阅读说明：本技术 一种超细煤粉气化炉的污水、污泥全回收系统及方法 (Sewage and sludge full recovery system and method of superfine pulverized coal gasification furnace ) 是由 罗丽珍 王鹏杰 刘刚 任永强 樊强 于 2019-11-01 设计创作，主要内容包括：本发明提供的一种超细煤粉气化炉的污水、污泥全回收系统及方法,利用水洗装置将煤气化炉的合成气进行处理,再送至下游设备进行再次净化,形成以CO和H<Sub>2</Sub>为主的变换气；利用初步水处理将水洗装置的黑水和煤气化炉的渣池清液进行初步处理得到相对干净的灰水,利用生化处理系统将灰水和下游设备的冷凝水进行生化处理,之后和循环水站的污水进行沉降处理单元进行沉降处理去除污泥,得到的再生水分为两股,一股经除盐去变换炉水冷壁,一股汇集污泥中的有机水作为气化炉补水,在气化炉中降解；污泥经脱水后,泥饼和超细煤粉混合进入气化炉,在气化炉中进行气化。本系统利用气化炉的高温氛围,回收利用了煤气化系统产生的污水及污泥,变废为宝。(The invention provides a system and a method for fully recovering sewage and sludge of a superfine pulverized coal gasification furnace 2 A primary ventilation gas; carrying out primary treatment on black water of a washing device and clear liquid of a slag pool of a coal gasifier by using primary water treatment to obtain relatively clean grey water, carrying out biochemical treatment on the grey water and condensed water of downstream equipment by using a biochemical treatment system, and then carrying out sedimentation treatment on the grey water and condensed water of circulating water station by using a sedimentation treatment unit to remove sludge, wherein the obtained regenerated water is divided into two streams, one stream is desalted to remove a water-cooled wall of a shift converter, and the other stream is collected organic water in the sludge to be used as water supplement of the gasifier to be degraded in the gasifier; after the sludge is dehydrated, the sludge cake and the superfine coal powder are mixed and enter a gasification furnace, and gasification is carried out in the gasification furnace. The system utilizes the high-temperature atmosphere of the gasification furnace, recycles the sewage and sludge generated by the coal gasification system, and changes waste into valuable.)

1. A sewage and sludge full recovery system of a superfine pulverized coal gasification furnace is characterized by comprising a coal gasification furnace (1), a water washing device (2), primary water treatment (3), a biochemical treatment system (4), sedimentation treatment (5), a sludge treatment device, a synthetic gas purification device and a desalting device (10), wherein a gas outlet of the coal gasification furnace (1) is connected with an outlet of the water washing device (2), a coal gas synthetic gas outlet of the water washing device (2) is connected with an inlet of the synthetic gas purification device, and a clean effective gas outlet of the synthetic gas purification device is connected with downstream equipment; a clear liquid outlet of a slag pool of the coal gasification furnace and a slag liquid outlet of the water washing device (2) are both connected with an inlet of the primary water treatment (3), an outlet of the primary water treatment (3) is connected with a biochemical treatment system (4), an outlet of the biochemical treatment system (4) is connected with an inlet of the sedimentation treatment (5), a sludge outlet of the sedimentation treatment (5) is connected with a sludge treatment device, and a sludge cake outlet of the sludge treatment device is connected with an inlet of the coal gasification furnace (1); a clear liquid outlet of the sedimentation treatment (5) is divided into two paths, and one path of clear liquid is connected with a water-cooled wall inlet of the synthesis gas purification device through a desalination device (10); the other path is connected with the inlet of the coal gasifier (1) at the organic wastewater outlet of the sludge treatment device.

2. The sewage and sludge full recovery system of the superfine pulverized coal gasification furnace as claimed in claim 1, wherein the biochemical treatment system (4) is further provided with a condensate inlet of a downstream device, a domestic sewage inlet and a sewage discharge inlet of a circulating water station.

3. The system for recycling sewage and sludge of the ultrafine pulverized coal gasification furnace according to claim 1, wherein the sludge treatment device comprises a sludge concentration device (6) and a stacked spiral dehydrator (7), wherein a sludge outlet of the sedimentation treatment (5) is connected with an inlet of the sludge concentration device (6), an outlet of the sludge concentration device (6) is connected with an inlet of the stacked spiral dehydrator (7), and a sludge cake outlet of the stacked spiral dehydrator (7) is connected with an inlet of the coal gasification furnace (1).

4. The system for recycling sewage and sludge of the ultrafine pulverized coal gasification furnace according to claim 4, wherein the screw-stacking dehydrator (7) is provided with a PAM coagulant inlet.

5. The system for recycling sewage and sludge of the ultrafine pulverized coal gasification furnace according to claim 1, wherein the syngas purification device comprises a conversion device (8) and a purification device (9), wherein the syngas outlet of the water washing device (2) is connected with the inlet of the conversion device (8), the outlet of the conversion device (8) is connected with the inlet of the purification device (9), and the clean effective gas of the purification device (9) is connected with downstream equipment.

6. The system for recycling sewage and sludge of the superfine pulverized coal gasification furnace according to claim 1, wherein the coal gasification furnace (1) is provided with a superfine pulverized coal inlet, an oxygen inlet and a slag outlet.

7. The system for recycling sewage and sludge of the gasification furnace of ultrafine coal powder according to claim 6, wherein the ultrafine coal powder is coal particles smaller than 40 μm.

8. A full recovery method of sewage and sludge of an ultrafine pulverized coal gasification furnace is characterized in that the full recovery system of sewage and sludge of the ultrafine pulverized coal gasification furnace based on any one of claims 1 to 7 comprises the following steps:

superfine coal powder, oxygen and steam are gasified into coal gas synthetic gas in a coal gasifier (1), clear liquid of a slag pool enters a primary water treatment device (3), and the coal gas synthetic gas passes through a water washing device (2) and then is sent to a synthetic gas purification devicePurifying to form CO and H₂A predominantly converted gas to downstream equipment;

the black water of the water washing device (2) is subjected to primary water treatment (3) and is treated into relatively clean grey water, the gasified grey water is subjected to biochemical treatment in a biochemical treatment system (4), and then enters a sedimentation treatment (5), after sedimentation treatment, a part of regenerated water enters a desalting device (10) and is supplemented to a water-cooled wall of a synthesis gas purification device as desalted water; the other part of the reclaimed water is collected into organic water removed in the sludge treatment device to be used as water supplement of the coal gasification furnace (1), and mud cakes from the sludge treatment device and superfine coal powder are mixed and enter the coal gasification furnace for gasification.

Technical Field

The invention belongs to the technical field of clean energy, and particularly relates to a system and a method for fully recovering sewage and sludge of a superfine pulverized coal gasification furnace.

Background

The basic position of coal in the energy structure of China can not be changed for a long time, and the core technology of the large-scale high-efficiency coal gasification technology is monopolized abroad for a long time as the foundation and the bottleneck of the utilization of coal resources. The development of the advanced coal gasification technology with independent intellectual property rights in China is an effective way for improving the innovation capability of the clean coal technology in China, promoting the transformation of the innovation result with the independent intellectual property rights and the equipment integration innovation, and has a great driving effect on promoting the development of the clean coal gasification technology and the industrialization thereof in China. The superfine coal powder microscale effect and the oxidation technology are beneficial to further improving the gasification efficiency, improving the ash fusion fluidity, regulating and controlling the generation of pollutants and the like, provide important guarantee for the efficient, safe and stable operation of the entrained flow gasification technology, and are potential research and development directions of the entrained flow gasification technology.

With the rapid development of industrial production, the problem of water pollution is becoming more severe, which has adverse effects on human living environment and urban image. The current sewage of China has the problems of large sewage treatment capacity, low treatment degree and the like, and the high-quality effluent and energy/resource recovery are important development targets of the international sewage treatment industry. The technical research is the leading direction for promoting the development of the water treatment industry in China in the future. At the same time, sludge treatment accompanied with sewage is a serious problem facing industrial development.

The coal gasification sewage and sludge treatment is an important ring for the clean utilization of coal, forms a system of coal gasification wastewater treatment and sludge recovery, and is a booster for the clean utilization of coal.

The high temperature atmosphere that superfine coal powder gasifier produced can make organic waste water and the pyrolysis of mud that coal gasification equipment produced, and this patent has realized the utilization of coal gasification sewage and mud as a resource based on this.

Disclosure of Invention

The invention aims to provide a system and a method for fully recycling sewage and sludge of a superfine pulverized coal gasification furnace, which realize resource utilization of the sewage and sludge in a coal gasification technology.

In order to achieve the purpose, the invention adopts the technical scheme that:

the invention provides a full recovery system of sewage and sludge of a superfine pulverized coal gasification furnace, which comprises a coal gasification furnace, a water washing device, primary water treatment, a biochemical treatment system, sedimentation treatment, a sludge treatment device, a synthetic gas purification device and a desalting device, wherein a gas outlet of the coal gasification furnace is connected with an outlet of the water washing device, a coal gas synthetic gas outlet of the water washing device is connected with an inlet of the synthetic gas purification device, and a clean effective gas outlet of the synthetic gas purification device is connected with downstream equipment; the clear liquid outlet of the slag pool of the coal gasification furnace and the slag liquid outlet of the water washing device are both connected with the inlet of primary water treatment, the outlet of the primary water treatment is connected with a biochemical treatment system, the outlet of the biochemical treatment system is connected with the inlet of sedimentation treatment, the sludge outlet of the sedimentation treatment is connected with a sludge treatment device, and the sludge cake outlet of the sludge treatment device is connected with the inlet of the coal gasification furnace; the clear liquid outlet of the sedimentation treatment is divided into two paths, and one path is connected with the water-cooled wall inlet of the synthesis gas purification device through the desalting device; the other path is connected with the inlet of the coal gasifier at the organic wastewater outlet of the sludge treatment device.

Preferably, the biochemical treatment system is also provided with a condensate inlet of a downstream device, a domestic sewage inlet and a sewage discharge inlet of a circulating water station.

Preferably, the sludge treatment device comprises a sludge concentration device and a spiral-wound dehydrator, wherein a sludge outlet for sedimentation treatment is connected with an inlet of the sludge concentration device, an outlet of the sludge concentration device is connected with an inlet of the spiral-wound dehydrator, and a mud cake outlet of the spiral-wound dehydrator is connected with an inlet of the coal gasification furnace.

Preferably, the screw lamination dehydrator is provided with a PAM coagulant inlet.

Preferably, the synthesis gas purification device comprises a conversion device and a purification device, wherein the synthesis gas outlet of the water washing device is connected with the inlet of the conversion device, the outlet of the conversion device is connected with the inlet of the purification device, and the clean effective gas of the purification device is connected with downstream equipment.

Preferably, the coal gasifier is provided with an ultrafine coal powder inlet, an oxygen inlet and a slag outlet.

Preferably, the ultrafine coal powder is coal particles smaller than 40 μm.

A full recovery method of sewage and sludge of a superfine pulverized coal gasification furnace is based on the full recovery system of sewage and sludge of the superfine pulverized coal gasification furnace, and comprises the following steps:

superfine coal powder, oxygen and steam are gasified into coal gas synthetic gas in a coal gasifier, clear liquid in a slag pool enters primary water treatment, and the coal gas synthetic gas passes through a water washing device and then is sent to a synthetic gas purifying device to be purified to form CO and H₂A predominantly converted gas to downstream equipment;

the black water of the water washing device is subjected to primary water treatment to obtain relatively clean grey water, the gasified grey water is subjected to biochemical treatment in a biochemical treatment system and then enters a sedimentation treatment, and after the sedimentation treatment, a part of regenerated water enters a desalting device and is used as desalted water to be supplemented to a water-cooled wall of a synthesis gas purification device; the other part of the reclaimed water is collected into organic water removed in the sludge treatment device to be used as water supplement of the coal gasification furnace, and a mud cake from the sludge treatment device and the superfine coal powder are mixed and enter the coal gasification furnace for gasification.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a sewage and sludge full recovery system of a superfine pulverized coal gasification furnace, which utilizes a water washing device to remove waterThe synthesis gas of the coal gasifier is treated and sent to downstream equipment for purification again to form CO and H₂A primary ventilation gas; carrying out primary treatment on black water of a washing device and clear liquid of a slag pool of a coal gasifier by using primary water treatment to obtain relatively clean grey water, carrying out biochemical treatment on the grey water and condensed water of downstream equipment by using a biochemical treatment system, and then carrying out sedimentation treatment on the grey water and condensed water of circulating water station by using a sedimentation treatment unit to remove sludge, wherein the obtained regenerated water is divided into two streams, one stream is desalted to remove a water-cooled wall of a shift converter, and the other stream is collected organic water in the sludge to be used as water supplement of the gasifier to be degraded in the gasifier; after the sludge is dehydrated, the sludge cake and the superfine coal powder are mixed and enter a gasification furnace, and gasification is carried out in the gasification furnace. The system utilizes the high-temperature atmosphere of the gasification furnace, recycles the sewage and sludge generated by the coal gasification system, and changes waste into valuable.

The invention provides a method for fully recovering sewage and sludge of a superfine pulverized coal gasification furnace, which utilizes a water washing device to treat synthetic gas of the coal gasification furnace, and then the synthetic gas is sent to downstream equipment for secondary purification to form CO and H₂A primary ventilation gas; carrying out primary treatment on black water of a washing device and clear liquid of a slag pool of a coal gasifier by using primary water treatment to obtain relatively clean grey water, carrying out biochemical treatment on the grey water and condensed water of downstream equipment by using a biochemical treatment system, and then carrying out sedimentation treatment on the grey water and condensed water of circulating water station by using a sedimentation treatment unit to remove sludge, wherein the obtained regenerated water is divided into two streams, one stream is desalted to remove a water-cooled wall of a shift converter, and the other stream is collected organic water in the sludge to be used as water supplement of the gasifier to be degraded in the gasifier; after the sludge is dehydrated, the sludge cake and the superfine coal powder are mixed and enter a gasification furnace, and gasification is carried out in the gasification furnace. The system utilizes the high-temperature atmosphere of the gasification furnace, recycles the sewage and sludge generated by the coal gasification system, and changes waste into valuable.

Drawings

FIG. 1 is a schematic view of a sewage and sludge treatment system according to the present invention;

1. coal gasifier 2, water washing device 3, primary water treatment 4, biochemical treatment system 5, sedimentation treatment 6, sludge concentration 7, spiral-stacked dehydrator 8, shift converter 9, purifying device 10 and desalting device

Detailed Description

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

As shown in figure 1, the full recovery system of sewage and sludge of a superfine pulverized coal gasification furnace comprises a coal gasification furnace 1, a water washing device 2, a primary water treatment 3, a biochemical treatment system 4, a sedimentation treatment 5, a sludge concentration 6, a spiral-stacked dewaterer 7, a shift converter 8, a purification device 9 and a desalination device 10, wherein a gas outlet of the coal gasification furnace 1 is connected with an inlet of the water washing device 2, a coal gas synthetic gas outlet of the water washing device 2 is connected with an inlet of the shift converter 8, an outlet of the shift converter 8 is connected with an inlet of the purification device 9, and a clean gas outlet of the purification device 9 is connected with downstream equipment.

The clear liquid outlet of the slag pool of the coal gasification furnace 1 and the slag liquid outlet of the water washing device 2 are both connected with the inlet of the primary water treatment 3, the coal gasification ash water outlet of the primary water treatment 3 is connected with the inlet of the biochemical treatment system 4, the outlet of the biochemical treatment system 4 is connected with the inlet of the sedimentation treatment 5, and the sludge outlet of the sedimentation treatment 5 is connected with the sludge treatment device.

And a mud cake outlet of the sludge treatment device is connected with an inlet of the coal gasification furnace 1.

The clear liquid outlet of the sedimentation treatment device 5 is divided into two parts, wherein one clear liquid outlet is connected with the inlet of the desalting device 10, and the outlet of the desalting device 10 is connected with the water-cooled wall inlet of the conversion device 8; the other clear liquid outlet and the organic wastewater outlet of the sludge treatment device are both connected with the inlet of the coal gasifier 1.

The biochemical treatment system 4 is also provided with a condensate of a downstream device, domestic sewage and an inlet for sewage disposal of a circulating water station.

The sludge treatment device comprises a sludge concentration device 6 and a stacked spiral dehydrator 7, wherein a sludge outlet of the sedimentation treatment 5 is connected with an inlet of the sludge concentration device 6, an outlet of the sludge concentration device 6 is connected with an inlet of the stacked spiral dehydrator 7, and a mud cake outlet of the stacked spiral dehydrator 7 is connected with an inlet of the coal gasification furnace 1.

The screw-stacking dehydrator 7 is provided with a PAM coagulant inlet.

The fed superfine coal powder is coal particles with the particle size less than 40 mu m.

The organic wastewater generated by the coal gasification device is returned to the coal gasification furnace 1 for pyrolysis, thereby reducing the environmental pollution.

Sludge produced by the coal gasification device is mixed with superfine coal powder and gasified in the coal gasification furnace 1, thereby realizing waste recovery.

The shift converter 8 is filled with a cobalt-molybdenum shift catalyst, and CO and H are reacted at the temperature of 350-400 DEG C₂Reaction of O to CO₂And H₂。

The purification device 9 is used for desulfurization and decarburization, the MDEA solution is used for removing CO2 and H2S in the converted gas, and the wet desulfurization process is used for converting H2S into elemental sulfur.

The desalination device 10 removes salt in the regeneration water by reverse osmosis and membrane concentration.

The primary water treatment 3 is to remove ash carried in the gasified black water by a physical method so as to change the black water into grey water.

The biochemical treatment system 4 is used for degrading COD, BOD and ammonia nitrogen in the sewage.

The sedimentation treatment 5 is used for thoroughly degrading ammonia nitrogen and organic matters in the sewage in the biochemical treatment system 4, and the degraded water is subjected to sludge-water separation in the sedimentation treatment 5.