JPH09133430A - Air conditioner using lng plant equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce air conditioning equipment and hence reduce the running cost by providing a refrigerant circulation line for supplying a refrigerant absorbing cold heat in a heat storage tank to an air cooling coil. SOLUTION: A heat storage tank 2 is provided on the inlet side of an evaporator 3, and a refrigerant circulating through a refrigerant circulation line 12 is cooled with low temperature LNG. The LNG is at low temperature of -162 deg.C, and a refrigerant for cooling air is cooled to about 15 deg.C and is heated with air to about 30 deg.C and is returned to the heat storage tank 2. The refrigerant circulation line 12 comprises a heat transfer pipe 11 for flowing therethrough a second refrigerant meandering in the heat storage tank 2 and being cooled with a first refrigerant 10, a cooling coil 13 for cooling air with the second refrigerant, a refrigerant circulation pump 14 for circulating the second refrigerant, and a bypass line 12a provided on the outlet side of the refrigerant circulation pump 14. Hereby, cooling and heating are performed by making use of energy produced in a production process in the LNG plant equipment, and hence the need of a freezer and a cooling tower required for the cooling and a heating boiler required for the heating is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using LNG plant equipment for cooling a refrigerant by LNG heat of vaporization for air conditioning.

[0002]

2. Description of the Related Art A large-scale air conditioner for air conditioning a building uses a cooling tower and a refrigerator for cooling and a heating boiler for heating.

[0003]

The cooling tower, the refrigerator, and the heating boiler as described above require facility costs and running costs. On the other hand, in LNG plant equipment, a large amount of cold heat is discarded when LNG is vaporized, and the turbine that generates power by LNG is equipped with a condenser that condenses steam, and the heat of steam can be used. Is.

The present invention has been made in view of the above problems, and an object thereof is to reduce the running cost by reducing the air conditioning equipment by utilizing the cold heat and steam generated in the LNG plant equipment.

[0005]

In order to achieve the above object, in the invention of claim 1, a heat storage tank provided on the inlet side of the LNG vaporizer for absorbing the cold heat of the LNG, and the cold heat of this heat storage tank are absorbed. And a refrigerant circulation line for supplying the refrigerant to the air cooling coil.

The cold heat of LNG entering the vaporizer is absorbed in the heat storage tank, absorbed by the refrigerant circulating in the refrigerant circulation line and supplied to the air cooling coil. The air is cooled by this air cooling coil and used as cooling air.

According to the second aspect of the present invention, a heat storage tank provided on the inlet side of the LNG vaporizer for absorbing the cold heat of the LNG, and a refrigerant circulation line for supplying the refrigerant absorbing the cold heat of the heat storage tank to the air cooling coil, A heat medium circulation line is provided on the inlet side of the condenser of the turbine that performs power generation by LNG, and supplies a heat medium that absorbs heat of steam entering the condenser to the air heating coil.

The cold heat of LNG entering the vaporizer is absorbed in the heat storage tank, which is absorbed by the refrigerant circulating in the refrigerant circulation line and supplied to the air cooling coil. The air is cooled by this air cooling coil and used as cooling air. Also, the heat of steam entering the condenser of the turbine is absorbed by the heat medium circulating in the heating circulation line and supplied to the air heating coil. The air is heated by this air heating coil to be heating air. Thereby, air for heating and cooling can be obtained.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an example of the layout of an LNG power plant using the air conditioning system of the embodiment. FIG. 2 shows an air conditioning system diagram of the embodiment. In FIG. 1, an LNG tank 1 stores LNG (liquefied natural gas) for power generation. When LNG at −162 ° C. absorbs heat from the surroundings when vaporized, this heat absorption capacity is called cold heat, and the heat storage tank 2 absorbs this cold heat and the refrigerant circulation line 1 shown in FIG.
Supply to the second refrigerant. The vaporizer 3 supplies heat of vaporization by seawater to LNG partially vaporized by the heat storage tank 2 to turn it into a gaseous NG. In the case of this power plant, four boilers are provided and a turbine generator is provided for each of the boilers, which are installed in the boiler building 4 and the turbine building 5, respectively. A control building 6 is provided for each of two adjacent boiler buildings 4 and a turbine building 5 corresponding to the boiler building 4, and devices for controlling the boiler, the turbine and the like are arranged. The vaporized NG is burned in the boiler to generate steam, and drives a generator directly connected to the turbine to generate electric power. The air conditioning system according to the present embodiment is used in the control building 6 and the like, keeps the computer room at a constant temperature, and heats the control room and the like. The generated electricity is boosted to a high voltage in the substation 7 and transmitted. LNG carrier 8 is moored on the pier
G is supplied to the LNG tank 1.

In FIG. 2, the heat storage tank 2 is provided on the inlet side of the vaporizer 3 and cools the refrigerant circulating in the refrigerant circulation line 12 by low temperature LNG. LNG has a low temperature of -162 [deg.] C., and the refrigerant that cools the air is cooled to about 15 [deg.] C. and is heated by the air to about 30 [deg.] C. and returns to the heat storage tank 2. For this reason, if the refrigerant that directly cools the air is cooled by LNG, the temperature difference is large, and the heat transfer tube 11 through which this refrigerant passes may be damaged, so liquefied propane (-4
(2 degreeC) or the 1st refrigerant | coolant 10 which consists of liquefied ethylene (-82 degreeC) is put in, the 1st refrigerant | coolant 10 is cooled by LNG, and the 2nd refrigerant | coolant of the refrigerant | coolant circulation line 12 is cooled by this 1st refrigerant | coolant 10. The refrigerant circulation line 12 meanders in the heat storage tank 2 and allows the second refrigerant cooled by the first refrigerant 10 to pass therethrough.
1 and a cooling coil 13 for cooling air with a second refrigerant
A refrigerant circulation pump 14 for circulating the second refrigerant, and a bypass line 12a provided on the outlet side of the refrigerant circulation pump 14, and bypass valves 12b, 12c.

Provided on the inlet side of the condenser 16 of the turbine,
A heat exchanger 17 is provided for passing the steam flowing into the condenser 16 to the barrel side and passing the heat medium to the heat transfer tube, and the heat medium is heated by the steam. The heat medium circulation line 15 sends the heated heat medium to the heating coil 18, where the air-cooled heat medium is circulated back to the heat exchanger 17 by the heat medium circulation pump 19. In the cooling and heating air circulation line 20, the air circulation blower 2
1 blows air to the cooling coil 13 or the heating coil 18, blows cooled or heated air to the blowout suction unit 22 provided in each room of the control building 6, and returns the sucked air to the air circulation blower 21 for circulation. . Cooling coil 1
3, the heating coil 18 and the air circulation blower 21 constitute an air conditioning unit 23. A fresh air supply line 24 is connected to the inlet side of the air circulation blower 21 to supply fresh air.

Next, the operation will be described. In the summer, the bypass valve 12b is closed, the bypass valve 12c is opened, the second refrigerant is passed through the cooling coil 13, the heat medium circulation pump 19 is stopped, the air circulation blower 21 is operated, and cold air is blown out from the blowout suction unit 22 for cooling. I do. When the humidity is high, dehumidification can be performed by cooling the air blown by the cooling coil 13 even if it is not hot. When not performing cooling or dehumidification, open the bypass valve 12b, 1
2c is closed and the second refrigerant circulates in the bypass line 12a. In this way, even when the cooling coil 13 is not used, the second refrigerant in the heat transfer tube 11 is circulated to prevent freezing. In the winter, the heat medium circulation pump 19 is operated and the heating coil 18
Is heated to operate the air circulation blower 21, and hot air is blown from the blow-off suction unit 22 to perform heating.

In the above description, the control building 6 is targeted for cooling and heating.
However, it is possible to perform heating and cooling in other buildings as well. Although the air conditioning unit 23 has been described as one, a plurality of air conditioning units 23 can be provided to cool and heat a wide area.

[0014]

As is apparent from the above description, the present invention uses the energy generated in the production process in LNG plant equipment to perform cooling and heating, thereby eliminating the need for a refrigerator and a cooling tower required for cooling. Moreover, it is possible to eliminate the need for a heating boiler or the like required for heating, and to eliminate the running costs of these.

[Brief description of the drawings]

FIG. 1 is a diagram showing an arrangement example of an LNG power plant provided with an air conditioning system of an embodiment.

FIG. 2 is a diagram showing an air conditioning system according to an embodiment.

[Explanation of symbols]

 1 LNG Tank 2 Heat Storage Tank 3 Vaporizer 4 Boiler Building 5 Turbine Building 6 Control Building 10 First Refrigerant 11 Heat Transfer Tube 12 Refrigerant Circulation Line 12a Bypass Line 12b, 12c Bypass Valve 13 Cooling Coil 14 Refrigerant Circulation Pump 15 Heat Medium Circulation Line 16 Condenser 17 Heat exchanger 18 Heating coil 19 Heat medium circulation pump 20 Cooling and heating air circulation line 21 Air circulation blower 22 Blow-off suction unit 23 Air conditioning unit 24 Fresh air supply line

Claims (2)

[Claims] 1. A heat storage tank provided on the inlet side of an LNG vaporizer for absorbing the cold heat of LNG, and a refrigerant circulation line for supplying a refrigerant absorbing the cold heat of the heat storage tank to an air cooling coil. An air conditioner that uses the LNG plant equipment. 2. A heat storage tank provided on the inlet side of the LNG vaporizer for absorbing the cold heat of the LNG; a refrigerant circulation line for supplying a refrigerant absorbing the cold heat of the heat storage tank to an air cooling coil;
A LNG, which is provided on the inlet side of a condenser of a turbine that performs power generation by NG, and is provided with a heat medium circulation line that supplies a heat medium that absorbs heat of steam entering the condenser to an air heating coil. An air conditioner that uses plant equipment.