CN215311360U - System for preparing denitration urea solution by using flue gas waste heat of gas-steam combined cycle unit - Google Patents
System for preparing denitration urea solution by using flue gas waste heat of gas-steam combined cycle unit Download PDFInfo
- Publication number
- CN215311360U CN215311360U CN202120749621.5U CN202120749621U CN215311360U CN 215311360 U CN215311360 U CN 215311360U CN 202120749621 U CN202120749621 U CN 202120749621U CN 215311360 U CN215311360 U CN 215311360U
- Authority
- CN
- China
- Prior art keywords
- gas
- heat exchange
- water
- waste heat
- pipeline
- 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
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model discloses a system for preparing a denitration urea solution by using flue gas waste heat of a gas-steam combined cycle unit, which belongs to the technical field of waste heat utilization and comprises the gas-steam combined cycle unit, a waste heat boiler and a chimney, wherein the gas-steam combined cycle unit, the waste heat boiler and the chimney are sequentially communicated; the device comprises a waste heat boiler, a chimney and a urea dissolving tank, and is characterized by further comprising a gas-water heat exchange device, a urea dissolving tank and a desalting water tank, wherein the gas-water heat exchange device is arranged on a tail flue between an outlet of the waste heat boiler and the chimney, the gas-water heat exchange device is connected with a heat exchange pipeline, the heat exchange pipeline is wound on the outer wall of the urea dissolving tank, the heat exchange pipeline is connected into the desalting water tank, the desalting water tank is connected into the urea dissolving tank through a desalting water supply pipeline, the desalting water tank is connected to the gas-water heat exchange device through a circulating water pipeline, and a urea solution temperature and liquid level measuring device is arranged in the urea dissolving tank. The utility model has simple process, can effectively reduce the exhaust gas temperature and improve the economy of the unit.
Description
Technical Field
The utility model belongs to the technical field of waste heat utilization, and particularly relates to a process system for preparing a denitration urea solution by using waste heat of tail flue gas of a gas-steam combined cycle unit.
Background
The exhaust gas temperature of the existing gas-steam combined cycle unit is still kept about 100 ℃ after the exhaust gas is utilized by a waste heat boiler, and the exhaust gas temperature is relatively high, so that the heat economy of the unit is influenced. The natural gas composition in China is considered to have low sulfur content and ash content, and the flue gas after combustion is relatively clean, so that good conditions are created for recycling the tail flue gas waste heat. To control the gas turbine NOXThe exhaust concentration, install SCR denitrification facility additional in exhaust-heat boiler, when adopting urea as the reductant, for the urea solution crystallization when low temperature environment of preventing 40% ~50% concentration of preparation, increase steam heating system in urea dissolving tank usually to improve the temperature of urea solution, this set of system increases the consumption of outside heat source, and the economic nature is relatively poor.
Aiming at the problems, the utility model provides a process system for preparing a denitration urea solution by using the waste heat of the tail flue gas of a gas-steam combined cycle unit, which is characterized in that a set of gas-water heat exchange device is additionally arranged, the waste heat of the tail flue gas of the gas-steam combined cycle unit is used as a heat source for improving the dissolving temperature of urea, the exhaust gas temperature at the tail of the gas-steam combined cycle unit can be reduced, and the stable operation of the preparation of the urea solution can be ensured.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art, and provides the system for preparing the denitration urea solution by using the flue gas waste heat of the gas-steam combined cycle unit, which has the advantages of simple process and strong operability, not only can fully utilize the flue gas waste heat at the tail of the unit, but also is beneficial to the preparation of the urea solution, improves the economic benefit of the unit, and simultaneously ensures the stable preparation operation of the reducing agent system of the SCR denitration system.
The technical scheme adopted by the utility model for solving the problems is as follows: a system for preparing a denitration urea solution by using flue gas waste heat of a gas-steam combined cycle unit comprises the gas-steam combined cycle unit, a waste heat boiler and a chimney, wherein the gas-steam combined cycle unit, the waste heat boiler and the chimney are sequentially communicated; it is characterized by also comprising a gas-water heat exchange device, a urea dissolving tank and a desalting water tank, wherein the gas-water heat exchange device is arranged on a tail flue between an outlet of the waste heat boiler and a chimney, the gas-water heat exchange device is connected with a heat exchange pipeline, the heat exchange pipeline is wound on the outer wall of the urea dissolving tank, then the heat exchange pipeline is connected into a desalting water tank, the desalting water tank is also connected with a desalting water replenishing pipeline, meanwhile, the demineralized water tank is connected to the urea dissolving tank through a demineralized water supply pipeline, a water supply pump is arranged on the demineralized water supply pipeline, and the desalting water tank is connected to the gas-water heat exchange device through a circulating water pipeline, the circulating water pipeline is sequentially connected with a circulating water pump, a stop valve, an automatic flow regulating device and a temperature and pressure measuring meter, and a urea solution temperature and liquid level measuring device is arranged in the urea dissolving tank.
Furthermore, the desalted water comes from a water production workshop, and the desalted water after heat exchange is used for urea dissolution heat preservation and urea solution preparation.
Furthermore, the gas-water heat exchange device is arranged in a countercurrent mode, and the pipe material of the gas-water heat exchange device is preferably a stainless steel pipe with high heat transfer coefficient so as to improve the heat exchange capacity.
Furthermore, the desalted water after heat exchange by the gas-water heat exchange device flows through the outer wall of the urea dissolving tank through a heat exchange pipeline and is used for preserving the heat of the solution in the urea dissolving tank in an indirect water-water heat exchange mode.
Further, the desalted water after heat exchange is consumed by the prepared urea solution and is supplemented by desalted water of a water preparation workshop.
Further, a part of the desalted water entering the desalted water tank after heat exchange is sent to the urea dissolving tank by a feed water pump for preparing urea solution, and the redundant desalted water is sent to the gas-water heat exchange device by a circulating water pump for recycling.
Furthermore, the automatic flow regulating device and the temperature and pressure measuring meter are used for controlling and regulating the water supply flow entering the air-water heat exchange device and the supply amount of the desalted water in the water making workshop, so that the running stability of the system is ensured.
Compared with the prior art, the utility model has the following advantages and effects: the device has simple process, the heat source adopts the waste heat of the tail flue gas of the gas-steam combined cycle unit, the operability is strong, the exhaust gas temperature can be effectively reduced, and the economical efficiency of the unit is improved; meanwhile, the desalted water after heat exchange is used for preparing the flue gas denitration urea solution, and heat preservation is carried out on the flue gas denitration urea solution, so that the crystallization problem can be avoided, and the method has good environmental protection benefit and economic benefit and wide application prospect.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: the system comprises a gas-steam combined cycle unit 1, a waste heat boiler 2, a chimney 3, a demineralized water replenishing pipeline 4, a gas-water heat exchange device 5, a urea dissolving tank 6, a demineralized water tank 7, a water feed pump 8, a circulating water pump 9, a stop valve 10, an automatic flow regulating device 11, a temperature and pressure measuring meter 12 and a urea solution temperature and liquid level measuring device 13.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1, in this embodiment, a system for preparing a denitration urea solution by using flue gas waste heat of a gas-steam combined cycle unit includes a gas-steam combined cycle unit 1, a waste heat boiler 2 and a chimney 3, wherein the gas-steam combined cycle unit 1, the waste heat boiler 2 and the chimney 3 are sequentially communicated; the device is characterized by further comprising a gas-water heat exchange device 5, a urea dissolving tank 6, a desalting water tank 7 and the like, wherein the gas-water heat exchange device 5 is arranged on a tail flue between an outlet of the waste heat boiler 2 and a chimney 3 in a countercurrent mode, the gas-water heat exchange device 5 is connected with a heat exchange pipeline, the heat exchange pipeline is wound on the outer wall of the urea dissolving tank 6 and then connected into the desalting water tank 7, the desalting water tank 7 is also connected with a desalting water replenishing pipeline 4, the desalting water tank 7 is connected into the urea dissolving tank 6 through a desalting water supplying pipeline, a water feeding pump 8 is installed on the desalting water supplying pipeline, the desalting water tank 7 is connected to the gas-water heat exchange device 5 through a circulating water pipeline, and the circulating water pipeline is sequentially connected with a circulating water pump 9, a stop valve 10, an automatic flow regulating device 11 and a temperature and pressure measuring meter 12, and a urea solution temperature and liquid level measuring device 13 is arranged in the urea dissolving tank 6.
The working method comprises the following steps: high-temperature flue gas generated by combustion of fuel gas in the fuel gas-steam combined cycle unit 1 is utilized by the waste heat boiler 2, and then tail gas is discharged from a chimney 3. The circulating water pump 9 drives the demineralized water to pass through the air-water heat exchange device 5 for heat preservation of the urea dissolving tank 6, the effluent enters the demineralized water tank 7, one part of the effluent is sent into the urea dissolving tank 6 through the water feed pump 8 for preparing the urea solution, the preparation of the urea solution is controlled by the urea solution temperature and liquid level measuring device 13, and the redundant demineralized water is recycled; after being consumed by the prepared urea solution, the desalted water is supplemented by desalted water of a water making workshop; a stop valve 10 and an automatic flow regulating device 11 which are arranged on an outlet pipeline of the circulating water pump 9 are used for measuring the temperature and pressure parameters of the demineralized water, and controlling and regulating the water supply flow entering the air-water heat exchange device 5 and the supply amount of the demineralized water in the water making workshop.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (3)
1. A system for preparing a denitration urea solution by using flue gas waste heat of a gas-steam combined cycle unit comprises the gas-steam combined cycle unit (1), a waste heat boiler (2) and a chimney (3), wherein the gas-steam combined cycle unit (1), the waste heat boiler (2) and the chimney (3) are communicated in sequence; the device is characterized by further comprising a gas-water heat exchange device (5), a urea dissolving tank (6) and a demineralized water tank (7), wherein the gas-water heat exchange device (5) is arranged on a tail flue between an outlet of the waste heat boiler (2) and a chimney (3), the gas-water heat exchange device (5) is connected with a heat exchange pipeline, the heat exchange pipeline is wound on the outer wall of the urea dissolving tank (6), then the heat exchange pipeline is connected into the demineralized water tank (7), the demineralized water tank (7) is connected into the urea dissolving tank (6) through a demineralized water supply pipeline, a water supply pump (8) is installed on the demineralized water supply pipeline, the demineralized water tank (7) is connected to the gas-water heat exchange device (5) through a circulating water pipeline, and the circulating water pipeline is sequentially connected with a circulating water pump (9), a stop valve (10), an automatic flow regulating device (11) and a temperature and pressure measuring meter (12), and a urea solution temperature and liquid level measuring device (13) is arranged in the urea dissolving tank (6).
2. The system for preparing the denitration urea solution by using the flue gas waste heat of the gas-steam combined cycle unit as set forth in claim 1, wherein the gas-water heat exchange device (5) is arranged in a counter-flow manner, and a pipe material thereof is a stainless steel pipe.
3. The system for preparing the denitration urea solution by using the flue gas waste heat of the gas-steam combined cycle unit as set forth in claim 1, wherein the demineralized water tank (7) is further connected with a demineralized water replenishing pipeline (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120749621.5U CN215311360U (en) | 2021-04-13 | 2021-04-13 | System for preparing denitration urea solution by using flue gas waste heat of gas-steam combined cycle unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120749621.5U CN215311360U (en) | 2021-04-13 | 2021-04-13 | System for preparing denitration urea solution by using flue gas waste heat of gas-steam combined cycle unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215311360U true CN215311360U (en) | 2021-12-28 |
Family
ID=79593621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120749621.5U Active CN215311360U (en) | 2021-04-13 | 2021-04-13 | System for preparing denitration urea solution by using flue gas waste heat of gas-steam combined cycle unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215311360U (en) |
-
2021
- 2021-04-13 CN CN202120749621.5U patent/CN215311360U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113048456A (en) | Energy storage power generation and heat supply system and method for deep peak shaving | |
| CN207713416U (en) | Fire coal boiler fume SCR denitration device urea depth hydrolysis' ammonia system | |
| CN113274855B (en) | System and method for preparing denitration urea solution by using flue gas waste heat of gas-steam combined cycle unit | |
| CN201764487U (en) | Automatic temperature controlling apparatus of low pressure coal economizer | |
| CN205746768U (en) | Combustion natural gas steam high efficiency boiler energy conserving system | |
| CN215311360U (en) | System for preparing denitration urea solution by using flue gas waste heat of gas-steam combined cycle unit | |
| CN204756887U (en) | High -efficient hot media water system of circulating fluidized bed boiler | |
| CN204611733U (en) | The recycling system of boiler afterheat | |
| CN201344553Y (en) | Water-borne type gas heat-exchanging device | |
| CN214891305U (en) | High-temperature fly ash waste heat recovery device | |
| CN202734350U (en) | A heat pump system utilizing a high-temperature waste water source | |
| CN115773492A (en) | Wet nitrogen charging maintenance method for quick start of waste heat boiler of gas turbine | |
| CN101906636B (en) | Method for heating titanium strip rinsing liquid by using microwave heater | |
| CN204922936U (en) | Low pressure economizer connected system | |
| CN208883855U (en) | A kind of biogas project waste heat comprehensive utilization system | |
| CN112268273A (en) | Water medium air heater system and control method | |
| CN108469017B (en) | Comprehensive utilization device and method for back pressure steam turbine of double-drag electric pump | |
| CN202057204U (en) | Waste gas desulfuration and dust control device of carbon calcining furnace | |
| CN202915561U (en) | Condensed type waste-heat utilization device of gas heating system | |
| CN219867926U (en) | Tail gas waste heat recovery energy-saving device of RTO incinerator | |
| CN106989409B (en) | Water-borne flue gas heat exchanger device | |
| CN201293306Y (en) | Steam-water circulating system for energy-conserving operation of steam boiler | |
| CN219756321U (en) | Comprehensive utilization device for waste gas of synthetic ammonia produced by coal | |
| CN216638933U (en) | Flexible heating system for preparing ammonia through urea hydrolysis reaction | |
| CN209026799U (en) | Furnace hot-water heating system in a kind of power plant forced circulation boiler start process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |