JPH02192548A - Absorptive type freezer - Google Patents

Abstract

PURPOSE:To remove or reduce harmful ions present in absorptive liquid acting as flashing liquid by a method wherein a purifying mechanism is mounted in a pipe for absorptive liquid and a pipe for refrigerant in an absorptive type freezer having aqueous solution of halogenated alkaline metal as absorptive liquid. CONSTITUTION:Solution 5 within an evaporator 1 is circulated and agitated by a pipe 3 and a pump 4 from below the evaporator 1. Condensate 6 water cooled by a condensor 2 and condensed is fed to a pipe 7 and absorbed into a pipe 3. The solution 5 is absorptive liquid and contains a little additive agent. A cartridge type purifier 8 is filed with zeolite acting as purifier agent 9, mounted in a bypassing pipe 10 installed in the pipe 3 and its flow rate is adjusted by a valve 9 arranged in the pipe 3, a valve 11 and a valve 11a arranged across the purifying unit 8 in the bypassing pipe 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to the purification of absorption liquid and refrigerant in an absorption refrigerator, and particularly relates to an absorption refrigerator suitable for removing dissolved harmful ions.

[Conventional technology]

Aqueous solutions of alkali metal halides are highly corrosive, and in absorption refrigerators that use them as absorption liquids, the heat exchanger tubes made of steel or copper alloy layers corrode and elute copper ions. Conventionally,
Utility Model No. 61-15 Utilizing the pump transfer liquid as a flushing liquid for cooling and lubricating sliding parts such as pump bearings
There are Japanese Utility Model Application No. 1085 and Japanese Utility Model Application No. 176497/1985. In these systems, flushing liquid is introduced by the rotation of a pumping ring, the differential pressure between discharge pressure and suction pressure, etc., and a strainer is used to remove solids.

[Problem to be solved by the invention]

Although some of the above conventional technologies are equipped with filters to remove solids during pump cooling and lubrication, they do not take dissolved ions into consideration, and dissolved ions such as copper ions are harmful components that can corrode metal parts or cause damage. There were problems such as locking accidents due to precipitation of metal steel on sliding parts.

An object of the present invention is to provide an absorption refrigerator in which harmful ions present in an absorption liquid used as a flushing liquid used for pump cooling and lubrication are removed or reduced.

[Means to solve problems]

The above object is achieved by trapping harmful ions dissolved in the absorbing liquid, which is a flushing liquid used for cooling and lubricating the pump, with an adsorbent or ion exchange material, and removing or reducing them from the absorbing liquid.

[Effect]

Toxic ions such as copper ions dissolved into the absorption liquid or refrigerant due to corrosion of equipment component materials are removed by passing the solution through a cartridge-type purifier filled with adsorbent and/or cation exchange material as a purifying material. Alternatively, the concentration can be reduced and corrosion accidents or pump lock accidents due to copper deposition can be prevented.

Examples of the purifying material to be filled include activated carbon, adsorbents such as zeolite, and cation exchange resins.

These purifying materials are preferably in the form of granules.

Next, as for how to install a purifier, in the case of a refrigerator, a bypass pipe is provided in the piping system and the purifier is installed in this bypass pipe. This makes it easy to replace the purifier without stopping the machine. Further, in the case of a pump that uses the pumping liquid as flushing liquid, the pump is installed in a pipe that introduces the flushing liquid from the discharge side of the pump. The particle size of the purification material was set to about 4 to 12 in consideration of purification efficiency and flow resistance (head loss).

Next, we will examine the effect of the copper ion concentration in the absorption liquid on the amount of corrosion of 5S41 steel material in a 65% lithium bromide solution, which is an absorption liquid containing additives used in absorption refrigerators. and 160℃, 200℃ as shown in Figure 1.
From the time test results, it is clear that an increase in the copper ion concentration increases the amount of corrosion, but if the copper ion concentration is set to 110 PP or less, it has practically no effect on the amount of corrosion. Further, since the amount of precipitation of metallic steel corresponds to the amount of corrosion of steel, locking accidents of the pump due to precipitation of metallic steel can be prevented or operated for a long time by suppressing the steel ion concentration to 110 PP or less.

Next, looking at an example of the analysis results of the concentration of steel ions dissolved in the absorption liquid of a 300RT absorption chiller, the elution amount is approximately 1000pp+a over 2 months (500 hours of 10 hours/day operation), which is 20PP! The average elution amount is +/day. For example, looking at the purification efficiency of zeolite with an apparent specific gravity of 0.5° and an amount of 200 mu, Figure 2 shows that approximately 50% of the copper ions dissolved in the absorption liquid are removed by passing a 52pP cup of copper-containing ion absorption liquid once. From the experimental results shown, even if the steel ion elution concentration is assumed to be 50 ppm/day, it is possible to suppress it to IQppm or less.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Figure 3 is a steam generator model. It consists of a lower evaporator 1 and an upper condenser 2, and a solution 5 in the evaporator 1 is circulated and stirred from below the evaporator 1 by piping 3 and a pump 4.

Condensed water 6 that has been water-cooled and condensed in the condenser 2 is introduced into a pipe 7 and sucked into the pipe 3. Solution 5 is a 60% lithium bromide absorption liquid containing 1.0% wt of oxidized steel and some other additives.

The inside of the can is initially in a reduced pressure state of I x 10-"ma + Hg, and the solution 5 is sealed in the evaporator 1, and the can body is an airtight container. The cartridge type purifier 8 is equipped with a purifying material 9.
It is filled with zeolite and installed in the bypass pipe 10 provided in the pipe 3, and the flow rate is 1 m by the valve 9 provided in the pipe 3, the valve 11 provided before and after the purifier 8 of the bypass pipe 10, and the valve lla. /s.

As for the constituent materials, the can body is made of carbon steel, the heat exchange tube 12 of the condenser 2 is a pure copper tube, and the heat exchange tube 13 of the evaporator 1 is a boiler steel tube. The other pipes 3, 7 and 10 were all made of steel pipes. In the test, the solution temperature was heated to 100° C. with pressurized steam, and the absorbed liquid was collected from the valve 14 immediately before the condensed water 6 was sucked into the pipe 3, and the change in copper ion concentration over time was investigated. The results are shown in FIG. Initially, the steel ion concentration increases with the passage of time, but after 2 hours after passing through the purifier, the copper ion concentration rapidly decreases to less than 10Pp11 in about 30 minutes, and thereafter remains below loppm.

The size of the cartridge purifier 8 varies depending on the throughput, but the shape is a cylindrical tube 15 as shown in FIG.
A cleaning material 9 is filled in the inside, and ropes 17 and 1 of the same shape are attached to both ends.
M16 and 16a with 7a are connected to the bypass pipe 10 by union parts 18 and 18a.

〔Effect of the invention〕

According to the present invention, accidents such as locking of the pump of an absorption refrigerating machine and leakage of outside air due to corrosion of other equipment are prevented, and the reliability of the absorption refrigerating machine is greatly improved.

[Brief explanation of the drawing]

Figure 1 shows the relationship between the amount of corrosion of carbon steel in a lithium bromide solution and the dissolved copper ion concentration, and Figure 2 shows the removal effect of the purifier of the present invention on copper ions dissolved in the absorption liquid. Figure 93 is a system diagram of an example of purifying an absorption liquid using an evaporator model, Figure 4 is a diagram showing the effect of purifying an absorption liquid using an evaporator model, and Figure 5 is a sectional view of a cartridge type purifier.

Claims (1)

[Claims] 1. An absorption refrigerator that uses an aqueous solution of an alkali metal halide as an absorption liquid, and is characterized in that a purification mechanism is installed in the absorption liquid and refrigerant system piping.