Water vapor plasma generating system

Abstract

The utility model discloses a water vapor plasma generation system which comprises a plasma power supply, a water vapor plasma generator, a water vapor overheating heater, a high-temperature air system, a cooling water treatment system and a control system. Compressed air is heated by the air heater and then is connected into the steam plasma generator through a pipeline to heat the internal structure of the generator; performing arc starting and arc stabilizing by using superheated steam as carrier gas of a plasma generator; and the cooling water treatment system is used for carrying out cooling protection on a cathode and an anode in the water vapor plasma generator. The device can realize direct arc starting by taking water vapor as carrier gas so as to generate water vapor plasma, and solves the problem that the water vapor is easy to condense into water in a system.

Description

Technical Field

[0001] The utility model relates to the technical field of water vapor plasma generators, in particular to a water vapor plasma generating system. Background Art

[0002] The rapid development of social economy has led to a rapid increase in the production of solid waste. Traditional treatment processes such as landfill, incineration and composting are not only inefficient but also have many problems such as secondary pollution and waste of resources. Plasma gasification technology is used in the treatment of solid waste due to its high efficiency, environmental protection and high energy conversion rate.

[0003] The water vapor plasma arc has the characteristics of high temperature and high enthalpy, and has strong oxidizing properties. The water vapor plasma arc is mainly composed of hydrogen atoms, hydrogen ions, oxygen atoms, oxygen ions and free electrons. The content of harmful gases such as nitrogen oxides in the tail gas generated when treating waste is very low. Therefore, the difficulty and cost of tail gas treatment will be much lower when using a plasma system with high-temperature water vapor as a carrier to treat solid waste.

[0004] The plasma generation system using water vapor as carrier gas has a very broad application prospect, but water vapor has poor stability and is easy to condense into water at room temperature. Therefore, the water vapor plasma generation system has not yet been widely used. Utility Model Content

[0005] Technical issues solved

[0006] The purpose of the utility model is to make up for the deficiencies of the prior art and to provide a water vapor plasma generating system and a method for directly starting an arc using water vapor.

[0007] Technical Solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a water vapor plasma generating system, comprising a water vapor plasma generator, a plasma power supply, a superheated water vapor system, a high-temperature air system, a cooling water system, and a control system, wherein the plasma power supply is connected to the water vapor plasma generator via a cable to provide the energy required to generate plasma.

[0009] Superheated steam system: including steam heater, pipelines, valves and instruments. The steam heater heats the input steam to a superheat degree of more than 15°C, and is connected to the steam plasma generator through a pipeline to provide the carrier required to generate plasma;

[0010] High-temperature air system: including air heater, pipelines, valves and instruments. The air heater heats the air to over 100°C, and the heated high-temperature air is connected to the water vapor plasma generator through pipelines;

[0011] Cooling water system: used to cool down and protect the cathode and anode in the water vapor plasma generator;

[0012] Control system: used to monitor various temperature, pressure, flow and other signals, and control the logical relationship of various actuators.

[0013] The above-mentioned superheated steam system further includes a steam buffer tank, and a first temperature sensor, a first pressure gauge and a first flow meter are installed at intervals on the pipeline between the steam buffer tank and the steam heater;

[0014] The output pipeline of the water vapor buffer tank is connected in sequence with a water vapor pipeline stop valve, a second flow meter, a second pressure gauge, a second temperature sensor, and a water vapor pipeline outlet regulating valve.

[0015] As described above, through the control system, the superheated steam enters the steam buffer tank and is output after the pressure rises to 0.4Mpa.

[0016] As mentioned above, a steam pipe mouth regulating valve is also installed on the output pipeline of the steam buffer tank, and the end of the steam pipe mouth regulating valve is connected to the steam plasma generator. A steam pipeline drain stop valve is also installed on the output pipeline of the steam buffer tank, and the end of the steam pipeline drain stop valve is connected to the drain outlet.

[0017] The high temperature air system mentioned above also includes an air pipeline flow meter, an air pipeline pressure gauge, an air pipeline temperature sensor and an air pipe outlet regulating valve connected to the end of the air heater.

[0018] As mentioned above, the cooling water treatment system includes a water cooling device, a circulating cooling pipeline formed between the water cooling device and the water vapor plasma generator, and a pump group on the circulating cooling pipeline.

[0019] The cooling water treatment system mentioned above also includes an inlet temperature sensor and a regulating valve arranged on the cooling water inlet pipeline, and an outlet temperature sensor and a cooling pipeline flow meter arranged on the cooling water outlet pipeline.

[0020] Beneficial effects:

[0021] Compared with the prior art, this water vapor plasma generating system has the following beneficial effects:

[0022] The utility model can realize direct arc starting with water vapor as carrier gas and then generate water vapor plasma, which solves the problem that water vapor is easy to condense into water in the system. In addition, the arc starting process is simple, stable and easy to control. The software and hardware costs are low.

[0023] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and study, or may be taught from the practice of the present invention to some extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the system structure of the utility model;

[0025] Figure 2 This is the principle block diagram of the control system of the utility model. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] like Figure 1 As shown, a novel water vapor plasma generating system for directly starting arc with water vapor comprises a water vapor plasma generator, a plasma power supply, a superheated water steam system, a high temperature air system, a cooling water system, and a control system.

[0028] like Figure 1 As shown, the superheated steam system includes a steam heater 3-11, a steam pipeline temperature sensor (a first temperature sensor 3-8 and a second temperature sensor 3-3), a steam pipeline pressure gauge (a first pressure gauge 3-9 and a second pressure gauge 3-4), a steam pipeline flow meter (a first flow meter 3-10 and a second flow meter 3-5), a steam buffer tank 3-7, a steam pipeline stop valve 3-6, a steam pipe outlet regulating valve 3-1, and a steam pipeline drain stop valve 3-2. The steam buffer tank 3-7 is designed to have a working pressure of 1.0 MPa and is equipped with a safety valve. The steam generated by the steam generator is heated by the heater 3-11 to form superheated steam, and the superheated steam enters the steam buffer tank 3-7 after parameter monitoring by the flow meter 3-10, the pressure gauge 3-9, and the temperature sensor 3-8, and the pressure of the buffer tank is maintained at about 0.4 MPa. The flow meter 3-5, the pressure gauge 3-4 and the temperature sensor 3-3 are used to monitor the state of water vapor entering the plasma generator 1 and send it to the control system as a feedback signal. The control system adjusts the water vapor inlet pressure and the power of the heater 3-11 according to the parameter setting value and the feedback value to ensure the accuracy of the pressure and temperature of the water vapor carrier gas.

[0029] like Figure 1As shown, the high-temperature air system includes an air heater 4-5, an air pipeline temperature sensor 4-2, an air pipeline pressure gauge 4-3, an air pipeline flow meter 4-4, and an air pipe opening regulating valve 4-1. The compressed air is heated by the air heater 4-5 to form high-temperature air, and the high-temperature air enters the plasma generator after parameter monitoring by the temperature sensor 4-2, the pressure gauge 4-3, and the flow meter 4-4. The monitoring parameters are fed back to the control system, and the control system adjusts the power of the regulating valve 4-1 and the heater 4-5 according to the parameter setting value and the feedback value to ensure the accuracy of the flow and temperature of the hot air.

[0030] like Figure 1 As shown, the cooling water system includes cooling water treatment equipment 5-6, cooling water pipeline regulating valve 5-1, cooling water pipeline flow meter 5-2, cooling water pipeline temperature sensors 5-5 and 5-3. The control system controls the regulating valve 5-1 by monitoring the feedback signal of the flow meter 5-2 to accurately control the cooling water flow. The temperature sensor 5-5 reflects the inlet temperature of the plasma generator cooling water, and the temperature sensor 5-3 reflects the outlet temperature of the plasma generator cooling water. When the control system calculates that the outlet temperature is too high compared to the inlet temperature, the cooling water flow will be automatically increased and a warning signal will be issued.

[0031] The water vapor plasma generator can be an existing water vapor plasma generator, which generally includes an arc rod assembly, a cathode assembly, an anode assembly, and a water vapor carrier gas circuit assembly. The cathode assembly and the anode assembly are designed with a cooling water circulation structure connected to the cooling water treatment system. The cooling water cools down the cathode and anode during system operation to protect them and increase their operating life.

[0032] The water vapor carrier gas circuit assembly is connected to the superheated steam system and transports the water vapor carrier gas to the cathode and the anode to generate water vapor plasma. The water vapor carrier gas circuit assembly is heat-insulated to prevent the water vapor carrier gas from condensing into liquid water in the gas circuit during operation. At the same time, the water vapor carrier gas circuit assembly is designed with a drainage structure to ensure the effective discharge of residual water after shutdown and cooling.

[0033] The water vapor plasma generation method is divided into 4 steps: 1) preheating the plasma generator; 2) preheating and draining the water vapor pipeline; 3) starting the arc with water vapor as carrier gas; 4) shutting down.

[0034] First, preheat the plasma generator: the steps are: 1) adjust the cooling water outlet regulating valve 5-1 to adjust the cooling water flow to an extremely low value; 2) close the steam outlet regulating valve 3-1 and open the air outlet regulating valve 4-1; 3) turn on the air heater 3-11 to preheat the plasma generator. The preheating is completed when the cooling water outlet temperature stabilizes at 60°C.

[0035] At the same time, the steam pipeline is preheated and drained, the steps are: 1) open the steam pipeline drain valve 3-2; 2) open the steam heater 3-11 to preheat and drain the steam pipeline. When the temperature monitored by the pipe temperature sensor 3-3 reaches the saturation temperature, the steam pipeline preheating and drainage are completed.

[0036] Furthermore, water vapor is used as a carrier gas to start the arc, and the steps are: 1) close the air pipe outlet electric regulating valve 4-1 and the air heater 4-5; 2) open the water vapor pipe outlet regulating valve 3-1 and close the water vapor pipeline drain valve 3-2, and adjust the water vapor to an appropriate flow rate; 3) turn on the plasma voltage 2 and set the arc starting current to start the arc; 4) adjust the water vapor flow rate and the current until the target power is reached.

[0037] Furthermore, a shutdown operation is performed, the method is: 1) stop the arc and turn off the plasma power supply 2; 2) close the water vapor pipe regulating valve 3-1, and open the water vapor pipeline drain valve 3-2; 3) open the air pipe regulating valve 4-1, and use high-temperature air to drain and dry the plasma generator; 4) close the water vapor pipeline drain valve 3-2, close the air pipe regulating valve 4-1, and the shutdown is completed.

[0038] It should be noted that, in this article, the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model; the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected", and "connected" should be understood in a broad sense. For example, "installed" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a mechanical connection or an electrical connection; "connected" can be a direct connection, an indirect connection through an intermediate medium, or a connection between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water vapor plasma generating system, characterized in that: It comprises a water vapor plasma generator (1), a plasma power source (2), a superheated water vapor system (3), a high temperature air system (4), a cooling water system (5), and a control system (6), wherein the plasma power source (2) is connected to the water vapor plasma generator (1) via a cable to provide energy required for generating plasma; The superheated steam system (3) comprises a steam heater (3-11), pipelines, valves and instruments. The steam superheater heats the input steam to a superheat degree of more than 15°C and is connected to the steam plasma generator through a pipeline to provide a carrier required for generating plasma. The superheated steam system also comprises a steam buffer tank (3-7). A first temperature sensor (3-8), a first pressure gauge (3-9) and a first flow meter (3-10) are installed on the pipeline between the steam buffer tank (3-7) and the steam heater (3-11) at intervals. The output pipeline of the water vapor buffer tank (3-7) is connected in sequence with a water vapor pipeline stop valve (3-6), a second flow meter (3-5), a second pressure gauge (3-4) and a second temperature sensor (3-3); the output pipeline of the water vapor buffer tank (3-7) is also equipped with a stop valve (3-6) and a water vapor pipe outlet regulating valve (3-1); the end of the water vapor pipe outlet regulating valve (3-1) is connected to the water vapor plasma generator (1); the output pipeline of the water vapor buffer tank (3-7) is also equipped with a water vapor pipeline drainage stop valve (3-2); the end of the water vapor pipeline drainage stop valve (3-2) is connected to the drainage outlet; The high-temperature air system (4) comprises an air heater (4-5), pipelines, valves and instruments. The air heater (4-5) heats the air to a temperature exceeding 100° C. The high-temperature air obtained by heating is connected to the water vapor plasma generator (1) through a pipeline. The high-temperature air system also comprises an air pipeline flow meter (4-4), an air pipeline pressure gauge (4-3), an air pipeline temperature sensor (4-2) and an air pipe outlet regulating valve (4-1) connected to the end of the air heater (4-5). The air pipe outlet regulating valve (4-1) is connected to the water vapor plasma generator (1). Cooling water system (5): used to cool down and protect the cathode and anode in the water vapor plasma generator; Control system (6): used to monitor various temperature, pressure, and flow signals, and control the logical relationship of various actuators.

2. A water vapor plasma generating system according to claim 1, characterized in that: Under the control of the control system (6), the superheated water vapor enters the water vapor buffer tank (3-7) and is output after the pressure rises to 0.4 MPa.

3. A water vapor plasma generating system according to claim 1, characterized in that: The cooling water treatment system comprises a water cooling device (5-6), a circulating cooling pipeline formed between the water cooling device (5-6) and a water vapor plasma generator (1), and a pump group on the circulating cooling pipeline.

4. A water vapor plasma generating system according to claim 1, characterized in that: The cooling water treatment system also includes an inlet temperature sensor (5-5) and a regulating valve (5-1) arranged on the cooling water inlet pipeline, and an outlet temperature sensor (5-3) and a cooling pipeline flow meter (5-2) arranged on the cooling water outlet pipeline.

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