JPS5831262A - Preventive device for crystallization of absorbing liquid of absorption heat pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to prevention of crystallization of an absorption liquid in an absorption heat pump in which the absorption temperature is higher than the generation temperature and the evaporation temperature of the refrigerant is set higher than the condensation temperature.

Generally, a refrigerator has a cooling side and a heat radiation side, and when the cooling side is used, it is called a refrigerator, and when the heat radiation side is used, it is called a heat pump, and most absorption heat pumps fall under this concept.

However, the absorption heat pump of the present invention is an absorber dedicated to heat pumps that differs from the above concept. A heat pump that takes high-temperature hot water downstream by the absorption heat generated, and an absorption liquid in a type of absorption heat pump where the absorption temperature is higher than the generation temperature, and the evaporation temperature of the refrigerant is higher than the condensation temperature. This relates to a crystallization prevention device.

The figure shows an example of such an absorption heat pump.
) contains an evaporator (21g), an absorber (31g), a generator +51g and a condenser +61 (41g), respectively, and these vessels include a refrigerant pipe (81g) with a refrigerant pump (7) and an absorber (31g).
, absorption liquid pump (91), absorption liquid pipe 0α, absorption liquid return pipe 1111, airtightly connected via heat exchanger 02, etc., evaporator +21 +: liquid refrigerant reservoir 0 (and liquid refrigerant refrigerant circulation pump o41 that sprays from the top of the evaporator (2)
The generator +51 and the evaporator (2) are each supplied with a low-temperature heat source fluid (referred to as a low-temperature heat source) such as heated waste water, and are heat exchangers that supply heat to the absorption heat pump system. n5In61, the condenser 16) has a generator (
It became a party in 51. T7 & 7a: 'A cooler that cools and liquefies (171 is built in).The hot water heat exchanger of the CS absorber (Xl) from 0 seconds to the hot water heater can be removed so that the heating tank can be removed ( There are two.

For example, when using lithium bromide as the absorption liquid, water as the refrigerant, wastewater at 60°C as the low-temperature heat source, and water at 15°C as the cooling water, approximately 80 °
C hot water is obtained from the hot water heat exchanger.

However, since the absorber side of such an absorption heat pump is sometimes operated in a high concentration state close to the crystal line, when stopping the heat pump operation, it is necessary not only to stop it under normal operation control. Even in the event of a power outage or failure of the absorption liquid pump, it is necessary to ensure that the absorption liquid is diluted when the operation is stopped.

The present invention, which was made in view of these points, is a crystallization prevention device that combines an absorption liquid dilution mechanism that fully utilizes a refrigerant circulation pump and an absorption liquid dilution mechanism that utilizes the dexterous pressure difference χ of an absorption heat pump. , as shown in Fig. 1, the discharge port 09 of the refrigerant circulation pump and the absorber (31 is the solenoid valve (4)
At the same time, the refrigerant reservoir (1'3) of the evaporator and the generator +51 are connected by the refrigerant pipe (211) with a It is connected by a refrigerant pipe fence equipped with a reverse siphon pipe 1221 or a solenoid valve C2317 that closes when energized and opens when de-energized.

In other words, when the absorption heat pump is under normal operating conditions,
C opens the electromagnetic valve 0411 prior to stopping the heat pump operation and operates the refrigerant circulation pump 0411 for a certain period of time so that the refrigerant liquid in the refrigerant reservoir 0 (to) flows down to the absorber (3). Pump (7) continues to run and condenser (6)
When the refrigerant liquid flows into the evaporator (2), the refrigerant pump (
7) When the refrigerant liquid in the refrigerant reservoir G''3 is mixed with the absorption liquid on the absorber +31 side and the refrigerant liquid disappears, the refrigerant circulation pump 04 is completely stopped, and after a certain period of time, the refrigerant liquid is absorbed. The absorption liquid pump (8) is set to stop when liquid C2 is mixed in.

When the C refrigerant circulation pump 041 cannot be operated due to power outage or failure, the refrigerant pipe valve CJ31 is opened, and the total pressure difference of the refrigerant liquid in the refrigerant reservoir 034 is applied to the generator (51) to dilute the absorption liquid. In this case, a reverse siphon tube is attached to the evaporator (2), and the pressure rise on the evaporator (2) side that occurs when the refrigerant pump etc. stops causes the reverse siphon tube to become The C generator (5) is filled with refrigerant liquid.
), the refrigerant can be mixed into the absorption liquid without the need for a solenoid valve (c).

In addition, when a manual valve or a solenoid valve WQ that opens and descends when not energized is attached to the refrigerant pipe r24I, connect the lower end of the refrigerant pipe
The refrigerant liquid may flow into the generator f51 through the absorption liquid pipe 01'&.

In this way, in the present invention, the refrigerant pump outlet and the absorber are connected to each other by the refrigerant pipe with the solenoid valve that opens before the operation of the refrigerant pump, the absorber, and all heat pumps is stopped. The refrigerant and generator are connected by a refrigerant pipe so that the refrigerant liquid in the -C refrigerant reservoir flows to the generator, which has a pressure difference in the equipment that occurs when the refrigerant pump is stopped, so the absorption temperature is higher than the generation temperature and the refrigerant Since the evaporation temperature is set higher than the condensation temperature, the absorption liquid temperature is high and absorption liquid crystals are likely to form. be.

[Brief explanation of drawings]

Claims (1)

[Claims] +l+ Heat source fluid is supplied to the evaporator and generator while circulating cooling water to the condenser, and hot water at a temperature higher than the temperature of the heat source fluid is taken out from the absorber, such as the generator, condenser, evaporator, absorber, etc. The C1 evaporator is equipped with a refrigerant reservoir for storing unvaporized refrigerant and a circulation pump for liquid refrigerant, and the outlet of the pump and the absorption The refrigerant pipe is equipped with a solenoid valve that is opened to 0M before the absorption heat pump stops operating.
At the same time, the refrigerant liquid reservoir of the evaporator and the generator are connected to the refrigerant liquid Z generator of the refrigerant reservoir by a refrigerant pipe having a flow mechanism due to the pressure difference between the evaporator and the generator that occurs when the refrigerant pump is stopped. A unique feature of absorption liquid crystal prevention device for absorption heat pumps.