CN213300061U - Heat and power cogeneration cooling water heat step recovery system - Google Patents
Heat and power cogeneration cooling water heat step recovery system Download PDFInfo
- Publication number
- CN213300061U CN213300061U CN202021780343.1U CN202021780343U CN213300061U CN 213300061 U CN213300061 U CN 213300061U CN 202021780343 U CN202021780343 U CN 202021780343U CN 213300061 U CN213300061 U CN 213300061U
- Authority
- CN
- China
- Prior art keywords
- water
- heat
- cooler
- heat exchanger
- inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a combined heat and power generation cooling water heat step recovery system, with the generator air cooler, the coolant of sample cooler changes into demineralized water by the service cooling water, and add in demineralized water system and even arrange flash tank drainage heat exchanger and oxygen-eliminating device operation steam exhaust heat exchanger in order to retrieve the heat, when reducing the service cooling water demand, still abundant recycle generator air cooler, the sample cooler, even arrange the heat dissipation of flash tank drainage and oxygen-eliminating device operation steam exhaust, further reduce waste heat discharge. In a thermoelectric project with 2 × 15MW back pressure unit capacity, the load of recovering heat is about 1.1MW, i.e. about 31680GJ can be supplied more heat in one year, which corresponds to about 1220 t/year of standard coal saving.
Description
Technical Field
The utility model belongs to the technical field of the energy, concretely relates to combined heat and power generation cooling water heat step recovery system.
Background
In the conventional design of recovering the heat dissipation capacity of the thermal power plant equipment, in order to improve the heat economy performance of the unit and reduce the demand of service water cooling, the conventional cogeneration unit is provided with a steam seal cooler and a slag cooler which are cooled by supplementing demineralized water (as shown in fig. 1), and the heat dissipation capacity is brought into a boiler for recycling. The desalination water system is simple, and the cooling water requirements of the generator air cooler and the sampling cooler are still met by the service water system; the recycling of the heat dissipation of the drainage of the continuous discharge flash tank and the operation exhaust of the deaerator is generally not considered, and the heat is directly dissipated to the environment. With the improvement of the operation and maintenance level of the thermal power plant, new requirements on energy conservation and consumption reduction of the unit are provided.
SUMMERY OF THE UTILITY MODEL
For further reducing the waste heat discharge, improve the thermal efficiency of combined heat and power units, the utility model provides a combined heat and power cooling water heat capacity step recovery system changes generator air cooler, the coolant of sample cooler into demineralized water by the service cooling water, and add in demineralized water system and even arrange flash tank drainage heat exchanger and the heat exchanger of oxygen-eliminating device operation steam extraction in order to retrieve the heat, when reducing service water cooling demand, still abundant recycle generator air cooler, the sample cooler, even arrange the heat dissipation of flash tank drainage and oxygen-eliminating device operation steam extraction, further reduce the waste heat discharge.
The above purpose of the invention is realized by the following technical scheme:
the heat and power cogeneration cooling water heat gradient recovery system is characterized in that a generator air cooler and a sampling cooler which are changed from a circulating cooling water system are additionally arranged in a desalted water system, and a continuous discharge flash tank drainage heat exchanger and a deaerator running steam discharge heat exchanger are additionally arranged in the desalted water system; a demineralized water supply pump of a water preparation workshop is connected with a cold water inlet of a generator air cooler through a pipeline, an outlet of the generator air cooler is divided into three branch pipes through a water supply main pipe and is respectively connected with a water side inlet of a slag cooler, a water side inlet of a gland seal cooler and a water side inlet of a sampling cooler, the water side outlet of the slag cooler is connected with a water side inlet of a continuous discharge flash tank drainage heat exchanger through a pipeline, the water side outlet of the continuous discharge flash tank drainage heat exchanger is connected with a water storage tank inlet through a pipeline, the water side outlet of the gland seal cooler is connected with a water storage tank inlet through a pipeline, and the water side outlet of the sampling cooler is connected with; the outlet of the water storage tank is connected with the water side inlet of the deaerator operation steam exhaust heat exchanger through a delivery pump and a pipeline, and the water side outlet of the deaerator operation steam exhaust heat exchanger is connected with the inlet of the boiler water supply tank through a pipeline.
Compared with the prior art, the utility model discloses following beneficial effect has:
the desalting water sent to a boiler water supply tank is used as a cooling medium of a generator air cooler and a sampling cooler in the cogeneration unit, and a continuous-row flash tank drainage heat exchanger and a deaerator operation steam exhaust heat exchanger are arranged in a desalting water system to recover heat, so that a working medium can utilize waste heat before entering a boiler as much as possible, and the heating quantity of the working medium required in the boiler is effectively reduced. In a thermoelectric project with 2 × 15MW back pressure unit capacity, the load of recovering heat is about 1.1MW, i.e. about 31680GJ can be supplied more heat in one year, which corresponds to about 1220 t/year of standard coal saving.
The demineralized water system before the boiler feed-tank entry in the combined heat and power unit, design cooling water heat recovery scheme, carried out hierarchical series heating and flow distribution according to temperature gradient for retrieve the heat dissipation capacity of generator air cooler, sample cooler, even arrange flash tank drainage and oxygen-eliminating device operation steam extraction. The system flow optimization is particularly suitable for small-sized thermoelectric engineering, and can be popularized to thermal power plants and thermal power plant projects with larger capacity.
Drawings
FIG. 1 is a schematic diagram of a conventional design structure for recovering heat dissipated by a cogeneration unit;
FIG. 2 is a schematic structural view of a heat and power cogeneration cooling water heat step recovery system of the present invention;
FIG. 3 is a schematic diagram of the recirculating cooling water system after the generator air cooler and the sample cooler in the recirculating cooling water system have been modified to the demineralized water system;
fig. 4 is a schematic view of the heat step recovery process of the cogeneration cooling water heat step recovery system of the present invention.
Reference numerals: 1-generator air cooler, 2-sampling cooler, 3-continuous discharge flash tank drainage heat exchanger, 4-deaerator operation steam discharge heat exchanger, 5-air seal cooler, 6-slag cooler, 7-boiler water supply tank, 8-water storage tank, 9-water storage tank delivery pump, 10-demineralized water supply pump, 11-boiler fan cooler and 12-oil cooler.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 2, in the cogeneration cooling water heat step recovery system, a generator air cooler 1 and a sampling cooler 2 in a circulating cooling water system are replaced by a demineralized water system, that is, the generator air cooler 1 and the sampling cooler 2 replaced by the circulating cooling water system are added in the demineralized water system; a continuous discharge flash tank drainage heat exchanger 3 and a deaerator operation steam discharge heat exchanger 4 are additionally arranged in the desalination water system; a demineralized water supply pump 10 of a water preparation workshop is connected with a cold water inlet of a generator air cooler 1 through a pipeline, an outlet of the generator air cooler 1 is divided into three branch pipes through a water supply main pipe and is respectively connected with a water side inlet of a slag cooler 6, a water side inlet of a gland seal cooler 5 and a water side inlet of a sampling cooler 2, the water side outlet of the slag cooler 6 is connected with a water side inlet of a continuous discharge flash tank drainage heat exchanger 3 through a pipeline, the water side outlet of the continuous discharge flash tank drainage heat exchanger 3 is connected with an inlet of a water storage tank 8 through a pipeline, the water side outlet of the gland seal cooler 5 is connected with an inlet of the water storage tank 8 through a pipeline, and the water side outlet of the sampling cooler 2; an outlet of the water storage tank 8 is connected with a water side inlet of a deaerator operation steam exhaust heat exchanger 4 through a delivery pump 9 and a pipeline, and a water side outlet of the deaerator operation steam exhaust heat exchanger 4 is connected with an inlet of a boiler water supply tank 7 through a pipeline.
The step recovery method of the heat of the cogeneration cooling water corresponding to the step recovery system of the heat of the cogeneration cooling water is to take the desalted water sent to a boiler water supply tank as a cooling medium of a generator air cooler and a sampling cooler, and a continuous discharge flash tank drainage heat exchanger and a deaerator operation steam discharge heat exchanger are additionally arranged in the desalted water system to recover the heat, and the method specifically comprises the following steps:
as shown in fig. 4, the marked mark in fig. 4 indicates the gain effect of the present invention, and the line and the arrow indicate the end point and the flow direction of the pipe connection. The heat supply of the thermal power plant is to send the steam exhausted by the steam turbine to a heat user, the user receives the condensed water from the water making workshop of the thermal power plant to form a closed cycle if the condensed water is returned, and the system is an open system of the figure 4 if no condensed water is returned. The starting point of the working medium thermodynamic system can be calculated from a water production plant, and the end point is a heat user. The piping after the boiler feed water tank is commonly referred to as the feedwater system and the steam system, and the system before the boiler feed water tank may be referred to as the desalination system. The utility model discloses a combined heat and power generation cooling water heat step recovery system is from the cooling water heat step recovery system between the system water workshop to the boiler feed tank.
The heat supply of the thermal power plant is to send the steam exhausted by the steam turbine with certain temperature and pressure to the heat consumer, the heat source of the working medium is mainly to absorb the heat energy in the boiler directly, and the heat source and a small part are a plurality of heat dissipation devices utilized in the demineralized water replenishing flow. After the water supply pump 10 of the water production plant is pressurized, the pipeline conveys the demineralized water to a cold water inlet of the generator air cooler 1, and hot air heat in a cooling air duct of the generator is absorbed in the generator air cooler 1. The desalted water at the outlet of the generator air cooler is divided into three branch pipes on a desalted water supply main pipe to cool a water side inlet of a slag cooler 6, a water side inlet of a steam seal cooler 5 and a water side inlet of a sampling cooler 2, and the desalted water flows into a water storage tank 8 from an outlet of a heat dissipation device after absorbing coal slag heat, shaft seal steam heat and sampling steam heat respectively; wherein the water side outlet pipeline of the slag cooler is continuously connected in series to the inlet of the drainage heat exchanger 3 of the continuous drainage flash tank, the heat of the sewage is absorbed by the surface heat exchanger, and then the desalted water of the branch also flows into the water storage tank 8. The desalted water is conveyed to the water side inlet of the deaerator operation steam exhaust heat exchanger through a water storage tank conveying pump at the outlet of the water storage tank, and the desalted water reaches the inlet 7 of the end-point boiler water supply tank of the desalted water system after absorbing the heat of the exhaust steam.
Will the utility model discloses a combined heat and power generation cooling water heat quantity step recovery system is applied to the combined heat and power generation project engineering of the three auspicious thermoelectricity limited company of Nanning, project address: Guangxi-Dong alliance economic technology development area Ningwulu No. 7, installation scale: 2 90t/h +1 130t/h boilers are matched with 2 15MW back pressure units, and the two units can reach the expected target under each operating condition, so that the load of the recovered heat is about 1.1MW, namely, about 31680GJ can be supplied with heat more one year, which is equivalent to about 1220 t/year of standard coal saving.
Claims (1)
1. Cogeneration cooling water heat step recovery system, its characterized in that: a generator air cooler and a sampling cooler which are changed from a circulating cooling water system are additionally arranged in the desalted water system, and a continuous discharge flash tank drainage heat exchanger and a deaerator running exhaust steam heat exchanger are additionally arranged in the desalted water system; a demineralized water supply pump of a water preparation workshop is connected with a cold water inlet of a generator air cooler through a pipeline, an outlet of the generator air cooler is divided into three branch pipes through a water supply main pipe and is respectively connected with a water side inlet of a slag cooler, a water side inlet of a gland seal cooler and a water side inlet of a sampling cooler, the water side outlet of the slag cooler is connected with a water side inlet of a continuous discharge flash tank drainage heat exchanger through a pipeline, the water side outlet of the continuous discharge flash tank drainage heat exchanger is connected with a water storage tank inlet through a pipeline, the water side outlet of the gland seal cooler is connected with a water storage tank inlet through a pipeline, and the water side outlet of the sampling cooler is connected with; the outlet of the water storage tank is connected with the water side inlet of the deaerator operation steam exhaust heat exchanger through a delivery pump and a pipeline, and the water side outlet of the deaerator operation steam exhaust heat exchanger is connected with the inlet of the boiler water supply tank through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021780343.1U CN213300061U (en) | 2020-08-24 | 2020-08-24 | Heat and power cogeneration cooling water heat step recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021780343.1U CN213300061U (en) | 2020-08-24 | 2020-08-24 | Heat and power cogeneration cooling water heat step recovery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213300061U true CN213300061U (en) | 2021-05-28 |
Family
ID=76026975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021780343.1U Active CN213300061U (en) | 2020-08-24 | 2020-08-24 | Heat and power cogeneration cooling water heat step recovery system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213300061U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109532A (en) * | 2021-10-22 | 2022-03-01 | 中盐安徽红四方股份有限公司 | Steam seal cooling and recycling system of steam turbine |
-
2020
- 2020-08-24 CN CN202021780343.1U patent/CN213300061U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109532A (en) * | 2021-10-22 | 2022-03-01 | 中盐安徽红四方股份有限公司 | Steam seal cooling and recycling system of steam turbine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109681281B (en) | Biomass cogeneration system capable of simultaneously recovering exhaust steam and flue gas waste heat | |
| CN104763484B (en) | Air cooling turbine high back pressure heat supply power generating simultaneously method | |
| CN202195715U (en) | Power plant steam-water system with an exhaust steam heat exchange system | |
| CN106196229A (en) | Air-introduced machine steam turbine low-vacuum-operating circulating water heating system and power-economizing method thereof | |
| CN213300061U (en) | Heat and power cogeneration cooling water heat step recovery system | |
| CN202066096U (en) | Supercritical direct air-cooling heat-supply network drainage system of heat supply unit | |
| CN202813542U (en) | Waste heat extracting and heat supply stepped heating system in power plant | |
| CN216741653U (en) | Floating Production and Storage Oil (FPSO) driving system based on nuclear power | |
| CN215062308U (en) | Condensate water supplementary heating system under low-pressure cylinder zero-output operation mode | |
| CN213980964U (en) | Cold and heat quantity optimal utilization system between coal press of low-heat-value combined cycle unit | |
| CN209960462U (en) | Device for heating boiler feed water by utilizing heat pump to absorb waste heat of steam turbine | |
| CN210799058U (en) | Steam-water double-pressure waste heat power generation system | |
| CN212837985U (en) | Electrolytic aluminum cell side wall waste heat recovery system | |
| CN114046189A (en) | Floating Production and Storage Oil (FPSO) driving system based on nuclear power | |
| CN209840253U (en) | Heat pump system for power plant waste heat cold and hot coupling utilization | |
| CN209744495U (en) | Double-backpressure and heat pump combined heating system of air cooling unit with power of more than 300MW | |
| CN206310568U (en) | Feed pump turbine low-vacuum-operating circulating water heating system | |
| CN218206812U (en) | Comprehensive steam recycling system | |
| CN111396160A (en) | Flue gas waste heat cogeneration system and cogeneration method | |
| CN216240846U (en) | Differential pressure cold energy comprehensive utilization device of gas power plant | |
| CN111396164A (en) | System and method for recycling waste heat of side wall of electrolytic aluminum cell | |
| CN214406013U (en) | Novel tail waste heat cascade comprehensive utilization system of H-level gas turbine waste heat boiler | |
| CN218820594U (en) | Cogeneration energy storage peak regulation system based on steam supply, drainage and recycling | |
| CN213746659U (en) | Waste heat recycling system in insulating plate production process | |
| CN217843913U (en) | Flue gas waste heat utilization system of thermal power plant based on seawater desulfurization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |