JPS6086302A - Method of generating steam - 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 a method of generating steam using a heat pump, and its purpose is to provide a method that can efficiently generate low-pressure steam.

9- The steam generation method according to the present invention heats manganese chloride monohydrate with a high-temperature heat source and dehydrates it by the heat of dehydration Q1 according to the reaction of the following formula, Mn Cl 2 ・+20
(solid) 101 → Mn Cl 2 (solid) + 820 (ki)
...(I) The generated water vapor is condensed according to the reaction of the following formula, and +20
(Gas) → H20 (Liquid) 102 ... (II) The obtained heat of condensation Q2 is used as a heat source for generating the desired low-pressure steam, and on the other hand, after the completion of the above dehydration reaction, the heat of evaporation Q2 obtained from the low-temperature heat source is used. Then, the condensed water produced in reaction formula (II) is evaporated according to the reaction of the following formula: Hydrate according to the reaction of the formula, MnCl2 (solid) + 820 (air) → Mn Cl
2.H20 (solid) 101 It is characterized in that the obtained heat of hydration Q1 is used as a heat source for generating desired low-pressure steam.

First, manganese chloride monohydrate (MnC12・+20)
This section explains the basic principle of a heat pump using a heat pump.

FIG. 1 shows the water vapor pressure curve of manganese chloride monohydrate and water vapor pressure curve measured by the present inventors.

First, MnCl2 +20 was heated to 242°C using a high-temperature heat source.
When heated to , this results in a dehydration reaction according to the reaction:

3- MnCl2・+20 (solid) 101 4MnCl2 (solid) +820 (air) ... (I) (Kokote, heat of dehydration Q1 is 17, 4 Kcal/Il
l.

It is 1. ) As a result of this dehydration reaction, the -water salt releases water vapor, and in an equilibrium state, this water vapor is shown by the arrow (a) (
b) shows the water vapor pressure of 10001H11. This water vapor pressure is indicated by arrows (b) (c) in the figure.
), it is equal to the saturated vapor pressure of water at 107°C, so when water vapor is cooled to a temperature lower than 107°C, it releases sensible heat and latent heat Q2 as heat of condensation and condenses according to the reaction of the following equation. It becomes water.

+20 (gas) → H20 (liquid) When water is heated using a good boiler, it becomes approximately 107
℃ to obtain low pressure steam of 1.36 kO/cm2.

On the other hand, after the dehydration reaction is completed, the reaction formula (I>
The anhydride of manganese chloride is reacted with steam according to the reverse reaction, that is, the reaction (IV) of the following formula, and the anhydride is hydrated according to the following formula.

MnJ12 (solid) + 820 (air) → Mn Cl 2 ・H20 (solid) + 01... (IV
) Now, suppose that the water vapor used in this reaction is obtained by boiling water at 15°C according to the following equation: As shown by the arrow (d) (8) in Figure 1, the water vapor pressure is 10
It is equal to the water vapor pressure of Mn C12.H2O at 7°C. If the heat of hydration Q1 generated by absorption of water vapor according to the above reaction formula (IV) is recovered as a heat source for water vapor generation by a boiler with extremely good heat transfer performance, as described above, 10
Low-pressure steam of 1,36 k (1/c+a2) boiling at 7°C is obtained.

In the above description, the reaction heat is expressed on the basis of 25° C. and 1 atm, and the temperature difference during heat transfer is O.

The heat balance based on the above basic principle is schematically shown in FIG.

Next, the present invention will be specifically explained with reference to Examples.

FIG. 3 shows an apparatus for generating low-pressure steam by the method of the present invention, using exhaust smoke as a high-temperature heat source and river water as a low-temperature heat source.

A reactor (1) for the hydration/dehydration reaction of manganese chloride communicates with a condenser (3) via a steam passageway (2) at the top;
The bottom of the condenser (3) communicates with the evaporator (4). A first boiler (5) is arranged in the condenser (3), a second boiler (6) is arranged in the reactor (1), and an evaporator (4) is arranged in the reactor (1).
) is provided with a heat transfer section (7).

The required amount of 1yln C12.H2O is contained in the reactor (1).
The jacket (9) of the reactor (1) is connected to a smoke exhaust line (10), and the heat transfer section (7) of the evaporator (4) is connected to a river water line. (11) is connected. And water-7 = steam water line (12) passes through the heat exchanger (13) through which the smoke exhaust line (10) passes, and its branch parts (12a) (12b
) are the first boiler (5) and the second boiler (
6).

When flue gas at a temperature of 350°C is passed through the smoke exhaust line (10), the flue gas heats the Mn(l□ ・H2O particle layer (8)) and transfers heat of dehydration to the same particle layer (8). 17. per mol.
4 Kcal is given, and the temperature is 250° C. and the heat exchanger (13) is reached. The heat transfer area of reactor (1) is MnCl□ ・H2O
The temperature of the particle layer (8) is 242℃ as a result of heating by exhaust smoke.
is designed to be. Therefore, the same particle layer (
As shown in FIG. 1, the steam generated by the heating and dehydration in step 8) has a steam pressure of 1000 ml and 100 O, and enters the condenser (3) through the steam passage (2). The valve (14) of the branch part (12-9- to 8-a) of the steam water line (12) is opened, and the valve (14) of the branch part (12b) is opened.
15) is closed, and the first boiler (5) is equipped with a heat exchanger (
Steam water preheated from 25°C to 104°C in step 13) is supplied in an amount of 1 mol per 21 mol of MnCl. Of course, the water for steam does not need to pass through the heat exchanger (13). Therefore, when the water vapor comes into contact with the first boiler (5) whose surface temperature is maintained at 107° C. or lower in the condenser (3), it condenses into water having a temperature equal to the surface temperature. First boiler (5) in condenser (3)
The first
Adjusting the valve (16) at the top of the boiler (5) causes the first
The water in the boiler (5) has a temperature of 1 due to the heat of condensation of water vapor.
It is boiled at 0.4°C to obtain low pressure steam. In this case, the amount of heat recovered by low-pressure steam is 21.0 Kcal per MnCl2.H10-20111101. The condensed water flows down from the condenser (3) to the evaporator (4) and accumulates there, while maintaining the temperature of 107°C.

After the dehydration reaction is completely completed, stop the flow of flue gas,
In addition, the valve (14) of the branch part (12a) is closed, and the branch part (12a) is closed.
12b) open the valve (15). As a result, the temperature of the particle bed (8) drops from 242°C to 107°C due to the supply of steam water to the second boiler (6). Steam is generated in the second boiler (6), and its internal pressure is 1.
Adjust the valve (17) at the top of the second boiler (6) so that 2ko/ci2. The amount of heat required to lower the temperature of the particle layer (8), that is, the sensible heat of the particle layer (8) and the evaporator (4)
The sum of the sensible heat of the condensed water accumulated inside is approximately equal to the heat of temperature rise required for the next dehydration reaction.

Now, the temperature of the particle layer (8) is 107°C, and the temperature of the evaporator (4) is 107°C.
Assuming that the temperature of the condensed water accumulated inside is 15° C., the water vapor pressure of the particle layer (8) is 13111 PHO. When the temperature of the condensed water accumulated in the evaporator (4) is 15°C, as shown in Figure 1, the water vapor pressure is equal to that of the particle layer (8
) is equal to the water vapor pressure of 131111118 (+).

Therefore, in order to lower the temperature of the particle layer (8) from 107°C, the pressure was set at 1.2 ko/cm2 in the second boiler (6).
When water is evaporated at a thirst of 104° C., the latent heat of vaporization is taken away, the pressure balance is inevitably disrupted, and a hydration reaction of anhydrous manganese chloride occurs. As a result, heat of hydration is generated in the particle layer (8), and steam is continuously generated in the second boiler (6). Since the condensed water in the evaporator (4) loses heat of evaporation through self-evaporation and its temperature drops, river water at a temperature of 25°C is flowed into the heat transfer section (7) to keep this temperature constant. has been done. The heat transfer section (7) is designed so that the temperature of the water in the evaporator (4) is maintained at 15°C. In addition, water contains 10.6 Kcal per 11201 mol of Mn C12.
(When the amount of heat D is given, the heat of hydration generated in the particle layer (8) is 17.4 Kcal per 1111 o1. Due to this heat of neutralization, the water in the second boiler (6) reaches a temperature of 104°C.
to produce low-pressure steam. Once the water in the evaporator (4) has completely evaporated, the dehydration process is carried out again.

If a plurality of steam generators shown in FIG. 3 are installed and the entire system is operated continuously by alternately switching between the smoke exhaust line and the river water line, the effect will be further improved.

In the above example, the valuable energy is 17.4kc.
By inputting al, 28.0 Kcal of thermal energy 12-1 can be recovered as low-temperature steam.

[Brief explanation of drawings]

FIG. 1 is a graph showing the water vapor pressure curves of manganese chloride monohydrate and water, FIG. 2 is a schematic diagram showing the heat balance, and FIG. 3 is a system diagram showing the steam generator. (1)...Reactor, (2)...Steam passage, (3)
... Condenser, (4) ... Evaporator, (5) ... First
Boiler, (6)...Second boiler, (7)...Heat transfer section, (8)...Particle layer, (9)...Jacket,
(1o)...Smoke exhaust line, (11)...River water line, (12)...Steam water line, (13)...
Heat exchanger, (14) (15) (16) (17)...
·valve. Patent applicant: Hitachi Zosen Corporation

Claims (1)

[Claims] Manganese chloride monohydrate is heated with a high-temperature heat source and dehydrated by the heat of dehydration Q+ according to the reaction of the following formula, Mn Cl 2 ・1'20 (solid) +01→Mn C
l 2 (solid) + H20 (gas)... (I) The generated water vapor is condensed according to the reaction of the following formula to form H2O
(Gas) → 1120 (Liquid) +02 ... (If) The obtained heat of condensation Q2 is used as a heat source for generating the desired low-pressure steam, and on the other hand, after the completion of the above dehydration reaction, the heat of evaporation Q2 obtained from the low-temperature heat source is used. , the condensed water produced in reaction formula (II) is evaporated according to the reaction of the following formula, H2O (liquid) + Q2 → H20 (gas)... (1) The anhydride of manganese chloride is reacted with the following formula with the generated water vapor. Steam generation characterized by using the obtained heat of hydration Q'+ as a heat source for generating desired low-pressure steam. Method.