阅读说明：本技术 一种零水排放固定床气化装置及其方法 (Zero-water-discharge fixed bed gasification device and method thereof ) 是由 李冶 于 2021-10-08 设计创作，主要内容包括：本发明涉及固定床气化技术领域,具体涉及一种零水排放固定床气化装置及其方法,本发明的固定床气化装置,包括气化炉本体,还包括换热组件、过滤组件和增湿组件,本发明将煤气中的粉尘,通过过滤组件去除,煤气换热过程中的有机物冷凝液和冷凝水,通过增湿组件,水体直接生成气化炉本体所需水蒸气,重新回到气化炉本体,其余在增湿过程被降温的气体送入换热组件,继续进行换热,从而实现了煤气化过程中水的零排放；本发明的气化方法,其工艺流程简单合理,将煤气化过程中生成的煤气水直接生成气化所需的水蒸气回到了气化炉,最终煤气化过程没有水的排放,本发明尤为适合于产生焦油量较少,但有含酚水的煤气化制备煤气的生产过程。(The invention relates to the technical field of fixed bed gasification, in particular to a zero-water-discharge fixed bed gasification device and a method thereof, wherein the fixed bed gasification device comprises a gasification furnace body, a heat exchange component, a filtering component and a humidifying component, dust in coal gas is removed through the filtering component, organic matter condensate and condensed water in the heat exchange process of the coal gas directly generate water vapor required by the gasification furnace body through the humidifying component, the water vapor returns to the gasification furnace body again, and the rest of gas cooled in the humidifying process is sent to the heat exchange component for continuous heat exchange, so that zero discharge of water in the gasification process is realized; the gasification method has simple and reasonable process flow, directly generates the coal gas water generated in the coal gasification process into the steam required by the gasification and returns to the gasification furnace, and finally the coal gasification process has no water discharge.)

1. The zero-water-discharge fixed bed gasification device comprises a gasification furnace body, wherein a hot coal gas outlet is formed in the top end of the gasification furnace body, and an ash residue discharge port is formed in the bottom end of the gasification furnace body.

2. The zero-water-discharge fixed bed gasification device according to claim 1, further comprising a high-temperature stripping component and an organic matter recovery component, wherein the high-temperature stripping component is respectively connected with the humidifying component and the gasification furnace body, and the organic matter recovery component is connected with the humidifying component.

3. The zero-water-discharge fixed bed gasification device according to claim 1, further comprising a gas primary cooler, wherein the gas primary cooler is respectively connected with the gasification furnace body and the heat exchange assembly.

4. The zero-water-discharge fixed bed gasification device according to claim 2, wherein the heat exchange assembly comprises a heat exchanger, the heat exchanger is provided with a cooling water inlet, a cooling water outlet, a gas inlet, a gas outlet and a condensed water outlet, the gas inlet is connected with the gasification furnace body and the filter assembly, the condensed water outlet is connected with the filter assembly, the cooling water inlet is respectively connected with the filter assembly and the humidifying assembly, and the cooling water outlet is connected with the humidifying assembly.

5. The zero-water-discharge fixed bed gasification device according to claim 4, wherein the filter assembly comprises a filter, the filter is provided with a liquid inlet, a liquid outlet and a solid discharge port, the liquid inlet is connected with the condensed water outlet, the liquid outlet is respectively connected with the cooling water inlet and the coal gas inlet through a condensation pump, and the solid discharge port is used for discharging filtered solids.

6. The zero-water-discharge fixed bed gasification device according to claim 5, wherein the humidification component comprises an air humidification tower, the air humidification tower is provided with an air inlet, a hot water inlet, a hot gas outlet and a circulating water outlet, the air inlet is connected with an air blower, an air distribution structure is arranged at the position, close to the air inlet, on the inner side of the air humidification tower, the hot water inlet is connected with the cooling water outlet, the hot gas outlet is connected with the gasification furnace body, a make-up water vapor pipeline is connected at the position of the hot water inlet or the position of the hot gas outlet, and the circulating water outlet is respectively connected with the cooling water inlet, the high-temperature stripping component and the organic matter recovery component through a circulating water pump.

7. The fixed bed gasification device with zero water discharge according to claim 6, wherein the high temperature stripping assembly comprises a high temperature stripper, the high temperature stripper is provided with a circulating water inlet, a high temperature steam inlet and a stripping gas outlet, the circulating water inlet is connected with the circulating water outlet, and the stripping gas outlet is connected with the gasification furnace body.

8. The fixed bed gasification device with zero water discharge according to claim 6, wherein a temperature detector and a temperature controller are arranged at the hot gas outlet, and a gas preheater is arranged between the hot gas outlet and the gasification furnace body.

9. The fixed bed gasification device with zero water discharge according to claim 6, wherein the heat exchanger and the air humidification tower are respectively provided with a liquid level measuring instrument and are respectively connected with a water replenishing pipeline.

10. A gasification method using the zero-water-discharge fixed bed gasification apparatus according to any one of claims 1 to 9, comprising the steps of:

when the temperature of the coal gas leaving the gasification furnace body and the organic matter content are lower, the coal gas directly enters the heat exchange assembly, and when the temperature of the coal gas leaving the gasification furnace body and the organic matter content are higher, the coal gas firstly enters the coal gas primary cooler, the excess heat is recycled, and the heavy organic matter is firstly separated out and then enters the heat exchange assembly;

the coal gas is cooled by water in the heat exchange assembly, organic matters and water vapor are simultaneously cooled out, condensate is generated, after solids are removed by the condensate through the filtering assembly, part of water is sent to the heat exchange assembly to be used as cooling water, and the other part of water is mixed with the coal gas and then enters the heat exchange assembly again;

sending cooling water heated in the heat exchange process of the heat exchange component into the humidifying component, enabling the water body to be in contact with air or oxygen entering the humidifying component, enabling part of the water body to evaporate to enable the air or the oxygen to form saturated vapor, then enabling the saturated vapor to leave the humidifying component and enter the gasification furnace body to participate in reaction, and enabling the rest of the water body to be cooled and concentrated;

the water is sent into a high-temperature stripping assembly, organic matters in the water are stripped by high-temperature gas, the stripping gas is sent into a gasification furnace body to participate in reaction, and the water is sent into an organic recovery unit to recover and purify the organic matters in the water;

the circulation realizes zero water discharge in the coal gasification process.

Technical Field

The invention relates to the technical field of fixed bed gasification, in particular to a zero-water-discharge fixed bed gasification device and a method thereof.

Background

The fixed bed (also called moving bed) gasification furnace is the oldest coal gasification equipment and has the characteristics of mature technology, reliable equipment, flexible production operation, high thermal efficiency in the coal conversion process and the like. Although the modern coal gasification technology has advancement in various aspects such as raw materials, environmental protection and the like, the fixed bed gasification still has proper application prospect, particularly after slag ash discharge is adopted, the processing capacity of the fixed bed gasification under the pressurization condition is obviously improved, and the environmental protection characteristic is improved. The fixed bed gasification furnace has the important characteristics of simple raw material preparation, high methane yield, high value-added tar byproduct and high thermal efficiency compared with other technologies, and particularly has obvious low oxygen consumption, so that the fixed bed gasification furnace has special attraction in the field of coal gasification combined cycle power generation.

However, due to the limitation of the characteristics of the coal gas, in the fixed bed gasification process, the coal gas contains macromolecular organic matters, although anthracite is used as a raw material, the generated coal gas water still contains organic matters, and the emission standard can be met only after the coal gas water is treated in a subsequent complex process. Therefore, there is a need for improvements to the current fixed bed gasification process.

Disclosure of Invention

In order to solve the problems, the invention provides a zero-water-discharge fixed bed gasification device and a method thereof, which have the advantages of simple structure and reasonable process, and the zero discharge of water is realized in the coal gasification process.

The technical scheme adopted by the invention is as follows:

the zero-water-discharge fixed bed gasification device comprises a gasification furnace body, wherein a hot coal gas outlet is formed in the top end of the gasification furnace body, an ash residue discharge port is formed in the bottom end of the gasification furnace body, the zero-water-discharge fixed bed gasification device further comprises a heat exchange assembly, a filtering assembly and a humidifying assembly, the heat exchange assembly and the humidifying assembly are respectively connected with the gasification furnace body, and the filtering assembly is connected with the heat exchange assembly.

The technical scheme is further improved by further comprising a high-temperature stripping component and an organic matter recovery component, wherein the high-temperature stripping component is respectively connected with the humidifying component and the gasification furnace body, and the organic matter recovery component is connected with the humidifying component.

The further improvement of the technical scheme is that the gasifier further comprises a coal gas primary cooler, and the coal gas primary cooler is respectively connected with the gasifier body and the heat exchange assembly.

The technical scheme is further improved in that the heat exchange assembly comprises a heat exchanger, the heat exchanger is provided with a cooling water inlet, a cooling water outlet, a coal gas inlet, a coal gas outlet and a condensed water outlet, the coal gas inlet is connected with the gasification furnace body and the filtering assembly, the condensed water outlet is connected with the filtering assembly, the cooling water inlet is respectively connected with the filtering assembly and the humidifying assembly, and the cooling water outlet is connected with the humidifying assembly.

The technical scheme is further improved in that the filtering assembly comprises a filter, the filter is provided with a liquid inlet, a liquid outlet and a solid discharging port, the liquid inlet is connected with a condensed water outlet, the liquid outlet is respectively connected with the cooling water inlet and the coal gas inlet through a condensing pump, and the solid discharging port is used for discharging filtered solids.

The technical scheme is further improved in that the humidifying component comprises an air humidifying tower, the air humidifying tower is provided with an air inlet, a hot water inlet, a hot air outlet and a circulating water outlet, the air inlet is connected with an air blower, the inner side of the air humidifying tower is close to the position of the air inlet, an air distribution structure is arranged, the hot water inlet is connected with the cooling water outlet, the hot air outlet is connected with the gasification furnace body, the hot water inlet position or the hot air outlet position is connected with a supplementary steam pipeline, and the circulating water outlet is respectively connected with the cooling water inlet, the high-temperature steam stripping component and the organic matter recovery component through a circulating water pump.

The technical scheme is further improved in that the high-temperature stripping assembly comprises a high-temperature stripper, the high-temperature stripper is provided with a circulating water inlet, a high-temperature steam inlet and a stripping gas outlet, the circulating water inlet is connected with the circulating water outlet, and the stripping gas outlet is connected with the gasifier body.

The further improvement on the technical scheme is that a temperature measuring and controlling device is arranged at the hot gas outlet, and a gas preheater is arranged between the hot gas outlet and the gasification furnace body.

The technical proposal is further improved in that the heat exchanger and the air humidifying tower are respectively provided with a liquid level measuring instrument and are respectively connected with a water replenishing pipeline.

The gasification method using the zero water discharge fixed bed gasification device comprises the following steps:

when the temperature of the coal gas leaving the gasification furnace body and the organic matter content are lower, the coal gas directly enters the heat exchange assembly, and when the temperature of the coal gas leaving the gasification furnace body and the organic matter content are higher, the coal gas firstly enters the coal gas primary cooler, the excess heat is recycled, and the heavy organic matter is firstly separated out and then enters the heat exchange assembly;

the coal gas is cooled by water in the heat exchange assembly, organic matters and water vapor are simultaneously cooled out, condensate is generated, after solids are removed by the condensate through the filtering assembly, part of water is sent to the heat exchange assembly to be used as cooling water, and the other part of water is mixed with the coal gas and then enters the heat exchange assembly again;

sending cooling water heated in the heat exchange process of the heat exchange component into the humidifying component, enabling part of water to be in contact with air entering the humidifying component to form saturated steam, then leaving the humidifying component, entering the gasification furnace body to participate in reaction, and cooling and gathering the rest of water, wherein when less water is sent into the humidifying component, a water supplementing pipeline is adopted to supplement water into the humidifying component, the cooled and gathered part of water is sent into the heat exchange component to be used as cooling water, and the cooled and gathered rest of water is respectively sent into the high-temperature stripping component and the organic recovery unit to be treated;

the water is sent into a high-temperature stripping assembly, organic matters in the water are stripped by high-temperature gas, the stripping gas is sent into a gasification furnace body to participate in reaction, and the water is sent into an organic recovery unit to recover and purify the organic matters in the water;

the circulation realizes zero water discharge in the coal gasification process.

The invention has the following beneficial effects:

1. the invention relates to a fixed bed gasification device, which comprises a gasification furnace body, wherein the top end of the gasification furnace body is provided with a hot gas outlet, the bottom end of the gasification furnace body is provided with an ash residue outlet, the fixed bed gasification device also comprises a heat exchange component, a filter component and a humidifying component, the heat exchange component and the humidifying component are respectively connected with the gasification furnace body, and the filter component is connected with the heat exchange component. The gasification method of the invention directly uses sensible heat of coal gas for heating coal gas water, is energy integration and optimized utilization, and is mainly characterized by overcoming the problem that a large amount of coal gas water is generated in the coal gas generation process and needs to be treated or discharged, effectively solving the problem of coal gas water treatment in the coal gasification process from the source, and having good popularization and application prospects.

2. The gasification method has simple and reasonable process flow, stable operation and simple and convenient control, directly generates the steam required by gasification from the coal gas water generated in the coal gasification process and returns the steam to the gasification furnace, and finally the coal gasification process has no water discharge.

Drawings

FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;

FIG. 2 is a schematic structural diagram according to a second embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a third embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a fourth embodiment of the present invention;

description of reference numerals: 1. the gasifier comprises a gasifier body, 11 hot gas outlets, 12 ash and slag discharge outlets, 2 heat exchange assemblies, 21 heat exchangers, 211 cooling water inlets, 212 cooling water outlets, 213 gas outlets, 214 gas outlets, 215 condensed water outlets, 216 liquid level measuring instruments, 217 water replenishing pipelines, 3 filter assemblies, 31 filters, 311 liquid inlets, 312 liquid outlets, 313 solid discharge ports, 314 condensation pumps, 4 humidifying assemblies, 41 air humidifying towers, 411 air inlets, 412 hot water inlets, 413 hot gas inlets, 4131 temperature measuring and controlling instruments, 4132 gas preheaters, 414 circulating water outlets, 415 blowers, 416 air distribution structures, 417 steam replenishing pipelines, 418 circulating water pumps, 5 high-temperature stripping assemblies, 51 high-temperature strippers, 511 circulating water inlets, 512 high-temperature steam inlets, 513 stripping gas outlets, 6. Organic matter recovery component, 7, gas primary cooler.

Detailed Description

The invention will be further described with reference to the accompanying drawings.

The first embodiment is as follows:

as shown in fig. 1, the zero water discharge fixed bed gasification device of the embodiment includes a gasification furnace body 1, a hot gas outlet 11 is arranged at the top end of the gasification furnace body 1, an ash residue outlet 12 is arranged at the bottom end of the gasification furnace body 1, and further includes a heat exchange assembly 2, a filter assembly 3 and a humidification assembly 4, the heat exchange assembly 2 and the humidification assembly 4 are respectively connected with the gasification furnace body 1, and the filter assembly 3 is connected with the heat exchange assembly 2.

Specifically, the heat exchange assembly 2 includes a heat exchanger 21, the heat exchanger 21 is provided with a cooling water inlet 211, a cooling water outlet 212, a gas inlet 213, a gas outlet 214, and a condensed water outlet 215, the gas inlet 213 is connected to the gasifier body 1, the condensed water outlet 215 is connected to the filter assembly 3, the cooling water inlet 211 is connected to the filter assembly 3 and the humidification assembly 4, respectively, and the cooling water outlet 212 is connected to the humidification assembly 4.

In other embodiments, a subsequent cooler may be provided after the heat exchanger 21, the gas is cooled to a lower temperature by using a lower temperature cooling medium, the obtained condensate is combined with the condensate obtained from the heat exchanger 21, and the cooled gas enters the scrubbing unit.

The filter assembly 3 comprises a filter 31, the filter 31 is provided with a liquid inlet 311, a liquid outlet 312 and a solid discharge port 313, the liquid inlet 311 is connected with the condensed water outlet 215, the liquid outlet 312 is respectively connected with the cooling water inlet 211 and the coal gas inlet 213 through a condensation pump 314, and the solid discharge port 313 is used for discharging filtered solids.

Humidification subassembly 4 includes air humidification tower 41, air humidification tower 41 is equipped with air inlet 411, hot water inlet 412, hot gas export 413 and circulating water export 414, air inlet 411 is connected with air-blower 415, air humidification tower 41 is inboard to be close to air inlet 411's position is equipped with air distribution structure 416, hot water inlet 412 with cooling water export 212 connects, hot gas export 413 with gasifier body 1 connects hot water inlet 412 position or hot gas export 413 position is connected with make-up steam pipeline 417, circulating water export 414 through circulating water pump 418 with cooling water inlet 211 connects.

In the embodiment, the gasification furnace body 1 adopts air gasification, oxygen-enriched gasification or pure oxygen gasification, the temperature of coal gas leaving the top of the gasification furnace body 1 is 250-650 ℃, the coal gas contains organic matters such as coal tar, water-soluble organic matters (such as phenol) and unreacted water vapor, the coal gas is cooled by water in the heat exchanger 21, the organic matters and the water vapor are simultaneously cooled out to generate condensate, the condensate contains dust carried in the coal gas, the condensate is sent to the filter 31, the condensate passes through the filter 31 to remove solids, most of the water is sent back to the heat exchanger 21 to be used as a part of cooling water, and a small part of the water is sent to the coal gas inlet of the heat exchanger 21 to be mixed with the coal gas to form coal gas flow, so that the water content in the coal gas is increased, possible deposition in the heat exchanger 21 is favorably washed, and the heat exchange effect can be improved. The cooling water used in the heat exchanger 21 is heated in the process of cooling the coal gas, the heated water is sent into the air humidifying tower 41, the air entering the air humidifying tower 41 is contacted with the heating water, part of the water is evaporated to become water vapor, the water leaves the air humidifying tower 41 after humidifying the air and is sent into the gasification furnace body 1, the heat is absorbed in the process of the contact and evaporation of the air and the heating water, part of the water is cooled and is gathered at the bottom of the air humidifying tower 41, the temperature of the water gathered at the bottom of the tower is lower than the temperature of the water entering the tower from the heat exchanger 21, and the part of the water is used as circulating water and is sent to the heat exchanger 21 to be used for continuously cooling the coal gas. Therefore, sensible heat of the coal gas is transferred to the water vapor required by the gasification furnace body 1 through water, so that heat energy of the coal gas is fully utilized, in the actual operation process, the air flow of the gasification furnace body 1 is required for production, the moisture content of the air is also a parameter required to be ensured, when the temperature at the top of the air humidifying tower 41 cannot reach the required temperature, the heat from the coal gas heat exchanger 21 cannot meet the requirement of heat absorption of the water vapor generation quantity of air humidification, and partial low-pressure water vapor 413 can be added to the position of the hot water inlet 412 or directly added to the outlet air at the position of the hot gas outlet.

The make-up water may include gas wash water containing organic matter and other water bodies containing certain salts, etc.

In the embodiment, dust in the coal gas generated by the gasification furnace body 1 is removed through the filtering component 3, cooling water and condensed water in the coal gas heat exchange process pass through the humidifying component 4, water directly generates water vapor required by the gasification furnace body 1 and returns to the gasification furnace body 1 again, and the rest of gas cooled in the humidifying process is sent to the heat exchange component 2 to continuously exchange heat, so that zero emission of water in the coal gasification process is realized.

Example two:

as shown in fig. 2, on the basis of the above embodiment, a high-temperature stripping assembly 5 and an organic matter recovery assembly 6 are additionally provided, the high-temperature stripping assembly 5 is respectively connected with the humidification assembly 4 and the gasification furnace body 1, the organic matter recovery assembly 6 is connected with the humidification assembly 4, specifically, the high-temperature stripping assembly 5 includes a high-temperature stripper 51, the high-temperature stripper 51 is provided with a circulating water inlet 511, a high-temperature steam inlet 512 and a stripping gas outlet 513, the circulating water inlet 511 is connected with the circulating water outlet 414, and the stripping gas outlet 513 is connected with the gasification furnace body 1. In the air humidifying process in the air humidifying tower 41, part of water-soluble organic matters are stripped by air and enter the gasification furnace body 1 together for reaction, the water-soluble organic matters without being stripped and other impurities enter circulating water, the circulating water is sent to the heat exchanger 21 to be cooled for coal gas use, the concentration is high in the circulating process, part of the circulating water is removed from a circulating loop at the moment, one part of the circulating water is sent to the high-temperature stripper 51, after the organic matters are extracted by high-temperature steam or other high-temperature gases, the stripping gas is sent to the gasification furnace body 1 together for being used as reaction gases, the other part of the stripping gas can be sent to the organic matter recovery unit 6 for recovering and purifying the organic matters in water, and the circulation is carried out, so that zero water discharge in the coal gasification process is realized.

Example three:

as shown in fig. 3, on the basis of the above embodiment, the present embodiment further includes a gas primary cooler 7, and the gas primary cooler 7 is disposed between the gasifier body 1 and the heat exchange assembly 2.

The embodiment mainly aims at the problems that when the coal gas at the outlet of the gasification furnace is led out from the side surface of the body 1, the temperature of the coal gas at the outlet is higher, the coal gas has more sensible heat and the heat required by humidifying evaporated water is needed, or the coal gas contains more tar, on one hand, the excessive heat is recovered, and the residual sensible heat in the coal gas is used for humidifying air by arranging the coal gas primary cooler 7; on the other hand, the heavier coal tar is firstly condensed and separated, and specifically, the coal gas primary cooler 7 adopts water evaporation cooling and is set to operate under a certain steam pressure. In this case, the humid air enters both from the bottom and from the top of the gasifier.

Example four:

as shown in fig. 4, on the basis of the above embodiments, in this embodiment, in order to ensure stable operation of the condensate pump 314 and the circulating water pump 418, the heat exchanger 21 and the air humidifying tower 41 are respectively provided with a liquid level measuring instrument 216 and are respectively connected with a water replenishing pipeline 217, the bottoms of the heat exchanger 21 and the air humidifying tower 41 need to maintain a certain liquid level, the liquid level condition is monitored according to the liquid level measuring instrument, when the liquid level is normally continuously lowered, the water replenishing pipeline 217 is required at this time, for the water level in the heat exchanger 21, the normal operation of the liquid level and the condensate pump can be ensured by adjusting the amount of the filtrate entering from the gas inlet 213 of the filter assembly 3, a certain amount of water can also be replenished from the outside, and for the air humidifying tower, a certain amount of water can be replenished from the outside directly to maintain the balance of the consumption of the whole condensate and the humidified water. A temperature measuring and controlling device 4131 is arranged at the hot gas outlet 413, and a gas preheater 4132 is arranged between the hot gas outlet 413 and the gasification furnace body 1. When leaving the air humidifying tower 41, the water vapor content in the air basically reaches saturation, at this moment, according to the temperature measurement and control device 4131 arranged at the hot gas outlet 413, the water vapor content in the air can be known, because the gasification furnace body 1 has certain requirements on the water vapor content in the air, the hot gas temperature heating is carried out by arranging the gas preheater 4132, the requirement of the operation of the gasification furnace body 1 can be met, the heat value of the discharged coal gas can be improved by improving the temperature of the air entering the furnace, and the heating heat source can be low-pressure steam or hot flue gas and the like.

The gasification method using the zero water discharge fixed bed gasification device comprises the following steps:

when the temperature and the organic matter content of the coal gas leaving the gasification furnace body 1 are lower, the coal gas directly enters the heat exchange assembly 2, and when the temperature and the organic matter content of the coal gas leaving the gasification furnace body 1 are higher, the coal gas firstly enters the coal gas primary cooler 7, the excess heat is recycled, the heavy organic matter is firstly separated out, and then the coal gas enters the heat exchange assembly 2;

the coal gas is cooled by water in the heat exchange component 2, organic matters and water vapor are simultaneously cooled out to generate condensate, after solids are removed from the condensate by the filter component 3, part of water is sent to the heat exchange component 2 to be used as cooling water, and the other part of water is mixed with the coal gas and then enters the heat exchange component 2 again;

the cooling water heated in the heat exchange process of the heat exchange component 2 is sent into the humidifying component 4, part of the water body is contacted with the air entering the humidifying component 4 to form saturated vapor, then the saturated vapor leaves the humidifying component 4 and enters the gasification furnace body 1 to participate in the reaction, and the rest of the water body is cooled and gathered, wherein when the water body sent into the humidifying component 4 is less, a water supplementing pipeline 216 is adopted to supplement the water body into the humidifying component 4, the cooled and gathered part of the water body is sent into the heat exchange component 2 to be used as cooling water, and the cooled and gathered rest of the water body is respectively sent into the high-temperature stripping component 5 and the organic recovery component 6 to be treated;

the water body is sent into the high-temperature stripping component 5, after organic matters in the water body are stripped by high-temperature gas, the stripping gas is sent into the gasifier body 1 to participate in reaction, and is sent into the water body of the organic recovery component 6 to recover and purify the organic matters in the water;

the circulation realizes zero water discharge in the coal gasification process.

In the gasification method of the present invention, a typical low-pressure gasification furnace is operated under the condition that the temperature of the air in the gasification furnace body reaches 53 ℃ after humidification, and the water vapor content is about 15%. The water temperature at the bottom of the air humidifying tower is reduced to about 45 ℃, the water is sent to the heat exchanger through the circulating water pump, the water is heated to about 65 ℃, and the heated water is sent to the top of the air humidifying tower to contact with the air for humidification.

In the case of low-pressure pure oxygen gasification, when the gasification furnace is used for pure oxygen gasification under the pressure of 0.2MPa, the temperature of circulating water is adjusted to ensure that the temperature of the outlet of the humidifying tower reaches 115 ℃, the partial pressure of water vapor is 0.143MPa, and when the partial pressure of oxygen is 0.057, the moisture content of the gasification furnace is expressed as water vapor: oxygen represents up to 3: 1 (m)³/m³) Left and right.

Another example is that the gasification furnace is operated under pressure, the temperature of the circulating water is controlled to be about 235 ℃ when the pressure of the gasification furnace is 4.0MPa, oxygen is in contact with the circulating water in the air humidifying tower for humidification, and when the oxygen leaves the air humidifying tower, the moisture content of the oxygen is expressed as water vapor: oxygen represents up to 3: 1 (m)³/m³)。

The coal gas is cooled by water at 50-60 ℃ through a heat exchanger, the temperature is reduced to about 60 ℃, solid matters are removed from condensate collected at the bottom of the heat exchanger through a filter, and water filtered by the filter is delivered to the water side of the heat exchanger for water supplement. Because there is no water evaporation process at the water side of the gas cooling heat exchanger, the water side basically has no scaling problem, so that the long-period work of the heat exchanger can be facilitated.

The ash generated in the gasification furnace by the coal is discharged from the bottom of the gasification furnace.

The above are only examples and may be changed according to the change of the working conditions such as the type of coal, the oxygen concentration, and the operation pressure.

When the gasification method of the embodiment is applied to the existing gasification furnace device system, the existing coal gas cooling equipment is adopted, the coal gas condensate pump sends the filtered condensate to the air humidifier, the air humidifier is an indirect heat exchanger, the water vapor is used as a heating heat source (or other hot gases), the coal gas water is heated by the water vapor on the other side of the air humidifier, and the steam is condensed to obtain the condensate water. Air is introduced from the bottom of one side of gas water in a heat exchanger, the air is bubbled to contact with the water after passing through a nozzle or other air distribution structures, then the air passes through a heat exchange tube of the heat exchanger, water vapor in the air is saturated and then leaves the top of a humidifier, the air enters a gasification furnace after being heated by a gas preheater, the coal gas is cooled by cooling water and then is heated by the water vapor, and the air is required to be twice operated and consumed by the cooling water and the water vapor and is used for reforming the existing equipment system.

The gasification method has simple and reasonable process flow, stable operation and simple and convenient control, directly generates the steam required by gasification from the coal gas water generated in the coal gasification process and returns the steam to the gasification furnace, and finally the coal gasification process has no water discharge.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.