CN114477687A - Supercritical water oxidation system - Google Patents
Supercritical water oxidation system Download PDFInfo
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- CN114477687A CN114477687A CN202210129253.3A CN202210129253A CN114477687A CN 114477687 A CN114477687 A CN 114477687A CN 202210129253 A CN202210129253 A CN 202210129253A CN 114477687 A CN114477687 A CN 114477687A
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- cavity
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- tail gas
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- water oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/008—Processes carried out under supercritical conditions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention provides a supercritical water oxidation system, and relates to the technical field of environmental protection. The system comprises a pretreatment cavity, a reaction cavity and a heat exchanger; the pretreatment cavity and the reaction cavity can be communicated or separated with each other; the heat exchanger is provided with a sludge fluid inlet, a sludge fluid outlet, a tail gas inlet and a tail gas outlet, the tail gas inlet is communicated with the reaction cavity, the sludge fluid outlet and the tail gas outlet are communicated with the pretreatment cavity, and the heat exchanger is used for realizing heat exchange between the sludge fluid and the tail gas. The supercritical water oxidation system provided by the invention reduces the heating amount required by the pretreatment cavity, reduces the heating cost of the pretreatment cavity, improves the energy utilization rate of the supercritical water oxidation system, and effectively saves energy.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a supercritical water oxidation system.
Background
The Supercritical Water Oxidation (SCWO) is an advanced Oxidation technology that uses the special properties of an oxidant in a Supercritical state to rapidly cause an Oxidation reaction between organic matter and the oxidant in the Supercritical Water to completely decompose the organic matter. SCWO is a new waste treatment technology proposed and developed by Modell, an American scholars in the 80 th of the 20 th century, has the characteristics of energy conservation, high efficiency, strong applicability and the like, and is attracted by environmental protection workers at home and abroad.
Supercritical water oxidation technology can treat various toxic organic waste water, organic waste, sludge and human body metabolites, and has many advantages compared with other traditional methods: the method has the advantages of high efficiency, wide application range, suitability for various toxic and refractory organic matters, no need of further treatment of products, no need of external heat supply due to self heat exchange when the content of the organic matters is low, high reaction speed, simple structure of the reactor and large treatment capacity.
The existing supercritical water oxidation technology needs to react under the conditions of high temperature and high pressure, consumes a large amount of energy to ensure working conditions, and is not beneficial to saving energy and reducing working cost.
Disclosure of Invention
The invention provides a supercritical water oxidation system, which is used for solving the technical problems that the supercritical water oxidation system in the prior art is large in energy consumption and difficult to reduce the working cost.
The invention provides a supercritical water oxidation system, which comprises a pretreatment cavity, a reaction cavity and a heat exchanger, wherein the pretreatment cavity is provided with a plurality of reaction chambers;
the pretreatment cavity and the reaction cavity can be communicated or separated with each other;
the heat exchanger is provided with a sludge fluid inlet, a sludge fluid outlet, a tail gas inlet and a tail gas outlet, the tail gas inlet is communicated with the reaction cavity, the sludge fluid outlet and the tail gas outlet are communicated with the pretreatment cavity, and the heat exchanger is used for realizing heat exchange between the sludge fluid and the tail gas.
According to the supercritical water oxidation system provided by the invention, the tail gas inlet is connected with a first tail gas pipeline, and the first tail gas pipeline is communicated with the reaction cavity;
the tail gas outlet is connected with a second tail gas pipeline which is communicated with the pretreatment cavity;
the sludge fluid outlet is connected with a sludge fluid pipeline, and the sludge fluid pipeline is communicated with the pretreatment cavity.
According to the supercritical water oxidation system provided by the invention, the supercritical water oxidation system further comprises a tail gas discharge pipeline, and the tail gas discharge pipeline is communicated with the pretreatment cavity.
According to the supercritical water oxidation system provided by the invention, one end of the first tail gas pipeline communicated with the reaction cavity is provided with the first gas collecting hood, and one end of the tail gas exhaust pipeline communicated with the pretreatment cavity is provided with the second gas collecting hood.
According to the supercritical water oxidation system provided by the invention, the pretreatment cavity is positioned above the reaction cavity, a first control valve is arranged between the pretreatment cavity and the reaction cavity, and the first control valve is used for controlling the communication or separation of the pretreatment cavity and the reaction cavity.
According to the supercritical water oxidation system provided by the invention, the number of the first control valves is multiple, and the multiple first control valves are arranged at intervals along the height direction of the pretreatment cavity.
According to the supercritical water oxidation system provided by the invention, the supercritical water oxidation system also comprises a communicating vessel which is respectively communicated with the pretreatment cavity and the reaction cavity.
According to the supercritical water oxidation system provided by the invention, pressure detection devices are arranged in the pretreatment cavity and the reaction cavity, and the pressure detection devices are used for detecting the air pressure in the pretreatment cavity or the reaction cavity;
the pretreatment cavity is provided with a pressure release device, the pressure detection device is in communication connection with the pressure release device, and the pressure release device is used for releasing pressure when the pressure detection device detects that the air pressure in the pretreatment cavity and/or the reaction cavity is higher than a preset value.
According to the supercritical water oxidation system provided by the invention, the discharge end of the sludge fluid pipeline is provided with the sludge fluid nozzle, and the sludge fluid nozzle is used for granulating sludge fluid.
According to the supercritical water oxidation system provided by the invention, the pretreatment cavity and the reaction cavity are both provided with the heater and the temperature detection device.
According to the supercritical water oxidation system provided by the invention, the heat exchanger is arranged, and the sludge fluid inlet, the sludge fluid outlet, the tail gas inlet and the tail gas outlet are arranged on the heat exchanger, so that not only is the sludge fluid preheated, the heating amount required by the pretreatment cavity reduced, and the heating cost of the pretreatment cavity reduced, but also the energy utilization rate of the supercritical water oxidation system is improved by utilizing the heat of the tail gas, and the energy is effectively saved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a supercritical water oxidation system provided by the present invention.
Reference numerals are as follows:
10: a pretreatment cavity; 101: a pressure relief device; 102: a first heater;
20: a reaction chamber; 201: a first control valve; 203: a second heater;
30: a heat exchanger; 301: a first tail gas pipeline; 3011: a first gas-collecting channel; 302: a second tail gas pipeline; 303: a sludge fluid conduit; 3031: a sludge fluid nozzle; 304: a sludge fluid inlet;
40: a tail gas discharge pipeline; 401: a second gas-collecting channel;
50: a communicating vessel;
60: a slag discharge pipe; 61: a second control valve;
71: a feeding pipe; 72: a reactant nozzle; 73: a flow guide member; 74: a main pipe; 75: a reactant inlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, a supercritical water oxidation system provided by an embodiment of the present invention includes a pretreatment chamber 10, a reaction chamber 20, and a heat exchanger 30.
The pretreatment chamber 10 and the reaction chamber 20 can be communicated with or separated from each other.
The heat exchanger 30 is provided with a sludge fluid inlet 304, a sludge fluid outlet, a tail gas inlet and a tail gas outlet, the tail gas inlet is communicated with the reaction cavity 20, the sludge fluid outlet and the tail gas outlet are both communicated with the pretreatment cavity 10, and the heat exchanger 30 is used for realizing heat exchange between the sludge fluid and the tail gas.
The sludge fluid enters the supercritical water oxidation system through a sludge fluid inlet 304 of the heat exchanger 30, after the heat exchanger 30 preheats the sludge fluid, the sludge fluid enters the pretreatment cavity 10 through a sludge fluid outlet, and then enters the reaction cavity 20 after pretreatment to perform supercritical water oxidation reaction.
Wherein, a control valve or a movable clapboard is arranged between the pretreatment cavity 10 and the reaction cavity 20 and is used for controlling the communication and the separation of the pretreatment cavity 10 and the reaction cavity 20.
The pretreatment chamber 10 is a place for performing heating, drying and pretreatment on sludge fluid, and the temperature in the pretreatment chamber 10 is at least 100 ℃. In the process of pretreating sludge fluid, the control valve or the movable partition plate is closed, and the pretreatment cavity 10 is separated from the reaction cavity 20; after the sludge fluid is pretreated, the control valve or the movable partition plate is opened, the pretreatment cavity 10 is communicated with the reaction cavity 20, so that the sludge fluid enters the reaction cavity 20 to carry out supercritical water oxidation treatment.
Through the heating and drying treatment of the pretreatment cavity 10, the viscosity of the sludge fluid can be reduced, the risk that the sludge fluid is attached to the inner wall of the reaction cavity 20 and blocks the pipeline after entering the reaction cavity 20 is reduced, and the corrosion of the sludge fluid to the reaction cavity 20 is reduced.
In reaction cavity 20, supercritical water oxidation reaction can produce tail gas such as carbon dioxide, water and nitrogen gas of high temperature, and tail gas passes through the tail gas entry and gets into heat exchanger 30, and the heat exchanger carries out the place of heat exchange for mud fluid and tail gas, utilizes the heat of tail gas to preheat mud fluid, reduces the load of preliminary treatment cavity 10. Tail gas flows into pretreatment cavity 10 behind heat exchanger 30, promotes the temperature in pretreatment cavity 10, has reduced the required heating capacity of pretreatment cavity 10, has reduced energy consumption, has promoted supercritical water oxidation system's energy utilization.
The pretreatment cavity 10 and the reaction cavity 20 are surrounded by a cylinder body, the cylinder body is provided with a fastening piece and a sealing piece, and the opening of the cylinder body is provided with a flange and a sealing piece.
The cylinder body can be made of carbon steel, stainless steel 304, stainless steel 310S, nichrome, titanium alloy or a mixed material of carbon steel and refractory material. The thickness of the cylinder body is 10 mm-30 mm. The pretreatment cavity 10 is also provided with a top cover, the top cover and the barrel are fastened by high-strength bolts, a sealing ring is arranged between the top cover and the barrel, and the sealing ring is made of high-temperature-resistant materials. The barrel has a plurality of temperature and pressure trompils for temperature and pressure in the monitoring barrel, and all temperature and pressure trompils design have sleeve pipe and flange, easy to assemble.
The heat exchanger 30 may be a tubular heat exchanger or a plate heat exchanger, and is made of carbon steel or stainless steel. The heat exchanger 30 has heat exchange elements (such as heat exchange tubes, fins, etc.) and a sludge fluid channel therein, and the tail gas inlet and the tail gas outlet are both connected to the heat exchange elements, so that the tail gas can flow into the pretreatment cavity 10 after supplementing a heat source to the heat exchanger 30. One end of the sludge fluid channel is in communication with the sludge fluid inlet 304 and the other end is in communication with the sludge fluid outlet, such that the sludge fluid flowing through the sludge fluid channel is heated.
According to the supercritical water oxidation system provided by the invention, the heat exchanger 30 is arranged, and the sludge fluid inlet 304, the sludge fluid outlet, the tail gas inlet and the tail gas outlet are arranged on the heat exchanger, so that not only is the sludge fluid preheated, the heating amount required by the pretreatment cavity 10 reduced, and the heating cost of the pretreatment cavity 10 reduced, but also the energy utilization rate of the supercritical water oxidation system is improved by utilizing the heat of the tail gas, and the energy is effectively saved.
Further, the tail gas inlet is connected with a first tail gas pipeline 301, and the first tail gas pipeline 301 is communicated with the reaction cavity 20; the tail gas outlet is connected with a second tail gas pipeline 302, and the second tail gas pipeline 302 is communicated with the pretreatment cavity 10; the sludge fluid outlet is connected with a sludge fluid pipeline 303, and the sludge fluid pipeline 303 is communicated with the pretreatment cavity 10.
The first exhaust gas pipeline 301 and the second exhaust gas pipeline 302 are respectively connected to two ends of the heat exchange element of the heat exchanger 30, so that the exhaust gas enters the heat exchanger 30 through the first exhaust gas pipeline 301 to supplement a heat source for the heat exchanger, and then flows into the pretreatment cavity 10 through the second exhaust gas pipeline 302. The sludge fluid inlet 304 may also be connected to an inlet conduit, and one end of the sludge fluid channel is in communication with the inlet conduit and the other end is in communication with the sludge fluid conduit 303, such that the sludge fluid flows through the sludge fluid channel to be heated.
Further, the supercritical water oxidation system further comprises a tail gas exhaust pipeline 40, and the tail gas exhaust pipeline 40 is communicated with the pretreatment cavity 10. One end of the tail gas exhaust pipeline 40 is connected with the pretreatment cavity 10, and the other end is communicated with the external environment or a tail gas treatment device and the like.
After entering the pretreatment chamber 10 from the reaction chamber 20, the tail gas is discharged from the supercritical water oxidation system through the tail gas discharge pipe 40.
Specifically, a first gas-collecting hood 3011 is disposed at one end of the first tail gas pipeline 301 communicated with the reaction cavity 20, and a second gas-collecting hood 401 is disposed at one end of the tail gas exhaust pipeline 40 communicated with the pretreatment cavity 10, so as to facilitate the collection and efficient exhaust of tail gas.
In one embodiment, the pretreatment cavity 10 and the reaction cavity 20 are distributed up and down, the pretreatment cavity 10 is located above the reaction cavity 20, a first control valve 201 is arranged between the pretreatment cavity 10 and the reaction cavity 20, the first control valve is used for controlling the pretreatment cavity 10 to be communicated with or separated from the reaction cavity 20, and when the first control valve 201 is opened, sludge fluid enters the reaction cavity 20 from the pretreatment cavity 10 under the action of gravity.
Further, the first control valve 201 is plural, and the plural first control valves 201 are arranged at intervals in the height direction of the pretreatment chamber 10.
The number of the first control valves 201 is at least two, for example, as shown in fig. 1, and the two first control valves 201 are spaced apart from each other in the height direction of the pretreatment chamber 10. The height direction in this embodiment refers to a vertical direction perpendicular to the ground when the pretreatment chamber 10 is placed in a working state.
Through setting up a plurality of first control valves 201, be favorable to reducing the heat exchange between pretreatment cavity 10 and the reaction cavity 20, avoid the high temperature in pretreatment cavity 10, influence supercritical water oxidation system's stability, can also provide independent processing space for pretreatment cavity 10 and reaction cavity 20 to guarantee that the mud fluid can get into reaction cavity 20 in succession, improve work efficiency.
The first control valve 201 is made of heat-resistant steel, and may be a manual valve, an electric valve, or a pneumatic valve, and may have local control and remote control functions.
Further, the supercritical water oxidation system further comprises a communicating vessel 50, the communicating vessel 50 is respectively communicated with the pretreatment cavity 10 and the reaction cavity 20, and the communicating vessel 50 is used for maintaining the air pressure balance of the pretreatment cavity 10 and the reaction cavity 20.
Through setting up linker 50, can avoid the atmospheric pressure unbalance between preliminary treatment cavity 10 and the reaction cavity 20, influence supercritical water oxidation system's stability.
Further, pressure detection devices are arranged in the pretreatment cavity 10 and the reaction cavity 20, and the pressure detection devices are used for detecting the air pressure in the pretreatment cavity 10 or the reaction cavity 20.
The pretreatment cavity 10 is provided with a pressure release device 101, the pressure detection device is in communication connection with the pressure release device 101, and the pressure release device 101 is used for releasing pressure when the pressure detection device detects that the air pressure in the pretreatment cavity 10 and/or the reaction cavity 20 is higher than a preset value, so that the air pressure is smaller than the preset value.
Specifically, the pretreatment cavity 10 is provided with a pressure release port, the pressure release port is provided with a pressure release device 101, and the pressure release device 101 may be a self-operated pressure regulating valve.
A plurality of pressure detection devices are arranged in the pretreatment cavity 10 and the reaction cavity 20, so that the accuracy of air pressure detection is improved. Because pretreatment cavity 10 and reaction cavity 20 link to each other through linker 50, set up pressure release 101 in pretreatment cavity 10 and can carry out the pressure release to supercritical water oxidation system, improve the security of system.
Preferably, the pressure detection device has the functions of local display and remote monitoring.
In a specific embodiment, the pressure detecting device employs a pressure transmitter, and if the air pressure in the pretreatment chamber 10 and/or the reaction chamber 20 is too high and exceeds a preset value, the pressure releasing device 101 can be automatically opened to release the pressure, so that the air pressure in the pretreatment chamber 10 and the reaction chamber 20 is maintained within a preset safety range, and the safety and reliability of the supercritical water oxidation system are ensured.
In a further embodiment, the discharge end of the sludge fluid conduit 303 is provided with a sludge fluid nozzle 3031, the sludge fluid nozzle 3031 being used for granulating the sludge fluid.
The sludge fluid is heated and dried by the heat exchanger 30, then flows through the sludge fluid pipeline 303, forms sludge particles under the high-speed injection of the sludge fluid nozzle 3031, and is heated and dried again in the pretreatment cavity 10, which is beneficial to increasing the contact area of the sludge fluid and the reactant in the reaction cavity 20 and improving the reaction efficiency.
Further, the pretreatment chamber 10 and the reaction chamber 20 are both provided with a heater and a temperature detection device. For example, as shown in fig. 1, the pre-treatment chamber 10 is provided with a first heater 102, and the reaction chamber 20 is provided with a second heater 203.
The heater is used for heating the pretreatment cavity 10 and the reaction cavity 20 to reach the working temperature. The heat source of the heater may be one or more of an electric heater, plasma or natural gas. Preferably, the heating temperature of the heater can be controlled.
A plurality of temperature detection devices are arranged in the pretreatment cavity 10 and the reaction cavity 20, which is helpful for obtaining the temperatures of different positions. The temperature detection device may employ a thermocouple or a thermal resistor. Preferably, the temperature detecting device is inserted and is connected with the pretreatment chamber 10 and the reaction chamber 20 through a detachable connection (such as a flange connection or a threaded connection), so that the temperature detecting device is convenient to detach and replace.
The heater and the temperature detection device can be in communication connection, so that the accuracy and the automation degree of temperature regulation are further improved.
Further, the bottom of the reaction cavity 20 is provided with a slag discharge port, the bottom of the slag discharge port is connected with a slag discharge pipe 60, and the slag discharge pipe 60 is provided with a second control valve 61.
The dross generated by the reaction in the reaction chamber 20 flows downward and is discharged from the dross discharge pipe 60 through the dross discharge port.
Preferably, the second control valve 61 is provided in plurality, and the second control valves 61 are arranged at intervals on the slag discharging pipe 60. Specifically, as shown in fig. 1, two second control valves 61 are arranged at intervals in the flow direction in the slag discharge pipe 230. When dregs are generated in the reaction chamber 20 through reaction, the second control valve 61 positioned at the upstream is opened, the second control valve 61 positioned at the downstream is closed, and the dregs fall between the two second control valves 61; subsequently, the second control valve 61 located at the upstream is closed, the second control valve 61 located at the downstream is opened, and the slag is discharged into the corresponding collecting device through the slag discharge pipe 60, while the reactant in the reaction chamber 20 does not flow out due to the closing of the second control valve 61 located at the upstream, and continuous slag discharge without shutdown of the system is realized.
The second control valve 61 is made of heat-resistant steel, and may be a manual valve, an electric valve, or an air-operated valve, and may have local control and remote control functions.
The supercritical water oxidation system provided by the embodiment of the invention also comprises a reactant injection device, and the reactant injection device is arranged in the pretreatment cavity 10.
The reactant injection device comprises a reactant inlet pipe 71, the reactant inlet pipe 71 penetrates through the wall of the reaction cavity 20, and a reactant nozzle 72 is arranged at one end of the reactant inlet pipe 71, which is positioned in the reaction cavity 20.
The length direction of the agent inlet pipe 71 is vertical to the height direction of the reaction cavity 20, and the reactant sprayed from the reactant nozzle 72 can form cyclone in the reaction cavity 20, so that the oxidation rate of the reactant to the sludge is improved while corrosion products are prevented from corroding the wall of the cavity.
The reactant nozzles 72 may be inclined with respect to a horizontal or vertical plane to create cyclones in different directions. In one embodiment, the reactant injector 72 is a dual head bi-directional injector, wherein one head is perpendicular to the height of the reaction chamber 20 to provide horizontal injection of the reactant; the other end is parallel to the height direction of the reaction cavity 20, so that the reactant is sprayed upwards.
The reactant injection device further comprises a flow guide member 73, the flow guide member 73 is installed at one end of the reactant inlet pipe 71 located in the reaction cavity 20 and is arranged at an interval with the reactant nozzle 72, the flow guide member 73 is provided with a flow guide surface, and the reactant outlet direction of the reactant nozzle 72 is obliquely intersected with the flow guide surface 0.
Referring to fig. 1, the flow guiding member 73 of this embodiment is a flow guiding plate, and may be made of a heat-resistant and corrosion-resistant material (e.g., 310S). The side of the guiding member 73 close to the reactant nozzle 72 is a guiding surface, which may be a plane or an arc surface, or another irregular surface. The diversion piece 73 is made of nickel-chromium and other heat-resistant and corrosion-resistant materials, the installation angle can be adjusted, the diversion piece 73 is matched with the reactant nozzle 72, rotary cutting force is generated in the reaction cavity 20, supercritical water oxidation reaction products are wrapped, and the supercritical water oxidation reaction products enter the slag discharge pipe 60 to be discharged out of the system.
The arrangement of the flow guide piece 73 and the reactant nozzle 72 increases the contact area of sludge particles and the reactant on one hand, and improves the reaction efficiency; on the other hand, the probability that the supercritical water oxidation reaction product collides and contacts the wall of the reaction cavity 20 is reduced, and the risk that the reaction cavity 20 is corroded is reduced.
Further, there are a plurality of the reagent feeding pipes 71, and the reagent feeding pipes 71 are communicated with each other and arranged at intervals in the height direction of the reaction chamber 20.
As shown in fig. 1, the reactant injection device further includes a main pipe 74, the plurality of reactant inlet pipes 71 are all communicated with the main pipe 74 and serve as branch pipes of the main pipe 74, one end of the main pipe 74 is provided with a reactant inlet 75, and the reactant enters the main pipe 74 through the reactant inlet 75 and enters the reaction chamber 20 from the plurality of reactant inlet pipes 71. Each injection tube 71 can also control the dosage independently, and accurately control the injection amount of the reactant.
The plurality of agent inlet pipes 71 are arranged at intervals along the height direction of the reaction cavity 20, and a cyclone with a corresponding height is formed in the reaction cavity 20, so that the reaction efficiency is improved.
The reactant injection means may be one or more. In one embodiment, as shown in fig. 1, the number of the reactant injection devices is two, and the reactant injection devices are distributed around the circumference of the reaction chamber 20, and each reactant injection device has two inlet pipes 71. The heights of the inlet pipes 71 of the two reactant injection devices correspond to each other to better form a cyclone.
It should be noted that, in the embodiment of the present invention, the pipelines include, but are not limited to, the first exhaust pipeline 301, the second exhaust pipeline 302, the sludge fluid pipeline 303, the slag discharge pipe 60, and the agent inlet pipe 71, the parts inside the pretreatment chamber 10 and the reaction chamber 20 are made of heat-resistant and corrosion-resistant materials, and the parts outside the pretreatment chamber 10 and the reaction chamber 20 are made of corrosion-resistant materials such as PP (polypropylene), glass fiber reinforced plastics, or stainless steel.
The supercritical water oxidation system provided by the embodiment of the invention has the advantages of simple and exquisite structure, strong practicability and wide application range, is in a closed environment, can treat the sludge fluid up to the standard, and reduces the environmental pollution.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A supercritical water oxidation system is characterized by comprising a pretreatment cavity, a reaction cavity and a heat exchanger;
the pretreatment cavity and the reaction cavity can be communicated or separated with each other;
the heat exchanger is provided with a sludge fluid inlet, a sludge fluid outlet, a tail gas inlet and a tail gas outlet, the tail gas inlet is communicated with the reaction cavity, the sludge fluid outlet and the tail gas outlet are communicated with the pretreatment cavity, and the heat exchanger is used for realizing heat exchange between the sludge fluid and the tail gas.
2. The supercritical water oxidation system of claim 1, wherein the tail gas inlet is connected to a first tail gas conduit, the first tail gas conduit being in communication with the reaction chamber;
the tail gas outlet is connected with a second tail gas pipeline which is communicated with the pretreatment cavity;
the sludge fluid outlet is connected with a sludge fluid pipeline, and the sludge fluid pipeline is communicated with the pretreatment cavity.
3. The supercritical water oxidation system of claim 2 further comprising a tail gas exhaust line in communication with the pretreatment cavity.
4. The supercritical water oxidation system of claim 3, wherein a first gas collecting hood is disposed at one end of the first exhaust gas pipeline communicated with the reaction chamber, and a second gas collecting hood is disposed at one end of the exhaust gas exhaust pipeline communicated with the pretreatment chamber.
5. The supercritical water oxidation system of claim 1, wherein the pretreatment cavity is located above the reaction cavity, and a first control valve is arranged between the pretreatment cavity and the reaction cavity and used for controlling the communication or separation of the pretreatment cavity and the reaction cavity.
6. The supercritical water oxidation system of claim 5, wherein the first control valve is a plurality of first control valves, and the plurality of first control valves are arranged at intervals along the height direction of the pretreatment cavity.
7. The supercritical water oxidation system of claim 1 further comprising a communicator communicating with the pretreatment chamber and the reaction chamber, respectively.
8. The supercritical water oxidation system of claim 7, wherein pressure detection devices are disposed in the pretreatment cavity and the reaction cavity, and are configured to detect a gas pressure in the pretreatment cavity or the reaction cavity;
the pretreatment cavity is provided with a pressure release device, the pressure detection device is in communication connection with the pressure release device, and the pressure release device is used for releasing pressure when the pressure detection device detects that the air pressure in the pretreatment cavity and/or the reaction cavity is higher than a preset value.
9. The supercritical water oxidation system of claim 1 wherein the discharge end of the sludge fluid conduit is provided with a sludge fluid nozzle for granulating sludge fluid.
10. The supercritical water oxidation system of claim 1 wherein the pretreatment cavity and the reaction cavity are each provided with a heater and a temperature detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210129253.3A CN114477687A (en) | 2022-02-11 | 2022-02-11 | Supercritical water oxidation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210129253.3A CN114477687A (en) | 2022-02-11 | 2022-02-11 | Supercritical water oxidation system |
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| CN114477687A true CN114477687A (en) | 2022-05-13 |
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| CN202210129253.3A Pending CN114477687A (en) | 2022-02-11 | 2022-02-11 | Supercritical water oxidation system |
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- 2022-02-11 CN CN202210129253.3A patent/CN114477687A/en active Pending
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