JPH0417314B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a heat pump type gasification and dehumidification method that achieves significant energy savings in the production process of CnHn+α liquids such as LPG, LNG, etc. .

(Conventional technology) Conventionally, in gasification equipment for CnHn+α liquid, the amount of heat required for gasification is generated by heat exchange between hot water or steam heated by a boiler and CnHn+α liquid, and at the same time gasification is performed by mixing air. Although it has been supplied as a gas, this method heats it by simply burning fuel in a boiler, so improvements have been desired from the perspective of energy conservation. Furthermore, when manufacturing gas is pumped using conventional methods, moisture in the air mixed in with the manufacturing gas condenses, causing corrosion and freezing of pipes, etc., lowering the efficiency of terminal combustion of fuel gas and hindering stable supply. . For this reason, it is considered necessary to dehumidify the produced gas, but devices for the sole purpose of dehumidification are provided separately and are relatively expensive, which has hindered their widespread use.

(Problems to be Solved by the Invention) The present invention solves the problems of the prior art, and achieves significant improvement in operating efficiency and energy savings compared to the conventional CnHn+α liquid gasification method, It is an object of the present invention to provide a method for easily introducing a dehumidifying function, which has been delayed in its introduction even though its necessity has been recognized in the past.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides CnHn+α liquids such as LPG and LNG.
A heat pump that uses the cooling and dehumidifying heat obtained when producing gas from etc. as a heat source is operated, and the heat generated from the condenser of this heat pump is used.
A heat pump type that vaporizes CnHn+α liquid.
This article relates to a method for gasifying and dehumidifying CnHn+α liquid.

In addition, the present invention operates a heat pump that uses the cooling and dehumidifying heat obtained when producing the production gas as a heat source, and vaporizes the CnHn+α liquid using the heat generated from the condenser of the heat pump.
A heat pump type CnHn+α in which an air heat exchanger is provided in a heat pump cycle, and the air heat exchanger can be operated for absorbing heat from the cycle or dissipating heat from the cycle according to fluctuations in the heat load of the cycle. This invention relates to a liquid gasification and dehumidification method.

Furthermore, the present invention vaporizes the CnHn+α liquid by using the heat generated from the condensation heat of the heat pump, which uses the cooling and dehumidifying heat obtained when producing the production gas as a heat source. In this case, a heat pump type that can compensate for the lack of heat with a hot water boiler is installed.
This article relates to a method for gasifying and dehumidifying CnHn+α liquid.

(Function) According to the present invention, the heat pump is operated using the cooling and dehumidifying heat obtained when producing the production gas as a heat source, and the CnHn+α liquid can be vaporized using the heat generated from the condenser of the heat pump. Energy saving can be achieved along with the dehumidification function.

In addition, an air heat exchanger is provided in the heat pump cycle, and the air heat exchanger is operated for heat absorption or heat radiation for the cycle as the heat load of this cycle changes, thereby achieving stable operation of the heat pump. can be done.

Furthermore, if the heat generated by the heat pump cycle is temporarily insufficient, the hot water boiler can compensate for the insufficient heat, thereby allowing stable operation of the heat pump.

Furthermore, by driving the heat pump with a gas engine fueled by the produced gas, operating costs can be saved.

(Example) An example (first example) of the present invention will be described with reference to FIG. The refrigerant compressed by the compressor 5 is cooled and liquefied by applying heat for gasification to hot water flowing through the water heater in a water heater 7 serving as a condenser. The liquefied refrigerant passes through the expansion valve 18a, is depressurized, evaporates in the water cooler 10 (evaporator), cools the cold water flowing in the water cooler 10, and absorbs the cooling and dehumidifying heat obtained when manufacturing gas is produced. The air is sucked into the compressor 5 again through the . Heat pump cycle A is thus formed. The compressor 5 is driven by a gas engine 6. This can optionally also be done by a motor. The gas engine 6 uses manufactured gas as fuel,
This is supplied via a gas cutoff valve 16, while combustion air is supplied via an air cooler 14 and an air filter 15. In order to transfer the thermal heat for gasification to the paperizer 1, a medium different from the refrigerant of the heat pump, such as water, is introduced by the pump 21 into the water heater 7, where it absorbs heat. A circulation path 23 is formed in which the heat is further absorbed in the vessel 9 and is returned to the vaporizer 1.

The liquefied CnHn+α liquid gas is introduced into the vaporizer 1 through the introduction pipe 25, heated, and gasified. The gasified gas is ejected to the ventilator mixer 3 via the pressure reducing valve 2, and the intake air introduced through the introduction pipe 28 and dehumidified by the dehumidifier 13 is sucked in, where a mixture of gas and air is formed. . The mixture then enters the water-containing holder 4, flows through the conduit 26, passes through the dehumidifier 12, is further cooled and dehumidified as required, and flows out from the outlet pipe 27 as a production gas.

The dehumidifiers 12, 13 are connected to the water cooler 10 by circuits 29, 30 through which a medium different from the refrigerant of the heat pump cycle A, for example water or ethylene glycol brine, flows. 22 is a cold water pump. The cold heat generated by the heat pump cycle A cools the water flowing in the circulation paths 29 and 30 in the water cooler 10, and this cold water cools the intake air in the dehumidifier 13, and also cools the air-fuel mixture in the dehumidifier 12. It condenses moisture and acts as a dehumidifier.
The condensed water is removed by a separator or the like, and a dried product gas is obtained.

The above is an example of an apparatus for carrying out the present invention. In order to correct an imbalance in the heat balance of each part of the apparatus or a time difference in the operation of each part (for example, a time difference between manufacturing time and supply time), etc. Furthermore, the following means are provided.

First, when the heat generated by the heat pump cycle A is temporarily insufficient, a hot water boiler 24 is provided in the circulation path 23 in order to compensate for the insufficient heat. In addition, if sufficient heat cannot be obtained for gasification only from the dehumidifying cooling by the water cooler 10, the inlet side of the expansion valve 18a of the heat pump cycle A and the compressor 5
The expansion valve 18b, the air heat exchanger 1
1. A part of the refrigerant is made to flow through the circuit 32 having the control valve 17b, so that the air heat exchanger 11 absorbs the heat of evaporation from the outside air. In addition, if the water heater 7 generates more heat than necessary, a part of the gas refrigerant discharged from the compressor 5 is transferred to the side passage 33.
34, the gas refrigerant is caused to flow into the air heat exchanger 11 via the control valve 17c, where it is cooled and condensed to radiate heat, and then the refrigerant liquid is caused to flow into the water heater 7 via the side passage 35 and the check valve 19. Make it. In this way, the amount of heat given to a medium such as water in the water heater 7 is reduced.

Reference numerals 37a and 38a indicate a cold water outlet and an inlet provided in the water circulation path 29, and a cold water inlet 37b and an outlet of the air cooler 14 for cooling and dehumidifying the air taken into the gas engine 6. 38b, respectively. Note that 39 and 40 are pipe lines connected to other heat sources.

Further, in the embodiment, the cold heat in the water cooler 10 is conveyed to the dehumidifiers 12 and 13 using the water flowing through the circulation paths 29 and 30 as a medium, but the dehumidifiers 12 and 13 are not provided, and the intake air is directly supplied from the introduction pipe 28. Alternatively, the water may be introduced into the water cooler 10 to be cooled and dehumidified, and then flowed into the ventilary mixer 3.

Next, another embodiment (second embodiment) of the present invention will be described with reference to FIG. In this embodiment, in order to directly transfer the heat generated from the water heater 7 (condenser) to the CnHn + The liquefied gas is different from the first embodiment in that it is heated by directly flowing into the water heater 7 through the ventilary mixer 3 after being further heated in the jacket heat exchanger 8 and the exhaust gas heat exchanger 9. The only difference from the first embodiment is that the hot water boiler 24 provided in the inflow path further heats the water as required, and the other configurations are the same as the first embodiment. In other words, the structure and operation of the components denoted by the same reference numerals as in the first embodiment are the same as those in the first embodiment.

〔Effect of the invention〕

According to the present invention, energy savings of 100% in summer and 70% in winter can be achieved compared to conventional gasifiers alone, and it is also possible to have a dehumidifying function. This dehumidification function prevents the condensation of water from the produced gas during pumping, which was a problem in the past, and also eliminates the need to regularly remove condensed water, and eliminates the occurrence of bad odors during this removal process. solved the problem.

In addition, the cost of installing equipment for carrying out the method of the present invention can be reduced by integrating two conventional functions, gasification and dehumidification, into one system via a heat pump cycle, thereby avoiding duplication of the parts required for the two functions. This made it relatively inexpensive.

In addition, by using a gas engine as the driving source and using self-produced fuel, operating costs can be reduced, and installation is easier by keeping the supply of external power to a small amount. Ta.

[Brief explanation of drawings]

FIG. 1 is a flow sheet diagram of a first embodiment implementing the method of the present invention, and FIG. 2 is a flow sheet diagram of a second embodiment. 1...Paperizer, 5...Compressor, 6...Gas engine, 7...Water heater as condenser, 10
...Water cooler as an evaporator using cooling and dehumidifying heat as a heat source, 11...Air heat exchanger, 14...Air cooler, 23...Circulation path using a medium different from the refrigerant of the heat pump, 24...Hot water boiler, A... …heat pump cycle.

Claims (1)

[Scope of Claims] 1. A heat pump-type CnHn+α liquid gas characterized in that the CnHn+α liquid is vaporized using heat generated from a condenser of a heat pump whose heat source is cooling and dehumidifying heat obtained when producing a manufactured gas. dehumidification method. 2. A heat pump type CnHn+α liquid gasification and dehumidification method according to claim 1, characterized in that heat generated from a condenser is directly transferred to the CnHn+α liquid. 3. A heat pump type CnHn+α liquid gasification and dehumidification method according to claim 1, characterized in that the heat generated from the condenser is transferred to the CnHn+α liquid via a medium different from the refrigerant of the heat pump. 4. The CnHn+α liquid is vaporized using the heat generated from the condenser of the heat pump, which uses the cooling and dehumidifying heat obtained when producing the manufactured gas as a heat source, and an air heat exchanger is installed in the heat pump cycle to reduce the heat load of the cycle. A heat pump type CnHn+α liquid gasification and dehumidification method, characterized in that the air heat exchanger is operated to absorb heat from the cycle or to radiate heat from the cycle depending on fluctuations. 5 If the heat generated from the condenser of a heat pump that uses cooling and dehumidifying heat as a heat source is insufficient to vaporize the CnHn+α liquid, a part of the condensed refrigerant of the heat pump is evaporated with an air heat exchanger to absorb heat. , If the generated heat from the condenser leaves over the heat for vaporizing the CnHn+α liquid, a part of the compressed and discharged refrigerant gas is cooled and liquefied in an air heat exchanger to radiate the heat. 4. A heat pump type CnHn+α liquid gasification and dehumidification method as described in item 4. 6 The CnHn+α liquid is vaporized by using the heat generated from the condensation heat of the heat pump, which uses the cooling and dehumidifying heat obtained when producing the manufactured gas as a heat source, and if the heat generated by the heat pump cycle is temporarily insufficient, the hot water boiler is used. A heat pump type CnHn+α liquid gasification and dehumidification method characterized by supplementing the insufficient heat by. 7. Vaporizing the CnHn+α liquid using the heat generated from the condenser of the heat pump, which uses the cooling and dehumidifying heat obtained when producing the produced gas as a heat source, and driving the heat pump with a gas engine that uses the produced gas as fuel. A heat pump type CnHn+α liquid gasification and dehumidification method characterized by: