JP4579644B2 - Steam exhaust system - Google Patents

Description

  The present invention relates to a steam exhaust system. More specifically, the present invention relates to a steam discharge system that pre-processes high-pressure steam discharged from the factory or the like into the atmosphere to effectively use heat.

JP 2002-89994 A

  For example, as shown in FIG. 4, a conventional steam exhaust system includes a gas-liquid separation tank 102 that receives high-pressure steam exhausted from an exhaust heat source 101, and a first chimney that releases steam in the gas-liquid separation tank 102 ( Steam discharge pipe) 103, a high-temperature drain water tank 104 for storing the high-temperature drain water separated in the gas-liquid separation tank 102, and a first drain for discharging the steam separated in the high-temperature drain water tank 104. 2 chimneys (steam discharge pipes) 105 and a drainage pump 106 for draining the high-temperature drain water from the high-temperature drain water tank 104.

In such a steam exhaust system 100, when high-pressure steam of about 170 ° C. and 10 kg / cm ² , for example, is exhausted from the exhaust heat source 101, steam at 100 ° C. and atmospheric pressure in the gas-liquid separation tank 102 and 98 ° C. Separated into hot drain water. Then, the steam is discharged from the first chimney 103 to the outside air, and the separated high-temperature drain water at 98 ° C. is temporarily stored in the high-temperature drain water tank 104 and becomes, for example, about 95 ° C. When the high-pressure drain water tank 104 is full, it is sent to a boiler building or the like by a drain pump 106 and finally drained into sewage or a river. The steam generated in the high-temperature drain water tank 104 is discharged from the second chimney 105 to the atmosphere.

  On the other hand, Patent Document 1 discloses a generator using a gas turbine as a drive source, an exhaust heat recovery device including a gas boiler and a gas-liquid separator, an exhaust heat utilization device including an absorption chiller / heater, and a cooling water pump. An exhaust-heat-use absorption chilled / hot water device including other equipment such as a cooling tower is disclosed. In this system, steam is generated by a gas boiler using exhaust heat from a gas turbine, and the steam is used as a heat source for an absorption chiller / heater.

  In the conventional steam discharge system 100, the first chimney 103 is considerably higher than the roof of the factory, and the discharged steam is also as high as about 100 ° C., so that it immediately condenses into a white smoke-like mist 107 at the time of discharge. . Especially in the winter when the outside temperature is low, there is a problem that it is mischievous that it emits harmful smoke in spite of its inherently harmless mist, resulting in complaints from surrounding houses. Further, since waste steam heat is wasted, there is a loss of heat energy. Moreover, since the temperature of the high-temperature drain water to be discharged is high, it is necessary to reduce the temperature and cost, such as radiating heat before discharging or mixing with cold water.

  It is a technical problem of the present invention to solve the problems of the conventional steam discharge system 100, to provide a steam discharge system that can reduce the discharge of white smoke mist 107 as much as possible, and can effectively reuse the steam exhaust heat. Yes.

Steam exhaust system of the present invention, a gas-liquid separation tank for separating the high-pressure steam discharged from the factory into the atmosphere and Atsushi Ko drain water vapor, and steam discharge path for releasing the separated vapor and separated a steam discharge system comprising a drainage path for draining Atsushi Ko drain water, the waste steam heat exchanger which is interposed between the steam discharge pathway, the heat medium heated by the waste steam heat exchanger circulation And a waste heat utilization subsystem comprising waste heat utilization equipment that utilizes the heat of the heat medium flowing through the heat medium path, and receives the high temperature drain water in the gas-liquid separation tank. A waste heat recovery subsystem is provided that exchanges heat between the tank and the high-temperature drain water in the high-temperature drain water tank and the heat medium in the heat medium path in the exhaust heat utilization subsystem .

Furthermore, it is preferable to include a heat dissipation subsystem that radiates excess heat in the exhaust steam heat exchanger to the outside. In that case, the heat medium path is separated into a primary side heat medium path on the exhaust steam heat exchanger side and a secondary side heat medium path on the exhaust heat utilization equipment side via a heat exchanger interposed in the middle. It is preferable that the heat dissipation subsystem is interposed in the return side path of the primary side heat medium path.
Further, the secondary side heat medium path indirectly exchanges heat between the high-temperature drain water and the heat medium of the heat medium path in the exhaust heat utilization subsystem from the exhaust heat hot water heat exchanger in the exhaust heat utilization apparatus. It is preferable to circulate so as to return to the original waste heat hot water heat exchanger via a heat exchanger that separates the primary side heat medium path and the secondary side heat medium path and exchanges heat.
In any of the steam exhaust systems, the exhaust heat utilization device uses an exhaust heat input type absorption chiller / heater that utilizes heat of the heat medium flowing through the heat medium path by indirectly exchanging heat with a diluted solution of the absorption liquid. It can be .

  In the steam exhaust system of the present invention, an exhaust steam heat exchanger is provided in the steam exhaust path, and the heat of the steam is supplied to the heat medium flowing through the heat medium path in the exhaust steam heat exchanger, and the steam itself is cooled. Is done. Therefore, when the steam is discharged into the outside air from the steam discharge path, white smoke-like fog does not appear or becomes thin. Therefore, it is not misunderstood that harmful smoke is emitted. Furthermore, since the heat of the heat medium is effectively used as a heat source of the exhaust heat utilization device, it is possible to effectively use the heat energy that has been wasted in the past.

Furthermore, the high temperature drain water tank for receiving the high temperature drain water of the gas-liquid separation in a tank, and a heat medium of the heat medium passage in the heat and the waste heat utilization subsystem hot drain water of the hot drain water tank heat it is provided with the exhaust heat recovery subsystem exchange, thermal energy of hot drain water discharged may also be effectively utilized as a heat source of waste heat utilization device. Furthermore, since the temperature of the drain water is also lowered, the extra work such as lowering the temperature by mixing cold water is reduced.

  Furthermore, when a heat dissipation subsystem that dissipates excess heat in the exhaust steam heat exchanger to the outside is provided, the steam can be sufficiently cooled in the exhaust steam heat exchanger, and generation of white smoke-like mist Can be further suppressed. Further, the heat medium path is separated into a primary side heat medium path on the exhaust steam heat exchanger side and a secondary side heat medium path on the exhaust heat utilization equipment side through a heat exchanger interposed in the middle. When the heat dissipation subsystem is interposed in the return side path of the primary side heat medium path, the pipe line is simplified. In addition, since the heat medium path is separated into the primary side heat medium path and the secondary side heat medium path through the heat exchanger, the cooling action is achieved even if the operation of the exhaust heat utilization device is stopped, Smoke generation can be prevented.

  Next, a preferred embodiment of the steam exhaust system of the present invention will be described with reference to the drawings. FIG. 1 is a piping system diagram showing an embodiment of the steam exhaust system of the present invention, FIG. 2 is a piping system diagram showing the operation of the steam exhaust system, and FIG. 3 shows another embodiment of the steam exhaust system of the present invention. It is a principal part piping system diagram.

  The steam exhaust system S shown in FIG. 1 is broadly viewed as an exhaust heat utilization subsystem S1 that uses the heat of exhaust steam exhausted from the exhaust heat source 10 and an exhaust heat recovery subsystem S2 that recovers the heat of high-temperature drain water. And a heat dissipation subsystem S3 that dissipates excess heat of the exhaust steam.

  The exhaust heat source 10 is connected to a gas-liquid separation tank 11 through a steam line 10a, and a second steam for discharging the vapor depressurized in the tank is provided above the gas-liquid separation tank 11. A pipeline 11a is connected. A drain water pipe 11 b for discharging high-temperature drain water separated in the tank is connected to the lower part of the gas-liquid separation tank 11. The other end of the drain water pipe 11b is connected to a high-temperature drain water tank 12, a drain pipe 12a is connected to the lower part thereof, and a drain pump 13 is interposed in the middle.

  A second steam discharge pipe 12b for discharging steam separated from the high-temperature drain water is connected to the upper part of the high-temperature drain water tank 12, and the other end of the second steam discharge pipe 12b. Is connected to the second chimney 12c. The gas-liquid separation tank 11 and the high-temperature drain water tank 12 can be substantially the same as those used in the conventional steam exhaust system 100 of FIG.

  Next, the exhaust heat utilization subsystem S1 will be described. The other end of the second steam line 11 a is connected to the exhaust steam heat exchanger 14. A steam discharge pipe 14a for discharging steam is connected to the upper part of the exhaust steam heat exchanger 14, and thereby led to the first chimney 14b. A second drain pipe 14c for discharging condensed water is connected to the lower part of the exhaust steam heat exchanger 14. The other end of the second drain pipe 14c is led to the drain tank 15. A third drain line 15b is connected to the drainage tank 15 via a drainage pump 15a for draining when the drainage tank is full.

  The exhaust steam heat exchanger 14 accommodates a coil 16a of a closed loop circulation line 16 that circulates a heat medium that receives heat from the exhaust steam. The circulation circuit 16 is connected to the primary coil 17a for heat exchange of the first heat exchanger 17, and is connected to the primary coil 18a of the second heat exchanger 18 from the outlet of the coil 17a. . From the outlet of the primary side coil 18a of the second heat exchanger 18, it returns to the coil 16a in the exhaust steam heat exchanger 14 via the heat medium circulating pump 19. As the heat medium flowing through the circulation pipe 16, water is usually used. The second heat exchanger 18 is a component of the heat dissipation subsystem S3.

  The secondary coil 17b of the first heat exchanger 17 is connected to an exhaust heat utilization device, for example, an exhaust heat input type absorption chiller / heater (generlink; hereinafter referred to as chiller / heater) through an exhaust heat utilization conduit 20. 21 is connected to a waste heat hot water heat exchanger 21a. The exhaust heat utilization pipe line 20 coming out from the exhaust heat hot water heat exchanger 21a of the chiller / heater 21 reaches a secondary side coil 23b of a third heat exchanger 23 to be described later via an exhaust heat utilization pump 22, Furthermore, it has returned to the secondary coil 17 b of the first heat exchanger 17. A heat medium such as high-temperature water flows through the exhaust heat utilization pipe line 20. The third heat exchanger 23 is an element of the exhaust heat recovery subsystem S2.

  In the heat dissipation subsystem S3, the secondary coil 18b of the second heat exchanger 18 is led to the surplus heat dissipation cooling tower 26 via the heat dissipation conduit 25, and the water passing through the inside is cooled by the outside air. It is configured so that it is showered and collected at the bottom. The return side of the heat radiating duct 25 is connected so as to return to the secondary coil 18 b of the second heat exchanger 18 described above via the cooling water pump 27.

  Furthermore, in this embodiment, the exhaust heat recovery sub-system S2 is provided with an exhaust heat recovery pipeline 28 that uses the exhaust heat of the high-temperature drain water in the high-temperature drain water tank 12 as a heat source for the cold / hot water machine 21. The exhaust heat recovery pipe line 28 is piped in a loop shape from the drain water tank 12 via the exhaust heat recovery pump 28 a to the primary coil 23 a of the third heat exchanger 23 and returning to the high temperature drain water tank 12. Yes.

  In the steam exhaust system S configured as described above, the exhaust steam heat exchanger 14, the first heat exchanger 17, the chiller / heater 21, the circulation pipe 16 connecting them and the exhaust heat utilization pipe 20. The exhaust heat utilization subsystem S 1 that uses the heat of the exhaust steam as a heat source of the chiller / heater 21 is configured by the heat medium circulation pump 19 and the exhaust heat utilization pump 22. The second heat exchanger 18, the heat radiation cooling tower 26, and the heat radiation pipe line 25 constitute a heat radiation subsystem S3 that cools the heat medium of the circulation circuit 16. Further, the third heat exchanger 23, the exhaust heat recovery pipeline 28, and the exhaust heat recovery pump 28a constitute an exhaust heat recovery subsystem S2. Although it is not always necessary to provide the heat dissipation subsystem S3 and the exhaust heat recovery subsystem S2, white smoke from the first chimney 14b can be reduced and the utilization efficiency of exhaust heat is increased.

Next, the operation of the steam exhaust system S will be described with reference to FIG. The high-temperature and high-pressure steam discharged from the exhaust heat source 10 is supplied to the gas-liquid separation tank 11 at about 170 ° C. and 10 kg / cm ² , for example, and is separated into steam at atmospheric pressure and drain at 98 ° C. at 100 ° C. . The steam reaches the exhaust steam heat exchanger 14 via the steam line 11 a and raises the temperature of the heat medium in the circulation line 16. Then, the steam itself is cooled and discharged to the outside air from the first chimney 14b via the steam discharge pipe 14a.

  A heat medium such as water flowing through the circulation pipe 16 is heated to, for example, 95 ° C. in the exhaust steam heat exchanger 14, and is directed to the first heat exchanger 17 by the action of the heat medium circulation pump 19. Then, heat is supplied to the return heat medium in the exhaust heat utilization pipe line 20 by the first heat exchanger 17, and the heat medium itself is cooled to about 82 ° C., for example. Then, the cooled heat medium is directed to the second heat exchanger 18 via the circulation line 16. Therefore, heat is transferred to a heat medium such as water flowing through the heat radiating pipe 25, and the heat medium itself is cooled to, for example, 65 ° C. and then returned to the exhaust steam heat exchanger 14.

  Then, the cooled heat medium becomes a counter flow with the steam rising in the exhaust steam heat exchanger 14 and cools the steam to, for example, about 50 ° C. As described above, the sufficiently cooled steam is discharged from the first chimney 14b into the outside air, so that it does not condense into fine water droplets and the generation of white smoke is suppressed.

  The heat medium flowing through the heat radiation pipe 25 passes through the cooling tower 26 and is showered to radiate surplus heat, and returns to the second heat exchanger 18 again. On the other hand, the heat medium coming out of the chiller / heater 21 flows through the exhaust heat utilization pipe line 20 at about 80 ° C., for example, and is heated to, for example, about 82.7 ° C. in the third heat exchanger 23. Furthermore, the heat medium is heated to, for example, 90 ° C. in the first heat exchanger 17 and returns to the cold / hot water 21.

  Then, the absorbent that has absorbed the refrigerant (refrigerant water, refrigerant vapor) flowing through the exhaust heat hot water heat exchanger 21a, for example, an aqueous lithium bromide solution, is heated to release the refrigerant absorbed by the absorbent and regenerate it. The regenerated absorbent can absorb the refrigerant and the like again with an absorber (not shown), and can obtain cold water by using the cold heat generated at that time. In addition, gas is burned when obtaining warm water.

  On the other hand, high-temperature water separated in the gas-liquid separation tank 11, for example, high-temperature water at 98 ° C. flows into the high-temperature drain water tank 12, and accumulates at about 95 ° C. therein. The high-temperature water flows through the exhaust heat recovery pipe line 28 by the exhaust heat recovery pump 28a, gives heat to the heat medium in the exhaust heat utilization pipe line by the third heat exchanger 23, and the high-temperature water itself is, for example, 82 ° C. The temperature drops to a certain extent and returns to the high-temperature drain water tank 12. Thereby, high-temperature water at 98 ° C. flowing from the gas-liquid separation tank 11 is cooled to about 95 ° C.

  The condensed water in the exhaust steam heat exchanger 14 is sent to the drain tank 15 at about 85 ° C., for example, and drained by the drain pump 15a. Further, when the high-temperature drain water tank 12 becomes full, the drainage pump 13 is operated to drain water, and the water level is lowered.

  As described above, in the steam exhaust system S, the heat medium in the exhaust heat utilization pipe line 20 is first heated using the heat of the high-temperature water out of the high-temperature water and steam separated in the gas-liquid separation tank 11 (exhaust gas). The heat recovery subsystem S2) and the heat of the steam are further used to perform two-stage heat exchange, in which the temperature of the heat medium in the circulation line 16 is increased (exhaust heat utilization subsystem S1). Therefore, the utilization efficiency of exhaust heat is high. Since the temperature of the high-temperature water is lower than that of steam, the temperature is raised in the exhaust heat recovery subsystem S2 and then raised in the exhaust heat utilization subsystem S1.

  Further, in the steam discharge system S, excess heat is dissipated by the cooling tower 26 (heat dissipating subsystem S3). Therefore, the temperature in the exhaust steam heat exchanger 14 can be decreased, the temperature of the steam discharged from the first chimney 14b can be greatly decreased, and the generation of white smoke due to the exhaust steam can be suppressed. . Moreover, the heat transfer between both is indirectly performed by heat-exchanging the circulation line 16 and the waste heat utilization pipe line 20 with a 1st heat exchanger. Thereby, even in a state where the operation of the chiller / heater 21 is stopped, the temperature of the steam in the exhaust steam heat exchanger 14 can be lowered by the cooling tower 26, and the generation of white smoke from the first chimney 14b is prevented. can do.

  In the above-described embodiment, the heat dissipation subsystem S3 is adopted. However, the heat dissipation subsystem S3 can be omitted when the generation of white smoke due to exhaust steam is small, such as in regions where the temperature is high. In that case, the first heat exchanger 17 can also be omitted. Further, in the exhaust steam system S of FIG. 1, since the second heat exchanger 18 is interposed between the heat dissipation subsystem S3 and the exhaust heat utilization subsystem S1, the generation of white smoke-like steam is small, such as in summer. It is also possible to stop the operation of the cooling tower 26 at the time. In either case, the exhaust heat utilization efficiency of the exhaust steam is somewhat reduced, but the exhaust heat recovery subsystem S2 can be omitted.

  In the above-described embodiment, the circulation pipe 16 serves as a part of the exhaust heat utilization subsystem S1 and a part of the heat dissipation subsystem S3. However, depending on the piping situation, the circulation pipe 16 may be separated as shown in FIG. In the case of FIG. 3, the exhaust heat utilization conduit 20 is directly connected to the exhaust steam heat exchanger 14, and a heat radiation conduit 25 is coupled separately. In the embodiment of FIG. 3, the exhaust heat recovery subsystem S2 is omitted. In the case of FIG. 3, the operation of the exhaust heat utilization device and the operation of the cooling tower 26 can be stopped individually.

It is a piping system diagram showing one embodiment of the steam discharge system of the present invention. It is a piping system diagram which shows the effect | action of the steam exhaust system. It is a principal part piping system diagram showing other embodiments of the steam exhaust system of the present invention. It is a piping system diagram which shows an example of the conventional steam discharge system.

Explanation of symbols

S Steam exhaust system S1 Waste heat utilization subsystem S2 Waste heat recovery subsystem S3 Heat radiation subsystem 10 Waste heat source 10a Steam conduit 11 Gas-liquid separation tank 11a Second steam conduit 11b Drain water conduit 12 High-temperature drain water tank 12a Drain Pipe line 12b Second steam discharge pipe 13 Drain pump 14 Waste steam heat exchanger 14a Steam discharge pipe 14b First chimney 14c Second drain pipe 15 Drain tank 15a Drain pump 15b Third drain pipe 16 Circulation line 16a Coil 17 First heat exchanger 17a Primary side coil 17b Secondary side coil 18 Second heat exchanger 18a Primary side coil 18b Secondary side coil 19 Pump 20 Waste heat utilization pipe line 21 21a Waste heat hot water heat exchanger 22 Waste heat utilization pump 23 Third heat exchanger 23a Primary side coil 23b Secondary side coil 25 Heat radiation pipe 26 Cold Tower 27 cooling water pump 28 exhaust heat recovery pipe 28a exhaust heat recovery pump

Claims (4)

A gas-liquid separation tank for separating the high-pressure steam discharged from the factory into the atmosphere and Atsushi Ko drain water vapor, drained and steam discharge path for releasing the separated steam, the separated Atsushi Ko drain water drainage A steam exhaust system with a path ,
An exhaust steam heat exchanger interposed in the steam exhaust path;
A heat medium path for circulating the heat medium heated by the exhaust steam heat exchanger,
A waste heat utilization subsystem comprising waste heat utilization equipment that utilizes the heat of the heat medium flowing through the heat medium path ,
A high-temperature drain water tank that receives the high-temperature drain water in the gas-liquid separation tank, and exhaust heat recovery that exchanges heat between the high-temperature drain water in the high-temperature drain water tank and the heat medium in the heat medium path in the exhaust heat utilization subsystem. A steam exhaust system with a subsystem . The heat medium path is separated into a primary side heat medium path on the exhaust steam heat exchanger side and a secondary side heat medium path on the exhaust heat utilization equipment side via a heat exchanger interposed in the middle, The steam discharge system according to claim 1 , wherein a heat dissipation subsystem for dissipating excess heat in the exhaust steam heat exchanger to the outside is interposed in a return side path of a side heat medium path . A heat exchanger in which the secondary heat medium path indirectly exchanges heat between the high-temperature drain water and the heat medium in the heat medium path in the exhaust heat utilization subsystem from the exhaust heat hot water heat exchanger in the exhaust heat utilization apparatus . and said you circulated back to the primary side heat medium passage and the secondary side heat medium and the path was separated via a heat exchanger for exchanging heat source of the exhaust heat hot water heat exchanger according to claim 2, wherein the vapor Discharge system. The waste heat utilization device, any of claims 1 to 3 is a heat-up type absorbent hot and cold water dispenser that utilizes by the heat of the heat medium flowing through the heat medium passage for diluent and indirect heat exchange of the absorbent A steam exhaust system according to crab .