CN211372373U - Boiler blow-down water utilization system - Google Patents

Abstract

The utility model discloses a boiler blow-down water utilizes system, include: a continuous blowdown flash tank having a first input end and at least two first output ends, the first input end being connected to the boiler blowdown water conduit, one first output end for outputting first blowdown water; the periodic sewage discharge flash tank is provided with a second input end and at least two second output ends, the second input end is connected with the first output end of the first sewage through a main pipeline, and one second output end is used for outputting second sewage; a bypass line arranged in parallel with the main line; the stop valve assembly is arranged between a first output end and a second input end for outputting first sewage, and the at least one heat exchange unit is connected with the bypass pipeline. The heat exchange unit in the application can improve the utilization rate of low-grade heat of the sewage and realize the cascade utilization of energy by recovering the heat of the sewage; meanwhile, the consumption of energy in the post-treatment of the second sewage is reduced, so that resources are saved.

Description

Boiler blow-down water utilization system

Technical Field

The utility model relates to a blowdown water treatment technical field especially relates to a boiler blow-down water utilizes system.

Background

In the prior art, most of the sewage heat discharged by the continuous discharge system of the gas boiler of the steel plant is not recovered, as shown in fig. 1, the continuous discharge system of the boiler is commonly used, the steam flashed out from the top of the continuous discharge capacity expander 1 ' is connected to the deaerator 2 ' for recovery, the high-temperature hot water discharged from the bottom of the continuous discharge capacity expander 1 ' is connected to the periodic discharge capacity expander 3 ', is discharged to the discharge cooling tank 4 ' after being expanded by the periodic discharge capacity expander 3 ', and is sent to the water treatment system for recycling after being cooled by the process water in the discharge cooling tank 4 '. The boiler continuous exhaust system has the following problems:

1. the heat of the high-temperature hot water discharged from the bottom of the continuous blowdown flash tank 1' is not recovered;

2. when the high-temperature hot water in the continuous blowdown flash tank 1 'is discharged to the periodic blowdown flash tank 3', part of steam is flashed again to be discharged, so that white pollution is increased, and water loss is caused;

3. the hot water at the bottom of the periodic blowdown flash tank 3 'is discharged to the blowdown cooling tank 4', and an external water pump is needed to convey a part of industrial water for cooling, so that water loss and energy waste are caused.

Aiming at the problems of the boiler continuous exhaust system, the continuous exhaust waste heat recovery technology adopted at present is that continuous exhaust water of a continuous blowdown flash tank 1' is used for indirectly heating flue gas subjected to wet desulphurization; and the continuous drainage of the continuous blowdown flash tank 1' is used for indirectly heating the boiler for water supplement and the like. However, the above solutions all use the continuous heat rejection quantity inside the boiler system, and since the continuous heat rejection quantity is small compared to the whole boiler system, the use of the continuous heat rejection quantity inside the boiler system increases the complexity of the boiler system.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a boiler blow-off water utilizes system solves the waste heat problem of recycling of boiler blow-off water, avoids the energy extravagant.

The above object of the present invention can be achieved by the following technical solutions:

the utility model provides a boiler blow-down water utilizes system, include: the continuous blowdown flash tank is provided with a first input end and at least two first output ends, the first input end is connected with a boiler blowdown water pipeline, one first output end is used for outputting first sewage, and the other first output end is used for outputting first steam; the periodic blowdown flash tank is provided with a second input end and at least two second output ends, the second input end is connected with the first output end used for outputting the first sewage through a main pipeline, one second output end is used for outputting second sewage, and the other second output end is used for outputting second steam; the bypass pipeline is connected with the main pipeline in parallel, one end of the bypass pipeline is connected with the first output end used for outputting the first sewage, and the other end of the bypass pipeline is connected with the second input end; a shut-off valve assembly disposed between the first output end and the second input end for outputting the first sewage, the shut-off valve assembly being used to open the bypass pipeline and shut off the main pipeline, or the shut-off valve assembly being used to open the main pipeline and shut off the bypass pipeline; and at least one heat exchange unit, wherein the heat exchange working medium flowing through the heat exchange unit can exchange heat with the first sewage flowing through the bypass pipeline.

Preferably, the heat exchange unit exchanges heat with the first sewage in an indirect heat exchange mode.

Preferably, the bypass pipeline comprises a first bypass pipeline, one end of the first bypass pipeline is connected with the first output end for outputting the first sewage, and the other end of the first bypass pipeline is connected with the second input end; the heat exchange unit comprises a first heat exchange unit, and the first heat exchange unit is connected with the first bypass pipeline.

Preferably, the bypass pipeline further comprises a second bypass pipeline connected in parallel with the first bypass pipeline, one end of the second bypass pipeline is connected to the first output end for outputting the first sewage, and the other end of the second bypass pipeline is connected to the second input end; the heat exchange unit further comprises a second heat exchange unit, and the second heat exchange unit is connected with the second bypass pipeline.

Preferably, the shut-off valve assembly comprises: a first shut-off valve disposed in the main pipeline; a second shut-off valve disposed in the first bypass line; and a third shut-off valve disposed in the second bypass line.

Preferably, the first heat exchange unit comprises: the heat exchanger comprises a first circulating pump and a first heat exchanger, wherein the first heat exchanger is provided with a water inlet and a water outlet, and the first circulating pump is connected with the water inlet; the first heat exchanger is connected to the outer wall of the first bypass pipeline.

Preferably, the second heat exchange unit comprises: the water tank is provided with a cold water outlet, a hot water outlet and a hot water inlet; the second heat exchanger is connected to the outer wall of the second bypass pipeline and is provided with a water inlet and a water outlet; a second circulation pump connected between the cold water outlet and the water inlet; and the third circulating pump is connected to the hot water outlet.

Preferably, the heat exchange unit comprises a heat exchanger, the heat exchanger is provided with a heat exchange channel and a working medium channel, the heat exchange channel is used for communicating with the bypass pipeline, and the heat exchange working medium flowing through the working medium channel can exchange heat with the first sewage flowing through the bypass pipeline in the heat exchange channel.

Preferably, the boiler blow-down water utilizing system further comprises: an evacuation conduit connected to the second output for outputting the second steam.

Preferably, the boiler blow-down water utilizing system further comprises: the deaerator is connected with the first output end used for outputting the first steam; and the cooling tank is connected with the second output end which is used for outputting the second sewage, and the cooling tank is connected with an industrial cooling water injection pipeline and a steam discharge pipeline.

Preferably, the boiler blow-down water utilizing system further comprises: at least one first flow regulating valve disposed in the main or bypass line; and/or at least one second flow regulating valve, wherein the second flow regulating valve is arranged in the at least one heat exchange unit.

The utility model discloses a characteristics and advantage are:

(1) the low-grade waste heat of the boiler sewage is used for heating and/or bathing, so that the gradient utilization of energy is realized, the heat energy utilization rate of the boiler is improved, and the cost is reduced and the efficiency is improved.

(2) The exhaust port steam emission of the periodical blowdown flash tank and the blowdown cooling pool is reduced, the white smoke emission phenomenon is reduced, and the safety of equipment is improved.

(3) The consumption of industrial water for cooling and the energy consumption for conveying of the pollution discharge cooling pool are reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a block diagram of a prior art boiler cascade system;

FIG. 2 is a structural diagram of a first embodiment of a boiler blow-down water utilization system of the present invention;

FIG. 3 is a structural diagram of a boiler blow-down water utilization system of the present invention;

FIG. 4 is a structural diagram of a boiler blow-down water utilization system of the present invention;

FIG. 5 is a structural diagram of a boiler blow-down water utilization system of the present invention;

FIG. 6 is a structural diagram of a boiler blow-down water utilizing system according to a second embodiment of the present invention;

FIG. 7 is a structural diagram of a boiler blow-down water utilization system of the present invention;

FIG. 8 is a structural diagram of a boiler blow-down water utilization system of the present invention;

FIG. 9 is a structural diagram of a boiler blow-down water utilization system of the present invention;

FIG. 10 is a structural diagram of a boiler blow-down water utilization system according to the present invention;

fig. 11 is a partial structural view of the first heat exchanger and/or the second heat exchanger of the present invention;

fig. 12 is another partial structural view of the first heat exchanger and/or the second heat exchanger according to the present invention.

Description of reference numerals:

10. a boiler blow down conduit; 100. A continuous blowdown flash tank;

110. a first input terminal; 120. A first output terminal;

200. a periodic blowdown flash tank; 210. A second input terminal;

220. a second output terminal; 300. A main pipeline;

400. a bypass line; 410. A first bypass line;

420. a second bypass line; 500. A shut-off valve assembly;

510. a first shut-off valve; 520. A second shut-off valve;

530. a third shut-off valve; 540. A first three-way valve;

550. a second three-way valve; 560. A pipeline shut-off valve;

600. a heat exchange unit; 610. A first heat exchange unit;

611. a first circulation pump; 612. A first heat exchanger;

6120. a water inlet; 6121. A water outlet;

613. a cold water inlet pipe; 614. hot water outlet pipeline

620. A second heat exchange unit; 621. A water tank;

6210. a cold water outlet; 6211. A hot water outlet;

6212. a hot water inlet; 6213. A hot water recovery port;

622. a second heat exchanger; 6220. A water inlet;

6221. a water discharge outlet; 623. A second circulation pump;

624. a third circulation pump; 630. A working medium channel;

640. a heat exchange channel; 700. Emptying the pipeline;

800. a deaerator; 900. A cooling pool;

910. injecting industrial cooling water into the pipeline; 920. A steam discharge conduit;

1000. a first flow regulating valve; 2000. A second flow regulating valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a boiler blow-off water utilizes system please refer to fig. 2 to fig. 10, including continuous blowdown flash tank 100, periodic blowdown flash tank 200, bypass line 400, trip valve subassembly 500 and at least one heat transfer unit 600.

Wherein the continuous blowdown flash tank 100 has a first input terminal 110 and at least two first output terminals 120, the first input terminal 110 is connected to the boiler blowdown water pipe 10, one of the first output terminals 120 is for outputting first blowdown water, and the other first output terminal 120 is for outputting first steam; the periodic blowdown flash tank 200 has a second input 210 and at least two second outputs 220, the second input 210 is connected to the first output 120 for outputting the first wastewater through a main pipeline 300, one of the second outputs 220 is for outputting the second wastewater, and the other second output 220 is for outputting the second steam; a bypass pipeline 400, wherein the bypass pipeline 400 is connected in parallel with the main pipeline 300, one end of the bypass pipeline 400 is connected with the first output end 120 for outputting the first sewage, and the other end of the bypass pipeline 400 is connected with the second input end 210; a shut-off valve assembly 500 is disposed between the first output end 120 and the second input end 210 for outputting the first sewage, the shut-off valve assembly 500 is used to open the bypass line 400 and shut off the main line 300, or the shut-off valve assembly 500 is used to open the main line 300 and shut off the bypass line 400; the heat exchange unit 600 is connected in the bypass line 400.

It will be appreciated by those skilled in the art that in some embodiments where bypass circuit 400 includes only one circuit, shut-off valve assembly 500 may be used to open main circuit 300 to shut off bypass circuit 400 or shut-off valve assembly 500 may be used to shut off main circuit 300 to open bypass circuit 400. In some embodiments, when bypass conduit 400 includes multiple conduits, shut-off valve assembly 500 is used to open main conduit 300 to shut off all of the conduits of bypass conduit 400 or shut-off valve assembly 500 is used to shut off main conduit 300 to open at least one of the conduits of bypass conduit 400.

The heat exchange unit 600 in the boiler blow-down water utilization system provided by the utility model can improve the utilization rate of low-grade heat in the blow-down water and realize the cascade utilization of energy by recovering the heat of the blow-down water; meanwhile, the consumption of energy in the post-treatment of the second sewage is reduced, so that resources are saved.

It will be understood by those skilled in the art that heat exchange unit 600 has a heat exchanger therein. In some embodiments, the heat exchange unit 600 exchanges heat with the first wastewater in a direct heat exchange manner. In other embodiments, the heat exchange between the heat exchange unit 600 and the first sewage is indirect, and a specific heat exchanger is a plate heat exchanger. In addition, it should also be understood by those skilled in the art that the connection of heat exchange unit 600 in bypass conduit 400 means that in some embodiments the heat exchanger of heat exchange unit 600 has a structure that can communicate with bypass conduit 400, and in other embodiments the heat exchanger of heat exchange unit 600 is disposed directly on the peripheral wall of the bypass conduit without contacting the working medium of bypass conduit 400.

FIG. 2 is a first embodiment of the utility model relates to a boiler blow-down water utilizes system's structure chart, and boiler blow-down water utilizes system includes: continuous blowdown flash tank 100, periodic blowdown flash tank 200, a main line 300, a first bypass line 410 (in this embodiment, bypass line 400 includes a first bypass line 410), shut-off valve assembly 500 and a heat exchange unit 600.

Specifically, referring to fig. 2, the continuous blowdown flash tank 100 has a first input terminal 110 and two first output terminals 120, the first input terminal 110 is connected to the boiler blowdown water pipe 10, one of the first output terminals 120 is for outputting first blowdown water, and the other first output terminal 120 is for outputting first steam; the periodic blowdown flash tank 200 has a second input 210 and at least two second outputs 220, the second input 210 is connected to the first output 120 for outputting the first wastewater through a main pipeline 300, one of the second outputs 220 is for outputting the second wastewater, and the other second output 220 is for outputting the second steam; the first bypass pipeline 410 is connected in parallel with the main pipeline 300, one end of the first bypass pipeline 410 is connected with the first output end 120 for outputting the first sewage, and the other end of the first bypass pipeline 410 is connected with the second input end 210; a shut-off valve assembly 500 is provided between the first output 120 and the second input 210 for outputting the first sewage, the shut-off valve assembly 500 is used to open the first bypass line 410 and shut off the main line 300, or the shut-off valve assembly 500 is used to open the main line 300 and shut off the first bypass line 410; heat exchange unit 600 is connected to first bypass line 410.

The utility model provides a pair of boiler blow-off water utilizes system only needs to connect a first bypass pipeline 410 and a main line 300 in parallel, just can realize the function of heat transfer through trip valve subassembly 500 when needs carry out the heat transfer, when need not carrying out the heat transfer, can directly arrange the heat of blow off water toward periodic blowdown flash tank 200 according to the user's demand. Therefore, the heat exchange is more flexible in the aspect of heat exchange, so that the heat exchange can be carried out according to the requirements of users, the waste of heat energy can be avoided, and the workload increased when the heat exchange function is started without heat exchange can be avoided.

In this embodiment, referring to fig. 2, the shut valve assembly 500 includes a first shut valve 510 and a second shut valve 520. Specifically, a first shut-off valve 510 is provided in the main line 300, and a second shut-off valve 520 is provided in the first bypass line 410. This embodiment adopts two trip valves to realize opening first bypass pipeline 410 and cutting off main pipeline 300, perhaps opens main pipeline 300 and cuts off the function of first bypass pipeline 410, and simple structure, the workman's operation of being convenient for and maintenance, factor of safety are high, and the low cost of trip valve has reduced manufacturing cost simultaneously, has improved market competition.

In a further embodiment, referring to fig. 3, the shut-off valve assembly 500 comprises a first three-way valve 540, an input of the first three-way valve 540 being connected to the first output 120 for outputting the first wastewater, one output of the first three-way valve 540 being connected to the main line 300, and the other output of the first three-way valve 540 being connected to the first bypass line 410. In this embodiment, the first three-way valve 540 is adopted to realize the functions of opening the first bypass pipeline 410 and cutting off the main pipeline 300, or opening the main pipeline 300 and cutting off the first bypass pipeline 410, so that the structure is more compact, and the installation space is saved; on the other hand, the first three-way valve 540 can save manpower, so that the automation of the machine is improved, and the market competitiveness is further improved.

In this embodiment, referring to fig. 2 and fig. 3, the heat exchange unit 600 is a first heat exchange unit 610, and specifically, the first heat exchange unit 610 includes: the first circulating pump 611 and the first heat exchanger 612, the first heat exchanger 612 has a water inlet 6120 and a water outlet 6121, and the first circulating pump 611 is connected with the water inlet 6120; the first heat exchanger 612 is connected to an outer wall of the first bypass line 410. During operation, the first circulation pump 611 can convey cold water to the first heat exchanger 612 through the water inlet 6120 for heat exchange, and the cold water is heated in the first heat exchanger 612 and then flows out through the water outlet 6121 for utilization by a user. The first heat exchange unit 610 provided by the embodiment has the advantages of simple structure, convenience in installation and maintenance, low cost and high market competitiveness.

Specifically, the first heat exchange unit 610 is a heating unit, the first heat exchanger 612 is a heating water heat exchanger, the heating water heat exchanger is an indirect heat exchanger, the water inlet 6120 is connected to the cold water inlet pipe 613 and injects water into the heating water heat exchanger through the first circulation pump 611, and the cold water working medium enters the heating water heat exchanger to be heated and then outputs high-temperature heating water through the hot water outlet pipe 614. When the first heat exchange unit 610 adopts the heating unit, the requirement of the user on heating can be met when the temperature is lower, so that the additional energy consumption is avoided being increased for meeting the requirement of the user, and the utilization rate of low-grade heat of sewage is further improved. In other embodiments of the heating water heat exchanger, the heating water heat exchanger adopts a plate heat exchanger, thereby avoiding direct contact between sewage and working media in the heating water heat exchanger in a direct heat exchange mode, further avoiding the corrosion damage of the pipeline in the first heat exchange unit 610 and the structure of the first circulating pump 611, and further ensuring normal realization of heat exchange and reducing the later maintenance cost.

It should be understood by those skilled in the art that the working medium in the heating heat exchanger may be water or other liquid working medium capable of raising temperature, and of course, the working medium may also be other fluids, so long as the purpose of heat exchange can be achieved, which is within the scope of the present invention.

In another embodiment, referring to fig. 4, the heat exchange unit 600 is a second heat exchange unit 620, and specifically, the second heat exchange unit 620 includes a water tank 621, a second heat exchanger 622, a second circulation pump 623, and a third circulation pump 624. The water tank 621 has a cold water outlet 6210, a hot water outlet 6211, and a hot water inlet 6212; a second heat exchanger 622 is connected to an outer wall of the first bypass line 410, the second heat exchanger 622 having a water inlet 6220 and a water discharge port 6221; the second circulation pump 623 is connected between the cold water outlet 6210 and the water inlet 6220; the third circulation pump 624 is connected at the hot water outlet 6211.

In the second heat exchange unit 620 in this embodiment, the water tank 621 is arranged to store cold water, then the second circulation pump 623 conveys the cold water in the water tank 621 to the second heat exchanger 622 through the water inlet 6220, and the cold water is heated in the second heat exchanger 622 and then flows out of the water tank 621 through the water outlet 6221 to be stored; when the user needs to use hot water, the third circulating pump 624 delivers the hot water in the water tank 621 to the user consumption department through the hot water outlet 6211, so that the low-grade heat of the sewage can be collected and stored in the water tank 621, further avoiding the dissipation during heat consumption, and further improving the market competitiveness.

Further, referring to fig. 4, the working medium in the second heat exchanging unit 620 is water, the water tank 621 further has a hot water recycling port 6213, and the residual water of the working medium in the second heat exchanging unit 620 at the consumption position of the user flows into the water tank 621 from the hot water recycling port 6213. In actual use, when the working medium is heated and then conveyed to a user consumption part and is not completely consumed, the embodiment recovers the heat of the working medium which is not consumed into the water tank 621 through the hot water recovery port 6213, thereby avoiding the waste of heat energy; on the other hand, even if the second heat exchange unit 620 is in a shutdown state, the user can consume the thermal energy previously stored in the water tank 621, thereby ensuring that a sufficient amount of consumption can be provided for the user, and the user can obtain the thermal energy without waiting for the second heat exchanger 622 to operate for heat exchange.

Specifically, the second heat exchange unit 620 is a bathing unit, the second heat exchanger 622 is a bathing water heat exchanger, the bathing water heat exchanger is an indirect heat exchanger, cold water from the water tank 621 is pressurized by the second circulating pump 623 through a pipeline and then is sent into the bathing water heat exchanger for heating, and high-temperature hot water is output through the pipeline and returns to the water tank 621; the high-temperature bathing hot water from the water tank 621 is pressurized by the third circulating pump 624 through a pipeline and then sent to a bathing consumption place for use by a user, and the surplus hot water returns to the water tank 621 through the hot water recycling port 6213 for heat storage.

In still another embodiment, referring to fig. 5, the heat exchange unit 600 includes a first heat exchange unit 610 and a second heat exchange unit 620, and the first heat exchange unit 610 and the second heat exchange unit 620 are sequentially connected to the first bypass pipeline 410. In the heat exchange, the first sewage flows through the first bypass line 410 to be heat-exchanged with the first heat exchange unit 610 and the second heat exchange unit 620 in sequence. According to the heat exchanger, the first heat exchange unit 610 and the second heat exchange unit 620 are sequentially connected to the first bypass pipeline 410, so that sufficient heat exchange can be realized, when first sewage flows into the first bypass pipeline 410 and then exchanges heat with the first heat exchange unit 610, and at the moment, the temperature of the first sewage is reduced to a certain value; in this state, the temperature of the first sewage may be still higher, and after the second heat exchange unit 620 is additionally arranged, the first sewage may exchange heat with the second heat exchange unit 620 again, so that the temperature of the first sewage is reduced again, the temperature of the sewage flowing into the periodic sewage flash tank 200 is ensured to be in a proper range, and the amount of industrial cooling water consumed by the subsequent second sewage to be treated is finally reduced.

In some embodiments, referring to fig. 5, a second flow regulating valve 2000 is further disposed in at least one heat exchange unit 600. Because the second flow regulating valve 2000 is provided, the flow of the working medium in the heat exchange unit 600 can be regulated according to the user's demand. For example, when the first heat exchange unit 610 is a heating unit and the second heat exchange unit 620 is a bathing unit, the user may set the second flow rate adjustment valve 2000 in the heating unit and/or the bathing unit. If a user only needs to perform heating heat exchange, the flow of the working medium in the heating unit can be adjusted to 100% by using the second flow adjusting valve 2000, and the flow of the working medium in the bathing unit can be adjusted to 0%, namely, only the heating heat exchange is performed, and the bathing heat exchange is not performed, so that the user can conveniently and reasonably configure the recovered heat of the sewage. If the user only needs to perform the bathing heat exchange, the flow of the working medium in the heating unit can be adjusted to 0% by using the second flow adjusting valve 2000, and the flow of the working medium in the bathing unit can be adjusted to 100%, namely, only the bathing heat exchange is performed, and the heating heat exchange is not performed, so that the user can conveniently and reasonably configure the recovered heat of the sewage. Certainly, the user can also calculate the heat energy consumption ratio of heating and bathing according to the requirement, so that the flow of the working medium in the heating unit and/or the bathing unit is adjusted to a corresponding value by using the second flow regulating valve 2000, the heat energy consumption is further ensured to be utilized according to the requirement of the user, and the market competitiveness is increased.

It will be understood by those skilled in the art that in the embodiment where first heat exchange unit 610 and second heat exchange unit 620 are connected to first bypass line 410 in sequence, shut-off valve assembly 500 may be connected to the line in the combination of fig. 2 including first shut-off valve 510 and second shut-off valve 520, or may be connected to the line in the manner of fig. 3 including first three-way valve 540. Adopt the connected mode of two trip valves, simple structure, the workman's operation of being convenient for and maintenance, factor of safety are high, and the low cost of trip valve has reduced manufacturing cost simultaneously, has improved market competition. The connection mode of the first three-way valve 540 is adopted, so that the structure is more compact, and the installation space is saved; on the other hand, the first three-way valve 540 can save manpower, so that the automation of the machine is improved, and the market competitiveness is further improved.

FIG. 6 is a structural diagram of a second embodiment of the boiler blow-down water utilizing system of the present invention, the boiler blow-down water utilizing system includes: the system comprises a continuous blowdown flash tank 100, a periodic blowdown flash tank 200, a main pipeline 300, a first bypass pipeline 410, a second bypass pipeline 420, a shut-off valve assembly 500 and two heat exchange units 600. Wherein, in this embodiment, bypass line 400 includes a first bypass line 410 and a second bypass line 420.

Specifically, referring to fig. 6, the continuous blowdown flash tank 100 has a first input terminal 110 and two first output terminals 120, the first input terminal 110 is connected to the boiler blowdown water pipe 10, one of the first output terminals 120 is for outputting first blowdown water, and the other first output terminal 120 is for outputting first steam; the periodic blowdown flash tank 200 has a second input 210 and two second outputs 220, the second input 210 is connected to the first output 120 for outputting the first wastewater through a main pipeline 300, one of the second outputs 220 is for outputting the second wastewater, and the other second output 220 is for outputting the second steam; the first bypass pipeline 410 is connected in parallel with the main pipeline 300, one end of the first bypass pipeline 410 is connected with the first output end 120 for outputting the first sewage, and the other end of the first bypass pipeline 410 is connected with the second input end 210; the second bypass pipeline 420 is connected in parallel with the first bypass pipeline 410, one end of the second bypass pipeline 420 is connected to the first output end 120 for outputting the first sewage, and the other end of the second bypass pipeline 420 is connected to the second input end 210; a shut-off valve assembly 500 is disposed between the first output end 120 and the second input end 210 for outputting the first sewage, the shut-off valve assembly 500 is used to open at least one of the bypass lines 400 (i.e., open the first bypass line 410 and/or the second bypass line 420) and shut off the main line 300, or the shut-off valve assembly 500 is used to open the main line 300 and shut off all of the bypass lines 400 (i.e., shut off the first bypass line 410 and the second bypass line 420); two heat exchange units 600 include a first heat exchange unit 610 and a second heat exchange unit 620, the first heat exchange unit 610 being connected in the first bypass line 410, the second heat exchange unit 620 being connected in the second bypass line 420.

The utility model provides a pair of boiler blow-down water utilizes system adopts two parallelly connected modes of pipeline of main line 300 and bypass pipeline 400 to come the recovery and utilize the heat in the blowdown water. On one hand, the problem that heat cannot be fully recycled when the first heat exchange unit 610 or the second heat exchange unit 620 independently exchanges heat is solved; on the other hand, the problem that heat recovery cannot be performed timely when the first heat exchange unit 610 or the second heat exchange unit 620 is damaged is solved. Therefore, the heat of the sewage can be fully recovered, and even if one heat exchange unit 600 fails, the heat can be recovered and utilized.

In some embodiments, first heat exchange unit 610 is a heating unit and second heat exchange unit 620 is a bathing unit. The structure and operation principle of the first heat exchange unit 610 and the second heat exchange unit 620 are the same as those of the first embodiment, and are not described herein again. Under normal conditions, the shut-off valve assembly 500 closes the main pipeline 300, opens the first bypass pipeline 410 and/or the second bypass pipeline 420, and discharges sewage into the heating water heat exchanger and/or the bath water heat exchanger for heat exchange and temperature reduction and then discharges the sewage to the periodic sewage flash tank 200; when the heating water heat exchanger and/or the bath water heat exchanger are/is not in use, the shut-off valve assembly 500 opens the main pipeline 300 and closes the corresponding first bypass pipeline 410 and/or the second bypass pipeline 420, and sewage is directly discharged to the periodic sewage flash tank 200 for further treatment.

In this embodiment, referring to fig. 6, the shut-off valve assembly 500 comprises: a first shut off valve 510, a second shut off valve 520, and a third shut off valve 530. Specifically, a first shut-off valve 510 is provided in the main line 300, a second shut-off valve 520 is provided in the first bypass line 410, and a third shut-off valve 530 is provided in the second bypass line 420. In this embodiment, the three shutoff valves are used to control the on/off of the main pipeline 300, the first bypass pipeline 410 and the second bypass pipeline 420, so that a user can select a working state according to a requirement, and the heat energy recovery rate is ensured.

In this embodiment, when the first heat exchange unit 610 is a heating unit and the second heat exchange unit 620 is a bathing unit, the user may open the main pipeline 300 and cut off the first bypass pipeline 410 and the second bypass pipeline 420, and at this time, the user does not perform heat recovery on the sewage; of course, the user may also cut off the main pipeline 300 and the first bypass pipeline 410, open the second bypass pipeline 420, and then the user recovers the heat in the sewage to provide the bathing consumption; in addition, the user can cut off the main pipeline 300 and the second bypass pipeline 420, open the first bypass pipeline 410, and then recover the heat in the sewage to provide heating consumption; of course, the user may also cut off the main pipe 300 and open the first bypass pipe 410 and the second bypass pipe 420, at which time the user recovers the heat in the sewage to provide heating and bathing consumption.

In another embodiment, please refer to fig. 7, wherein the shut-off valve assembly 500 comprises a first three-way valve 540 and a second three-way valve 550, an input of the first three-way valve 540 is connected to the first output 120 for outputting the first wastewater, and an output of the first three-way valve 540 is connected to the main pipeline 300; an input of the second three-way valve 550 is connected to the other output of the first three-way valve 540, one output of the second three-way valve 550 is connected to the first bypass line 410, and the other output of the second three-way valve 550 is connected to the second bypass line 420. In this embodiment, a connection control manner of the first three-way valve 540 and the second three-way valve 550 is adopted, the on-off of the main pipeline 300 and the bypass pipeline 400 can be controlled by the first three-way valve 540, and the on-off of the first bypass pipeline 410 and the second bypass pipeline 420 is controlled by the second three-way valve 550, so that a user can conveniently select a working state according to a requirement, and further, the recycling rate of heat energy is ensured. By adopting the connection control mode, the installation workload is reduced, and the requirement of the system on the installation space is reduced.

In still another embodiment, referring to fig. 8, the shut-off valve assembly 500 includes a pipeline shut-off valve 560 and a second three-way valve 550, the pipeline shut-off valve 560 is disposed in the main pipeline 300, an input end of the second three-way valve 550 is connected to the first output end 120 for outputting the first sewage, one output end of the second three-way valve 550 is connected to the first bypass pipeline 410, and the other output end of the second three-way valve 550 is connected to the second bypass pipeline 420. By adopting the control mode, the product cost is saved; meanwhile, the maintenance cost of a later system is reduced, so that the market competitiveness of the product is increased.

In some embodiments, see fig. 9, wherein shut valve assembly 500 includes a second shut valve 520, a third shut valve 530, and a first three way valve 540. Specifically, an input end of the first three-way valve 540 is connected to the first output end 120 for outputting the first sewage, one output end of the first three-way valve 540 is connected to the main pipe 300, and the other output end of the first three-way valve 540 is connected to an input end of the bypass pipe 400; a second shut-off valve 520 is provided in the first bypass line 410 and a third shut-off valve 530 is provided in the second bypass line 420. By adopting the control mode, the safety coefficient of the system can be improved, and the phenomenon that the heat of the sewage can not be recovered due to the damage of the cut-off valve component 500 is avoided; meanwhile, even if the first heat exchange unit 610 or the second heat exchange unit 620 has problems and needs to be maintained, other heat exchange units 600 can recycle the heat of the sewage.

According to an embodiment of the present embodiment, referring to fig. 10, the heat exchange unit 600 includes two first heat exchange units 610 and one second heat exchange unit 620, specifically, one first heat exchange unit 610 is connected to the first bypass pipeline 410, and the other first heat exchange unit 610 and the second heat exchange unit 620 are sequentially connected to the second bypass pipeline 420. During heat exchange, the first sewage flows into the bypass pipeline 400 and then is divided into two paths, wherein one path flows into the first bypass pipeline 410 to exchange heat with one first heat exchange unit 610; the other path flows into the second bypass line 420, and the first sewage flows through the second bypass line 420 and exchanges heat with the other first heat exchange unit 610 and the second heat exchange unit 620 in sequence. The boiler blow-down water utilization system provided by the embodiment can ensure that the heat of blow-down water can be fully recycled; thereby ensuring that the temperature of the first sewage flowing into the periodic sewage flash tank 200 is proper, and reducing the consumption of natural resources required by the subsequent treatment of the second sewage.

According to an embodiment of the present invention, please refer to fig. 11, the heat exchanging unit 600 includes a heat exchanger, wherein the heat exchanger can be the aforementioned first heat exchanger 612 and/or the second heat exchanger 622, the first heat exchanger 612 and/or the second heat exchanger 622 only has a working medium channel 630, and the working medium channel 630 is formed by communicating a water inlet 6120 with a water outlet 6121 (or a water inlet 6220 with a water outlet 6221). The first heat exchanger 612 and/or the second heat exchanger 622 may be directly wound or overlapped on an outer wall of the bypass pipeline 400, and the first sewage exchanges heat with the working medium flowing through the working medium channel 630 when flowing through the bypass pipeline 400 and is then discharged to the periodic blowdown flash tank 200. This design can select suitable first heat exchanger 612 and/or second heat exchanger 622's model according to user's demand to the attribute parameter of adjustment working medium passageway 630, further adjustment heat transfer parameter reaches the heat transfer effect finally.

According to an embodiment of the present invention, please refer to fig. 12, the heat exchanging unit 600 includes a heat exchanger, wherein the heat exchanger can be the aforementioned first heat exchanger 612 and/or the second heat exchanger 622, the first heat exchanger 612 and/or the second heat exchanger 622 has a heat exchanging channel 640 and a working medium channel 630, the heat exchanging channel 640 is used for communicating the bypass pipeline 400, and the heat exchanging working medium flowing through the working medium channel 630 exchanges heat with the first sewage flowing through the bypass pipeline 400 in the heat exchanging channel 640. This design has heat exchange channel 640 in addition to working medium channel 630. The working medium channel 630 is formed by communicating a water inlet 6120 and a water outlet 6121 (or a water inlet 6220 and a water outlet 6221), and the heat exchange channel 640 is formed by a pipeline communicated with the bypass pipeline 400. In the design mode, the attribute parameters of the contact surfaces of the working medium channel 630 and the heat exchange channel 640 can be adjusted through different types of the first heat exchanger 612 and/or the second heat exchanger 622, the heat exchange parameters are further adjusted, and the heat exchange effect is finally achieved. Therefore, on one hand, the heat exchange channel 640 in the heat exchanger is convenient to be directly communicated with the bypass pipeline 400, and the type selection of the heat exchanger is not required according to the attribute parameters of the bypass pipeline 400, so that the design time and the construction time are shortened, and the application range is expanded; on the other hand, the structure that relates to the heat transfer function is concentrated together to promote the integrated level of structure, be convenient for later stage maintenance and change increase market competition.

According to an embodiment of the present invention, please refer to fig. 2 to 10, wherein the boiler blow-down water utilizing system further comprises: and an evacuation pipe 700, the evacuation pipe 700 being connected to the second output terminal 220 for outputting the second steam. Through setting up evacuation pipeline 700, some steam that flash once more when high temperature blowdown flash water arranges to periodic blowdown flash tank 200 expansion in continuous blowdown flash tank 100 can not directly be emptied, but discharges through evacuation pipeline 700 to white pollution has been reduced, has avoided causing the water loss simultaneously.

Referring to fig. 2 to 10, according to an embodiment of the present invention, the boiler blow-down water utilization system further includes a deaerator 800 and a cooling tank 900. Specifically, the deaerator 800 is connected to the first output end 120 for outputting the first steam, the cooling tank 900 is connected to the second output end 220 for outputting the second sewage, and the cooling tank 900 is connected to the industrial cooling water injection pipe 910 and the steam discharge pipe 920. By arranging the cooling tank 900, the industrial cooling water can be injected into the cooling tank 900 through the industrial cooling water injection pipeline 910, so that the second sewage injected into the cooling tank 900 is cooled, and further, the sewage discharged to the outside cannot pollute the environment; meanwhile, the flash steam is discharged through the steam discharge pipeline 920, so that the damage and pollution to the environment caused by overhigh steam temperature are avoided; in addition, the discharge of sewage and steam is ensured to meet relevant standards.

According to an embodiment of the present invention, please refer to fig. 2 to 10, wherein the boiler blow-down water utilizing system further comprises: at least one first flow rate adjustment valve 1000, the first flow rate adjustment valve 1000 being disposed in the main line 300 or the bypass line 400; and/or at least one second flow regulating valve 2000, the second flow regulating valve 2000 being provided in the at least one heat exchange unit 600.

In some embodiments, the first flow regulating valve 1000 is disposed in the main pipeline 300, so that a user can adjust the flow of the first sewage in the main pipeline 300 according to a requirement, and thus the heat recovery of the first sewage by the heat exchanging unit 600 in the bypass pipeline 400 is performed according to a requirement. In some embodiments, the first flow regulating valve 1000 is disposed in the bypass pipeline 400, so as to ensure that when the first sewage flows into the bypass pipeline 400, the first sewage can flow into at least one pipeline of the bypass pipeline 400 according to a flow regulating result, thereby ensuring that heat of the first sewage is recovered and utilized according to user requirements.

It will be appreciated by those skilled in the art that the purpose of providing the first flow regulating valve 1000 in the main conduit 300 and the bypass conduit 400 is to regulate the flow of the working fluid in the respective conduits, and that the first flow regulating valve 1000 may function as a shut-off valve when the flow of the first flow regulating valve 1000 is regulated to 0% and/or 100%, and thus, in some embodiments, the provision of the first flow regulating valve 1000 may achieve the same function and effect as the provision of the shut-off valve assembly 500.

In some embodiments, the boiler blow-down water utilizing system further includes at least one second flow regulating valve 2000, and the second flow regulating valve 2000 is provided in the at least one heat exchange unit 600. Therefore, the user can adjust the second flow regulating valve 2000 to a proper position according to the heat energy demand of the consumption end, thereby ensuring reasonable and effective recovery and utilization of heat energy.

It should be understood by those skilled in the art that the flow control valve is within the scope of the present invention as long as the flow control valve can achieve the purpose of regulating the flow, regardless of whether the flow control valve is configured to change the flow rate of the liquid flowing therethrough or the size of the cross section of the pipe of the flow control valve.

The above description is only for the embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.

Claims (11)

1. A boiler blow-down water utilizing system is characterized by comprising:

the continuous blowdown flash tank is provided with a first input end and at least two first output ends, the first input end is connected with a boiler blowdown water pipeline, one first output end is used for outputting first sewage, and the other first output end is used for outputting first steam;

the periodic blowdown flash tank is provided with a second input end and at least two second output ends, the second input end is connected with the first output end used for outputting the first sewage through a main pipeline, one second output end is used for outputting second sewage, and the other second output end is used for outputting second steam;

the bypass pipeline is connected with the main pipeline in parallel, one end of the bypass pipeline is connected with the first output end used for outputting the first sewage, and the other end of the bypass pipeline is connected with the second input end;

a shut-off valve assembly disposed between the first output end and the second input end for outputting the first sewage, the shut-off valve assembly being used to open the bypass pipeline and shut off the main pipeline, or the shut-off valve assembly being used to open the main pipeline and shut off the bypass pipeline; and

and the heat exchange working medium flowing through the heat exchange unit can exchange heat with the first sewage flowing through the bypass pipeline.

2. The boiler blow-down water utilizing system of claim 1, wherein the heat exchanging unit exchanges heat with the first sewage in a form of indirect heat exchange.

3. The boiler blow-down water utilizing system according to claim 1, wherein the bypass line includes a first bypass line, one end of the first bypass line is connected to the first output end for outputting the first sewage, and the other end of the first bypass line is connected to the second input end; the heat exchange unit comprises a first heat exchange unit, and the first heat exchange unit is connected with the first bypass pipeline.

4. The boiler blow-down water utilizing system according to claim 3, wherein the bypass line further comprises a second bypass line disposed in parallel with the first bypass line, one end of the second bypass line is connected to the first output end for outputting the first sewage, and the other end of the second bypass line is connected to the second input end; the heat exchange unit further comprises a second heat exchange unit, and the second heat exchange unit is connected with the second bypass pipeline.

5. The boiler blow down water utilization system of claim 4, wherein the shut-off valve assembly comprises:

a first shut-off valve disposed in the main pipeline;

a second shut-off valve disposed in the first bypass line; and

a third shut-off valve disposed in the second bypass line.

6. The boiler blow-down water utilizing system according to claim 4, wherein the first heat exchanging unit includes:

the heat exchanger comprises a first circulating pump and a first heat exchanger, wherein the first heat exchanger is provided with a water inlet and a water outlet, and the first circulating pump is connected with the water inlet; the first heat exchanger is connected to the outer wall of the first bypass pipeline.

7. The boiler blow-down water utilizing system according to claim 6, wherein the second heat exchanging unit includes:

the water tank is provided with a cold water outlet, a hot water outlet and a hot water inlet;

the second heat exchanger is connected to the outer wall of the second bypass pipeline and is provided with a water inlet and a water outlet;

a second circulation pump connected between the cold water outlet and the water inlet; and

and the third circulating pump is connected to the hot water outlet.

8. The boiler blow-down water utilization system according to claim 4, wherein the heat exchange unit comprises a heat exchanger, the heat exchanger has a heat exchange channel and a working medium channel, the heat exchange channel is used for communicating with the bypass pipeline, and the heat exchange working medium flowing through the working medium channel can exchange heat with the first sewage flowing through the bypass pipeline in the heat exchange channel.

9. The boiler blow-down water utilizing system according to claim 1, further comprising:

an evacuation conduit connected to the second output for outputting the second steam.

10. The boiler blow-down water utilizing system according to any one of claims 1 to 9, further comprising:

the deaerator is connected with the first output end used for outputting the first steam; and

the cooling pool is connected to the second output end used for outputting the second sewage, and the cooling pool is connected with an industrial cooling water injection pipeline and a steam discharge pipeline.

11. The boiler blow-down water utilizing system according to claim 10, further comprising:

at least one first flow regulating valve disposed in the main or bypass line; and/or

At least one second flow regulating valve disposed in the at least one heat exchange unit.

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