CN212157106U - Drainage waste heat utilization equipment is started to once-through boiler - Google Patents
Drainage waste heat utilization equipment is started to once-through boiler Download PDFInfo
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- CN212157106U CN212157106U CN202020402456.1U CN202020402456U CN212157106U CN 212157106 U CN212157106 U CN 212157106U CN 202020402456 U CN202020402456 U CN 202020402456U CN 212157106 U CN212157106 U CN 212157106U
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Abstract
The utility model discloses a drainage afterheat utilization device for the start of a once-through boiler, which comprises a water feeding pump, a high temperature heater, a main water feeding valve, an economizer, a water cooling wall in a furnace, a water cooling wall outlet distribution header and a separator, wherein the separator is respectively connected with a superheater in the furnace and a water storage tank, the water storage tank is connected with an atmospheric flash tank, the atmospheric flash tank is provided with an air exhaust pipe and a drain pipe, the drain pipe is respectively connected with the atmospheric flash tank, a condenser and a tower tank through the drain pump and a valve, the drain pump is connected with a water-air heater through a branch pipe, a water outlet of the water-air heater is connected with the tower tank, an air outlet of the water-air heater is connected with an air inlet of the steam heater, and an air outlet of the steam heater is connected with an air inlet of a coal mill; the utility model discloses but make full use of starts hydrophobic used heat, and waste heat recovery rate is high, improves boiler flue gas temperature level, improves the boiler and starts the initial stage and surely fires the condition, improves SCR entry flue gas temperature in step, realizes the low-load denitration.
Description
Technical Field
The utility model relates to a concurrent boiler starts hydrophobic waste heat utilization equipment, especially is used for super supercritical, super supercritical concurrent boiler to start hydrophobic waste heat utilization equipment.
Background
At present, the starting systems of supercritical and ultra-supercritical boilers have two types: atmospheric expansion (without BCP circulating pump) and forced circulation (with BCP pump). An atmospheric expansion type starting system is shown in figure 1 and comprises a water feeding pump 1, a high-temperature heater 2, a main water feeding valve 3, an economizer 4, a water cooling wall 5 in a furnace, a water cooling wall outlet distribution header 6 and a separator 7 which are connected in sequence, wherein the separator 7 is connected with a superheater 8 in the furnace through a steam pipe, the separator 7 is connected with a water storage tank 9 through a water pipe, the water storage tank 9 is connected with an atmospheric expansion tank 11 through a pipeline and a water level control valve 10, the atmospheric expansion tank 11 is provided with an air exhaust pipe 12 and a drain pipe, the drain pipe is connected with an inlet of a drain pump 13, an outlet of the drain pump 13 is respectively connected with the atmospheric expansion tank 11, a condenser 14 and a tower pool 15 through branch pipes, and valves are arranged on the branch pipes; during the starting stage or low-load operation (before dry-wet state conversion) of the boiler unit, the starting system recovers most of flowing working media (the flow accounting for about 25% of the BMCR working condition) through the condenser 14, the heat contained in the working media is basically completely wasted, and the advantages and the disadvantages are as follows:
1. the advantages are that: the system is simple and reliable, the investment is low, and basically no maintenance is needed;
2. the disadvantages are as follows: the heat loss is large, and the heat carried by the working medium flowing through the starting system is completely lost before the dry-wet state of the boiler is converted;
secondly, for the start-up system of taking the BCP pump, at boiler unit start-up or low-load operation stage (before dry and wet attitude conversion), the start-up system sends the working medium that flows through into boiler water supply system again through the BCP pump, carries out heat and working medium and retrieves, and its advantage and disadvantage is:
1. the advantages are that: before the dry-wet state conversion of the boiler, the working medium and the heat of the starting system can be completely recovered, and the heat efficiency is high;
2. the disadvantages are as follows: the BCP circulating pump system has a severe working environment (for a supercritical unit, the working pressure is about 35MPa, the working temperature is 375 ℃), the BCP circulating pump system needs to be provided with a complex circulating cooling water system and a corresponding pipeline valve system, so that the whole system is complex in arrangement and large in investment (the purchase cost of a single BCP exceeds 500 ten thousand, the investment of the whole system exceeds 1100 ten thousand per furnace after the pipeline and the valve are arranged and supported in a hanging way), and then the operation and maintenance cost is high, particularly for a peak shaving unit, the BCP circulating pump system frequently enters dry-wet state conversion, and the BCP circulating pump often has motor burnout caused by overhigh motor temperature, so that the condition of furnace shutdown and maintenance is caused; thirdly, the BCP pump has high power consumption.
Disclosure of Invention
The utility model aims at prior art's the aforesaid is not enough, provides a once-through boiler starts hydrophobic waste heat utilization equipment, and it can make full use of starts hydrophobic used heat, and the waste heat rate of recovery is high, reduces to use and faces stove heating steam, improves boiler smoke temperature level, improves the boiler and starts the initial stage and surely fires the condition, improves SCR entry smoke temperature in step, realizes the low-load denitration.
In order to achieve the above object, the utility model discloses a once-through boiler start-up drainage waste heat utilization device, which comprises a water supply pump, a high temperature heater, a main water supply valve, an economizer, a water cooling wall in a furnace, a water cooling wall outlet distribution header and a separator which are connected in sequence, wherein the separator is connected with a superheater in the furnace through a steam pipe, the separator is connected with a water storage tank through a water pipe, the water storage tank is connected with an atmospheric flash tank through a pipeline and a water level control valve, the atmospheric flash tank is provided with an air exhaust pipe and a drain pipe, the drain pipe is connected with an inlet of a drainage pump, an outlet of the drainage pump is respectively connected with the atmospheric flash tank, a condenser and a tower pool through branch pipes, each branch pipe is provided with a valve, the device is characterized in that the outlet of the drainage pump is also connected with a water-air heater through a branch pipe, the branch pipe is provided with a control valve, a, the air outlet of the water-air heater is connected with the air inlet of the steam air heater, and the air outlet of the steam air heater is connected with the air inlet of the coal mill;
the utility model has the advantages that the drainage pipeline is connected in parallel behind the drainage pump, when the drainage condition meets the requirement, the water-air heater is used for heating the inlet primary air of the coal mill, and as the drainage is started to be the variable working condition flow, the stable primary air temperature can be maintained by adjusting the furnace-facing auxiliary steam amount of the steam air heater; the device heats primary cold air of the coal mill by using the waste heat of the starting drain, can improve the smoke temperature level of the boiler, improve the stable combustion condition at the initial stage of the starting of the boiler, synchronously improve the smoke temperature of the SCR inlet, realize the input denitration during the steam engine warming, assist the steam consumption during the starting of the extrusion unit and have high investment return;
as a further improvement of the present invention, the control valve comprises an electric shutoff valve and a manual shutoff valve connected in series; when the electric shutoff valve is abnormal, the pipeline can be normally opened and closed through the manual shutoff valve, so that the reliability is improved;
to sum up, the utility model discloses but make full use of starts hydrophobic used heat, waste heat recovery rate is high, reduces to use and faces stove heating steam, improves boiler gas temperature level, improves the boiler and starts the initial stage and surely fires the condition, improves SCR entry gas temperature in step, realizes the low-load denitration.
Drawings
Fig. 1 is a schematic structural diagram of a conventional atmospheric expansion starting system.
Fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in FIG. 2, the waste heat utilization device for the start-up drainage of the once-through boiler of the embodiment comprises a water feed pump 1, a high temperature heater 2, a main water feed valve 3, an economizer 4, a water cooling wall 5 in the boiler, a water cooling wall outlet distribution header 6 and a separator 7 which are connected in sequence, wherein the separator 7 is connected with a superheater 8 in the boiler through a steam pipe, the separator 7 is connected with a water storage tank 9 through a water pipe, the water storage tank 9 is connected with an atmospheric water tank 11 through a pipeline and a flash tank water level control valve 10, the atmospheric water tank 11 is provided with an air exhaust pipe 12 and a drain pipe, the drain pipe is connected with an inlet of a drain pump 13, an outlet of the drain pump 13 is respectively connected with the atmospheric water tank 11, a condenser 14 and a tower 15 through branch pipes, valves are arranged on the branch pipes, an outlet of the drain pump 13 is further connected with a water-air heater 16 through a branch pipe, an electric shutoff valve 17 and a manual shutoff valve 18 which are connected in series are arranged, the water outlet of the water-air heater 16 is connected with the tower pool 15, the air outlet of the water-air heater 16 is connected with the air inlet of the steam air heater 19, and the air outlet of the steam air heater 19 is connected with the air inlet of the coal mill 20;
when the system is started, the in-furnace superheater 8 is connected with a steam turbine, primary cold air of a coal mill is introduced into an air inlet of a water-air heater 16, and auxiliary steam close to the furnace is introduced into a steam air heater 19; when the working medium and the heat in the system are started, when the drainage condition meets the requirement, the electric shutoff valve 17 and the manual shutoff valve 18 are opened, primary cold air of the coal mill is heated through the water-air heater 16, and as the drainage is started, the variable working condition flow is adopted, the stable primary air temperature can be maintained by adjusting the furnace-facing auxiliary steam quantity of the steam air heater 19; the device heats primary cold air of the coal mill by using the waste heat of the starting drain, can improve the smoke temperature level of the boiler, improve the stable combustion condition at the initial stage of the starting of the boiler, synchronously improve the smoke temperature of the SCR inlet, realize the input denitration during the steam engine warming, assist the steam consumption during the starting of the extrusion unit and have high investment return; when the electric shutoff valve 17 is abnormal, the manual shutoff valve 18 can realize normal opening and closing of the pipeline, and reliability is improved.
Claims (2)
1. A waste heat utilization device for starting drainage of a once-through boiler comprises a water feeding pump, a high-temperature heater, a main water feeding valve, an economizer, a water cooling wall in a boiler, a water cooling wall outlet distribution header and a separator which are sequentially connected, wherein the separator is connected with a superheater in the boiler through a steam pipe, the separator is connected with a water storage tank through a water pipe, the water storage tank is connected with an atmospheric flash tank through a pipeline and a water level control valve, the atmospheric flash tank is provided with an air exhaust pipe and a drain pipe, the drain pipe is connected with an inlet of a drainage pump, an outlet of the drainage pump is respectively connected with the atmospheric flash tank, a condenser and a tower pool through branch pipes, each branch pipe is provided with a valve, the outlet of the drainage pump is also connected with a water-air heater through a branch pipe, the branch pipe is provided with a control valve, a water outlet of the water-air heater is connected with the tower pool, an air outlet of the water-air heater is connected, the air outlet of the steam air heater is connected with the air inlet of the coal mill.
2. The once-through boiler start-up water draining waste heat utilization device of claim 1, wherein: the control valve comprises an electric shutoff valve and a manual shutoff valve which are connected in series.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020402456.1U CN212157106U (en) | 2020-03-26 | 2020-03-26 | Drainage waste heat utilization equipment is started to once-through boiler |
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| CN202020402456.1U CN212157106U (en) | 2020-03-26 | 2020-03-26 | Drainage waste heat utilization equipment is started to once-through boiler |
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| CN212157106U true CN212157106U (en) | 2020-12-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113446584A (en) * | 2021-06-24 | 2021-09-28 | 华能秦煤瑞金发电有限责任公司 | Power plant boiler water circulation system |
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2020
- 2020-03-26 CN CN202020402456.1U patent/CN212157106U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113446584A (en) * | 2021-06-24 | 2021-09-28 | 华能秦煤瑞金发电有限责任公司 | Power plant boiler water circulation system |
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