CN106582185A - Method for removing particulate matters from gas - Google Patents

Abstract

The invention discloses a method for removing particulate matter in gas. New particulate matter is added to the gas to be removed. The purpose of adding new particulate matter is to make the particulate matter in the gas adhere to the added particulate matter through filtering or other methods. The added particles are separated from the original gas to remove the original particles in the gas. The invention improves the efficiency of removing fine particles by adding charged particles into the gas, and basically does not affect the use of existing processes and equipment. Not only is the efficiency higher than that of existing methods, but it is also economical, energy-saving, easy to implement, and can effectively remove fine particles at the PM2.5 level, thereby reducing pollution to the atmosphere.

Description

A method for removing particulate matter from gas

technical field

The invention belongs to the technical field of air pollution prevention and control, and relates to a method for removing particulate matter from gas, in particular to a method for removing particulate matter from gas (air, flue gas, tail gas, etc.).

Background technique

Long-term exposure of humans to airborne pollution particles increases the risk of lung cancer, high blood pressure and other heart and lung diseases, even when particle concentrations are below the legal limit. At this stage, the concentration of particles or other air pollutants will increase in the short term, which will increase the risk of cardiopulmonary disease and other diseases caused by it. Smog weather, especially in northern cities in winter caused by excessive concentration of particulate matter, is extremely harmful to people’s health. At present, my country’s control of particulate matter emissions, in addition to strengthening legislation and standardizing production, is still lacking. Effective method for removing fine particles. In particular, the commonly used bag-type dust removal method is difficult to remove micron-sized particles, while other methods such as water spraying and spraying are affected by factors such as equipment, which makes the economic investment of the enterprise too high and seriously affects the further development of the enterprise.

In the current flue gas tail gas dust removal process, the traditional bag dust removal is not very effective in removing micron-sized particles, especially fine particles that are very harmful to human health. It is unsatisfactory in terms of effective dust removal and reduction of economic investment, which leads to insufficient enthusiasm of enterprises in this regard.

The particulate matter can be effectively removed by activated carbon filtration and adsorption, but there is a problem that the adsorption material is saturated and its adsorption performance is reduced. The present invention effectively solves the problem of stable adsorption performance of the adsorption material.

Contents of the invention

The purpose of the present invention is to provide a method for removing particulate matter in gas. By adding charged particulate matter in gas, the efficiency of removing fine particles is improved, and the use of existing processes and equipment is basically not affected. Not only is the efficiency higher than that of existing methods, but it is also economical, energy-saving, easy to implement, and can effectively remove fine particles at the PM2.5 level, thereby reducing pollution to the atmosphere.

Its specific technical plan is:

A method for removing particulate matter from a gas, comprising the following steps: adding new particulate matter to the gas to be removed, adding new particulate matter to make the particulate matter in the gas adhere to the added particulate matter, by filtering or other means The added particles are separated from the original gas to remove the original particles in the gas.

Further, the particles are millimeter sized spheres to micron sized microspheres.

Further, the particulate material may be polymer material, polymer material, etc., composite material, magnetic composite material, polyethylene foam, polypropylene, plastic, rubber, resin, glass, ceramics. The main feature is insulation, easy to be charged by friction, and can be spherical or ellipsoidal or other shapes that are easy to be charged.

Further, before adding new particles, strengthen their own friction or friction with other materials to make them electrified, or use electrodes to assist their charging, so that the added particles entering the gas will be more charged, forming a stronger electric field around the particles, Thereby enhancing its attraction and attachment to fine particles in the gas.

Further, the volume fraction of the particulate matter added does not exceed 25% of the total volume of the gas.

Still further, the added volume fraction of the particles does not exceed 12% of the total volume of the gas. Adjust according to the concentration of particulate matter removed from the gas.

Properly make the gas form a turbulent flow, so that the gas flows through the surface of the added particle ball as much as possible, so as to increase the attraction and adhesion of the particles to the removed substances in the gas.

Compared with prior art, the beneficial effect of the present invention is:

The invention improves the efficiency of removing fine particles by adding charged particles into the gas, and basically does not affect the use of existing processes and equipment. Not only is the efficiency higher than that of existing methods, but it is also economical, energy-saving, easy to implement, and can effectively remove fine particles at the PM2.5 level, thereby reducing pollution to the atmosphere.

The stable adsorption performance is maintained by cleaning and dust removal of the added particulate matter, which solves the problem of maintaining the adsorption capacity in activated carbon adsorption.

Description of drawings

Fig. 1 is a schematic diagram of the method for removing particulate matter from gas according to the present invention.

detailed description

The technical solution of the present invention will be further described in detail below in conjunction with specific drawings and embodiments.

The present invention adopts a method of adding charged particles (the particle size range of which can be several millimeters to several microns according to the situation) to the gas. The total amount added is not more than 25% of the total volume after mixing, and it is generally recommended not to exceed 12%. , so that the original harmful particles in the gas are impacted or attracted to attach to the added particles. The charged particles can be added by spraying into the airflow or gas, or by other methods, so that the particles can form the effect shown in Figure 1 as much as possible. After particles, the particles are evenly distributed over a path or time.

It can be realized by adding in the existing flue gas treatment process, collecting and recycling after the flue gas (tail gas) channel runs for a certain path (or time), and properly cleaning and treating the added particles for recycling and reuse. Or discarded after multiple uses.

The technical solution of the present invention can spray polyethylene particle balls with low density at the front end of the channel of the existing bag filter system. Barriers are installed in the cross-section of the flue gas channel to form a turbulent state in the flue gas channel, so that the particle balls and the flue gas are fully mixed, and then the particles are filtered out through the bag filter. It is also possible to spray particle balls in the flue gas channel after passing through the bag filter, and then filter them out. According to the content of particulate matter in the flue gas after removal, multiple and multi-point injection and filtration are carried out.

The above is only a preferred specific embodiment of the present invention, and the scope of protection of the present invention is not limited thereto. Any person familiar with the technical field within the technical scope disclosed in the present invention can obviously obtain the simplicity of the technical solution. Changes or equivalent replacements all fall within the protection scope of the present invention.

Claims (6)

1. A method for removing particulate matter in a gas, characterized in that, comprising the following steps: Add new particles to the gas that needs to be removed. The purpose of adding new particles is to make the particles in the gas adhere to the added particles, and to separate the added particles from the original gas by filtering or other methods. Particulate matter removal. 2 . The method for removing particulate matter from gas according to claim 1 , wherein the particulate matter is a microsphere from a millimeter-sized sphere to a micron-sized sphere. 3. The method for removing particulate matter from gas according to claim 1, wherein the particulate matter material is polyethylene foam, polypropylene, plastic, rubber, resin, glass, ceramics. 4. The method for removing particulate matter from gas according to claim 1, characterized in that, before adding new particulate matter, strengthen its own mutual friction or friction with other materials to make it electrified, or use electrodes to assist its electrification at the same time, so that the entering The added particles in the gas are more charged, forming a stronger electric field around the particles, thereby enhancing their attraction and attachment to the fine particles in the gas. 5. The method for removing particulate matter from gas according to claim 1, characterized in that the volume fraction of the added amount of the particulate matter does not exceed 25% of the total volume of the gas. 6. The method for removing particulate matter from gas according to claim 5, characterized in that, the volume fraction of the added amount of the particulate matter does not exceed 12% of the total volume of the gas.