into a furnace for co-burning according to the original process flow.

The features and properties of the present invention are described in further detail below with reference to examples.

In the following examples of the present invention, the raw material sources, components, preparation and experimental methods were the same as those of the comparative examples.

Properties of the gasification slag:

the gasification furnace slag is black mud, has high water content and fine solid matter particles, and is analyzed for water content, heat productivity, carbon content and the like, and the analysis data are shown in the following table 1:

TABLE 1

The method for resource utilization of the gasification furnace slag comprises the following steps:

the gasification furnace slag and the quicklime are mixed according to a certain proportion, and the solidification of the gasification furnace slag is realized through standing. Examples 1 to 5 below were prepared by blending the gasification furnace slag and calcium oxide, and the analytical data of blending were as follows.

TABLE 2

As can be seen from table 2 above, since the fuel coal has a high calorific value and the doped quicklime has no calorific value, as the blending ratio of the calcium oxide doped in the gasification slag increases, the low-level calorific value of the mixture decreases, the gasification slag gradually approaches the granular state, and the solidification of the boiler slag is realized without generating dust.

In the above examples 1-5 of the present invention, the overall state of slag mixture is examined, wherein the mass ratio of the slag mixture to the calcium oxide is in the range of 86-98:2-14, the overall state of slag mixture is shown in fig. 1-5, the ratio of the slag mixture to the calcium oxide is 98:2 in example 1, the moisture in the slag mixture is not fully absorbed, the overall slag mixture is in a slurry state, the slag mixture is not easy to be mixed and combusted with fuel coal, the ratio of quicklime is further increased, the moisture in the slag mixture is gradually reduced to dry particles, the slag mixture is just fixed, no much moisture and no large lumps exist, the state is similar to the fuel coal, the slag mixture is easy to be uniformly mixed and combusted with the fuel coal, the ratio of the calcium oxide is further increased as in example 5, the slag agglomerates are serious, the lumps of the slag mixture are not easy to be subsequently mixed with the fuel coal, the uneven mixing is not favorable for combustion.

Example 6

The process of resource utilization of the solidified gasification slag is as follows, see fig. 6:

the gasification furnace slag is sent to a temporary storage warehouse (the temporary storage warehouse is arranged in a fuel coal bunker), and the gasification furnace slag and the quick lime are mixed by a mixer according to the ratio of 89:11, and standing to obtain a first mixture of calcium carbonate and gasification slag (the appearance of the first mixture is shown in fig. 4). And (2) fully mixing the first mixture and the fuel coal according to a proportion by a coal slag mixer (mixing by adopting a cone stacking method), wherein the mixing proportion of the fuel coal and the mixed gasification furnace slag is 10:1 to obtain a second mixture. The second mixture, namely the mixed coal, is finally fed into a boiler for combustion through a belt, other conveying equipment and the like according to the original process flow.

According to the actual condition of boiler operation (about 120 ten thousand tons of coal is used for the boiler every year, and the blending test is carried out according to the blending of 1 ten thousand tons of blending materials every month), the blending test is carried out on the mixture of the gasification furnace slag and the calcium oxide and the coal according to the ratio of 1:10, and the boiler operation is not influenced after the blending test. Meanwhile, the data of the flue gas without blended combustion and the data of the flue gas with blended combustion are compared, and the blended combustion materials can play a role in desulfurization in the furnace. Specific smoke data are shown in table 3 below:

TABLE 3

Serial number	Item	Air-dried basis sulfur Std%	Remarks for note
				1	Sulfur content before blended firing	1.02
2	Sulfur content before blended firing	0.95

The sulfur content before blending combustion in table 3 above is taken as fuel coal to be combusted, the sulfur content in the flue gas released by combustion is measured to be 1.02 Std%, the fuel coal is mixed with the solidified gasification furnace slag to obtain mixed coal to be combusted, and the sulfur content in the flue gas released by combustion is measured to be 0.95 Std%.

Furthermore, through calculation, the slag landfill amount can be reduced by 12 ten thousand tons each year by blending and burning according to the proportion, and meanwhile, the transportation cost, the landfill cost and the like are reduced.

To sum up, the embodiment of the invention provides a resource treatment method and a utilization process of gasification furnace slag, wherein the treatment method comprises the following steps: the method comprises the steps of mixing the gasification furnace slag and quick lime according to a mass ratio, standing, solidifying the gasification furnace slag, solving the problem of dust emission by the solidified gasification furnace slag, mixing the solidified gasification furnace slag and coal, sending the mixture into a boiler for co-combustion, directly recovering energy, reducing the use amount of fuel coal, and reducing the quantity of the gasification furnace slag. Meanwhile, the mixed material enters a furnace for incineration, the generated calcium oxide can react with sulfur dioxide to finally form calcium sulfate, a certain function of in-furnace desulfurization is achieved, and the use of liquid ammonia in subsequent desulfurization is reduced.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.