阅读说明：本技术 一种高硫煤高温气化后的洗涤方法 (Washing method for high-sulfur coal after high-temperature gasification ) 是由 刘文林 韩世良 郭志鹏 付鹏兵 阎波 黄丹 杨璐 和坤英 李芳� 于 2020-06-10 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洗涤方法,属于洗涤技术领域。其包括如下步骤：来自飞灰过滤器的粗合成气与来自洗涤塔底部的洗涤水,在文丘里洗涤器中充分混合后,再送入所述洗涤塔底部,经分离后,气体沿填料层上升,与来自所述洗涤塔塔顶的洗涤水在填料层中接触,得到洗涤后的粗合成气；液体沿填料层下降,得到循环洗涤水；洗涤后的粗合成气分为两股；循环洗涤水从所述洗涤塔底部流出,经循环水泵加压后,分为三部分。本发明的高硫煤高温气化后的洗涤方法,具有洗涤效果好、操作容易、可循环利用、处理成本低和环境污染小等优点,市场前景广阔,适合规模化推广应用。(The invention discloses a washing method of high-sulfur coal after high-temperature gasification, and belongs to the technical field of washing. Which comprises the following steps: the method comprises the following steps that raw synthesis gas from a fly ash filter and washing water from the bottom of a washing tower are fully mixed in a Venturi scrubber and then are sent to the bottom of the washing tower, after separation, gas rises along a packing layer and contacts with the washing water from the top of the washing tower in the packing layer, and washed raw synthesis gas is obtained; the liquid descends along the packing layer to obtain circulating washing water; dividing the washed crude synthesis gas into two parts; circulating washing water flows out from the bottom of the washing tower and is divided into three parts after being pressurized by a circulating water pump. The washing method of the high-sulfur coal after high-temperature gasification has the advantages of good washing effect, easiness in operation, recycling, low treatment cost, small environmental pollution and the like, has wide market prospect, and is suitable for large-scale popularization and application.)

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

step 1: the method comprises the following steps that raw synthesis gas from a fly ash filter and washing water from the bottom of a washing tower are fully mixed in a Venturi scrubber and then are sent to the bottom of the washing tower, after separation, gas rises along a packing layer and contacts with the washing water from the top of the washing tower in the packing layer, and washed raw synthesis gas is obtained; the liquid descends along the packing layer to obtain circulating washing water;

step 2: the washed crude synthesis gas obtained in the step 1 is divided into two streams, and one stream is used as a product gas and sent to a downstream device; one strand of the gas is used as chilling gas and sent into a circulating gas compressor, and the chilling gas is circulated to the outlet of the gasification furnace after being compressed;

and step 3: the circulating washing water obtained in the step 1 flows out from the bottom of the washing tower, is pressurized by a circulating water pump and then is divided into three parts, and one part is sent to the top of the washing tower; one part is sent to the venturi scrubber and the remaining part is sent to a waste water stripping and clarifying unit.

2. The method for washing the high-sulfur coal after high-temperature gasification according to claim 1, wherein in the step 1, the pressure of the raw synthesis gas is 4.14MPa, and the temperature is 335 ℃; the temperature of the washing water was 169 ℃.

3. The method for washing the high-sulfur coal after high-temperature gasification according to claim 1, wherein in step 1, a lye inlet is further provided at the front end of the venturi scrubber inlet.

4. The method for washing the high-sulfur coal after high-temperature gasification according to claim 3, wherein the alkali liquor is a NaOH solution with a mass percentage concentration of 20%.

Technical Field

The invention relates to a washing method of high-sulfur coal after high-temperature gasification, and belongs to the technical field of washing.

Background

Currently, coal and oil remain the two major energy sources worldwide. Generally, coal having a sulfur content of more than 3% is called high-sulfur coal. At present, nearly 8 percent of coal resources already proved in China are high-sulfur coal. The SO in the flue gas can be greatly improved in the using process of the high-sulfur coal₂Concentration of (3) and SO₂The total amount of emissions, thereby having a bad influence on the environment.

After high-temperature gasification of high-sulfur coal, high-temperature oil gas containing coal ash is generated. If the oil gas is not treated properly, the environment is polluted greatly, and the production cost is increased. In view of the above, it is necessary to provide a method for washing high-sulfur coal after high-temperature gasification to overcome the defects of the prior art.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a washing method for high-sulfur coal after high-temperature gasification. The washing method of the high-sulfur coal after high-temperature gasification has the advantages of good washing effect, easiness in operation, recycling, low treatment cost, small environmental pollution and the like, has wide market prospect, and is suitable for large-scale popularization and application.

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

step 1: the method comprises the following steps that raw synthesis gas from a fly ash filter and washing water from the bottom of a washing tower are fully mixed in a Venturi scrubber and then are sent to the bottom of the washing tower, after separation, gas rises along a packing layer and contacts with the washing water from the top of the washing tower in the packing layer, and washed raw synthesis gas is obtained; the liquid descends along the packing layer to obtain circulating washing water;

step 2: the washed crude synthesis gas obtained in the step 1 is divided into two streams, and one stream is used as a product gas and sent to a downstream device; one strand of the gas is used as chilling gas and sent into a circulating gas compressor, and the chilling gas is circulated to the outlet of the gasification furnace after being compressed;

and step 3: the circulating washing water obtained in the step 1 flows out from the bottom of the washing tower, is pressurized by a circulating water pump and then is divided into three parts, and one part is sent to the top of the washing tower; one part is sent to the venturi scrubber and the remaining part is sent to a waste water stripping and clarifying unit.

The principle of the invention is as follows:

in step 1 of the present invention, the gas rises along the packing layer and contacts with the washing water from the top of the washing column in the packing layer, so that HC i, HF and a trace amount of solid particles in the raw synthesis gas can be removed.

In step 3 of the present invention, the remaining portion of the recycled wash water is sent to a wastewater stripping and clarification unit to prevent the accumulation of corrosive components, salts and suspended solids in the system.

The washing method after the high-sulfur coal is gasified at high temperature has the beneficial effects that:

the washing method of the high-sulfur coal after high-temperature gasification has the advantages of good washing effect, easiness in operation, recycling, low treatment cost, small environmental pollution and the like, 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, the pressure of the crude synthesis gas is 4.14MPa, and the temperature is 335 ℃; the temperature of the washing water was 169 ℃.

Further, in the step 1, an alkali liquor feeding port is arranged at the front end of the inlet of the Venturi scrubber.

The adoption of the further beneficial effects is as follows: the alkali liquor feeding port is arranged, so that the removal efficiency of acid components in the crude synthesis gas from the fly ash filter can be improved.

Furthermore, the alkali liquor is a NaOH solution with the mass percentage concentration of 20%.

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

step 1: the raw synthesis gas from the fly ash filter (the pressure of the raw synthesis gas is 4.14MPa, the temperature is 335 ℃) and the washing water from the bottom of the washing tower (the temperature of the washing water is 169 ℃) are fully mixed in the Venturi scrubber and then sent to the bottom of the washing tower. And a NaOH solution inlet with the mass percentage concentration of 20% is also arranged at the front end of the inlet of the Venturi scrubber. After separation, the gas rises along the packing layer and contacts with washing water from the top of the washing tower in the packing layer to obtain washed crude synthesis gas; the liquid descends along the packing layer to obtain the circulating washing water.

Step 2: the washed crude synthesis gas obtained in the step 1 is divided into two streams, and one stream is used as a product gas and sent to a downstream device; one strand of the gas is used as chilling gas and sent into a circulating gas compressor, and the gas is circulated to the outlet of the gasification furnace after being compressed.

And step 3: the circulating washing water obtained in the step 1 flows out from the bottom of the washing tower, is pressurized by a circulating water pump and then is divided into three parts, and one part is sent to the top of the washing tower; one part is sent to the venturi scrubber and the remaining part is sent to a waste water stripping and clarifying unit.

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.