CN212806691U - Steam waste heat recycling system - Google Patents
Steam waste heat recycling system Download PDFInfo
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- CN212806691U CN212806691U CN202021570592.8U CN202021570592U CN212806691U CN 212806691 U CN212806691 U CN 212806691U CN 202021570592 U CN202021570592 U CN 202021570592U CN 212806691 U CN212806691 U CN 212806691U
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Abstract
The application relates to the technical field of energy conservation and environmental protection, and discloses a steam waste heat recycling system which comprises a primary waste heat collecting tank, a pre-curing chamber, a slurry tank, a silencing and steam exhausting pipeline, a drainage and steam exhausting pipeline and a waste heat steam recycling and collecting pipeline, wherein silencers are arranged at two ends of the drainage and steam exhausting pipeline and at two ends of the silencing and steam exhausting pipeline; one end of the waste heat steam recovery collecting pipeline is communicated with a first waste heat steam recovery pipeline, and the other end of the waste heat steam recovery collecting pipeline is communicated with a second waste heat steam recovery pipeline; the first waste heat steam recovery pipeline is communicated to the primary waste heat collecting tank to obtain high-temperature hot water, and then the high-temperature hot water is sent back to the boiler; the second waste heat steam recovery pipeline is communicated with the pre-curing chamber and the slurry tank. The waste heat steam is recycled, on one hand, the waste of energy is reduced, the heat energy of the waste heat steam is fully utilized, and the energy-saving benefit is remarkable; on the other hand, the amount of suspended particles formed in the air when steam is not used for discharging is also reduced, and environmental improvement is realized.
Description
Technical Field
The utility model belongs to the technical field of energy-concerving and environment-protective.
Background
With the continuous improvement of the requirement of China on the heat insulation performance of the building structure, the using amount of the aerated concrete block with good heat insulation performance is rapidly increased, and the production enterprises and the production scale are also rapidly increased. However, due to the limitation of factors such as design, process, management and technical level, most of the aerated concrete block enterprises in China currently form 0.4-0.6MPa/cm under the regulation of a valve control switch of a cylinder-separating pipeline after autoclaved curing of the aerated concrete blocks3The waste heat steam is directly discharged into the atmosphere, the waste heat steam is seriously wasted, and the noise is very high when the waste heat steam is discharged, so that the noise pollution is caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a steam waste heat recovery utilizes system to solve the current problem that evaporates the direct emission of cauldron waste heat steam and cause waste heat waste and noise pollution.
In order to achieve the purpose, the utility model provides a steam waste heat recycling system, which comprises a primary waste heat collecting tank, a pre-curing chamber, a slurry tank, a middle steam exhaust pipeline arranged in the middle of the still kettle and a bottom pipeline arranged at the bottom of the still kettle, wherein the middle steam exhaust pipelines of all the still kettles are connected with a noise elimination steam exhaust pipeline; the bottom pipeline is provided with a steam exhaust outlet, the steam exhaust outlets of all the still kettles are communicated with a water-drainage steam exhaust pipeline, two ends of the water-drainage steam exhaust pipeline and two ends of the noise elimination steam exhaust pipeline are provided with silencers, and the water-drainage steam exhaust pipeline and the noise elimination steam exhaust pipeline which are positioned on the same side are communicated with a waste heat steam recovery collecting pipeline;
a first heat exchanger is arranged in the primary waste heat collecting tank, and a pipeline heat absorption and release facility is arranged in the pre-curing chamber; a first waste heat steam recovery pipeline control valve is arranged at the end part of one waste heat steam recovery manifold and communicated with a first waste heat steam recovery pipeline, and the first waste heat steam recovery pipeline is communicated with a first heat exchanger in the primary waste heat water collecting tank; a water outlet of the primary waste heat collecting tank is provided with a circulating pump which is communicated with the boiler through a pipeline; and the end part of the other waste heat steam recovery collecting pipeline is provided with a second waste heat steam recovery pipeline control valve and is communicated with a second waste heat steam recovery pipeline, and the second waste heat steam recovery pipeline is simultaneously communicated with the slurry tank and the heat absorption and release facilities of the pipelines of the pre-curing chamber.
The principle and the beneficial effect of the basic scheme are as follows:
(1) in the aspects of waste heat recovery and energy-saving benefits, the steam is recovered through the waste heat steam recovery collecting pipeline, the steam recovery rate reaches more than 80%, and people can conveniently utilize the heat of the waste heat steam; through the first waste heat steam recovery pipeline and the second waste heat steam recovery pipeline, waste heat steam can be respectively conveyed to the primary waste heat collecting tank, the pre-curing chamber and the slurry tank, water in the primary waste heat collecting tank is heated to be more than 95 ℃ by utilizing the heat of the waste heat steam, constant-temperature pre-curing is carried out on the semi-finished aerated concrete block in the pre-curing chamber, the slurry tank is heated, the recovered waste heat steam is utilized, the waste of energy is reduced, energy required by constant-temperature pre-curing of the pre-curing chamber, temperature rising of the slurry tank and heating of the primary waste heat collecting tank is saved, economic cost is saved, and energy-saving benefits are remarkable.
(2) In the aspect of noise control, in a traditional aerated concrete production system, 2 silencers are installed at a steam outlet of each still kettle, if 6 still kettles need 12 silencers, the noise during steam discharge is still more than 80 decibels, great interference is caused to workers and surrounding residents, and the workers can work only by wearing earplugs. The scheme is that the silencers are arranged at two ends of the drainage steam exhaust pipeline and two ends of the silencing steam exhaust pipeline, the whole waste heat steam recovery system only needs 4 silencers, the cost is reduced, waste heat steam completes the noise treatment in the recovery process, the noise is reduced to be below 45 decibels, and the noise treatment effect is very obvious.
(3) In the aspect of operation safety, the bottom steam exhaust of the traditional still kettle directly discharges 146 ℃ high-temperature waste heat steam into the air, the pressure during the discharge of the waste heat steam is very high, the waste heat steam can be sprayed for tens of meters, the impact force is very large, the temperature is very high, and workers are easily burnt if contacting the waste heat steam, so that great potential safety hazards exist. And this scheme is through gathering and retrieving waste heat steam, the potential safety hazard that exists when both having solved waste heat steam and discharging can absorb, administer the noise again, can also reduce the waste of the energy.
(4) In the aspect of environmental pollution treatment, high-temperature steam discharged from a still kettle is directly discharged into the air in the production process of the traditional aerated concrete, and the steam can adsorb more dust in the air condensation process, so that a plurality of suspended particles are formed in the air, and environmental pollution is caused. According to the scheme, high-temperature steam discharged from the still kettle is recycled, and the high-temperature steam is not directly discharged into the air any more, so that the content of suspended particles in the air can be reduced, and pollution control is realized.
(5) In the aspects of production efficiency and product quality, high-temperature hot water in the primary waste heat collecting tank heated by waste heat steam is conveyed to the boiler, so that the time required by boiler water heating is shortened, the yield of products is greatly improved, and the energy-saving benefit is more than 30%. Meanwhile, the semi-finished product of the aerated concrete block is pre-cured by utilizing the waste heat steam, and the slurry tank is heated and mixed, so that the product quality of the autoclaved aerated concrete block can be improved.
Optionally, the system further comprises a secondary waste heat collecting tank, and a second heat exchanger is arranged in the secondary waste heat collecting tank; the first-stage waste heat collecting pool is provided with a first waste steam pipeline communicated with the first heat exchanger, and the first waste steam pipeline is communicated with a second heat exchanger in the second-stage waste heat collecting pool; and a water outlet of the secondary waste heat collecting tank is also provided with a circulating pump, and the circulating pump is communicated with the primary waste heat collecting tank through a pipeline.
After the heat exchange of the waste heat steam is completed in the primary waste heat collecting tank, the waste heat steam is discharged from the first waste steam pipeline, the waste heat steam still has certain heat, and if the waste heat steam is directly discharged, larger energy waste can still be caused. This scheme is through setting up second grade waste heat catch basin, second heat exchanger and first residual steam pipeline, carry out further waste heat utilization to the exhaust waste heat steam from first heat exchanger, heat the water in the second grade waste heat catch basin to more than 35 ℃, then go into the one-level waste heat catch basin with the water pump after the heating again in, the energy that the part consumed the water heating in the one-level waste heat catch basin to more than 95 ℃ has been practiced thrift, the water heating in the one-level waste heat catch basin has also been shortened simultaneously to the required time more than 95 ℃, the utilization ratio of waste heat steam has been improved.
Optionally, the pre-curing chamber is provided with a second residual steam pipeline, and the second residual steam pipeline and the first residual steam pipeline are merged and then introduced into a second heat exchanger in the secondary waste heat water collecting tank.
The waste heat steam exhausted from the heat absorbing and releasing facilities in the pipeline of the pre-curing chamber still has certain heat, and if the waste heat steam is directly exhausted, great energy waste is caused. According to the scheme, the part of waste heat steam is introduced into the second heat exchanger in the secondary waste heat collecting tank, the waste heat of the part of steam is further utilized, the utilization rate of the waste heat steam is improved, and meanwhile, the time for heating the water in the secondary waste heat collecting tank to be more than 35 ℃ is further shortened.
Optionally, the secondary waste heat collecting tank is provided with a waste water and waste steam pipeline, one end of the waste water and waste steam pipeline is communicated with the second heat exchanger, and the other end of the waste water and waste steam pipeline is communicated with a steam-water recovery tank.
The steam discharged from the second heat exchanger of the secondary waste heat collecting tank has little heat, so the waste heat steam discharged from the second waste steam pipeline can be basically condensed into water, and the part of the waste steam and the waste water can be recycled into the steam-water recovery tank for reutilization, thereby saving energy.
Optionally, the steam-water recovery tank is communicated with the slurry tank through a pipeline.
The residual water and the residual steam in the steam-water recovery tank still have certain heat, and the materials in the slurry tank need to be added with water and heated in the stirring and mixing process. This scheme lets in the surplus water vapor in the soda recovery pond to the sizing agent pond, and with the material mixture intensifies, has realized the reuse of surplus water vapor in the soda recovery pond, has reduced the waste of the energy, has saved the economic cost who adds water, intensifies with the sizing agent pond.
Optionally, the first heat exchanger and the second heat exchanger are both coil-type spiral fin radiators.
The coiled pipe type spiral fin radiator is adopted to exchange heat of waste heat steam entering the primary waste heat collecting tank and waste heat steam entering the secondary waste heat collecting tank, the heat absorption and radiation areas are large, the heat exchange efficiency is high, and heat exchange can be better carried out on the waste heat steam.
Optionally, the secondary waste heat collecting tank is further provided with an overflow pipe, a blow-off pipe and a thermometer.
In the secondary waste heat collecting tank, if the water level is too high or steam is generated, the water or the steam can be discharged from the overflow pipe and enter the steam-water recovery tank. After a certain period of use, the secondary waste heat collecting tank can generate certain sediments which can be discharged through a drain pipe. The temperature in the second grade waste heat collecting tank can be conveniently known by an operator in time due to the arrangement of the thermometer.
Optionally, the pipeline heat absorption and release facility of the pre-curing chamber comprises a coiled fin tube radiator, a plate type multi-tube fin radiator, a drain valve and a flow control valve for regulating the steam flow in the pre-curing chamber.
Through snakelike finned tube radiator, board-like multitube fin radiator, can utilize waste heat steam's heat to carry out the constant temperature to the aerated concrete block semi-manufactured goods in the room of procuring in advance and procuring to through trap with the comdenstion water discharge and the concentrated recovery that produce in the pipeline.
When the steam pressure of the waste heat steam discharged from the outlet of the still kettle is more than or equal to 0.5MPa/cm3When the temperature is about 146 ℃, if the residual heat steam is directly conveyed into the pre-curing chamber, even if partial heat is lost in the process of conveying the residual heat steam, the temperature of the residual heat steam conveyed into the pre-curing chamber is still higher. In this case, the semi-finished product of the aerated concrete block in the pre-curing chamber may crack due to the over-high temperature, which affects the quality of the product. The scheme adjusts the steam flow in the pre-curing chamber through the flow control valve to ensure that the pre-curing chamber is pre-curedThe required optimal curing temperature is reached in each section and section of the room, the operation is convenient, the pre-curing effect of the semi-finished aerated concrete block can be improved, and the product quality is ensured.
Optionally, the bottom pipeline is further provided with a drainage outlet, the drainage outlets of all the still kettles are communicated with a drainage pipeline, and the drainage pipeline is connected with a drainage water collecting tank.
By the design, water discharged by the drain valve can be recycled, and the waste of resources is reduced.
Optionally, a heat insulation layer is arranged outside the primary waste heat collecting tank, and an overtemperature self-exhaust steam pipeline is arranged at the top of the primary waste heat collecting tank; a thermometer and a water level gauge are also arranged on the first-stage waste heat collecting tank.
The heat preservation can play better heat preservation effect to one-level waste heat catch basin, can reduce the calorific loss of waste heat steam. A thermometer and a water level gauge are arranged in the primary waste heat collecting tank, so that an operator can know the water temperature and the water level in the primary waste heat collecting tank conveniently in time.
The overtemperature self-exhaust steam pipeline is arranged at the top of the primary waste heat collecting tank, so that the primary waste heat collecting tank is always in a non-pressure state. When the water temperature exceeds the upper limit (namely is more than or equal to 95 ℃), an operator can be reminded to timely control the on-off of the residual steam pipeline control valve so as to adjust the steam flow, thereby adjusting the intensity of heat exchange, ensuring the use safety of facilities and avoiding over-temperature and over-pressure.
Drawings
Fig. 1 is a flow chart of a steam waste heat recycling system of the present invention;
fig. 2 is a schematic view of a top view structure layout of the steam waste heat recycling system of the present invention;
FIG. 3 is a schematic front structural view of the connection of the still kettle with a steam exhaust pipeline and a silencing steam exhaust pipeline;
FIG. 4 is a schematic position diagram of an economizer, a boiler and a primary waste heat collecting tank;
FIG. 5 is a schematic structural diagram of the primary afterheat collecting tank in FIG. 2;
FIG. 6 is a front cross-sectional view of FIG. 5;
FIG. 7 is a left side cross-sectional view of FIG. 5;
FIG. 8 is a formal cross-sectional view of the secondary waste heat collection basin of FIG. 2;
FIG. 9 is a schematic view of the structure of the pre-curing chamber.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: a boiler 1, a steam-distributing cylinder and valve control switch 2, a still kettle 3, a waste heat steam recovery header pipeline 4, a drainage steam exhaust pipeline 5, a silencing steam exhaust pipeline 6, a silencer 7, a first waste heat steam recovery pipeline 8, a primary waste heat collecting tank 9, a heat-insulating layer 10, an overtemperature self-steam exhaust pipeline 11, a thermometer 12, a water level meter 13, a movable sealing cover 14, a ladder stand 15, a first heat exchanger 16, a steam-water recovery tank 17, a second waste heat steam recovery pipeline 18, a pre-curing chamber 19, a snakelike finned tube radiator 20, a plate type multi-tube finned tube radiator 21, a drain valve 23, a slurry tank 24, a secondary waste heat collecting tank 25, a second heat exchanger 26, an overflow pipe 27, a blow-off pipe 28, a first waste steam pipeline 29, a second waste steam pipeline 30, a waste water and waste steam pipeline 31, a first waste heat steam recovery pipeline control valve 32, a second waste heat steam recovery pipeline control valve 33, a safety valve steam exhaust, The device comprises a middle steam exhaust stop valve 35, a middle steam exhaust one-way valve 36, a steam-water bag 37, a drain valve 38, a drain pipe 39, a drain water collecting tank 40, a bottom steam exhaust valve 41 and an economizer 42.
Example 1
A steam waste heat recycling system is shown in the attached figure 2 and mainly comprises a primary waste heat collecting tank 9, a secondary waste heat collecting tank 25, a pre-curing chamber 19, a slurry tank 24 and a steam-water recycling tank 17, wherein a steam inlet of a still kettle 3 is communicated with a boiler 1 through a pipeline, a steam distributing cylinder and a valve control switch 2. The work flow diagram of the system is shown in figure 1.
As shown in the attached drawing 3, a safety valve steam exhaust device 34 is installed at the top of the still kettle 3 to prevent the overpressure phenomenon in the still kettle and ensure the safety of the still kettle. The middle part of still kettle 3 is connected with middle part exhaust steam pipe, installs middle part exhaust steam stop valve 35 and middle part exhaust steam check valve 36 on the middle part exhaust steam pipe, avoids the waste heat steam refluence. The middle steam exhaust pipelines of all the still kettles 3 are connected with a silencing steam exhaust pipeline 6, and silencers 7 are arranged at two ends of the silencing steam exhaust pipeline 6.
The bottom of the still kettle 3 is communicated with a bottom pipeline, a steam water bag 37 is arranged on the bottom pipeline, the bottom pipeline is provided with a drainage outlet and a steam exhaust outlet, a drain valve 38 is arranged in the drainage outlet, the drainage outlets of all the still kettles 3 are communicated with a drainage pipeline 39, and the drainage pipeline 39 is introduced into a drainage water collecting tank 40 to recycle the water; the steam outlet is provided with a bottom steam exhaust valve 41, and the steam outlets of all the autoclaves 3 are communicated with a steam drainage and exhaust pipeline 5. The two ends of the steam drainage and exhaust pipeline 5 are both provided with silencers 7, one end of the steam drainage and exhaust pipeline 5 and the end part of the same-side steam silencing and exhaust pipeline 6 are both communicated with a waste heat steam recovery and collection pipeline 4, and the other end of the steam drainage and exhaust pipeline 5 and the end part of the same-side steam silencing and exhaust pipeline 6 are also both communicated with a waste heat steam recovery and collection pipeline 4.
When the steam is discharged from the still kettles 3, the steam is discharged one by one, and the steam discharging time of one still kettle 3 is about 2 hours. The bottom steam discharge of the traditional still kettle 3 is to directly discharge high-temperature waste heat steam with the temperature of 146 ℃ into the air, the pressure during the discharge of the waste heat steam is very high, the waste heat steam can be sprayed for tens of meters, the impact force is very large, the temperature is very high, and workers can be easily burnt if contacting the waste heat steam, so that great potential safety hazards exist; and the noise during the discharge is very large, which is far more than 85 decibels, and causes great interference to workers and surrounding residents. And this embodiment is through gathering and retrieving waste heat steam, has both solved the potential safety hazard that exists when waste heat steam discharges, can absorb, administer the noise again, can also reduce the waste of the energy.
Referring to fig. 6 and 7, a first heat exchanger 16 is mounted on the inner wall of the primary waste heat collecting tank 9, and the first heat exchanger 16 is a coiled spiral fin radiator made of SUS 304. A first waste heat steam recovery pipeline control valve 32 is arranged at the end part of one waste heat steam recovery collecting pipeline 4 and communicated with a first waste heat steam recovery pipeline 8; a second waste heat steam recovery pipeline control valve 33 is installed at the end part of the other waste heat steam recovery collecting pipeline 4 and communicated with a second waste heat steam recovery pipeline 18, the first waste heat steam recovery pipeline 8 conveys waste heat steam to a first heat exchanger 16 in a primary waste heat collecting tank 9, heat conduction exchange is carried out by the first heat exchanger 16, water in the primary waste heat collecting tank 9 is heated, and high-temperature hot water with the temperature of more than 95 ℃ can be obtained. Referring to fig. 4, the high-temperature hot water in the primary waste heat collecting tank 9 is sent to the economizer 42 of the boiler 1 by the circulating pump, and then sent back to the boiler 1 by the economizer 42, and heated by the boiler 1 to become steam with required pressure for recycling of the still kettle 3. In this embodiment, the circulating pump is a high temperature resistant feed pump, such as a high temperature resistant vertical stainless steel multistage centrifugal pump, which meets the feed pressure and flow rate of the boiler 1.
Because the temperature of the water sent into the boiler 1 by the primary waste heat collecting tank 9 is higher than 95 ℃, steam is generated at this time, if the water is pumped into the boiler 1 in a pumping mode, the phenomenon of virtual pumping (namely water cannot be pumped into the boiler 1) of the circulating pump can be caused, and the water cannot be pumped into the boiler 1. In the embodiment, water is firstly sent into the energy saver 42 on the boiler 1 from the rear end of the circulating pump by using high pressure, and then sent into the boiler 1 by the energy saver 42, so that the phenomenon of virtual pumping of the circulating pump is avoided, and high-temperature hot water in the primary waste heat collecting tank 9 can be ensured to smoothly enter the boiler 1.
Wherein, the first-stage waste heat collecting tank 9 comprises a first tank body, heat preservation layers 10 are arranged on the periphery, the upper surface and the lower surface of the first-stage waste heat collecting tank 9, and the thickness of the heat preservation layers 10 is less than or equal to 100 mm. The heat-insulating layer 10 is a silicate heat-insulating layer 10. The heat preservation layer 10 can play a good heat preservation role in the primary waste heat collecting tank 9, and can reduce the heat loss of waste heat steam. The first heat exchanger 16 is installed on the inner wall of the first tank body and is communicated with the first waste heat steam recovery pipeline 8. Referring to fig. 5, a ladder 15 is arranged outside the primary waste heat collecting tank 9, and a movable sealing cover 14 is arranged at the top of the primary waste heat collecting tank for an operator to overhaul. The top of the first-stage waste heat collecting tank 9 is also provided with an overtemperature self-exhaust steam pipeline 11, when the water temperature exceeds the upper limit (namely is more than or equal to 95 ℃), an operator can be reminded to timely control the on-off of a waste steam pipeline control valve so as to adjust the steam flow, thereby adjusting the intensity of heat exchange, ensuring the use safety of facilities and preventing overtemperature and overpressure. A thermometer 12 and a water level gauge 13 are arranged in the primary waste heat collecting tank 9, so that an operator can observe the temperature and the water level in the primary waste heat collecting tank 9 conveniently.
And a part of the waste heat steam conveyed by the second waste heat steam recovery pipeline 18 is introduced into the pre-curing chamber 19, heat exchange is realized through a snakelike finned tube radiator 20 and a plate type multi-tube finned tube radiator 21 of the pre-curing chamber 19, and the semi-finished aerated concrete block in the pre-curing chamber 19 is pre-cured at a constant temperature of 40-60 ℃. And the condensed water generated in the pipeline is discharged through the drain valve 23 and is collected and recovered. If the temperature of the pre-curing chamber 19 is unbalanced, the semi-finished autoclaved aerated concrete is partially heated, and the semi-finished autoclaved aerated concrete is partially heated, or is not heated, so that the reaction speed is unbalanced, and the strength is not ensured. In the embodiment, the steam flow in the pre-curing chamber 19 is adjusted through the flow control valve to reach the optimal curing temperature required by each section of the pre-curing chamber 19, so that the quality of the semi-finished aerated concrete block is improved.
The second waste heat steam recovery pipeline 18 conveys the other part of waste heat steam to directly enter the slurry tank 24 (water is needed during mixing in the slurry tank 24, and the temperature needs to be raised and mixed), and the waste heat steam is mixed with the material to be raised, wherein the temperature is 40-50 ℃, the chemical reaction speed of the material is accelerated, the material mixing efficiency is improved, and the energy-saving benefit is improved.
Referring now to FIG. 9, a serpentine finned tube radiator 20 is mounted on one of the inside faces of the chamber 19 and a plate type multi-tube finned radiator 21 is mounted on the other inside face of the chamber 19. The bottom of the pre-curing chamber 19 is provided with a drain valve 23, and all the drain valves 23 are connected with a drain valve 23 connecting pipeline together and used for discharging condensed water in the pipeline.
And a second heat exchanger 26 is arranged on the inner wall of the secondary waste heat collecting tank 25, and the second heat exchanger 26 adopts a coiled spiral fin radiator made of SUS 304. The bottom of the primary waste heat collecting tank 9 is provided with a first waste steam pipeline 29 communicated with the output end of the first heat exchanger 16, the first waste steam pipeline 29 is communicated with a second heat exchanger 26 in the secondary waste heat collecting tank 25 to heat water in the secondary waste heat collecting tank 25, hot water with the temperature being higher than 35 ℃ is formed, and the hot water in the secondary waste heat collecting tank 25 is sent into the primary waste heat collecting tank 9 by a circulating pump. The circulating pump adopts a high-temperature resistant water feeding pump. The pre-curing chamber 19 is provided with a second residual steam pipeline 30, and the second residual steam pipeline 30 and the first residual steam pipeline 29 are merged and then introduced into the second heat exchanger 26 in the secondary residual heat collecting tank 25.
The secondary waste heat collecting tank 25 includes a second tank body, and as shown in fig. 8, a second heat exchanger 26 is installed on an inner wall of the second tank body. A thermometer 12 and a water temperature meter are also arranged in the secondary waste heat collecting tank 25. In addition, an overflow pipe 27 and a drain pipe 28 are installed at the bottom of the secondary waste heat collecting tank 25, and if the water level in the secondary waste heat collecting tank 25 is too high or steam is generated, the water or the steam can be discharged from the overflow pipe 27 and enter the steam-water recovery tank 17. If the secondary waste heat collecting tank 25 is used for a certain period of time, sediment is generated and can be discharged through the sewage discharge pipe 28.
And a residual water and residual steam pipeline 31 is arranged at the bottom of the secondary waste heat collecting tank 25, one end of the residual water and residual steam pipeline 31 is communicated with the second heat exchanger 26, and the other end of the residual water and residual steam pipeline 31 is communicated with the steam-water recovery tank 17.
When the system is in actual use, in the aspect of waste heat recovery, the waste heat steam recovery and collection pipeline 4 is used for recovering steam, the steam recovery rate reaches more than 80%, and people can utilize the heat of the waste heat steam conveniently. The method specifically comprises the following steps: through the first waste heat steam recovery pipeline 8 and the second waste heat steam recovery pipeline 18, waste heat steam can be respectively conveyed to the primary waste heat collecting tank 9, the pre-curing chamber 19 and the slurry tank 24, water in the primary waste heat collecting tank is heated to be more than 95 ℃ by utilizing the heat of the waste heat steam, constant-temperature pre-curing is carried out on the semi-finished aerated concrete block in the pre-curing chamber 19, the slurry tank 24 is heated, the recovered waste heat steam is utilized, the waste of energy is reduced, energy required by constant-temperature pre-curing of the pre-curing chamber 19, heating of the slurry tank 24 and heating of the primary waste heat collecting tank 9 is saved, and the economic cost is saved.
In terms of energy saving, taking a 6T/h gas-fired boiler 1 as an example, the temperature of water added into the boiler 1 is 25 ℃ in the prior art (the water temperature is lower in winter), the boiler 1 heats the water at 25 ℃ to 100 ℃ to form steam, and the steam is generally used for more than one hour in the processConsuming 300m3The market price of the fuel gas is about 3 yuan/m3. In the scheme, the water in the primary waste heat collecting tank 9 can be heated by utilizing the waste heat steam to form high-temperature hot water with the temperature being higher than 95 ℃, the high-temperature hot water can be directly added into the boiler 1, and the fuel gas consumed for heating the water in the boiler 1 from 25 ℃ to 95 ℃ is saved, so that the economic cost of more than 300 x 3 and 900 yuan is saved, the boiler 1 works for 12 hours a day, more than 1 million yuan can be saved in one day, millions can be saved in one year, and the energy-saving benefit is very obvious.
In the aspect of environmental management, high-temperature steam discharged from the still kettle 3 is recycled, so that the high-temperature steam is not directly discharged into the air any more, the content of suspended particles in the air can be reduced, and pollution management is realized.
In the noise control aspect, the noise generated by steam emission is more than 80 db, and workers need to wear earplugs to work. The silencer 7 is arranged at the two ends of the drainage steam exhaust pipeline 5 and the two ends of the silencing steam exhaust pipeline 6, the whole waste heat steam recovery system only needs 4 silencers 7, the cost is reduced, the waste heat steam completes the noise treatment in the recovery process, the noise is reduced to be below 45 decibels, and the noise treatment effect is very obvious.
In the aspects of production efficiency and product quality, only 8 kettles of aerated concrete blocks can be produced by one autoclave 3 a day before, 10-12 kettles can be produced by one autoclave 3 a day after the process is adopted, the yield of products is greatly improved, the process is a reasonable matched result, and the energy-saving benefit is more than 30%. Meanwhile, the semi-finished product of the aerated concrete block is pre-cured by using the waste heat steam, and the slurry tank 24 is heated and mixed, so that the product quality of the autoclaved aerated concrete block can be improved.
Example 2
The present embodiment is different from embodiment 1 in that: in this embodiment, a pipeline is also communicated between the steam-water recovery tank 17 and the slurry tank 24, and is used for introducing residual water and residual steam in the steam-water recovery tank 17 into the slurry tank 24 to be mixed with the material for heating.
The residual water and the residual steam in the steam-water recovery tank 17 still have certain heat, and the materials in the slurry tank 24 need to be added with water and heated during stirring and mixing. The scheme leads the residual water and the residual steam in the steam-water recovery tank 17 into the slurry tank 24, and the residual water and the residual steam are mixed with the material to be heated, so that the residual water and the residual steam in the steam-water recovery tank 17 are reused, the energy waste is reduced, and the economic cost of adding water and heating the slurry tank 24 is saved.
The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The utility model provides a steam waste heat recovery utilizes system which characterized in that: the system comprises a primary waste heat collecting tank, a pre-curing chamber, a slurry tank, a middle steam exhaust pipeline arranged in the middle of a still kettle and a bottom pipeline arranged at the bottom of the still kettle, wherein the middle steam exhaust pipelines of all the still kettles are connected with a silencing steam exhaust pipeline; the bottom pipeline is provided with a steam exhaust outlet, the steam exhaust outlets of all the still kettles are communicated with a water-drainage steam exhaust pipeline, two ends of the water-drainage steam exhaust pipeline and two ends of the noise elimination steam exhaust pipeline are provided with silencers, and the water-drainage steam exhaust pipeline and the noise elimination steam exhaust pipeline which are positioned on the same side are communicated with a waste heat steam recovery collecting pipeline;
a first heat exchanger is arranged in the primary waste heat collecting tank, and a pipeline heat absorption and release facility is arranged in the pre-curing chamber; a first waste heat steam recovery pipeline control valve is arranged at the end part of one waste heat steam recovery manifold and communicated with a first waste heat steam recovery pipeline, and the first waste heat steam recovery pipeline is communicated with a first heat exchanger in the primary waste heat water collecting tank; a water outlet of the primary waste heat collecting tank is provided with a circulating pump which is communicated with the boiler through a pipeline; and the end part of the other waste heat steam recovery collecting pipeline is provided with a second waste heat steam recovery pipeline control valve and is communicated with a second waste heat steam recovery pipeline, and the second waste heat steam recovery pipeline is simultaneously communicated with the slurry tank and the heat absorption and release facilities of the pipelines of the pre-curing chamber.
2. The steam waste heat recycling system according to claim 1, wherein: the waste heat recovery device also comprises a secondary waste heat collecting tank, wherein a second heat exchanger is arranged in the secondary waste heat collecting tank; the first-stage waste heat collecting pool is provided with a first waste steam pipeline communicated with the first heat exchanger, and the first waste steam pipeline is communicated with a second heat exchanger in the second-stage waste heat collecting pool; and a water outlet of the secondary waste heat collecting tank is also provided with a circulating pump, and the circulating pump is communicated with the primary waste heat collecting tank through a pipeline.
3. The steam waste heat recycling system according to claim 2, wherein: the pre-curing chamber is provided with a second residual steam pipeline, and the second residual steam pipeline is merged with the first residual steam pipeline and then introduced into a second heat exchanger in the secondary waste heat water collecting tank.
4. The steam waste heat recycling system according to claim 3, wherein: and the secondary waste heat collecting tank is provided with a waste water and waste steam pipeline, one end of the waste water and waste steam pipeline is communicated with the second heat exchanger, and the other end of the waste water and waste steam pipeline is communicated with a steam-water recovery tank.
5. The steam waste heat recycling system according to claim 4, wherein: and the steam-water recovery tank is communicated with the slurry tank through a pipeline.
6. The steam waste heat recycling system according to claim 2, wherein: the first heat exchanger and the second heat exchanger are both coil type helical fin radiators.
7. The steam waste heat recycling system according to claim 2, wherein: and the secondary waste heat collecting tank is also provided with an overflow pipe, a blow-off pipe and a thermometer.
8. The steam waste heat recycling system according to claim 1, wherein: the pipeline heat absorption and heat release facility of the pre-curing chamber comprises a snakelike finned tube radiator, a plate type multi-tube finned tube radiator, a drain valve and a flow control valve for adjusting the steam flow in the pre-curing chamber.
9. The steam waste heat recycling system according to claim 1, wherein: the bottom pipeline is also provided with a drainage outlet, the drainage outlets of all the still kettles are communicated with a drainage pipeline, and the drainage pipeline is connected with a drainage water collecting tank.
10. The steam waste heat recycling system according to claim 1, wherein: the heat-insulating layer is arranged outside the primary waste heat collecting tank, and the overtemperature self-exhaust steam pipeline is arranged at the top of the primary waste heat collecting tank; a thermometer and a water level gauge are also arranged on the first-stage waste heat collecting tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021570592.8U CN212806691U (en) | 2020-07-31 | 2020-07-31 | Steam waste heat recycling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021570592.8U CN212806691U (en) | 2020-07-31 | 2020-07-31 | Steam waste heat recycling system |
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| Publication Number | Publication Date |
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| CN212806691U true CN212806691U (en) | 2021-03-26 |
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