CN211035829U - Sewage and sludge full recovery system of superfine pulverized coal gasification furnace - Google Patents
Sewage and sludge full recovery system of superfine pulverized coal gasification furnace Download PDFInfo
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- CN211035829U CN211035829U CN201921880039.1U CN201921880039U CN211035829U CN 211035829 U CN211035829 U CN 211035829U CN 201921880039 U CN201921880039 U CN 201921880039U CN 211035829 U CN211035829 U CN 211035829U
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Abstract
The utility model provides a pair of sewage, the full recovery system of mud of superfine buggy gasifier utilizes water washing device to handle coal gasifier's synthetic gas, sends to low reaches equipment again and purifies once more, forms with 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.
Description
Technical Field
The utility model belongs to the technical field of clean energy, in particular to sewage, the full recovery system of mud of superfine buggy gasifier.
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
An object of the utility model is to provide a sewage, the complete recovery system of mud of superfine buggy gasifier has realized the utilization of coal gasification technology sewage and mud as resources.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
the utility model provides a sewage and sludge full recovery system of a superfine pulverized coal gasification furnace, which comprises a coal gasification furnace, a washing device, preliminary 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 washing device, a gas synthetic gas outlet of the 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.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a pair of sewage, the full recovery system of mud of superfine buggy gasifier utilizes water washing device to handle coal gasifier's synthetic gas, sends to low reaches equipment again and purifies once more, forms with 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 enterThe gasification furnace gasifies 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.
Example (b):
the existing synthesis gas yield is 25000Nm3The/h coal gasification unit, with TDI as the downstream product, requires conversion of syngas to CO: h21: 2, and sending the desulfurized and decarbonized effective gas to the downstream of the plant area. The circulating water amount for coal gasification, transformation and purification is 3000t/h, and the water supplement amount of the circulating water station is 1.2 percent, namely 36 t/h; the discharge capacity of the circulating water station is 0.18%, i.e. 5.4 t/h. The output of the gasified grey water is 23 t/h; the condensate of the device is 1 t/h.
Superfine buggy, oxygen and steam gasify in coal gasifier 1 into coal gas synthetic gas, and the slag bath clear solution gets into preliminary water treatment 3, and coal gas synthetic gas sends conversion equipment 8 after washing device 2, changes into CO in conversion equipment 8: h21: 2, purifying with CO and H in a purifying device 92The predominantly shifted gas is passed downstream of the apparatus.
The black water of the washing device 2 is treated by primary water treatment 3 to be relatively clean grey water, the gasified grey water and device condensate are treated by a biochemical treatment system 4, and are mixed with sewage discharged by a circulating water station to be treated by sedimentation 5, after the sedimentation treatment, 50 percent of the reclaimed water is subjected to a salt removing device 10 and is supplemented to a water-cooled wall of a shift converter as desalted water, 50 percent of the reclaimed water is collected into organic water removed from sludge to be used as water supplement of a gasification furnace, and a mud cake discharged from a laminated spiral dehydrator 7 is mixed with superfine pulverized coal to enter the gasification furnace for gasification.
Claims (7)
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 3, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921880039.1U CN211035829U (en) | 2019-11-01 | 2019-11-01 | Sewage and sludge full recovery system of superfine pulverized coal gasification furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921880039.1U CN211035829U (en) | 2019-11-01 | 2019-11-01 | Sewage and sludge full recovery system of superfine pulverized coal gasification furnace |
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| CN211035829U true CN211035829U (en) | 2020-07-17 |
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| CN201921880039.1U Active CN211035829U (en) | 2019-11-01 | 2019-11-01 | Sewage and sludge full recovery system of superfine pulverized coal gasification furnace |
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