CN217131232U - Novel reheater dry-heating-preventing steam cooling system and dry-heating-preventing steam system - Google Patents
Novel reheater dry-heating-preventing steam cooling system and dry-heating-preventing steam system Download PDFInfo
- Publication number
- CN217131232U CN217131232U CN202220293790.7U CN202220293790U CN217131232U CN 217131232 U CN217131232 U CN 217131232U CN 202220293790 U CN202220293790 U CN 202220293790U CN 217131232 U CN217131232 U CN 217131232U
- Authority
- CN
- China
- Prior art keywords
- steam
- pressure
- superheater
- reheater
- economizer
- 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 discloses a novel reheater dry burning prevention steam cooling system, which comprises a high pressure steam flowmeter for measuring the steam flow entering a high pressure primary superheater from a steam pocket, and an adjusting device for adjusting the steam flow entering a cold re-flowmeter from the high pressure primary superheater; the high-pressure steam flowmeter is arranged between the steam drum and the high-pressure primary superheater; the adjusting device comprises an adjusting valve and a cooling pipeline, the high-pressure first-stage superheater and the cold re-flowmeter are communicated through the cooling pipeline, and the adjusting valve is arranged in the cooling pipeline. The utility model greatly reduces the temperature requirements of pipelines and valves of the reheater dry-burning-resistant steam cooling system, and the steam can directly enter the cold-reheat steam system, thus omitting the desuperheating water system of the original scheme; the utility model discloses only need dispose high-pressure steam flowmeter, cold flowmeter again at steam pocket export and re-heater inlet side, through the flow distribution of governing valve regulation and control re-heater and over heater, can solve over heater, re-heater and receive the synchronous cooling problem of hot side, avoid the emergence of dry combustion method phenomenon.
Description
Technical Field
The utility model relates to a reheater prevents dry combustion method technical field, especially relates to a novel reheater prevent dry combustion method steam cooling system and prevent dry combustion method steam system.
Background
With the continuous improvement of national waste heat utilization parameters, industrial waste heat boilers have more units with reheating operation. Compared with the conventional boiler, the temperature of the flue gas entering the boiler by partial waste heat power generation projects is not increased, and the flue gas with the temperature of over 1000 ℃ directly enters the waste heat boiler, which puts a very strict requirement on the dry burning prevention capability of the heating surface of the waste heat boiler. For example, when an inlet flue gas gate is gradually opened in a heat recovery waste heat boiler in the coking industry, flue gas at 1100 ℃ directly enters the waste heat boiler.
At present, for a heating surface of a superheater, steam can be quickly generated in a heating surface pipe through a furnace heating mode, and for a heating surface of a reheater, after the superheated steam is required to stably generate the steam, the steam enters a cold recycling system through a steam bypass measured by a steam turbine, in order to solve the problem, a set of dry-burning-preventing steam bypass system is arranged outside a boiler side, as shown in fig. 1, although the dry-burning problem of the reheater is solved by the existing scheme, the scheme still has the following two disadvantages:
1. cooling steam is taken from a high-pressure system, and the steam pressure temperature is high, so that the design temperature and pressure of a bypass system pipeline and a valve are high;
2. the temperature and pressure of the cooling steam are too high to directly enter a cold recycling system, and a pressure reducing valve and a temperature reducing water system are required to be configured.
Disclosure of Invention
Based on the technical problem that the background art exists, the utility model provides a novel re-heater prevent dry combustion method steam cooling system and prevent dry combustion method steam system.
A novel reheater dry-burning-resistant steam cooling system comprises a high-pressure steam flowmeter for measuring the flow of steam entering a high-pressure primary superheater from a steam drum, and an adjusting device for adjusting the flow of steam entering a cold re-flowmeter from the high-pressure primary superheater;
the high-pressure steam flowmeter is arranged between the steam drum and the high-pressure primary superheater; the adjusting device comprises an adjusting valve and a cooling pipeline, the high-pressure first-stage superheater and the cold re-flowmeter are communicated through the cooling pipeline, and the adjusting valve is arranged in the cooling pipeline.
Preferably, the cooling system further comprises a shut-off valve, and the shut-off valve and the regulating valve are arranged in the cooling pipeline in a staggered mode.
A dry-heating prevention steam system comprises the novel reheater dry-heating prevention steam cooling system, a flue gas inlet and outlet device, a high-pressure steam system and a cold re-steam system;
the smoke inlet and outlet device comprises a body communicated with the smoke inlet and the smoke outlet;
the cold re-steam system comprises a cold re-flowmeter and a reheater communicated with the cold re-flowmeter, and the reheater is positioned in the flue gas inlet and outlet device body;
the high-pressure steam system comprises a high-pressure secondary superheater, a high-pressure primary superheater, a steam drum, an evaporator and an economizer which are sequentially communicated; the high-pressure secondary superheater, the high-pressure primary superheater, the evaporator and the economizer are positioned in the flue gas inlet and outlet device body and are sequentially arranged along the flow direction of flue gas, and the reheater is positioned at the upstream of the high-pressure primary superheater along the flow direction of flue gas.
Preferably, the superheater further comprises a high-pressure tertiary superheater, and an outlet of the high-pressure secondary superheater is communicated with an inlet of the high-pressure tertiary superheater.
Preferably, the reheater includes low temperature reheater, high temperature reheater, and the high temperature reheater is close to the flue gas inlet and sets up, and cold flow meter is in proper order with low temperature reheater, high temperature reheater UNICOM.
Preferably, the high-pressure tertiary superheater, the high-temperature reheater, the high-pressure secondary superheater, the low-temperature reheater and the high-pressure primary superheater are located in the flue gas inlet and outlet device body and are arranged in sequence along the flow direction of flue gas.
Preferably, the economizer comprises a first-stage economizer, a second-stage economizer and a third-stage economizer which are connected in sequence; the tertiary economizer, the secondary economizer and the primary economizer are sequentially arranged along the flowing direction of the flue gas.
Preferably, the flue gas inlet and outlet device is of an inverted U-shaped structure, the high-pressure tertiary superheater, the high-temperature reheater, the high-pressure secondary superheater, the low-temperature reheater and the high-pressure primary superheater are sequentially arranged at the flue gas ascending section, and the evaporator, the tertiary economizer, the secondary economizer and the primary economizer are sequentially arranged at the flue gas descending section.
The technical effects of the utility model are as follows:
(1) the utility model discloses set up a high-pressure steam flowmeter between steam pocket and high-pressure one-level over heater, through adjusting device's governing valve, the control gets into the steam flow of cold re-flowmeter, can realize preheating over heater and re-heater heating surface, avoids dry combustion method, simple structure, safe and reliable to exhaust-heat boiler's heating surface.
(2) The utility model discloses can realize the over heater, the synchronous cooling of re-heater heating surface, the steam of taking from the export of high-pressure one-level over heater, the temperature is lower, prevent dry combustion method steam cooling system pipeline to the re-heater, the temperature requirement of valve reduces by a wide margin, and the cooling steam does not need the desuperheating just can directly get into cold steam system again, the desuperheating water system of former scheme has been saved, the steam of taking from the export of high-pressure one-level over heater simultaneously, after the heating, steam has certain superheat degree, when consequently the re-heater system is removed in the decompression, effectively prevent the possibility of steam decompression area water.
The utility model discloses can solve the bypass system that the too high bypass system design temperature that exists of prior art arouses complicated, design parameter is too high, and the problem that the cost is higher provides a simple structure, safe and reliable's a novel dry combustion method steam cooling system is prevented to the re-heater, through the flow distribution through governing valve regulation and control re-heater and over heater, effectively avoids the emergence of dry combustion method phenomenon.
Drawings
Fig. 1 is a schematic flow diagram of an anti-dry heating steam bypass system and a steam system in the prior art.
Fig. 2 is a schematic flow diagram of a novel dry-heating prevention steam cooling system and a steam system for a reheater according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described in detail by the following embodiments.
Examples
As shown in the dotted line range of fig. 2, a novel reheater dry-heating prevention steam cooling system comprises a high-pressure steam flowmeter for measuring the flow of steam entering a high-pressure primary superheater from a steam drum, and a regulating device for regulating the flow of steam entering a cold re-flowmeter from the high-pressure primary superheater; the high-pressure steam flowmeter is arranged between the steam drum and the high-pressure primary superheater; the adjusting device comprises an adjusting valve and a cooling pipeline, the high-pressure first-stage superheater and the cold re-flowmeter are communicated through the cooling pipeline, and the adjusting valve is arranged in the cooling pipeline.
Specifically, the cooling system further comprises a shut-off valve, and the shut-off valve is arranged in the cooling pipeline.
As shown in fig. 2, a dry-heating prevention steam system includes: the novel reheater dry-burning-prevention steam cooling system, the flue gas inlet and outlet device, the high-pressure steam system and the cold-re-steam system.
The smoke inlet and outlet device comprises a body communicated with the smoke inlet and the smoke outlet; the high-pressure steam system comprises a high-pressure tertiary superheater, a high-pressure secondary superheater, a high-pressure primary superheater, a steam pocket, an evaporator and an economizer which are sequentially communicated; the coal economizer comprises a first-stage coal economizer, a second-stage coal economizer and a third-stage coal economizer which are sequentially communicated; the third-stage economizer, the second-stage economizer and the first-stage economizer are sequentially arranged along the inlet and outlet direction of the flue gas; the cold rebeaming system comprises a cold rebeaming flowmeter and a reheater communicated with the cold rebeaming flowmeter; the reheater includes low-temperature reheater and high-temperature reheater.
The high-pressure tertiary superheater, the high-temperature reheater, the high-pressure secondary superheater, the low-temperature reheater, the high-pressure primary superheater, the evaporator and the economizer are all located in the flue gas inlet and outlet device body and are arranged in sequence along the flow direction of flue gas.
Specifically, the flue gas inlet and outlet device is of an inverted U-shaped structure, the high-pressure tertiary superheater, the high-temperature reheater, the high-pressure secondary superheater, the low-temperature reheater and the high-pressure primary superheater are sequentially arranged at a flue gas ascending section, and the evaporator, the tertiary economizer, the secondary economizer and the primary economizer are sequentially arranged at a flue gas descending section.
The operation method of the dry-heating prevention steam system specifically comprises the following steps:
s1, when the unit is started to operate, high-temperature flue gas enters a heated surface from a flue gas inlet, saturated steam is rapidly generated by a preheated steam drum, the saturated steam enters a high-pressure primary superheater after passing through a high-pressure steam flow meter, the steam passing through the high-pressure primary superheater is divided into two paths, and one path of steam sequentially enters a high-pressure secondary superheater and a high-pressure tertiary superheater and is used for cooling the superheaters; the other path of steam sequentially enters a cold re-flowmeter, a low-temperature reheater and a high-temperature reheater through a regulating valve in a cooling pipeline and is used for cooling the reheater;
controlling the flow of the cold re-flow meter to be 10-80% of the flow of the high-pressure steam flow meter by adjusting the adjusting valve, and specifically 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%;
the steam in the high-pressure primary superheater is divided into two paths, one path of the steam enters a cooling pipeline and is communicated with a cold re-flow meter on a cold re-steam system after passing through a shut-off valve and a regulating valve, and because the cooling steam is taken from the outlet of the high-pressure primary superheater, the steam temperature is about 370 ℃, compared with the steam temperature of about 540 ℃ of a final-stage high-pressure main steam outlet in the prior scheme, the temperature requirements on pipelines and valves of a reheater anti-dry-burning steam cooling system are greatly reduced, and the cooling steam can directly enter the cold re-steam system without temperature reduction, so that a temperature reduction water system in the prior scheme is omitted;
the utility model discloses can solve the synchronous cooling problem of over heater, re-heater heating surface, only need dispose high-pressure steam flowmeter, cold flowmeter again in steam pocket export and re-heater inlet side, through the flow distribution of governing valve regulation and control re-heater and over heater, avoid the emergence of dry combustion method phenomenon.
S2, when the unit is started and reaches 10-30% load, specifically 10%, 15%, 20%, 25 and 30%, closing a shutoff valve of the novel reheater dry-burning-resistant steam cooling system, enabling water entering from a water supply inlet to enter a primary economizer, a secondary economizer, a tertiary economizer, an evaporator and a steam pocket in sequence, enabling saturated steam generated by the steam pocket to enter a high-pressure primary superheater after passing through a high-pressure steam flowmeter, enabling all steam passing through the high-pressure primary superheater to enter the high-pressure secondary superheater and the high-pressure tertiary superheater in sequence, and enabling generated high-pressure main steam to enter a steam utilization mechanism; the cold re-steam generated from the steam utilization mechanism sequentially passes through the cold re-flowmeter, the low-temperature reheater and the high-temperature reheater, and the generated hot re-steam enters the steam utilization mechanism.
In the use process, the flow of the cold re-flow meter is controlled to be 50% of that of the high-pressure steam flow meter through the regulating valve, cooling steam is ensured to be arranged on the heating surfaces of the cold re-flow system and the high-pressure steam system, and dry burning of the heating surfaces is effectively prevented.
Specifically, in S2, when the load reaches 25% after the unit is started, the shut-off valve is closed, and the turbine bypass system has been stably operated, so that sufficient cold reheat steam can be provided.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (8)
1. A novel reheater dry-burning-resistant steam cooling system is characterized by comprising a high-pressure steam flowmeter for measuring the flow of steam entering a high-pressure primary superheater from a steam drum and a regulating device for regulating the flow of the steam entering a cold re-flowmeter from the high-pressure primary superheater;
the high-pressure steam flowmeter is arranged between the steam drum and the high-pressure primary superheater; the adjusting device comprises an adjusting valve and a cooling pipeline, the high-pressure first-stage superheater and the cold re-flowmeter are communicated through the cooling pipeline, and the adjusting valve is arranged in the cooling pipeline.
2. The system of claim 1, further comprising a shut-off valve disposed in the cooling conduit.
3. A dry-fire prevention steam system, comprising the new reheater dry-fire prevention steam cooling system of claim 1 or 2, a flue gas inlet and outlet device, a high pressure steam system, and a cold re-steam system;
the smoke inlet and outlet device comprises a body communicated with the smoke inlet and the smoke outlet;
the cold re-steam system comprises a cold re-flowmeter and a reheater communicated with the cold re-flowmeter, and the reheater is positioned in the flue gas inlet and outlet device body;
the high-pressure steam system comprises a high-pressure secondary superheater, a high-pressure primary superheater, a steam drum, an evaporator and an economizer which are sequentially communicated; the high-pressure secondary superheater, the high-pressure primary superheater, the evaporator and the economizer are positioned in the flue gas inlet and outlet device body and are sequentially arranged along the flow direction of the flue gas; along the flowing direction of the flue gas, the reheater is positioned at the upstream of the high-pressure primary superheater.
4. The dry combustion preventing steam system of claim 3, wherein the superheater further comprises a high pressure tertiary superheater, an outlet of the high pressure secondary superheater being in communication with an inlet of the high pressure tertiary superheater.
5. The dry-fire prevention steam system of claim 4, wherein the reheater comprises a low temperature reheater and a high temperature reheater, the high temperature reheater being disposed adjacent to the flue gas inlet, the cold-reheat flow meter being in communication with the low temperature reheater and the high temperature reheater in sequence.
6. The dry combustion preventing steam system as set forth in claim 5, wherein the high pressure tertiary superheater, the high temperature reheater, the high pressure secondary superheater, the low temperature reheater and the high pressure primary superheater are disposed in the flue gas inlet and outlet device body in sequence along the flow direction of the flue gas.
7. The dry-fire prevention steam system according to claim 6, wherein the economizer comprises a primary economizer, a secondary economizer, and a tertiary economizer connected in sequence; the tertiary economizer, the secondary economizer and the primary economizer are sequentially arranged along the flowing direction of the flue gas.
8. The dry combustion preventing steam system according to claim 7, wherein the flue gas inlet and outlet device is of an inverted U-shaped structure, the high-pressure tertiary superheater, the high-temperature reheater, the high-pressure secondary superheater, the low-temperature reheater and the high-pressure primary superheater are sequentially arranged at the flue gas ascending section, and the evaporator, the tertiary economizer, the secondary economizer and the primary economizer are sequentially arranged at the flue gas descending section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220293790.7U CN217131232U (en) | 2022-02-14 | 2022-02-14 | Novel reheater dry-heating-preventing steam cooling system and dry-heating-preventing steam system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220293790.7U CN217131232U (en) | 2022-02-14 | 2022-02-14 | Novel reheater dry-heating-preventing steam cooling system and dry-heating-preventing steam system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217131232U true CN217131232U (en) | 2022-08-05 |
Family
ID=82622246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220293790.7U Active CN217131232U (en) | 2022-02-14 | 2022-02-14 | Novel reheater dry-heating-preventing steam cooling system and dry-heating-preventing steam system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217131232U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526474A (en) * | 2022-02-14 | 2022-05-24 | 东方菱日锅炉有限公司 | Dry burning prevention steam cooling system for reheater and dry burning prevention method thereof |
-
2022
- 2022-02-14 CN CN202220293790.7U patent/CN217131232U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526474A (en) * | 2022-02-14 | 2022-05-24 | 东方菱日锅炉有限公司 | Dry burning prevention steam cooling system for reheater and dry burning prevention method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH01107003A (en) | Method of operating once-through type boiler | |
| CN108458357A (en) | A kind of realization opens machine denitration and puts into operation system and method | |
| CN112594667A (en) | System and method for adjusting reheat steam temperature of high-temperature ultrahigh-pressure reheat dry quenching boiler | |
| CN217131232U (en) | Novel reheater dry-heating-preventing steam cooling system and dry-heating-preventing steam system | |
| US9151185B2 (en) | Steam power plant with steam turbine extraction control | |
| CN201218519Y (en) | Reheating temperature-reduction auxiliary regulating mechanism for coal-gas mixed combustion boiler | |
| JP3230530U (en) | High temperature heat receiving surface Metal wall temperature control system | |
| CN114526474A (en) | Dry burning prevention steam cooling system for reheater and dry burning prevention method thereof | |
| CN112197252A (en) | Main steam heating system with steam supply bypass | |
| CN213834530U (en) | Conversion device for water gas conversion reaction | |
| CN211424362U (en) | Deaerator preheating system capable of improving steam output supplied from back pressure unit | |
| CN208431794U (en) | A kind of realization opens machine denitration and puts into operation system | |
| CN209470194U (en) | A kind of coal gas electricity generation boiler water supply system | |
| CN207080980U (en) | A kind of large-scale steam-water dual-purpose type boiler | |
| CN114151778B (en) | Boiler structure without stopping furnace during overhaul and furnace stopping switching method | |
| CN217441592U (en) | Ultrahigh-temperature, ultrahigh-pressure and dry quenching waste heat power generation steam pressure adjusting system | |
| CN214580977U (en) | High-temperature ultrahigh-pressure reheating dry quenching boiler reheat steam temperature adjusting system | |
| CN114576605B (en) | System and method for realizing deep peak shaving by heating water supply through reheat steam | |
| CN107327827A (en) | A kind of large-scale steam-water dual-purpose type boiler | |
| CN217978755U (en) | Gas supply system of supercritical gas boiler | |
| CN215259851U (en) | Water supply pipeline system matched with waste incineration waste heat boiler | |
| CN217899822U (en) | Steam control system of waste heat boiler | |
| CN214536287U (en) | Primary air heating system of waste incineration power station | |
| CN214115605U (en) | Steam conditioning system for converter waste heat recovery | |
| CN217978756U (en) | Supercritical gas boiler and gas supply pipeline thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |