JPS58112023A - Deodorizing apparatus - Google Patents

Abstract

PURPOSE:To reduce installation cost and to hold stable deodorizing performance, by a method wherein the relative humidity of the a to be treated is detected and the volume of the gas to be treated is adjusted under such a condition that the heat capacity of a heater is made constant to adjust the relative humidity to a predetermined value or less. CONSTITUTION:A gas 2 to be treated sucked by a blower 1 is heated by a heater 5 to raise the temp. thereof. The relative humidity of this gas to be treated is detected by a humidity sensor 4 and the detected signal is sent to the blower 1 through a controller 3. When the relative humidity reaches a predetermined value or more, the blower 1 is controlled by the controller 3 to reduce the volume of the gas to be treated so that the relative humidity of the gas to be treated after temp. rise is held at the predetermined value or less. The gas to be treated of which the relative humidity is controlled is introduced into an adsorbing tower and, while malodorous components therein are removed in good efficiency by an adsorbent 7, discharged to the atmosphere as the treated gas 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deodorizing device, and more specifically,
Adsorption and removal of malodorous components in gas using adsorbents such as activated carbon,
In deodorizing equipment that uses methods such as reactive removal using activated carbon impregnated with chemicals such as acids and alkalis, or oxidative removal using ozone and catalysts, etc., adsorption is achieved by controlling the relative humidity of the gas to be treated to below a predetermined value. This invention relates to a deodorizing device that prevents deterioration of the deodorizing performance of an agent.

Conventional deodorizing equipment detects the humidity of the gas to be treated, and when the detected value is higher than a predetermined value, heats the gas to be treated using steam, an electric heater, etc. to raise the temperature and lower the relative humidity. This prevented a decline in performance. However, with this configuration, it is necessary to always maintain high deodorizing performance even when the humidity of the gas to be treated is saturated.

It was necessary to install a large-capacity heater, which resulted in high equipment costs.

This invention was made in order to eliminate the drawbacks of the conventional ones, and detects the relative humidity of the gas to be treated and adjusts the air flow rate of the gas to be treated under the condition that the heat capacity of the heater is constant. It is designed to keep the relative humidity below a predetermined value, and is suitable for deodorizing gas with high relative humidity such as in sewage treatment plants.

An embodiment of this invention will be described below.

Prior to specific description of Examples, the relationship between trenchless deodorizing performance and relative humidity will be described.

Figure 1 shows a reaction tube filled with 8 to 10 meshes of activated carbon to a bed height of 2 cm, and a gas to be treated containing 25 ppm of hydrogen sulfide (hereinafter abbreviated as 11.S) adjusted to a predetermined relative humidity. It is a characteristic diagram in which the 1-I, 8 removal rate after 24 hours is plotted against the relative humidity of the waste to be treated when the sample is passed at a rate of 14α per second.

This characteristic diagram shows that the H and S removal rate is high until the relative humidity of the gas to be treated reaches 90%.
It can be seen that above 1(,8), the removal rate decreases rapidly, and almost no removal occurs when the relative humidity is saturated.

In addition, for a deodorizing device with a processing air volume of 840 ONrrt per hour, activated carbon of 990115 was used as the adsorbent packed in a glass fiber reinforced plastic adsorption tower with a thickness of 15 mm, and the temperature of the gas to be treated was raised by a heater. The relationship between the dew condensation state of the adsorbent and the relative humidity of the gas to be treated was observed.

As a result, the relative humidity of the gas to be treated exceeds 90% under one of the natural conditions where dew condensation is likely to occur, i.e., the temperature of the gas to be treated is 16 to 18 C, the outside temperature is -8 to -13 tl'. The part of the adsorption layer that is in contact with the outside air through the adsorption tower wall made of glass fiber reinforced plastic is JN.
7. Condensation occurs over a distance of 30 meters or more. It was found that the malodorous components of the gas to be treated passing through that area were released into the atmosphere without being removed. On the other hand, when the relative humidity was 80% or less, the area causing the Km phenomenon became extremely small, indicating that the malodorous components were sufficiently removed.

From the above observation results, the relative humidity of the gas to be treated is 90 degrees or less in a deodorizing device that uses activated carbon lubricant.

A suitable condition is preferably to keep it at 80% or less.

Note that the above relative humidity control value depends on the type of adsorbent and catalyst used, as well as the deodorizing section F! ′! It goes without saying that there are more appropriate values for 1:.

FIG. 2 is a diagram showing the configuration of the main parts of an embodiment of the present invention, in which (1) is a variable air volume blower that sucks the gas to be treated (2), and (3) is the detection by the humidity sensor (4). A controller that controls the blower (1) according to a signal, (5) a heater, (6)
is an adsorption tower filled with an adsorbent (7), (81 is a processing gas).

Next, we will explain the operation of this device: 6° blower (1)
The gas to be treated (2) I drawn from K is.

It is heated by a heater (5) to raise the temperature.

The humidity sensor (4) detects the relative humidity of the waste to be treated. The detected signal is sent to the controller (3) where it is subjected to arithmetic processing, becomes a control signal according to the state of the gas to be treated, and is sent to the blower (1). That is, when the relative humidity reaches 80% or more, the controller (3) controls the blower (1) to reduce the processing air volume, so that the relative humidity of the gas to be processed (2) after temperature rise is always below 80%. It operates to maintain the

In this way, the gas to be treated (2) whose relative humidity has been adjusted to below 80 degrees is introduced into the adsorption tower 16+, and the adsorbent (7
), the malodorous components are efficiently removed and the treated gas +81 is released into the atmosphere.

In the deodorizing device configured in this way, the heat capacity of the heater is
Since it can be set to a small value that can be used most efficiently, equipment costs can be reduced.

In the above embodiments, a deodorizing apparatus using only an adsorption tower is shown, but it is also applicable to a deodorizing apparatus using a wet cleaning tower using a secondary sodium hypochlorite solution, a sodium hydroxide solution, or the like as a cleaning liquid.

Activated carbon is also used as an adsorbent for adsorption towers.

In addition to Vl and 8+ agents such as zeolite, adsorbents impregnated with chemicals such as acids and alkalis, metal oxides such as iron oxide, and catalysts such as platinum can also be used. Furthermore.

It can also be applied to cases where a deodorizing method using these adsorbents and ozone is used.

As described above, according to the present invention, the processing air volume of the gas to be processed is adjusted according to the relative humidity of the gas to be processed and the heat F of the heater, and is controlled so as to always maintain a predetermined humidity or less. This reduces equipment costs and provides stability.

It has the effect of maintaining deodorizing performance.

[Brief explanation of the drawing]

FIG. 1 is a characteristic diagram showing the relative humidity dependence of the H and S removal rate by activated carbon, and FIG. 2 is a diagram showing the configuration of an embodiment of the present invention. In the figure, (1) is the blower, and (2) is the gas to be treated. (31! 4 controllers, (4) is a sensor, (5) is a heater,
! 61! d adsorption tower, (7) is an adsorbent, and (8) is a processing gas. Agent Makoto Kuzuno - (1 other person) Fig. 1 Saib Tasunen Chikara (Mr. Commissioner of the Patent Office 1. Display of case ↑! Gansho 56-411118
! i No. 2, name of the invention ^device 3, amendment will be made to representative Hitoshi Katayama Section S, subject of amendment FIA#lI buttocks Detailed description of invention column 6, content of amendment (1) Next description Correct as follows.

Claims (1)

[Claims] (1) A variable-scenery blower that sends the gas to be treated containing malodorous components to the adsorption tower, a heater that heats the gas to be treated that is introduced into the adsorption tower, and a humidity sensor that detects the relative humidity of the gas to be treated. and a deodorizing device that receives a detection signal from the sensor and controls the air volume of the variable air volume blower so that the detected value of the humidity sensor is kept below a predetermined set value. , placed.