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최대 10 단어까지만 선택 가능합니다.
제안 방법
- In this study, a semi-plant scale test facility, which simulates the same configuration of components in ACU with the same linear velocity and residence time, has been developed to secure the TEDA-AC samples under the simulated operating conditions, such as temperature, relative humidity and poisoning gases, in the NPPs. The TEDA-AC samples periodically taken from the semi-plant scale test facility have been analyzed to confirm the change of its performance during the long term operation by measuring the BET specific surface area, TEDA content, and methyl iodide penetration test.
- Since the aging, weathering and poisoning processes on TEDA-AC are occurred simultaneously, it is not easy to investigate each effect, independently. The best way to investigate the performance of TEDA-AC is to secure the TEDA-AC sample for methyl iodide penetration test from the ACU installed in the NPP. However, this is not possible during the normal operation of the NPP
- The performance of TEDA-AC was investigated with the semiplant scale test facility under the simulated NPP conditions such as at 25 ℃, 50% relative humidity, and the linear velocity of 0.2 m/s corresponding to the residence time of 0.5s, with and without an addition of poisoning gases for up to fifteen months. The TEDA-AC used in this test is the same lot of nuclear grade TEDA-AC manufactured for NPPs.
- The test plans to continue further for twenty four months to examine the performance of TEDA-AC.
- The three test apparatuses had the same IDs of canister and sampling period. The test to secure the periodic TEDAAC samples continued for twenty four months and finished with The TEDA-AC sample for twenty four months of operation.
대상 데이터
- The semi-plant scale test facility was developed to simulate the ACU and equipped with the same configuration and components of ACU used in NPPs. As shown in Fig. 1, the semi-plant scale test facility consists of three test apparatuses and each of those is serially configured with a flow strainer, a demister, an air heater, a prefilter, a HEPA filter and a Type III adsorber. The fan was installed at the downstream of the test facility to suck and form the air flows inside the test facility.
- Each semi-plant scale test apparatus has different conditions of poisoning gas. Eight different poisoning gases, such as formaldehyde, toluene, acetaldehyde, m-Xylene, p-Xylene, ethyl-benzene, SO2 and NO2 were supplied into each semi-plant scale test facilities controlled by the regulator and mass flow controller through the gas cylinders.
- The three test apparatuses were installed inside the environmentally well-controlled room to achieve the steady inlet and atmosphere temperatures and humidity, as shown in Fig. 1. Each semi-plant scale test apparatus has different conditions of poisoning gas.
- The semi-plant scale test facility was developed to simulate the ACU of NPPs. Three test apparatuses installed in the semi-plant scale test facility was designed to have the Type III adsorber with twelve canisters for the TEDA-AC samples. The same thermal-hydraulic conditions, such as the temperature (25 ℃), relative humidity (50%) and linear velocity (0.
- 2, the type III adsorber located after the HEPA filter was designed to have four of four inch beds, which is filled with the TEDA-AC [6]. Twelve canisters (50 mm inner diameter and 100 mm length) were vertically installed at the front and rear of the adsorber to secure the TEDA-AC samples. The size of Type III adsorber was larger than the size of HEPA filter to install 12 canisters and was designed with Eq.
이론/모형
- The Barrett-Joyer-Halenda (BJH) method [9] is used to analyze the meso-pore volume distribution of TEDA-AC. This method is deal with relatively coarse porous adsorbents exhibiting a wide range of pore sizes.
- Thus, the performance of TEDA-AC can be determined by the methyl iodide removal capability. The methyl iodide removal performance of the TEDA-AC was analyzed by the methyl iodide penetration test specified in the ASTM D 3803 [5]. The test conditions for the methyl iodide penetration test are shown in Table 4 where the radioactive methyl iodide (#) concentration is 1.
- The micro-pore volume distribution is analyzed with the Horvath and Kawazoe (HK) method [8]. The HK method is based on slit-shaped pore and basically this method is considered as the molar integral change of the Gibbs free energy.
- The samples were analyzed by using the BET specific surface area, TEDA content and methyl iodide penetration test, which have been conducted from the authorized analysis organization in terms of reliability. The surface area of a TEDA-AC can be analyzed by the BET method [7,10]. An adsorption data for nitrogen at the liquid nitrogen temperature, 77K, are usually used in this method.
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