WO2012070892A2

WO2012070892A2 - Air intake/exhaust distribution chamber having cyclically operating valves, and regenerative thermal oxidizer comprising same

Info

Publication number: WO2012070892A2
Application number: PCT/KR2011/009030
Authority: WO
Inventors: 김종석
Original assignee: 주식회사 태종이엔씨; 김은연
Priority date: 2010-11-25
Filing date: 2011-11-24
Publication date: 2012-05-31
Also published as: KR101252236B1; KR20120056446A; WO2012070892A3

Abstract

The aim of the present invention is to fundamentally solve leakage problems caused by an abrasion of rotating portions of conventional rotating disk-type regenerative thermal oxidizers. The regenerative thermal oxidizer of the present invention comprises an air intake/exhaust distribution chamber having cyclically operating valves, and is configured such that a thermal storage tank having a thermal storage material stored therein is divided into sections corresponding to the number of valves. Thus, noxious gases are supplied through a section of the thermal storage tank, and clean gases obtained after combustion are exhausted through another section of the thermal storage tank. In addition, the supply of purge gases is continuously and alternately performed to improve the efficiency of removing contaminants. As a result, the efficiency of using the regenerative thermal oxidizer is maximized while fundamentally preventing noxious gases before treatment and clean gases after treatment from being mixed.

Description

Supply / exhaust distribution chamber with circulating valve and regenerative combustion oxidizer

The present invention is a device that completely processes and exhausts by burning and oxidizing harmful gases containing various odors or volatile organic compounds (VOC) generated in the industrial field, employing a heat storage tank to save more than 95% of fuel for combustion Furthermore, it is a device to treat harmful gases containing high concentration of volatile organic compounds (VOC) with a minimum of auxiliary fuel, and the remaining heat can be utilized as a heat source (heat, fruit boiler, etc.) in the production process. to be.

In detail, the present invention includes a supply / exhaust distribution chamber having a circulating valve, and divides the heat storage tank in which the heat storage material is stored by the number of valves and supplies noxious gas through the heat storage tank at the same time, and cleans the gas after combustion. Exhaust through the heat storage tank and purge supply is continuously crossed and changed (alternatively) to increase the efficiency of removing pollutants, while maximizing utilization efficiency while eliminating the mixing of harmful gas for treatment and clean gas after treatment.

Hazardous gases containing various pollutants are generated at industrial sites, and in the fields involving large-scale painting and coating processes such as shipyards, large amounts of volatile organic compounds are generated and react with light in the air to react with ozone or aldehyde or By producing photo-oxide, it causes environmental pollution such as global warming.

Substances that form volatile organic compounds cause irritating and unpleasant odors even at low concentrations, and when absorbed into the human body through the respiratory tract, cause nervous system disorders, some of which have carcinogenic properties. Emission restrictions are in force. For example, in the case of coating facilities, the legal allowable emission standard is 40ppm or less, but the concentration of exhausted from workplaces such as shipbuilding and furniture manufacturing is about 2,500 ~ 4,000ppm, which requires very strict treatment.

In order to treat harmful gases containing volatile organic compounds generated in the above industrial sites, direct combustion devices and catalytic combustion devices have been used as high-temperature combustion and oxidation treatment devices. Combustion oxidation apparatus (RTO) is typically used.

The conventional regenerative combustion oxidizer allows harmful gas to flow through a plurality of heat storage chambers filled with a heat storage material at a lower end of a combustion chamber, and in this process, preheats harmful gas for treatment by using heat stored in the heat storage material. When the gas reaches the combustion chamber, the gas is heated to a temperature close to the combustion temperature (700 ° C), and heat is recovered in the process of exhausting the high-temperature (800 ° C) clean gas after the combustion through the heat storage chamber again. Finally, the temperature of the clean gas discharged is maintained at a temperature of 30 ~ 40 ℃ higher than the temperature of the low-temperature gas supply. In the conventional regenerative combustion oxidation apparatus as described above, inflow of harmful gas for treatment and exhaust of clean gas after treatment are alternately performed by distribution means.

A representative one of them is disclosed in Korean Patent Laid-Open Publication No. 2003-11036, which is located between the upper fixing plate 41 and the lower fixing plate 42 of the fixed rotating plate 40 and rotates therein, and includes an inflow passage 51. And a disk 50 and drive means 70 for rotating the disk. The disk 50, the upper fixing plate 41 and the lower fixing plate 42, which are the horizontal rotating bodies of the prior art, are all made of metal and have a diameter of about 3 m (in case of a large industrial capacity), so they can be rotated for a long time. The leakage occurs frequently due to the wear of the friction surface between the disk 50 and the upper and

lower fixing plates

41 and 42 which are horizontal rotating bodies. Even if such leakage occurs during operation and the mixing of harmful gas for treatment and clean gas after 1 ~ 2% occurs, a serious problem that does not meet the exhaustion standards arises. Of course, it causes very problems that directly affect the operation of the production facility.

In fact, the 98% level of pollutant removal efficiency during initial operation was rapidly worn out between the disk 50 and the upper and

lower fixing plates

41 and 42 as the operation time passed, resulting in a 3% P removal efficiency in just a few months. As a result, the problem of having to replace and repair each year is rising, and when the space between the disc and the upper and lower fixing plates is left in order to solve such abrasion problem, there is a fundamental limitation that the airtightness itself is inferior.

The present invention is to fundamentally solve the above-described problems of the prior art, completely excludes the mechanical disk and the driving means, and cleans them after a number of treatments such as a plurality of (2n + p) hazardous gas supply valve for treatment. In order to provide a regenerative combustion oxidizer which does not require a rotating body by replacing the supply / exhaust distribution chamber consisting of a gas exhaust valve.

In addition, the present invention is to improve the airtightness, lower the possibility of failure, compared to the conventional disk, multiple disk, drum type, and to provide a low-volume regenerative combustion oxidation apparatus.

The present invention is to provide a regenerative combustion oxidation apparatus that can be used by simply retrofitting the existing disk type to the valve type while providing a supply and exhaust distribution chamber having a circulation-actuated valve.

In order to realize the above problem, the present invention includes a plurality of (2n + p) n air supply valves (for heat dissipation) in the air distribution chamber, of which n is open and the rest are closed, p of the closing valves. Valves to purge.

Where n is the number of valves in charge of the air supply opening function and the number is equal to or greater than the number p of valves in charge of the purge function (n ≧ p).

Correspondingly, the exhaust distribution chamber is provided with the same number of exhaust valves (for regenerative storage), but those in the opposite position to the air supply valve are assembled so that n or n + 1 is opened and the remaining n + 1 or n are It is an invention that the heat storage and heat dissipation occur evenly in all areas of the heat storage tank divided into 2n + p areas by sequentially operating to close.

At this time, all of the air supply valves are operated in a sequential order by circulating in the order of opening → purging (close) → closing → opening.

Since the present invention does not have a rotary disk, wear and tear caused by the rotational portion and the resulting leakage problem are fundamentally solved, the durability of the apparatus is significantly increased, and the possibility of violating the exhaustion standard is greatly reduced.

In addition, the device is simplified by excluding the rotating disk and its driving means, and the effect of reducing the energy use required to obtain the driving force is expected.

In spite of the passage of the operation period, it is expected that the initial efficiency of pollutant removal (99% level) will be maintained continuously.

There is an effect that can be easily improved by the method of converting the supply and exhaust distribution chamber of the rotating disk-type device in the existing installation operation to the supply and exhaust distribution chamber employing the valve of the present invention.

Figure 1. Structure diagram of the prior art

Figure 2. Exploded perspective view of a variable part of the prior art

Figure 3. System decomposition diagram according to the present invention

Figure 4. Valve arrangement plan according to the invention

Figure 5. Illustration showing the arrangement of the valve according to the present invention and the operation sequence of the valve

Figure 6. Supply and exhaust state diagram of the present invention 1

Figure 7. Supply and exhaust state diagram of the present invention 2

3 combustion chamber, 4 exhaust distribution chamber, 5 heat storage tank

7 Inlet duct 8 Exhaust duct 10 Bypass pipe 11 Purge valve

51,52,53,54,55

Supply valve

61,62,63,64,65 Exhaust valve

As a specific embodiment for achieving the above object of the present invention will be described in detail through the accompanying drawings.

According to Fig. 3, the regenerative combustion oxidizer having a circulating actuating valve of the present invention is provided with a combustion chamber in the upper portion of the cylinder and a lower portion thereof and is provided with 2n + p regions by a partition wall extending from the central axis to the circumference in the radial direction. A heat storage tank provided at a lower portion of the heat storage tank and a heat storage tank including 2n + p air supply valves 50 corresponding to the partitioned heat storage tank to supply noxious gas to the combustion chamber through the heat storage tank. And a supply / exhaust distribution chamber 4 composed of an exhaust distribution chamber including the same number of exhaust valves 60 for discharging the clean gas processed therethrough.

As a result, it is preferable that one air supply valve and one exhaust valve are paired in each of the divided heat storage tanks so that the heat storage tank, the air supply valves, and the exhaust valves each have 2n + p numbers.

The number of heat storage compartments, the air supply valve and the exhaust valve shall be determined in consideration of the processing capacity and precision, but these three types of components have the same quantity such as five, seven, nine (p = 1). It is desirable in terms of equipment optimization. However, these three types of components are not necessarily limited to the same number, and it is necessary to maintain a constant drainage relationship with each other in order to maintain the temperature of the heat storage tank uniformly.

As shown in FIG. 4, an operation process will be described as an example, in which five air supply valves and exhaust valves provided in the air supply distribution chamber and the exhaust distribution chamber are five (n = 2, p = 1), respectively.

In this case, the heat storage tank is partitioned into five regions by coaxially extending partition walls. However, the partition wall partitioning the heat storage tank may be divided into concentric circles, and may be provided to have various shapes such as a rectangular shape as necessary to minimize the size of the installation and the installation space.

As shown in Fig. 4, the present invention includes five air supply valves 51 to 55 at equal intervals along the same distance in the circumferential direction from the central axis of the outer air distribution chamber, and five exhaust valves 61 to the inner exhaust distribution chamber. 65). The air supply distribution chamber provided with the air supply valves 51 to 55 communicates with the inflow duct 7 and receives a harmful gas for treatment to supply the combustion chamber to the combustion chamber through the heat storage tank, and the exhaust valves 61 to 65 are provided. The distribution chamber communicates with the exhaust duct 8 to exhaust the treated clean gas into the atmosphere. The air distribution chamber and the exhaust distribution chamber are divided into spaces by a housing having concentric partitions, which are well known as shown in FIG.

5 specifically illustrates the order in which the valve of the present invention is operated. 5 is a case where five supply valves and five exhaust valves (n = 2, p = 1) are operated in the following order.

Table 1

<When the number of open valves is greater than the number closed

step	Open (air supply / exhaust)	Fuzzy Air Supply	Closed (air supply / exhaust)
One	51,52 / 61,62	55	53,54 / 63,64,65
2	52,53 / 62,63	51	54,55 / 64,65,61
3	53,54 / 63/64	52	55,51 / 65,61,62
4	54,55 / 64,65	53	51,52 / 61,62,63
5	55,51 / 65,61	54	52,53 / 62,63,64

According to the step-by-step operation sequence as described above, the five-stage heat storage tank operates in order to maintain the temperature uniformly in all regions by repeating heat radiation and heat storage sequentially. To this end, the present invention is provided with a control means (not shown) for operating the air supply valve and the exhaust valve in accordance with the above operation sequence, it is preferable that the provided valves are provided with an electronic valve that operates in accordance with the electrical signal. The above embodiment explains that each of the valves is sequentially operated so that each of n supply and exhaust air is opened, n supply air and n + 1 exhaust gas are closed, and one supply air is purged. At this time, the purge is not operated to the combustion chamber from the heat storage tank section connected to the air supply valve, which is opened for the first time, and the remaining gas is not directly discharged to the exhaust side, and is sent back to the front of the air supply valve. do.

If there are 7 valves (n = 3, p = 1), each 3 (n) of supply / exhaust opens, 3 (n) of supply and 4 (n + 1) of exhaust close, and one supply In order to purge operation, all the valves are provided in order to rotate indefinitely alternately.

At this time, it is possible to have two or more valves in charge of purge, but in order to maximize the heat storage function, it is desirable to minimize the number of valves in charge of purge, and in any case, the number of air supply valves in charge of purge. (p) is not to be greater than the number of open valves (n).

In another embodiment, the operation of the air supply valve is the same as described above, but the number of opening (n) and closing (n + p) of the exhaust valve may be reversed. That is, 3 (n + p) exhaust valves, which are assumed to be 5 (n = 2, P = 1), are opened and 2 (n) are closed to operate in the following order. .

TABLE 2

step	Open (air supply / exhaust)	Fuzzy Air Supply	Closed (air supply / exhaust)
One	51,52 / 61,62,63	55	53,54 / 64,65
2	52,53 / 62,63,64	51	54,55 / 65,61
3	53,54 / 63,64,65	52	55,51 / 61,62
4	54,55 / 64,65,61	53	51,52 / 62,63
5	55,51 / 65,61,62	54	52,53 / 63,64

6 is a pre-heating and cooling of the corresponding heat storage tank is supplied as the harmful gas for treatment is supplied along the heat storage tank compartment arranged on the left side according to the operation of the first stage valve, and simultaneously cleaned after heating along the heat storage tank compartment arranged on the right side. As the gas is exhausted, heat accumulation in the heat storage tank and cooling of the exhaust gas are shown.

7 is a pre-heating and cooling of the corresponding heat storage tank is supplied as the harmful gas for treatment is supplied along the heat storage tank compartment arranged on the right side according to the operation of the two-stage valve, and simultaneously cleaned after heating along the heat storage tank compartment arranged on the left side. As the gas is exhausted, heat accumulation in the heat storage tank and cooling of the exhaust gas are shown. 6 and 7 are provided with a purge valve 11 in accordance with the purge operation of the air supply valves 51 to 55 in sequence to guide the harmful gas remaining in the pipe connected to the air supply valve to the air supply side untreated pollution Prevent residual gas from being discharged to the atmosphere along the exhaust line.

Afterwards, the three to five stage valves operate according to the same principle to switch the supply and exhaust zones sequentially so that all areas of the five compartments of the heat storage tank are kept at a uniform temperature.

The regenerative combustion oxidation apparatus of the present invention is provided with a blower at the inlet side of the inlet duct (7), and further includes a bypass pipe (10) directly connected to the chimney from the combustion chamber in order to prevent the high temperature of the combustion chamber.

The regenerative combustion oxidizer of the present invention includes a valve type supply / exhaust distribution chamber. In the regenerative combustion oxidizer installed in accordance with the prior art, the upper and lower fixed

plates

41 and 42 and the horizontal rotating plate 50 are provided. It is possible to easily modify and use the existing equipment in a way to replace the fixed passage 40 made of the valve-type supply and exhaust distribution structure of the present invention. At this time, the existing compartment heat storage tank and the combustion chamber can be utilized as it is.

Claims

Used in regenerative combustion oxidizer with combustion chamber and heat storage tank,

2n + p air supply valves are provided in the air supply distribution chamber which receives harmful gas for processing and supplies the combustion chamber through a plurality of partitioned heat storage tanks.

Discharge distribution for regenerative combustion oxidizers, characterized in that an exhaust valve having the same number (or an integer multiple) is provided in an exhaust distribution chamber in which clean gas treated from a combustion chamber is supplied through a plurality of partitioned heat storage tanks and exhausted to an exhaust duct. room.

Where n = number of supply valves in open operation, p = number of supply valves in purge operation
The method of claim 1,

Of the air supply valve 2n + p n alternately open, n closed, p purge function in order to alternately operate,

And n or n + 1 of the exhaust valves 2n + p are alternately operated to sequentially perform the functions of opening, n + 1 or n closing functions of the exhaust valve.
The method of claim 2,

Distributing chamber for supply and exhaust of the regenerative combustion oxidizer, characterized in that p = 1.
Combustion chamber,

A heat storage tank divided into a plurality of regions,

A supply / exhaust distribution chamber having an air supply valve and an exhaust valve,

The number of compartments of the heat storage tank, the number of air supply valves and the number of exhaust valves are 2n + p (or an integer multiple thereof), respectively.

Regenerative combustion oxidizer which is sequentially operated to perform n open, n closed and p purge function of the supply valve 2n + p.
The method of claim 4, wherein

The regenerative combustion oxidation device, characterized in that the purge valve 11 is further provided as many as the air supply valve.
The method of claim 4, wherein

A partition wall for partitioning the heat storage tank is a regenerative combustion oxidation device, characterized in that partitioned radially or concentrically.
The method according to any one of claims 4 to 6,

And the air supply valve is cyclically cycled in the order of opening → purging → closing → opening, and the exhaust valve is cycled in the order of opening → closing → opening.