FIELD OF INVENTION

This invention relates to an industrial dehydration unit equipped with high temperature heating roller.

BACKGROUND OF INVENTION

As industrial civilization develops, various industries generate many types of industrial waste. Among the waste, sewage and waste water contain a great amount of moisture and heavy metals in its sludge.

This kind of polluted sludge is mixed with water and penetrates into ground or flows into streams being a part of environmental pollution.

Currently, to dehydrate sludge moisture, a pressure dehydrator that dehydrates sludge through compression roller and electro osmosis dehydrator that passes electricity through sludge are used.

However, the existing pressure dehydrator has sludge in-between it's a pair of filtering belts. The sludge is dehydrated by passing said pair of filtering belts through a compression roller. Under current structure, it is almost impossible to dehydrate more than 75 percent of moisture contained in sludge with a compression roller. To overcome such difficulty, an electro osmosis dehydrator that dehydrates sludge moisture by passing electricity into sludge is developed and operated. However, the use of such dehydration unit might be restricted to dehydration of some types except for metal-containing sludge. In addition, it needs a great amount of consumption electricity. If electricity is applied to sludge, high temperature of sparks would cause filtering belts to be damaged and replaced thereafter frequently. The electricity also goes through part of a roller in the unit and results in minor scale of dehydration effect. Such dehydrator is not efficient.

SUMMARY OF INVENTION

Accordingly, it is an objective of the present invention to provide a dehydration unit that overcomes the limitations of dehydration of moisture led by compression of the existing industrial dehydration unit.

It is another objective of the present invention to provide a dehydration unit to dehydrate any type of sludge.

It is a further objective of the present invention to provide a dehydration unit to prevent a filtering belt from being damaged from high temperature compression and to save money and extend lifespan of a roller by completely preventing net-shaped filtering belt from sludge.

It is yet another objective of the present invention to provide an industrial dehydration unit equipped with high temperature heating roller in order to achieve low power consumption and a big dehydration effect.

The objectives of the present invention are achieved through an industrial dehydration unit that comprises a high-temperature heating roller, a multiple attach chain sprocket which is arranged around the roller and a chain caterpillar. The chain caterpillar comprises of an attach plate to embrace outer part of a sludge lead in/outlet onto the multiple attach chain sprocket surrounding the high temperature heating roller. Between the high temperature heating roller and caterpillar is a Teflon net-shaped filtering belt that is pressed and heated along the high temperature heating roller to dehydrate sludge cake. This is carried out by pressing heating sludge cake with a great deal of moisture with the high temperature heating roller, while keeping the consumption power for the existing industrial dehydrator lowered by distributing whole pressure heat to sides of the high temperature heating roller evenly.

BRIEF DESCRIPTION OF DRAWINGS

Figure 1 shows a perspective view of the dehydration unit of the present invention.

Figure 2 shows a perspective view of a high temperature heating roller of the present invention.

Figure 3 shows a side view example of heating by a high temperature heating roller of the present invention.

DETAILED DESCRIPTION OF INVENTION In the following description, numerous details are set forth to provide an understanding of the present invention. However, it will be understood by those skilled in the art that the present invention may be practiced without these details and that numerous variations or modifications from the described embodiments may be possible.

In the present invention, an industrial dehydration unit for dehydrating sludge cake is provided. The unit has a high temperature heating roller which has a double-layer compression rollers. The double-layer compression rollers can take in heating medium. The high temperature heating roller further has a lead-in section for heating medium on an axis of a roller and an outlet section for heating medium to conduct high temperature heat. The roller is made in the way that the lead-in section and the outlet section of the high temperature heating roller are linked to radial shaped heating medium passage formed along the outer side of a roller.

Further, the unit also contains a multiple attach chain sprocket which is arranged around the roller. The unit also contains caterpillars made up of chains with attach plate which are formed to embrace the outer part of a sludge lead-in/outlet onto the multiple attach chain sprocket surrounding the high temperature heating roller.

A net-shaped filtering belt coated with Teflon is passed through the high temperature heating roller and the caterpillar so that the filtering belt is compressed by the attach plate and heated along the high temperature heating roller to dehydrate sludge cake. The unit in addition comprises a vapor discharge unit which is installed on top of a high temperature heating roller to discharge vapor occurred as a result of dehydration by the high temperature heating roller. An intake unit is installed on the filtering belt to forcibly take in moisture of the sludge cake that still remains after dehydration by the high temperature heating roller.

At least 250 ^° C~300 ^° C high temperature heating roller is required to compress the sludge cake that has a great amount of moisture and heats the sludge cake at high temperature. This is needed so that the moisture remaining in the compressed sludge cake evaporates and the moisture that contains in the sludge cake, which fails to dehydrate by compression, will dehydrate as a result of the high temperature. The present invention will therefore be able to create twice as big a dehydration effect as the existing industrial dehydrator of an electro osmosis dehydrator but with a much lower power consumption than that in use by distributing the whole pressure heat more evenly to the sides of the high temperature heating roller than the existing industrial dehydrator.

The high temperature heating roller has no electric spark and has a longer lifespan of a compression belt, which saves consumption cost of consumption goods. The roller dehydrates any bad type of sludge since it is hardly affected by electric features. Further, the high temperature heating roller used for dehydration is simple in structure. The roller saves manufacturing process and manufacturing price enormously and strengthens durability of a roller, reduces malfunction rate and frequency significantly, and therefore it is an easy and convenient invention to manipulate the unit. The detailed explanation of the present invention in reference to the drawings is shown below.

This invention can be used independently as an industrial dehydration unit, but to maximize sludge dehydration rate, the dehydration unit is composed of the belt press using 1st dehydration means (100) as shown in the Figure 1. (This invention can be made into dehydration unit equipped with various stages of dehydration means by attaching it to an industrial dehydration unit before and after assembly.)

1st dehydration means (100) transfers and dehydrates in pressure sludge that is supplied by sludge supply part (140) and inserted between a top and a bottom part filtering belt (110) consisting of net-shaped filtering cloth by using a number of rollers and discharges sludge cakes.

The 1st dehydration means (100) dehydrates sludge using "S-shaped" belt press (120,130) that is composed of the top and the bottom part filtering belt (110) in zigzags and discharges sludge cake, to maximize dehydration efficiency, make it divided into two stages of the top and the bottom "S-shaped" belt press (120,130).

It is desirable that the filtering belt which consists of the net-shaped filtering cloth be kept widely open in a form of arc in order for it not to be bent or crumbled when transferred by a roller. To prevent such accident, a radial crown roller is recommended. In addition, 2nd dehydration means (200) receives and transfers sludge cakes returned from said 1st dehydration means (100) using filtering belt (210) of 2nd dehydration mean consisting of a pair of top and bottom unit, and high temperature heating roller (220) dehydrates sludge cakes in pressure again that are lying in the filtering belt (210) of the 2nd dehydration mean.

The high temperature heating roller (220) keeps up with 250°C~300°C high temperature, and as shown in the Figure 2, the high temperature heating rollers comprises of a dual layer rollers to take in heating medium. It further comprises of a lead-in section (222) leading heating medium to the axis of high temperature heating roller (220) and an outlet section (223) discharging heating medium. It connects the lead-in section (222) and the outlet section (223) to radial heating medium passage (221) formed along the outside section of a roller. Therefore, heating medium heated at high temperatures by outside heating unit (230) circulates high temperature heating roller (220) and conducts high temperature to a roller.

The high temperature heating roller (220) has a caterpillar (240) to enclose outside section of the high temperature heating roller (220). The caterpillar (240) consists of a multiple attach chain sprocket (241) and the attach chain sprocket (241) is linked to a attach chain (242).

The attach chain (242) is located to the right and the left side of the high temperature heating roller (220), and attach plate (243) is linked to the right and the left side of the attach chain (242) in a united body, just like the caterpillar (240) enclosing the high temperature heating roller (220). This is done in order that the attach plate (243) can press the filtering belt (210) passing through the high temperature heating roller (220) and the caterpillar (240).

The filtering belt (210) is guided to the multiple rollers and to pass through the high temperature heating roller (220) and the caterpillar (240). To make a filtering belt responds to the high temperature roller, coat a filtering belt with Teflon or use Teflon filtering belt. In the 2nd dehydration means, it is desirable that the filtering belt which consists of the net-shaped filtering cloth be kept widely open in a form of arc in order for it not to be bent or crumbled when transferred by a roller. To prevent such accident, a radial crown roller is recommended.

Since the 2nd dehydration means emits high temperature, it is desirable to protect workers from high temperature by installing partitions around the high temperature heating roller to prevent safety accidents.

As shown in the Figure 3, when looking into the high temperature heating roller (220) more closely, a heating unit (230) is linked to the high temperature heating roller (220). Heating medium circulating at high temperature secures the high temperature heating roller (220) and maintains at 250°C ~300°C high temperature. The heating unit (230) consists of a pump (231) that supplies heating medium to the high temperature heating roller (220), a temperature sensor (232) that measures heating medium temperature, and a heater (233) that heats the medium at relevant temperature of 300°C, which leads the high temperature heating roller (220) to keep at the 300°C temperature at all the time.

In addition, when looking into internal structure of the high temperature heating roller (220), it consists of double layers of roller to take in heating medium. In the heating unit (230), heating medium (liquid heating medium: oil, water, etc) keeps up at 300°C or higher, so that high temperature flows into inside the roller starting from the lead-in section (222) through the high temperature heating roller (220) along the heating medium passage (221). High temperature of such heating medium is conducted to the high temperature heating roller (220). Heat-ridden heating medium goes along the heating medium passage (221) and the outlet section (223) and a heating unit (230) discharges it, which makes the high temperature heating roller (220) keep up at 250°C ~300°C high temperature constantly.

A temperature sensor (232) of the heating unit (230) monitors whether the high temperature heating roller (220) maintains at 250°C~300°C temperature. A heater (233) heats heating medium so that the high temperature heating roller (220) keeps at 250°C ~300°C temperature and forcibly circulates heating medium in a pump (231) to reheat heating medium that is ridden of heat to the high temperature heating roller (220).

As shown above, the 2nd dehydration means (200) heats sludge cake with high temperature to dehydrate moisture in evaporation, causing a great amount of vapor. Therefore, a vapor discharge unit (260) is installed on top of the 2nd dehydration means (200) to prevent the unit from vaporization. In other words, a hopper (261) is installed to collect vapor on top of the 2nd dehydration means (200), and at the end of the hopper (261) is the vapor discharge unit (260) which is installed to forcibly discharge vapor.

In addition, to remove moisture remaining in the dehydrated sludge cake between the high temperature heating roller (220) and the caterpillar (240) of the 2nd dehydration means, an intake unit (250) is installed on the filtering belt surface to enable forcible intake of moisture. This helps to dehydrate remaining moisture using the filtering belt surface.

It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the invention as shown in the specific embodiments without departing from the spirit or scope of the invention as broadly described. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.