DBD plasma assisted garbage mixed coal combustion generating device

Abstract

The invention discloses a DBD plasma-assisted garbage-blended coal combustion generating device, which comprises a combustion reaction chamber for forming a plasma field through a high-voltage needle plate electrode for garbage combustion; the multi-channel temperature recorder is used for monitoring the temperature in the combustion reaction chamber; the pulverized coal supply pump is used for conveying pulverized coal to the combustion reaction chamber and is used for supporting combustion of the garbage; and the plasma generation power supply is connected with the high-voltage needle plate electrode and is used for supplying power to the high-voltage needle plate electrode. On the basis of the needle plate electrode DBD, the discharge plasma is used for assisting combustion of the garbage mixed coal, the DBD plasma generating device is low in cost, stable low-temperature plasma can be generated in the atmospheric pressure environment, high-energy electrons and active particles generated by the plasma are used for exciting and promoting the combustion reaction, and the combustion efficiency is improved. The combustion efficiency and the heat efficiency can be obviously improved.

Description

Technical Field

[0001] The invention relates to the field of plasma technology, in particular to a DBD plasma assisted garbage mixed with coal combustion generation device. Background Art

[0002] With the continuous increase in global energy demand and the improvement of environmental protection awareness, the clean utilization of traditional energy and the harmless treatment of waste have become dual challenges facing today's society. As one of the world's most important energy sources, coal still occupies an important position in energy supply. However, the coal combustion process will produce a large amount of pollutants, such as sulfur dioxide, nitrogen oxides and particulate matter, which have a serious impact on the environment. At the same time, garbage disposal is also an important environmental issue. Traditional landfill and simple incineration methods have problems such as occupying land resources, polluting soil and groundwater, and generating secondary pollution. In recent years, plasma technology has received widespread attention as a new type of clean energy technology. Dielectric Barrier Discharge (DBD) plasma is considered to have important application potential in the efficient and clean combustion of coal and garbage because it can generate high-energy electrons and active particles at room temperature and pressure. DBD plasma can promote combustion reactions, improve combustion efficiency, and effectively reduce the generation of pollutants. However, existing garbage combustion devices generally have problems such as low combustion efficiency, low energy utilization, and high pollutant emissions.

[0003] In order to solve the problems of low garbage combustion efficiency, low energy utilization rate, high pollutant emissions, etc., it is necessary to improve the existing combustion equipment. For this purpose, a DBD plasma assisted garbage mixed coal combustion device is designed. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a DBD plasma-assisted garbage-mixed coal combustion generation device, which uses high-energy electrons and active particles generated by plasma to stimulate and promote combustion reactions, and can significantly improve combustion efficiency and thermal efficiency.

[0005] The DBD plasma-assisted garbage-coal-blended combustion generation device proposed in the present invention comprises:

[0006] The combustion reaction chamber forms a plasma field through high-voltage needle-plate electrodes for waste combustion;

[0007] Multi-channel temperature recorder, used to monitor the temperature in the combustion reaction chamber;

[0008] A pulverized coal supply pump is used to deliver pulverized coal to the combustion reaction chamber for assisting the combustion of garbage;

[0009] The plasma generating power source is connected to the high-voltage needle plate electrode and is used for supplying power to the high-voltage needle plate electrode.

[0010] Preferably, the combustion reaction chamber comprises:

[0011] A combustion chamber for burning garbage;

[0012] A first high-voltage needle electrode plate and a second high-voltage needle electrode plate are arranged from top to bottom, respectively arranged at two ends of the combustion chamber, and used to form a plasma field in the combustion chamber;

[0013] The first porous medium and the second porous medium are respectively arranged on one side of the first high-voltage needle electrode plate and the second high-voltage needle electrode plate close to the combustion chamber;

[0014] A low-voltage mesh electrode is disposed in the combustion chamber, wherein a plasma field is formed within the intervals between the low-voltage mesh electrode and the first high-voltage needle electrode plate and the second high-voltage needle electrode plate;

[0015] The low-voltage mesh electrode is provided with a through hole, the garbage is placed above the low-voltage mesh electrode, and the coal powder is passed into the combustion reaction chamber from below the low-voltage mesh electrode.

[0016] Preferably, a waste gas collecting device is also provided on the top of the combustion chamber, and the waste gas collecting device is located above the first high-voltage electrode plate.

[0017] Preferably, the exhaust gas collecting device is connected to an exhaust gas treatment device.

[0018] Preferably, a blower is also provided at the bottom of the combustion chamber, and the blower is located below the second high-voltage needle electrode plate.

[0019] Preferably, a plurality of needle electrodes are provided on one side of the first high-voltage needle electrode plate and the second high-voltage needle electrode plate close to the combustion chamber, and the needle electrodes are wrapped with ceramic medium.

[0020] Preferably, the distances from the needle tips of the needle electrodes on the first high-voltage needle electrode plate and the second high-voltage needle electrode plate to the low-voltage mesh electrode are the same.

[0021] Preferably, the second high-voltage needle electrode plate is provided with a pulverized coal ignition device, and the second high-voltage needle electrode plate is arc-shaped.

[0022] Preferably, the combustion chamber side wall is provided with a reaction chamber inspection window, a coal powder inlet, a coal ash outlet and a garbage mixture inlet, the reaction chamber inspection window is provided with a window door, and the coal powder inlet is connected to the coal powder supply pump.

[0023] Beneficial technical effects of the present invention:

[0024] (1) The present invention aims to solve the problem that domestic waste itself is difficult to burn and produces a large amount of pollutants. It is based on the needle-plate electrode DBD and uses discharge plasma to assist the combustion of waste mixed with coal. The DBD plasma generator has low cost and can produce relatively stable low-temperature plasma under atmospheric pressure. The high-energy electrons and active particles generated by the plasma are used to stimulate and promote the combustion reaction, which can significantly improve the combustion efficiency and thermal efficiency.

[0025] (2) The device of the present invention uses the alumina ceramic medium and the porous medium wrapped on the needle electrode as dual media, which can generate more and more uniform plasma, increase the coupling speed between the discharge plasma and the flame plasma, and improve the combustion efficiency.

[0026] (3) The first high-pressure needle electrode plate, the first porous medium, the low-pressure mesh electrode, the second porous medium, and the second high-pressure needle electrode plate in the combustion reaction chamber of the present invention are all designed with ventilation holes. The rotation of the blower fan causes the hot air flow and the burning coal powder in the combustion reaction chamber to move upward, thereby driving the combustion reaction of the garbage mixture.

[0027] (4) The combustion reaction chamber of the device of the present invention is divided into two stages, namely, the lower chamber plasma assisted coal powder combustion and the upper chamber plasma and coal powder assisted garbage mixture combustion. The high-energy electrons and active particles generated by the plasma are used to stimulate and promote the combustion reaction, so that the garbage mixture can be completely burned to reduce the emission of polluting gases.

[0028] (5) The present invention can achieve the purpose of controlling combustion by adjusting multiple parameters. The combustion reaction chamber is designed with a coal powder inlet connected to a coal powder supply pump, which can conveniently control the coal powder concentration in the combustion chamber and thus control the combustion rate; the combustion reaction chamber is designed with a reaction chamber inspection window and a garbage mixture inlet, which can timely add garbage mixture according to the garbage combustion situation; the plasma generating power supply is a digitally adjustable high-voltage power supply, which can control the discharge parameters and thus regulate the combustion reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of the DBD plasma-assisted garbage-coal blending combustion device proposed in the present invention;

[0030] Figure 2 This is a schematic explosion diagram of the combustion reaction chamber proposed by the present invention.

[0031] In the figure: 1-combustion reaction chamber, 101-waste gas collecting device, 102-first high-voltage needle electrode plate, 103-first porous medium, 104-low-voltage mesh electrode, 105-reaction chamber inspection window, 106-window door, 107-coal powder inlet, 108-second porous medium, 109-second high-voltage needle electrode plate, 110-blower, 111-combustion chamber, 112-coal ash outlet, 113-garbage mixture inlet, 2-multi-channel temperature recorder, 3-coal powder supply pump, 4-plasma generating power supply, 5-waste gas treatment device. DETAILED DESCRIPTION

[0032] The present invention will be further explained below in conjunction with specific embodiments.

[0033] Reference Figure 1 and Figure 2 The DBD plasma-assisted garbage-mixed coal combustion generation device proposed in the present invention includes: a combustion reaction chamber 1, a multi-channel temperature recorder 2, a coal powder supply pump 3 and a plasma generation power supply 4.

[0034] The combustion reaction chamber 1 forms a plasma field through high-voltage needle-plate electrodes for waste combustion;

[0035] A multi-channel temperature recorder 2 is connected to a temperature sensor provided on the inner wall of the combustion reaction chamber 1 and is used to monitor the temperature in the combustion reaction chamber 1;

[0036] A pulverized coal supply pump 3 is used to deliver pulverized coal to the combustion reaction chamber 1 for assisting the combustion of garbage. The pulverized coal supply pump is a flow-adjustable supply pump;

[0037] The plasma generating power supply 4 is connected to the high-voltage needle plate electrode and is used to supply power to the high-voltage needle plate electrode, the plasma generating power supply 4 .

[0038] In this embodiment, the combustion reaction chamber 1 includes:

[0039] The combustion chamber 111 can form a plasma field and make the garbage burn in the plasma field;

[0040] The first high-voltage needle electrode plate 102 and the second high-voltage needle electrode plate 109 are arranged from top to bottom, respectively, at two ends of the combustion chamber 111, and are used to form a plasma field in the combustion chamber 111;

[0041] The first porous medium 103 and the second porous medium 108 are respectively arranged on one side of the first high-voltage needle electrode plate 102 and the second high-voltage needle electrode plate 109 close to the combustion chamber 111;

[0042] The low-voltage mesh electrode 104 is disposed in the combustion chamber 111, and a plasma field is formed in the intervals between the low-voltage mesh electrode 104 and the first high-voltage needle electrode plate 102 and the second high-voltage needle electrode plate 109;

[0043] The low-pressure mesh electrode 104 is provided with through holes, garbage is placed above the low-pressure mesh electrode 104 , and coal powder is introduced into the combustion reaction chamber 1 from below the low-pressure mesh electrode 104 .

[0044] In this embodiment, a waste gas collecting device 101 is also provided on the top of the combustion chamber 111. The waste gas collecting device 101 is located above the first high-voltage electrode plate 102. The waste gas collecting device 101 is connected to the waste gas treatment device 5, which can treat the waste gas generated by the combustion of garbage.

[0045] In this embodiment, a blower 110 is further provided at the bottom of the combustion chamber 111. The blower 110 is located below the second high-voltage needle electrode plate 109. The design of the blower can further improve the completeness of garbage combustion, and the speed of the blower is adjustable.

[0046] A plurality of needle electrodes are disposed on one side of the first high-voltage needle electrode plate 102 and the second high-voltage needle electrode plate 109 close to the combustion chamber 111 , and a ceramic medium is wrapped on the needle electrodes.

[0047] The distances from the needle tips of the needle electrodes on the first high-voltage needle electrode plate 102 and the second high-voltage needle electrode plate 109 to the low-voltage mesh electrode are the same.

[0048] The second high-voltage needle electrode plate 109 is provided with a pulverized coal ignition device, and the second high-voltage needle electrode plate 109 is arc-shaped.

[0049] The combustion chamber side wall is provided with a reaction chamber inspection window 105 , a coal powder inlet 107 , a coal ash outlet 112 and a garbage mixture inlet 113 . The reaction chamber inspection window 105 is provided with a window door 106 . The coal powder inlet 107 is connected to the coal powder supply pump 3 .

[0050] In the experimental sequence, firstly, the garbage mixture is added to the upper chamber of the combustion chamber through the garbage mixture inlet 113, then the blower fan 110 is turned on, and the coal powder supply pump 3 is turned on to pump coal powder into the lower chamber of the combustion chamber, then the coal powder ignition device located on the high-voltage needle electrode plate 109 is activated to ignite the coal powder, and then the plasma generating power supply 4 is turned on to generate plasma in the lower chamber of the combustion chamber and the upper chamber of the combustion chamber, so that the discharge plasma is mixed with the combustion plasma, and the high-energy electrons and active particles generated by the plasma are used to stimulate and promote the combustion reaction, so that the garbage mixture can be completely burned to reduce the emission of polluting gases. The amplitude and frequency of the DBD external voltage, the coal powder feeding rate of the combustion chamber, and the blower fan rotation speed are controlled to realize the control of the combustion of the garbage mixture in the chamber, and the efficiency and stability of the combustion of the garbage mixture under different coal powder feeding rates and coal powder feeding rates of the combustion chamber are explored. The concentration of active groups formed by plasma excitation inside the combustion chamber increases. Since combustion is a complex chain reaction, the addition of active groups can reduce the bond energy required for the chain reaction and promote the progress of the chain reaction. In the discharge combustion chamber, the discharge plasma and the combustion plasma are coupled with each other to synergistically enhance the combustion of coal-coupled garbage inside the combustion chamber.

[0051] Although the embodiments of the present application have been shown and described, it will be understood 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 application. The scope of the present application is defined by the appended claims and their equivalents, and all shall be included in the scope of protection of the present application.

Claims

1. DBD plasma assisted garbage mixed coal combustion generation device, characterized in that: include: A combustion reaction chamber (1) forms a plasma field through high-voltage needle-plate electrodes for waste combustion; A multi-channel temperature recorder (2) for monitoring the temperature in the combustion reaction chamber (1); A pulverized coal supply pump (3) is used to deliver pulverized coal to the combustion reaction chamber (1) for assisting the combustion of garbage; The plasma generating power source (4) is connected to the high-voltage needle plate electrode and is used to supply power to the high-voltage needle plate electrode.

2. The DBD plasma-assisted garbage-coal combustion generation device according to claim 1 is characterized in that: The combustion reaction chamber (1) comprises: A combustion chamber (111) for burning garbage; A first high-voltage needle electrode plate (102) and a second high-voltage needle electrode plate (109) are arranged from top to bottom, respectively arranged at two ends of the combustion chamber (111), and used to form a plasma field in the combustion chamber (111); A first porous medium (103) and a second porous medium (108) are respectively arranged on one side of the first high-voltage needle electrode plate (102) and the second high-voltage needle electrode plate (109) close to the combustion chamber (111); A low-voltage mesh electrode (104) is disposed in the combustion chamber (111), and a plasma field is formed in the interval between the low-voltage mesh electrode (104) and the first high-voltage needle electrode plate (102) and the second high-voltage needle electrode plate (109); The low-voltage mesh electrode (104) is provided with a through hole, the garbage is placed above the low-voltage mesh electrode (104), and the coal powder is passed into the combustion reaction chamber (1) from below the low-voltage mesh electrode (104).

3. The DBD plasma-assisted garbage-coal combustion generation device according to claim 2 is characterized in that: A waste gas collecting device (101) is also provided on the top of the combustion chamber (111), and the waste gas collecting device (101) is located above the first high-voltage electrode plate (102).

4. The DBD plasma-assisted garbage-coal combustion generation device according to claim 3 is characterized in that: The waste gas collecting device (101) is connected to a waste gas treatment device (5).

5. The DBD plasma-assisted garbage-coal combustion generation device according to claim 2, characterized in that: A blower (110) is also provided at the bottom of the combustion chamber (111), and the blower (110) is located below the second high-voltage needle electrode plate (109).

6. The DBD plasma-assisted garbage-coal combustion generation device according to claim 2 is characterized in that: A plurality of needle electrodes are provided on one side of the first high-voltage needle electrode plate (102) and the second high-voltage needle electrode plate (109) close to the combustion chamber (111), and the needle electrodes are wrapped with ceramic medium.

7. The DBD plasma-assisted garbage-coal combustion generation device according to claim 6 is characterized in that: The distances from the needle tips of the needle electrodes on the first high-voltage needle electrode plate (102) and the second high-voltage needle electrode plate (109) to the low-voltage mesh electrode are the same.

8. The DBD plasma-assisted garbage-coal combustion generation device according to claim 2 is characterized in that: The second high-voltage needle electrode plate (109) is provided with a coal powder ignition device, and the second high-voltage needle electrode plate (109) is arc-shaped.

9. The DBD plasma-assisted garbage-coal combustion generation device according to claim 2, characterized in that: The combustion chamber side wall is provided with a reaction chamber inspection window (105), a coal powder inlet (107), a coal slag outlet (112) and a garbage mixture inlet (113); the reaction chamber inspection window (105) is provided with a window door (106); the coal powder inlet (107) is connected to the coal powder supply pump (3).

Images