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CN-111943473-B - Continuous supercritical water oxidation system for treating oily sludge

CN111943473BCN 111943473 BCN111943473 BCN 111943473BCN-111943473-B

Abstract

The invention provides a continuous supercritical water oxidation system for treating oily sludge, which comprises a muddy water mixed feeding system, a supercritical oxidation system and an energy recovery system. When the whole system is started initially, the fuel in the reaction inclined tube is ignited by utilizing the heat of the glow plug, a fuel preheater is not needed, the rapid preheating and the efficient degradation of the organic waste liquid are realized, and the investment and the energy consumption of equipment are reduced. Through adjusting the switch of the first electric ball valve and the second electric ball valve, the mixing of the oil sludge and the clear water/organic wastewater and the continuous feeding of the mud water are realized. The muddy water reacts with the high-pressure oxidizing agent which is not preheated in the reaction inclined tube, and the automatic salt discharge can be realized by adjusting the switch of the third electric ball valve and the fourth electric ball valve, so that the generation of salt-containing sewage is avoided, the continuous operation and zero discharge of the reactor are facilitated, and the industrial treatment requirement is met.

Inventors

  • HU DEDONG
  • Yang Sangyu
  • HAN JUNJIE
  • Tan Futing

Assignees

  • 青岛科技大学

Dates

Publication Date
20260508
Application Date
20200917

Claims (6)

  1. 1. A continuous supercritical water oxidation system for treating oily sludge is characterized by comprising a muddy water mixed feeding system, a supercritical oxidation system and an energy recovery system, The mud-water mixing feeding system consists of a first booster pump (1), a first one-way valve (2), a jet mixer (3), an oil sludge tank (4), a first electric ball valve (5), a mixing pipe (6), a second electric ball valve (7), a mixing tank (8) and a second one-way valve (9), wherein the oil sludge tank (4) consists of an oil sludge tank body (4-1) and a sludge discharge port (4-2), the mixing tank (8) consists of a mixing tank body (8-1), a water inlet (8-2), a water outlet (8-3) and a mud water discharge port (8-4), The inlet of the first booster pump (1) is the inlet of clear water or organic wastewater, the outlet of the first booster pump (1) is connected with the inlet of the first one-way valve (2) through a pipeline, the outlet of the first one-way valve (2) is connected with the inlet of working fluid at the left end of the jet mixer (3) through a pipeline, the outlet of mixed fluid at the right end of the jet mixer (3) is connected with the water inlet (8-2) of the mixing tank (8) through a pipeline, the sludge outlet (4-2) of the sludge tank (4) is connected with the inlet of the first electric ball valve (5) through a flange, the outlet of the first electric ball valve (5) is connected with the inlet of the mixing pipe (6) through a flange, the outlet of the mixing pipe (6) is connected with the inlet of the second electric ball valve (7) through a flange, the outlet of the second electric ball valve (7) is connected with the water outlet (8-3) of the mixing tank (8) through a flange, and the sludge outlet (8-4) of the mixing tank (8) is connected with the inlet of the second one-way valve (9) through a pipeline; The supercritical water oxidation system consists of an ignition area, a reaction area and a separation area, the core device of the supercritical water oxidation system is a supercritical water oxidation reactor (10), the supercritical water oxidation reactor (10) consists of an inclined tube end cover (10-1), a feed inlet (10-2), a first oxidant inlet (10-3), a reaction inclined tube (10-4), a T-shaped porous lining tube (10-5), an inclined tube boss (10-6), a second oxidant inlet (10-7), a separation straight tube (10-8), a straight tube end cover (10-9), an exhaust port (10-10), a third electric ball valve (10-11), a mud discharging tube (10-12) and a fourth electric ball valve (10-13), Wherein the ignition area consists of a second booster pump (11), a first stop valve (12), a third one-way valve (13), an inclined tube end cover (10-1), a feed inlet (10-2), an oxidant supercharging device (14), a second stop valve (15), a first oxidant inlet (10-3) and a glow plug (16), The inlet of the second booster pump (11) is a fuel inlet, the outlet of the second booster pump (11) is connected with the inlet of the first stop valve (12) through a pipeline, the outlet of the first stop valve (12) is connected with the inlet of the third check valve (13) through a pipeline, the upper end of the inclined tube end cover (10-1) is provided with a feed inlet (10-2) and a first oxidant inlet (10-3), the outlet of the third check valve (13) is connected with the feed inlet (10-2) through a pipeline, the inlet of the oxidant supercharging device (14) is an oxidant inlet, the outlet of the oxidant supercharging device (14) is connected with the inlet of the second stop valve (15), the outlet of the second stop valve (15) is connected with the first oxidant inlet (10-3) through a pipeline, the electric heating plug (16) is connected at the center of the inclined tube end cover (10-1) through threads, The reaction zone comprises a second one-way valve (9), a third one-way valve (13), an inclined tube end cover (10-1), a feed inlet (10-2), an oxidant supercharging device (14), a second stop valve (15), a first oxidant inlet (10-3), a reaction inclined tube (10-4), a T-shaped porous lining tube (10-5), an inclined tube boss (10-6), a third stop valve (17) and a second oxidant inlet (10-7) The composition of the composite material comprises the components, The outlet of the second one-way valve (9) is connected with the feed inlet (10-2) after being connected with the outlet of the third one-way valve (13) in parallel through a pipeline, the inclined tube end cover (10-1) is arranged at the upper end of the reaction inclined tube (10-4), a T-shaped porous inner liner tube (10-5) is arranged in the reaction inclined tube (10-4), the upper end of the T-shaped porous inner liner tube (10-5) is a convex end, an inclined tube boss (10-6) is arranged at the inner side of the reaction inclined tube (10-4) and used for fixing the T-shaped porous inner liner tube (10-5), the inlet of the third stop valve (17) is connected with the oxidant supercharging device (14) after being connected with the inlet of the second stop valve (15) through a pipeline, the outlet of the third stop valve (17) is connected with the second oxidant inlet (10-7) through a pipeline, The separation zone consists of a separation straight pipe (10-8), a straight pipe end cover (10-9), an exhaust port (10-10), a third electric ball valve (10-11), a mud discharging pipe (10-12), a fourth electric ball valve (10-13), a back pressure valve (18) and a flash tank (19), The upper end of the separation straight pipe (10-8) is provided with a straight pipe end cover (10-9), the center of the straight pipe end cover (10-9) is provided with an exhaust port (10-10), the lower end of the separation straight pipe (10-8) is connected with an inlet of a third electric ball valve (10-11) through a flange, an outlet of the third electric ball valve (10-11) is connected with an inlet of a mud discharging pipe (10-12) through a flange, an outlet of the mud discharging pipe (10-12) is connected with an inlet of a fourth electric ball valve (10-13) through a flange, an outlet of the fourth electric ball valve (10-13) is connected with an inlet of a back pressure valve (18) through a pipeline, an outlet of the back pressure valve (18) is connected with an inlet of a flash tank (19) through a pipeline, the top end of the flash tank (19) is a gas phase exhaust port, and the bottom of the flash tank (19) is a solid phase exhaust port; The reaction inclined tube (10-4) is welded with the separation straight tube (10-8) at a certain inclination angle, and an opening for inserting the T-shaped porous lining tube (10-5) is arranged in the middle of the separation straight tube (10-8) so as to ensure that products in the reaction inclined tube (10-4) flow into the separation straight tube (10-8); The energy recovery system comprises a heat exchanger (20), a gas-liquid separator (21), a buffer tank (22), an expander (23), a generator (24), a fourth one-way valve (25) and an injection mixer (3), wherein a tube side inlet of the heat exchanger (20) is connected with an exhaust port (10-10) of the supercritical water oxidation system through a pipeline, a tube side outlet of the heat exchanger (20) is connected with an inlet of the gas-liquid separator (21) through a pipeline, shell side fluid of the heat exchanger (20) is cooling water and is used for producing high-temperature steam, a gas phase outlet of the gas-liquid separator (21) is connected with an inlet of the buffer tank (22) through a pipeline, an outlet of the buffer tank (22) is connected with an inlet of the expander (23) through a pipeline, the expander (23) is connected with the generator (24) through a transmission shaft, a liquid phase outlet of the gas-liquid separator (21) is connected with an inlet of the fourth one-way valve (25) through a pipeline, and a gas phase outlet of the fourth one-way valve (25) is connected with an inlet of the injection mixer (3) through an outlet of the fourth one-way valve.
  2. 2. A continuous supercritical water oxidation system for treating oily sludge according to claim 1 wherein: The highest working pressure of each component in an ignition zone, a reaction zone and a separation zone of the supercritical water oxidation system is 30MPa, wherein the highest working temperature of a T-shaped porous lining pipe (10-5) in the reaction zone is 1200 ℃, and the highest working temperature of the other components in the reaction zone and the separation zone is 700 ℃.
  3. 3. A continuous supercritical water oxidation system for treating oily sludge according to claim 1 wherein: The oxidant supercharging device (14) is a plunger pump or a compressor.
  4. 4. A continuous supercritical water oxidation system for treating oily sludge according to claim 1 wherein the T-shaped porous liner tube (10-5) is made of one of zirconia, alumina, and silicon carbide.
  5. 5. A continuous supercritical water oxidation system for treating oily sludge according to claim 1 wherein the oxidizing agent is selected from one of air, oxygen, hydrogen peroxide, KClO3 solution, KMnO4 solution.
  6. 6. A continuous supercritical water oxidation system for treating oily sludge according to claim 1 wherein the fuel is selected from one of gasoline, kerosene, methanol, ethanol.

Description

Continuous supercritical water oxidation system for treating oily sludge Technical Field The invention relates to the field of supercritical water oxidation, in particular to a continuous supercritical water oxidation system for treating oily sludge. Background The oil-containing sludge is mainly generated in oil fields and refineries, and the oil exploration and development industry is taken as an example, and the generated amount is 0.5% -1% of the crude oil yield. According to the current crude oil yield estimation in China, almost millions of tons of oil sludge and oil sand are produced each year, and if the 'three sludge' produced by petrochemical industry is added, the total amount is much larger. The oily sludge enters the surface soil and water body to cause serious pollution problems, so that the oily sludge needs to be effectively treated before being discharged. At present, the treatment of the oil sludge is less in literature report, and the method mainly adopted is still an incineration method, but a dust removal and gas recovery device is required to be arranged during incineration, otherwise serious atmospheric pollution can be generated. In addition, a low-temperature pyrolysis method, a dissolution washing method and a microorganism treatment method are adopted, but the two methods are complex in process method, secondary pollution is generated to the environment, microorganisms have certain selectivity to oil products, and application conditions are severe and are not mature at present. Supercritical water oxidation (SCWO) technology refers to advanced oxidation technology for degrading organic matters into harmless small molecules such as CO2, N2 and H2O under the conditions of 23-30 mpa and 400-600 ℃ by taking supercritical water as a reaction medium and taking air, O2 or H2O2 as an oxidant, wherein Cl, P and S are usually converted into corresponding acids or separated out by inorganic salts, SCWO technology is regarded as the most promising key technology for waste treatment in the fields of energy and environment in the united states, and although application foundation has already been formed, there are some SCWO industrial devices at home and abroad, the problems of corrosion, salt deposition and high running cost of the reactor have hindered the industrialized popularization of the technology. The supercritical water oxidation device with the patent number of CN104291546A can be used for treating municipal sludge, the main body consists of an inclined tube reactor which is obliquely arranged and a straight tube separator which is vertically arranged, waste materials which are preheated to 200 ℃ are mixed with an oxidant and supercritical water with the temperature of 500-600 ℃ and then enter the inclined tube for reaction, a porous inner liner tube is arranged in the inclined tube, a protective film is formed on the inner surface of the inner liner tube by boundary fluid, solid particles are prevented from being deposited on the inner wall of the reactor, corrosion and salt deposition of reaction products on the inclined tube are reduced, the inner wall temperature of the inclined tube (10-4) is reduced, the safe operation of equipment is ensured, and the material requirement of the equipment is reduced. The product is subjected to solid-liquid separation in the separator through gravity sedimentation, and the cooling water neutralizes and cools the product and simultaneously dissolves and discharges solid particles at the bottom of the separator. However, as the reaction proceeds, supercritical water at 500-600 ℃ is continuously introduced into the device, so that the problem of high operation cost exists, secondary pollution is generated after solid particles are dissolved and discharged, zero emission cannot be realized, and continuous operation of the device is not facilitated. At present, in order to solve the problem of preheating materials, a supercritical water oxidation reactor with the patent number of CN102190363A using auxiliary fuel to supply heat is provided with a fuel heating method, and the heat required by auxiliary fuel supply reaction is utilized, so that the materials, the fuel and the oxidant (air or oxygen) are efficiently mixed through jet flows in different directions to improve the oxidation efficiency. However, the device is difficult to ignite, and a preheater is required before the device enters the reactor together with the oxidant, so that the problem of high operation cost still exists. Disclosure of Invention Aiming at the problems, the invention provides a continuous supercritical water oxidation system for treating oil-containing sludge, which solves the problems of high running cost during preheating of system materials and secondary pollution during salt discharge of a reactor. The technical scheme of the invention is as follows: a continuous supercritical water oxidation system for treating oily sludge comprises a muddy water mixed feeding syst