CN203383865U - System for recycling boiler exhaust smoke waste heat based on screw expander - Google Patents
System for recycling boiler exhaust smoke waste heat based on screw expander Download PDFInfo
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- CN203383865U CN203383865U CN201320499526.XU CN201320499526U CN203383865U CN 203383865 U CN203383865 U CN 203383865U CN 201320499526 U CN201320499526 U CN 201320499526U CN 203383865 U CN203383865 U CN 203383865U
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- valve
- screw expander
- waste heat
- boiler exhaust
- exhaust gas
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Abstract
The utility model provides a system for recycling boiler exhaust smoke waste heat based on a screw expander. The system comprises a smoke heat exchanger arranged on a boiler flue, a pipeline pump set, a water taking electric regulating valve, a check valve, a manual stop valve, a condensate water pump and a condenser. A flow orifice plate, an emergency cut-off valve, a steam admission regulating valve and the screw expander are sequentially arranged in an outlet pipeline of the smoke heat exchanger. An outlet of the screw expander is connected to an inlet of the condenser through a steam exhaust valve, the screw expander drives an electric motor through a speed reducer, a recirculating pipeline is arranged between an outlet of the water taking electric regulating valve and the smoke heat exchanger, and a recirculating electric regulating valve set is arranged in the recirculating pipeline. According to the system for recycling the boiler exhaust smoke waste heat based on the screw expander, the boiler exhaust smoke waste heat is absorbed through condensate water, an electric generator is driven by the screw expander to convert low-quality heat energy into electric energy, and therefore the aim of saving energy is achieved.
Description
Technical field
The utility model is about a kind of heat recovery device, relates in particular to a kind of system of the recycling boiler exhaust gas waste heat based on screw expander.
Background technique
The primary energy current resources situation of China allows of no optimist, although coal resources reserves world rankings second (U.S. the first is a times of China's reserves), the minable coal resources of China are not enough the century-old time, far fewer than world first six digits coal storage quantity country; The oil and natural gas resource of China is also only enough exploited decades, also shortage within this century of worldwide petroleum resources exploitation.
Past 20 years China the energy-output ratio rapid growth, China in 1993 as energy net importer after, energy breach is increasing, along with the expanding day of economic scale, energy demand rapidly increases.Yet the energy utilization rate level of China is but very low, according to the specific energy consumption wound output value, the energy consumption index of China is 5 times of whole world average level; 15.5 times of Japanese energy consumption; Connect the such populous nation of India, the energy consumption of China is also her 2 times.This surprising situation wasted energy, cause the flood tide consumption of predatory energy resources, and its result will cause permanent impact to China's environment and ecology, may become the heavy burden of China next generation or lower several generations.So the problem of solution China's energy shortage and energy resource structure, become the strategic large problem that affects China's sustainable development and national security.
From the resource of the fifth-largest energy, the waste of high-grade energy is limited, because can reclaim preferably and utilize by existing technology; Waste is low-grade energy in a large number.Low-grade energy refers to low temperature, low pressure, unsettled heat energy, account for always waste energy 70%～80%, even more.Low-grade energy generally all exists with forms such as steam, steam water interface, hot water, or other forms convert this form existence to by heat exchanger.How high efficiente callback low-grade energy change into high-grade energy (as electric energy), be the very large technical barrier that industrial energy saving faces.
The existing power engine that thermal power transfer is become to mechanical energy or electric energy, mainly contain the combustion engine (petrol engine, diesel engine and gas turbine) of combustion oil, gas and utilize the steam turbine of steam red switch.Low-grade energy generally all exists with forms such as steam, steam water interface, hot water, or other forms convert this form to by heat exchanger and exist, thereby the equipment that reclaims low-grade energy mainly be take steam turbine as main.According to the technical characterstic of steam turbine, it can only be applicable to superheated vapor, clean steam and steam flow and the metastable thermal source situation of parameter, and the Personnel Skill Levels of equipment requirement and maintenance condition are all very high.This technical characterstic, make steam turbine mostly be suitable for the electricity power enterprise with basic load, can't be applied in the recycling of a large amount of low grade residual heat used heat of existing industry.
Screw expander is a kind of low grade heat energy power engine, and it can reclaim low grade heat energy and be directly changed into electric energy or directly drive other machine acting, is a kind of new power machine in current field of energy utilization important breakthrough.Screw expander has three very important technical characterstics: 1) thermal source accommodation is very broad: go for the thermoelectricity conversion of the various low-grade heat sources of superheated vapor, saturated vapour, steam water interface, hot water and high salt concentration, belong to unique heat power machine that possesses advantage like this in the world.2) variable working condition ability is very superior: in the situation that (from 120% to 10% scope) variation fluctuation on a large scale of thermal source load and parameter, not only stable and reliable operation, and high efficiency smooth.3) maintenance cost and operation technique threshold are very low: belong to 10 years power engines without overhaul, light maintenance maintenance and operation are all simple and convenient, and user's original system is not produced to interference effect, install and move very simple and easy.At electric power enterprise especially in cogeneration of heat and power enterprise, there is the energy of the used heat (as platoon water discharges) of energy recovery and the discharge of many pressure and temperature reducing steam throttling losses to reclaim, can apply screw expansion motor and generate electricity or drag load, thereby effectively reduce station service power consumption rate.
In power plant, the thermal loss that the exhaust gas temperature height causes is one maximum in the boiler various heat losses, accounts for 70%～80%.And, in China, large quantities of design temperatures are higher, the boiler operatiopn unit that working time is longer, temperature of exhaust fume is even up to 200 ℃ of left and right, and the temperature of exhaust fume of general boiler is 120 ℃～140 ℃ left and right.As can be seen here, by technological means decrease exhaust gas temperature, with screw expander, recycle the boiler exhaust gas waste heat, thereby reduction Power Plant hear rate and standard coal consumption level are very considerable.
Thus, the inventor, by means of being engaged in experience and the practice of relevant industries for many years, proposes a kind of system of the recycling boiler exhaust gas waste heat based on screw expander, to overcome the defect of prior art.
The model utility content
The purpose of this utility model is to provide a kind of system of the recycling boiler exhaust gas waste heat based on screw expander, draw a part of water of condensation and enter the boiler exhaust gas pipeline, absorb the heat of waste heat flue gas, when reducing exhaust gas temperature, obtained again a part of low grade heat energy, again the heated water of condensation of this part or vapour are introduced to the generating of screw expander drive generator, the screw expander steam discharge enters vapour condenser, thereby it is energy-conservation effectively to utilize the boiler exhaust gas waste heat to carry out.
The purpose of this utility model is to realize like this, a kind of system of the recycling boiler exhaust gas waste heat based on screw expander, described system includes the flue gas heat-exchange unit be arranged on boiler flue, is provided with successively pipeline mounted pump group, water intaking electric control valve, check valve, hand stop valve, condensate pump and vapour condenser in described flue gas heat-exchange unit inlet ductwork; Be provided with successively flow orifice plate, fast valve, admission modulating valve and screw expander in described flue gas heat-exchange unit export pipeline; The outlet of described screw expander is connected in the entrance of described vapour condenser by exhaust steam valve; Described screw expander is by the deceleration machine driving generator; Be provided with recirculating line between described water intaking motorized adjustment valve outlet port and the outlet of described flue gas heat-exchange unit, be provided with recirculation electric adjustable valve group in this recirculating line.
In a better embodiment of the present utility model, described pipeline mounted pump group is comprised of mortor operated valve, outlet manually operated valve, pipeline mounted pump and the entrance manually operated valve of series connection.
In a better embodiment of the present utility model, described pipeline mounted pump group one side also parallel connection be provided with a backup line pump group.
In a better embodiment of the present utility model, described recirculation electric adjustable valve group consists of the manually operated valve of an electric adjustable valve and two ends series connection thereof.
In a better embodiment of the present utility model, the one side parallel connection of described recirculation electric adjustable valve group is provided with a bypass, is provided with a manually operated valve in this bypass.
In a better embodiment of the present utility model, at the entry end of flow orifice plate, also be provided with safety valve, pressure gauge and thermometer; Outlet end at described screw expander is provided with pressure gauge.
In a better embodiment of the present utility model, between described hand stop valve and condensate pump, be provided with precision processing device of condensation water.
In a better embodiment of the present utility model, be provided with conducting in the pipeline of low-pressure heater between described hand stop valve and precision processing device of condensation water.
From the above mentioned, the system of the recycling boiler exhaust gas waste heat of the utility model based on screw expander, by condensed water absorption boiler smoke smoke discharging residual heat, and convert this part low grade heat energy to electric energy by the screw expansion machine driving generator, reach thus the purpose of energy saving.In the technical program, the part water of condensation provided by condensate pump, enter the pipeline mounted pump group via hand stop valve, check valve, water intaking electric control valve, adherence pressure enters absorption boiler smoke discharging residual heat in boiler smoke heat exchanger, enter screw expander through flow orifice plate, fast valve and admission modulating valve afterwards, to drive generator acting generating, screw expander finally enters fluid (gas) in vapour condenser by exhaust steam valve.
The accompanying drawing explanation
The following drawings only is intended to the utility model is done and schematically illustrated and explain, does not limit scope of the present utility model.Wherein:
Fig. 1: the system architecture schematic diagram of the recycling boiler exhaust gas waste heat for the utility model based on screw expander.
Embodiment
Understand for technical characteristics of the present utility model, purpose and effect being had more clearly, now contrast accompanying drawing embodiment of the present utility model is described.
As shown in Figure 1, the utility model proposes a kind of system 100 of the recycling boiler exhaust gas waste heat based on screw expander, described system 100 includes the flue gas heat-exchange unit 1 be arranged on boiler flue 9, in the present embodiment, flue gas in described boiler flue 9 is mobile (as shown in arrow in Fig. 1 flue) from top to bottom, the entrance point of described flue gas heat-exchange unit 1 under, outlet end is upper; Be provided with successively pipeline mounted pump group 2, water intaking electric control valve 3, check valve 41, hand stop valve 42, condensate pump 51 and vapour condenser 52 in described flue gas heat-exchange unit 1 inlet ductwork 11; Be provided with successively flow orifice plate 121, fast valve 122, admission modulating valve 123 and screw expander 6 in described flue gas heat-exchange unit 1 export pipeline 12; The outlet of described screw expander 6 is connected in the entrance of described vapour condenser 52 by exhaust steam valve 53; Described screw expander 6 drives generator 62 by speed reducer 61; Be provided with recirculating line 13 between described water intaking electric control valve 3 outlets and 1 outlet of described flue gas heat-exchange unit, be provided with recirculation electric adjustable valve group 7 in this recirculating line 13.
From the above mentioned, the system of the recycling boiler exhaust gas waste heat of the utility model based on screw expander, by condensed water absorption boiler smoke smoke discharging residual heat, and convert this part low grade heat energy to electric energy by the screw expansion machine driving generator, reach thus the purpose of energy saving.In the technical program, the part water of condensation provided by condensate pump, enter the pipeline mounted pump group via hand stop valve, check valve, water intaking electric control valve, adherence pressure enters absorption boiler smoke discharging residual heat in boiler smoke heat exchanger, enter screw expander (as shown in the flow direction of fluid arrow as ducted as Fig. 1) through flow orifice plate, fast valve and admission modulating valve afterwards, to drive generator acting generating, screw expander finally enters fluid (gas) in vapour condenser by exhaust steam valve.
In the present embodiment, described pipeline mounted pump group 2 is comprised of mortor operated valve 24, outlet manually operated valve 23, pipeline mounted pump 21 and the entrance manually operated valve 22 of series connection, by the pipeline mounted pump group, is promoted water of condensation pressure and water of condensation is delivered in flue gas heat-exchange unit; Described pipeline mounted pump group 2 one sides also parallel connection be provided with a backup line pump group (as shown in Figure 1); When pipeline mounted pump group 2 breaks down, backup line pump group can maintain the normal operation of this system.Water intaking electric control valve 3, check valve 41, hand stop valve 42 that the pipeline pump inlet arranges can prevent its refluence in isolated water of condensation.
In the present embodiment, can automatically regulate the condensing capacity of the flue gas heat-exchange unit 1 of flowing through by the temperature of exhaust fume measuring point (not shown) of water intaking electric control valve 3 and boiler flue smoke outlet.Water intaking electric control valve 3 is electric valves, regulates its aperture and just can regulate the condensing capacity of the system of entering.As shown in Figure 1, the water of condensation of this water intaking electric control valve 3 of process is flow ipe pump group successively, enters flue gas heat-exchange unit 1 absorption boiler smoke discharging residual heat after adherence pressure, and then to screw expander 6 actings.The increase and decrease of condensing capacity, must have influence on the number of absorption boiler smoke exhaust heat, and then must affect the variation of exhaust gas temperature.In the Power Plant Thermal Process logic, take the exhaust gas temperature measuring point as feedback, automatically control the aperture of this water intaking electric control valve valve.Temperature of exhaust fume is low, just shows that condensing capacity is large, and that just closes a little bit smaller this valve; High fume temperature, just show that condensing capacity is little, and that just opens large a bit this valve; Finally by this valve, maintain the stability of temperature of exhaust fume.
Further, in the present embodiment, the effect of described recirculating line 13 and recirculation electric adjustable valve group 7 thereof is to adjust the condensing water temperature of flue gas heat-exchange unit entrance at this system initial stage of startup; Described recirculation electric adjustable valve group 7 consists of the manually operated valve 72,73 of an electric adjustable valve 71 and two ends series connection thereof.The 7 one side parallel connections of described recirculation electric adjustable valve group are provided with a bypass, are provided with a manually operated valve 74 in this bypass.When normal operation, manually operated valve 74 is in closed condition, manually operated valve 72 and manually operated valve 73 are in opening state, after water intaking electric control valve 3 is opened, by controlling the aperture of electric adjustable valve 71, can control the flow of water of condensation in recirculating line, and the water of condensation of this strand of recirculating line is hot water out through flue gas heat-exchange unit 1, enter the pipeline mounted pump group after the low-temperature condensate that it is carried with water intaking electric control valve 3 mixes, then enter successively flue gas heat-exchange unit 1 heat exchange; Adjust the flow of this strand of hot water, just can regulate the condensing water temperature that enters the pipeline mounted pump group.Moreover, the angle of this system of stopping transport, in the stoppage in transit screw expander, will inevitably contract fully entering the valve of screw expander, this just causes the main road system pipeline normally to move; During this time, recirculating line just plays the effect that maintains the normal operation of pipeline mounted pump group.
In the present embodiment, the inlet/outlet end of flue gas heat-exchange unit 1 is respectively equipped with a manual separating valve, for isolating water of condensation turnover flue gas heat-exchange unit.
Entry end at flow orifice plate 121 also is provided with safety valve 124, pressure gauge 125 and thermometer 126; Outlet end at described screw expander 6 also is provided with pressure gauge 127.
Further, as shown in Figure 1, in the present embodiment, between described hand stop valve 42 and condensate pump 51, connect and be provided with precision processing device of condensation water 7; This precision processing device of condensation water 7 is a kind of chemical purifying devices on the existing condensing water conduit of power plant, and its major function is to remove impurity in water of condensation, salinity etc., allows the water quality of condensing reach power plant's necessary requirement.Be provided with conducting in the pipeline of low-pressure heater 8 between described hand stop valve 42 and precision processing device of condensation water 7.
The utlity model has following beneficial effect:
1, the utility model is recycled the screw expander of boiler exhaust gas waste heat, go for the thermoelectricity conversion of the various low-grade heat sources of superheated vapor, saturated vapour, steam water interface, hot water and high salt concentration, can directly utilize the generating of doing work of the water of condensation of absorption boiler smoke discharging residual heat.
2, the utility model, when recycling the boiler exhaust gas waste heat, has significantly reduced exhaust gas temperature; Reducing temperature of exhaust fume pollutes and has important practical significance for fuel saving, reduction.
3, in the utility model, the water flow of flue gas heat-exchange unit can be regulated, thereby can the adjutage wall temperature, has good load adaptability, therefore has good coal and seasonal adaptation.
The foregoing is only the schematic embodiment of the utility model, not in order to limit scope of the present utility model.Any those skilled in the art, the equivalent variations of having done under the prerequisite that does not break away from design of the present utility model and principle and modification, all should belong to the scope that the utility model is protected.
Claims (8)
1. the system of the recycling boiler exhaust gas waste heat based on screw expander, it is characterized in that: described system includes the flue gas heat-exchange unit be arranged on boiler flue, is provided with successively pipeline mounted pump group, water intaking electric control valve, check valve, hand stop valve, condensate pump and vapour condenser in described flue gas heat-exchange unit inlet ductwork; Be provided with successively flow orifice plate, fast valve, admission modulating valve and screw expander in described flue gas heat-exchange unit export pipeline; The outlet of described screw expander is connected in the entrance of described vapour condenser by exhaust steam valve; Described screw expander is by the deceleration machine driving generator; Be provided with recirculating line between described water intaking motorized adjustment valve outlet port and the outlet of described flue gas heat-exchange unit, be provided with recirculation electric adjustable valve group in this recirculating line.
2. the system of the recycling boiler exhaust gas waste heat based on screw expander as claimed in claim 1 is characterized in that: described pipeline mounted pump group is comprised of mortor operated valve, outlet manually operated valve, pipeline mounted pump and the entrance manually operated valve of series connection.
3. the system of the recycling boiler exhaust gas waste heat based on screw expander as claimed in claim 2 is characterized in that: described pipeline mounted pump group one side also parallel connection be provided with a backup line pump group.
4. the system of the recycling boiler exhaust gas waste heat based on screw expander as claimed in claim 1 is characterized in that: described recirculation electric adjustable valve group consists of the manually operated valve of an electric adjustable valve and two ends series connection thereof.
5. the system of the recycling boiler exhaust gas waste heat based on screw expander as claimed in claim 4, it is characterized in that: the one side parallel connection of described recirculation electric adjustable valve group is provided with a bypass, is provided with a manually operated valve in this bypass.
6. the system of the recycling boiler exhaust gas waste heat based on screw expander as claimed in claim 1, it is characterized in that: the entry end at flow orifice plate also is provided with safety valve, pressure gauge and thermometer; Outlet end at described screw expander is provided with pressure gauge.
7. the system of the recycling boiler exhaust gas waste heat based on screw expander as claimed in claim 1, is characterized in that: between described hand stop valve and condensate pump, be provided with precision processing device of condensation water.
8. the system of the recycling boiler exhaust gas waste heat based on screw expander as claimed in claim 7, is characterized in that: be provided with conducting in the pipeline of low-pressure heater between described hand stop valve and precision processing device of condensation water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320499526.XU CN203383865U (en) | 2013-08-15 | 2013-08-15 | System for recycling boiler exhaust smoke waste heat based on screw expander |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320499526.XU CN203383865U (en) | 2013-08-15 | 2013-08-15 | System for recycling boiler exhaust smoke waste heat based on screw expander |
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| CN203383865U true CN203383865U (en) | 2014-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320499526.XU Expired - Lifetime CN203383865U (en) | 2013-08-15 | 2013-08-15 | System for recycling boiler exhaust smoke waste heat based on screw expander |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207014A (en) * | 2019-06-05 | 2019-09-06 | 大唐郓城发电有限公司 | A kind of protection system and operating method preventing condensate pump entrance superpressure |
-
2013
- 2013-08-15 CN CN201320499526.XU patent/CN203383865U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207014A (en) * | 2019-06-05 | 2019-09-06 | 大唐郓城发电有限公司 | A kind of protection system and operating method preventing condensate pump entrance superpressure |
| CN110207014B (en) * | 2019-06-05 | 2020-09-01 | 大唐郓城发电有限公司 | Protection system for preventing overpressure at inlet of condensate pump and operation method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140108 |
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| CX01 | Expiry of patent term |