CN212435345U - Waste heat utilization generating set and protection device thereof - Google Patents
Waste heat utilization generating set and protection device thereof Download PDFInfo
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- CN212435345U CN212435345U CN202022137191.XU CN202022137191U CN212435345U CN 212435345 U CN212435345 U CN 212435345U CN 202022137191 U CN202022137191 U CN 202022137191U CN 212435345 U CN212435345 U CN 212435345U
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- energy consumption
- alarm branch
- waste heat
- consumption resistor
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Abstract
The embodiment of the utility model discloses waste heat utilization generating set and protection device thereof. The protection device of the generator set comprises a current transformer, wherein the current transformer comprises an alarm branch; the generator set is electrically connected with the energy dissipation resistor through the converter; when the output voltage of the generator set exceeds the threshold voltage, the converter controls the generator set and the energy consumption resistor to be disconnected, and controls the alarm branch circuit to be powered on; the generator set is electrically connected with the energy consumption resistor through the brake loop; the brake circuit is connected with the alarm branch in parallel, and the brake circuit controls the connection between the generator set and the energy consumption resistor according to the electrification of the alarm branch; the power generation unit is connected with the energy consumption resistor in the process of closing the air inlet valve of the expansion machine and opening the exhaust valve of the expansion machine, the energy consumption resistor serves as a brake resistor to release the rotating speed of the power generation unit, and the power generation unit is effectively prevented from galloping in the process of closing the air inlet valve of the expansion machine and opening the exhaust valve.
Description
Technical Field
The embodiment of the utility model provides a relate to the power generation technical field, especially relate to a waste heat utilization generating set and protection device thereof.
Background
The waste heat utilization power generation refers to a technology of converting redundant heat energy in a production process into electric energy.
In the waste heat utilization generating set, the higher the rotating speed of the generating set is, the higher the output voltage of the generating set is. The output voltage of the generator set is monitored by the converter, when the output voltage of the generator set exceeds the rated voltage or the protection threshold value, the converter can disconnect the generator set from the load, and the waste heat utilization generator set controls the air inlet valve of the expansion machine to close and open the exhaust valve to reduce the rotating speed of the generator set, so that the generator set is prevented from flying.
However, at the moment when the converter disconnects the generator set from the load, the time length for closing the expander inlet valve and opening the expander exhaust valve is often longer than the time length from the rated speed to the overspeed of the generator set, and usually, the time length for closing the expander inlet valve and opening the expander exhaust valve is 4 seconds, while the time length from the rated speed to the overspeed of the generator set is 1-2 seconds, so when the output voltage of the generator set exceeds the rated voltage or the protection threshold value, the generator set is still unable to be prevented from galloping by only closing the expander inlet valve and opening the exhaust valve.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a waste heat utilization generating set and protection device thereof to when generating set's output voltage surpassed rated voltage or protective threshold value, effectively prevented that generating set from taking place the driving, thereby protected generating set.
In a first aspect, an embodiment of the present invention provides a waste heat utilization power generator set protection device, which includes:
a current transformer, the current transformer including an alarm branch; the generator set is electrically connected with the energy consumption resistor through the converter; the converter controls the generator set and the energy consumption resistor to be disconnected when the output voltage of the generator set exceeds a threshold voltage, and controls the alarm branch circuit to be powered on;
the generator set is electrically connected with the energy consumption resistor through the brake loop; the brake circuit is connected with the alarm branch in parallel, and the brake circuit controls the generator set to be connected with the energy consumption resistor according to the electrification of the alarm branch.
Optionally, the brake circuit comprises a relay and a first circuit breaker;
one end of a coil of the relay is electrically connected with the first end of the alarm branch circuit, and the other end of the coil of the relay is electrically connected with the second end of the alarm branch circuit;
one end of a normally open contact of the relay is electrically connected with the first end of the alarm branch circuit, and the other end of the normally open contact of the relay is electrically connected with the second end of the alarm branch circuit through a coil of the first circuit breaker;
one end of the contact of the first circuit breaker is electrically connected with the generator set, and the other end of the contact of the first circuit breaker is electrically connected with the energy consumption resistor.
Optionally, the alarm branch comprises a fault indicator light, a first end of the fault indicator light is used as a first end of the alarm branch, and a second end of the fault indicator light is used as a second end of the alarm branch.
Optionally, the converter further comprises a grid-side circuit breaker, a machine-side circuit breaker and a rectification and inversion module;
the generator set is connected with the energy consumption resistor sequentially through the machine side circuit breaker, the rectification inversion module and the network side circuit breaker;
and the converter controls the network side circuit breaker and the machine side circuit breaker to be disconnected when the output voltage of the generator set exceeds a threshold voltage so as to control the generator set and the energy consumption resistor to be disconnected.
Optionally, the generator set comprises a programmable logic controller and an expander;
the converter also outputs a fault signal while controlling the disconnection between the generator set and the energy consumption resistor;
and the programmable logic controller controls an air inlet valve of the expansion machine to be closed and controls an air outlet valve of the expansion machine to be opened according to the fault signal.
Optionally, the generator set further comprises a generator and an evaporator;
the generator is connected with the expansion machine and is a permanent magnet synchronous generator;
the evaporator is connected with the expander, and the evaporator inputs organic working media to the expander.
In a second aspect, the embodiment of the present invention further provides a waste heat utilizing generator set, which includes the following steps in any embodiment of the present invention.
The embodiment of the utility model provides a waste heat utilization generating set protection device includes the converter, and the converter includes the warning branch road, and the converter breaks off between control generating set and the power consumption resistance when generating set's output voltage surpasses threshold voltage, and the electric is gone up in the simultaneous control warning branch road. By arranging the brake circuit, the brake circuit controls the connection between the generator set and the energy consumption resistor according to the electrification of the alarm branch circuit; the method is characterized in that the alarm branch is controlled to be powered on by the converter at the moment when the converter enables the generator set to be disconnected from the energy consumption resistor, meanwhile, the brake circuit controls the generator set to be connected with the energy consumption resistor according to the power on of the alarm branch, so that the generator set is kept connected with the energy consumption resistor in the process of closing an air inlet valve of the expander and opening an exhaust valve of the expander, the energy consumption resistor serves as a brake resistor to release the rotating speed of the generator set, the generator set is effectively prevented from galloping in the process of closing the air inlet valve of the expander and opening the exhaust valve of the expander, the air inlet valve of the expander is closed and the exhaust valve of the expander is opened after the actions of closing the air inlet valve of the expander and opening the exhaust.
Drawings
Fig. 1 is a schematic structural diagram of a protection device for a waste heat utilization generator set provided by an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of the waste heat utilization generator set protection device shown in FIG. 1 when the output voltage of the generator set exceeds a threshold voltage;
fig. 3 is a schematic structural diagram of another protection device for a waste heat utilization generator set according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another protection device for a waste heat utilization generator set according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another protection device for a waste heat utilization generator set provided by an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is the embodiment of the utility model provides a waste heat utilization generating set protection device's schematic structure, refer to fig. 1, this waste heat utilization generating set protection device includes:
a current transformer 30, the current transformer 30 comprising an alarm branch 31; the generator set 10 is electrically connected with the energy consumption resistor 20 through the converter 30; when the output voltage of the generator set 10 exceeds the threshold voltage, the converter 30 controls the generator set 10 and the energy consumption resistor 20 to be disconnected, and controls the alarm branch 31 to be powered on;
the brake circuit 40 is used for electrically connecting the generator set 10 with the energy consumption resistor 20 through the brake circuit 40; the brake circuit 40 is connected with the alarm branch 31 in parallel, and the brake circuit 40 controls the connection between the generator set 10 and the energy consumption resistor 20 according to the electrification of the alarm branch 31.
Specifically, in the generator set 10, the exhaust valve of the expander is closed and the intake valve of the expander is opened, so that the evaporator inputs high-temperature and high-pressure organic working medium to the expander and the expander uses the organic working medium to do work outwards, the expander drives the generator 13 to rotate accordingly, and the rotating speed of the generator 13 is approximate to the rotating speed of the generator set 10.
When the output voltage of the generator set 10 does not exceed the threshold voltage, as shown in fig. 1, the generator set 10 is electrically connected to the energy consumption resistor 20 through the converter 30, the generator set 10 outputs power to the energy consumption resistor 20 through the converter 30, the alarm branch 31 is not powered on, no current flows in the alarm branch 31, the brake circuit 40 is not turned on, the one of the generator set 10, the brake circuit 40, and the energy consumption resistor 20 is turned off, and the energy consumption resistor 20 is, for example, an electric load.
In the case that the output voltage of the genset 10 exceeds the threshold voltage, as shown in fig. 2, fig. 2 is a schematic structural diagram of the protection apparatus of the waste heat utilization genset 10 shown in fig. 1 when the output voltage of the genset 10 exceeds the threshold voltage, when the rotation speed of the genset 10 increases to cause the output voltage of the genset 10 to exceed the threshold voltage, the converter 30 fails, that is, the converter 30 controls the genset 10 to be electrically disconnected from the energy consumption resistor 20, and controls the alarm branch 31 to be powered on and controls the intake valve of the expander to close and the exhaust valve to open, then the brake loop 40 is conducted, that is, the branch of the genset 10, the brake loop 40 and the energy consumption resistor 20 is conducted, so that the genset 10 is electrically connected to the energy consumption resistor 20 during the operation of the genset 10 that the intake valve closes and the exhaust valve opens, therefore, the generator set 10 is effectively prevented from galloping in the process of closing the air inlet valve of the expansion machine and opening the exhaust valve of the expansion machine, and further after the actions of closing the air inlet valve of the expansion machine and opening the exhaust valve of the expansion machine are completed, the air inlet valve of the expansion machine is closed and the exhaust valve is opened, so that the rotating speed of the generator set 10 is safely reduced, and the safety of the generator set 10 is ensured. After the speed of the generator set 10 is safely reduced to a stop due to the closing of the expander inlet valve and the opening of the exhaust valve, the converter 30 can be manually reset, the converter 30 is reset, the alarm branch 31 is de-energized, the brake circuit 40 is not conducted, and the situation shown in fig. 1 can be resumed.
To sum up, the utility model discloses technical scheme, through setting up brake circuit 40, brake circuit 40 and converter 30's warning branch road 31 parallel connection is connected, when generating set 10 makes converter 30 trouble because of output voltage surpasss threshold voltage, brake circuit 40 switches on the electricity between generating set 10 and the power consumption resistance 20 according to warning branch road 31 and is connected, even make generating set 10 carry out the admission valve at the expander and close the in-process that discharge valve opened the action and keep electric with power consumption resistance 20 and be connected, power consumption resistance 20 acts as brake resistance and releases generating set 10's rotational speed, thereby prevented effectively that generating set 10 from taking place the driving in-process that the expander admission valve was closed and the expander discharge valve was opened in the expander.
Optionally, fig. 3 is a schematic structural diagram of another protection device for a waste heat utilization generator set provided in an embodiment of the present invention, and referring to fig. 3, a brake circuit 40 includes a relay 41 and a first circuit breaker 42; one end of the coil of the relay 41 is electrically connected with the first end of the alarm branch 31, and the other end of the coil of the relay 41 is electrically connected with the second end of the alarm branch 31; one end of a normally open contact K of the relay 41 is electrically connected with the first end of the alarm branch 31, and the other end of the normally open contact K of the relay 41 is electrically connected with the second end of the alarm branch 31 through a coil of the first breaker 42; one end of the contact Q of the first circuit breaker 42 is electrically connected to the generator set 10, and the other end of the contact Q of the first circuit breaker 42 is electrically connected to the dissipation resistor 20.
Specifically, when the output voltage of the generator set 10 exceeds the threshold voltage, at the moment when the converter 30 disconnects the electrical connection between the generator set 10 and the energy consumption resistor 20, the alarm branch 31 is powered on, the coil of the relay 41 is powered on, the normally open contact K of the relay 41 is closed, the coil of the first circuit breaker 42 is powered on, the contact Q of the first circuit breaker 42 is closed, the brake circuit 40 is connected, the generator set 10, the brake circuit 40 and the energy consumption resistor 20 are connected, and the energy consumption resistor 20 serves as a brake resistor to release the rotating speed of the generator set 10, so that runaway of the generator set 10 in the process of closing the expander air inlet valve and opening the expander exhaust valve is effectively prevented.
Alternatively, referring to fig. 3, the alarm branch 31 includes a fault indicator lamp 310, a first end of the fault indicator lamp 310 serves as a first end of the alarm branch 31, and a second end of the fault indicator lamp 310 serves as a second end of the alarm branch 31.
Specifically, when the alarm branch 31 is powered on, current flows through the alarm branch 31, the fault indicator lamp 310 is powered on, and the fault indicator lamp 310 can give an alarm to the outside to indicate that the output voltage of the generator set 10 exceeds the threshold voltage or indicate that the converter 30 has a fault.
Optionally, fig. 4 is a schematic structural diagram of another protection device for a waste heat utilization generator set provided in an embodiment of the present invention, referring to fig. 4, the converter 30 further includes a grid-side circuit breaker 32, a machine-side circuit breaker 34, and a rectification and inversion module 33; the generator set 10 is connected with the energy consumption resistor 20 sequentially through the machine side circuit breaker 34, the rectification inverter module 33 and the network side circuit breaker 32; the converter 30 controls the grid-side breaker 32 and the machine-side breaker 34 to open when the output voltage of the generator set 10 exceeds a threshold voltage, so as to control the disconnection between the generator set 10 and the energy consumption resistor 20.
Specifically, the converter 30 in this embodiment can monitor the output voltage of the genset 10, and disconnect the electrical connection between the genset 10 and the energy consumption resistor 20 when the output voltage of the genset 10 exceeds the threshold voltage, and control the alarm branch 31 thereof to be powered on, and control the exhaust valve of the expander to open and close the intake valve, so that the converter 30 having the above functions can be applied to this embodiment. The converter 30 includes a grid-side circuit breaker 32, a machine-side circuit breaker 34 and a rectification and inversion module 33, and the converter 30 controls the grid-side circuit breaker 32 and the machine-side circuit breaker 34 to be disconnected when the output voltage of the generator set 10 exceeds the threshold voltage based on the rectification and inversion module 33, so as to control the generator set 10 and the energy consumption resistor 20 to be disconnected.
Optionally, fig. 5 is a schematic structural diagram of another protection device for a waste heat utilization generator set provided in an embodiment of the present invention, and referring to fig. 5, the generator set 10 includes a programmable logic controller 11 and an expansion machine 12; the converter 30 controls the disconnection between the generator set 10 and the energy consumption resistor 20 and simultaneously outputs a fault signal; the programmable logic controller 11 controls the closing of the intake valve of the expander 12 and the opening of the exhaust valve of the expander 12 in response to the fault signal.
Specifically, the programmable logic controller 11 is configured to control opening or closing of intake and exhaust valves of the expansion machine 12. When the output voltage of the generator set 10 exceeds the threshold voltage, the converter 30 outputs a fault signal to the programmable logic controller 11, the programmable logic controller 11 controls the air inlet valve of the expansion machine 12 to be closed and controls the exhaust valve of the expansion machine 12 to be opened according to the fault signal, so that the evaporator 14 stops inputting the organic working medium to the expansion machine 12, and the expansion machine 12 releases the organic working medium, thereby reducing the work of the expansion machine 12 to the outside and reducing the rotating speed of the generator set 10. Here, the programmable logic controller 11 controls the entire period of the full opening action (typically 4 seconds) of the fully closing exhaust valve of the intake valve of the expander 12 in accordance with the fault signal to be longer than the period (typically 1-2 seconds) of the generator set 10 from the rated speed to the overspeed.
Optionally, with continued reference to fig. 5, the generator set 10 further includes a generator 13 and an evaporator 14; the generator 13 is connected with the expansion machine 12, and the generator 13 is a permanent magnet synchronous generator; the evaporator 14 is connected with the expansion machine 12, and the evaporator 14 inputs organic working medium to the expansion machine 12.
Specifically, the evaporator 14 is configured to provide a high-temperature and high-pressure organic working medium to the expansion machine 12, and the expansion machine 12 applies work to the outside according to the organic working medium to drive the generator 13 to rotate, so that the generator 13 outputs voltage. Normally, the generator 13 outputs power to the energy consumption resistor 20 through the converter 30, when the output voltage of the generator 13 exceeds the rated voltage, the converter 30 disconnects the electrical connection between the generator 13 and the energy consumption resistor 20 and controls the alarm branch 31 to be powered on, and the programmable logic controller 11 controls the exhaust valve of the expander 12 to be opened and the intake valve of the expander 12 to be closed, the brake circuit 40 is conducted due to the powering on of the alarm branch 31, so that the brake circuit 40 enables the generator 13 and the energy consumption resistor 20 to be electrically connected in the process of the exhaust valve opening and the intake valve closing action of the expander 12, and the energy consumption resistor 20 serves as a brake resistor to release the rotating speed of the generator set 10, thereby effectively preventing the generator set 10 from flying in the process of closing the intake valve of the expander 12 and opening the exhaust valve of the. In addition, the generator 13 in this embodiment may be a permanent magnet synchronous generator, or may be another generator, which is not specifically limited in this embodiment.
The embodiment of the utility model provides a still provide a waste heat utilization generating set, this waste heat utilization generating set includes if the utility model discloses waste heat utilization generating set protection device in the arbitrary embodiment. The embodiment of the utility model provides a waste heat utilization generating set protection device and waste heat utilization generating set both belong to the same inventive concept, therefore can reach the same technological effect, and repeated content here is no longer repeated.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (7)
1. The utility model provides a waste heat utilization generating set protection device which characterized in that includes:
a current transformer, the current transformer including an alarm branch; the generator set is electrically connected with the energy consumption resistor through the converter; the converter controls the generator set and the energy consumption resistor to be disconnected when the output voltage of the generator set exceeds a threshold voltage, and controls the alarm branch circuit to be powered on;
the generator set is electrically connected with the energy consumption resistor through the brake loop; the brake circuit is connected with the alarm branch in parallel, and the brake circuit controls the generator set to be connected with the energy consumption resistor according to the electrification of the alarm branch.
2. The waste heat utilization generator set protection device of claim 1, wherein the brake circuit comprises a relay and a first circuit breaker;
one end of a coil of the relay is electrically connected with the first end of the alarm branch circuit, and the other end of the coil of the relay is electrically connected with the second end of the alarm branch circuit;
one end of a normally open contact of the relay is electrically connected with the first end of the alarm branch circuit, and the other end of the normally open contact of the relay is electrically connected with the second end of the alarm branch circuit through a coil of the first circuit breaker;
one end of the contact of the first circuit breaker is electrically connected with the generator set, and the other end of the contact of the first circuit breaker is electrically connected with the energy consumption resistor.
3. The waste heat utilization generator set protection device of claim 2,
the alarm branch comprises a fault indicator light, the first end of the fault indicator light is used as the first end of the alarm branch, and the second end of the fault indicator light is used as the second end of the alarm branch.
4. The waste heat utilization generator set protection device as claimed in claim 1, wherein the converter further comprises a grid-side circuit breaker, a machine-side circuit breaker and a rectification and inversion module;
the generator set is connected with the energy consumption resistor sequentially through the machine side circuit breaker, the rectification inversion module and the network side circuit breaker;
and the converter controls the network side circuit breaker and the machine side circuit breaker to be disconnected when the output voltage of the generator set exceeds a threshold voltage so as to control the generator set and the energy consumption resistor to be disconnected.
5. The waste heat utilizing genset protection device of claim 1, wherein the genset includes a programmable logic controller and an expander;
the converter also outputs a fault signal while controlling the disconnection between the generator set and the energy consumption resistor;
and the programmable logic controller controls an air inlet valve of the expansion machine to be closed and controls an air outlet valve of the expansion machine to be opened according to the fault signal.
6. The waste heat utilizing generator set protection device of claim 5, wherein the generator set further comprises a generator and an evaporator;
the generator is connected with the expansion machine and is a permanent magnet synchronous generator;
the evaporator is connected with the expander, and the evaporator inputs organic working media to the expander.
7. A waste heat utilizing electricity generating set, characterized by comprising a protection device of the waste heat utilizing electricity generating set according to any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022137191.XU CN212435345U (en) | 2020-09-25 | 2020-09-25 | Waste heat utilization generating set and protection device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022137191.XU CN212435345U (en) | 2020-09-25 | 2020-09-25 | Waste heat utilization generating set and protection device thereof |
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| CN212435345U true CN212435345U (en) | 2021-01-29 |
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| CN202022137191.XU Active CN212435345U (en) | 2020-09-25 | 2020-09-25 | Waste heat utilization generating set and protection device thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115468301A (en) * | 2022-10-26 | 2022-12-13 | 中国核动力研究设计院 | Generating set energy consumption device |
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2020
- 2020-09-25 CN CN202022137191.XU patent/CN212435345U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115468301A (en) * | 2022-10-26 | 2022-12-13 | 中国核动力研究设计院 | Generating set energy consumption device |
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