JP5821411B2 - Steam generator - Google Patents

Description

The present invention relates to a steam generator capable of generating ¹ to 10 kg / cm ² of high-pressure steam from low-temperature heat source water using a heat pump.

A steam generator that generates steam using a vapor compression heat pump is known from Patent Document 1, Patent Document 2, and the like. In the steam generator of Patent Document 1, when trying to generate ¹ to 10 kg / cm ² of high-pressure steam from low-temperature heat source water of less than 100 ° C., the COP (coefficient of performance) of the heat pump deteriorates. For example, when generating steam with a pressure of 5 kg / cm ² using water as the refrigerant, the ideal COP is 3.9, assuming that the low temperature heat source side saturation temperature of the heat pump is 70 ° C. and the high temperature side saturation temperature is 158 ° C. Become. The reason why the COP is lowered is that the power of the compressor is increased by increasing the temperature difference between the low temperature heat source side temperature and the high temperature side temperature (steam generation temperature) of the heat pump.

  The steam generator of Patent Document 2 boosts the steam generated by a two-type absorption heat pump using a steam compressor. In the steam generator of Patent Document 2, the COP can be increased to 11.3 as compared with the steam generator of Patent Document 1.

  However, in order to compress the vapor | steam produced | generated with the 2 type absorption heat pump with a vapor | steam compressor, there exists the following subject. In general, a steam generator of a two-type absorption heat pump cannot take out steam with a dryness of 100%, but is often a steam with poor dryness accompanied by can water containing impurities. In particular, when the steam generator is started, a carry-over occurs and the dryness is generally significantly reduced. In general, the steam compressor is greatly affected by the quality of the sucked-in steam, that is, the dryness. When the dryness of the sucked-in steam is poor, the scale component adheres to the steam compressor and locks, or the corrosive component. Corrosion of the vapor compressor. Therefore, in the steam generator of patent document 2, there exists a subject that a lock | rock of a compressor is produced by adhesion of a scale component, or a compressor is corroded by a corrosive component.

JP 58-40451 A JP 2011-99640 A (Japanese Patent Application No. 2009-255688)

  The problem to be solved by the present invention is a two-type absorption heat pump and vapor compression that can increase the COP and do not cause the compressor to lock due to the adhesion of scale components or corrode the compressor due to corrosive components. It is providing the steam generator using a heat pump.

This invention was made in order to solve the said subject, and the invention of Claim 1 absorbs heat from a 2 type absorption heat pump which produces | generates the 1st vapor | steam of predetermined pressure from heat source water, and a 1st vapor | steam. A vapor compression heat pump including an evaporator and a condenser that generates second steam having a pressure higher than that of the first steam, wherein water is added to the condensed water of the first steam, and the water heat exchange of the condenser is performed. A pressure sensor configured to supply the first steam generated by the two-type absorption heat pump to detect a pressure of a first steam supply path that supplies the steam to the steam heat exchange section of the evaporator; Depending on the detected pressure of the pressure sensor so that the detected pressure of the pressure sensor is connected to the steam supply path, provided with a valve, and a steam discharge path for discharging the generated steam of the two-type absorption heat pump and the detected pressure of the pressure sensor To control the opening and closing of the valve It is characterized by comprising a.

According to the first aspect of the present invention, the COP can be made higher than that of Patent Document 1, and the compressor locks due to the adhesion of the scale component as in Patent Document 2, or the compressor is caused by the corrosive component. It has the effect of not corroding.
In addition, according to the first aspect of the present invention, the first steam pressure can be maintained at a predetermined pressure, and as a result, it is possible to prevent the compressor from being stopped due to the increase in the second steam pressure.

  The invention according to claim 2 is the container according to claim 1, wherein a vessel forming a circulation path with the hydrothermal exchanger, a condensed water tank for storing condensed water of the first steam, and water supply to the vessel or A water supply means for supplying water to the condensed water tank and a pump for supplying the stored water in the condensed water tank to the container are configured to take out the steam in the circulation path as second steam. Yes.

  According to invention of Claim 2, in addition to the effect by the invention of Claim 1, there exists an effect that steam can be supplied stably.

  The invention described in claim 3 is characterized in that, in claim 2, condensed water of the first steam is preferentially supplied to the container or the condensed water tank.

  According to invention of Claim 3, in addition to the effect by the invention of Claim 2, since high temperature condensed water is used preferentially, there exists an effect that a thermal efficiency can be improved.

  According to a fourth aspect of the present invention, in the first to third aspects, the container is provided with a blowing means.

  According to invention of Claim 4, in addition to the effect by the invention of Claims 1-3, since the scale part contained in the 1st vapor | steam can be removed by the said blow means, To the said condenser etc. There is an effect that it is possible to reduce problems caused by adhesion of scales.

  According to the present invention, the COP can be made high, and the compressor is locked due to adhesion of scale components, and the two-type absorption heat pump and the vapor compression heat pump that do not corrode the compressor due to corrosive components are used. A steam generator can be provided.

It is explanatory drawing explaining schematic structure of a steam system provided with the steam generator of Example 1 of this invention. It is a figure explaining the control state of the component of the steam system of FIG. It is a figure explaining the control state of the other component of the steam system of FIG. It is a figure explaining the control state of the other component of the steam system of FIG. It is a figure explaining the control state of the other component of the steam system of FIG. It is explanatory drawing explaining schematic structure of a steam system provided with the steam generator of Example 2 of this invention. It is a figure explaining the control state of the component of the steam system of FIG. It is explanatory drawing explaining schematic structure of a steam system provided with the steam generator of Example 3 of this invention. It is explanatory drawing explaining schematic structure of Example 3 of this invention. It is a figure explaining the control state of the component of the steam system of FIG. It is explanatory drawing explaining schematic structure of the other steam system provided with the steam generator of Example 1 of this invention. It is a figure explaining the control state of the component of the steam system of FIG.

  Next, an embodiment of the steam generator of the present invention will be described. The embodiment of the present invention is suitably implemented in a steam generator using a two-type absorption heat pump.

(Basic embodiment)
This embodiment will be specifically described. The steam generator of this embodiment includes a two-type absorption heat pump that generates first steam having a predetermined pressure from low-temperature heat source water, an evaporator that absorbs heat from the first steam, and a second pressure that is higher than that of the first steam. A steam compression heat pump including a condenser that generates steam, and the feed water is added to the condensed water of the first steam and is supplied to the water heat exchange unit of the condenser.

In the embodiment of the present invention, first, heat is pumped up from the heat source water at a low temperature (for example, less than 100 ° C.) by the two-type absorption heat pump, and the first steam having a predetermined pressure is generated. Then, heat is absorbed from the first steam by the evaporator of the vapor compression heat pump, and the first steam becomes condensed water. Further, the condensed water is supplied with water and supplied to the condenser, where second steam having a pressure higher than that of the first steam (for example, about 1 to 10 kg / cm ² ) is generated.

  According to the steam generator of this embodiment, the condensed water after having absorbed heat in the evaporator is supplied to the condenser again without being discharged out of the apparatus, and is used for generating high-pressure steam. Therefore, the exhaust heat possessed by the low-temperature heat source water can be effectively used. Further, in a steam generator that supplies only condensed water to the condenser to generate high-pressure steam, the pressure due to insufficient cooling of the condenser may increase, and operation may be impossible. If so, such inconvenience can be solved.

Further, as described above, as disclosed in Patent Document 1, when an attempt is made to obtain high-pressure steam of 1 to 10 kg / cm ² from low-temperature heat source water using only a vapor compression heat pump, COP deteriorates. On the other hand, according to the steam generator of this embodiment, compared with the steam generator of the system of patent document 1, COP can be made high.

In addition, when a high pressure steam is obtained by combining a two-type absorption heat pump and a steam compressor as in Patent Document 2, a scale component contained in the first steam from the two-type absorption heat pump adheres to the steam compressor. Or the steam compressor is corroded by corrosive components. On the other hand, according to the steam generator of this embodiment, compared to the steam generator of the method of Patent Document 2, the steam compressor is less likely to lock or corrode, and the two-type absorption heat pump Even if the quality of the first steam is poor, the apparatus is less likely to fail, and high-pressure steam can be generated from the low-temperature heat source water.

(Embodiment including a circulation path, a condensed water tank and a pump)
In this embodiment, it is configured to add water to the condensed water of the first steam and supply it to the water heat exchanger of the condenser to generate the second steam, but this structure is preferable. The aspect is as follows. That is, a container that forms a circulation path with the water heat exchange unit, a condensed water tank that stores condensed water of the first steam, and a water supply unit that supplies water to the container or the condensed water tank, A pump that feeds the stored water in the condensed water tank to the container, and is configured to take out steam in the circulation path as second steam. The said pump is provided in the water supply path which connects the water storage part of the said condensed water tank, and the suitable place of the said container.

  In this preferred embodiment, the condensed water to which the feed water is added is supplied to the condenser while circulating through the circulation path, so that the second steam can be generated stably. Moreover, since the condensed water under the low pressure in the condensed water tank is supplied to the container by the pump, the condensed water can be supplied into the container under the high pressure without any trouble. In addition, when it is set as the feed water supply means which supplies feed water directly to the said container, the said pump (1st pump) and the pump (2nd pump) which supply feed water into the said container under high pressure are required. .

  In this preferred embodiment, a circulation pump for supplying water in the container to the water heat exchange part of the condenser can be provided in the circulation path. This configuration is suitable when the water quality in the container is not good or when the condenser is a horizontal type and the steam escape is poor. When the water quality in the container is good, or when the condenser is a vertical type and the steam escape is good, the circulation pump is not necessarily required.

(Embodiment for preferentially supplying condensed water to water supply)
In this preferable form, it is more preferable that the condensed water of the first steam is supplied to the container or the condensed water tank with priority over the water supply. By comprising in this way, the exhaust heat which condensed water holds can be utilized effectively.

  In this further preferred embodiment, the condensed water tank is constantly supplied into the condensed water tank, and when the water level in the condensed water tank becomes less than a predetermined water level, the condensed water tank is supplied into the condensed water tank by the water supply means. It is realizable by comprising so that water supply may be performed. In addition to this configuration, a mixing unit capable of adjusting the mixing ratio of the condensed water and the feed water is provided, and the mixing unit can be configured to increase the mixing ratio of the condensed water.

  Moreover, this more preferable form WHEREIN: When supplying water with the said water supply means into the said container, according to the water level in the said container, if a water level becomes less than a 1st setting water level, the said condensed water will be driven by a drive of the said 1st pump. Condensed water in the tank is supplied to the container, and when the water level is lower than the second water level lower than the first water level, water is supplied to the container by the water supply means by driving the second pump. This can be achieved. In addition to this configuration, by providing a mixing means capable of adjusting the mixing ratio of the condensed water by the first pump and the feed water by the second pump, the mixing means is configured to increase the mixing ratio of the condensed water. Is also feasible.

(Embodiment with blow means)
In the embodiment described above, preferably, the container is provided with a blowing means. By comprising in this way, the scale part contained in the 1st vapor | steam can be removed, the water quality in the said container can be improved, and the malfunction by the adhesion of the scale to the said condenser etc. can be reduced. The blow means includes a blow passage and a blow valve provided in the blow passage. This blow means can be the same as the blow means provided in the steam boiler can body, and is configured to control the blow valve and adjust the blow amount according to the operation time of the steam generator. Alternatively, the electrical conductivity in the container is measured, and when the electrical conductivity is equal to or higher than the set electrical conductivity, the blow valve can be opened and blown.

(Embodiment comprising heat source water supply control means of a two-type absorption heat pump)
In the embodiment described above, preferably, the heat source water supply control means of the two-type absorption heat pump is provided. The heat source water supply control means includes a pressure sensor that detects an outlet side pressure of steam of the two-type absorption heat pump, a valve provided in a heat source water supply path of the two-type absorption heat pump, and the outlet side pressure is predetermined. And a controller that controls the opening and closing of the valve in accordance with the pressure detected by the pressure sensor. In the form of control of opening and closing of the valve according to the detected pressure of the pressure sensor, when the valve is a valve that can only be opened and closed, the valve is closed when the detected pressure is equal to or higher than the first set pressure, and is less than the first set pressure. Configure to open. When the valve is a valve whose opening can be adjusted, the opening is reduced as the detected pressure increases, and the opening is increased as the detected pressure decreases.

  According to the embodiment provided with this heat source water supply control means, when the outlet side pressure of the two-type absorption heat pump is increased, the supply amount of the heat source water is reduced by controlling the valve. The pressure can be maintained at a predetermined pressure. As a result, an increase in the second steam pressure can be prevented, and a stop of the compressor due to the increase in the second steam pressure can be prevented.

(Embodiment comprising supply steam amount control means of a two-type absorption heat pump)
In the embodiment described above, it is preferable to include supply steam amount control means for the two-type absorption heat pump. The supply steam amount control means includes a pressure sensor that detects a steam outlet pressure of the two-type absorption heat pump, a steam discharge path that includes a valve and discharges steam generated by the two-type absorption heat pump, and the outlet side. A controller that controls opening and closing of the valve according to a pressure detected by the pressure sensor so that the pressure becomes a predetermined pressure. In the form of control of opening and closing of the valve according to the detected pressure of the pressure sensor, when the valve is a valve that can only be opened and closed, the valve opens when the detected pressure is equal to or higher than the first set pressure, and is less than the first set pressure. Configure to close. When the valve is a valve whose opening can be adjusted, the opening is increased as the detected pressure increases, and the opening is decreased as the detected pressure decreases.

  According to the embodiment provided with this supply steam amount control means, when the outlet side pressure of the two-type absorption heat pump rises, the amount of the first steam discharged through the steam discharge line is controlled by controlling the valve. Since the amount of the first steam supplied to the evaporator increases and the first steam pressure decreases, the first steam pressure can be maintained at a predetermined pressure. As a result, an increase in the second steam pressure can be prevented, and a stop of the compressor due to the increase in the second steam pressure can be prevented.

Here, the component which comprises the steam generator of embodiment of this invention is demonstrated. The two-type absorption heat pump does not require an external high-temperature heat source and obtains a use fluid that is higher in temperature than heat source water (such as factory heat source water) that serves as a heat source. In this embodiment, low-temperature (preferably 100 The first steam having a predetermined pressure (for example, about 1 kg / cm ² ) is obtained from the heat source water at a temperature lower than 0 ° C. but may be 100 ° C. or higher. The two-type absorption heat pump is not limited to a specific configuration, but may be configured as described in Patent Document 2, Japanese Patent Laid-Open No. 2-42102, or the like. A two-type absorption heat pump described in Patent Document 2 includes an evaporator having a first heat exchanger therein, an absorber connected to the evaporator by a vapor passage and having a second heat exchanger therein, A three heat exchanger, a condenser having a refrigerant pump for sending the condensed refrigerant liquid to the evaporator, a fourth heat exchanger connected to the condenser by a vapor passage, and an absorption solution A regenerator with a solution pump for sending to the absorber, a fifth heat exchanger inside, and a pump for circulating a heat transfer medium between the second heat exchanger and the fifth heat exchanger And a first steam generator provided with a valve in the feed water supply path and the outlet path of the evaporated first steam, a solution heat exchanger for exchanging heat from the solution from the absorber and the solution from the regenerator, etc. Is done.

A well-known thing is used for the said vapor compression heat pump, and refrigerant | coolants other than water are used for the refrigerant | coolant used. The vapor compression heat pump of this embodiment is configured to generate second steam having a predetermined pressure (1 to 10 kg / cm ² or more) higher than that of the first steam in the condenser.

  The evaporator includes a refrigerant heat exchanging section (referred to as a refrigerant circulation section) through which the refrigerant of the vapor compression heat pump flows, and a vapor heat exchanging section through which the first vapor generated by the two-type absorption heat pump flows. As long as it indirectly exchanges heat (which can be referred to as a steam circulation part), it is not limited to a specific type or structure.

  The condenser is supplied with a refrigerant heat exchange section (referred to as a refrigerant circulation section) through which the refrigerant of the vapor compression heat pump flows, and water obtained by adding water to the condensed water generated by the evaporator. As long as the water heat exchanging part (which can be referred to as a water circulation part) indirectly exchanges heat, it is not limited to a specific type and structure.

  The container is sealed because it has approximately the same high pressure as the second steam. The circulation path includes a forward path for supplying water from the water storage section of the container to the water heat exchange section, and a return path for returning water from the water heat exchange section to the container. As described above, the forward path includes a circulation pump according to the water quality and the structure of the condenser. And preferably, the gas-liquid separator which isolate | separates a 2nd steam and water is provided in the downstream of the water heat exchange part of the said circulation path. This gas-liquid separator can be omitted by taking out the second vapor from the gas phase part of the vessel or taking out the second vapor from the appropriate place in the return path.

  The condensed water tank has a sealed structure or an open structure, and is not limited to a specific structure. The condensed water tank is connected to the steam heat exchange unit by a condensed water supply path having a steam trap.

  Next, the water supply unit will be described. In the case where the water supply means supplies water to the condensed water tank, it is configured to include a water supply supply path connected to the condensed water tank. The water supply supply path can be provided with a water softener, a water supply preheater, and a water supply valve that controls the flow of the water supply supply path.

  When the water supply means supplies water to the container, a water supply tank is provided at the tip of the water supply supply path, and a water storage section of the water supply tank and the container are provided with a water supply pump. Connect with waterways. With this configuration, it is possible to supply water in the water supply tank under atmospheric pressure to the container under high pressure.

(Expansion to steam system of this embodiment)
The steam generator of the embodiment described above can be a steam system combined with a steam boiler. The steam system includes a second steam supply path for supplying second steam generated by the steam generator to a use device, and a third steam supply path for supplying third steam from the steam boiler to the use equipment. Connecting.

  In this steam system, preferably, the second steam of the steam generator is preferentially supplied to the equipment used. By adopting this configuration, the steam generator having a high COP is preferentially used, so that the cost required for steam generation can be reduced.

  The aspect of the configuration in which the second steam is preferentially supplied to the equipment to be used with respect to the third steam includes the following two aspects. The first aspect is provided with a pressure sensor that detects a pressure downstream of a connection portion between the second steam supply path and the third steam supply path, and drives the compressor when the detected pressure is less than a second set value. The steam boiler is stopped, the second steam is generated and supplied, and when the detected pressure is lower than the third set pressure lower than the second set pressure, the steam boiler and the steam compressor are driven. Second steam and third steam are generated and supplied.

  The second mode is a pressure on-off valve that drives the compressor when the pressure is less than the second set pressure, opens at the third steam supply path below the third set pressure, and closes when the pressure exceeds the third set pressure. Prepare. In this second embodiment, when the detected pressure is less than the third set pressure, the second steam and the third steam are generated and supplied. And if it becomes more than 3rd setting pressure, the drive of the said steam boiler will be stopped, the said compressor will be driven, and only 2nd steam will be supplied to the said use apparatus, Therefore 2nd steam with respect to 3rd steam Will be used preferentially.

  In the steam system described above, an ejector that sucks the second steam and raises the pressure by using the third steam as a drive source can be provided at a connection portion between the second steam supply path and the third steam supply path. By carrying out like this, when the supply steam pressure to the said use apparatus is made the same, the pressure of 2nd steam can be made low by providing the said ejector. As a result, the COP of the vapor compression heat pump can be improved.

  Next, Embodiment 1 of the steam generator 1 of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram illustrating a schematic configuration of a steam system 3 in which a steam generator 1 and a steam boiler (hereinafter simply referred to as a boiler) 2 according to the first embodiment are combined, and FIGS. It is a figure explaining the control state of the different component of the steam system of FIG.

<Configuration of steam system>
With reference to FIG. 1, the steam system 3 is provided with the steam generator 1, the boiler 2, and the controller 4 which controls both as main parts.

  The steam generator 1 includes a two-type absorption heat pump (hereinafter simply referred to as an absorption heat pump) 5 that generates first steam having a predetermined pressure from heat source water, an evaporator 6 that absorbs heat from the first steam, and the first steam. And a vapor compression heat pump 8 having a condenser 7 for generating high-pressure second steam. Condensed water of the first steam generated in the evaporator 6 is configured so that water is added to the condensed water and supplied to the condenser 7.

  Similarly to Patent Document 2, the absorption heat pump 5 is connected to the evaporator 9 having the first heat exchanger (not shown) inside, the evaporator 9 and the steam passage, and the second heat exchanger (not shown) inside. , An absorber 10 provided with a third heat exchanger (not shown) inside, a condenser 11 provided with a refrigerant pump (not shown) for sending condensed refrigerant liquid to the evaporator 9, and a condenser 11 A regenerator 12 connected with a vapor passage and provided with a fourth heat exchanger (not shown) inside, a solution pump (not shown) for sending the absorption solution to the absorber 10, and a fifth heat exchanger ( A pump (not shown) for circulating a heat transfer medium between the second heat exchanger and the fifth heat exchanger, and the first feed water supply passage 13 and the evaporated first steam Generation of a first steam provided with a valve (not shown) in the first steam supply path 14 which is an outlet flow path of 15 is configured of a solution from a solution regenerator 12 from the absorber 10 the solution heat exchanger for heat exchange (not shown) and the like.

The absorption heat pump 5 includes a heat source water supply path 17 provided with a heat source water valve 16 and a drain path 18. In the absorption heat pump 5 of the first embodiment, the heat source water from the heat source water supply path 17 is discharged from the drainage path 18 through the evaporator 9 through the regenerator 12.

  The vapor compression heat pump 8 includes a compressor 19, a condenser 7, an expansion valve 20, and an evaporator 6 that are sequentially connected in an annular shape. The compressor 19 compresses the gas refrigerant to a high temperature and a high pressure. The condenser 7 includes a refrigerant heat exchange unit 7A that condenses and liquefies the gas refrigerant from the compressor 19, and a water heat exchange unit that is supplied with water obtained by adding water to the condensed water generated by the evaporator 6. 7B is configured to indirectly exchange heat. The condenser 7 is of a vertical type so that steam can be easily removed from the water heat exchanger 7B.

  Furthermore, the expansion valve 20 allows the liquid refrigerant from the condenser 7 to pass therethrough, thereby reducing the pressure and temperature of the refrigerant. In the evaporator 6, the refrigerant heat exchange unit 6 </ b> A where the refrigerant from the expansion valve 20 evaporates and the vapor heat exchange unit 6 </ b> B to which the first vapor is supplied through the first vapor supply path 14 indirectly exchange heat. It is configured as follows.

  Next, a configuration for generating the second steam from the first steam will be described. The steam generator 1 is a condensate for storing condensate of the first steam generated in the sealed container 22 that forms the circulation path 21 between the steam heat exchanger 7B and the steam heat exchanger 6B of the evaporator 6. A water tank 23, a water supply means 24 for supplying water to the condensate water tank 23, and a first water pump 25 for supplying the water stored in the condensate water tank 23 to the container 22 are provided.

  The circulation path 21 includes a forward path 21A for supplying water from the water storage section of the container 22 to the water heat exchange section 7B, and a return path 21B for returning water from the water heat exchange section 7B to the container 22. A gas-liquid separator 27 that separates the second steam from the circulation path 21 and takes it out from the second steam supply path 26 is provided on the outlet side of the water heat exchanger 7B in the return path 21B. The second steam supply path 26 is provided with a first check valve 28 that blocks the flow in the direction of the gas-liquid separator 27. The first water supply pump 25 is provided in a water supply passage 29 that communicates a water storage part of the condensed water tank 23 and an appropriate place of the container 22.

  The condensed water tank 23 is connected to the steam heat exchange unit 6B by a condensed water supply path 31 including a steam trap 30 that separates and passes the condensed water.

  The feed water supply means 24 includes a second feed water supply path 32 connected to the condensed water tank 23. The second water supply supply path 32 is provided with a water supply valve 35 that controls the flow of the water softener 33, the water supply preheater 34, and the second water supply supply path 32. The water supply preheater 34 is branched from the heat source water supply path 17 and supplied with heat source water, and the heat supply water preheats the water supply.

  The container 22 is provided with blow means 36. The blow means 36 includes a blow passage 37 and a blow valve 38 provided in the blow passage 37. The blow means 36 is configured to adjust the blow amount by opening the blow valve 38 according to the operation time of the steam generator 1.

  The boiler 2 is connected to a fourth steam supply path 40 that supplies steam to a steam using device (not shown) through a third steam supply path 39. The third steam supply path 39 and the second steam supply path 26 are connected by a connection portion 41. The third steam supply path 39 is provided with a second check valve 42 for blocking the flow in the boiler 2 direction. Reference numeral 47 is a third check valve that blocks the flow from the container 22 toward the first water supply pump 25.

The controller 4 includes a first water level sensor 43 that detects the water level in the container 22, a second water level sensor 44 that detects the water level in the condensed water tank 23, and a first pressure sensor that detects the pressure in the first steam supply path 14. 45, a signal from the second pressure sensor 46 for detecting the pressure downstream of the connecting portion 41, etc. is input, and the absorption heat pump 5, the heat source water valve 16, the compression of the steam generator 1 according to a previously stored control procedure The machine 19, the 1st water supply pump 25, the water supply valve 35, the boiler 2, etc. are controlled.

  In the control procedure by the controller 4, the water level in the container 22 is controlled to be constant, and the condensed water supplied through the condensed water supply path 31 is preferentially supplied to the water supplied by the water supply means 24. The water supply control procedure for supplying water, the heat source water supply control procedure for controlling the supply of heat source water to the absorption heat pump 5, and the second steam generated by the steam generator 1 are generated by the boiler 2. A steam supply control procedure for preferentially supplying to the equipment to be used with respect to the three steams.

  As shown in FIG. 2, in the water supply control procedure, when the detected water level of the first water level sensor 43 becomes less than the first set water level L1, the water feed pump 25 is turned on (driven), and becomes the first set water level L1 or higher. The constant water level control procedure of the container 22 for turning off (stopping) the water pump 25, and as shown in FIG. 3, when the detected water level of the second water level sensor 44 is less than the second set water level L2, the water supply valve 35 is opened, Condensed water priority supply control procedure for closing the water supply valve 35 when the set water level is exceeded is included. In addition, when the water level in the condensed water tank 23 becomes an overflow water level higher than the 2nd setting water level L2, it comprises so that the drain valve (illustration omitted) provided in the condensed water tank 23 may be opened. In the above description and the following description, it goes without saying that a differential (operation gap) is set for each of the set water level and the set pressure.

  As shown in FIG. 4, the heat source water control procedure closes the heat source water valve 16 when the detected pressure of the first pressure sensor 45 is equal to or higher than the first set pressure P1, and opens the heat source water valve 16 when the pressure is lower than the first set pressure. Includes control.

  As shown in FIG. 5, the steam supply control procedure turns off the compressor 19 when the pressure detected by the second pressure sensor 46 is equal to or higher than the second set pressure P2, and turns on the compressor 19 when the pressure is lower than the second set pressure P2. In addition, the control includes turning off the boiler 2 when the pressure becomes equal to or higher than the third set pressure P3 lower than the second set pressure P2, and turning on the boiler 2 when it becomes less than the third set pressure P3.

<Operation of steam system> (Operation at system startup)
Operation | movement of a steam system provided with Example 1 provided with the above structure is demonstrated.
A system start switch (not shown) is operated to drive the steam system 3. Then, the controller 4 drives the steam generator 1 and the boiler 2 as shown in FIG. 5 because the detected pressure of the second pressure sensor 46 is lower than the third set pressure P3 at the beginning of the system startup.

  In the steam generator 1, while the absorption heat pump 5 is driven, a storage operation is performed when a predetermined amount of water is not stored in the container 22, and a storage operation is performed when water is stored in the previous operation. Absent. This storage operation is an operation of opening the water supply valve 35, supplying water to the condensed water tank 22, driving the water supply pump 25, and supplying water to the container 22.

  In the absorption heat pump 5, the heat source water valve 16 is opened, heat source water of about 80 ° C. is supplied from the heat source water supply path 17 into the absorption heat pump 5, and the generation of the first steam is started.

A predetermined amount of water is stored in the container 22, and by driving the absorption heat pump 5, about 1 kg / cm ² of first steam is sent from the first steam supply path 14 based on a signal from the first pressure sensor 45. Then, the controller 4 drives the compressor 19. Then, in the evaporator 6, the steam heat exchange unit 6A absorbs heat from the first steam, and the first steam is condensed. In the steam and condensed water mixture, the condensed water is separated by the steam trap 30 and flows into the condensed water tank 23.

On the other hand, in the condenser 7, water is supplied from the container 22, and about 5 kg / cm ² of second steam is generated in the water heat exchanger 7B. Thus, at the time of system startup, when the detected pressure of the second pressure sensor 46 is less than the third set pressure P3, the second steam from the steam generator 1 and the third steam from the boiler merge at the connection portion 41. Then, it is supplied to the used equipment through the fourth steam supply path 40.

(Water level control of container 22)
As shown in FIG. 2, the water level of the container 22 is controlled to a water level within a certain range by controlling the water supply pump 25 so that the detected water level of the first water level sensor 43 becomes the first set water level L1.

(Water level control of the condensed water tank 23)
The condensed water tank 23 is supplied with condensed water from the condensed water supply path 31 and water supplied from the second feed water supply path 32, but the condensed water is preferentially supplied. This priority supply is realized by controlling the water supply valve 35 as shown in FIG. That is, when the detected water level of the second water level sensor 44 is equal to or higher than the second set water level L2, the water supply valve 35 is closed, and only condensed water is supplied to the condensed water tank 23 through the condensed water supply path 35. Only after the water level becomes lower than the second set water level L2, the feed water is also supplied to the condensed water tank 23 from the second feed water supply path 32. At this time, condensed water is also supplied from the condensed water supply path 31.

By this condensed water preferential supply, the second steam generation by the high COP by the combination of the absorption heat pump 5 and the vapor compression heat pump 8 is performed. The generation of the second steam by the water supply from the second water supply supply path 32 is performed only by the vapor compression heat pump 8 without using the absorption heat pump 5 as in the case of Patent Document 1. When water is used as the refrigerant of the vapor compression heat pump 8 to generate steam at a pressure of 5 kg / cm ² , assuming that the evaporator 6 side saturation temperature is 70 ° C. and the condenser 7 side saturation temperature is 158 ° C., the COP is Although it is only about 3.9, the COP by the steam generator 1 can ideally realize a high COP close to 11.3.

(Heat source water supply control of absorption heat pump 5)
The controller 4 closes the heat source water valve 16 when the pressure detected by the first pressure sensor 45 is equal to or higher than the first set pressure P1, and opens the heat source water valve 16 when the pressure falls below the first set pressure P1. By controlling the supply amount of such heat source water, the first steam pressure can be maintained at the first set pressure P1. As a result, it is possible to prevent the compressor from being stopped due to an increase in the second steam pressure.

(Operation after system startup)
When the detected pressure of the second pressure sensor 46 becomes equal to or higher than the third set pressure P3 after the system is started, the controller 4 stops the operation of the boiler 2, so that only the second steam generated by the steam generator 1 is generated. It will be supplied to used equipment through the fourth steam supply 40.

  According to the steam generator 1 of the first embodiment described above, the condensed water that has been absorbed by the evaporator 6 is supplied again to the condenser 7 without being discharged out of the apparatus, thereby generating high-pressure steam. Used for As a result, the exhaust heat possessed by the low-temperature heat source water can be effectively utilized. Further, in the steam generator that supplies only condensed water to the condenser 7 to generate high-pressure steam, the pressure due to insufficient cooling of the condenser 7 may increase and the operation may become impossible. According to this, it is possible to prevent an increase in pressure due to insufficient cooling of the condenser, and it is possible to avoid a situation where the operation becomes impossible.

  Moreover, according to the steam generator 1 of Example 1, compared with the steam generator of the system of patent document 2, there is less occurrence of lock and corrosion of the steam compressor, and the first steam from the absorption heat pump 5 is generated. Even if the quality of the device is poor, it is unlikely to cause equipment failure. Furthermore, since the container 22 is provided with the blow means 36, the water quality in the container 22 can be improved, and the adhesion of the scale to the hydrothermal exchanger 7B of the condenser 7 can be reduced.

  The present invention is not limited to the first embodiment, but includes the steam generator 1 of the second embodiment shown in FIG. In the second embodiment, a configuration different from the first embodiment will be described below. In addition, in Example 2, the same component as the said Example 1 attaches | subjects the same code | symbol, and abbreviate | omits the description.

  In the said Example 1, the heat source water supply control means is provided. This heat source water supply control means includes a heat source water supply path 17 in which a heat source water valve 16 is provided in the absorption heat pump 5, and the controller 4 controls the heat source water valve 16 to thereby provide a heat source for the absorption heat pump 5. The heat source water supply control procedure for controlling the water supply is performed.

  In contrast, the second embodiment includes supply steam amount control means instead of the heat source water supply control means. This supply steam amount control means includes a first pressure sensor 45, a steam discharge passage 49 that includes a steam valve 48 and discharges the first steam of the absorption heat pump 5, and a steam valve according to the detected pressure of the first pressure sensor 45. It is comprised including the controller 4 which controls opening and closing of 48. The controller 4 controls the steam valve 48 according to the supply steam amount control procedure.

  As shown in FIG. 7, when the detected pressure by the first pressure sensor 45 becomes equal to or higher than the first set pressure P1, the supply steam amount control procedure opens the steam valve 48, and when the detected pressure becomes less than the first set pressure P1, 48 is closed. By controlling the supply amount of the first steam, the first steam pressure can be maintained at the first set pressure P1. As a result, it is possible to prevent the compressor from being stopped due to an increase in the second steam pressure.

  The present invention is not limited to the first and second embodiments, but includes the steam generator 1 of the third embodiment shown in FIG. The third embodiment is different from the first embodiment in that a circulation pump 50 is provided in the forward path 21 </ b> A of the circulation path 21. Since the other configuration is the same as that of the first embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.

  According to the third embodiment, since the water in the container 22 is forcibly circulated and supplied to the hydrothermal exchanger 7B by the circulation pump 50, the water quality in the container 22 is poor or the condenser 7 is placed horizontally. Even when the steam is poor in the mold, the water circulation in the circulation path 22 can be reliably performed, and the second steam can be efficiently generated.

  In the second embodiment, the circulation pump 50 can be provided.

  This invention is not limited to the said Examples 1-3, The steam generator 1 of Example 4 shown in FIG. 9 is included. In the fourth embodiment, a configuration different from the first embodiment will be described below. Since the other configuration is the same as that of the first embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.

  The difference from the first embodiment is that the water supply by the water supply means 24 is directly supplied to the container 22 instead of passing through the condensed water tank 23. And the water supply tank 52 provided with the 3rd water level sensor 51 in the downstream of the water supply valve 35, and the 2nd water supply pump 53 which supplies the water supply stored in the water supply tank 52 to the container 22 are provided. Reference numeral 54 is a fourth check valve that prevents the flow from the container 22 toward the second water supply pump 53.

The second water supply pump 53 and the first water supply pump 25 are controlled as shown in FIG. 10 so that condensed water is preferentially supplied to the container 22. That is, when the detected water level of the first water level sensor 43 is equal to or higher than the third set water level L3, the first feed water pump 25 and the second feed water pump 53 are respectively turned off. The second water supply pump 52 is turned off and the condensed water in the condensed water tank 23 is supplied to the container 22. When the detected water level of the first water level sensor 43 becomes lower than the fourth set water level L4 lower than the third set water level, the first water supply pump 25 and the second water supply pump 53 are turned on. Thus, the condensed water is used preferentially over the water supply.

  In the fourth embodiment, when the water level detected by the second water level sensor 44 is lower than a predetermined low water level, the first water supply pump 25 is turned off, and the first water supply pump 25 is prevented from running idly. Further, when the water level detected by the second water level sensor 44 becomes equal to or higher than a predetermined overflow water level, a drain valve (not shown) provided in the condensed water tank 23 is opened.

  In Example 4, the configuration of Example 2 or Example 3 can be employed.

  This invention is not limited to the said Examples 1-4, A various change is possible. The steam system 3 shown in FIG. 1 has the configuration shown in FIG. 11, and can be a steam system 3 controlled as shown in FIG. 11 and 12, the compressor 19 is turned off when the detected pressure of the second pressure sensor 46 is equal to or higher than the second set pressure P2, and the compressor 19 is turned on when it is lower than the second set pressure P2. Configure. The third steam supply passage 39 is provided with a pressure on-off valve 55 that opens below the third set pressure P3 and closes at the third set pressure or higher.

  In the steam system 3 of FIG. 11, when the detected pressure of the second pressure sensor 46 is less than the second set pressure P2, the second steam and the third steam are generated and supplied. When the pressure is equal to or higher than the second set pressure P2, the steam opening / closing valve 55 closes the third steam supply path 39, whereby the steam boiler 2 is turned off and the compressor 19 is turned on. As a result, since only the second steam is supplied to the use device, the second steam is used preferentially over the third steam.

  Further, the steam system 3 shown in FIGS. 6, 8, and 9 can employ the same configuration as that in FIG. 11.

DESCRIPTION OF SYMBOLS 1 Steam generator 2 Steam boiler 3 Steam system 4 Controller 5 2 type absorption heat pump 6 Evaporator 7 Condenser 7A Water heat exchange part 8 Steam compression heat pump 16 Heat source water valve (valve)
17 Heat source water supply path (supply path)
19 Compressor 21 Circulation path 22 Container 23 Condensed water tank 24 Water supply means 25 First water supply pump (water supply pump)
45 First pressure sensor (pressure sensor)
47 Steam valve (valve)
48 Steam release passage

Claims (4)

A two-type absorption heat pump that generates first steam of a predetermined pressure from heat source water;
A vapor compression heat pump including an evaporator that absorbs heat from the first steam and a condenser that generates second steam having a pressure higher than that of the first steam;
The feed water is added to the condensed water of the first steam, and is configured to be supplied to the water heat exchange unit of the condenser ,
A pressure sensor for detecting the pressure of the first steam supply path for supplying the first steam generated by the two-type absorption heat pump to the steam heat exchange section of the evaporator ;
A steam discharge path connected to the first steam supply path, provided with a valve, for discharging steam generated by the two-type absorption heat pump;
And a controller that controls opening and closing of the valve in accordance with the pressure detected by the pressure sensor so that the pressure detected by the pressure sensor becomes a predetermined pressure. A container that forms a circulation path with the water heat exchange unit;
A condensed water tank for storing condensed water of the first steam;
Water supply means for supplying water to the container or the condensed water tank;
A pump for feeding water stored in the condensed water tank to the container;
The steam generator according to claim 1, wherein the steam is extracted from the circulation path as second steam. The steam generation apparatus according to claim 2, wherein the condensed water of the first steam is preferentially supplied to the container or the condensed water tank. The steam generator according to any one of claims 1 to 3, wherein the container includes a blowing means.

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