CN106988813B - A kind of system and method using waste heat driving process equipment - Google Patents

A kind of system and method using waste heat driving process equipment Download PDF

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Publication number
CN106988813B
CN106988813B CN201710340584.0A CN201710340584A CN106988813B CN 106988813 B CN106988813 B CN 106988813B CN 201710340584 A CN201710340584 A CN 201710340584A CN 106988813 B CN106988813 B CN 106988813B
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water
valve
heat
steam
cooling water
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CN106988813A (en
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周崇波
陈飞飞
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Huadian Electric Power Research Institute Co Ltd
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Huadian Electric Power Research Institute Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • F01K27/02Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat

Abstract

The present invention relates to a kind of system and method using waste heat driving process equipment.It is a kind of reasonable in design currently not yet, it is easy to use, it can be effectively using the system of urea technique waste heat driving gas compressor and the recovery waste heat of boiler replenishing water pump operating.System of the invention includes technical cooling tower, its main feature is that: it further include technical cooling water heat exchanger, two class heat pumps, steam stop, small turbine, interlock shut-off valve and oxygen-eliminating device, the cooling water outlet of technical cooling tower is connect by process cooling water discharge line with the high temperature side-entrance of technical cooling water heat exchanger, the high temperature side outlet of technical cooling water heat exchanger is connect by technical cooling water inflow pipe with the cooling water inlet of technical cooling tower, the condensator outlet of two class heat pumps is connect with heat pump cooling water discharge line, it is connect in the import of water compensating valve by heat pump cooling water discharge line.The present invention provides kinetic energy using waste heat, and safeguards system securely and reliably works, lifting system economic benefit.

Description

A kind of system and method using waste heat driving process equipment
Technical field
It is that one kind is capable of supply that the low product of utilization the present invention relates to a kind of system and method using waste heat driving process equipment Position thermal energy provides the system and method for kinetic energy, belongs to technical field of waste heat utilization.
Background technique
Second class absorption heat pump is otherwise known as warming heat pump, is that one kind is able to use medium temperature waste heat and low-temperature heat source to produce height The absorption heat pump of quality heat is able to ascend the quality of waste heat.Unit is by the absorption exothermic process in absorber, in heating Warm water can be become 150 DEG C or so of high-temperature-hot-water or steam.
The interior recirculated cooling water that a large amount of 100 DEG C or so can be generated in urea production process utilizes this part waste heat driven bromine Change the technological means of lithium refrigeration machine production chilled water in part factory application, but this partial heat is utilized to produce more Gao Pin The method in mass-energy source yet there are no introduction.
Small turbine is also known as low-pressure turbine, is that steam of the pressure lower than 1.5MPa is used to revolve as driven by energy blade The machine turned.Just there is the application using small turbine driving feed pump in coal-burning power plant, Ye You producer is dedicated for heat supply network circulation Water pump provides the small turbine of driving, and minimum steam inlet condition pressure can be down to 0.3MPa.Small steam turbine structure is simple, runs Reliably, converting mechanical energy by small turbine for low-pressure steam is a very beneficial utilization.
Gas compressor is a kind of impulsion mechanical device that low-pressure fluid is promoted to high-pressure fluid, in the mistake of compressed gas Cheng Zhong needs external offer power, can be motor drive, is also possible to steam turbine driving.In some processes of production urea Link needs to carry out compression operation to gas.
Boiler replenishing water pump be in therrmodynamic system convey condensed water mechanism, the prime mover connect can be it is electronic, can also To be steam-operating, driving equipment can be selected according to on-site actual situations.
Boiler replenishing water processing now mostly uses reverse osmosis treatment technology, in order to increase water rate, extend service life of equipment, It usually requires by the control of moisturizing inlet temperature between 25-35 DEG C, the too low then water rate decline of temperature, temperature is too high to be then easy damage Bad reverse osmosis membrane, presently, there are the wasting phenomenons heated using the high-quality energy to moisturizing.
Although there are also some waste heat comprehensive utilization systems, if publication date is on 06 12nd, 2013, Publication No. In the Chinese patent of CN103148705A, a kind of disclosed afterheat integral utilization system for sulfuric;For another example publication date is On November 23rd, 2016, in the Chinese patent of Publication No. CN106152094A, a kind of disclosed fatty acid production process waste heat Recycling system, these systems are not suitable in urea technique.
It is a kind of reasonable in design currently not yet, it is easy to use, can gas effectively be driven using urea technique waste heat The system of compressor and the recovery waste heat of boiler replenishing water pump operating.
Summary of the invention
It is an object of the invention to integrate the prior art, kinetic energy is provided using waste heat, safeguards system securely and reliably works, mentions Rise the system and method using waste heat driving process equipment of systematic economy benefit.The present invention first is rationally driven using waste heat production The mechanical energy of skill of starting building equipment operation, reduces the thermal pollution to environment, improves the economic benefit of system;Second is equipped with benefit Vapour system is filled, ensures that process equipment can be operated reliably;Third utilizes waste heat moisturizing, improves equipment water rate, Service life of equipment is extended, the low-grade exhaust heat being difficult to be utilized, further lifting system economic benefit have been recycled;4th system High degree of automation can be operated with distant place instruction according to the actual situation.Efficiency of energy utilization of the invention is high, economy effect Benefit is good, can recycle the production that waste heat serves urea well.
Technical solution used by the present invention solves the above problems is: this includes using the system that waste heat drives process equipment Technical cooling tower, design feature are: further including that process cooling water discharge line, technical cooling water heat exchanger, technique are cold But water inflow pipe, middle warm water water inlet line, two class heat pumps, middle warm water outlet conduit, steam stop, high-quality steam pipe Road, small turbine, low-quality jet chimney, interlocking shut-off valve, compressor, compressor driving device, water pump transmission device, boiler Small pump, oxygen-eliminating device, heat pump cooling water enter pipeline, heat pump cooling water discharge line, water compensating valve and water treatment device, described The cooling water outlet of technical cooling tower passes through the high temperature side-entrance of process cooling water discharge line and technical cooling water heat exchanger Connection, the high temperature side outlet of the technical cooling water heat exchanger are cold by technical cooling water inflow pipe and technical cooling tower But water inlet connects, and the low temperature side outlet of the technical cooling water heat exchanger passes through middle warm water water inlet line and two class heat pumps Driving heat source enters port connection, and the driving heat source discharge port of the two classes heat pump is cold by middle warm water outlet conduit and technique But the absorber outlet of the low temperature side-entrance connection of water heat exchanger, the two classes heat pump is connect with the import of steam stop, The outlet of the steam stop is connected by the steam inlet of high-quality steam pipeline and small turbine, the small turbine Steam (vapor) outlet is connect by low-quality jet chimney with the import of interlocking shut-off valve, the outlet and two classes heat of the interlocking shut-off valve The absorber import of pump connects;The power outlet of the small turbine is connect by compressor driving device with compressor, described The power outlet of small turbine also passes through water pump transmission device and boiler replenishing water pump connects;The heat pump cooling water enter pipeline with The condenser inlet of two class heat pumps connects, and the condensator outlet of the two classes heat pump is connect with heat pump cooling water discharge line, institute It states and is connect in the import of water compensating valve by heat pump cooling water discharge line, the outlet of the water compensating valve and the import of water treatment device Connection, the outlet of the water treatment device and the moisturizing entrance of oxygen-eliminating device connect.
Preferably, the invention also includes condensate valve, reject steam pipeline, steam pressure regulation and truncation valve group, the side Road jet chimney is connect with steam pressure regulation and the import of truncation valve group, is connect by the steam pressure regulation and the outlet of truncation valve group in height On quality steam pipeline, the import of condensate valve is connect by the low-quality jet chimney, the outlet of the condensate valve is connected to In the condensate import of oxygen-eliminating device.
Preferably, the liquid level monitoring device is mounted on oxygen-eliminating device the invention also includes liquid level monitoring device.
Preferably, technical cooling water heat exchanger of the present invention is fluoroplastics heat exchanger.
Preferably, steam stop of the present invention, interlocking shut-off valve, steam pressure regulation and truncation valve group, condensate valve It is electrical interlocking control valve, when steam pressure regulation and truncation valve group open or close, remaining valve can execute opening and closing accordingly Operation.
Preferably, water compensating valve of the present invention is controlled by liquid level monitoring device, can be opened automatically according to deaerator level Valve closing door completes moisturizing operation.
Preferably, water treatment device of the present invention is the water treatment device using principle of reverse osmosis.
A method of process equipment is driven using waste heat, it is characterised in that: uses the system, the fortune of the method Steps are as follows for row:
(1) when technical cooling tower is started to work, process cooling water flows into technical cooling water heat exchanger and cools down, with Technical cooling tower is returned afterwards and completes cooling cycle, while two class of medium temperature water-driven in technical cooling water heat exchanger after heat absorption Heat pump producing steam, the middle stream of warm water after cooling enter technical cooling water heat exchanger and continue to absorb heat completion circulation, two classes heat Pump the steam produced and enter after small turbine work to return to two class heat pumps and continue heat absorption and complete steam working cycles, small turbine by Steam drive pumps output mechanical energy to compressor and boiler replenishing water, and compressor and boiler replenishing water pump are driven and start running and take It is engaged in urea production link, heat pump cooling water flows out again after flowing into two class heat pumps, completes the cooling to two class heat pumps, at this time steam Shut-off valve and interlocking shut-off valve are opened, and steam pressure regulation and truncation valve group, condensate valve and water compensating valve are in close state;
(2) when two class heat pumps break down, need maintenance or steam quality deficiency, steam pressure regulation and truncation valve group are beaten It opens, condensate valve interlocking at this time is opened, and steam stop and interlocking shut-off valve interlocking close, pass-out steam enter small turbine work Make, guarantees that urea production link is not influenced by afterheat utilizing system;Or by site operation personnel's steam off shut-off valve, then It interlocks shut-off valve interlocking close, steam pressure regulation and truncation valve group and condensate valve interlocking is opened;
(3) when oxygen-eliminating device needs moisturizing, water compensating valve can be opened manually, heat pump cooling water absorbs heat through two class heat pumps Part enters water treatment device progress water treatment afterwards, is re-fed into oxygen-eliminating device and completes moisturizing, moisturizing is turned off after the completion of moisturizing Valve;Or water compensating valve is opened when liquid level is lower than lower limit set value by the liquid level in liquid level monitoring device measurement oxygen-eliminating device, when When liquid level is higher than upper limit set value, water compensating valve is closed, the moisturizing work of oxygen-eliminating device is realized and is automatically controlled.
Preferably, present invention process cooling water from technical cooling tower be discharged, into technical cooling water heat exchanger after return It returns technical cooling tower and forms high-quality UTILIZATION OF VESIDUAL HEAT IN circulation canal;Middle warm water enters two classes heat after cooling water heat exchanger outflow Pump is then returned to cooling water heat exchanger and forms heat pump driving heat source circulation canal;Steam is flowed out from two class heat pumps, into small vapour Two class heat pumps are returned after turbine forms steam circulation channel;Kinetic energy is output to compressor from small turbine and boiler replenishing water is pumped and to be formed Mechanical energy output channel;Pass-out steam is introduced into steam pressure regulation and truncation valve group, subsequently enters small turbine, then by condensate valve Pass-out steam channel is formed into oxygen-eliminating device;Outflow forms heat pump cooling-water duct after heat pump cooling water enters two class heat pumps;Heat It pumps cooling water and it is logical to be entered back into water treatment device by water compensating valve for oxygen-eliminating device formation moisturizing after flowing out in two class heat pumps Road.
Compared with prior art, the present invention having the following advantages that and effect: (1) rationally being set using waste heat production driving technique The mechanical energy that received shipment turns, reduces the thermal pollution to environment, improves the economic benefit of system;(2) it is equipped with supplement steam system System ensures that process equipment can be operated reliably;(3) waste heat moisturizing is utilized, the water rate of equipment is improved, extends and set Standby service life, has recycled the low-grade exhaust heat being difficult to be utilized, further lifting system economic benefit;(4) system automation journey Degree is high, can be operated according to the actual situation with distant place instruction;(5) reasonable in design, design is unique, runs smoothly, can It is good by property;(6) efficiency of energy utilization is high, good in economic efficiency, can recycle the production that waste heat serves urea well.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the system in the embodiment of the present invention using waste heat driving process equipment.
In figure: 1, technical cooling tower;2, process cooling water discharge line;3, technical cooling water heat exchanger;4, technique is cold But water inflow pipe;5, middle warm water water inlet line;6, two class heat pump;7, middle warm water outlet conduit;8, steam stop;9, Gao Pin Matter jet chimney;10, small turbine;11, low-quality jet chimney;12, shut-off valve is interlocked;13, compressor driving device;14, Compressor;15, water pump transmission device;16, boiler replenishing water pumps;17, reject steam pipeline;18, steam pressure regulation and truncation valve group; 19, condensate valve;20, oxygen-eliminating device;21, heat pump cooling water enters pipeline;22, heat pump cooling water discharge line;23, water compensating valve; 24, water treatment device;25, liquid level monitoring device.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair Bright explanation and the invention is not limited to following embodiments.
Embodiment.
Referring to Fig. 1, in the present embodiment using waste heat driving process equipment system include technical cooling tower 1, technical cooling Water discharge pipe road 2, technical cooling water heat exchanger 3, technical cooling water inflow pipe 4, middle warm water water inlet line 5, two class heat pumps 6, middle warm water outlet conduit 7, steam stop 8, high-quality steam pipeline 9, small turbine 10, low-quality jet chimney 11, connection It locks shut-off valve 12, compressor driving device 13, compressor 14, water pump transmission device 15, boiler replenishing water and pumps 16, reject steam pipeline 17, steam pressure regulation and truncation valve group 18, condensate valve 19, oxygen-eliminating device 20, heat pump cooling water enter pipeline 21, heat pump cooling water drainage Pipeline 22, water compensating valve 23, water treatment device 24 and liquid level monitoring device 25 out.Wherein, technical cooling water heat exchanger 3 can be with For fluoroplastics heat exchanger, steam stop 8, interlocking shut-off valve 12, steam pressure regulation and truncation valve group 18, condensate valve 19 and benefit Water valve 23 all can be electrical interlocking control valve, water treatment device 24 can for utilize principle of reverse osmosis water treatment dress It sets.
The cooling water outlet of technical cooling tower 1 passes through process cooling water discharge line 2 and process cooling water in the present embodiment The high temperature side-entrance of heat exchanger 3 connects, and the high temperature side outlet of technical cooling water heat exchanger 3 is flowed by process cooling water manages Road 4 is connect with the cooling water inlet of technical cooling tower 1, the low temperature side outlet of technical cooling water heat exchanger 3 by middle warm water into Waterpipe 5 enters port with the driving heat source of two class heat pumps 6 and connect, and the driving heat source discharge port of two class heat pumps 6 passes through medium temperature Water outlet conduit 7 is connect with the low temperature side-entrance of technical cooling water heat exchanger 3, the absorber outlet of two class heat pumps 6 and steam The import of shut-off valve 8 connects, and the outlet of steam stop 8 passes through the steam inlet of high-quality steam pipeline 9 and small turbine 10 The steam (vapor) outlet of connection, small turbine 10 is connect by low-quality jet chimney 11 with the import of interlocking shut-off valve 12, and interlocking is cut Only the outlet of valve 12 is connect with the absorber import of two class heat pumps 6.
The power outlet of small turbine 10 is connect by compressor driving device 13 with compressor 14 in the present embodiment, small vapour The power outlet of turbine 10 also passes through water pump transmission device 15 and connect with boiler replenishing water pump 16.
Reject steam pipeline 17 and steam pressure regulation and the import of valve group 18 is truncated connect in the present embodiment, steam pressure regulation and section It is connect on high-quality steam pipeline 9 by the outlet of disconnected valve group 28, the import of condensate valve 19 is connect by low-quality jet chimney 11, coagulated The outlet for bearing water valve 19 is connected in the condensate import of oxygen-eliminating device 20.
Heat pump cooling water enters pipeline 21 and connect with the condenser inlet of two class heat pumps 6 in the present embodiment, two class heat pumps 6 Condensator outlet is connect with heat pump cooling water discharge line 22, and the import in water compensating valve 23 is connect by heat pump cooling water discharge line 22 On, the outlet of water compensating valve 23 is connect with the import of water treatment device 24, outlet and the oxygen-eliminating device 20 of water treatment device 24 The connection of moisturizing entrance, liquid level monitoring device 25 are mounted on oxygen-eliminating device 20.
The system using waste heat driving process equipment in the present embodiment includes with lower channel: process cooling water is cold from technique But tower 1 be discharged, into technical cooling water heat exchanger 3 after return technical cooling tower 1 formed high-quality UTILIZATION OF VESIDUAL HEAT IN circulation canal; Middle warm water enters two class heat pumps 6 after the outflow of cooling water heat exchanger 3, is then returned to cooling water heat exchanger 3 and forms heat pump drive Dynamic heat-source Cycles channel;Steam is flowed out from two class heat pumps 6, into small turbine 10 after return two class heat pumps 6 formed steam circulation Channel;Kinetic energy is output to compressor 14 from small turbine 10 and boiler replenishing water pump 16 forms mechanical energy output channel;Pass-out steam It is introduced into steam pressure regulation and truncation valve group 18, subsequently enters small turbine 10, then formed into oxygen-eliminating device 20 by condensate valve 19 Pass-out steam channel;Outflow forms heat pump cooling-water duct after heat pump cooling water enters two class heat pumps 6;Heat pump cooling water is from two classes It enters back into oxygen-eliminating device 20 into water treatment device 24 by water compensating valve 23 after being flowed out in heat pump 6 and forms moisturizing channel.
Operating procedure in the present embodiment using the system of waste heat driving process equipment is as follows.
(1) when technical cooling tower 1 is started to work, process cooling water flows into technical cooling water heat exchanger 3 and cools down, It is then returned to technical cooling tower 1 and completes cooling cycle, while the medium temperature water-driven in technical cooling water heat exchanger 3 after heat absorption Two class heat pumps, 6 producing steam, the middle stream of warm water after cooling enter technical cooling water heat exchanger 3 and continue to absorb heat completion circulation, The steam that two class heat pumps 6 are produced enter small turbine 10 work after return two class heat pumps 6 continue heat absorption complete steam working cycles, Small turbine 10 is pumped 16 output mechanical energies, compressor 14 and boiler replenishing water pump 16 to compressor 14 and boiler replenishing water by steam drive It is driven and starts running and serve urea production link, heat pump cooling water flows out again after flowing into two class heat pumps 6, completes to two The cooling of class heat pump 6, steam stop 8 and interlocking shut-off valve 12 are opened at this time, steam pressure regulation and truncation valve group 18, condensate valve 19 and water compensating valve 23 be in close state.
(2) when two class heat pumps 6 break down, need maintenance or steam quality deficiency, steam pressure regulation and truncation valve group 18 It opens, the interlocking of condensate valve 19 at this time is opened, and steam stop 8 and interlocking 12 interlocking close of shut-off valve, pass-out steam enter small Steam turbine 10 works, and guarantees that urea production link is not influenced by afterheat utilizing system;It can also be closed by site operation personnel Steam stop 8, then interlock 12 interlocking close of shut-off valve, steam pressure regulation and truncation valve group 18 and the interlocking of condensate valve 19 is opened.
(3) when oxygen-eliminating device 20 needs moisturizing, water compensating valve 23 can be opened manually, heat pump cooling water is absorbed through two class heat pumps Partially enter water treatment device 24 after heat and carry out water treatment, is re-fed into oxygen-eliminating device 20 and completes moisturizing, after the completion of moisturizing again Close water compensating valve 23;The liquid level in oxygen-eliminating device 20 can also be measured by liquid level monitoring device 25, when liquid level is lower than lower limit set value When, water compensating valve 23 is opened, when liquid level is higher than upper limit set value, closes water compensating valve 23, works the moisturizing of oxygen-eliminating device 20 and realizes It automatically controls.
In addition, it should be noted that, the specific embodiments described in this specification, the shape of parts and components are named Title etc. can be different, and above content is only to structure of the invention example explanation described in this specification.It is all according to According to equivalence changes or simple change that the invention patent design structure, feature and principle is done, it is included in this hair In the protection scope of bright patent.Those skilled in the art can do described specific embodiment various The mode that the modify or supplement or adopt of various kinds is similar substitutes, and without departing from structure of the invention or surmounts present claims Range defined in book, is within the scope of protection of the invention.

Claims (7)

1. a kind of system using waste heat driving process equipment, including technical cooling tower, it is characterised in that: further include technical cooling Water discharge pipe road, technical cooling water heat exchanger, technical cooling water inflow pipe, middle warm water water inlet line, two class heat pumps, medium temperature Water outlet conduit, steam stop, high-quality steam pipeline, small turbine, low-quality jet chimney, interlocking shut-off valve, compression It is cooling that machine, compressor driving device, water pump transmission device, boiler replenishing water pump, oxygen-eliminating device, heat pump cooling water enter pipeline, heat pump The cooling water outlet of water discharge pipe road, water compensating valve and water treatment device, the technical cooling tower is discharged by process cooling water Pipeline is connect with the high temperature side-entrance of technical cooling water heat exchanger, and the high temperature side outlet of the technical cooling water heat exchanger is logical It crosses technical cooling water inflow pipe to connect with the cooling water inlet of technical cooling tower, the low temperature of the technical cooling water heat exchanger Side outlet enters port with the driving heat source of two class heat pumps by middle warm water water inlet line and connect, the driving heat of the two classes heat pump Source discharge port is connect by middle warm water outlet conduit with the low temperature side-entrance of technical cooling water heat exchanger, the two classes heat pump Absorber outlet connect with the import of steam stop, the outlet of the steam stop pass through high-quality steam pipeline with it is small The steam inlet of steam turbine connects, the steam (vapor) outlet of the small turbine by low-quality jet chimney and interlock shut-off valve into The outlet of mouth connection, the interlocking shut-off valve is connect with the absorber import of two class heat pumps;The power outlet of the small turbine It is connect by compressor driving device with compressor, the power outlet of the small turbine also passes through water pump transmission device and boiler Small pump connection;The heat pump cooling water enters pipeline and connect with the condenser inlet of two class heat pumps, the two classes heat pump it is cold Condenser outlet is connect with heat pump cooling water discharge line, is connect in the import of water compensating valve by the heat pump cooling water discharge line, The outlet of the water compensating valve and the import of water treatment device connect, the outlet of the water treatment device and the moisturizing of oxygen-eliminating device Entrance connection.
2. the system according to claim 1 using waste heat driving process equipment, it is characterised in that: further include condensed water Valve, reject steam pipeline, steam pressure regulation and truncation valve group, the reject steam pipeline and steam pressure regulation and the import that valve group is truncated It is connect on high-quality steam pipeline by connection, the steam pressure regulation and the outlet of truncation valve group, by the low-quality jet chimney The import of condensate valve is connect, the outlet of the condensate valve is connected in the condensate import of oxygen-eliminating device.
3. the system according to claim 1 using waste heat driving process equipment, it is characterised in that: further include liquid level monitoring Device, the liquid level monitoring device are mounted on oxygen-eliminating device.
4. the system according to claim 1 using waste heat driving process equipment, it is characterised in that: the process cooling water Heat exchanger is fluoroplastics heat exchanger.
5. the system according to claim 2 using waste heat driving process equipment, it is characterised in that: the steam cut-off Valve, interlocking shut-off valve, steam pressure regulation and truncation valve group, condensate valve are electrical interlocking control valve.
6. a kind of method using waste heat driving process equipment, it is characterised in that: wanted using any right of such as Claims 1 to 5 The system is sought, the operating procedure of the method is as follows:
(1) when technical cooling tower is started to work, process cooling water flows into technical cooling water heat exchanger and cools down, and then returns It returns technical cooling tower and completes cooling cycle, while the two class heat pump of medium temperature water-driven in technical cooling water heat exchanger after heat absorption Producing steam, the middle stream of warm water after cooling enter technical cooling water heat exchanger and continue to absorb heat completion circulation, two class heat pump systems The steam taken enter small turbine work after return two class heat pumps continue heat absorption complete steam working cycles, small turbine is by steam Driving pumps output mechanical energy to compressor and boiler replenishing water, and compressor and boiler replenishing water pump are driven and start running and serve Urea production link, heat pump cooling water flow out again after flowing into two class heat pumps, complete the cooling to two class heat pumps, and steam ends at this time Valve and interlocking shut-off valve are opened, and steam pressure regulation and truncation valve group, condensate valve and water compensating valve are in close state;
(2) when two class heat pumps break down, need maintenance or steam quality deficiency, steam pressure regulation and truncation valve group are opened, this When condensate valve interlocking open, steam stop and interlocking shut-off valve interlocking close, pass-out steam enter small turbine work, protect Card urea production link is not influenced by afterheat utilizing system;Or it by site operation personnel's steam off shut-off valve, then interlocks Shut-off valve interlocking close, steam pressure regulation and truncation valve group and condensate valve interlocking are opened;
(3) when oxygen-eliminating device needs moisturizing, be opened manually water compensating valve, heat pump cooling water after two class heat pumps absorb heat part into Enter water treatment device and carry out water treatment, is re-fed into oxygen-eliminating device and completes moisturizing, water compensating valve is turned off after the completion of moisturizing;Or by Liquid level monitoring device measures the liquid level in oxygen-eliminating device, when liquid level is lower than lower limit set value, opens water compensating valve, when liquid level is higher than upper When limiting setting value, water compensating valve is closed, the moisturizing work of oxygen-eliminating device is realized and is automatically controlled.
7. the method according to claim 6 using waste heat driving process equipment, it is characterised in that: process cooling water is from work The discharge of skill cooling tower, into technical cooling water heat exchanger after return to technical cooling tower to form high-quality UTILIZATION OF VESIDUAL HEAT IN circulation logical Road;Middle warm water enters two class heat pumps after cooling water heat exchanger outflow, is then returned to cooling water heat exchanger and forms heat pump drive Dynamic heat-source Cycles channel;Steam is flowed out from two class heat pumps, into small turbine after return two class heat pumps formed steam circulation channel; Kinetic energy is output to compressor from small turbine and boiler replenishing water pumps and to form mechanical energy output channel;Pass-out steam is introduced into steam tune Pressure and truncation valve group, subsequently enter small turbine, then enter oxygen-eliminating device by condensate valve and form pass-out steam channel;Heat pump is cooling Outflow forms heat pump cooling-water duct after water enters two class heat pumps;Heat pump cooling water passes through moisturizing after flowing out in two class heat pumps Valve enters back into oxygen-eliminating device and forms moisturizing channel into water treatment device.
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