Biochemical sludge recovery treatment system

Abstract

The utility model belongs to the technical field of sludge treatment, and relates to a biochemical sludge recovery treatment system which comprises a biochemical sludge tank, a slurry pump, a coal mill, a gasification furnace and a water scrubber which are communicated in sequence, the gasification furnace is also externally connected with an oxygen pipeline communicated with the interior of the gasification furnace; a coal slurry storage tank is also arranged between the coal mill and the gasification furnace; and a coal slurry pump is also arranged between the coal slurry storage tank and the gasification furnace. Biochemical sludge is introduced into the coal mill through the slurry pump to replace existing water and coal slurry viscosity reducers, then enters the gasification furnace to be converted into carbon monoxide and hydrogen, and then is subjected to water washing and recycling treatment, so that the treatment cost is reduced, and no pollution is generated.

Description

Technical Field

[0001] The utility model belongs to the technical field of sludge treatment, and relates to a biochemical sludge recovery and treatment system. Background Art

[0002] Biochemical sludge is the sludge produced after treating sewage by microorganisms in domestic sewage during the sewage treatment process; the main components of biochemical sludge include clay, heavy metals, organic matter, and various microorganisms. The content of these organic matters is relatively high, and the existence of a large number of microorganisms among them will cause greater pollution if directly discharged.

[0003] At present, the traditional biochemical sludge treatment technologies mainly include landfill, incineration and other treatment methods. Landfill is used to treat chemical surplus sludge, but due to the presence of various organic poisons, pathogenic bacteria and parasites (eggs) in the sludge, landfill is prone to secondary pollution, and composting occupies a large amount of farmland; incineration is prone to generate dioxin with strong carcinogenic effects, and the water content of biochemical sludge is about 40%, so the incineration cost is high and enterprises can hardly bear it. In addition, there are other treatment methods. For example, the Chinese patent document with the publication number of CN117303685A discloses a device and method for treating biochemical sludge by using wastewater, including a neutralization tank, a neutralization sedimentation tank, a biochemical tank and a biochemical sedimentation tank that are connected in sequence. The output end of the biochemical sedimentation tank is also connected to the neutralization tank. The biochemical sludge is refluxed to the neutralization tank to react with acid water, making full use of the alkalinity and calcium carbonate in the sludge, which not only saves the addition of lime but also reduces the generation of sludge. However, the existing biochemical sludge treatment cost is high, and the treated sludge still has the defect of polluting the environment and cannot meet the actual treatment requirements. Content of the Utility Model

[0004] In view of the technical problems of high cost and environmental pollution existing in the existing biochemical sludge treatment, the utility model provides a biochemical sludge recovery and treatment system.

[0005] The utility model uses a slurry pump to introduce biochemical sludge into a coal mill to replace the existing water and coal slurry viscosity reducer, and then enters a gasifier to convert the biochemical sludge into carbon monoxide and hydrogen, and then performs water washing and recovery treatment to achieve deep processing, reduce the treatment cost and produce no pollution.

[0006] In order to achieve the above purpose, the technical scheme adopted by the utility model is:

[0007] A biochemical sludge recovery and treatment system includes a biochemical sludge tank, a slurry pump, a coal mill, a gasifier and a water washing tower that are connected in sequence; an oxygen pipeline connected to the inside of the gasifier is also externally connected to the gasifier.

[0008] Further defined, a coal slurry storage tank is also arranged between the coal mill and the gasifier.

[0009] Further defined, a coal slurry pump is also provided between the coal slurry storage tank and the gasifier.

[0010] Further defined, a gasifier outlet and a gasifier return port are respectively provided on the gasifier; the gasifier return port is located above the gasifier outlet, the gasifier outlet is communicated with the middle part of the water scrubber, and the lower side of the water scrubber is communicated with the gasifier return port.

[0011] Further defined, a syngas outlet, a water scrubber inlet and a water scrubber outlet are sequentially opened on the side wall of the water scrubber from top to bottom; the water scrubber inlet is communicated with the gasifier outlet, and the water scrubber outlet is communicated with the gasifier return port.

[0012] Further defined, a cyclone separator is also provided between the gasifier outlet and the water scrubber.

[0013] Further defined, a mixer is also provided between the gasifier outlet and the cyclone separator; the mixer is also communicated with the water scrubber outlet.

[0014] Further defined, the biochemical sludge recovery and treatment system further includes an evaporation hot water tower communicated with the gasifier; the evaporation hot water tower is also respectively communicated with the water scrubber and the cyclone separator.

[0015] Further defined, the biochemical sludge recovery and treatment system further includes a lock hopper located below the gasifier and communicated with the bottom of the gasifier.

[0016] The beneficial effects of the present utility model are as follows: The present utility model converts the toxic organic substances in the biochemical sludge into effective components such as carbon monoxide and hydrogen, saves the process and treatment costs of dehydrating the biochemical sludge, greatly reduces the treatment cost, and realizes environmental protection. The specific manifestations are as follows:

[0017] 1. The present utility model uses a slurry pump to introduce the biochemical sludge into the coal mill, replaces the existing water and coal slurry viscosity reducers, and then enters the gasifier to convert the biochemical sludge into carbon monoxide and hydrogen for deep processing, reducing the treatment cost and generating no pollution.

[0018] 2. In the present utility model, since the biochemical sludge is all organic network molecules, it can effectively complex the coal powder particles, thereby reducing the viscosity of the coal slurry without changing the concentration. Therefore, the biochemical sludge, as a substitute for the coal slurry viscosity reducer, well reduces the viscosity of the coal slurry (the viscosity is reduced from more than 1000 MPA.S to more than 300 MPA.S). The content of organic substances in the solids of the biochemical sludge accounts for 80%, which can effectively increase the concentration of the coal slurry (the concentration of the coal slurry is increased from 58% to 60%), realizing the effective utilization of the biochemical sludge.

[0019] 3. In the present utility model, a gasifier outlet and a gasifier return port are respectively arranged on the gasifier; the gasifier return port is located above the gasifier outlet, the gasifier outlet is communicated with the gasifier return port after passing through a water washing tower, a mixer is further arranged between the gasifier outlet and the cyclone separator, and the mixer is also communicated with the water washing tower; the evaporation hot water tower is also respectively communicated with the gasifier and the water washing tower, and the ash water generated by water washing and the ash water generated by the gasifier are sent into the evaporation hot water tower to be heated and raised in temperature and then used as the washing water of the water washing tower, so as to realize resource recycling and save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the biochemical sludge recovery and treatment system provided by the present utility model;

[0021] Wherein:

[0022] 1 - biochemical sludge tank; 2 - slurry pump; 3 - coal mill; 4 - coal slurry storage tank; 5 - coal slurry pump; 6 - gasifier; 601 - gasifier inlet; 602 - gasifier return port; 603 - gasifier outlet; 604 - gasifier ash water outlet; 7 - lock hopper; 8 - mixer; 9 - cyclone separator; 10 - water washing tower; 1001 - syngas outlet; 1002 - water washing tower inlet; 1003 - water washing tower outlet; 1004 - condensate inlet; 1005 - water washing inlet; 11 - evaporation hot water tower. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model.

[0024] Embodiment

[0025] Refer to Figure 1 , this embodiment provides a biochemical sludge recovery and treatment system, which includes a biochemical sludge tank 1, a slurry pump 2, a coal mill 3, a gasifier 6 and a water washing tower 10 that are connected in sequence; an oxygen pipeline communicated with the inside of the gasifier 6 is also externally connected to the gasifier 6.

[0026] In this embodiment, a coal slurry storage tank 4 is further arranged between the coal mill 3 and the gasifier 6.

[0027] In this embodiment, a coal slurry pump 5 is further arranged between the coal slurry storage tank 4 and the gasifier 6.

[0028] In this embodiment, the biochemical sludge recovery and treatment system further includes a lock hopper 7 located below the gasifier 6 and communicated with the gasifier 6.

[0029] In this embodiment, the biochemical sludge is introduced into the coal mill 3 through the slurry pump 2 to replace the existing water and coal slurry viscosity reducer. The coal mill 3 mixes and grinds coal and biochemical sludge to form coal slurry (containing coal, organic matter and water). The coal slurry enters the coal slurry storage tank 4 for storage, and then enters the gasifier 6 through the coal slurry pump 5. At the same time, oxygen is introduced into the gasifier 6 through the oxygen pipeline. At a high temperature of 1200 °C, coal, organic matter and water are decomposed into carbon monoxide, hydrogen and carbon dioxide. After mixing, these three gases enter the water washing tower 10 for further treatment. The coal slag enters the lock hopper 7 from the bottom of the gasifier 6 and is discharged; realizing the deep processing of biochemical sludge, thereby reducing the treatment cost and generating no pollution.

[0030] In this embodiment, the gasifier 6 is respectively provided with a gasifier inlet 601, a gasifier return port 602, a gasifier outlet 603 and a gasifier ash water outlet 604; the gasifier inlet 601 is connected to the coal slurry pump 5 for feeding the coal slurry into the gasifier 6, and at the same time, oxygen is introduced into the gasifier inlet 601, so that the coal slurry and oxygen are mixed and then enter the gasifier 6 for reaction; the gasifier ash water outlet 604 discharges the return ash water generated by the gasifier 6; the gasifier outlet 603 mainly discharges the synthesis gas generated by the gasifier 6 to the water washing tower 10 for water washing and purification.

[0031] Preferably, the gasifier inlet 601, the gasifier return port 602, the gasifier outlet 603 and the gasifier ash water outlet 604 are arranged on the furnace wall of the gasifier 6 in sequence from top to bottom.

[0032] Preferably, the gasifier 6 is a high-temperature regenerative non-catalytic reactor.

[0033] In this embodiment, the water washing tower 10 is successively provided with a synthesis gas outlet 1001, a condensate inlet 1004, a water washing inlet 1005, a water washing tower inlet 1002 and a water washing tower outlet 1003 from top to bottom; the water washing tower inlet 1002 is connected to the gasifier outlet 603 to introduce the synthesis gas from the gasifier into the water washing tower 10; the water washing inlet 1005 is used to supply washing water (ash water) to the water washing tower 10; the condensate inlet 1004 is used to supply condensate water to the water washing tower 10; the synthesis gas outlet 1001 is used to discharge the washed synthesis gas; the water discharged from the water washing tower outlet 1003 returns to the gasifier through the gasifier return port 602, and the other part is mixed with the synthesis gas discharged from the gasifier outlet 603 and then enters the washing tower 10.

[0034] In this embodiment, a cyclone separator 9 is further arranged between the gasifier outlet 603 and the water washing tower 10. A mixer 8 is further arranged between the gasifier outlet 603 and the cyclone separator 9; the mixer 8 is also connected to the water washing tower 10.

[0035] See Figure 1, the feed end elbow structure of the mixer 8. Specifically, the left side of the mixer 8 is a downward elbow. The washing liquid returned from the water washing tower 10 enters vertically upward from below, and the syngas enters horizontally from left to right, making the mixing of the syngas and the washing water more uniform and facilitating subsequent separation.

[0036] In this embodiment, the biochemical sludge recovery and treatment system further includes an evaporation hot water tower 11 communicated with the gasifier 6; the evaporation hot water tower 11 is also communicated with the water washing tower 10.

[0037] In this embodiment, the mixer 8 is respectively connected to the gasifier outlet 603 and the water washing tower outlet 1003, which mixes the syngas discharged from the gasifier 6 with the washing liquid discharged from the water washing tower 10; then it enters the cyclone separator 9. Through cyclone separation, the liquid water and solid particles are separated from the syngas. Then the liquid water and solid particles pass through the evaporation hot water tower 11 from the bottom of the cyclone separator 9. The syngas comes out from the top of the cyclone separator 9 and enters the water washing tower 10 through the water washing tower inlet 1002 for water washing. The water used for water washing is the ash water heated and evaporated from the evaporation hot water tower 11, that is, the ash water at 50°C first enters the evaporation hot water tower 11 and is heated to 160°C and is used for washing the syngas after washing; at the same time, condensate is also introduced into the water washing tower 10 through the condensate inlet 1004, so that the temperature of the syngas drops from 330°C to 230°C. After the washing is completed, the purified syngas is discharged and collected from the syngas outlet 1001 as the raw material for synthesizing methanol.

[0038] During implementation, the washing water coming out from the bottom of the water washing tower 10 returns to the gasifier 6 through the water washing tower outlet 1003. This is because the temperature of the washing water is 230°C, which can cool and wash the inside of the gasifier 6 and realize resource reuse; at the same time, since the washing water dissolves saturated gases such as CO, it is not easy to scale, and the dissolved saturated gas will not dissolve the syngas in the gasifier 6, ensuring the safe and stable operation of the gasifier 6; the washing water also enters the mixer 8 through the water washing tower outlet 1003 and mixes with the syngas coming out from the gasifier outlet 603, facilitating the subsequent separation of solid particles from the syngas.

[0039] During implementation, concentrated black water will be generated at the bottom of the evaporation hot water tower 11. After being sent out of the system and undergoing subsequent flash evaporation, cooling, vacuum pumping, etc., the solid particles are separated, and the obtained condensate can enter the water washing tower 10 from the condensate inlet 1004 as washing water.

[0040] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are similarly included in the patent protection scope of the present invention.

Claims

1. A biochemical sludge recovery and treatment system, characterized in that: It comprises a biochemical sludge pool (1), a slurry pump (2), a coal mill (3), a gasifier (6) and a water scrubber (10) which are connected in sequence; the gasifier (6) is also externally connected to an oxygen pipeline which is connected to the inside of the gasifier (6).

2. The biochemical sludge recovery and treatment system according to claim 1 is characterized in that: A coal slurry storage tank (4) is also provided between the coal mill (3) and the gasifier (6).

3. The biochemical sludge recovery and treatment system according to claim 2 is characterized in that: A coal slurry pump (5) is also provided between the coal slurry storage tank (4) and the gasifier (6).

4. The biochemical sludge recovery and treatment system according to claim 3 is characterized in that: The gasifier (6) is provided with a gasifier outlet (603) and a gasifier return port (602), respectively; the gasifier return port (602) is located above the gasifier outlet (603), the gasifier outlet (603) is connected to the middle part of the water scrubber (10), and the lower part of the water scrubber (10) is connected to the gasifier return port (602).

5. The biochemical sludge recovery and treatment system according to claim 4 is characterized in that: The side wall of the water scrubber (10) is provided with a synthesis gas outlet (1001), a water scrubber inlet (1002) and a water scrubber outlet (1003) in sequence from top to bottom; the water scrubber inlet (1002) is connected to the gasifier outlet (603), and the water scrubber outlet (1003) is connected to the gasifier return port (602).

6. The biochemical sludge recovery and treatment system according to claim 5, characterized in that: A cyclone separator (9) is also provided between the gasification furnace outlet (603) and the water washing tower (10).

7. The biochemical sludge recovery and treatment system according to claim 6, characterized in that: A mixer (8) is also provided between the gasification furnace outlet (603) and the cyclone separator (9); the mixer (8) is also connected to the water washing tower outlet (1003).

8. The biochemical sludge recovery and treatment system according to claim 7, characterized in that: The biochemical sludge recovery and treatment system also includes an evaporation hot water tower (11) connected to the gasification furnace (6); the evaporation hot water tower (11) is also connected to the water washing tower (10) and the cyclone separator (9) respectively.

9. The biochemical sludge recovery and treatment system according to any one of claims 1 to 8, characterized in that: The biochemical sludge recovery and treatment system further comprises a lock hopper (7) located below the gasifier (6) and connected to the bottom of the gasifier (6).

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