阅读说明：本技术 一种高硫煤高温气化后的除渣方法 (Deslagging method for high-sulfur coal after high-temperature gasification ) 是由 胡贤贤 刘文林 郭志鹏 韩世良 崔山山 杨璐 于 2020-06-08 设计创作，主要内容包括：本发明公开了一种高硫煤高温气化后的除渣方法,属于除渣技术领域。其包括如下步骤：高硫煤高温气化后得到的熔融状的炉渣和灰份,进入灰渣激冷罐,分解成灰渣小颗粒,再流入到渣收集罐中,分别得到渣和灰水；将灰水从渣收集罐抽出,再经过水力旋流器和循环灰水冷却器,返回到灰渣激冷罐；待渣全部进入渣放料罐,将渣放料罐与渣收集罐隔绝并卸压,然后将渣全部排入炉渣脱水仓；炉渣脱水仓中的灰水进入澄清槽中,炉渣脱水仓中的渣进入中间渣场；向渣放料罐中通入循环水,进行冲洗和重新注水,然后加压,再与渣收集罐重新连通。本发明的高硫煤高温气化后的除渣方法,具有除渣效率高、出渣效果好、操作简便、能耗低、处理成本低和环境污染小等优点。(The invention discloses a deslagging method of high-sulfur coal after high-temperature gasification, belonging to the technical field of deslagging. Which comprises the following steps: molten slag and ash obtained after high-temperature gasification of high-sulfur coal enter an ash quenching tank, are decomposed into small ash particles, and then flow into a slag collecting tank to respectively obtain slag and ash water; pumping the ash water from the slag collecting tank, and returning the ash water to the ash slag quenching tank through a hydrocyclone and a circulating ash water cooler; after all the slag enters the slag discharging tank, isolating the slag discharging tank from the slag collecting tank and releasing the pressure, and then discharging all the slag into a slag dewatering bin; ash water in the slag dewatering bin enters a clarifying tank, and slag in the slag dewatering bin enters an intermediate slag field; and circulating water is introduced into the slag discharging tank for flushing and water re-injection, then pressurization is carried out, and the slag discharging tank is communicated with the slag collecting tank again. The deslagging method after high-temperature gasification of the high-sulfur coal has the advantages of high deslagging efficiency, good deslagging effect, simplicity and convenience in operation, low energy consumption, low treatment cost, small environmental pollution and the like.)

1. A deslagging method after high-temperature gasification of high-sulfur coal is characterized by comprising the following steps:

step 1: the molten slag and ash obtained after the high-sulfur coal is gasified at high temperature enter an ash quenching tank at the bottom of the gasification furnace, are quenched when meeting water, are decomposed into small ash particles, and then flow into a slag collecting tank to respectively obtain slag and ash water;

step 2: pumping the grey water obtained in the step (1), sequentially passing through a hydrocyclone and a circulating grey water cooler, and returning to the ash quenching tank;

and step 3: when all the slag obtained in the step (1) enters a slag discharging tank, isolating the slag discharging tank from a slag collecting tank and starting pressure relief, and then, discharging all the slag into a slag dewatering bin; the grey water in the slag dewatering bin enters a clarifying tank, and the slag in the slag dewatering bin enters an intermediate slag field;

and 4, step 4: and circulating water is introduced into the slag discharging tank for flushing and reinjecting water, and then the slag discharging tank is pressurized and then is communicated with the slag collecting tank again.

2. The method for removing the slag after the high-temperature gasification of the high-sulfur coal according to claim 1, wherein a slag breaker is further provided between the slag quenching tank and the collection tank in step 1.

3. The method for removing slag after high-temperature gasification of high-sulfur coal according to claim 1, wherein in step 2, the grey water is pumped out from the top of the slag collecting tank by a circulating pump.

4. The method for removing the slag after the high-temperature gasification of the high-sulfur coal according to claim 1, wherein in the step 3, the grey water in the slag dewatering bin enters a clarifying tank through a slag water discharging pump; and the slag in the slag dewatering bin is fished out by a slag dragging machine and enters the intermediate slag field through a slag conveying belt conveyor.

5. The method for removing the slag after the high-temperature gasification of the high-sulfur coal according to any one of claims 1 to 4, wherein in the step 4, the circulating water is from an internal circulating water buffer tank and has a temperature of 40 ℃.

6. The method for removing slag after high-temperature gasification of high-sulfur coal according to any one of claims 1 to 4, wherein in the step 4, the pressurization is performed to 4.5MPa by using high-pressure nitrogen.

Technical Field

The invention relates to a deslagging method of high-sulfur coal after high-temperature gasification, belonging to the technical field of deslagging.

Background

Currently, coal and oil remain the two major energy sources worldwide. Coal is an important fossil fuel and chemical raw material in China and plays an important role in national economic development, however, the content of sulfur in coal in China is generally high, and the sulfur content also tends to increase along with the increase of coal seam mining depth. The high-sulfur coal resources in China are rich, and 7.80% of coal mines and key coal mines distributed in China are all high-sulfur coal, which is an important coal resource. As SO is generated in the using process of the high-sulfur coal₂And the high-sulfur coal is used after being desulfurized, and the desulfurization cost of the high-sulfur coal is higher, so the high-sulfur coal is always a low-quality coal.

After high-temperature gasification of high-sulfur coal, molten slag and ash with the temperature as high as 1600 ℃ are generated. These slags and ashes, if left untreated, not only cause a great environmental pollution, but also increase the production costs. In view of this, it is necessary to provide a method for removing slag after high-temperature gasification of high-sulfur coal, so as to solve the defects of the prior art.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a deslagging method for high-sulfur coal after high-temperature gasification. The deslagging method after high-temperature gasification of the high-sulfur coal has the advantages of high deslagging efficiency, good deslagging effect, simplicity and convenience in operation, low energy consumption, low treatment cost, small environmental pollution and the like.

The technical scheme for solving the technical problems is as follows: a deslagging method after high-temperature gasification of high-sulfur coal comprises the following steps:

step 1: the molten slag and ash obtained after the high-sulfur coal is gasified at high temperature enter an ash quenching tank at the bottom of the gasification furnace, are quenched when meeting water, are decomposed into small ash particles, and then flow into a slag collecting tank to respectively obtain slag and ash water;

step 2: pumping the grey water obtained in the step (1), sequentially passing through a hydrocyclone and a circulating grey water cooler, and returning to the ash quenching tank;

and step 3: when all the slag obtained in the step (1) enters a slag discharging tank, isolating the slag discharging tank from a slag collecting tank and starting pressure relief, and then, discharging all the slag into a slag dewatering bin; the grey water in the slag dewatering bin enters a clarifying tank, and the slag in the slag dewatering bin enters an intermediate slag field;

and 4, step 4: and circulating water is introduced into the slag discharging tank for flushing and reinjecting water, and then the slag discharging tank is pressurized and then is communicated with the slag collecting tank again.

The principle of the deslagging method after high-temperature gasification of the high-sulfur coal is as follows:

in step 1 of the invention, the molten slag and ash obtained after high-temperature gasification of the high-sulfur coal are at 1600 ℃. The temperature of the grey water obtained in step 1 was 72 ℃.

In step 2 of the method, the hydrocyclone is arranged, so that the solid particle content in the chilled water can be controlled to be 1 wt% -1.5 wt%. The circulating grey water cooler is arranged, and the grey water can be cooled to below 50 ℃ by utilizing circulating cooling water.

The deslagging method after high-temperature gasification of the high-sulfur coal has the beneficial effects that:

1. the deslagging method after high-temperature gasification of the high-sulfur coal has the advantages of high deslagging efficiency, good deslagging effect, simplicity and convenience in operation, low energy consumption, low treatment cost, small environmental pollution and the like.

2. The deslagging method after high-temperature gasification of the high-sulfur coal has wide market prospect and is suitable for large-scale popularization and application.

On the basis of the technical scheme, the invention can be further improved as follows.

Further, in the step 1, a slag breaker is arranged between the ash slag quenching tank and the collecting tank.

The adoption of the further beneficial effects is as follows: the slag crusher is arranged, so that large slag can be crushed into small slag.

Further, in step 2, the grey water is drawn from the top of the slag collection tank by a circulation pump.

The adoption of the further beneficial effects is as follows: grey water may be drawn from the top of the slag collection tank by a circulation pump.

Further, in the step 3, the grey water in the slag dewatering bin enters a clarifying tank through a slag water discharge pump; and the slag in the slag dewatering bin is fished out by a slag dragging machine and enters the intermediate slag field through a slag conveying belt conveyor.

Further, in step 4, the circulating water comes from an internal circulating water buffer tank and has the temperature of 40 ℃.

The adoption of the further beneficial effects is as follows: by adopting the circulating water, the effect of re-injecting water into the slag discharging tank can be achieved, and the production cost can be saved.

Further, in step 4, the pressurization is performed to 4.5MPa by using high-pressure nitrogen.

Detailed Description

The principles and features of this invention are described below in conjunction with specific embodiments, which are set forth merely to illustrate the invention and are not intended to limit the scope of the invention.

The deslagging method of the high-sulfur coal after high-temperature gasification comprises the following steps:

step 1: molten slag and ash obtained after high-temperature gasification of high-sulfur coal enter an ash quenching tank at the bottom of the gasification furnace, are quenched when meeting water, are decomposed into small ash particles, are crushed by a slag breaker and then flow into a slag collecting tank to respectively obtain slag and ash water.

Step 2: and (3) pumping the grey water obtained in the step (1) out of the top of the slag collecting tank, sequentially passing through a hydrocyclone and a circulating grey water cooler, and returning to the ash slag quenching tank.

And step 3: when all the slag obtained in the step (1) enters a slag discharging tank, isolating the slag discharging tank from a slag collecting tank and starting pressure relief, and then, discharging all the slag into a slag dewatering bin; and the grey water in the slag dewatering bin enters a clarifying tank through a slag water discharge pump, and slag in the slag dewatering bin is fished out by a slag dragging machine and enters the intermediate slag field through a slag conveying belt conveyor.

And 4, step 4: and introducing circulating water into the slag discharging tank, wherein the circulating water is from an internal circulating water buffer tank and has the temperature of 40 ℃, flushing and re-injecting water, pressurizing to 4.5MPa by using high-pressure nitrogen, and re-communicating with the slag collecting tank.

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.