JPS5958105A - Power generating method utilizing hot water heat - Google Patents

Abstract

PURPOSE:To generate power by means of ammonia gas which is obtained by compressing low temperature and low pressure ammine complex salt solution and heating it by hot water to be dissociated therefrom. CONSTITUTION:Low temperature and low pressure ammine complex salt solution in an ammine complex salt solution take 5 is sent into a dissociating and heat absorbing tower, wherein after hot water heats the ammine complex salt solution, the hot water itself is cooled and discharged. Cool water serving as a cooling and heating source is fed into a gas absorbing and heating tower 8, and absorbs the heat which is radiated by absorbing the ammonia gas to coordinate with the ammine complex salt solution, to cool said solution and then discharged. When the ammine complex salt solution which is heated in the gas dissociating and heating tower reaches the dissolution equilibrium temperature corresponding to the pressure of said solution, at least a part of ammonia is dissociated from it. The resulting ammonia gas is carried from the dissociating and heat absorbing tower to be temporarily accumulated in an ammonia gas tank 8, sent into the ammonia gas turbine 9 and expanded to drive it so that the pressure of the gas is reduced. The ammonia gas is thereafter fed into the bottom part of the gas absorbing and heating tower 8, heated by the ammine complex salt solution and then delivered into said tower 8 from its top part.

Description

[Detailed description of the invention] The present invention relates to a power generation system using hot water heat.

In recent years, the effective use of waste heat has been widely studied from the perspective of energy conservation, but if the temperature of waste heat is below 150°C, it is considered impractical from the point of view of C1 economics to use it for power generation. It had been.

The present invention has been made in view of the above, and an object of the present invention is to provide an economical power generation method using waste heat at a temperature as low as several tens of degrees.

The present invention is a hot water thermal power generation system that uses as a working fluid an ammine complex salt liquid that absorbs heat when dissociating ammonia gas and radiates heat when absorbing and coordinating ammonia gas. The ammine complex salt dissociates into an endothermic group, is heated with hot water at a predetermined temperature to dissociate at least a portion of the ammonia gas, and this ammonia gas is sent to a power generation turbine to generate electricity, and the ammine complex salt liquid from which the ammonia gas has been dissociated is absorbed into gas. The ammine complex is introduced into an exothermic group, brought into contact with ammonia gas from the gas turbine, and cooled by a cold heat source at a predetermined temperature, thereby causing the ammine complex salt to absorb and coordinate the ammonia gas.

The present invention will be described below based on drawings showing examples.

As shown in FIG. 1, hot water 1 as a heat source is guided by a pump 2 to a heat exchanger tube 4 in a gas dissociation endothermic tower. The complex salt solution is pumped to a pressure pb by the pump 6, and thus 1. After the hot water heats the ammine complex salt solution, it is cooled and released. In addition, cold water as a cold heat source is led to a gas absorption exothermic tower 8 through a pipe 7, and as described later, heat dissipated by absorption and coordination of ammonia gas in the ammine complex salt liquid is absorbed and the ammine complex salt liquid is cooled. After that, it is discharged. As the ammine complex salt, for example, Nal·n N H3 is suitable.

The ammine complex salt liquid heated in the gas dissociation exothermic tower is
When the decomposition equilibrium temperature corresponding to the pressure it has is reached, at least a portion of the ammonia is dissociated. This ammonia gas is partially accumulated in the ammonia gas tank 8 from the dissociation endothermic tower, and then sent to the ammonia gas turbine 9, expanded and driven, and its pressure is Pa.
decreases to Since this expansion is adiabatic expansion, the temperature of ammonia and agas leaving the gas turbine is uniquely determined by the principle of constant minicitropy. This ammonia gas is then sent to the bottom of the gas absorption exothermic tower 8 through a pipe 10, heated to form an ammine complex salt solution, and then fed into the gas absorption exothermic tower from the top of the tower.

On the other hand, the ammine complex salt liquid, in which ammonia gas has been partially dissociated, passes through the pipe 11, is depressurized by the expansion valve 12 as necessary, and then is supplied into the tower from the top of the tower, and is thus sent to the gas absorption exothermic tower. It absorbs and coordinates ammonia gas from the gas turbine.

The amount of heat released at this time is absorbed by separately guiding a cold heat source at a predetermined temperature to the gas absorption/exothermic tower, but it may also be absorbed by cooled hot water from the gas dissociation/exothermic tower.

The ammine complex salt liquid that has absorbed and coordinated ammonia gas and has reached a predetermined temperature and pressure is then returned to the ammine complex salt liquid tank 5 through the pipe line 13, thus completing the cycle. In addition, when the cooling in the gas absorption exothermic tower is performed using the cooled hot water from the gas dissociation and exothermic tower, the insufficient cooling amount is cooled by another cold heat source. Although this is not shown, a heat exchanger that introduces a cold heat source at a predetermined temperature is installed between the gas absorption exothermic tower and the ammine complex salt liquid tank, and the ammine complex salt liquid from the gas absorption exothermic tower is transferred to this heat exchanger. The ammine complex salt liquid tank is then returned to the ammine complex salt liquid tank at a predetermined temperature by heat exchange.

Next, for the power generation method explained above, the horizontal axis is the reciprocal of the absolute temperature,
The explanation will be based on FIG. 2, which shows a characteristic diagram of ammine complex salt with the vertical axis representing pressure. The initial state of the ammine complex salt solution, ie, the state in the tank, corresponds to point A, and the pressure is pb. It is pressurized by a pump and heated in a dissociation absorption tower, reaching a pressure Pa and reaching point B without dissociating ammonia gas. Further, when heated, ammonia gas is partially dissociated while keeping the pressure constant, and a point C is reached. The ammine complex salt that has dissociated the ammonia gas lowers its pressure to PB through an expansion valve, and becomes cold due to heat exchange with a cold heat source, etc., and reaches a point where it absorbs and distributes ammonia gas at the same temperature again. and return to point A, thus completing the cycle.

FIG. 1 lists some specific specifications of temperature and pressure in the power generation system of the present invention. However, these values are for reference only.

As described above, according to the power generation method of the present invention, it is possible to generate power using a heat source at a low temperature of about several tens of degrees, and the cycle is also simple.

[Brief explanation of drawings]

FIG. 1 is an apparatus configuration diagram showing an embodiment of the power generation method according to the present invention, and FIG. 2 is a characteristic diagram showing the cycle of ammine complex salt in the power generation method of the present invention. DESCRIPTION OF SYMBOLS 1... Hot water, 3... Gas dissociation endothermic tower, 5... Ammine complex salt liquid tank, 8... Gas absorption exothermic tower, 9...
Ammonia gas turbine, 12... expansion valve. (Volunteer to write procedural amendments) ■, Indication of the case Patent Application No. 167397, filed in 1982, 2, Name of the invention Hot water thermal power generation system 3, Person making the amendment Relationship to the case Patent applicant Address 1, Wakihama-cho, Chuo-ku, Kobe City Chome 3-18 Name
Kobe Steel, Ltd. 4, agent address: 1-8-3-5 Shinmachi, Nishi-ku, Osaka, date of amendment order] Showa year, month, day Contents of amendment (1) Page 3, line 6 of the specification r P b J-r
Correct it as P a.J. (21 clearll1l 1 ammonia gas tank 8 on page 3, line 19 of the book box is corrected to ``ammonia gas tank 14''. (3) rPaJ on page 4, line 1 of the specification is corrected to rPbJ. (4) Specification No. Delete "This is not shown, but...etc." in lines 3 to 8 on page 4. (5) Correct Figure 1 of the drawing to look like a separate iJE.

Claims (1)

[Claims] (1) In a hot water thermal power generation system that uses an ammine complex salt liquid as a working fluid, which absorbs heat when dissociating ammonia gas and radiates heat when absorbing and coordinating ammonia gas, the low temperature and low pressure ammine complex salt liquid is pressurized. The ammonia gas is guided to the complex salt dissociation endothermic group, heated with hot water at a predetermined temperature to dissociate at least a portion of the ammonia gas, and this ammonia gas is sent to a power generation turbine to generate electricity, and the ammine complex salt liquid in which the ammonia gas has been dissociated is gas-absorbed and heat-generated. A hot water thermal power generation system characterized in that the ammine complex salt is introduced into the ammine complex salt, brought into contact with ammonia gas from the gas turbine, and cooled by a cold heat source at a predetermined temperature, thereby absorbing and coordinating the ammonia gas into the ammine complex salt.