JPS5978909A - Ozone production device - Google Patents

Abstract

PURPOSE:To provide a titled device which increases the density of ozone and economizes energy by constituting said device wherein a heat exchanger for the air introduced therein and the gas to be discharged therefrom is provided, and an oxygen enricher of a membrane sepn. system and a dehumidifier by cooling are combined with a circulation line and are coupled to an ozone generation system. CONSTITUTION:The air introduced into a heat exchanger 3 through a suction hole 7 is subjected to a heat exchange with the used gas to be discharged through an evacuation hole 6, by which the air is cooled and dehumidified, then the dehumidified air is supplied to a circulation line wherein a dehumidifier 2 by cooling and an oxygen enricher 1 are combined. A membrane sepn. system using cellulose acetate or the like is incorporated for the enricher 1 which can produce the oxygen-enriched air having a high oxygen concn. by permeating selectively oxygen with the cooled and dehumidified raw material air with good efficiency. The dry oxygen-enriched air to be drawn from the enricher 1 is more preferably passed through a dryer 5 of an adsorption system, to increase thoroughly the degree of dryness; thereafter the air is fed into an ozone generator 4, and the high-concn. ozone produced with good efficiency is drawn from an ozone draw port 9.

Description

[Detailed description of the invention] This invention relates to an improved ozone production apparatus.

Because ozone is effective for sterilizing tap water, decolorizing and deodorizing wastewater, and decomposing malodorous substances in waste residue,
Equipment that combines an ozone generator is widely used.

However, the ozone generation efficiency in ozone generators is very low, and currently more than 90 inches of power consumption is lost as heat. The production efficiency of ozone depends on the oxygen purity of the raw air, and the higher the concentration, the higher the efficiency. Cryogenic separation methods and adsorption/desorption methods using ceolite have long been known as methods of reducing oxygen concentration in the air, but these methods require that the separator itself consumes a large amount of electricity. Therefore, it was not possible to save energy even when combined with an ozone generator.

In contrast, membrane separation methods that utilize oxygen-enriched membranes that selectively permeate oxygen gas have recently attracted attention because they can be operated with less power. By combining an ozone generator and an oxygen enricher using a membrane separation method, the ozone generation efficiency in the ozone generator can be improved.

This makes it possible to increase the concentration of ozone and to save energy in ozone production. In an oxygen a converter using a membrane separation method, a membrane module is constructed using an oxygen enrichment membrane that selectively permeates oxygen gas.2. Air, which is a raw material, is supplied at high pressure or normal pressure to one space (Feed side) partitioned by this oxygen enrichment membrane, and the other space (Product side) is
By suctioning air to normal or reduced pressure, oxygen-enriched air with a high oxygen concentration is produced through a membrane. The oxygen concentration (CP) of this oxygen-enriched air is determined by the separation coefficient (α), which is an index of the oxygen gas selective permeability of the oxygen-enriched membrane, the operating conditions of the membrane module, the feed side pressure (PF), and the product side pressure. It changes depending on the pressure (PP) setting. These relationships are theoretically expressed by the following equation, regardless of the form of the membrane module.

Qp=X 10o (vol,%) However, γ is Product 1 for Feed9111
jllll(7) represents the pressure ratio (PP/PF), and CF represents the oxygen concentration (vol, %) on the Feed side. From the above formula, the separation coefficient (α) of the oxygen enrichment membrane is set as a parameter,
The relationship between the pressure ratio (γ) and the oxygen concentration (CP) of oxygen-enriched air was determined and shown in FIG. However, 0F=21 vol, %. As is clear from Figure 1, the smaller the pressure ratio, the more oxygen 11c will be produced, or the power required to make Feed 1llll a high pressure or to suck in proauctlB++'Q pressure increases rapidly as the pressure ratio decreases. Practically, pressure ratios in the range 0.1 to 0.5 are used. The oxygen concentration at a pressure ratio of 0.1 to 0.5 is at least 5 gvol. % or more, it is required that the separation coefficient of the oxygen enrichment membrane is at least 4 or more, preferably 6 or more.

The separation coefficient at room temperature of oxygen enrichment membranes currently in practical use is 2.
3. Cellulose acetate or poly-4-methylpentene-1 is used as a compound. The number of polyester samples is 5, and there are no cases exceeding 6. (The separation coefficient of oxygen enrichment membranes depends on temperature.

It increases as the temperature decreases. In this case, the permeability coefficient of oxygen scum is reduced, but this can be compensated for by increasing the membrane area or making the membrane thinner. ) This invention combines an oxygen enricher using a membrane separation method and a cooling dehumidifier through a circulation path.

By combining a system that introduces air and discharges used packaging via a heat exchanger with an ozone generation system, an ozone system that can increase ozone concentration, reduce ozone production, and achieve the /l key. The purpose is to obtain manufacturing equipment.

FIG. 2 is a block diagram showing one embodiment of the present invention.
In the figure, (1) is an oxygen enricher using a membrane separation method, (2)
) is a cooling dehumidifier, (3) is a heat exchanger, (4) is an ozone generator, (5) is an adsorption dryer, (6) is an exhaust hole, (7) is
(8) is a drainage hole, (91 is an ozone outlet).

In the ozone production apparatus configured as described above, the raw air supplied to the ozone generator (41) is required to have a high oxygen concentration and be dry at the same time. In order to increase the separation coefficient of the oxygen enrichment membrane and dry the raw air at the same time by cooling, the arrangement is as shown in Figure 2. A circulation path for gas flow (air flow) is formed between the containers (2), and about 1% of the total gas flow forming the circulation path is taken out from the oxygen enrichment device as dry oxygen-enriched air. , about 1 gvo 10% of gas is exhausted from the circulation path via the heat exchanger (3), and at the same time about 20 vol, % of the air that is insufficient due to the above operation is set to be taken in from the outside air via the heat exchanger. This made it possible to continuously extract oxygen-enriched gas with a constant oxygen concentration.

An oxygen enricher using a membrane separation method uses cellulose acetate, which has an oxygen gas separation coefficient of 3 at room temperature (25°C), or 5
By using an oxygen-enriching membrane made of polyester and cooling the temperature of the raw air to 0 to 10°C with a cooling dehumidifier, the separation coefficient became 4 to T. Therefore, F of the membrane module
Pressure on the eθd side is 2 atm, and pressure on the Product side is 0.
．． By operating with the pressure ratio set to 4 atm, that is, 02, the oxygen concentration will be 5 Q VOI.

A dry oxygen-enriched gas with a temperature of more than 50% was obtained.

By using a (total) heat exchanger that simultaneously exchanges temperature (sensible heat) and humidity (latent heat) as a heat exchanger, the load on the cooling dehumidifier is reduced by bringing in outside air at a lower temperature and humidity. I was able to do that.

Further, in order to sufficiently reduce the degree of dryness of the oxygen-enriched gas, it is preferable to insert an adsorption dryer (5) in front of the herring container (4).

Comparing the ozone production equipment according to the present invention with the conventional ozone generators using air and pure oxygen as raw materials, the ozone concentration (conventional method) was lower than that of In the case of the invention, air was used as the raw material and the amount was 2 to 3. The total power required to produce 1 kg of ozone is 10-20% compared to the conventional method using air as the raw material.
This resulted in a reduction in

As explained above, this invention is a system in which an oxygen enricher using a membrane separation method and a cooling dehumidifier are combined in a circulation path, and air is introduced into the circulation path and used gas is discharged through a heat exchanger. By combining with ozone generating thread,
It is possible to obtain an ozone production device that can increase the concentration of ozone and save energy during ozone production.

[Brief explanation of the drawing]

Figure 1 shows the relationship between the oxygen concentration (VOW) of the oxygen-enriched gas produced by an oxygen enricher using a membrane separation method, the separation coefficient of the oxygen enrichment membrane, and the pressure ratio, which is the continuous operation condition of the membrane module. 2 is a block diagram showing an embodiment of the present invention. In the figure, +11 is an oxygen converter using a membrane separation method. (2) is a cooling dehumidifier, (3) is a heat exchanger, (4) is an ozone generator, (5) is an adsorption dryer, (6) is an exhaust port, (
7) is the intake hole. (8) is a drainage hole, and (9) is an ozone exit port. Agent Makoto Kuzuno - Figure 1 Yuka Yootsu Figure 2 Commissioner of the Patent Office 26 Name of the invention Ozone production device 3 Make an amendment 4. Agent drawing 6 Contents of amendment Figure 1 of the drawing is attached as attached. Correct. B Attached document catalog drawing (Figure 1) 1 or more copies

Claims (1)

[Scope of Claims] (1) It has a circulation path including an oxygen fusuma converter using a membrane separation method that generates oxygen-enriched gas from introduced gas using a separation membrane, and a cooling dehumidifier, an oxygen enrichment system that introduces oxygen, generates oxygen enriched gas, and discharges spent gas, a heat exchanger provided between the air introduced into the circulation path and the gas to be discharged, and the oxygen enrichment system. An ozone production device characterized by comprising a thread that generates ozone based on the obtained oxygen-enriched gas. (21 The thread that generates ozone is characterized by a dryer that dries the oxygen-enriched moving body, and an ozone generator that generates ozone based on the dried oxygen-enriched gas obtained by this dryer. The ozone production apparatus according to Claim W'f. (3) Claim 1, wherein the heat exchanger is a heat exchanger that simultaneously exchanges temperature and humidity. Or the ozone production device according to item 2.