JPS5886303A - Heat exchanger type condensation heat recovery device - 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 (Subject of the Invention) The present invention relates to an apparatus for disposing a heat exchanger in a water supply pipe leading from a water supply pump to a boiler to transfer heat of discharged condensate to the supply water and recovering it to the boiler.

(Prior Art) Japanese Patent Application No. 55-189178 proposes a condensate recovery device having the following structure. A heat exchanger will be installed in the water supply piping from the water pump to the boiler. Condensate is introduced into the heat exchanger to heat the feed water. Detects the amount of water in the boiler and controls the operation of the water pump.

The above device has the following problems. This device is used for small boilers and supplies water to the boiler intermittently through the water supply piping. When the feed water pump is stopped, the feed water boiling in the heat exchanger is heated by the condensate flowing through the heat exchanger, and its temperature gradually rises. As a result, the amount of heat transferred to the water supply gradually decreases, so that high-temperature condensate may be discharged to the outside, causing a strong tide. . In particular, if steam is leaking from steam 1 to lap, the level of discharged condensate will rise rapidly, and the steam will rise extremely violently, potentially damaging the surrounding environment.

(Technical Problem) The present invention is a system in which a heat exchanger is placed in the water supply piping from the water supply pump to the boiler to transfer the heat of discharged condensate to the supply water and recover it in the boiler. The purpose is to make the water supply available for other uses.

(Configuration 1) The first configuration of the present invention is as follows. A heat exchanger is arranged in the water supply piping from the water supply pump to the boiler. Condensate generated in steam-using equipment etc. The feed water is heated and discharged to the outside through the condensate discharge pipe.An electrically operated three-way switching valve is installed in the section of the water supply pipe from the heat exchanger to the boiler, and the water is heated by the hot water supply pipe. Branch the branch piping leading to the usage point.According to the water level detection means installed in the boiler, operate the water supply pump and switch the three-way switching valve to the boiler side to supply water to the boiler.Condensate discharge piping A means for detecting the temperature of condensate discharged from the heat exchanger is arranged at
When the water supply to the boiler is stopped and the discharge condensate temperature is higher than a predetermined value, the water supply pump is operated and the three-way switching valve is switched to the branch piping side to supply water to other temperature water usage locations.

The effects of the present invention are as follows. When the water supply to the boiler is stopped, the water remaining in the heat exchanger is heated by condensate, and its temperature gradually rises by -F. Therefore, since the amount of heat transferred to the feed water in the heat exchanger gradually decreases, the temperature of the condensate discharged from the heat exchanger through the condensate discharge pipe gradually increases.

At this time, when the temperature of the discharged condensate is detected by the temperature detection means and becomes higher than a predetermined value, the water supply pump is operated and the three-way switching valve is switched to the branch piping side to supply water to other hot water usage locations. . Therefore, the surplus heated water supply in the heat exchanger when the water supply is stopped can be used for other purposes.

Further, the temperature of the condensate discharged from the condensate discharge passage does not exceed a predetermined value, and steam does not rise violently outside.

5- (Configuration 2) The second configuration of the present invention is as follows. A heat exchanger is placed in the water supply piping from the water supply pump to the boiler. Condensate generated in steam-using equipment, etc. is led to a heat exchanger through a condensate flow pipe, where the feed water is heated and discharged to the outside through a condensate discharge pipe. An electrically operated three-way switching valve is placed in the section of the water supply piping from the heat exchanger to the boiler to guide the supply water to other locations that use drought conditions (branch piping). and switch the three-way switching valve to the boiler side to supply water to the boiler.Install a throttle valve on the branch pipe.The water level detection means installed in the boiler detects when the water supply to the boiler is stopped. The water supply pump is operated, the three-way switching valve is switched to the branch piping side, and water is supplied to other temperature water usage points one by one through the throttle valve in a predetermined path.

The effects of the present invention are as follows. When the water supply to the boiler is stopped, the three-way switching valve is switched to the branch piping side.

A throttle valve is arranged in the branch piping, and the water that has passed through the heat exchanger from the water supply pump is supplied in predetermined m increments to other drought utilization points. Therefore, the surplus heated water supply in the heat exchanger when the water supply is stopped can be used for other purposes. Further, since the temperature of the condensate discharged from the condensate discharge passage does not become high, there is no steam.

(Example 1) The example shown in FIGS. 1 and 2 will be explained. In FIG. 1, a heat exchanger 4 is arranged in a water supply pipe 3 extending from a water supply pump 1 to a boiler 2. Condensate discharged from the steam 1 to lap 7 is introduced into a heat exchanger 4 through a condensate flow passage 5 to heat the feed water, and is discharged to the outside through a condensate discharge passage 6. The steam trap 7 is attached to the outlet of the steam-using equipment 8. Steam is supplied to this equipment 8 from the boiler 2 through the steam piping 9. An electrically operated three-way switching valve 10 is arranged to branch a branch pipe 12 that leads the supplied water to another temperature water usage point 11.The water level in the boiler 2 is detected by a water level detection means 13. A back pressure regulating valve 14 is provided that opens when the pressure on the inlet 1 side exceeds a set value.Condensate discharge passage 6
A similar back pressure regulating valve 15 is also arranged in the heat exchanger 4 to regulate the pressure and temperature of the condensate flowing inside the heat exchanger 4. Further, a temperature detecting means 16 for detecting the temperature of condensate is arranged in a portion of the double water discharge pipe 6 from the heat exchanger 4 to the back pressure regulating valve 15. 17 is an electric motor that drives the water supply pump 1, 18 is a water supply source, and 19 is a check valve that prevents backflow of the water supply. three-way switching valve 10,
The water level detection means 13, temperature detection means 16 and electric motor 17 are connected as shown in FIG.

In FIG. 2, vx is a relay that opens and closes the contact VS of the three-way switching valve 10. The three-way switching valve 10 switches to the boiler 2 side when the contact vS is closed, and switches to the branch pipe 12 side when the contact vS is open.

MX is a relay that opens and closes the contact MS of the electric motor 17.

The relay LX closes the contact LS until the water level in the boiler 2 rises from a predetermined low water level to a predetermined low water level, and opens the contact LS until the water level drops and reaches the predetermined low water level. Relay T
X is m of condensate. When I & reaches a certain temperature or higher, contact TS
Close and open below the specified temperature. A-F are terminals connected to a power source.

The operation of the above embodiment is as follows. When the water level in the boiler 2 falls and reaches a predetermined low water level, the relay 1-x of the water level detection means 13 is energized, so the contact LS is closed, and the relays VX and MX are energized (=j, so the contact VS and MS are closed. Therefore, the three-way switching valve 10 is switched to the boiler 2 side, and the electric motor 17 drives the water supply pump 1, so that the water passes through the water supply pump 1, the water supply passage 3, and the heat exchanger 4 to the boiler. Since the high-temperature water heated by condensation in the heat exchanger 4 is sent, the amount of heat required for evaporation in the boiler 2 is reduced. When the water level reaches the relay 1 of the water level detection means 13
- Since x is deenergized, contact 18 opens and relay VXX
Deactivate MX. Since the contact point VS is opened, the three-way switching valve 10 is switched to the branch pipe 12 side, and since the contact point MS is opened, the electric motor 17 is stopped. The feed water accumulated in the heat exchanger 4 is heated by the condensate and its temperature gradually rises, so the amount of heat transferred to the feed water decreases, and the temperature of the condensate discharged from the condensate discharge passage 6 gradually rises. do. When the temperature of the discharged condensate exceeds a predetermined value, the temperature detection means 16 energizes the relay TX to close the contact TS, energizes the relay MX' to close the contact MS, and the electric motor 1
Drive 7. The water accumulated in the heat exchanger 4 is supplied to other hot water usage points 11 through a branch pipe 12 by operation of the water supply pump 1. When the temperature of the condensate flowing through the condensate discharge pipe 6 falls below a predetermined value, the electric motor 17 is stopped, and water supply to other temperature water usage points 11 is stopped.

In addition, when the water level in the boiler 2 falls to a predetermined low water level due to the use of steam, the three-way switching valve 1o is switched to the boiler 2 side, the electric motor 17 is operated to drive the feed water pump 1, and the water to the boiler 2 is switched to the boiler 2 side. The water supply is started.The same operation is repeated thereafter.Therefore, when the water supply to the boiler 2 is stopped, the surplus heated water supply in the heat exchanger 4 can be used at other drought utilization points 11.In addition, the condensate discharge The concentration of condensate discharged from the passage 613 does not rise above a predetermined -10- value, and steam does not rise violently outside.

This embodiment has the following weight effect. The back pressure regulating valve 15 disposed in the condensate discharge passage 6 does not open unless the pressure of the fluid on the first side exceeds the set value, so the pressure of the condensate flowing in the heat exchanger 4 does not reach this set value. -kl rise 1), the temperature of the condensate can be raised to the saturation temperature corresponding to this set value. Therefore, the temperature difference between the condensate and the feed water is increased in the heat exchanger 4, a large amount of heat is transferred to the feed water, and the feed water is i! ii
It can be heated to l temperature.

The back pressure regulating valve 14, like the above-mentioned valve 15, increases the pressure of the feed water to which heat is transferred from the condensate in the heat exchanger 4 to a set value, so that the feed water can reach a high temperature corresponding to this set value. ni J
Ru. Therefore, a large amount of heat can be transferred from the condensate to the feed water, and high temperature feed water can be supplied to other hot water usage points 11.

(Example 2) The example shown in FIGS. 3 and 4 will be described. However, the same reference numerals are given to the same parts as those in the embodiment shown in FIGS. 1 and 2, and the explanation thereof will be omitted. A throttle valve 31 is provided in the branch pipe 12 to restrict the flow rate of water flowing therethrough.The operation of this embodiment will be explained with reference to the wiring diagram in FIG. The electric motor 1117 is always operated and drives the water supply pump 1. When the water level in the boiler 2 decreases and reaches a predetermined low water level, the relay IX of the water level detection means 13 is energized to close the contact LS, and the relay VX is energized to close the contact VS. Therefore, the three-way switching valve 10 is switched to the boiler 2 side, and the water is supplied to the boiler 2 through the water supply pump 1, the water supply passage 3, and the heat exchanger 4. The heat of condensate is transferred to this supplied water in the heat exchanger 4, and the temperature is high, so that the amount of heat required for evaporation in the boiler 2 can be reduced.

When the water level in the boiler 2 rises to a predetermined high water level due to water supply, the relay LX of the water level detection means 13 is deenergized to open the contact LS, and the relay Vx is deenergized to open the contact VS, so the three-way switching valve 10 is activated. The water supply in the heat exchanger 4 is switched to the branch pipe 12 side, and the water supplied in the heat exchanger 4 passes through the branch pipe 12 and the comparison valve 31, and is supplied to other hot water usage points 11 in predetermined portions. When the water level in the boiler 2 decreases and reaches a predetermined low water level, the three-way switching valve 10 switches to the boiler 2 side and starts supplying water to the boiler 2.

Thereafter, the same operation is repeated. In this embodiment, when the water supply to the boiler 2 is stopped, the surplus heated water supply in the heat exchanger 4 can be used at other hot water usage points 11. In addition, the temperature of the condensate discharged from the condensate discharge passage 6 does not rise because it continues to exchange heat with the water supply that flows in a predetermined amount at a time through the heat exchanger 4, and steam may rise violently outside. .

This embodiment has the following unique effects. Water pump 1
operates all the time, and there is no need to control the operation of the pump 1 based on the temperature of the condensate flowing through the discharge passage 6. Therefore, a means for detecting the temperature of the condensate in the condensate discharge passage 6 can be eliminated. Electrical circuits can be easily constructed.

(Specific Effects) The present invention has the following specific effects. Condensate water discharged from steam generators, etc. is contaminated with rust and chemicals such as cleaning agents. The present invention utilizes feed water heated to a high temperature by heat exchange with this condensed water, and this feed water is pure without the above-mentioned contaminants and can be used directly as washing water, for example.

Heat is transferred from the condensate in the heat exchanger and the high-temperature feed water is sent to the boiler feed water. Therefore, the amount of heat required for evaporation in the boiler is reduced, the amount of fuel used in the boiler is reduced, and fuel costs are reduced.

Since the water supplied to other preparation water usage points is pressurized by the water supply pump, it can be sent to usage points in remote or high places where the pressure is high, increasing the range of use.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a heat exchanger type condensate heat recovery device according to an embodiment of the present invention, Fig. 2 is a circuit diagram showing an example of the electric circuit of the embodiment of Fig. 1, and Fig. 3 is a diagram of another embodiment. FIG. 4 is a schematic diagram of the heat exchanger type condensate heat recovery device of the example, and FIG. 4 is a circuit diagram showing an example of the electric circuit of the embodiment of FIG. 3. 14- 1: Water supply pump 2: Boiler 33: Water supply piping
4: Heat exchanger 5: Double water flow pipe 6: Condensate single outlet pipe 10: Electrically operated three-way switching valve 11: Other hot water usage points 12: Branch pipe 13: Water level detection means 1
4.15: Back pressure adjustment valve 16: Temperature detection means 1
7: Electric motor 31: Throttle valve. Patent applicant 15- Bow 41Σ Procedural amendment (method) % formula % 2. Name of the invention Heat exchanger type condensate heat recovery device 3. Person making the amendment 4. Case and relationship Patent applicant address 2 Uchisaiwai-cho, Chiyoda-ku, Tokyo Chome 2-3 Hibiya Kokusai Building 8 @ 810 Ward 1-4, Date of amendment order March 5, 1980 5, Subject of amendment (1) Financial side of application (2) Financial side of specification 6, Amendment Contents (1) Engraving of the application (no change in content) 2) Engraving of the specification (no change in content) 7. List of attached documents (1) Engrave the original and one copy of the application (2) Engrave the IC details Yu 1st procedure amendment 1, case indication patent TL! (No. 56-186162 No. 2, Name of the invention: Heat exchanger type condensate heat recovery device 3, Relation to the Ann incident to be amended Patent applicant: Jodakuchi 1y Ginkgo Address: Hibya, 2-2-3 Uchisaiwai-cho, Chiyoda-ku, Tokyo ■】
Kurii Hibiya Kokusai Pill 8th floor 810 Ward name Chiinil Buoy Co., Ltd. 4, details of the invention in the specification subject to amendment! (1) Text from page 7, line 6 of the specification to page 11, line 2 is corrected as below. (Embodiment 1) The embodiment shown in FIG. 1.2 will be described. In FIG. 1, a heat exchanger 4 is arranged in a water supply pipe 3 extending from a water supply pump 1 to a boiler 2. The condensate discharged from the steam 1 to lap 77') 1 is introduced into the heat exchanger 4 through the condensate flow passage 5 to heat the feed water, and is discharged to the outside through the condensate discharge passage 6. The steam trap 7 is installed at the outlet of the steam using equipment 8 (1
kJru. Steam is supplied to this device 8 from the boiler 2 through a steam pipe 9. A check valve 10B is arranged in the water supply pipe 3 from the heat exchanger 4 to the boiler 2, and a branch pipe 12 that leads the water supply to another drought utilization point 11 is branched from this side, and an electrically operated on-off valve 10Δ is installed. I can make an arrangement. The water level in the boiler 2 is detected by a water level detection stage 13. A back pressure regulating valve 14 is disposed in the branch pipe 12 and opens when the inlet side pressure exceeds a set value = 2-. A similar back pressure regulating valve 15 is also arranged in the condensate discharge passage 6 to regulate the pressure and temperature of the condensate flowing in the heat exchanger 4. Also, from the heat exchanger 4 of the condensate discharge pipe 6 to the back pressure regulating valve 15
Temperature detection means 16 for detecting the temperature of condensate is provided at the portion leading to
Place. Reference numeral 17 indicates an electric machine that drives the water supply pump 1, 1B indicates a water supply source, and 19 indicates a check valve that prevents backflow of the supply water. The electrically operated valve 10A, the water level detection means 13, the temperature detection means 16, and the electric motor 17 are connected as shown in FIG. In FIG. 2, vx is a relay that opens and closes contact vS of electrically operated valve 10Δ. In addition, the electrically operated valve 10A has a contact point V.
It closes when S is closed, and opens when contact vS is open. MX is a relay that opens and closes the contact MS of the electric ll117. Relay LX closes contacts LSI and LS2 until the water level in pump 2 reaches a predetermined low water level from a predetermined low water level, and opens contacts LS1 and LS2 until the water level drops and reaches a predetermined low water level. Relay TX closes contact TS when the temperature of condensate exceeds a predetermined temperature, and opens when the temperature drops below a predetermined temperature. Go to 8. [3 is the terminal that connects to the power supply. The operation of the above embodiment is as follows. When the water level in the boiler 2 falls and reaches a predetermined low water level, the relay LXB of the water level detection means 13 is energized, so that the contacts LS1. LS24 [
L;, IJ L/ -V X , M X h (j=t
lj'J'C'' setting VS, MS is closed. Therefore, the electrically operated valve 10A is closed and the water supply pump 1 is driven by the electric motor 17, so water is supplied to the water supply pump 1 and the water supply passage 3.
, is sent to the boiler 2 through the heat exchanger 4 and check valve 10B. Since high-temperature water heated by condensate in the heat exchanger 4 is sent, the amount of heat required for evaporation in the boiler 2 is reduced. When the water level in the boiler 2 rises due to water supply and reaches a predetermined high water level, the relay LX of the water level detection means 13 is deenergized, contacts LSI and LS2 are opened, and relays VX and MX are deenergized. Since contact VS opens, electrically operated valve 10△ listens,
Since the contact MS is opened, the electric motor 17 is stopped. The feed water accumulated in the heat exchanger 4 is heated and its temperature gradually rises, so the amount of heat transferred to the feed water decreases, and the temperature of the condensate discharged from the condensate IJF outlet passage 6 decreases. gradually increases.When the concentration of discharged condensate exceeds a predetermined level, the temperature detection means 16 energizes the relay TX and closes the contact T.
S is closed, relay MX is energized, contact MS is closed, and electric motor 17 is operated. The feed water accumulated in the heat exchanger 4 is supplied to other hot water usage points 11 through the branch pipe 12 because the pressure of the boiler 2 is applied to the check valve 10B by the operation of the water feed pump 1. When the temperature of the condensate flowing through the condensate discharge pipe 6 falls below a predetermined value, the electric motor 1117 stops and other temperature water usage points 1
The water supply to 1 will be cut off. In addition, by using steam, boiler 2
When the water level within the valve falls to a predetermined low water level, the electrically operated valve 10
A is closed, and the electric motor 17 operates to drive the water supply pump 1 and start supplying water to the boiler 2. The same operation is repeated thereafter. Therefore, when the water supply to the boiler 2 is stopped, surplus heated water in the heat exchanger 4 can be used at other hot water usage points 11. Further, the temperature of the condensate discharged from the condensate discharge passage 6 does not rise above a predetermined value, and steam does not rise violently outside. (2) Statement box page 13, No. 16? j's "Electrical circuit"
Correct it to "electrical circuit". (3) Add "10A: Electrically operated on-off valve 10B: Check valve" after No. 311 on page 15 of the specification. (4) "Back pressure adjustment valve" in lines 5h to 6 of page 15 of the specification is corrected to "back pressure adjustment valve." (5) Figures 1 and 2 of the drawings will be corrected according to the corrected drawings in Attachment A.1. 6. List of documents (1) Drawings (Fig. 1, Fig. 2) 1 copy 61

Claims (2)

[Claims] (1) A heat exchanger is placed in the water supply piping from the water supply pump to the boiler, and condensate generated in steam-using equipment is guided to the heat exchanger through the condensate flow pipe to heat the supply water, and then passed through the condensate discharge piping. Water is discharged to the outside, and an electrically operated three-way switching valve is installed in the section of the water supply piping from the heat exchanger to the boiler, and a branch piping that leads the water supply to other drought usage points is branched, and a water level detection means is installed in the boiler. Operate the water pump by
Switch the three-way switching valve to the boiler side to supply water to the boiler, place a means to detect the temperature of condensate discharged from the heat exchanger in the condensate discharge piping, etc., and use the discharge condensate temperature detection means to supply water to the boiler. When the water supply is stopped and the discharge condensate temperature is higher than a predetermined value, the water supply pump is operated, and the three-way switching valve is switched to the side of the branch pipe to supply water to other locations using drought water. Features a heat exchanger type condensate heat recovery device. (2) A heat exchanger is placed in the water supply piping from the water supply pump to the boiler, and the condensate generated in steam-using equipment is guided to the heat exchanger through the condensate flow pipe to heat the supply water and connect the condensate discharge piping. An electrically operated three-way switching valve is installed in the section from the water supply piping to the boiler, and a branch piping that leads the supply water to other hot water usage points is branched, and a throttle valve is placed in the branch piping to When the water supply to the boiler is stopped, the water supply pump is operated by the water level detection means installed in the boiler, and the three-way switching valve is switched to the branch piping side to supply a predetermined amount of water to other hot water usage points through the throttle valve. Features a heat exchanger type condensate heat recovery device.