CN220931766U - Waste heat utilization device, carbon dioxide energy storage system and cement production system - Google Patents

Abstract

The disclosure discloses a waste heat utilization device, a carbon dioxide energy storage system and a cement production system, and belongs to the technical field of energy storage. The waste heat utilization device comprises a first heat exchange flow path, wherein one end of the first heat exchange flow path is connected with a waste heat source unit, the waste heat source unit is at least one of a cement kiln and a waste heat boiler, and waste heat resources contained in the waste heat source unit are at least one of waste gas of the cement kiln and waste gas of the waste heat boiler; the carbon dioxide energy storage system comprises an air storage, an energy storage component, a liquid storage tank and an energy release component which are sequentially connected in a closed loop; the other end of the first heat exchange flow path is connected with the energy release assembly and is used for transmitting the heat of the waste heat resource contained in the waste heat source unit to the energy release assembly through the first heat exchange flow path to heat the carbon dioxide flowing through the energy release assembly. The utility model discloses a can solve the insufficient technical problem of waste heat recovery.

Description

Waste heat utilization device, carbon dioxide energy storage system and cement production system

Technical Field

The disclosure belongs to the technical field of energy storage, and in particular relates to a waste heat utilization device, a carbon dioxide energy storage system and a cement production system.

Background

In industrial processes, a large amount of waste heat is usually generated. Whether the waste heat can be fully utilized is the key of energy conservation and emission reduction.

In the related art, a cement production system is a high-energy-consumption production system, and in the production process, kiln head waste gas and kiln tail waste gas at about 350 ℃ are generated in a cement kiln, and account for about 30% of the total heat input of fuel. In order to recycle the waste heat of the part, a waste heat boiler is arranged in the cement production system, the heat energy of kiln head waste gas and kiln tail waste gas is converted into mechanical energy through the waste heat boiler, and then the mechanical energy is converted into electric energy, and the waste heat boiler waste gas which is not utilized and is at 80-120 ℃ is discharged to generate energy waste.

Disclosure of utility model

To solve at least one technical problem described above, an embodiment of the present disclosure provides a waste heat utilization device, a carbon dioxide energy storage system, and a cement production system. The technical scheme is as follows:

In a first aspect, an embodiment of the present disclosure provides a waste heat utilization device, which is applicable to a carbon dioxide energy storage system, where the waste heat utilization device includes a first heat exchange flow path, one end of the first heat exchange flow path is connected to a waste heat source unit, the waste heat source unit is at least one of a cement kiln and a waste heat boiler, and waste heat resources contained in the waste heat source unit are at least one of waste gas of the cement kiln and waste gas of the waste heat boiler; the carbon dioxide energy storage system comprises an air storage, an energy storage component, a liquid storage tank and an energy release component which are sequentially connected in a closed loop;

The other end of the first heat exchange flow path is connected with the energy release assembly and is used for transmitting the heat of the waste heat resource contained in the waste heat source unit to the energy release assembly through the first heat exchange flow path to heat the carbon dioxide flowing through the energy release assembly.

In one implementation of the present disclosure, the energy release assembly includes an evaporator and at least one expansion energy release portion;

When the expansion energy release parts are one or more, each expansion energy release part comprises an energy release heat exchanger and an expansion machine, and the energy release heat exchangers and the expansion machines are sequentially and alternately connected along the flow direction of the carbon dioxide;

The waste heat inlet and the waste heat outlet of the evaporator are connected in series in the first heat exchange flow path, the working medium inlet of the evaporator is connected with the liquid storage tank, the working medium outlet of the evaporator is connected with the energy release heat exchanger at the initial end, and the expander at the tail end is connected with the gas storage.

In another implementation of the present disclosure, the energy release assembly includes an evaporator and at least one expansion energy release portion;

When the expansion energy release parts are one or more, each expansion energy release part comprises an energy release heat exchanger and an expansion machine, and the energy release heat exchangers and the expansion machines are sequentially and alternately connected along the flow direction of the carbon dioxide;

The working medium inlet of the evaporator is connected with the liquid storage tank, the working medium outlet of the evaporator is connected with the energy release heat exchanger at the initial end, and the expander at the tail end is connected with the gas storage tank;

the first heat exchange flow path is connected with the waste heat source unit and the energy release heat exchanger.

In yet another implementation of the present disclosure, a second heat exchange flow path is further included;

the energy storage assembly comprises a preheater and at least one compressed energy storage part;

the second heat exchange flow path is connected with the waste heat source unit;

The waste heat inlet and the waste heat outlet of the preheater are connected in series in the second heat exchange flow path, the working medium inlet of the preheater is connected with the gas storage, and the working medium outlet of the preheater is connected with the at least one compression energy storage part.

In yet another implementation of the present disclosure, the first heat exchange flow path further includes a first heat inlet valve, and the second heat exchange flow path further includes a second heat inlet valve;

The first heat exchange flow path is connected with the waste heat source unit through the first heat inlet valve, and the second heat exchange flow path is connected with the waste heat source unit through the second heat inlet valve.

In yet another implementation of the present disclosure, the first heat exchange flow path further includes a heat rejection valve, and the second heat exchange flow path further includes a third heat intake valve;

The first heat exchange flow path is connected with the emptying port through the heat extraction valve, and the second heat exchange flow path is connected with the preheater through the third heat inlet valve.

In yet another implementation of the present disclosure, the waste heat utilization device further includes an indirect heat exchange flow path;

The indirect heat exchange flow path is respectively connected with the waste heat source unit and the first heat exchange flow path, a heat exchange medium flows in the indirect heat exchange flow path, waste heat resources contained in the waste heat source unit transfer heat to the heat exchange medium through the indirect heat exchange flow path, and the heat exchange medium transfers heat to the energy release assembly through the first heat exchange flow path after heat transfer.

In yet another implementation of the present disclosure, the indirect heat exchange flow path includes a media source, a third heat exchanger, and a return line;

The waste heat inlet of the third heat exchanger is connected with the waste heat source unit, the waste heat outlet of the third heat exchanger is connected with the emptying port, the medium inlet of the third heat exchanger is connected with the medium source, the medium outlet of the third heat exchanger is connected with the first heat exchange flow path, the return pipeline is connected between the first heat exchange flow path and the medium source, and the return pipeline is used for returning the heat exchange medium after heat exchange in the first heat exchange flow path to the medium source.

In a second aspect, embodiments of the present disclosure provide a carbon dioxide energy storage system, including the waste heat utilization device of the first aspect.

In a third aspect, embodiments of the present disclosure provide a cement production system including a waste heat source unit and a carbon dioxide energy storage system of the second aspect.

The technical scheme provided by the embodiment of the disclosure has the beneficial effects that:

the first heat exchange flow path can be connected with the waste heat source unit, and the first heat exchange flow path can transfer waste heat resource heat contained in the waste heat source unit to the energy release assembly through the first heat exchange flow path to heat carbon dioxide flowing through the energy release assembly, so that equipment investment for supplying heat to carbon dioxide working media of the energy release assembly is effectively reduced.

That is, the waste heat utilization device can use the waste heat resources in the waste heat source unit for heating the carbon dioxide working medium in the carbon dioxide energy storage system, so that the waste heat resources in the waste heat source unit are fully utilized, and the effects of energy conservation and emission reduction are effectively achieved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a block diagram of a waste heat utilization device provided by an embodiment of the present disclosure;

FIG. 2 is a block diagram of a waste heat utilization device provided by an embodiment of the present disclosure;

FIG. 3 is a block diagram of a waste heat utilization device provided by an embodiment of the present disclosure;

FIG. 4 is a block diagram of a waste heat utilization device provided by an embodiment of the present disclosure;

FIG. 5 is a block diagram of a waste heat utilization device provided by an embodiment of the present disclosure;

FIG. 6 is a block diagram of a waste heat utilization device provided by an embodiment of the present disclosure;

FIG. 7 is a block diagram of a waste heat utilization device provided by an embodiment of the present disclosure;

FIG. 8 is a block diagram of a waste heat utilization device provided by an embodiment of the present disclosure;

FIG. 9 is a block diagram of a waste heat utilization device provided by an embodiment of the present disclosure;

FIG. 10 is a block diagram of a waste heat utilization device provided by an embodiment of the present disclosure;

FIG. 11 is a frame diagram of a carbon dioxide energy storage system provided by an embodiment of the present disclosure;

FIG. 12 is a frame diagram of a cement production system provided by an embodiment of the present disclosure;

FIG. 13 is a production flow diagram of a cement kiln provided by an embodiment of the present disclosure;

Fig. 14 is a frame diagram of a waste heat recovery device provided by an embodiment of the present disclosure.

The symbols in the drawings are as follows:

1. A first heat exchange flow path;

11. a first heat inlet valve; 12. a heat rejection valve;

2. A second heat exchange flow path;

21. a second heat inlet valve; 22. a third heat inlet valve;

4. an indirect heat exchange flow path;

41. A media source; 42. a third heat exchanger; 43. a return line; 44. a first heat exchange medium valve; 45. a second heat exchange medium valve; 46. a fourth heat exchanger;

10. A gas storage;

20. A liquid storage tank;

30. an energy storage assembly;

310. A preheater; 320. a compression energy storage unit; 321. a compressor; 322. an energy storage heat exchanger; 330. a condenser;

40. An energy release assembly;

410. An evaporator; 420. an expansion energy release part; 421. an energy release heat exchanger; 422. an expander; 423. an energy release cooler;

100. A waste heat source unit;

1100. A cement kiln; 1200. a waste heat boiler;

300. A carbon dioxide energy storage system;

400. a waste heat recovery device; 4200. a waste heat expander; 4300. a dust remover.

Detailed Description

For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.

In this embodiment, referring to fig. 1, the waste heat utilization device includes a first heat exchange flow path 1, one end of the first heat exchange flow path 1 is connected to a waste heat source unit 100, the waste heat source unit 100 is at least one of a cement kiln and a waste heat boiler, waste heat resources contained in the waste heat source unit 100 are at least one of waste gas of the cement kiln and waste gas of the waste heat boiler, the carbon dioxide energy storage system includes a gas storage 10, an energy storage component 30, a liquid storage tank 20 and an energy release component 40 which are sequentially connected in a closed loop manner, and the other end of the first heat exchange flow path 1 is connected to the energy release component 40 for transferring waste heat resources contained in the waste heat source unit 100 to the energy release component 40 through the first heat exchange flow path 1 to heat carbon dioxide flowing through the energy release component 40.

The first heat exchange flow path 1 can be connected with the waste heat source unit 100, and the first heat exchange flow path 1 can transfer waste heat resource heat contained in the waste heat source unit 100 to the energy release assembly 40 through the first heat exchange flow path 1 to heat carbon dioxide flowing through the energy release assembly 40, so that equipment investment for supplying heat to the carbon dioxide working medium of the energy release assembly 40 is effectively reduced.

That is, the waste heat utilization device can use the waste heat resources in the waste heat source unit 100 to heat the carbon dioxide working medium in the carbon dioxide energy storage system, so as to fully utilize the waste heat resources in the waste heat source unit 100, and effectively achieve the effects of energy conservation and emission reduction.

After the heat exchange is completed, the waste heat resources can be returned to the waste gas emptying pipeline of the cement kiln and the cement production system of the waste heat boiler to be discharged, or discharged through a chimney, or directly discharged into the atmosphere. It will be appreciated that the waste heat boiler may not be limited to being from a cement production system, but may be from a steel plant or other production system with waste heat boilers. That is, the heat source of the waste heat boiler may not be limited to the cement kiln of the cement production system, but may be exhaust gas generated from a steel plant or other production systems.

Fig. 2 is a frame diagram of a waste heat utilization device, and in combination with fig. 2, the energy release assembly 40 includes an evaporator 410 and at least one expansion energy release portion 420.

When the expansion energy release portions 420 are one or more, each expansion energy release portion 420 comprises an energy release heat exchanger 421 and an expansion machine 422, the energy release heat exchangers 421 and the expansion machines 422 are sequentially and alternately connected along the flow direction of carbon dioxide, the waste heat inlet and the waste heat outlet of the evaporator 410 are connected in series in the first heat exchange flow path 1, the working medium inlet of the evaporator 410 is connected with the liquid storage tank 20, the working medium outlet of the evaporator 410 is connected with the energy release heat exchanger 421 at the initial end, and the expansion machine 422 at the tail end is connected with the gas storage 10.

It should be noted that, in this embodiment, only the number of the expansion energy releasing portions 420 is taken as one for example, but the number of the expansion energy releasing portions 420 is not limited, and the description is omitted.

In the above-described implementation, the evaporator 410 is used for evaporating carbon dioxide, the expander 422 is used for releasing energy, the expander 422 is connected to the energy releasing heat exchanger 421, the energy releasing heat exchanger 421 in the expansion energy releasing portion 420 at the beginning in the flow direction of carbon dioxide is connected to the evaporator 410, and the expander 422 in the expansion energy releasing portion 420 at the end is connected to the gas storage 10.

The beginning and end are defined herein as the direction from the reservoir 20 through the energy release assembly 40 to the reservoir 10.

The first heat exchange flow path 1 can transfer heat from the waste heat source contained in the waste heat source unit 100 to the evaporator 410, heat the carbon dioxide flowing through the evaporator 410, and the carbon dioxide output from the working fluid outlet of the evaporator 410 flows through the expansion energy release units 420 in sequence.

Fig. 3 is a frame diagram of a waste heat utilization device, and the pipeline shown in fig. 3 is different from the pipeline shown in fig. 2 mainly in that the first heat exchange flow path 1 does not exchange heat with carbon dioxide in the evaporator 410, but heats carbon dioxide in the energy release heat exchanger 421. Referring to fig. 3, in this embodiment, the energy release assembly 40 includes an evaporator 410 and at least one expansion energy release portion 420.

When the expansion energy release portions 420 are one or more, each expansion energy release portion 420 comprises an energy release heat exchanger 421 and an expansion machine 422, the energy release heat exchangers 421 and the expansion machines 422 are alternately connected in sequence along the flow direction of carbon dioxide, a working medium inlet of the evaporator 410 is connected with the liquid storage tank 20, a working medium outlet of the evaporator 410 is connected with the energy release heat exchanger 421 at the initial end, the expansion machine 422 at the tail end is connected with the gas storage 10, and the first heat exchange flow path 1 is connected with the waste heat source unit 100 and the energy release heat exchanger 421. Illustratively, the energy release heat exchanger 421 has a waste heat inlet and a waste heat outlet, and the waste heat inlet and the waste heat outlet of the energy release heat exchanger 421 are connected in series in the first heat exchange flow path 1.

In the above-described implementation, the evaporator 410 is used for evaporating carbon dioxide, the expander 422 is used for releasing energy, the expander 422 is connected to the energy releasing heat exchanger 421, the energy releasing heat exchanger 421 in the expansion energy releasing portion 420 at the beginning in the flow direction of carbon dioxide is connected to the evaporator 410, and the expander 422 in the expansion energy releasing portion 420 at the end is connected to the gas storage 10.

It should be noted that the beginning and the end are defined herein in terms of the direction from the reservoir 20 through the energy release assembly 40 to the air reservoir 10.

Through the first heat exchange flow path 1, the heat of the waste heat resource contained in the waste heat source unit 100 is transferred to the energy release heat exchanger 421, the carbon dioxide flowing through the energy release heat exchanger 421 is heated, and the carbon dioxide output from the working medium outlet of the evaporator flows into the expander 422 to perform work.

In this embodiment, the energy release assembly 40 further includes an energy release cooler 423, the expander 422 in the end expansion energy release part 420 is connected to the energy release cooler 423, the energy release cooler 423 is connected to the gas storage 10, and the energy release cooler 423 is used for cooling the carbon dioxide entering the gas storage 10.

Fig. 4 is a frame view of the waste heat utilization device, and in combination with fig. 4, the waste heat utilization device further includes a second heat exchange flow path 2. The energy storage assembly 30 includes a preheater 310 and at least one compressed energy storage 320, and the second heat exchange flow path 2 is connected to the waste heat source unit 100.

The waste heat inlet and the waste heat outlet of the preheater 310 are connected in series in the second heat exchange flow path 2, the working medium inlet of the preheater 310 is connected with the gas storage 10, and the working medium outlet of the preheater 310 is connected with at least one compression energy storage part 320.

In the above-described embodiment, the heat of the waste heat resource contained in the waste heat source unit 100 is transferred to the preheater 310 through the second heat exchange flow path 2, the carbon dioxide flowing through the preheater 310 is heated, and the carbon dioxide output from the working fluid outlet of the preheater 310 flows into the respective compression energy storage portions 320 in sequence.

In the present embodiment, the energy storage assembly 30 further includes a condenser 330, and the compressed energy storage part 320 includes a compressor 321 and an energy storage heat exchanger 322. The energy storage heat exchanger 322 in each compressed energy storage part 320 is connected with the compressor 321, the compressor 321 in the compressed energy storage part 320 at the beginning along the carbon dioxide circulation direction is connected with the gas storage 10, the energy storage heat exchanger 322 in the compressed energy storage part 320 at the end is connected with the condenser 330, and the condenser 330 is connected with the liquid storage tank 20.

It should be noted that the beginning and the end are defined herein in terms of the direction from the reservoir through the energy storage assembly 30 to the reservoir 20.

In the above implementation, the condenser 330 is used to condense carbon dioxide, and the compressor 321 is used to compress carbon dioxide.

Taking only one compressed energy storage part 320 as an example, the preheater 310, the compressor 321, the energy storage heat exchanger 322 and the condenser 330 are sequentially connected along the carbon dioxide circulation direction, and the carbon dioxide is heated by heat exchange with waste heat resources in the second heat exchange flow path in the preheater 310 so as to meet the temperature requirement of carbon dioxide entering the compressor 321, and the heated carbon dioxide enters the compressor 321 to be compressed, is subjected to heat exchange energy storage by the energy storage heat exchanger 322, is condensed by the condenser 330 and enters the liquid storage tank 20 to be stored.

The various waste heat resources of the waste heat source unit 100 may be used separately or in a unified manner.

For example, if they are separately used, since the kiln head exhaust gas and the kiln tail exhaust gas (collectively referred to as cement kiln exhaust gas) have relatively high temperatures (300 to 400 ℃), they are passed through the first heat exchanging flow path 1 to heat the evaporator 410 or the energy releasing heat exchanger 421. Since the residual air temperature of the exhaust-heat boiler is relatively low (80-120 c), it is passed through the second heat exchange flow path 2 to heat the preheater 310 (see fig. 5) or the evaporator 410.

If the waste gas is uniformly utilized, the waste gas of the kiln head, the waste gas of the kiln tail and the waste gas of the waste heat boiler are directly mixed and transmitted to the first heat exchange flow path 1 and the second heat exchange flow path 2.

Fig. 6 is a frame diagram of a waste heat utilization device, and in this embodiment, the first heat exchange flow path 1 further includes a first heat inlet valve 11, and the second heat exchange flow path 2 further includes a second heat inlet valve 21, in combination with fig. 6. The first heat exchanging path 1 is connected to the waste heat source unit 100 through a first heat inlet valve 11, and the second heat exchanging path 2 is connected to the waste heat source unit 100 through a second heat inlet valve 21.

In the above-described embodiment, the first heat-intake valve 11 and the second heat-intake valve 21 are engaged to control whether or not the first heat-exchange flow path 1 and the second heat-exchange flow path 2 communicate with the waste heat source unit 100.

When it is necessary to communicate the first heat exchange flow path 1 with the waste heat source unit 100, the first heat intake valve 11 is opened and the second heat intake valve 21 is closed. At this time, the waste heat resources in the waste heat source unit 100 are transferred to the first heat exchanging flow path 1 through the first heat inlet valve 11.

When it is necessary to communicate the second heat exchange flow path 2 with the waste heat source unit 100, the second heat intake valve 21 is opened and the first heat intake valve 11 is closed. At this time, the waste heat resources in the waste heat source unit 100 are transferred to the second heat exchanging flow path 2 through the second heat inlet valve 21.

Illustratively, the first and second intake valves 11, 21 are each shut-off valves.

Fig. 7 is a frame diagram of a waste heat utilization device, and in this embodiment, the first heat exchange flow path 1 further includes a heat extraction valve 12, the second heat exchange flow path 2 further includes a third heat intake valve 22, the first heat exchange flow path 1 is connected to an evacuation port through the heat extraction valve 12, and the second heat exchange flow path 2 is connected to a preheater 310 through the third heat intake valve 22.

In the above implementation manner, when the waste heat resource is in the first heat exchange flow path 1, the waste heat resource flows through the first heat inlet valve 11, the evaporator 410 (or the energy release heat exchanger 421) and the heat rejection valve 12 in sequence, and finally flows to the evacuation port to be exhausted. When the waste heat resource is in the second heat exchange flow path 2, the waste heat resource flows through the second heat inlet valve 21, the third heat inlet valve 22 and the preheater 310 in sequence, and finally flows to the emptying port for discharging.

Illustratively, the heat rejection valve 12 and the third heat intake valve 22 are both shut-off valves.

In some examples, the first heat intake valve 11, the second heat intake valve 21, the third heat intake valve 22, and the heat rejection valve 12 are electronic valves.

In the above implementation manner, electronic control of the first heat inlet valve 11, the second heat inlet valve 21, the third heat inlet valve 22 and the heat exhaust valve 12 is facilitated, so that linkage coordination of the first heat inlet valve 11, the second heat inlet valve 21, the third heat inlet valve 22 and the heat exhaust valve 12 is facilitated.

Of course, in other examples, the first heat intake valve 11, the second heat intake valve 21, the third heat intake valve 22, and the heat rejection valve 12 are manual valves. Therefore, even if faults such as power failure occur, manual operation can be performed, and the reliability of the waste heat utilization device is effectively improved.

The linkage between the first heat intake valve 11, the second heat intake valve 21, the third heat intake valve 22 and the heat exhaust valve 12 will be described below.

When the first heat exchange flow path 1 is required to work, the first heat inlet valve 11 and the heat exhaust valve 12 are opened, and the second heat inlet valve 21 and the third heat inlet valve 22 are closed. The waste heat resource flows through the first heat inlet valve 11, the evaporator 410 (or the energy release heat exchanger 421) and the heat rejection valve 12 in sequence, and finally flows to the emptying port for discharging. Thereby completing the complete heat exchange flow. In this process, the waste heat resource flows only through the evaporator 410 or the energy release heat exchanger 421, and does not flow through the preheater 310.

When the second heat exchange flow path 2 is required to work, the second heat inlet valve 21 and the third heat inlet valve 22 are opened, and the first heat inlet valve 11 and the heat exhaust valve 12 are closed. The waste heat resource flows through the second heat inlet valve 21, the third heat inlet valve 22 and the preheater 310 in sequence, and finally flows to the emptying port for discharging. Thereby completing the complete heat exchange flow. In this process, the waste heat resource flows only through the preheater 310, and not through the evaporator 410 or the energy-releasing heat exchanger 421.

As described above, in the present embodiment, the waste heat resource is the waste gas of the waste heat source unit 100, the waste gas, that is, the high temperature gas, as the heat exchange medium, which directly flows in the first heat exchange flow path 1 and the second heat exchange flow path 2 to realize heat exchange. This mode is direct heat exchange.

In other embodiments, the heat exchange medium can also be other fluids, such as water, heat transfer oil, pressurized water, and the like. The heat exchange medium is heated by the high-temperature waste gas and the residual gas of the waste heat source unit 100, and then flows in the first heat exchange flow path 1 and the second heat exchange flow path 2 to realize heat exchange. This mode is indirect heat exchange.

For example, when the waste heat source unit 100 outputs the waste gas (80-120 ℃), the heat exchange medium is water, and when the waste heat source unit 100 outputs the waste gas (300-400 ℃), the heat exchange medium is heat transfer oil, high pressure water, etc., which can be selected according to the requirement, without limitation.

Indirect heat exchange is described below.

Fig. 8 is a frame view of the waste heat utilization device, and in this embodiment, the waste heat utilization device further includes an indirect heat exchange flow path 4, in combination with fig. 8. The indirect heat exchange flow path 4 is respectively connected with the waste heat source unit 100 and the first heat exchange flow path 1, the heat exchange medium flows through the indirect heat exchange flow path 4, waste heat resources contained in the waste heat source unit 100 transfer heat to the heat exchange medium through the indirect heat exchange flow path 4, and the heat exchange medium after heat transfer transfers heat to the energy release assembly 40 through the first heat exchange flow path 1.

In the above implementation manner, the indirect heat exchange flow path 4 is provided with a heat exchange medium, and the heat exchange medium performs heat exchange with the waste heat resource in the waste heat source unit 100, so that the heat exchange medium stores heat, then flows to the first heat exchange flow path 1 and the second heat exchange flow path 2, performs heat exchange with the carbon dioxide working medium, and releases heat of the heat exchange medium, and absorbs heat of the carbon dioxide working medium to heat.

The heat of the waste heat source unit 100 is transferred to the first heat exchange flow path 1 and the second heat exchange flow path 2 by utilizing the heat exchange medium in the indirect heat exchange flow path 4, so that the waste heat resource of the waste heat source unit 100 only exchanges heat with the indirect heat exchange flow path 4, and does not need to exchange heat with the first heat exchange flow path 1 and the second heat exchange flow path 2, and compared with the direct heat exchange, the direct heat exchange device effectively reduces pipelines for transferring the waste heat resource, ensures that the waste heat source unit 100 and the waste heat utilization device are relatively independent, and reduces the risk of mutual influence.

Fig. 9 is a frame diagram of a waste heat utilization device, and in this embodiment, referring to fig. 9, the indirect heat exchange flow path 4 includes a medium source 41, a third heat exchanger 42, and a return line 43, where a waste heat inlet of the third heat exchanger 42 is connected to the waste heat source unit 100, a waste heat outlet of the third heat exchanger 42 is connected to an evacuation port, a medium inlet of the third heat exchanger 42 is connected to the medium source 41, a medium outlet of the third heat exchanger 42 is connected to the first heat exchange flow path 1, and the return line 43 is connected between the first heat exchange flow path 1 and the medium source 41, and the return line 43 is used for returning the heat exchange medium after heat exchange in the first heat exchange flow path 1 to the medium source 41.

In the above implementation manner, the medium source 41 is configured to output a heat exchange medium, where the first outlet of the medium source 41 is connected to the medium inlet of the third heat exchanger 42, and the heat exchange medium stores heat after heat exchange in the third heat exchanger 42 and the waste heat resource in the waste heat source unit 100, and is converted into a high-temperature heat exchange medium. The high-temperature heat exchange medium flows to the first heat exchange flow path 1 and the second heat exchange flow path 2 again and exchanges heat with the carbon dioxide working medium, so that the heat exchange medium releases heat, and the carbon dioxide working medium absorbs heat and heats. The heat exchange medium having completed heat exchange in the first heat exchange flow path 1 and the second heat exchange flow path 2 is returned to the medium source 41 through the return line 43 for recycling.

The waste gas and the waste gas after the heat exchange in the third heat exchanger 42 are returned to the waste gas evacuation line of the cement production system to which the waste heat source unit 100 belongs and are discharged, or are discharged through a chimney, or are directly discharged to the atmosphere.

In the indirect heat exchange, the switching between the first heat exchange flow path 1 and the second heat exchange flow path 2 is also controlled by the first heat inlet valve 11, the second heat inlet valve 21, the third heat inlet valve 22 and the heat exhaust valve 12, which are not described herein.

With continued reference to fig. 9, in this embodiment, the indirect heat exchange flow path 4 further includes a first heat exchange medium valve 44, the first heat exchange medium valve 44 being in series between the medium source 41 and the third heat exchanger 42.

In the above-described implementation, the first heat exchange medium valve 44 is used to control the communication or shut-off between the medium source 41 and the third heat exchanger 42.

In this embodiment, the indirect heat exchange flow path 4 further comprises a second heat exchange medium valve 45, the second heat exchange medium valve 45 being connected in series at the return port of the medium source 41.

In the above implementation, the second heat exchange medium valve 45 is used to control whether the heat exchange medium in the first heat exchange flow path 1 and the second heat exchange flow path 2 flows back into the medium source 41.

It will be readily appreciated that the second heat exchange medium valve 45 is used to control the communication or shut-off between the medium source 41 and the first heat exchange flow path 1 when the first heat exchange flow path 1 is in operation. The second heat exchange medium valve 45 is used to control the communication or shut-off between the medium source 41 and the second heat exchange flow path 2 when the second heat exchange flow path 2 is in operation.

In the present embodiment, the first heat exchange medium valve 44 and the second heat exchange medium valve 45 are electronic valves.

In the above implementation manner, electronic control of the first heat exchange medium valve 44 and the second heat exchange medium valve 45 is facilitated, so that linkage cooperation of the first heat exchange medium valve 44 and the second heat exchange medium valve 45 is facilitated.

Of course, in other examples, the first heat exchange medium valve 44 and the second heat exchange medium valve 45 are manual valves. Therefore, even if faults such as power failure occur, manual operation can be performed, and the reliability of the carbon dioxide energy storage system is effectively improved.

Fig. 10 is a frame diagram of the waste heat utilization device, and in this embodiment, with reference to fig. 10, the waste gas and the waste gas in the waste heat source unit 100 are respectively output, the waste gas is output to the third heat exchanger 42, and the waste gas is output to the fourth heat exchanger 46. The fourth heat exchanger 46 is connected in series at the second outlet of the medium source 41, and the exhaust gas exchanges heat with the heat exchange medium output by the second outlet of the medium source 41 in the fourth heat exchanger 46, so that the heat storage temperature of the heat exchange medium rises.

In the above implementation manner, the temperature of the residual gas and the temperature of the exhaust gas are different and are not collected together, the temperature of the residual gas is relatively low, and the heat exchange medium output by the third heat exchanger 42 is mainly used for devices with low heating requirements, such as the preheater 310. The temperature of the exhaust gas is relatively high, and the heat exchange medium output by the fourth heat exchanger 46 is used for devices with high heating requirements, such as the energy release heat exchanger 421.

Embodiments of the present disclosure provide a carbon dioxide energy storage system, fig. 11 is a frame diagram of a carbon dioxide energy storage system including the waste heat utilization device shown in fig. 1-10.

Since the carbon dioxide energy storage system includes the waste heat utilization device shown in fig. 1 to 10, the carbon dioxide energy storage system has all the advantages of the waste heat utilization device shown in fig. 1 to 10, and will not be described in detail herein.

In this embodiment, the carbon dioxide energy storage system includes a gas storage 10, a liquid storage tank 20, an energy storage assembly 30, and an energy release assembly 40. The energy storage assembly 30 includes a preheater 310, a condenser 330, and at least one compressed energy storage portion 320, wherein the compressed energy storage portion 320 includes a compressor 321 and an energy storage heat exchanger 322. The energy release assembly 40 includes an evaporator 410, an energy release cooler 423, and at least one expansion energy release portion 420, the expansion energy release portion 420 including an expander 422 and an energy release heat exchanger 421.

When the carbon dioxide energy storage system works, the carbon dioxide energy storage system has two working states, namely an energy release state and an energy storage state.

In the energy release state, the liquid carbon dioxide in the liquid storage tank 20 flows to the gas storage 10, and at this time, the evaporator 410 and/or the energy release heat exchanger 421 are/is controlled to be communicated with the waste heat source unit 100, so as to heat the carbon dioxide working medium flowing through the evaporator and the energy release heat exchanger 421.

In the energy storage state, the gaseous carbon dioxide in the gas storage 10 flows to the liquid storage tank 20, and the preheater 310 is controlled to be communicated with the waste heat source unit 100 so as to heat the carbon dioxide working medium flowing through the preheater 310.

That is, the first heat exchange flow path 1 and the second heat exchange flow path 2 can serve as heating in both operating states.

In the state of releasing energy of the carbon dioxide energy storage system, the high-pressure liquid carbon dioxide working medium enters the evaporator 410 to perform heat exchange, so that the evaporation and heating of the liquid carbon dioxide are completed. The high-temperature and high-pressure gaseous carbon dioxide working medium enters the energy release heat exchanger 421 to be further heated, then enters the expander 422, the expander 422 is driven to do work to generate electricity, and the gaseous carbon dioxide working medium after the work is done finally returns to the gas storage 10 to be stored, and the next time the energy storage system operates.

In some examples, if the temperature of the carbon dioxide working medium after heat exchange does not meet the process conditions of the inlet of the expander 422 or the rated operation process requirement, the heat storage working medium in the system or the heat source available outside the system is used for heating the carbon dioxide.

In the energy storage state of the carbon dioxide energy storage system, the gaseous carbon dioxide working medium enters the preheater 310 for heat exchange, and the preheating of the gaseous carbon dioxide working medium is completed. The preheated gaseous carbon dioxide working medium enters a compressor 321, is compressed into a high-temperature and high-pressure gaseous carbon dioxide working medium in the compressor 321, and converts electric energy into pressure energy and heat energy through the compressor 321 in the process, and is stored in the carbon dioxide working medium. The high-temperature and high-pressure gas carbon dioxide working medium output by the compressor 321 enters the energy storage heat exchanger 322 to exchange heat with the heat storage working medium, the heat storage working medium absorbs the heat energy of the high-temperature and high-pressure gas carbon dioxide to store, and when the energy is released, the heat storage working medium supplies heat to the gas carbon dioxide flowing through the energy release heat exchanger 421 after absorbing the heat. The heat accumulating working medium can be heat conducting oil, pressurized water or molten salt. The carbon dioxide working medium output from the energy storage heat exchanger 322 enters the condenser 330 again to be condensed into liquid carbon dioxide, and finally the liquid carbon dioxide is stored in the liquid storage tank 20 for the next operation of the energy storage system.

An embodiment of the present disclosure provides a cement production system, fig. 12 is a frame diagram of the cement production system, and in combination with fig. 12, in this embodiment, the cement production system includes a waste heat source unit 100 and a carbon dioxide energy storage system 300 as described above, where the waste heat source unit 100 is at least one of a cement kiln 1100 and a waste heat boiler 1200. Therefore, the cement production system has all the advantages of the carbon dioxide energy storage system 300 described above, and will not be described herein.

It should be noted that, the energy storage state and the energy release state of the carbon dioxide energy storage system 300 may be intermittent, the cement kiln 1100 is continuously producing cement, the waste heat boiler 1200 is continuously operated accordingly, there is a mismatch between the operation time of the waste heat source unit 100 and the operation time of the carbon dioxide energy storage system 300, and the heat of the waste heat source unit 100 cannot be effectively utilized when the carbon dioxide energy storage system 300 is not operated. For this reason, the waste heat utilization device is configured with a buffer energy storage tank, the buffer energy storage tank is connected in series between the waste heat source unit 100 and the first heat exchange flow path 1 and the second heat exchange flow path 2, and the buffer energy storage tank stores heat of the waste heat source unit 100 when the carbon dioxide energy storage system 300 is not operated, and releases the stored heat when the carbon dioxide energy storage system 300 is operated, thereby further improving the waste heat resource utilization rate of the waste heat source unit 100.

Fig. 13 is a production flow chart of the cement kiln, and the exhaust gas generation of the waste heat source unit 100 will be briefly described with reference to fig. 13.

In the production process of the cement production system, the cement kiln 1100 works, and the preheater, the decomposing furnace and the grate cooler of the cement kiln 1100 can generate waste gas, mainly kiln head waste gas in the grate cooler, and kiln tail waste gas in the preheater and the decomposing furnace of the cement kiln 1100 are collectively called as waste gas of the cement kiln 1100.

In this embodiment, the cement production system includes a waste heat recovery device 400, the waste heat recovery device 400 being connected in series between the cement kiln 1100 and the carbon dioxide energy storage system 300.

In the above implementation, the exhaust gas generated by the cement kiln 1100 is transferred to the waste heat recovery device 400 for reuse, and if there is any remaining exhaust gas, the exhaust gas is transferred to the carbon dioxide energy storage system 300 for reuse. In the process of utilizing the waste gas, the waste gas exhausted by the waste heat recovery device 400 from the remaining heat boiler 1200 is also transferred to the carbon dioxide energy storage system 300 for reuse. That is, the waste heat resource generated by the waste heat source unit 100 of the carbon dioxide energy storage system 300 is waste gas generated by the cement kiln 1100 and waste gas discharged by the waste heat boiler 1200. Accordingly, the waste gas generated from the cement kiln 1100 can be fully utilized by the waste heat recovery device 400 and the carbon dioxide storage system 300.

Fig. 14 is a frame diagram of a waste heat recovery device, and referring to fig. 14, the waste heat recovery device 400 includes a waste heat boiler 1200 and a waste heat expander 4200, and waste gas generated by the cement kiln 1100 is transmitted to the waste heat boiler 1200, so as to generate superheated steam, so as to drive the waste heat expander 4200 to work, and further convert mechanical energy into electrical energy for use. The waste gas generated by the residual cement kiln 1100 and the residual gas discharged by the waste heat boiler 1200 continue to enter the carbon dioxide energy storage system 300 and are recycled again.

Illustratively, the waste heat recovery apparatus 400 further includes a dust remover 4300, the dust remover 4300 being connected in series between the cement kiln 1100 and the waste heat boiler 1200, thereby removing dust from the waste gas output from the cement kiln 1100.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," "third," and the like in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, is intended to mean that elements or items that are present in front of "comprising" or "comprising" are included in the word "comprising" or "comprising", and equivalents thereof, without excluding other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, and when the absolute position of the object to be described is changed, the relative positional relationships may be changed accordingly.

The foregoing description of the preferred embodiments of the present disclosure is provided for the purpose of illustration only, and is not intended to limit the disclosure to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and principles of the disclosure.

Claims (10)

1. The waste heat utilization device is characterized by being suitable for a carbon dioxide energy storage system and comprising a first heat exchange flow path (1), wherein one end of the first heat exchange flow path (1) is connected with a waste heat source unit (100), the waste heat source unit (100) is at least one of a cement kiln and a waste heat boiler, and waste heat resources contained in the waste heat source unit (100) are at least one of waste gas of the cement kiln and waste heat boiler; the carbon dioxide energy storage system comprises an air storage (10), an energy storage component (30), a liquid storage tank (20) and an energy release component (40) which are sequentially connected in a closed loop manner;

The other end of the first heat exchange flow path (1) is connected with the energy release assembly (40) and is used for transferring waste heat resource heat contained in the waste heat source unit (100) to the energy release assembly (40) through the first heat exchange flow path (1) to heat carbon dioxide flowing through the energy release assembly (40).

2. The waste heat utilization device of claim 1, wherein the energy release assembly (40) comprises an evaporator (410) and at least one expansion energy release portion (420);

When the expansion energy release parts (420) are one or more, each expansion energy release part (420) comprises an energy release heat exchanger (421) and an expander (422), and the energy release heat exchangers (421) and the expanders (422) are sequentially and alternately connected along the flow direction of carbon dioxide;

The waste heat inlet and the waste heat outlet of the evaporator (410) are connected in series in the first heat exchange flow path (1), the working medium inlet of the evaporator (410) is connected with the liquid storage tank (20), the working medium outlet of the evaporator (410) is connected with the energy release heat exchanger (421) at the initial end, and the expander (422) at the tail end is connected with the gas storage (10).

3. The waste heat utilization device of claim 1, wherein the energy release assembly (40) comprises an evaporator (410) and at least one expansion energy release portion (420);

When the expansion energy release parts (420) are one or more, each expansion energy release part (420) comprises an energy release heat exchanger (421) and an expander (422), and the energy release heat exchangers (421) and the expanders (422) are sequentially and alternately connected along the flow direction of carbon dioxide;

the working medium inlet of the evaporator (410) is connected with the liquid storage tank (20), the working medium outlet of the evaporator (410) is connected with the energy release heat exchanger (421) at the initial end, and the expander (422) at the tail end is connected with the gas storage tank (10);

The first heat exchange flow path (1) is connected with the waste heat source unit (100) and the energy release heat exchanger (421).

4. Waste heat utilization device according to claim 1, further comprising a second heat exchange flow path (2);

The energy storage assembly (30) comprises a preheater (310) and at least one compressed energy storage (320);

The second heat exchange flow path (2) is connected with the waste heat source unit (100);

The waste heat inlet and the waste heat outlet of the preheater (310) are connected in series in the second heat exchange flow path (2), the working medium inlet of the preheater (310) is connected with the gas storage (10), and the working medium outlet of the preheater (310) is connected with the at least one compression energy storage part (320).

5. The waste heat utilization device according to claim 4, wherein the first heat exchange flow path (1) further comprises a first heat inlet valve (11), and the second heat exchange flow path (2) further comprises a second heat inlet valve (21);

The first heat exchange flow path (1) is connected with the waste heat source unit (100) through the first heat inlet valve (11), and the second heat exchange flow path (2) is connected with the waste heat source unit (100) through the second heat inlet valve (21).

6. The waste heat utilization device according to claim 4, wherein the first heat exchange flow path (1) further comprises a heat rejection valve (12), and the second heat exchange flow path (2) further comprises a third heat intake valve (22);

The first heat exchange flow path (1) is connected with an emptying port through the heat extraction valve (12), and the second heat exchange flow path (2) is connected with the preheater (310) through the third heat inlet valve (22).

7. The waste heat utilization device according to any one of claims 1-6, further comprising an indirect heat exchange flow path (4);

The indirect heat exchange flow path (4) is respectively connected with the waste heat source unit (100) and the first heat exchange flow path (1), a heat exchange medium flows through the indirect heat exchange flow path (4), waste heat resources contained in the waste heat source unit (100) transfer heat to the heat exchange medium through the indirect heat exchange flow path (4), and the heat exchange medium after heat transfer transfers heat to the energy release assembly (40) through the first heat exchange flow path (1).

8. Waste heat utilization device according to claim 7, wherein the indirect heat exchange flow path (4) comprises a medium source (41), a third heat exchanger (42) and a return line (43);

The waste heat inlet of the third heat exchanger (42) is connected with the waste heat source unit (100), the waste heat outlet of the third heat exchanger (42) is connected with the emptying port, the medium inlet of the third heat exchanger (42) is connected with the medium source (41), the medium outlet of the third heat exchanger (42) is connected with the first heat exchange flow path (1), the return pipeline (43) is connected between the first heat exchange flow path (1) and the medium source (41), and the return pipeline (43) is used for returning the heat exchange medium after heat exchange in the first heat exchange flow path (1) to the medium source (41).

9. A carbon dioxide energy storage system comprising a waste heat utilization device according to any one of claims 1 to 8.

10. A cement production system characterized by comprising a waste heat source unit (100) and a carbon dioxide energy storage system according to claim 9.