CN219607418U - Waste heat recovery system of waste heat boiler - Google Patents
Waste heat recovery system of waste heat boiler Download PDFInfo
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- CN219607418U CN219607418U CN202320109786.5U CN202320109786U CN219607418U CN 219607418 U CN219607418 U CN 219607418U CN 202320109786 U CN202320109786 U CN 202320109786U CN 219607418 U CN219607418 U CN 219607418U
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Abstract
The utility model discloses a waste heat recovery system of a waste heat boiler, which is suitable for the waste heat boiler configured by a gas-steam combined cycle unit, and designs a waste heat utilization hot water system at the tail part of the waste heat boiler and a bromine cooler energy supply combined application technology, wherein working medium circulation is performed by a hot water circulating pump by utilizing the existing condensate water, a condensate water heater and a boiler water supply system, so that the energy supply of the bromine cooler is realized; the control mode of the shutdown, starting and adjusting stages of the system is introduced, the flow of the working medium is adjusted by frequency conversion and distribution, the temperature of the working medium is adjusted by three stages of low temperature, medium temperature and high temperature, and the flexible and adjustable energy supply process of the tail waste heat utilization hot water system of the waste heat boiler can be realized.
Description
Technical Field
The utility model relates to a waste heat recovery system of a waste heat boiler, and belongs to the technical field of waste heat boilers in the thermal power generation industry.
Background
The distributed energy system is one of the main types of energy supply and peak shaving in China, and the system generally takes fuel gas as fuel and is configured with a gas-steam combined cycle unit, and the system mainly comprises important host equipment such as a gas turbine, a steam turbine, a waste heat boiler and the like, and part of the units can realize combined heat and power supply and combined heat and power supply so as to meet the energy cascade utilization of various demands of users.
In the tail waste heat utilization technology of the waste heat boiler configured by the existing gas-steam combined cycle unit, the technology for further recovering waste heat by a final-stage economizer is expanded, but the flexible and adjustable waste heat recovery cannot be realized; the mode of adding the heating water heater is adopted, project design, construction difficulty and investment cost are increased, part of process routes cannot fully absorb waste heat at the tail of the boiler, and a certain amount of waste heat is still wasted in the operation of the waste heat boiler.
When the distributed energy system supplies cold, an electric cooler or a bromine cooler is generally configured, and the electric cooler needs to consume electric energy, so that the energy utilization efficiency is low; the bromine cooler needs a heat source to drive, the driving heat source has various forms such as flue gas, hot water, steam and the like, and the hot water source of the hot water type bromine cooler is generally conventional hot water, such as closed circulating water or heat supply network circulating water, so that the water temperature is often not high enough, or the purpose of waste heat utilization cannot be achieved. The tail waste heat of the waste heat boiler is combined with a driving heat source of the bromine cooler, which is a new form of waste heat utilization of the tail waste heat of the waste heat boiler, and no technology capable of meeting the high-efficiency combined application of the tail waste heat utilization of the waste heat boiler and the bromine cooler exists at present.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provide a waste heat recovery system of a waste heat boiler.
The utility model solves the problems by adopting the following technical scheme: the waste heat recovery system of the waste heat boiler is characterized by comprising a hot water circulating pump A, a hot water circulating pump B, a bromine cooler and a condensation water heater, wherein the hot water circulating pump A is sequentially connected with an electric regulating valve A and a manual circulating water valve A, the hot water circulating pump B is sequentially connected with the electric regulating valve B and the manual circulating water valve B, a water outlet end is connected with a circulating water outlet female pipeline and a water inlet end is connected with a bromine cooler water return pipeline after the two pipelines are connected in parallel, the circulating water outlet female pipeline is connected with a condensation water inlet pipeline in parallel and then connected with a condensation water female pipeline, and the condensation water and the manual circulating water female pipeline are provided with a manual circulating water and condensation water female pipeline; the condensation water and the circulating jellyfish pipeline are respectively connected with a condensation water heater water inlet pipeline and a low-temperature adjusting pipeline, and a low-temperature adjusting electric adjusting valve and a low-temperature adjusting manual valve are sequentially arranged on the low-temperature adjusting pipeline; the water inlet pipeline of the condensate water heater is connected to the condensate water heater, and the condensate water heater is connected with the water outlet pipeline of the condensate water heater; the water outlet pipeline of the condensate water heater is respectively connected with a low-pressure drum water supply main pipe of the waste heat boiler and a high-temperature adjusting pipeline, and the high-temperature adjusting pipeline is sequentially provided with a high-temperature adjusting manual valve and a high-temperature adjusting electric adjusting valve; the water heater is connected with a water return pipeline at the middle end of the water heater, and a manual middle-end water return valve and an electric middle-end water return regulating valve are sequentially installed on the water return pipeline at the middle end of the water heater.
Furthermore, the condensation water heater is a final heating surface of the waste heat boiler, one end connected with a water inlet pipeline of the condensation water heater is a water inlet low-temperature end, the condensation water heater is arranged close to the chimney side of the waste heat boiler, and the other end connected with a water outlet pipeline of the condensation water heater is a water outlet high-temperature end.
Further, a water return pipeline at the middle end of the condensation water heater, a high-temperature adjusting pipeline and a low-temperature adjusting pipeline are connected in parallel and then are connected with a water supply pipeline of the bromine cooler, the water supply pipeline of the bromine cooler is respectively connected with a water supply distribution electric adjusting valve of the bromine cooler and the bromine cooler, the bromine cooler is connected with the water return pipeline of the bromine cooler, and a pipeline where the water supply distribution electric adjusting valve of the bromine cooler is connected to the water return pipeline of the bromine cooler; the bromine cooler water supply pipeline is connected with the drain water manual valve and the drain water electric regulating valve through branch pipes, and the connection point of the branch pipes is positioned at the lowest elevation point of the bromine cooler water supply pipeline.
Under normal operation of the waste heat boiler, when the tail waste heat utilization hot water system is in a stop operation stage, a condensate water and circulating jellyfish pipe manual valve is opened, so that condensate water is guaranteed to normally enter a condensate water heater, a bromine cooler, an A hot water circulating pump and a B hot water circulating pump are in stop operation states, and a low-temperature regulation electric regulating valve, a low-temperature regulation manual valve, an A circulating water manual valve, an A regulation electric regulating valve, a B circulating water manual valve, a drainage water electric regulating valve, a high-temperature regulation manual valve, a middle-end backwater manual valve and a middle-end backwater electric regulating valve are in closed states.
Under normal operation of the waste heat boiler, when the tail waste heat utilization hot water system is in a starting stage: method 1: firstly, a drain water manual valve and a drain water electric regulating valve are opened, the drain water electric regulating valve is closed after 180 seconds, a bromine cold machine water supply distribution electric regulating valve is opened, a hot water circulating pump A is started, the circulating water manual valve A, the regulating electric regulating valve A, the low-temperature regulating electric regulating valve and the low-temperature regulating manual valve are opened, after water circulation is established, a middle-end backwater manual valve and a middle-end backwater electric regulating valve are opened, meanwhile, the opening of the low-temperature regulating electric regulating valve is gradually closed, after the temperature reaches a target temperature condition of starting the bromine cold machine, the bromine cold machine is started, then the bromine cold machine water supply distribution electric regulating valve is slowly closed, and the water circulation of the bromine cold machine, the hot water circulating pump A and pipelines thereof is established so as to meet the normal operation of the bromine cold machine; method 2: and (3) starting a hot water circulating pump B, synchronously starting an electric regulating valve B and a circulating water manual valve B, and keeping other operation processes consistent with the method 1.
Under normal operation of the waste heat boiler, when the tail waste heat utilization hot water system is in an adjusting stage, the flow and temperature adjustment of the heat supply working medium can be simultaneously satisfied; the flow of the working medium can be adjusted by frequency conversion of the A hot water circulating pump or the B hot water circulating pump to adjust the water inflow of the bromine cooler, and the water inflow of the bromine cooler can also be adjusted by adjusting the opening of an electric adjusting valve for distributing water supply of the bromine cooler; the temperature of the working medium can be adjusted flexibly by the low-temperature adjusting electric adjusting valve, the high-temperature adjusting electric adjusting valve and the middle-end backwater electric adjusting valve.
For the working medium flow regulation mode, when the working medium flow is required to be increased, the frequency converter frequency of the configuration of the hot water circulating pump A or the hot water circulating pump B is required to be increased; when the flow of working medium needs to be reduced, the frequency of a frequency converter configured by the hot water circulating pump A or the hot water circulating pump B is reduced, or the opening of an electric regulating valve for distributing water to a bromine cooling machine is increased.
For the working medium temperature regulation mode, when the working medium temperature needs to be increased, the opening of the middle-end backwater electric regulating valve is gradually increased, and the opening of the low-temperature regulating electric regulating valve is reduced so as to meet the requirement of the working medium energy supply temperature; when the intermediate-end backwater electric regulating valve of the low-temperature regulating electric regulating valve is fully Guan Ju and still cannot meet the temperature requirement, the high-temperature regulating manual valve is opened, the opening of the high-temperature regulating electric regulating valve is gradually increased, and the opening of the intermediate-end backwater electric regulating valve is reduced, so that the requirement of higher working medium energy supply temperature is met.
Compared with the prior art, the utility model has the following advantages and effects:
1. for a gas-steam combined cycle unit provided with a waste heat boiler, flexible and adjustable waste heat recovery can be realized, and the economy of unit operation is improved;
2. the tail waste heat utilization hot water system and bromine cooler energy supply combined application technology of the waste heat boiler is designed, the existing condensate water, condensate water heater and boiler water supply system are fully utilized, the boiler heating surface is not required to be increased, the equipment cost is low, and the reliability is high;
3. the flow of the working medium is regulated by frequency conversion and distribution, the temperature of the working medium is regulated by three-stage temperature regulation of low temperature, medium temperature and high temperature, the stepless regulation of the enthalpy value of the working medium with allowance can be realized, and the energy supply requirement is fully satisfied;
4. the system starting process can effectively control the temperature so as to reach the starting target temperature of the bromine cold machine and not exceed the standard, and the safe and stable operation of the system is ensured.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the system of the present utility model.
In the figure: the water supply system comprises a condensate water inlet pipeline 1, a condensate water and circulating jellyfish pipe manual valve 2, a condensate water and circulating jellyfish pipeline 3, a condensate water heater inlet pipeline 4, a low-temperature regulation electric regulating valve 5, a low-temperature regulation pipeline 6, a low-temperature regulation manual valve 7, a circulating water outlet parent pipeline 8, an A circulating water manual valve 9, an A regulation electric regulating valve 10, an A hot water circulating pump 11, a B hot water circulating pump 12, a B regulation electric regulating valve 13, a B circulating water manual valve 14, a bromine cooler water return pipeline 15, a bromine cooler 16, a bromine cooler water supply pipeline 17, a drainage manual valve 18, a drainage electric regulating valve 19, a high-temperature regulation electric regulating valve 20, a high-temperature regulation pipeline 21, a high-temperature regulation manual valve 22, a middle-end water return pipeline 23 of a condensate water heater, a middle-end water return manual valve 24, a middle-end water return electric regulating valve 25, a condensate water heater 26, a condensate water heater outlet pipeline 27, a waste heat boiler low-pressure package water supply parent pipeline 28 and a bromine cooler water supply distribution electric regulating valve 29.
Detailed Description
The present utility model will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present utility model and not limited to the following examples.
Examples.
In the embodiment, a distributed energy resource station item of an ecological industrial park is configured with a 2×59MW gas-steam combined cycle thermoelectric cooling triple supply unit, and a set of combined cycle generator set consists of a gas turbine, a steam turbine, two generators and a waste heat boiler and related equipment. During the operation of the combined cycle unit, the gas turbine is a unit prime motor, natural gas is used as fuel, hot exhaust gas of the gas turbine enters the waste heat boiler to exchange heat with the tube panels of each heat exchanger, water fed by the heating boiler is heated to generate superheated steam, and the steam enters the steam turbine to apply work to drive the generator to generate electricity.
The waste heat boiler is provided with a waste heat recovery system of the waste heat boiler, and the waste heat utilization hot water system of the tail part of the waste heat boiler and the energy supply combined application technology of the bromine cooling machine are adopted, so that the flexible and adjustable energy supply process of the waste heat utilization hot water system of the tail part of the waste heat boiler is realized. The system comprises a condensate water inlet pipeline 1, a condensate water and circulating jellyfish pipe manual valve 2, a condensate water and circulating jellyfish pipe 3, a condensate water heater inlet pipeline 4, a low-temperature adjusting electric adjusting valve 5, a low-temperature adjusting pipeline 6, a low-temperature adjusting manual valve 7, a circulating water outlet parent pipeline 8, an A circulating water manual valve 9, an A adjusting electric adjusting valve 10, an A hot water circulating pump 11, a B hot water circulating pump 12, a B adjusting electric adjusting valve 13, a B circulating water manual valve 14, a bromine cooler water return pipeline 15, a bromine cooler 16, a bromine cooler water supply pipeline 17, a drainage manual valve 18, a drainage water electric adjusting valve 19, a high-temperature adjusting electric adjusting valve 20, a high-temperature adjusting pipeline 21, a high-temperature adjusting manual valve 22, a condensate water heater middle-end return water pipe 23, a middle-end return water manual valve 24, a middle-return electric adjusting valve 25, a condensate water heater 26, a condensate water outlet pipeline 27, a waste heat boiler low-pressure drum water supply parent pipe 28 and a bromine cooler water supply distribution electric adjusting valve 29.
The hot water circulating pump 11 is sequentially connected with the A regulation electric regulating valve 10 and the A circulating water manual valve 9, the B hot water circulating pump 12 is sequentially connected with the B regulation electric regulating valve 13 and the B circulating water manual valve 14, the water outlet end of the two pipelines is connected with the circulating water outlet female pipeline 8 after being connected in parallel, the water inlet end of the two pipelines is connected with the bromine cooler water return pipeline 15, the circulating water outlet female pipeline 8 is connected with the condensed water inlet pipeline 1 in parallel and then connected with the condensed water and circulating water female pipeline 3, and the condensed water and circulating water female pipeline 3 is provided with the condensed water and circulating water female pipe manual valve 2; the condensate water and the circulating jellyfish pipeline 3 are respectively connected with a condensate water heater water inlet pipeline 4 and a low-temperature adjusting pipeline 6, and a low-temperature adjusting electric adjusting valve 5 and a low-temperature adjusting manual valve 7 are sequentially arranged on the low-temperature adjusting pipeline 6; the condensate water heater inlet pipe 4 is connected to a condensate water heater 26, and the condensate water heater 26 is connected with a condensate water heater outlet pipe 27; the water outlet pipeline 27 of the condensing water heater is respectively connected with the low-pressure drum water supply main pipe 28 of the waste heat boiler and the high-temperature adjusting pipeline 21, and the high-temperature adjusting pipeline 21 is sequentially provided with a high-temperature adjusting manual valve 22 and a high-temperature adjusting electric adjusting valve 20; the condensate water heater 26 is connected with a condensate water heater middle-end return water pipeline 23, and the condensate water heater middle-end return water pipeline 23 is sequentially provided with a middle-end return water manual valve 24 and a middle-end return water electric regulating valve 25.
The condensate water heater 26 is a final heating surface of the waste heat boiler, one end connected with the condensate water heater water inlet pipeline 4 is a water inlet low-temperature end, the condensate water heater is arranged close to the chimney side of the waste heat boiler, and the other end connected with the condensate water heater water outlet pipeline 27 is a water outlet high-temperature end.
The middle end water return pipeline 23, the high-temperature adjusting pipeline 21 and the low-temperature adjusting pipeline 6 of the condensing water heater are connected in parallel and then connected with the water supply pipeline 17 of the bromine cooler, the water supply pipeline 17 of the bromine cooler is respectively connected with the water supply distribution electric adjusting valve 29 of the bromine cooler and the bromine cooler 16, the bromine cooler 16 is connected with the water return pipeline 15 of the bromine cooler, and the pipeline where the water supply distribution electric adjusting valve 29 of the bromine cooler is located is connected to the water return pipeline 15 of the bromine cooler; the bromine cooler water supply pipeline 17 is connected with a drain manual valve 18 and a drain water power regulating valve 19 through branch pipes, and the connection point of the branch pipes is positioned at the lowest elevation point of the bromine cooler water supply pipeline 17.
Under normal operation of the waste heat boiler, when the tail waste heat utilization hot water system is in a shutdown stage, the condensate water and the circulating jellyfish pipe manual valve 2 are opened, the condensate water is guaranteed to normally enter the condensate water heater 26, the bromine cooler 16, the A hot water circulating pump 11 and the B hot water circulating pump 12 are in a shutdown state, and the low-temperature regulation electric regulating valve 5, the low-temperature regulation manual valve 7, the A circulating water manual valve 9, the A regulation electric regulating valve 10, the B regulation electric regulating valve 13, the B circulating water manual valve 14, the drainage manual valve 18, the drainage water electric regulating valve 19, the high-temperature regulation electric regulating valve 20, the high-temperature regulation manual valve 22, the middle-end backwater manual valve 24 and the middle-end backwater electric regulating valve 25 are in a closed state.
Under normal operation of the waste heat boiler, when the tail waste heat utilization hot water system is in a starting stage, firstly, the drain manual valve 18 and the drain water power regulating valve 19 are opened, the drain water power regulating valve 19 is closed after 180 seconds, the bromine cold machine water supply distribution electric regulating valve 29 is opened, the A hot water circulating pump 11 is started, the A circulating water manual valve 9, the A regulating electric regulating valve 10, the low temperature regulating electric regulating valve 5 and the low temperature regulating manual valve 7 are opened, after water circulation is established, the middle-end backwater manual valve 24 and the middle-end backwater electric regulating valve 25 are opened, meanwhile, the opening of the low temperature regulating electric regulating valve 5 is gradually closed, the bromine cold machine 16 is started after the temperature reaches the bromine cold machine starting target temperature of 90 ℃, then the bromine cold machine water supply distribution electric regulating valve 29 is slowly closed, and the bromine cold machine 16, the A hot water circulating pump 11 and the water circulation of pipelines of the A hot water circulating pump are established, so that normal operation of the bromine cold machine 16 is met.
Under normal operation of the waste heat boiler, when the tail waste heat utilization hot water system is in an adjusting stage, the water supply temperature of the bromine cooler is 100 ℃, the water supply temperature of the bromine cooler is required to be adjusted to 125 ℃ to meet energy supply requirements, the opening of the middle-end backwater electric adjusting valve 25 is gradually increased, the opening of the low-temperature adjusting electric adjusting valve 5 is reduced, when the low-temperature adjusting electric adjusting valve 5 is fully closed and the middle-end backwater electric adjusting valve 25 is fully opened, the water supply temperature of the bromine cooler is adjusted to 120 ℃, then the high-temperature adjusting manual valve 22 is opened, the opening of the high-temperature adjusting electric adjusting valve 20 is gradually increased to 8%, and when the opening of the middle-end backwater electric adjusting valve 25 is reduced to 85%, the water supply temperature of the bromine cooler reaches 125 ℃ to be a specified value, and the energy supply temperature requirements of the waste heat utilization hot water system are met.
What is not described in detail in this specification is all that is known to those skilled in the art.
Although the present utility model has been described with reference to the above embodiments, it should be understood that the utility model is not limited to the embodiments described above, but is capable of modification and variation without departing from the spirit and scope of the present utility model.
Claims (4)
1. The waste heat recovery system of the waste heat boiler is characterized by comprising an A hot water circulating pump (11), a B hot water circulating pump (12), a bromine cooler (16) and a condensate water heater (26), wherein the A hot water circulating pump (11) is sequentially connected with an A regulating electric regulating valve (10) and an A circulating water manual valve (9), the B hot water circulating pump (12) is sequentially connected with a B regulating electric regulating valve (13) and a B circulating water manual valve (14), a pipeline where the A hot water circulating pump (11) is positioned is connected with a pipeline where the B hot water circulating pump (12) is positioned in parallel, a water outlet end is connected with a circulating water outlet mother pipeline (8), a water inlet end is connected with a bromine cooler return pipeline (15), the circulating water outlet mother pipeline (8) is connected with a condensate water inlet pipeline (1) in parallel and then connected with the condensate water and the circulating water mother pipeline (3), and the condensate water and circulating water mother pipeline (3) is provided with the condensate water and circulating water mother pipeline manual valve (2); the condensation water and the circulating jellyfish pipeline (3) are respectively connected with a condensation water heater water inlet pipeline (4) and a low-temperature adjusting pipeline (6), and a low-temperature adjusting electric adjusting valve (5) and a low-temperature adjusting manual valve (7) are sequentially arranged on the low-temperature adjusting pipeline (6); the water inlet pipeline (4) of the condensate water heater is connected to the condensate water heater (26), and the condensate water heater (26) is connected with a water outlet pipeline (27) of the condensate water heater; the water outlet pipeline (27) of the condensate water heater is respectively connected with a low-pressure drum water supply main pipe (28) and a high-temperature adjusting pipeline (21) of the waste heat boiler, and the high-temperature adjusting pipeline (21) is sequentially provided with a high-temperature adjusting manual valve (22) and a high-temperature adjusting electric adjusting valve (20).
2. Waste heat recovery system of waste heat boiler according to claim 1, characterized in that the condensation water heater (26) is a final heating surface of the waste heat boiler, one end connected with the water inlet pipe (4) of the condensation water heater is a water inlet low temperature end, the water inlet low temperature end is arranged close to the chimney side of the waste heat boiler, and the other end connected with the water outlet pipe (27) of the condensation water heater is a water outlet high temperature end.
3. Waste heat recovery system of waste heat boiler according to claim 2, characterized in that the condensate water heater (26) is connected with a condensate water heater middle-end return water pipeline (23), and the condensate water heater middle-end return water pipeline (23) is sequentially provided with a middle-end return water manual valve (24) and a middle-end return water electric regulating valve (25); the water supply pipeline (17) of the bromine cooler is connected in parallel with the water return pipeline (23), the high-temperature adjusting pipeline (21) and the low-temperature adjusting pipeline (6) at the middle end of the condensation water heater, the water supply pipeline (17) of the bromine cooler is respectively connected with the electric control valve (29) for distributing water of the bromine cooler and the bromine cooler (16), the bromine cooler (16) is connected with the water return pipeline (15) of the bromine cooler, and the pipeline where the electric control valve (29) for distributing water of the bromine cooler is connected to the water return pipeline (15) of the bromine cooler.
4. A waste heat recovery system of a waste heat boiler according to claim 3, wherein the bromine cooler water supply pipeline (17) is connected with a drain water manual valve (18) and a drain water electric regulating valve (19) through branch pipes, and the connection point of the branch pipes is positioned at the lowest elevation point of the bromine cooler water supply pipeline (17).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320109786.5U CN219607418U (en) | 2023-01-18 | 2023-01-18 | Waste heat recovery system of waste heat boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320109786.5U CN219607418U (en) | 2023-01-18 | 2023-01-18 | Waste heat recovery system of waste heat boiler |
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| CN219607418U true CN219607418U (en) | 2023-08-29 |
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| CN202320109786.5U Active CN219607418U (en) | 2023-01-18 | 2023-01-18 | Waste heat recovery system of waste heat boiler |
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2023
- 2023-01-18 CN CN202320109786.5U patent/CN219607418U/en active Active
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