CN102607014A - Boiler water replenishing system capable of collecting waste heat and condensed water - Google Patents

Abstract

The invention discloses a boiler water supply system for collecting waste heat and condensed water. The boiler blowdown pipe of the boiler is connected to a blowdown expansion tank, and the steam outlet of the blowdown expansion tank is connected to a hot water tank through a blowdown flash steam pipe, and the blowdown of the blowdown expansion tank The water pipe is connected to the heat exchanger, and the exhaust heat exchanger is also connected to the softened water inlet pipe. The softened water inlet pipe is connected to the softening water station through the water supply pump, and the softened water outlet pipe of the exhaust heat exchanger is connected to the boiler secondary economizer before connecting The hot water tank is connected to the hot water outlet pipe, and the hot water outlet pipe is connected to the boiler water inlet after being connected to the circulation pump, the thermal deaerator and the boiler feed water pump in turn. The invention is a kind of centralized utilization of waste heat and condensed water, which not only reduces the steam consumption of the deaerator, enhances the effect of waste heat absorption, simplifies the connecting pipe of the deaerator, reduces the pollution of heat and condensed water to the environment, but also reduces the heat and condensed water pollution to the environment. The boiler water supply system that does not affect the boiler water supply when the exchange equipment fails.

Description

Boiler make-up water system for collecting waste heat and condensed water

technical field

The invention relates to the application of waste heat and condensed water in boiler replenishment water in a cigarette factory, in particular to a boiler water replenishment system for collecting waste heat and condensed water.

Background technique

The sewage and flue gas discharged from the fire tube boiler have a high temperature and contain a lot of heat. Tobacco companies' silk production equipment, combined air conditioners, heat exchangers, etc. produce a large amount of high-temperature and relatively pure condensed water and flash steam, especially the condensed water produced by silk-making equipment has a high temperature. If these waste heat and condensed water are not recycled, it will not only cause energy waste, but also pollute the environment. Although some enterprises directly recycle part of the waste heat, condensed water, flash steam, etc. to the deaerator or other places for utilization, the utilization points are scattered, not only the absorption effect is not good, but also the pipeline is more and complicated, which is not easy to control .

Contents of the invention

The purpose of the present invention is to provide a method for centralized utilization of waste heat and condensed water, which not only reduces the steam consumption of the deaerator, enhances the effect of waste heat absorption, simplifies the connection pipe of the deaerator, reduces the pollution of heat and condensed water to the environment, Moreover, the boiler water supply system that does not affect the boiler water supply when the heat exchange equipment fails.

In order to achieve the above object, the present invention adopts the following technical scheme: a boiler water replenishment system for collecting waste heat and condensed water, the boiler blowdown pipe of the boiler is connected to the blowdown expansion tank, and the steam outlet of the blowdown expansion tank is connected to a heat sink through the blowdown flash steam pipe. The water tank and the blowdown pipe of the blowdown expansion tank are connected to the heat exchanger, and the heat exchanger is also connected to the softened water inlet pipe. The softened water inlet pipe is connected to the softening water station through the water supply pump, and the softened water outlet pipe of the heat exchanger is connected to The secondary economizer of the boiler is then connected to the hot water tank, the hot water tank is connected to the hot water outlet pipe, and the hot water outlet pipe is connected to the circulation pump, thermal deaerator and boiler feed water pump in turn, and then connected to the boiler water inlet.

 It also includes a low-temperature condensate pipe connected to the combined air conditioner and/or heating equipment and/or heat exchanger. The low-temperature condensate pipe is connected to the first condensate recovery tank and the first iron removal equipment in turn, and then connected to the hot water tank.

It also includes a flash tank connected to the high-temperature condensate pipe in the workshop. The exhaust port of the flash tank is connected to the hot water tank through the condensate flash pipe. The outlet of the flash tank is connected to the high-temperature condensate pipe, which is connected to the second The condensed water recovery tank and the second iron removal equipment are then connected to the hot water tank.

After the softened water inlet pipe is connected to the water supply pump, it is also connected to the hot water tank through a bypass pipe, and a solenoid valve is arranged on the bypass pipe.

The hot water tank includes a box body, and two vertical partitions are arranged oppositely at left and right intervals in the box: a second partition and a first partition, the top of the second partition is fixedly connected with the top plate of the box body, and the top of the second partition is The two sides are fixedly connected with the two inner walls of the box, a gap is set between the bottom of the second partition and the bottom of the box, a gap is set between the top of the first partition and the top of the box, and the two sides of the first partition The side ends are fixedly connected with the two inner walls of the box body, the bottom end of the first partition is fixedly connected with the bottom plate of the box body, and the second and first partition boards divide the box body into three sub-boxes from left to right: the third sub-box box, the second sub-box and the first sub-box, the box body corresponding to the third sub-box is connected with the softened water outlet pipe and the low-temperature condensate water pipe, and the box body corresponding to the second sub-box is connected with the sewage flash steam pipe and condensate flash steam pipes, blowdown flash steam pipes and condensate flash steam pipes are all connected to the top plate of the box corresponding to the second sub-box, and the box corresponding to the first sub-box is connected to the hot water outlet pipe and high temperature Condensation pipe.

The tank corresponding to the first sub-box is provided with a liquid level sensor, and the liquid level sensor is connected to the water supply pump signal of the soft water station. The tank corresponding to the first sub-box is connected with an overflow pipe for controlling the water level of the first sub-box. The top of the first dividing plate is lower than the overflow port of the overflow pipe on the box body, and the bottoms of the second and first sub-boxes are connected with blowdown pipes with on-off valves.

The boiler is a fire-tube saturated steam boiler. The fire-tube saturated steam boiler is equipped with a first-level boiler economizer. The hot water outlet pipe enters the fire-tube saturated steam boiler from the first-level economizer of the boiler.

The first-level economizer of the boiler and the second-level economizer of the boiler are both flue gas condensers, and the heat exchanger is a continuous-exhaust heat exchanger.

The top of the second partition is provided with a through hole for connecting the third sub-box and the second sub-box.

The hot water tank is a rectangular parallelepiped stainless steel hot water tank. the

In the boiler water replenishment system for collecting waste heat and condensed water according to the present invention, the softened water used for the fire tube boiler is supplied from the water supply pump of the soft water station, and is respectively connected with the high-temperature boiler sewage and boiler exhaust water through the boiler exhaust heat exchange and the flue gas condenser. The smoke undergoes a heat exchange, and the preheated demineralized water enters the stainless steel hot water tank to absorb the sewage flash steam and the high-temperature condensed water flash steam of the workshop (muffling device can be installed), and the demineralized water after the temperature is further increased and the hotter and The high-temperature condensed water in the workshop after iron removal is mixed and temporarily stored in the stainless steel hot water tank. The hotter hot water in the stainless steel hot water tank (mixed with softened water and condensed water) is sent to the thermal deaerator through a circulating pump, and after the thermal deaerator is further heated and deoxidized by steam, it passes through the first-level economizer of the boiler (body energy saving device) enters the boiler after reheating. The patent of the present invention uses waste heat from boiler blowdown and smoke exhaust, as well as condensed water and flash steam produced in workshops, to make up boiler water to achieve centralized utilization of waste heat and condensed water, which not only reduces the steam consumption of the deaerator, but also enhances the effect of waste heat absorption. Simplify the connecting pipe of the deaerator, reduce the pollution of heat and condensed water to the environment, and do not affect the boiler water supply when the heat exchange equipment fails.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of hot water tank;

Fig. 3 is a view from direction A in Fig. 2 .

Detailed ways

A boiler replenishment system for collecting waste heat and condensed water shown in Figure 1-3 includes a fire tube saturated steam boiler 1, a fire tube saturated steam boiler 1 with a first-level boiler economizer 2, and a fire tube saturated steam boiler The boiler sewage pipe 17 of 1 is connected to the sewage expansion tank 16, and the steam outlet of the sewage expansion tank 16 is connected to a hot water tank 35 through the sewage flash steam pipe 18, and the sewage pipe of the sewage expansion tank 16 is connected to the continuous exhaust heat exchanger 15, The continuous row heat exchanger 15 is a water-to-water heat exchanger, and the continuous row heat exchanger 15 is also connected with a softened water inlet pipe 14, which is connected to a softening water station through a water supply pump 13. The exchanger 15 heats the demineralized water at low temperature and then discharges it. The demineralized water outlet pipe 19 of the heat exchanger 15 is connected to the boiler secondary economizer 20 and then connected to the hot water tank 35, and the demineralized water inlet pipe 14 is connected to the After the water supply pump 13, the hot water tank 35 is bypassed through the bypass pipe 12, and the bypass pipe 12 is provided with a solenoid valve 27, so as to prevent that the heat exchanger 15 or the secondary economizer 20 of the boiler cannot be used for heat. Water tank 35 replenishes water in time. The hot water tank 35 is connected to the hot water outlet pipe 3, and the hot water outlet pipe 3 is sequentially connected to the circulation pump 22, the thermal deaerator 4, the boiler feed water pump 5 and the first-level boiler economizer 2, and then connected to the water inlet of the boiler 1, and the hot water outlet The water pipe 3 finally enters the fire tube saturated steam boiler 1 from the first-stage economizer 2 of the boiler. Both the boiler primary economizer 2 and the boiler secondary economizer 20 are flue gas condensers. Both the thermal deaerator 4 and the fire tube saturated steam boiler 1 are prior art, so they will not be described in detail.

The present invention also includes a low-temperature condensation water pipe 9 connected to the combined air conditioner, heating equipment and heat exchanger, and the low-temperature condensation water pipe 9 is connected to the first condensation water recovery tank 10, the first iron removal equipment 11 and the iron ion online monitoring device 36 in sequence Access the hot water tank 35. The low-temperature condensed water pipe 9 recovers the low-temperature condensed water in the combined air conditioner, heating equipment and heat exchanger through the first condensed water recovery tank 10, then passes through the first iron removal equipment 11 to remove iron, and finally transports it to the hot water tank 35 for softening The water is heated together.

The present invention also includes a flash tank 7 connected to the high-temperature condensate pipe 6 in the workshop, the steam outlet of the flash tank 7 is connected to the hot water tank 35 through the condensate flash steam pipe 21, and the outlet of the flash tank 7 is connected to the high-temperature condensate pipe 24. The high-temperature condensate pipe 24 is sequentially connected to the second condensate recovery tank 8, the second iron removal equipment 23 and the iron ion online monitoring device 36, and then connected to the hot water tank 35. In this way, the high-temperature condensate in the workshop passes through the flash tank 7 After that, it is separated into high-temperature condensed water flash steam in the workshop and high-temperature condensed water in the workshop. The flash steam is connected to the hot water tank 35 through the condensed water flash steam pipe 21 and absorbed and heated by the low-temperature condensed water and softened water. The high-temperature condensed water in the workshop passes through the high-temperature condensed water pipe 24 After being recovered by the second condensed water recovery tank 8, the iron is removed by the second iron removal equipment 23 and sent to the hot water tank 35 to be heated for low-temperature condensed water and softened water and mixed for use.

Described hot water tank 35 is the stainless steel hot water tank 35 of rectangular parallelepiped, and hot water tank 35 comprises casing 34, and the left and right sides of casing 34 is oppositely arranged with two vertical square dividers: the second divider 32 and the first divider. Plate 30, a gap is set between the top of the second dividing plate 32 and the top plate of the box body 34, the two side ends of the second dividing plate 32 are fixedly connected with the two inner side walls of the box body 34 respectively, the bottom end of the second dividing plate 32 is connected with the A gap is set between the bottom plates of the box body 34, a gap is set between the top of the first dividing plate 30 and the top plate of the box body 34, the two side ends of the first dividing plate 30 are fixedly connected with the two inner side walls of the box body 34 respectively, the first dividing plate The bottom of the plate 30 is fixedly connected to the bottom plate of the box body 34, and the second and first partitions 32, 30 divide the box body 34 into three sub-boxes from left to right: the third sub-box 33, the second sub-box 31 The box body 34 corresponding to the first sub-box 29 and the third sub-box 33 is connected to the softened water outlet pipe 19 and the low-temperature condensate water pipe 9, and the box body 34 corresponding to the second sub-box 31 is connected to the blowdown flash steam Pipe 18 and condensate flash steam pipe 21, sewage flash steam pipe 18 and condensate flash steam pipe 21 are all connected to the top plate of the box body 34 corresponding to the second sub-box 31, and on the box body 34 corresponding to the first sub-box 29 Connect the hot water outlet pipe 3 and the high temperature condensation water pipe 24. The tank body 34 corresponding to the first sub-box 29 is provided with a liquid level sensor 26, and the liquid level sensor 26 is signal-connected with the water supply pump 13 of the water softening station. The tank body 34 corresponding to the first sub-box 29 is connected with an overflow pipe 25 for controlling the water level of the first sub-box 29 , and the top of the first partition 30 is lower than the overflow port of the overflow pipe 25 on the tank body 34 . The bottom of the second and first sub-boxes 31, 29 is connected with a blowdown pipe 28 with an on-off valve.

In order to make the water in the third sub-box 33 absorb the flash steam better, and the air in the upper part of the hot water tank can be communicated, the top of the second dividing plate 32 is provided with a valve for communicating with the third sub-box 33 and the second sub-box 31. Through hole 38 . The top of the hot water tank is connected with a release pipe 37, even if the third sub-box 33, the second sub-box 31 and the first sub-box 29 share a release pipe 37 to open the atmosphere, the release pipe 37 can be connected above the third sub-box 33, It can also be connected to the second sub-box 31 or the top of the first sub-box 29 .

The working process includes the following processes:

1. Process flow

The softened water used by the fire tube boiler 1 is supplied from the water supply pump of the soft water station, and undergoes a heat exchange with the boiler 1 row heat exchange, the flue gas condenser, the high-temperature boiler 1 sewage, and the boiler 1 exhaust smoke, and the heat softening after preheating Water and combined air conditioner, heating equipment and the low-temperature condensed water of heat exchanger enter the third sub-box 33 in the stainless steel hot water tank 35, and the demineralized water flows into the second sub-box 31 through the bottom of the second dividing plate 32, and in the second The lower part of sub-box 31 absorbs high-temperature condensed water and flash steam of boiler 1 blowdown water (with silencer). After the demineralized water absorbs the blowdown flash steam and the workshop high-temperature condensate flash steam, the demineralized water after further temperature rise will rise to the upper part of the second sub-box 31, and the demineralized water in the upper part of the second sub-box 31 will overflow the first partition 30 The first sub-box 29 that enters the other side of the partition is mixed with the hotter and high-temperature condensed water after iron removal, and temporarily stored in the first sub-box 29 . The relatively hot hot water in the first sub-box 29 (after the softened water and condensed water are mixed) is sent to the thermal deaerator 4 through the circulation pump 22, and then sent to The boiler primary economizer 2 (body economizer) absorbs the waste heat of the flue gas again and enters the boiler 1 for use.

2. Flash steam process

The continuous blowdown (surface blowdown) of the boiler 1 is discharged into the blowdown expansion tank 16, and the flash steam generated enters the second sub-box 31 of the stainless steel hot water tank 35 to be absorbed by softened water, and the remaining sewage enters the continuous row heat exchange and softened water exchange heat.

The high-temperature condensed water in the workshop is first collected into the flash tank 7, and the flash steam generated enters the second sub-box 31 of the stainless steel hot water tank 35 and is absorbed by the softened water. The condensed water after flash evaporation enters the condensed water recovery tank, and then passes through the iron removal equipment Iron removal, after the online iron ion detection is qualified, enters the first sub-box 29 in the stainless steel hot water tank 35.

3. Prevent water shortage and overflow of the stainless steel hot water tank 35.

Connect the first sub-box 29 in the stainless steel hot water tank 35 to the softened water inlet pipe 14 directly by bypass (controlled by the solenoid valve 27). This bypass pipe 12 directly enters the first sub-case 29 to prevent water shortage. If the water level of the water tank is higher, the water supply pump 13 of the liquid level sensor 26 transmits a signal to the soft water station to stop running, preventing the water from overflowing the stainless steel hot water tank 35.

4. Stainless steel hot water tank 35 basic structure.

Two dividing plates are set in the stainless steel hot water tank 35: the first dividing plate 30 and the second dividing plate 32, the hot water tank 35 is divided into three parts. The first dividing plate 30 is connected with the bottom of the hot water tank 35, and should not be too high. It will affect the absorption of demineralized water to secondary steam. The second dividing plate 32 is connected to the top of the box body 34, and the distance from the bottom should not be too large, as long as the water flow can be satisfied, which can prevent the water without absorbing the flash steam from directly overflowing into the first sub-box 29. The clapboard separates the demineralized water from the high-temperature condensed water, but the demineralized water can overflow into the high-temperature condensed water, and the low-temperature demineralized water and condensed water can only enter the second sub-box 31 from the bottom of the first sub-box 29, so that It can fully absorb the flash steam to the greatest extent, and only when it overflows the first partition 30 can it enter the first sub-box 31 and mix with high-temperature condensed water before flowing out for use.

Of course, the present invention is not limited to the above-mentioned forms, and other types of boilers can be used, and low-temperature condensate pipes can be connected to one or more of combined air conditioners, heating equipment, and heat exchangers.

Claims (10)

1. A boiler replenishment system for collecting waste heat and condensed water, characterized in that: the boiler blowdown pipe of the boiler is connected to the blowdown expansion tank, the steam outlet of the blowdown expansion vessel is connected to a hot water tank through the blowdown flash steam pipe, and the blowdown expansion tank The sewage pipe of the exhaust pipe is connected to the heat exchanger, and the heat exchanger is connected to the softened water inlet pipe. The softened water inlet pipe is connected to the softening water station through the water supply pump, and the softened water outlet pipe of the heat exchanger is connected to the secondary economizer of the boiler. Then connect to the hot water tank, the hot water tank is connected to the hot water outlet pipe, and the hot water outlet pipe is connected to the boiler water inlet after being connected to the circulation pump, the thermal deaerator and the boiler feed water pump in turn. 2. The boiler replenishment system for collecting waste heat and condensed water according to claim 1, characterized in that: it also includes low-temperature condensed water pipes connected to combined air conditioners and/or heating equipment and/or heat exchangers, and the low-temperature condensed water pipes are connected sequentially The first condensed water recovery tank and the first iron removal equipment are then connected to the hot water tank. 3. The boiler water supply system for collecting waste heat and condensed water as claimed in claim 2, characterized in that: it also includes a flash tank connected to the high-temperature condensed water pipe in the workshop, and the steam outlet of the flash tank is connected to the condensed water flash steam pipe. into the hot water tank, the outlet of the flash tank is connected to a high-temperature condensate pipe, and the high-temperature condensate pipe is connected to the second condensate recovery tank and the second iron removal equipment in turn, and then connected to the hot water tank. 4. The boiler water supply system for collecting waste heat and condensed water as claimed in claim 3, characterized in that: after the softened water inlet pipe is connected to the water supply pump, it is also connected to the hot water tank through a bypass pipe, and the bypass pipe is provided with There is a solenoid valve. 5. The boiler replenishment system for collecting waste heat and condensed water as claimed in claim 4, characterized in that: the hot water tank comprises a box body, and two vertical partitions are arranged opposite to each other in the left and right sides of the box: the second partition and The top of the first partition, the top of the second partition is fixedly connected to the top plate of the box, the two sides of the second partition are fixedly connected to the two inner walls of the box, and the bottom of the second partition is arranged between the bottom of the box Gap, there is a gap between the top of the first partition and the top plate of the box, the two sides of the first partition are fixedly connected with the two inner walls of the box, the bottom of the first partition is fixedly connected with the bottom of the box, the second 2. The first partition divides the box into three sub-boxes from left to right: the third sub-box, the second sub-box and the first sub-box. The box corresponding to the third sub-box is connected with the softened water Outlet pipes and low-temperature condensate pipes, the tank corresponding to the second sub-box is connected to the sewage flash steam pipe and condensate flash steam pipe, and both the sewage flash steam pipe and condensate flash steam pipe are connected to the tank corresponding to the second sub-box On the top plate of the body, the box body corresponding to the first sub-box is connected with the hot water outlet pipe and the high-temperature condensation water pipe. 6. The boiler water replenishment system for collecting waste heat and condensed water as claimed in claim 5, characterized in that: a liquid level sensor is provided in the tank corresponding to the first sub-box, and the liquid level sensor is connected with the water supply pump signal of the soft water station, The tank corresponding to the first sub-box is connected with an overflow pipe for controlling the water level of the first sub-box. The top of the first partition is lower than the overflow port of the overflow pipe on the box body. The bottom of the bottom is connected with a sewage pipe with a switch valve. 7. The boiler replenishment system for collecting waste heat and condensed water according to any one of claims 1-6, characterized in that: the boiler is a fire-tube saturated steam boiler, and the fire-tube saturated steam boiler is equipped with a first-level energy-saving boiler The hot water outlet pipe enters the fire tube saturated steam boiler from the first-level economizer of the boiler. 8. The boiler water supply system for collecting waste heat and condensed water as claimed in claim 7, characterized in that: the first-level boiler economizer and the second-level boiler economizer are both flue gas condensers, and the heat exchanger is a continuous heat exhaust switch. 9. The boiler water supply system for collecting waste heat and condensed water according to claim 8, characterized in that: the top of the second partition is provided with a through hole for communicating with the third sub-box and the second sub-box. 10. The boiler replenishment system for collecting waste heat and condensed water according to claim 8, characterized in that: the hot water tank is a rectangular parallelepiped stainless steel hot water tank.

Images