JPH07506759A - Gas purification method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Gas purification method The present invention relates to a method for purifying gas such as combustion gas. In the method, nitrogen oxides By adding alkali to sulfur oxides, electron beams flying from an electron source can be It is converted into solid particles by the process.

Today, the most commonly used method for purifying combustion gases is through electric filters. This method uses a filter to remove solid particles and slaked lime. The slaked lime is used in the combustion process It combines with some of the sulfur oxides formed during this process and is pumped into the boiler's furnace.

This slaked lime dust is then passed through an electric filter where all other solid particles are trapped. filtered. Usually, no attempt is made to remove nitrogen oxides, but combustion The temperature is maintained at low temperatures at all times and is designed to reduce the amount of nitrogen oxides produced. It is measured. Theoretically, at lower temperatures, the amount of heath produced should not decrease. However, since power plants usually produce electricity according to a logical Carnot mechanism, , as the temperature difference used in the mechanism decreases, the efficiency of electricity generation decreases. mosquito The efficiency of the Renault mechanism is (Tz-T+)/T2 (T, >T,). i.e. In order to reduce the boiler temperature to very low temperatures, efficiency must be reduced significantly. Must be. Additionally, power plants are designed to maintain combustion gases at high temperatures. Designed. At these high temperatures, the combustion gases become very strongly ionized and magnetically By applying a field, charge carriers are separated to a collection surface of opposite charge. electricity can be generated directly from these charge carriers. Then, if If nitrogen is present, it will definitely burn to form nitrogen oxides. Wet cleaning is the most common However, by adding a combustion gas cleaning method to the first purification method described above, Typically 80% of the sulfur can be removed. Even these cleaning methods are expensive Nitrogen oxides cannot be removed without special chemicals. In addition, wet washing A major drawback of the purification method is that a large amount of wastewater is usually purified and recycled.

Today, electric filters are very good at removing solid materials. probably, These major drawbacks are the It depends on the duration of the wire.

In addition to removing solid materials, the purpose of the present invention is to effectively remove most of the Sow and No. The goal is to establish a gas purification method to remove the gas.

The object of the invention is achieved by the method characterized in the claims. Ru.

In the method of the invention, particles in the gas that are charged by the electron beam are By applying an electromagnetic field of 6, it is guided and collected onto a collection surface. This collection table The surface is cleaned at desired time intervals. In this method, dusty slaked lime or similar materials are added into the boiler furnace. The slaked lime and similar materials are Part of the sulfur oxides, either directly or together with moisture in the combustion gases or added water. Removes and neutralizes nitric and sulfuric acids formed in the electron beam of NO and SO2 (No + electron beam → NO! + H20 → HNO3; Son + electron beam → S 03+H, O→Hz S Oa). In addition to slaked lime, ammonium added to the combustion gas Monium can also act as a neutralizing agent. In other words, electron beam converts weakly reactive No and SCh into effectively reactive nitric acid and sulfuric acid.

The nitric and sulfuric acids are neutralized by a base to salts that form solid particles. This is public Although it is a well-known technology, there is no need to simply create an effective electronic video camera that has good efficiency and is not expensive. has not been used until now because system equipment was not available. . According to early methods, the combusted nitrogen and sulfur are converted into solid materials and then Removed by electric filter. In the present invention, an electron beam is applied to the Immediately after, all solid particles become strongly negatively charged by the electron beam. Therefore, charging of particles is promoted. By charging it and applying an external electromagnetic field. The particles can be guided to the required position. The electron beam current is extremely For example, a 100 MW power generation plan with 330 keV electrical energy. At this point, the electron beam current is 300A. Same size coal power plant , the current required by the electric filter (amount of combustion gas per second: 20 0m3) is 100m2/m'0.1mA-2A. i.e. ionization If calculated without any effect, the current of the electron beam is more than 100 times as large. Let me rephrase it For example, considering that the electron beam voltage is about five times higher than the gas discharge voltage, Ionization in an electron beam is much more effective than ionization in a gas discharge. found to be effective. Therefore, the effect on ionization in the electron beam device is The applied force is approximately 100 0 times thicker (for this reason, the distance between the collection sheets can be made longer and the collection area This means that the area can be made smaller.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Figure 1 shows the present invention. FIG. 2 is an alternative embodiment of the method.

In FIG. 1, an electron beam source 1 is installed near the combustion channel 9; An electron beam 3 is injected by an electron beam source 1 into a gas stream 2 in a combustion channel 9. be done. After passing through the electron beam, the gas is ionized and the aforementioned reactions occur.

That is, within region 4, most of the nitrogen oxides and sulfur oxides are converted into solid particles. The particles are then negatively charged by the electron beam. Gas progresses a little further During this process, the negatively charged particles are guided between the collection sheets 5 by the electromagnetic field 8. It will be done. In this embodiment, the electromagnetic field 8 is arranged in a ring-shaped mechanism (or Produced economically by organ. Between the collection sheets 5 , there is an electric field 6 perpendicular to the gas flow and separating one sheet from the other.

The electromagnetic field acting as a collector 6 forces the solid material onto the surface of another collection sheet 7. to collect.

From the surface of the other collection sheet 7, for example, due to mechanical impact or rapid electrical The opposite impact removes the solid material.

In Figure 2, charged particles are continuously collected by a collection induction electric field 10.11. It is collected on sheet 5. The collection sheet is charged with a positive potential caused by the object.

Furthermore, between the collection sheets there is a collector 6 for separating the sheets. 2 or more in a row There may be a set of collection sheets (the collection induction electric field 11 is separated from the collector 1). 2 may be controlled. The collectors 12 are at different potentials, e.g. The shape is as follows. Furthermore, the collection sheet may be in several layers. in this case In , each layer is charged to a higher potential than the preceding layer, i.e., all other Each sheet is charged to a high potential. Of course, it is actually quite complicated, but The drawing schematically depicts the removal of solid material at different potentials, for example.

The invention is not limited to the embodiments shown, but may be modified according to the claims. It can also be applied to purify gases other than combustion gas.

FIG.I FIG.2 Continuation of front page (51) Int, C1, 6 identification code Office reference number BOID 53150 B 03 C3/38 9153-4D6953-4D 6953-4D (81) Designated countries EP (AT, BE, CH, DE.

DK, ES, FR, GB, GR, IE, IT, LU, MC, NL, PT, S E), 0A (BF, BJ, CF, CG, CI, CM, GA, GN, M L, MR, SN, TD.

TG), AT, AU, BB, BG, BR, CA, CH.

C3, DE, DK, ES, FI, GB, HU, JP, KP, KR, LK, LU, MG, MN, MW, NL, N.

, NZ, PL, PT, RO, RU, SD, SE, UA.

S FI BOLD 53/34 124 Z AB

Claims (5)

[Claims] 1. By adding a base, the quantum beam (3) flying from the electron source (1) Purify gases such as combustion gases by converting nitrogen oxides and sulfur oxides into solid particles. A method in which charged particles within an electron beam are stimulated by an external electric field for a desired time. This is collected on a collecting sheet (5) which is cleaned at intervals and guided into a layer (7). A gas purification method characterized by: 2. The particles charged by the electron beam (3) are a continuous set of two or more, Guided by specific collection guidance fields (10, 11) between the collection sheets (5) The gas purification method according to claim 1, characterized in that: 3. An organ (12) at a different potential than the collection sheet forms a collection field. used between the collection sheet and the wall of the combustion channel to The gas purification method according to claim 2. 4. The collection sheet (5) consists of several layers, and every other layer has a high The gas according to any one of claims 1 to 3, characterized in that the gas has a high potential. How to do it. 5. The solid material collected on the collection sheet (5) has a polarity opposite to the voltage of the collection field. Claims characterized in that the invention is removed by a rapid electrical impulse having a The gas purification method according to any one of paragraphs 1 to 3.