CN218544496U - Boiler tail flue gas waste heat utilization device of gas and steam combined cycle back pressure unit - Google Patents
Boiler tail flue gas waste heat utilization device of gas and steam combined cycle back pressure unit Download PDFInfo
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- CN218544496U CN218544496U CN202223337867.5U CN202223337867U CN218544496U CN 218544496 U CN218544496 U CN 218544496U CN 202223337867 U CN202223337867 U CN 202223337867U CN 218544496 U CN218544496 U CN 218544496U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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Abstract
The utility model provides a flue gas waste heat utilization device at the tail part of a boiler of a gas-steam combined cycle back pressure unit, which is characterized in that a low-pressure steam pocket of the combined cycle back pressure unit is connected with a first water inlet of a hot water heater of the boiler through a low-pocket water replenishing pipeline, and a first water outlet of the hot water heater is connected with the low-pressure steam pocket; the first water inlet of the hot water heater is connected with the low-package water replenishing pipeline through a water replenishing conveying pipeline, and an electric door is arranged on the water replenishing conveying pipeline; the first water outlet of the hot water heater is connected with the low-pressure steam drum through a water supplementing loop pipeline, and a loop valve is arranged on the water supplementing loop pipeline. The utility model discloses an utilize low package moisturizing of boiler afterbody flue gas waste heat heating and hot user to feed water, realize the degree of depth utilization of afterbody flue gas waste heat to reduce boiler exhaust gas temperature, improve the boiler thermal efficiency.
Description
Technical Field
The utility model belongs to the technical field of the gas power generation, concretely relates to gas steam combined cycle backpressure unit boiler afterbody flue gas waste heat utilization equipment.
Background
A combined steam-gas cycle unit is a power plant that combines a steam turbine cycle and a gas turbine cycle. When the efficiency of the steam turbine cycle is improved by increasing the initial temperature, the initial temperature is difficult to be increased continuously due to the limitation of metal materials. Because the cycle end parameters of the steam turbine are lower, and the initial parameters of the gas turbine cycle are higher, the steam-gas combined cycle unit utilizes the advantages that the gas turbine cycle has higher initial temperature and the steam turbine cycle has lower end parameters to improve the heat efficiency of the whole cycle.
Compared with the traditional coal-electricity combined cycle generator set, the combined cycle generator set has the advantages of high starting and stopping speed, high flexibility, more environment-friendly fuel and the like, and the steam turbine has better heat efficiency compared with an extraction condensing steam turbine. Therefore, some gas-steam combined cycle back pressure generating sets are newly used for heat and power cogeneration of industrial steam in part of developed areas in China.
The Chinese patent with the application number of 202110417022.8 discloses a multi-backpressure gas-steam combined cycle power generation system, and the Chinese patent with the application number of 202110417022.8 discloses a multi-backpressure gas-steam combined cycle power generation system.
At present, after a gas-steam combined cycle backpressure unit is started, the exhaust gas temperature of a boiler is higher than the design exhaust gas temperature of the boiler, the exhaust gas temperature of the boiler is higher, the heat loss of exhaust gas is larger, the thermal efficiency of the boiler is reduced, larger gas loss and energy waste are caused, and a device for utilizing the waste heat of the exhaust gas at the tail part of the boiler needs to be developed to improve the thermal efficiency of the boiler.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a gas and steam combined cycle backpressure unit boiler afterbody flue gas waste heat utilization equipment has improved boiler thermal efficiency, energy saving.
The utility model adopts the technical proposal that: the utility model provides a flue gas waste heat utilization device at the tail part of a boiler of a gas and steam combined cycle back pressure unit, which is characterized in that a low-pressure steam pocket of the combined cycle back pressure unit is connected with a first water inlet of a hot water heater of the boiler through a low-pocket water replenishing pipeline, and a first water outlet of the hot water heater is connected with the low-pressure steam pocket;
the first water inlet of the hot water heater is connected with the low-package water replenishing pipeline through a water replenishing conveying pipeline, and an electric door is arranged on the water replenishing conveying pipeline; the first water outlet of the hot water heater is connected with the low-pressure steam drum through a water supplementing loop pipeline, and a loop valve is arranged on the water supplementing loop pipeline.
Furthermore, a bypass is arranged on the water supplementing conveying pipeline, and an adjusting door and a manual door are arranged on the bypass.
Furthermore, the number of the manual doors is two, and the two manual doors are respectively positioned on two sides of the adjusting door.
Further, both sides of the hot water heater are respectively provided with a water inlet temperature sensor and a water outlet temperature sensor, the water inlet temperature sensor is close to the first water inlet of the hot water heater and is arranged, the water outlet temperature sensor is close to the first water outlet of the hot water heater and is arranged, and the water inlet temperature sensor, the water outlet temperature sensor and the electric door are all connected with the controller.
Further, a flue gas temperature sensor is arranged at an air outlet of a chimney of the combined cycle back pressure unit and connected with the controller.
Further, the controller is a single chip microcomputer.
Furthermore, the hot water heater is also connected with a hot water inlet pipeline and a hot water outlet pipeline.
Furthermore, a water inlet valve is arranged on the hot water supply water inlet pipeline.
Furthermore, a water outlet valve is arranged on the hot water supply water outlet pipeline.
Furthermore, the hot water supply inlet pipeline and the hot water supply outlet pipeline are used for being connected with a hot water supply user.
The utility model has the advantages that:
the utility model discloses an utilize low package moisturizing of boiler afterbody flue gas waste heat heating and hot user to feed water, realize the degree of depth utilization of afterbody flue gas waste heat to reduce boiler exhaust gas temperature, improve the boiler thermal efficiency.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the attached drawing, a low-pressure steam drum 1, a hot water heater 2, an electric door 3, a manual door 4, an adjusting door 5, a water inlet valve 6, a water outlet valve 7, a water supplementing loop pipeline 8, a low-pressure steam drum water supplementing pipeline 9, a loop valve 10, a water inlet temperature sensor 11 and a water outlet temperature sensor 12 are arranged.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the objects of the present invention, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Example 1
The utility model provides a flue gas waste heat utilization device at the tail part of a boiler of a gas-steam combined cycle back pressure unit, which is characterized in that a low-pressure steam pocket 1 of the combined cycle back pressure unit is connected with a hot water heater 2 of the boiler through a low-pocket water replenishing pipeline 9, the hot water heater 2 heats low-pocket water replenishing conveyed by the low-pressure steam pocket 1, and the low-pocket water replenishing is returned and conveyed to the low-pressure steam pocket 1 after being heated; an electric door 3 is arranged between the low-package water replenishing pipeline 9 and the hot water heater 2, and the opening degree of the electric door 3 can be adjusted to control the low-package water replenishing flow entering the hot water heater 2.
Explaining the corresponding system of the utility model, referring to fig. 1, the low pressure steam pocket 1 of the combined cycle back pressure unit is connected with the hot water heater 2 of the boiler, specifically, the low pressure steam pocket 1 is connected with the first water inlet of the hot water heater 2 through the low water replenishing pipeline 9, and the first water outlet of the hot water heater 2 is connected with the low pressure steam pocket 1.
The first water inlet of hot water heater 2 is connected through moisturizing pipeline with low package between moisturizing pipeline 9, electrically operated gate 3 sets up on the moisturizing pipeline.
The water replenishing conveying pipeline is provided with a bypass, the bypass is provided with an adjusting door 5 and two manual doors 4, and the two manual doors 4 are respectively positioned on two sides of the adjusting door 5. When the boiler operates, the opening degree of the bypass regulating valve 5 of the hot water heater 2 is reasonably adjusted according to the pressure change of a boiler drum and the temperature change of boiler exhaust smoke, and fine adjustment is realized.
The utility model discloses in, transfer 5, manual door 4, bypass transfer 5 and electrically operated gate 3 all belong to water flow control valve, belong to the technical term that technical staff is familiar with in the field.
The first water outlet of the hot water heater 2 is connected with the low-pressure steam drum 1 through a water supplementing loop pipeline 8, and a loop valve 10 is arranged on the water supplementing loop pipeline 8. The hot water heater 2 discharges water and is connected to the low-pressure steam drum 1.
The utility model discloses connect partial low pressure steam pocket moisturizing to return low pressure steam pocket moisturizing again after hot water heater, add hot user's bypass hot water interface simultaneously at hot water heater outlet pipe. The boiler tail flue gas waste heat is used for heating low-package water replenishing and hot user water supplying, so that deep utilization of tail flue gas waste heat is achieved, the boiler smoke exhaust temperature is reduced, and the boiler thermal efficiency is improved.
Example 2
In this embodiment, on the basis of embodiment 1, the hot water heater 2 is further provided with a hot water inlet pipe and a hot water outlet pipe.
And a water inlet valve 6 is arranged on the hot water supply water inlet pipeline, and a water outlet valve 7 is arranged on the hot water supply water outlet pipeline. And the hot water supply inlet pipeline and the hot water supply outlet pipeline are used for being connected with a hot water supply user.
The inlet and outlet pipelines of the hot water heater are provided with reserved openings, hot water users can be linked in future, hot water can be sold externally, domestic hot water can be used by hotels and residents, the economic value of the system is improved by selling the hot water, and the price of the hot water is about 60 yuan.
The utility model discloses connect partial low pressure steam pocket moisturizing to return low pressure steam pocket moisturizing again after hot water heater, add hot user's bypass hot water interface simultaneously at hot water heater outlet pipe. The boiler tail flue gas waste heat is used for heating low-package water replenishing and hot user water supplying, so that deep utilization of tail flue gas waste heat is achieved, the boiler smoke exhaust temperature is reduced, and the boiler thermal efficiency is improved.
Example 3
This embodiment is on embodiment 1's basis, hot water heater 2's both sides are provided with water inlet temperature sensor 11 and delivery port temperature sensor 12 respectively, water inlet temperature sensor 11 closes on hot water heater 2's first water inlet setting, delivery port temperature sensor 12 closes on hot water heater 2's first delivery port setting, water inlet temperature sensor 11, delivery port temperature sensor 12 and electrically operated gate 3 all are connected with the controller.
The controller is a single chip microcomputer.
The opening degree of the electric door 3 can adjust the water replenishing flow of the low bag. According to the temperature difference between the water outlet temperature sensor 12 and the water inlet temperature sensor 11, the opening degree of the electric door 3 is increased as the temperature difference between the water outlet temperature sensor 12 and the water inlet temperature sensor 11 is larger. Through intelligent control, can the low packet of moisturizing of efficient heating, reduce the waste of heat, improve the utilization efficiency.
Example 4
In this embodiment, on the basis of embodiment 1, a flue gas temperature sensor is arranged at the outlet of a chimney of the combined cycle back pressure unit, and the flue gas temperature sensor is connected with the controller. The lower the exhaust gas temperature is, the larger the flow rate into the heater is, and the lower the exhaust gas temperature acquired by the exhaust gas temperature sensor is, the larger the opening degree of the electric door 3 is. Through intelligent control, can be according to the temperature of flue gas, the low moisturizing of package of efficient heating reduces the waste of heat, improves the utilization efficiency.
Example 5
This embodiment is on embodiment 3's basis, and combined cycle backpressure unit's chimney gas outlet department is provided with flue gas temperature sensor and flue gas flowmeter, flue gas temperature sensor and flue gas flowmeter all with the controller is connected.
In order to accurately control the invention, the opening degree of the electric door 3 can be more accurately controlled, the low-package water replenishing flow can be obtained through the formula (1),
flow rate F = heat supply Q/(enthalpy value h1 after heating — unheated enthalpy value h 2) (1);
in the formula (1), the flow F is obtained by the following method: obtaining initial smoke exhaust temperature T0, smoke exhaust amount m, specific volume c of smoke and designed smoke exhaust temperature T1 of the boiler, wherein the reduced heat loss is Q = cm (T0-T1); temperature measuring points are arranged on pipelines in front of and behind the hot water heater 2, the temperature of the hot water in front of and behind the hot water heater 2 can be measured, the enthalpy values of the hot water in front of and behind the hot water heater are respectively h2 (corresponding to the enthalpy value h2 after heating in the formula (1)) and h1 (corresponding to the enthalpy value h2 without heating in the formula (1)), and the flow F = Q [ (] eta/(h 1-h 2) = cm (T0-T1) [ (] eta/(h 1-h 2)); eta is the efficiency.
The opening degree of the electric door 3 is controlled according to a flow rate F, the flow rate F is related to the designed exhaust gas temperature, and the lower the exhaust gas temperature is, the larger the flow rate into the heater is. Through intelligent control, can make the temperature of flue gas can the low moisturizing of package of efficient heating, reduce the waste of heat, improve the utilization efficiency.
The utility model discloses during the use, calculate flow F earlier, this is low package moisturizing flow, adjusts 3 apertures of electrically operated gate and reaches flow F's numerical value until low package moisturizing flow, according to flow F's real-time numerical value, constantly adjusts 3 apertures of electrically operated gate. In order to improve the automation level of the whole device, in this embodiment, the electric door 3 is connected with the controller, temperature measuring points arranged in front of and behind the hot water heater 2 are temperature sensors, the two temperature sensors are connected with the controller, the flow rate F is obtained according to the value obtained by the automatic calculation of the controller, and then the opening degree of the electric door 3 is controlled to make the flow rate in the pipeline consistent with the value of the flow rate F. The controller is a single chip microcomputer.
Examples of the experiments
The Huanen Guilin distributed energy limited company is built with three sets of distributed combined cycle units, and the gas turbines of the three sets of units are all 6F.01 type gas turbines produced by GE company. Wherein the steam turbines of the No. 1 unit and the No. 2 unit are of a pumping condensing type, and the waste heat boiler is of a double-pressure type; the steam turbine of the No. 3 unit is in a back pressure type, and the waste heat boiler is in a single pressure type.
The last stage of heat exchange module of No. 3 backpressure unit boiler of Huanen Guilin energy company is a hot water heater, and the original design of the hot water heater is to heat external independent water supply by absorbing the waste heat of the flue gas at the tail of the boiler and provide hot water with the temperature of about 115 ℃ externally. Because there is no hot water supply requirement at present, the hot water heater is always in an idle standby state. The main design parameters of the waste heat boiler of the No. 3 unit are shown in the table 1. After the gas-steam combined cycle backpressure unit is started, the exhaust gas temperature of the boiler reaches 150 ℃, compared with the designed exhaust gas temperature of the boiler of 90 ℃, the exhaust gas temperature of the boiler is higher, the heat loss of the exhaust gas is larger, and the thermal efficiency of the boiler is reduced. Causing great gas loss and energy waste.
Table 1 number 3 unit waste heat boiler main design parameter
| Name(s) | Unit | Numerical value | Numerical value | Numerical value | Numerical value |
| Working conditions of combustion engine | ％ | 100 | 75 | 50 | 30 |
| Ambient temperature | ℃ | 19.2 | 19.2 | 19.2 | 19.2 |
| Atmospheric pressure | kPa | 99.58 | 99.58 | 99.58 | 99.58 |
| Inlet flue gas flow of waste heat boiler | t/h | 436.6 | 347.5 | 285.9 | 239.6 |
| Inlet flue gas temperature of waste heat boiler | ℃ | 598.3 | 626.7 | 648.9 | 648.9 |
| Composition of flue gas | |||||
| N 2 | mol％ | 73.88 | 73.84 | 73.96 | 74.19 |
| O 2 | mol％ | 12.31 | 12.21 | 12.55 | 13.22 |
| CO 2 | mol％ | 3.81 | 3.85 | 3.7 | 3.4 |
| H 2 O | mol％ | 9.12 | 9.21 | 8.9 | 8.31 |
| SO 2 | mol％ | 0 | 0 | 0 | 0 |
| Ar | mol％ | 0.88 | 0.88 | 0.88 | 0.88 |
| Exhaust-heat boiler thermal efficiency (external heating) | ％ | 85.97 | 86.53 | 87.37 | 87.61 |
| Exhaust-heat boiler thermal efficiency (external heat supply) | ％ | 81.11 | 83.74 | 84.59 | 84.77 |
| High-pressure part of waste heat boiler | / | / | / | / | / |
| Amount of steam | t/h | 67.10 | 57.9 | 49.79 | 41.56 |
| Superheater outlet steam pressure | bar | 58.2 | 51 | 44.6 | 37.5 |
| Superheater outlet steam temperature | ℃ | 537 | 537 | 537 | 537 |
| Purity of steam | ppm | 0.05 | 0.05 | 0.05 | 0.05 |
| Deaerator water replenishing temperature | ℃ | 20 | 20 | 20 | 20 |
| Independent heat exchanger water volume | t/h | 90.72 | 45.36 | 40.82 | 36.29 |
| Independent heat exchanger outlet pressure | bar | 11 | 11 | 11 | 11 |
| Independent heat exchanger outlet temperature | ℃ | 116.0 | 114.8 | 112.8 | 111.6 |
| Independent heat exchanger return water temperature | ℃ | 80 | 80 | 80 | 80 |
| External heat supply of independent heat exchanger | MW | 3.82 | 1.85 | 1.57 | 1.34 |
| Chimney smoke exhaust temperature (external heat supply) | ℃ | 128.6 | 117.6 | 115.8 | 114.6 |
| Chimney smoke exhaust temperature (external heating) | ℃ | 98.9 | 99.6 | 97.2 | 95.6 |
| Oxygen content at the outlet of the deaerator | μg/l | 7 | 7 | 7 | 7 |
| Temperature near the point of the economizer, high pressure | ℃ | 4.7 | 4.8 | 4.1 | 2.6 |
| Evaporator node temperature, high pressure | ℃ | 8 | 5.5 | 3.8 | 2.7 |
By adopting the device of the embodiment 1-3, the tail flue gas waste heat utilization system is improved for the No. 3 unit, and the deep utilization of the tail flue gas waste heat is realized by utilizing the tail flue gas waste heat of the boiler to heat the low-package water supplement and the hot user water supply, so that the exhaust gas temperature of the boiler is reduced, and the thermal efficiency of the boiler is improved.
By adopting the device of the embodiment 1 and putting the low-pressure steam drum water replenishing heating bypass, the test shows that the smoke discharge loss of the boiler can be reduced by more than 5 ℃, and by adopting the device of the embodiment 2, the heat efficiency of the external hot water supply boiler can be improved to 80% from 78% at present.
By means of the hot water heater, effective control of the steam temperature is achieved
The utility model discloses use hot water heater, boiler water balance, heat balance carry out the comprehensive research, do not cause the influence to unit safe normal operating.
At present, the technical scheme of the utility model is that a pilot plant test is carried out, namely a small-scale experiment of products before large-scale mass production; after the pilot test is finished, the investigation for the use of the user is carried out in a small range, and the investigation result shows that the satisfaction degree of the user is higher; the preparation of products for formal production for industrialization (including intellectual property risk early warning research) has been set forth.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed by the preferred embodiment, it is not limited to the present invention, and any person skilled in the art can make modifications or changes equivalent to the equivalent embodiments by utilizing the above disclosed technical contents without departing from the technical scope of the present invention, but all the modifications, changes and changes of the technical spirit of the present invention made to the above embodiments are also within the scope of the technical solution of the present invention.
Claims (8)
1. A flue gas waste heat utilization device at the tail part of a boiler of a gas-steam combined cycle backpressure unit is characterized in that a low-pressure steam drum (1) of the combined cycle backpressure unit is connected with a first water inlet of a hot water heater (2) of the boiler through a low-drum water supplementing pipeline (9), and a first water outlet of the hot water heater (2) is connected with the low-pressure steam drum (1);
the first water inlet of the hot water heater (2) is connected with the low-package water replenishing pipeline (9) through a water replenishing conveying pipeline, and an electric door (3) is arranged on the water replenishing conveying pipeline; the first water outlet of the hot water heater (2) is connected with the low-pressure steam drum (1) through a water supplementing loop pipeline (8), and a loop valve (10) is arranged on the water supplementing loop pipeline (8).
2. The gas-steam combined cycle backpressure unit boiler tail flue gas waste heat utilization equipment of claim 1, characterized in that, the moisturizing pipeline is provided with the bypass, and the bypass is provided with the governing door (5) and the manual door (4).
3. The device for utilizing the flue gas waste heat at the tail part of the gas-steam combined cycle back pressure unit boiler according to claim 2, characterized in that two manual doors (4) are respectively arranged at two sides of the adjusting door (5).
4. The gas and steam combined cycle back pressure unit boiler tail flue gas waste heat utilization device according to claim 1, characterized in that a water inlet temperature sensor (11) and a water outlet temperature sensor (12) are respectively arranged on two sides of the hot water heater (2), the water inlet temperature sensor (11) is arranged close to a first water inlet of the hot water heater (2), the water outlet temperature sensor (12) is arranged close to a first water outlet of the hot water heater (2), and the water inlet temperature sensor (11), the water outlet temperature sensor (12) and the electric door (3) are all connected with a controller.
5. The device for utilizing the waste heat of the flue gas at the tail part of the boiler of the gas-steam combined cycle backpressure unit as claimed in claim 4, wherein a flue gas temperature sensor is arranged at an air outlet of a chimney of the combined cycle backpressure unit, and the flue gas temperature sensor is connected with the controller.
6. The gas and steam combined cycle back pressure unit boiler tail flue gas waste heat utilization device of claim 4, characterized in that the controller is a single chip microcomputer.
7. The gas-steam combined cycle back pressure unit boiler tail flue gas waste heat utilization device according to claim 1, characterized in that the hot water heater (2) is further connected with a hot water inlet pipe and a hot water outlet pipe.
8. The gas and steam combined cycle back pressure unit boiler tail flue gas waste heat utilization device according to claim 7, characterized in that a water inlet valve (6) is arranged on the hot water supply water inlet pipeline, and a water outlet valve (7) is arranged on the hot water supply water outlet pipeline.
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| CN202223337867.5U CN218544496U (en) | 2022-12-12 | 2022-12-12 | Boiler tail flue gas waste heat utilization device of gas and steam combined cycle back pressure unit |
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