CN103256756A - Chemical industry device circulating water cooling, low-grade heat energy utilization and water saving system and method - Google Patents
Chemical industry device circulating water cooling, low-grade heat energy utilization and water saving system and method Download PDFInfo
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Abstract
Disclosed is a chemical industry device circulating water cooling, low-grade heat energy utilization and water saving system and method. The chemical industry device circulating water cooling, low-grade heat energy utilization and water saving system and method relates to three cycles, wherein the first cycle is that hot circulating water of a chemical industry device is conveyed to an evaporator (5) of a heat pump system from the output end of a water cooler (1), heat is transmitted to a liquid-state heating medium to vaporize the heating medium; the second cycle is that the vaporized heating medium in the evaporator (5) is conveyed to a compressor (6), the temperature difference of the heating medium is increased and the heating medium is heated through the compressor (6), and then the heating medium is conveyed to a condenser (7) of the heat pump system, heat transfer is conducted on the heating medium and low-temperature heating water conveyed by heating equipment, and the heating medium is condensed; the third cycle is that the low-temperature heating water conveyed to the condenser (7) from the heating equipment through a pipeline is conveyed to the heating equipment through the pipeline after being heated by the vaporized heating medium. According to the chemical industry device circulating water cooling, low-grade heat energy utilization and water saving system and method, the defects in the prior art are overcome, cost of cooling circulating water is reduced, utilization efficiency of low-grade heat energy is improved, energy is saved, and emission is reduced.
Description
Technical field
The present invention relates to the utilization of circulating water cooling and low grade heat energy, chemical plant installations circulating water cooling and low grade heat energy utilization and water-saving system and method are provided especially.
Background technology
In the actual Chemical Manufacture, have a large amount of recirculated water using, and quantity of circulating water is very big.Usually, what these recirculated waters were entrained all is low grade heat energy, temperature is about 30-40 ℃, generally all be in cooling tower by with cross-ventilation, part water is evaporated in the air and convection heat transfer' heat-transfer by convection makes water for cooling, the convection current of air, the employing free convection mode that has, having plenty of by the fan that is installed in cat head provides, and consumes a large amount of electric energy.Evaporation of water has lost a large amount of precious water resource, and the entrained tow taste heat of recirculated water is brought in the environment simultaneously, has caused the serious wasting of resources.
Suppose certain chemical plant installations, its quantity of circulating water be 10000 tons/time, 20 ℃ in last water, 30 ℃ in backwater, the temperature difference is 10 ℃, the thermal capacitance 1kcal/ of water (kg ℃), the thermic load of its recirculated water be 10000 tons/time * 1000kg/ ton * 1kcal/ (kg ℃) * 10 ℃=1*10
8During kcal/, be equivalent to 1.16*10
5Kw, such thermic load is very common at chemical plant installations.And for discharge these caloric requirement moisture evaporated normally quantity of circulating water 1.5%, be equivalent to 150 tons/time, simultaneously, because evaporation, the salinity in the water constantly concentrate, the part water of also need draining is to discharge salinity, suppose that cycles of concentration is 4, the water yield that then needs to discharge again be 50 tons/time.If adopt non-evaporated form to reduce circulating water temperature, then this part 150+50 ton/time water can be saved.Simultaneously, if adopt other method to reduce circulating water temperature, the blower fan of cooling tower 2 top coolings also can be stopped transport, corresponding this part electric energy of having saved, and corresponding electrical power is 500kw.
Therefore, how to improve the utilization ratio of low grade heat energy, energy-saving and emission-reduction have become this area problem demanding prompt solution
Summary of the invention
In view of this, the invention provides a kind of chemical plant installations circulating water cooling and low grade heat energy utilization and water-saving system and method, overcome the deficiencies in the prior art, reduced the cost of circulating water cooling, improved the utilization ratio of low grade heat energy, energy-saving and emission-reduction.
The technical solution adopted for the present invention to solve the technical problems is chemical plant installations circulating water cooling and low grade heat energy utilization and water-saving method, comprises three circulations:
First circulation is the circulation of chemical plant installations recirculated water: the recirculated water of the heat of chemical plant installations is transported to the evaporimeter 5 of heat pump from the output of water cooler 1 by pipeline, with the liquid heating agent of heat transferred, makes the heating agent vaporization; The recirculated water of heat through evaporimeter 5 with the liquid heating agent of heat transferred after, self temperature reduces, be transported to cooling tower 2 tops from the evaporimeter 5 of heat pump by pipeline, be transported to each water cooler 1 of chemical plant installations by cooling tower 2 bottoms by pipeline again, finish the circulation of chemical plant installations recirculated water;
Second circulation is the circulation of the heating agent of heat pump: the heating agent of vaporization is transported to compressor 6 in the evaporimeter 5, promoting potential temperature through compressor 6 heats, be transported to the condenser 7 of heat pump then, with carry the low temperature heating water heat exchange condensation of returning from heating equipment, the heating agent liquefy of vaporization, carry back evaporimeter 5 by pressure-reducing valve 8 again, finish the circulation of heating agent;
The 3rd circulation is the circulation of heating water: be transported to the low temperature heating water of condenser 7 from heating equipment by pipeline, after the heating agent that the is vaporized heating, flow to heating equipment by pipeline again, finish the circulation of heating water;
Adopt the advantage of such scheme to be, in the time can not normally using the heating circulation as the chemical plant installations circulating water cooling, can use cooling tower to lower the temperature.
Chemical plant installations circulating water cooling of the present invention and low grade heat energy utilization and water-saving method, also can adopt following method to realize that described method comprises three circulations:
First circulation is the circulation of chemical plant installations recirculated water: the recirculated water of the heat of chemical plant installations is transported to the evaporimeter 5 of heat pump from the output of water cooler 1 by pipeline, with the liquid heating agent of heat transferred, makes the heating agent vaporization; The recirculated water of heat through evaporimeter 5 with the liquid heating agent of heat transferred after, self temperature reduces, and is transported to each water cooler 1 of chemical plant installations from the evaporimeter 5 of heat pump by pipeline, finishes the circulation of chemical plant installations recirculated water;
Second circulation is the circulation of the heating agent of heat pump: the heating agent of vaporization is transported to compressor 6 in the evaporimeter 5, promoting potential temperature through compressor 6 heats, be transported to the condenser 7 of heat pump then, with carry the low temperature heating water heat exchange condensation of returning from heating equipment, the heating agent liquefy of vaporization, carry back evaporimeter 5 by pressure-reducing valve 8 again, finish the circulation of heating agent;
The 3rd circulation is the circulation of heating water: be transported to the low temperature heating water of condenser 7 from heating equipment by pipeline, after the heating agent that the is vaporized heating, flow to heating equipment by pipeline again, finish the circulation of heating water.
Chemical plant installations circulating water cooling of the present invention and low grade heat energy utilization and water-saving method, wherein, the heating agent circulation of described chemical industry recirculated water circulation, heat pump, the circulation of heating water are to isolate mutually.
Chemical plant installations circulating water cooling of the present invention and low grade heat energy utilization and water-saving system, wherein,
Each heat pump 3 of described heat pump includes evaporimeter 5, compressor 6, condenser 7;
Wherein, described water cooler 1 output is connected with evaporimeter 5 inputs of heat pump 3 in the heat pump by pipeline, and evaporimeter 5 outputs of heat pump 3 are connected with cooling tower 2 tops by pipeline, and cooling tower 2 bottoms are connected with water cooler 1 by pipeline;
The output of the condenser 7 of heat pump 3 is connected with the input of heating system by pipeline in the described heat pump; The output of described heating system is connected with the input of condenser 7.
Chemical plant installations circulating water cooling of the present invention and low grade heat energy utilization and water-saving system, wherein,
Described device comprises water cooler 1, heat pump, heating system 4;
Each heat pump 3 of described heat pump includes evaporimeter 5, compressor 6, condenser 7;
Wherein, described water cooler 1 output is connected with evaporimeter 5 inputs of heat pump 3 in the heat pump by pipeline, and evaporimeter 5 outputs of heat pump 3 are connected with water cooler 1 by pipeline;
The output of the condenser 7 of heat pump 3 is connected with the input of heating system by pipeline in the described heat pump; The output of described heating system is connected with the input of condenser 7.
Chemical plant installations circulating water cooling of the present invention and low grade heat energy utilization and water-saving system, wherein, described heat pump comprises at least one heat pump 3.
Chemical plant installations circulating water cooling of the present invention and low grade heat energy utilization and water-saving system, wherein,
When described heat pump comprised the above heat pump 3 of Liang Tai and two, the formation heat pump was connected in parallel between each heat pump 3;
Described heat pump and water cooler 1, heating system 4 are connected in series.
Chemical plant installations circulating water cooling of the present invention and low grade heat energy utilization and water-saving system, wherein,
When described heat pump comprised the above heat pump 3 of Liang Tai and two, each heat pump 3 was earlier with after different heating systems 4 are connected in series, parallel connection again.
Chemical plant installations circulating water cooling of the present invention and low grade heat energy utilization and water-saving system, wherein,
Described evaporimeter 5 is connected with condenser 7 with second channel 10 by first passage 9;
Described first passage 9 is for delivery of the heating agent of vaporization; Described second channel 10 is for delivery of the heating agent of liquid state;
Described first passage 9 refers to that evaporimeter 5 upper ends are connected with compressor 6, the passage that compressor 6 is connected with condenser 7 upper ends;
Described second channel 10 refers to the passage that condenser 7 lower ends are connected with evaporimeter 5 lower ends; Described second channel 10 is provided with pressure-reducing valve 8.
Chemical plant installations circulating water cooling of the present invention and low grade heat energy utilization and water-saving system and method, the recirculated water that carries low grade heat energy of chemical plant installations output, traditional approach is to lower the temperature by the mode of cooling tower 2, can cause a large amount of energy wastes like this, adopt chemical plant installations circulating water cooling of the present invention and low grade heat energy utilization and water-saving system and method, the recirculated water that carries low grade heat energy of chemical plant installations output is input in the civilian heating equipment, process by circulating water cooling provides heat for heating equipment, improved the utilization ratio of low grade heat energy, save the cooling cost of chemical plant installations recirculated water, realized energy-saving and emission-reduction.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the circulating water cooling schematic diagram for chemical plant installations;
Fig. 2 is heating equipment heating schematic diagram;
Fig. 3 is chemical plant installations circulating water cooling and low grade heat energy utilization and water-saving system schematic diagram;
Fig. 4 is for adopting chemical plant installations circulating water cooling and low grade heat energy utilization and the water-saving system schematic diagram of two heat pumps.
Wherein, 11-boiler; The 12-blower fan.
The specific embodiment
The invention provides chemical plant installations circulating water cooling and low grade heat energy utilization and water-saving system and method, overcome the deficiencies in the prior art, reduced the cost of circulating water cooling, improved the utilization ratio of low grade heat energy, energy-saving and emission-reduction
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Please refer to Fig. 1,2,3,4, Fig. 1 is the circulating water cooling schematic diagram for chemical plant installations; Fig. 2 is heating equipment heating schematic diagram; Fig. 3 is chemical plant installations circulating water cooling and low grade heat energy utilization and water-saving system schematic diagram; Fig. 4 is for adopting chemical plant installations circulating water cooling and low grade heat energy utilization and the water-saving system schematic diagram of two heat pumps 3.
The described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving method comprise three circulations:
First circulation is the circulation of chemical plant installations recirculated water: the recirculated water of the heat of chemical plant installations is transported to the evaporimeter 5 of heat pump from the output of water cooler 1 by pipeline, with the liquid heating agent of heat transferred, makes the heating agent vaporization; The recirculated water of heat through evaporimeter 5 with the liquid heating agent of heat transferred after, self temperature reduces, be transported to cooling tower 2 tops from the evaporimeter 5 of heat pump by pipeline, be transported to each water cooler 1 of chemical plant installations by cooling tower 2 bottoms by pipeline again, finish the circulation of chemical plant installations recirculated water;
Second circulation is the circulation of the heating agent of heat pump: the heating agent of vaporization is transported to compressor 6 in the evaporimeter 5, promoting potential temperature through compressor 6 heats, be transported to the condenser 7 of heat pump then, with carry the low temperature heating water heat exchange condensation of returning from heating equipment, the heating agent liquefy of vaporization, carry back evaporimeter 5 by pressure-reducing valve 8 again, finish the circulation of heating agent;
The 3rd circulation is the circulation of heating water: be transported to the low temperature heating water of condenser 7 from heating equipment by pipeline, after the heating agent that the is vaporized heating, flow to heating equipment by pipeline again, finish the circulation of heating water; Adopt the advantage of such scheme to be, in the time can not normally using the heating circulation as the chemical plant installations circulating water cooling, can use cooling tower to lower the temperature.
The described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving method, also can adopt following method to realize that described method comprises three circulations:
First circulation is the circulation of chemical plant installations recirculated water: the recirculated water of the heat of chemical plant installations is transported to the evaporimeter 5 of heat pump from the output of water cooler 1 by pipeline, with the liquid heating agent of heat transferred, makes the heating agent vaporization; The recirculated water of heat through evaporimeter 5 with the liquid heating agent of heat transferred after, self temperature reduces, and is transported to each water cooler 1 of chemical plant installations from the evaporimeter 5 of heat pump by pipeline, finishes the circulation of chemical plant installations recirculated water;
Second circulation is the circulation of the heating agent of heat pump: the heating agent of vaporization is transported to compressor 6 in the evaporimeter 5, promoting potential temperature through compressor 6 heats, be transported to the condenser 7 of heat pump then, with carry the low temperature heating water heat exchange condensation of returning from heating equipment, the heating agent liquefy of vaporization, carry back evaporimeter 5 by pressure-reducing valve 8 again, finish the circulation of heating agent;
The 3rd circulation is the circulation of heating water: be transported to the low temperature heating water of condenser 7 from heating equipment by pipeline, after the heating agent that the is vaporized heating, flow to heating equipment by pipeline again, finish the circulation of heating water.
Further, the described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving method, wherein, the heating agent circulation of described chemical industry recirculated water circulation, heat pump, the circulation of heating water are to isolate mutually.
Further, the described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving system, wherein,
Each heat pump 3 of described heat pump includes evaporimeter 5, compressor 6, condenser 7;
Wherein, described water cooler 1 output is connected with evaporimeter 5 inputs of heat pump 3 in the heat pump by pipeline, and evaporimeter 5 outputs of heat pump 3 are connected with cooling tower 2 tops by pipeline, and cooling tower 2 bottoms are connected with water cooler 1 by pipeline;
The output of the condenser 7 of heat pump 3 is connected with the input of heating system by pipeline in the described heat pump; The output of described heating system is connected with the input of condenser 7.
In addition, present embodiment also can adopt chemical plant installations circulating water cooling as described below and low grade heat energy utilization and water-saving system, wherein,
Described device comprises water cooler 1, heat pump, heating system 4;
Each heat pump 3 of described heat pump includes evaporimeter 5, compressor 6, condenser 7;
Wherein, described water cooler 1 output is connected with evaporimeter 5 inputs of heat pump 3 in the heat pump by pipeline, and evaporimeter 5 outputs of heat pump 3 are connected with water cooler 1 by pipeline;
The output of the condenser 7 of heat pump 3 is connected with the input of heating system by pipeline in the described heat pump; The output of described heating system is connected with the input of condenser 7.
The described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving system, wherein, described heat pump comprises at least one heat pump 3.
In addition, the described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving system, wherein, when described heat pump comprised the above heat pump 3 of Liang Tai and two, the formation heat pump was connected in parallel between each heat pump 3;
Described heat pump and water cooler 1, heating system 4 are connected in series.
The described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving system, also can adopt following structure, when described heat pump comprised the above heat pump 3 of Liang Tai and two, each heat pump 3 was earlier with after different heating systems 4 are connected in series, parallel connection again.
Further, the described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving system, wherein,
Described evaporimeter 5 is connected with condenser 7 with second channel 10 by first passage 9;
Described first passage 9 is for delivery of the heating agent of vaporization; Described second channel 10 is for delivery of the heating agent of liquid state;
Described first passage 9 refers to that evaporimeter 5 upper ends are connected with compressor 6, the passage that compressor 6 is connected with condenser 7 upper ends;
Described second channel 10 refers to the passage that condenser 7 lower ends are connected with evaporimeter 5 lower ends; Described second channel 10 is provided with pressure-reducing valve 8.Come more various heating systems with the standard coal index that the unit heating area unit interval needs, the calculating standard is as follows: 1kg mark coal is equivalent to the 7000kcal lower calorific value; The heat-only boilers thermal efficiency is 70%; Cogeneration of heat and power boiler overall thermal efficiency is 60%, and thermoelectricity compares 2:1; The COP value was 3 when common air-conditioning heated; The COP value of heat pump is 4; Every 1kwh electric energy needs combustion standard coal 0.34kg, every square metre of area heat load 50W.
When adopting the low grade heat energy heating of chemical plant installations recirculated water:
In the time need extracting the heat of 3kw from recirculated water, the power consumption of heat pump 3 is 1kw, and the COP when needing mark coal 0.34kg to heat because of it is 4, and the heat energy of 3+1kw can be provided for the heating family altogether, can be 80 m
2The area heating; Amount to every square meter and per hour use standard coal 4.25g.
Comparative Examples one: adopt the heat-only boilers heating
Wherein, the standard coal during 0.879kg/ is equivalent to the heat energy of 7.14kw, and the thermal efficiency of pure heat boiler is 70%, therefore can produce the heat energy of 5kw7.14kw * 70%, can be 100 m
2The area heating; Amount to every square meter and per hour use standard coal 8.79g.
Comparative Examples two: adopt the cogeneration of heat and power boiler heating
Wherein, the standard coal during 0.615kg/, thermoelectric than 2:1, therefore can produce the energy of 3kw, the heat energy of 2kw wherein, the electric energy of 1kw; Standard coal calculates when pressing 1kw power consumption 0.34kg/, that is to say the heat exhaustion 0.615-0.34kg/ markers coal of residue 2kw, and the heat energy of 2kw can be 40 m
2The area heating is amounted to every square meter and is per hour used standard coal 6.88g.
Table 1 be in above-mentioned 3 heat-supplying mode with the standard coal amount relatively.
Table 1
| ? | Every square meter per hour consumes standard coal (unit: g) |
| The heating of employing heat-only boilers | 8.79 |
| Adopt the cogeneration of heat and power boiler heating | 6.88 |
| The low grade heat energy heating of chemical plant installations recirculated water | 4.25 |
By more as can be known, under the situation that reaches identical heating standard, adopt the low grade heat energy heating of chemical plant installations recirculated water, the standard coal that every square meter per hour consumes only is 4.25g, than adopting heat-only boilers every square meter that heats per hour to save 4.54g, than adopting the every square meter of cogeneration of heat and power boiler heating per hour to save 2.63g.
The described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving system and method will be drawn its low grade heat energy by the heat pump technology from the recirculated water that carries low grade heat energy of chemical plant installations output, make it cooling, recycle.Improve by heat pump low grade heat energy that recirculated water is entrained and to become high-grade heat energy behind the potential temperature and heat for the resident.Concerning recirculated water, removed to reducing the electric energy of cooling blower that circulating water temperature is opened, and lower the temperature by heat pump, no longer need to evaporate big water gaging, so saved the big water gaging that conventional method evaporates, simultaneously because recirculated water does not need evaporation, just do not need to concentrate again, salinity is discharged in blowdown again, so sewer is also saved yet; Concerning heating, saved for this reason and a large amount of fossil fuels of burning.
The described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving method comprise three circulations:
First circulation is the circulation of chemical plant installations recirculated water: the recirculated water of the heat of chemical plant installations is transported to the evaporimeter 5 of heat pump from the output of water cooler 1 by pipeline, with the liquid heating agent of heat transferred, makes the heating agent vaporization; The recirculated water of heat through evaporimeter 5 with the liquid heating agent of heat transferred after, self temperature reduces, be transported to cooling tower 2 tops from the evaporimeter 5 of heat pump by pipeline, be transported to each water cooler 1 of chemical plant installations by cooling tower 2 bottoms by pipeline again, finish the circulation of chemical plant installations recirculated water;
Second circulation is the circulation of the heating agent of heat pump: the heating agent of vaporization is transported to compressor 6 in the evaporimeter 5, promoting potential temperature through compressor 6 heats, be transported to the condenser 7 of heat pump then, with carry the low temperature heating water heat exchange condensation of returning from heating equipment, the heating agent liquefy of vaporization, carry back evaporimeter 5 by pressure-reducing valve 8 again, finish the circulation of heating agent;
The 3rd circulation is the circulation of heating water: be transported to the low temperature heating water of condenser 7 from heating equipment by pipeline, after the heating agent that the is vaporized heating, flow to heating equipment by pipeline again, finish the circulation of heating water;
Adopt the advantage of such scheme to be, in the time can not normally using the heating circulation as the chemical plant installations circulating water cooling, can use cooling tower to lower the temperature.
The described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving method, also can adopt following method to realize that described method comprises three circulations:
First circulation is the circulation of chemical plant installations recirculated water: the recirculated water of the heat of chemical plant installations is transported to the evaporimeter 5 of heat pump from the output of water cooler 1 by pipeline, with the liquid heating agent of heat transferred, makes the heating agent vaporization; The recirculated water of heat through evaporimeter 5 with the liquid heating agent of heat transferred after, self temperature reduces, and is transported to each water cooler 1 of chemical plant installations from the evaporimeter 5 of heat pump by pipeline, finishes the circulation of chemical plant installations recirculated water;
Second circulation is the circulation of the heating agent of heat pump: the heating agent of vaporization is transported to compressor 6 in the evaporimeter 5, promoting potential temperature through compressor 6 heats, be transported to the condenser 7 of heat pump then, with carry the low temperature heating water heat exchange condensation of returning from heating equipment, the heating agent liquefy of vaporization, carry back evaporimeter 5 by pressure-reducing valve 8 again, finish the circulation of heating agent;
The 3rd circulation is the circulation of heating water: be transported to the low temperature heating water of condenser 7 from heating equipment by pipeline, after the heating agent that the is vaporized heating, flow to heating equipment by pipeline again, finish the circulation of heating water.
Further, the described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving method, wherein, the heating agent circulation of described chemical industry recirculated water circulation, heat pump, the circulation of heating water are to isolate mutually.
Further, the described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving system, wherein,
Each heat pump 3 of described heat pump includes evaporimeter 5, compressor 6, condenser 7;
Wherein, described water cooler 1 output is connected with evaporimeter 5 inputs of heat pump 3 in the heat pump by pipeline, and evaporimeter 5 outputs of heat pump 3 are connected with cooling tower 2 tops by pipeline, and cooling tower 2 bottoms are connected with water cooler 1 by pipeline;
The output of the condenser 7 of heat pump 3 is connected with the input of heating system by pipeline in the described heat pump; The output of described heating system is connected with the input of condenser 7.
In addition, present embodiment also can adopt chemical plant installations circulating water cooling as described below and low grade heat energy utilization and water-saving system, wherein,
Described device comprises water cooler 1, heat pump, heating system 4;
Each heat pump 3 of described heat pump includes evaporimeter 5, compressor 6, condenser 7;
Wherein, described water cooler 1 output is connected with evaporimeter 5 inputs of heat pump 3 in the heat pump by pipeline, and evaporimeter 5 outputs of heat pump 3 are connected with water cooler 1 by pipeline;
The output of the condenser 7 of heat pump 3 is connected with the input of heating system by pipeline in the described heat pump; The output of described heating system is connected with the input of condenser 7.
The described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving system, wherein, described heat pump comprises at least one heat pump 3.
In addition, the described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving system, wherein, when described heat pump comprised the above heat pump 3 of Liang Tai and two, the formation heat pump was connected in parallel between each heat pump 3;
Described heat pump and water cooler 1, heating system 4 are connected in series.
The described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving system, also can adopt following structure, when described heat pump comprised the above heat pump 3 of Liang Tai and two, each heat pump 3 was earlier with after different heating systems 4 are connected in series, parallel connection again.
Further, the described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving system, wherein,
Described evaporimeter 5 is connected with condenser 7 with second channel 10 by first passage 9;
Described first passage 9 is for delivery of the heating agent of vaporization; Described second channel 10 is for delivery of the heating agent of liquid state;
Described first passage 9 refers to that evaporimeter 5 upper ends are connected with compressor 6, the passage that compressor 6 is connected with condenser 7 upper ends;
Described second channel 10 refers to the passage that condenser 7 lower ends are connected with evaporimeter 5 lower ends; Described second channel 10 is provided with pressure-reducing valve 8.
When adopting the low grade heat energy heating of chemical plant installations recirculated water, with circulating water device with after heating equipment is connected, though increased the electric energy that the heat pump device consumes, but but saved the standard coal amount of using, and also having reduced chemical plant installations is water and the electric energy that circulating water cooling is wasted, table 2 is compared power consumption, the contrast table of conserve water, electricity, coal for the low grade heat energy heating of adopting chemical plant installations recirculated water with adopting the heat-only boilers heating.
The described chemical plant installations circulating water cooling of present embodiment and low grade heat energy utilization and water-saving system and method, only be to have increased the electric energy that heat pump consumes, the COP value of general heat pump heat supply can reach more than 4, the electric energy that namely consumes 1kw can obtain the heat energy of 4kw, is equivalent to take out of from low-temperature heat source the heat energy of 3kw.If recirculated water can provide heat 1*10
8During kcal/, be equivalent to 1.16*10
5Kw, the electric energy that needs heat pump for its 1/3, i.e. 3.87*10
4Kw, both add the space heating load that the system of being can provide, and add up to 1.547*10
5Kw calculates with every square metre of thermic load 50W of user, and 3,090,000 square metres heating can be provided.
According to the standard of embodiment 1, adopt the heat-only boilers heating, be 3,090,000 square meters required total Coal-fired capacity 5 months 24 hours every days of heating be 309*10000 square metre of * 8.79 grams/square metre the time 150 days * of * 24 hours=97780*10
6Restrain=97780 tons.
Table 2
| Adopt the low grade heat energy heating of chemical plant installations recirculated water | The increase and decrease amount | Unit price | Increase heating phase economic benefit unit: ten thousand yuan |
| Chemical plant installations is the circulating water cooling water consumption | Save 150 tons/ |
2 yuan/ton | 108 |
| Chemical plant installations is the circulating water cooling power consumption | Saved for 500 degree/times | 0.5 unit/degree | 90 |
| The heat pump power consumption | Increase 3.87*10 4kw | 0.5 unit/degree | 6966 |
| Save standard coal | Save 97780 tons | 800 yuan/ton | 7822 |
| Amount to and save | ? | ? | 1054 |
From above analysis as can be known, the low grade heat energy that promotes chemical plant installations recirculated water by heat pump is used for heating, to take out the heat of recirculated water, make it to circulate again, be fully feasible technically, though increased the heat pump consumed power, concerning chemical plant installations factory, the electricity that consumes for circulating water cooling, water have been saved, concerning heating company, saved fire coal, on the whole, still save a very big expense, and reduced the discharging of pollutants such as sulphur, nitrogen oxide.
Claims (9)
1. chemical plant installations circulating water cooling and low grade heat energy utilization and water-saving method, it is characterized in that: described method comprises three circulations:
First circulation is the circulation of chemical plant installations recirculated water: the recirculated water of the heat of chemical plant installations is transported to the evaporimeter (5) of heat pump from the output of water cooler (1) by pipeline, with the liquid heating agent of heat transferred, makes the heating agent vaporization; The recirculated water of heat through evaporimeter (5) with the liquid heating agent of heat transferred after, self temperature reduces, be transported to cooling tower (2) top from the evaporimeter (5) of heat pump by pipeline, be transported to each water cooler (1) of chemical plant installations by cooling tower (2) bottom by pipeline again, finish the circulation of chemical plant installations recirculated water;
Second circulation is the circulation of the heating agent of heat pump: the heating agent of vaporization is transported to compressor (6) in the evaporimeter (5), promoting potential temperature through compressor (6) heats, be transported to the condenser (7) of heat pump then, with carry the low temperature heating water heat exchange condensation of returning from heating equipment, the heating agent liquefy of vaporization, carry back evaporimeter (5) by pressure-reducing valve (8) again, finish the circulation of heating agent;
The 3rd circulation is the circulation of heating water: be transported to the low temperature heating water of condenser (7) from heating equipment by pipeline, after the heating agent that the is vaporized heating, flow to heating equipment by pipeline again, finish the circulation of heating water.
2. chemical plant installations circulating water cooling and low grade heat energy utilization and water-saving method, it is characterized in that: described method comprises three circulations:
First circulation is the circulation of chemical plant installations recirculated water: the recirculated water of the heat of chemical plant installations is transported to the evaporimeter (5) of heat pump from the output of water cooler (1) by pipeline, with the liquid heating agent of heat transferred, makes the heating agent vaporization; The recirculated water of heat through evaporimeter (5) with the liquid heating agent of heat transferred after, self temperature reduces, and is transported to each water cooler (1) of chemical plant installations from the evaporimeter (5) of heat pump by pipeline, finishes the circulation of chemical plant installations recirculated water;
Second circulation is the circulation of the heating agent of heat pump: the heating agent of vaporization is transported to compressor (6) in the evaporimeter (5), promoting potential temperature through compressor (6) heats, be transported to the condenser (7) of heat pump then, with carry the low temperature heating water heat exchange condensation of returning from heating equipment, the heating agent liquefy of vaporization, carry back evaporimeter (5) by pressure-reducing valve (8) again, finish the circulation of heating agent;
The 3rd circulation is the circulation of heating water: be transported to the low temperature heating water of condenser (7) from heating equipment by pipeline, after the heating agent that the is vaporized heating, flow to heating equipment by pipeline again, finish the circulation of heating water.
3. according to claim 1 or 2 described chemical plant installations circulating water cooling and low grade heat energy utilization and water-saving methods, it is characterized in that: the heating agent circulation of described chemical industry recirculated water circulation, heat pump, the circulation of heating water are to isolate mutually.
4. chemical plant installations circulating water cooling and low grade heat energy utilization and water-saving system is characterized in that:
Water cooler (1), cooling tower (2), heat pump, heating system (4) are drawn together by described system;
Each heat pump (3) of described heat pump includes evaporimeter (5), compressor (6), condenser (7);
Wherein, described water cooler (1) output is connected with evaporimeter (5) input of heat pump (3) in the heat pump by pipeline, evaporimeter (5) output of heat pump (3) is connected with cooling tower (2) top by pipeline, and cooling tower (2) bottom is connected with water cooler (1) by pipeline;
The output of the condenser (7) of heat pump in the described heat pump (3) is connected with the input of heating system by pipeline; The output of described heating system is connected with the input of condenser (7).
5. chemical plant installations circulating water cooling and low grade heat energy utilization and water-saving system is characterized in that:
Described device comprises water cooler (1), heat pump, heating system (4);
Each heat pump (3) of described heat pump includes evaporimeter (5), compressor (6), condenser (7);
Wherein, described water cooler (1) output is connected with evaporimeter (5) input of heat pump (3) in the heat pump by pipeline, and evaporimeter (5) output of heat pump (3) is connected with water cooler (1) by pipeline;
The output of the condenser (7) of heat pump in the described heat pump (3) is connected with the input of heating system by pipeline; The output of described heating system is connected with the input of condenser (7).
6. according to claim 4 or 5 chemical plant installations circulating water coolings and low grade heat energy utilization and water-saving system, it is characterized in that: described heat pump comprises at least one heat pump (3).
7. according to claim 4 or 5 described chemical plant installations circulating water cooling and low grade heat energy utilization and water-saving systems, it is characterized in that:
When described heat pump comprised Liang Tai and two above heat pumps (3), the formation heat pump was connected in parallel between each heat pump (3);
Described heat pump and water cooler (1), heating system (4) are connected in series.
8. according to claim 4 or 5 described chemical plant installations circulating water cooling and low grade heat energy utilization and water-saving systems, it is characterized in that:
When described heat pump comprises Liang Tai and two above heat pumps (3), after the first and different heating system (4) of each heat pump (3) is connected in series, in parallel again.
9. according to claim 4 or 5 chemical plant installations circulating water coolings and low grade heat energy utilization and water-saving system, it is characterized in that:
Described evaporimeter (5) is connected with condenser (7) with second channel (10) by first passage (9);
Described first passage (9) is for delivery of the heating agent of vaporization; Described second channel (10) is for delivery of the heating agent of liquid state;
Described first passage (9) refers to that evaporimeter (5) upper end is connected with compressor (6), the passage that compressor (6) is connected with condenser (7) upper end;
Described second channel (10) refers to the passage that condenser (7) lower end is connected with evaporimeter (5) lower end; Described second channel (10) is provided with pressure-reducing valve (8).
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Application publication date: 20130821 |