Sludge treatment equipment based on blending and co-heating of oily sludge and microalgae

Abstract

The sludge treatment equipment comprises a pyrolysis outer furnace, a pyrolysis inner furnace is fixedly arranged at the top of the inner wall of the pyrolysis outer furnace, a mixing mechanism used for increasing the flowability of pyrolysis sludge containing greasy dirt is fixedly installed on the pyrolysis inner furnace, a spraying and burning frame is fixedly arranged at the bottom of the pyrolysis inner furnace, and the spraying and burning frame is fixedly connected with the pyrolysis inner furnace. According to the sludge treatment equipment based on blending and co-heating of the oily sludge and the microalgae, the sludge is co-heated by utilizing the microalgae cultured by sewage and the oily sludge, the idea of biological carbon sequestration is utilized, and the sludge treatment efficiency is improved. The tail gas generated by the pyrolysis reaction is introduced into the microalgae bioreactor, CO2 in the tail gas is treated, low-carbon emission is achieved, meanwhile, sludge and sewage are subjected to cooperative treatment, and co-heating of microalgae and oily sludge can effectively reduce reaction activation energy, reduce pyrolysis energy consumption and improve the resource recovery rate.

Description

Technical Field

[0001] The utility model relates to the technical field of oily sludge treatment, in particular to sludge treatment equipment based on the co-heating of oily sludge and microalgae. Background Art

[0002] As an important resource, petroleum plays a pillar role in the development of the national economy. The oily sludge generated during oil extraction and processing has always been the "pain of oilfield environmental protection". The generation of oily sludge is an inevitable pollution problem in the petroleum industry. Oily sludge is the oil sludge and oil tank sludge formed by the mixing of oil, water and ground soil during the production and refining of oil and gas fields. Its composition is very complex, containing a large amount of aged crude oil, solid suspended matter and bacterial waste, among which crude oil is the main component. As a new treatment process for sludge treatment, pyrolysis not only has the advantages of significant volume reduction and quantity reduction, but also can effectively recover oil and gas resources in sludge. Compared with direct incineration, it can reduce pollutant emissions while stabilizing the chemical state of heavy metals and improving economic benefits. Studies have pointed out that mixing biomass with sludge for pyrolysis can help improve the particle morphology of sludge, reduce the resistance of pyrolysis reaction, and improve energy recovery efficiency.

[0003] At present, the commonly used pyrolysis treatment equipment for oily sludge on the market is mainly a pyrolysis furnace, in which the oily sludge is pyrolyzed by heating to produce pyrolysis gas, thereby treating the oily sludge; such as the microwave treatment oily sludge equipment with application number CN201820378922.X, in which the conveying device extends into the resonant cavity through the feed port on the upper cover of the resonant cavity, the turntable of the resonant cavity is located below the discharge end of the conveying device and is transmission-connected to the driving mechanism, the waveguide connected to the microwave source extends into the resonant cavity through the microwave feed port of the upper cover, the oil and gas collection mechanism is connected to the oil and gas outlet opened on the upper cover, and the discharge pipe is connected to the discharge port opened on the upper cover. The above-mentioned oily sludge treatment equipment still has the following shortcomings in actual applications:

[0004] The existing pyrolysis treatment equipment for oily sludge has large pyrolysis reaction resistance and high energy consumption. At the same time, there is a problem of large-scale greenhouse gas emissions. Resources cannot be reasonably utilized and it is not energy-saving and environmentally friendly. Utility Model Content

[0005] The utility model aims to provide a sludge treatment device based on the co-heating of oily sludge and microalgae, so as to solve the problem that the resources of the existing oily sludge treatment equipment proposed in the above background technology cannot be reasonably utilized.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sludge treatment equipment based on the co-heating of oil-containing sludge and microalgae, comprising a pyrolysis outer furnace, a pyrolysis inner furnace is fixedly arranged on the top of the inner wall of the pyrolysis outer furnace, a mixing mechanism for increasing the fluidity of the oil-containing pyrolysis sludge is fixedly installed on the pyrolysis inner furnace, a spraying rack is fixedly arranged on the bottom of the pyrolysis inner furnace, a burner is fixedly installed on the bottom of the pyrolysis outer furnace, a combustion exhaust gas conduit is fixedly connected to the top of one side of the pyrolysis outer furnace, a microalgae bioreactor for reducing greenhouse gas emissions is fixedly installed on one end of the combustion exhaust gas conduit, a pyrolysis gas conduit is fixedly connected to the top of the pyrolysis inner furnace, a condensation mechanism for condensing pyrolysis gas is fixedly installed on one end of the pyrolysis gas conduit, a cooling water circulation mechanism for continuous cooling is fixedly installed on one side of the condensation mechanism, and an oil collecting mechanism for collecting condensed pyrolysis gas is fixedly installed on the bottom of the condensation mechanism.

[0007] Preferably, the mixing mechanism includes a mixing motor and a mixing shaft fixedly installed at the output end of the mixing motor, a paddle is fixedly provided at the bottom end of the mixing shaft, and the paddle is arranged inside the pyrolysis inner furnace, an oil sludge filling port extending to the inside of the pyrolysis inner furnace is fixedly provided on one side of the top of the pyrolysis outer furnace, and a slag discharge door extending to the inside of the pyrolysis inner furnace is installed on the front of the pyrolysis outer furnace; the pyrolysis is highly efficient.

[0008] Preferably, the microalgae bioreactor comprises a frame and a tee pipe fixedly installed at the bottom of the frame, both ends of the tee pipe are fixedly connected with a shunt pipe, a plurality of reaction containers are installed on the top of the two shunt pipes, an external discharge pipe is fixedly connected between the plurality of reaction containers on the same side, and the bottom end of the combustion exhaust gas conduit is fixedly connected to the tee pipe; coordinated treatment of sludge and sewage can be achieved.

[0009] Preferably, the reaction container includes a base and a bioreactor fixedly arranged on the top of the base, an upper cover is provided on the top of the bioreactor, a discharge joint is fixedly connected to the middle of the top of the upper cover, a COD monitoring sensor and a carbon dioxide monitor are fixedly installed in the middle of the discharge joint, a pH meter is fixedly installed on the bottom of the inner wall of the upper cover, an air distribution ring pipe is fixedly installed on the bottom of the inner wall of the bioreactor, and the air distribution ring pipe is fixedly installed on the shunt pipe; the emission of carbon dioxide in the exhaust gas can be reduced, which is more environmentally friendly.

[0010] Preferably, the condensation mechanism includes a bracket and two cooling tanks fixedly mounted on the bracket, a connecting pipe is fixedly connected between the two cooling tanks, condensing pipes are fixedly arranged inside the two cooling tanks, the condensing pipes are inclinedly arranged, and the two condensing pipes are fixedly connected; the pyrolysis gas can be diverted and the condensation is efficient.

[0011] Preferably, the oil collecting mechanism includes an oil storage tank and an oil collecting pipe fixedly connected to the top of the oil storage tank, the top of the oil collecting pipe is fixedly connected to the condenser, the bottom of the oil storage tank is fixedly connected to an oil drain pipe, and the middle of the oil drain pipe is fixedly installed with an oil drain valve; the oil droplets in the pyrolysis gas can be collected and collected uniformly for easy management.

[0012] Preferably, the cooling water circulation mechanism includes a cooling water pool and a cooling tower fixedly installed on the top of the cooling water pool, a circulating pump is fixedly installed on one side of the cooling water pool, a water outlet of the circulating pump is fixedly connected to a cooling water pipe, the top end of the cooling water pipe is fixedly connected to one of the cooling tanks, and the bottom end of the other cooling tank is fixedly connected to a return pipe, and one end of the return pipe is fixedly installed at the water inlet of the cooling tower; the circulation of cooling water can be realized, and the condensation effect of the pyrolysis gas can be improved.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The oily sludge treatment equipment uses sewage to cultivate microalgae and oily sludge to co-heat the sludge. It uses the idea of ​​biological carbon fixation to pass the tail gas produced by the pyrolysis reaction into the microalgae bioreactor to treat the CO2 in the tail gas, thereby achieving low-carbon emissions and co-treating the sludge and sewage. The co-heating of microalgae and oily sludge can effectively reduce the reaction activation energy, reduce the pyrolysis energy consumption, and improve the resource recovery rate.

[0015] The condenser can be continuously cooled by the cooling water circulation mechanism. During the entire pyrolysis process, the circulating pyrolysis gas can be continuously cooled and condensed. The oil and gas condensation efficiency is high, and it has the characteristics of low cost, high efficiency, low emissions and rational utilization of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the sludge treatment equipment of the utility model;

[0017] Figure 2 It is a front cross-sectional view of the condensing mechanism of the utility model;

[0018] Figure 3 It is a front cross-sectional view of the pyrolysis furnace of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the microalgae bioreactor of the utility model;

[0020] Figure 5 It is a front cross-sectional view of the reaction container of the utility model.

[0021] In the figure: 1. pyrolysis furnace; 2. cooling tank; 3. microalgae bioreactor; 31. frame; 32. tee pipe; 33. reaction vessel; 331. base; 332. bioreactor; 333. upper cover; 334. air distribution ring pipe; 335. discharge joint; 336. pH meter; 337. COD monitoring sensor; 338. carbon dioxide monitor; 34. shunt pipe; 35. external discharge pipe; 4. oil storage tank; 5. cooling tower ; 6. Cooling water tank; 7. Circulation pump; 8. Reflux pipe; 9. Cooling water pipe; 10. Bracket; 11. Oil collecting pipe; 12. Burner; 13. Slag cleaning door; 14. Combustion exhaust duct; 15. Oil sludge filling port; 16. Mixing motor; 17. Pyrolysis gas duct; 18. Pyrolysis inner furnace; 19. Spraying rack; 20. Mixing shaft; 21. Paddle; 22. Connecting pipe; 23. Condenser; 24. Oil drain valve; 25. Oil drain pipe. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] See also Figure 1-5 The utility model provides a sludge treatment device based on the co-heating of oily sludge and microalgae, comprising a pyrolysis outer furnace 1, a pyrolysis inner furnace 18 is fixedly arranged on the top of the inner wall of the pyrolysis outer furnace 1, a mixing mechanism for increasing the fluidity of the oily pyrolysis sludge is fixedly installed on the pyrolysis inner furnace 18, a spraying rack 19 is fixedly arranged on the bottom of the pyrolysis inner furnace 18, a burner 12 is fixedly installed on the bottom of the pyrolysis outer furnace 1, a combustion exhaust gas conduit 14 is fixedly connected to the top of one side of the pyrolysis outer furnace 1, a microalgae bioreactor 3 for reducing greenhouse gas emissions is fixedly installed on one end of the combustion exhaust gas conduit 14, a pyrolysis gas conduit 17 is fixedly connected to the top of the pyrolysis inner furnace 18, a condensation mechanism for condensing pyrolysis gas is fixedly installed on one end of the pyrolysis gas conduit 17, a cooling water circulation mechanism for continuous cooling is fixedly installed on one side of the condensation mechanism, and an oil collecting mechanism for collecting condensed pyrolysis gas is fixedly installed on the bottom of the condensation mechanism.

[0024] See also Figure 1 and Figure 3 Further, the mixing mechanism includes a mixing motor 16 and a mixing shaft 20 fixedly installed at the output end of the mixing motor 16, a paddle 21 is fixedly provided at the bottom end of the mixing shaft 20, and the paddle 21 is arranged inside the pyrolysis inner furnace 18, an oil sludge filling port 15 extending to the inside of the pyrolysis inner furnace 18 is fixedly provided on one side of the top of the pyrolysis outer furnace 1, and a slag cleaning door 13 extending to the inside of the pyrolysis inner furnace 18 is installed on the front of the pyrolysis outer furnace 1;

[0025] When in use, the dried oily sludge and microalgae are mixed in a ratio of 4:1 and added into the pyrolysis inner furnace 18 through the oily sludge filling port 15. The oily sludge filling port 15 is closed, and the pyrolysis inner furnace 18 is heated by spraying through the burner 12. Heat is transferred through the pyrolysis inner furnace 18 to control the pyrolysis temperature of the oily sludge to be 550°C. During the pyrolysis, the mixing motor 16 drives the paddle 21 to rotate continuously through the mixing shaft 20 to stir the sludge so that it is fully heated. The pyrolysis outer furnace 1 and the pyrolysis inner furnace 18 are separated by a spraying rack 19, and a baffle is arranged inside the spraying rack 19 to improve the heating uniformity.

[0026] See also Figure 1 and Figure 4 Further, the microalgae bioreactor 3 includes a frame 31 and a three-way pipe 32 fixedly installed at the bottom of the frame 31, both ends of the three-way pipe 32 are fixedly connected with a shunt pipe 34, a plurality of reaction containers 33 are installed on the top of the two shunt pipes 34, and an external discharge pipe 35 is fixedly connected between the multiple reaction containers 33 on the same side, and the bottom end of the combustion exhaust gas conduit 14 is fixedly connected to the three-way pipe 32;

[0027] When in use, the combustion exhaust gas generated during the pyrolysis process will enter the three-way pipe 32 through the combustion exhaust gas duct 14, enter the two diversion pipes 34 after being diverted by the three-way pipe 32, and finally be diverted to the reaction container 33. The reaction container 33 is filled with a microalgae solution. The carbon dioxide content in the exhaust gas is reduced through the decomposition of the microalgae, and the purified exhaust gas is discharged through the external exhaust pipe 35.

[0028] See also Figure 1 , Figure 4 and Figure 5 Further, the reaction container 33 includes a base 331 and a bioreactor 332 fixedly arranged on the top of the base 331, an upper cover 333 is arranged on the top of the bioreactor 332, a discharge joint 335 is fixedly connected to the middle of the top of the upper cover 333, a COD monitoring sensor 337 and a carbon dioxide monitor 338 are fixedly installed in the middle of the discharge joint 335, a pH meter 336 is fixedly installed on the bottom of the inner wall of the upper cover 333, an air distribution ring pipe 334 is fixedly installed on the bottom of the inner wall of the bioreactor 332, and the air distribution ring pipe 334 is fixedly installed on the shunt pipe 34;

[0029] When in use, the combustion exhaust gas enters the air distribution ring pipe 334 through the diversion pipe 34, rises from the bottom of the microalgae solution, and the exhaust gas mixes with the microalgae solution. Microalgae are photosynthetic autotrophic organisms. The microalgae cells contain chloroplasts, which can efficiently utilize carbon dioxide and light energy to release oxygen and synthesize organic matter to achieve photosynthetic carbon fixation, which can eliminate COD in sewage and play a role in sewage purification and emission reduction.

[0030] See also Figure 1 and Figure 2Further, the condensing mechanism includes a bracket 10 and two cooling tanks 2 fixedly mounted on the bracket 10, a connecting pipe 22 is fixedly connected between the two cooling tanks 2, and condensing pipes 23 are fixedly arranged inside the two cooling tanks 2, the condensing pipes 23 are inclinedly arranged, and the two condensing pipes 23 are fixedly connected;

[0031] When in use, the pyrolysis gas generated by the pyrolysis inner furnace 18 will enter the condenser 23 through the pyrolysis gas conduit 17, and will flow in the condenser 23 in a baffled manner. Since cooling water flows in the cooling tank 2, the pyrolysis gas will be condensed.

[0032] See also Figure 1 and Figure 2 Further, the oil collecting mechanism includes an oil storage tank 4 and an oil collecting pipe 11 fixedly connected to the top of the oil storage tank 4, the top of the oil collecting pipe 11 is fixedly connected to the condenser 23, the bottom of the oil storage tank 4 is fixedly connected to an oil drain pipe 25, and an oil drain valve 24 is fixedly installed in the middle of the oil drain pipe 25;

[0033] During use, since the condenser tube 23 is arranged at an angle, the condensed oil droplets will flow along the condenser tube 23 under the action of gravity, and finally enter the oil storage tank 4 through the oil collecting pipe 11 for centralized collection.

[0034] See also Figure 1 and Figure 2 , further, the cooling water circulation mechanism includes a cooling water pool 6 and a cooling tower 5 fixedly installed on the top of the cooling water pool 6, a circulating pump 7 is fixedly installed on one side of the cooling water pool 6, the water outlet of the circulating pump 7 is fixedly connected to a cooling water pipe 9, the top of the cooling water pipe 9 is fixedly connected to one of the cooling tanks 2, and the bottom of the other cooling tank 2 is fixedly connected to a return pipe 8, and one end of the return pipe 8 is fixedly installed at the water inlet of the cooling tower 5;

[0035] When in use, during the pyrolysis period, the circulation pump 7 will continuously draw cooling water from the cooling water pool 6, fill it into the upper cooling tank 2 through the cooling water pipe 9, flow in the opposite direction to the pyrolysis gas in the cooling tank 2, enter the cooling tank 2 below through the connecting pipe 22, and finally enter the cooling tower 5 through the reflux pipe 8. After being cooled by the cooling tower 5, the cooling water flows back to the cooling water pool 6 to realize the circulation of cooling water.

[0036] When used, the embodiments of the present application: utilize microalgae and oily sludge for co-heat treatment to reduce the reaction activation energy, utilize sewage to cultivate microalgae, and while reducing the cost of microalgae cultivation, purify the sewage, thereby achieving the coordinated treatment of sewage and sludge, and utilize the idea of ​​biological carbon fixation to reduce the carbon dioxide concentration in the exhaust gas generated during the treatment process, thereby reducing the carbon dioxide concentration in the exhaust gas to less than 40% of the original, thereby achieving low-carbon emissions.

[0037] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sludge treatment device based on the co-heating of oily sludge and microalgae, comprising a pyrolysis outer furnace (1), characterized in that: A pyrolysis inner furnace (18) is fixedly arranged on the top of the inner wall of the pyrolysis outer furnace (1), and a mixing mechanism for increasing the fluidity of the oil-containing pyrolysis mud is fixedly installed on the pyrolysis inner furnace (18). A spraying rack (19) is fixedly arranged on the bottom of the pyrolysis inner furnace (18). A burner (12) is fixedly installed on the bottom of the pyrolysis outer furnace (1). A combustion exhaust gas conduit (14) is fixedly connected to the top of one side of the pyrolysis outer furnace (1), and a microalgae bioreactor (3) for reducing greenhouse gas emissions is fixedly installed on one end of the combustion exhaust gas conduit (14). A pyrolysis gas conduit (17) is fixedly connected to the top of the pyrolysis inner furnace (18), and a condensing mechanism for condensing pyrolysis gas is fixedly installed on one end of the pyrolysis gas conduit (17). A cooling water circulation mechanism for continuous cooling is fixedly installed on one side of the condensing mechanism, and an oil collecting mechanism for collecting condensed pyrolysis gas is fixedly installed on the bottom of the condensing mechanism.

2. The sludge treatment equipment based on mixing and heating oily sludge and microalgae according to claim 1 is characterized by: The mixing mechanism comprises a mixing motor (16) and a mixing shaft (20) fixedly mounted on the output end of the mixing motor (16); a paddle (21) is fixedly mounted on the bottom end of the mixing shaft (20); the paddle (21) is arranged inside the pyrolysis inner furnace (18); an oil sludge filling port (15) extending into the pyrolysis inner furnace (18) is fixedly mounted on one side of the top end of the pyrolysis outer furnace (1); and a slag discharge door (13) extending into the pyrolysis inner furnace (18) is mounted on the front of the pyrolysis outer furnace (1).

3. The sludge treatment equipment based on mixing and heating oily sludge and microalgae according to claim 1 is characterized by: The microalgae bioreactor (3) comprises a frame (31) and a three-way pipe (32) fixedly mounted at the bottom of the frame (31); both ends of the three-way pipe (32) are fixedly connected to a shunt pipe (34); a plurality of reaction containers (33) are mounted on the top of the two shunt pipes (34); an external discharge pipe (35) is fixedly connected between the plurality of reaction containers (33) on the same side; and the bottom end of the combustion exhaust gas conduit (14) is fixedly connected to the three-way pipe (32).

4. The sludge treatment equipment based on mixing and heating oily sludge and microalgae according to claim 3 is characterized by: The reaction container (33) comprises a base (331) and a bioreactor (332) fixedly arranged at the top of the base (331); an upper cover (333) is arranged at the top of the bioreactor (332); a discharge joint (335) is fixedly connected to the middle of the top of the upper cover (333); a COD monitoring sensor (337) and a carbon dioxide monitor (338) are fixedly installed at the middle of the discharge joint (335); a pH meter (336) is fixedly installed at the bottom of the inner wall of the upper cover (333); an air distribution ring tube (334) is fixedly installed at the bottom of the inner wall of the bioreactor (332); and the air distribution ring tube (334) is fixedly installed on the shunt pipe (34).

5. The sludge treatment equipment based on mixing and heating oily sludge and microalgae according to claim 1 is characterized by: The condensation mechanism comprises a bracket (10) and two cooling tanks (2) fixedly mounted on the bracket (10); a connecting pipe (22) is fixedly connected between the two cooling tanks (2); condensation pipes (23) are fixedly arranged inside the two cooling tanks (2); the condensation pipes (23) are inclinedly arranged; and the two condensation pipes (23) are fixedly connected.

6. The sludge treatment equipment based on mixing and heating oily sludge and microalgae according to claim 5 is characterized by: The oil collecting mechanism comprises an oil storage tank (4) and an oil collecting pipe (11) fixedly connected to the top of the oil storage tank (4); the top of the oil collecting pipe (11) is fixedly connected to a condenser pipe (23); the bottom of the oil storage tank (4) is fixedly connected to an oil drain pipe (25); and an oil drain valve (24) is fixedly installed in the middle of the oil drain pipe (25).

7. The sludge treatment equipment based on mixing and heating oily sludge and microalgae according to claim 5 is characterized by: The cooling water circulation mechanism comprises a cooling water pool (6) and a cooling tower (5) fixedly mounted on the top of the cooling water pool (6); a circulation pump (7) is fixedly mounted on one side of the cooling water pool (6); a water outlet of the circulation pump (7) is fixedly connected to a cooling water pipe (9); the top end of the cooling water pipe (9) is fixedly connected to one of the cooling tanks (2); the bottom end of the other cooling tank (2) is fixedly connected to a return pipe (8); one end of the return pipe (8) is fixedly mounted on the water inlet of the cooling tower (5).

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