阅读说明：本技术 一种多种频次脉冲放电高温烟气集尘装置及集尘方法 (Multi-frequency pulse discharge high-temperature flue gas dust collection device and dust collection method ) 是由 刘道清 孙剑 李咸伟 杨军 俞勇梅 胡子国 于 2021-02-23 设计创作，主要内容包括：本发明公开了一种多种频次脉冲放电高温烟气集尘装置及集尘方法,包括进风口、壳体、高压低频放电极、低压高频放电极、集尘极和出风口,所述进风口和出风口分别设置于壳体的前后两端,所述高压低频放电极设置于壳体的内部前端,若干个所述低压高频放电极均匀设置于壳体的内部中间位置,若干个所述集尘极横向均匀设置于所述低压高频放电极之间；所述高压低频放电极和集尘极组成高压放电集尘区域,所述低压高频放电极和集尘极组成低压放电集尘区域。本发明通过用不同的放电距离来迎合不同的放电电压,并针对性的采用不同频率的脉冲放电来分级筛出不同粒径的颗粒物,用不同的针对性捕捉手段来达到最终提升整体拦截过滤效果。(The invention discloses a multi-frequency pulse discharge high-temperature flue gas dust collecting device and a dust collecting method, wherein the multi-frequency pulse discharge high-temperature flue gas dust collecting device comprises an air inlet, a shell, high-pressure low-frequency discharge electrodes, low-pressure high-frequency discharge electrodes, dust collecting electrodes and an air outlet, wherein the air inlet and the air outlet are respectively arranged at the front end and the rear end of the shell; the high-voltage low-frequency discharge electrode and the dust collecting electrode form a high-voltage discharge dust collecting area, and the low-voltage high-frequency discharge electrode and the dust collecting electrode form a low-voltage discharge dust collecting area. The invention caters for different discharge voltages by using different discharge distances, screens out particles with different particle sizes by pertinently adopting pulse discharge with different frequencies, and finally improves the overall interception and filtration effect by using different pertinence capturing means.)

1. The utility model provides a multiple frequency pulse discharge high temperature flue gas dust collecting device, its characterized in that includes air intake (1), casing (2), high-pressure low frequency discharge electrode (3), low pressure high frequency discharge electrode (4), collection dirt utmost point (5) and air outlet (6), air intake (1) and air outlet (6) set up respectively in the front and back both ends of casing (2), high pressure low frequency discharge electrode (3) set up in the inside front end of casing (2), a plurality of low pressure high frequency discharge electrode (4) evenly set up in the inside intermediate position of casing (2), a plurality of collection dirt utmost point (5) transversely evenly set up in between low pressure high frequency discharge electrode (4).

2. The multi-frequency pulse discharge high-temperature flue gas dust collecting device according to claim 1, wherein: the high-voltage low-frequency discharge electrode (3) and the dust collecting electrode (5) form a high-voltage discharge dust collecting area, and the low-voltage high-frequency discharge electrode (4) and the dust collecting electrode (5) form a low-voltage discharge dust collecting area.

3. The multi-frequency pulse discharge high-temperature flue gas dust collection method is used for the multi-frequency pulse discharge high-temperature flue gas dust collection device in claim 2, and is characterized by comprising the following steps of:

the first step is as follows: the flue gas enters the shell (2) from the air inlet (1);

the second step is that: the high-voltage low-frequency discharge electrode (3) discharges electricity, and the dust collecting electrode (5) adsorbs dust with large particle size;

the third step: the small-particle-size dust enters a low-voltage discharge dust collection area;

the fourth step: the low-voltage high-frequency discharge electrode (4) discharges electricity, and the dust collecting electrode (5) adsorbs small-particle-size dust;

the fifth step: the flue gas after dust removal is discharged from the air outlet (6).

4. The multi-frequency pulse discharge high-temperature flue gas dust collection method according to claim 3, wherein: the high-voltage low-frequency discharge electrode (3) in the second step discharges pulse voltage with high voltage and low frequency.

5. The multi-frequency pulse discharge high-temperature flue gas dust collection method according to claim 3, wherein: the low-voltage high-frequency discharge electrode (4) in the fourth step discharges pulse voltage with high-frequency and low-voltage.

Technical Field

The invention relates to the technical field of industrial flue gas purification, in particular to a high-temperature flue gas dust collecting device and method with multiple frequency pulse discharge.

Background

At present, the emission reduction of particulate matters becomes one of the environmental protection tasks which are not slow in China, and the emission reduction capability of the particulate matters matched with various production processes becomes an important index of the sustainable development capability of the colleges and universities. The efficient emission reduction of flue gas particulate matter dust of coal-fired enterprises, especially large-scale coal-fired enterprises, becomes a great concern for China and society.

The means commonly used in the field of dust removal at present mainly comprise several technologies such as cyclone dust removal, bag dust removal, traditional electrostatic dust removal and the like, and the technologies can generally show good treatment efficiency when treating particles with larger particle sizes, but show the condition of obviously insufficient efficiency to different degrees when the particle sizes are as small as micron-sized or even small (lower 5 microns) level.

The smoke dust with small particle size is difficult to be charged with enough intensity in one discharging process due to small self mass and low capacitance value, and the weaker potential difference is difficult to be captured by a counter electrode (dust collecting electrode). Increasing the voltage of the discharge electrode can increase the charge intensity, but the voltage has to correspondingly increase the electrode spacing to avoid arcing, and the longer the spacing, the more difficult the particles are moved to be adsorbed on the collector, and the increasing and decreasing of the electrodes cause dilemma, which leads to low efficiency of capturing small particles.

Based on the above, the invention designs a multi-frequency pulse discharge high-temperature flue gas dust collecting device and a dust collecting method, so as to solve the above problems.

Disclosure of Invention

The invention aims to provide a multi-frequency pulse discharge high-temperature flue gas dust collecting device and a dust collecting method, which aim to solve the problems that the prior art provided by the background art can generally show good treatment efficiency when treating particulate matters with larger particle sizes, but the efficiency is obviously insufficient to different degrees when the particle sizes are as small as micron level, even small micron (lower than 5 microns).

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a multiple frequency pulse discharge high temperature flue gas dust collecting device, includes air intake, casing, high-pressure low frequency discharge electrode, low pressure high frequency discharge electrode, collection dirt utmost point and air outlet, air intake and air outlet set up both ends around the casing respectively, high pressure low frequency discharge electrode sets up in the inside front end of casing, a plurality of low pressure high frequency discharge electrode evenly sets up in the inside intermediate position of casing, a plurality of collection dirt utmost point transversely evenly set up in between the low pressure high frequency discharge electrode.

As a further scheme of the invention, the high-voltage low-frequency discharge electrode and the dust collecting electrode form a high-voltage discharge dust collecting area, and the low-voltage high-frequency discharge electrode and the dust collecting electrode form a low-voltage discharge dust collecting area.

A multi-frequency pulse discharge high-temperature flue gas dust collection method is used for the multi-frequency pulse discharge high-temperature flue gas dust collection device and comprises the following steps:

the first step is as follows: the flue gas enters the shell from the air inlet;

the second step is that: discharging the high-voltage low-frequency discharge electrode, and adsorbing dust with large particle size by the dust collecting electrode;

the third step: the small-particle-size dust enters a low-voltage discharge dust collection area;

the fourth step: discharging by a low-voltage high-frequency discharge electrode, and adsorbing small-particle-size dust by a dust collecting electrode;

the fifth step: and the flue gas after dust removal is discharged from the air outlet.

As a further scheme of the invention, the high-voltage low-frequency discharge electrode in the second step discharges pulse voltage with high voltage and low frequency.

In a further embodiment of the present invention, the low-voltage high-frequency discharge electrode in the fourth step discharges a pulse voltage of a second high-frequency low voltage.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention solves the problem that the traditional electrostatic dust collection mode can only find the optimal balance position in high-voltage arc discharge and low-voltage low-efficiency. Different discharge distances are used for meeting different discharge voltages, pulse discharges with different frequencies are pertinently adopted for screening out particles with different particle sizes in a grading way, and different pertinence capturing means are used for achieving the purpose of finally improving the overall intercepting and filtering effect;

(2) the invention firstly carries out high-voltage low-frequency pulse discharge on the flue gas, thereby achieving two purposes: the particulate matter with relatively large particle size is adsorbed and reduced, and coarse filtration is provided for treating smaller particle size particulate matter with rear end concentration efficiency: pre-boosting the smoke, and providing higher potential difference for finer interception at the rear end as help;

(3) the invention purifies the components of the smoke after high-voltage low-frequency discharge into finer particle size particles, and then, a second round of high-frequency low-voltage discharge dust collection is carried out in a low-voltage discharge dust collection area with a closer distance of a discharge electrode, the discharge voltage of the round is lower, electric arcs can be avoided, the distance arrangement of dust collection electrodes is compact, the dust collection distance is smaller, the smoke can be captured more easily, in addition, the electrostatic adsorption coulomb force is not weak because the smoke also keeps the discharge boosting of the high-voltage discharge dust collection area, the efficiency of the electrostatic adsorption coulomb force and the efficiency of the high-voltage discharge dust collection area are superposed to.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a multi-frequency pulse discharge high-temperature flue gas dust collecting device according to the present invention;

FIG. 2 is a schematic flow chart of a multi-frequency pulse discharge high-temperature flue gas dust collection method according to the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. an air inlet; 2. a housing; 3. a high-voltage low-frequency discharge electrode; 4. a low-voltage high-frequency discharge electrode; 5. a dust collecting electrode; 6. and (7) air outlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Referring to fig. 1, the present invention provides a technical solution: the utility model provides a multiple frequency pulse discharge high temperature flue gas dust collecting device, includes air intake 1, casing 2, high-pressure low frequency discharge electrode 3, low pressure high frequency discharge electrode 4, collection dirt utmost point 5 and air outlet 6, air intake 1 and air outlet 6 set up both ends around casing 2 respectively, high-pressure low frequency discharge electrode 3 sets up in the inside front end of casing 2, a plurality of low pressure high frequency discharge electrode 4 evenly sets up in the inside intermediate position of casing 2, a plurality of collection dirt utmost point 5 transversely evenly set up in between the low pressure high frequency discharge electrode 4.

Specifically, the high-voltage low-frequency discharge electrode 3 and the dust collecting electrode 5 form a high-voltage discharge dust collecting area, and the low-voltage high-frequency discharge electrode 4 and the dust collecting electrode 5 form a low-voltage discharge dust collecting area.

The high-voltage discharge dust collection area is composed of a high-voltage low-frequency discharge electrode 3 and a dust collection electrode 5, the distance between the high-voltage discharge electrode and the dust collection electrode is long, the working voltage is high, the pulse frequency is low, the particulate matter with large relative particle size is well captured and intercepted, and meanwhile, due to the fact that the separation distance between the high-voltage discharge electrode and the dust collection electrode is long, the contact air area is large, and the high-voltage discharge dust collection area can also conduct potential difference boosting and power.

The low-voltage discharge dust collection area is composed of a low-voltage high-frequency discharge electrode 4 and a dust collection electrode 5 which are close to each other, the working voltage is lower, the pulse frequency is higher, and the capacitance value of small-particle-size particles is lower, so that the small-particle-size particles are easy to lose self voltage (namely lose electrostatic adsorption capacity) when contacting with air, therefore, the small-particle-size particles need to be charged and refreshed at high frequency, the high-voltage state can be maintained, and further, enough coulomb force is generated, and the small-particle-size particles can be captured by the; and the low-voltage discharge dust collection area is composed of a plurality of groups of low-voltage high-frequency discharge electrodes 4 and dust collection electrodes 5 which are arranged, the working principles are continuously superposed, and the interception and capture rate of the smoke dust is effectively enhanced.

Referring to fig. 2, a method for collecting dust from high temperature flue gas by multiple-frequency pulse discharge is used in the above-mentioned device for collecting dust from high temperature flue gas by multiple-frequency pulse discharge, and includes the following steps:

the first step is as follows: the flue gas enters the shell 2 from the air inlet 1;

the second step is that: the high-voltage low-frequency discharge electrode 3 discharges electricity, and the dust collecting electrode 5 absorbs dust with large particle size;

the third step: the small-particle-size dust enters a low-voltage discharge dust collection area;

the fourth step: the low-voltage high-frequency discharge electrode 4 discharges electricity, and the dust collecting electrode 5 adsorbs small-particle-size dust;

the fifth step: the flue gas after dust removal is discharged from the air outlet 6.

Specifically, the high-voltage low-frequency discharge electrode 3 in the second step discharges a pulse voltage with a high voltage and a low frequency.

Specifically, the low-voltage high-frequency discharge electrode 4 in the fourth step discharges a pulse voltage of a high-frequency second low voltage.

In practical application, the discharge of the high-voltage low-frequency discharge electrode 3 can achieve two purposes: 1. carrying out adsorption reduction on particles with relatively large particle size, and providing coarse filtration for treating particles with smaller particle size at the rear end with centralized efficiency; 2. the smoke is pre-boosted, and a higher potential difference is provided for finer interception of the rear end as assistance.

The flue gas is through the high pressure low frequency discharge 3 discharge adsorption back composition purification for more tiny particle diameter particulate matter, carry out the second round high frequency low voltage discharge collection dirt by the nearer low pressure discharge collection dirt region of discharge electrode distance this moment again, the voltage of this round of discharge is lower, can avoid electric arc, the interval arrangement of collection dirt utmost point 5 closely makes the collection dirt distance littleer seizure smoke and dust of changing, and because the flue gas still remains the boost that the regional discharge of high pressure discharge collection dirt was collected to the high pressure discharge and makes the electrostatic absorption coulomb power not weak, the two efficiency superposes the increase, the dust collecting effect is better.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.