CN212157107U - Take heat supply function's once-through boiler to start hydrophobic waste heat utilization equipment - Google Patents
Take heat supply function's once-through boiler to start hydrophobic waste heat utilization equipment Download PDFInfo
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- CN212157107U CN212157107U CN202020402458.0U CN202020402458U CN212157107U CN 212157107 U CN212157107 U CN 212157107U CN 202020402458 U CN202020402458 U CN 202020402458U CN 212157107 U CN212157107 U CN 212157107U
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Abstract
The utility model discloses a once-through boiler starting drainage waste heat utilization device with heat supply function, which comprises a water supply pump, a high temperature heater, a main water supply valve, an economizer, a water wall in the boiler, a water wall outlet distribution header and a separator, wherein the separator is respectively connected with a superheater in the boiler and a water storage tank, the water storage tank is connected with an atmospheric flash tank through a water level control valve, the atmospheric flash tank is provided with an air exhaust pipe and a drain pipe, and the drain pipe is respectively connected with the atmospheric flash tank and a tower pool through an outlet and a valve of the drain pump; a heat supply water return pipeline is connected with the primary drainage cooler, and a pipe valve is arranged on the heat supply water return pipeline; the outlet of the drainage pump is also connected with a heat supply water return pipeline through a branch pipe, and a control valve is arranged on the branch pipe; the utility model discloses but make full use of starts hydrophobic used heat, and the waste heat recovery rate is high, has the advantage that the investment is few, operation zero maintenance and investment return are high.
Description
Technical Field
The utility model relates to a once-through boiler starts hydrophobic waste heat utilization equipment, especially has hydrophobic waste heat utilization equipment of once-through boiler start-up of heat supply function.
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 the above-mentioned not enough of prior art, provide a take direct current boiler of heat supply function to start hydrophobic waste heat utilization equipment, it can make full use of starts hydrophobic used heat, and the waste heat rate of recovery is high, has the advantage that the small investment, operation zero maintenance and investment return are high.
In order to achieve the above object, the utility model discloses a take direct current boiler of heat supply function to start hydrophobic waste heat utilization equipment, including the water-feeding pump that links to each other in proper order, high temperature heating ware, main water-feeding valve, the economizer, the water-cooling wall in the stove, water-cooling wall export distribution header, the separator passes through the steam pipe and links to each other with the over heater in the stove, the separator passes through the water pipe and links to each other with the holding tank, the holding tank passes through pipeline and water level control valve and links to each other with the atmosphere flash tank, the atmosphere flash tank is equipped with to steam drain pipe and drain pipe, the drain pipe links to each other with the import of hydrophobic pump, the export of hydrophobic pump passes through each branch pipe and links to each other with atmosphere flash tank and tower pond respectively, all be equipped with the valve on each branch pipe, its characterized in that still; the outlet of the drainage pump is also connected with a heat supply water return pipeline through a branch pipe, and a control valve is arranged on the branch pipe;
the utility model can lead the drainage generated when the boiler is started to pass through the drainage cooler and heat the working medium introduced into the interior of the drainage cooler, fully recover waste heat, have high recovery rate of the waste heat, and the primary drainage cooler is a heat supply network which is old, thereby having the advantages of less investment and high return on investment, and the system is reliable in operation and zero in maintenance;
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;
as a further improvement of the utility model, an exhaust pipe is arranged on the heat supply water return pipeline, and a valve is arranged on the exhaust pipe; when water is supplied to the pipeline, gas in the pipeline can be discharged;
as a further improvement of the utility model, a water drain pipe and a valve are arranged on a heat supply water return pipeline in front of the primary drainage cooler; when the primary drainage cooler is overhauled, the working medium in a front system can be discharged through a drain pipe;
as a further improvement of the utility model, the water outlet of the primary drainage cooler is connected with the condenser; working medium can be further recycled;
to sum up, the utility model discloses but make full use of starts hydrophobic used heat, and waste heat recovery rate is high, has the advantage that the investment is few, operation zero maintenance and investment return are high.
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 once-through boiler startup drainage waste heat utilization device with a heat supply function of the embodiment includes a water supply pump 1, a high temperature heater 2, a main water supply valve 3, an economizer 4, a water wall 5 in a furnace, a water 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 flash tank 11 through a pipeline and a water level control valve 10, the atmospheric flash tank 11 is provided with an air exhaust pipe 12 and a drain pipe, the drain pipe is connected with an inlet of a drainage pump 13, an outlet of the drainage pump 13 is respectively connected with the atmospheric flash tank 11 and a tower 15 through branch pipes, and valves are arranged on the branch pipes; a heat supply water return pipe 16 is connected with a primary drainage cooler 17, a pipe valve 18 and an exhaust pipe 19 are arranged on the heat supply water return pipe 16, and a valve 20 is arranged on the exhaust pipe 19; the outlet of the drainage pump 13 is also connected with the heat supply water return pipe 16 through a branch pipe, and an electric shutoff valve 21 and a manual shutoff valve 22 which are connected in series are arranged on the branch pipe; a water discharge pipe 23 and a valve 24 are arranged on the heat supply water return pipeline 16 in front of the primary hydrophobic cooler 17, and a water outlet of the primary hydrophobic cooler 17 is connected with a condenser 26;
the utility model discloses can pass through first grade hydrophobic cooler 17 with the hydrophobic work medium (such as the condensate water, return to the water supply system of boiler again, also can be other hot water supply) that produces in the boiler start-up earlier, fully retrieve used heat, and the waste heat rate of recovery is high, and first grade hydrophobic cooler 17 is the advantage of good interest in the heat supply network in addition, has the advantage that the investment is few, the return on investment is high, the system operation is reliable, zero maintenance; when the remote operation electric shutoff valve 21 is abnormal, the manual shutoff valve 22 can realize normal on-site opening and closing of the pipeline, so that the reliability is improved;
when the heat supply water return pipeline 16 is supplied with water, the valve 20 is opened to discharge the gas in the pipeline; when the primary drainage cooler 17 is overhauled, working media in a front system can be discharged through the drainage pipe 23 and the valve 24; the condenser 26 can further recover the working fluid.
Claims (5)
1. A direct current boiler starting drainage waste heat utilization device with a heat supply function 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 sequentially connected, 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 expansion tank through a pipeline and a water level control valve, the atmospheric expansion 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 expansion tank and a tower pool through branch pipes, each branch pipe is provided with a valve, and the direct current boiler starting drainage waste heat utilization device is characterized by further comprising a heat supply water return pipeline and a primary drainage cooler; the outlet of the drainage pump is also connected with a heat supply water return pipeline through a branch pipe, and a control valve is arranged on the branch pipe.
2. The once-through boiler starting drainage waste heat utilization device with the heat supply function as claimed in claim 1, is characterized in that: the control valve comprises an electric shutoff valve and a manual shutoff valve which are connected in series.
3. The once-through boiler starting water draining waste heat utilization device with the heat supply function as claimed in claim 1 or 2, is characterized in that: an exhaust pipe is arranged on the heat supply water return pipeline, and a valve is arranged on the exhaust pipe.
4. The once-through boiler starting drainage waste heat utilization device with the heating function according to claim 3, is characterized in that: and a water drain pipe and a valve are arranged on a heat supply water return pipeline in front of the primary drainage cooler.
5. The once-through boiler starting drainage waste heat utilization device with the heat supply function as claimed in claim 4, wherein: the water outlet of the first-stage hydrophobic cooler is connected with the condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020402458.0U CN212157107U (en) | 2020-03-26 | 2020-03-26 | Take heat supply function's once-through boiler to start hydrophobic waste heat utilization equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020402458.0U CN212157107U (en) | 2020-03-26 | 2020-03-26 | Take heat supply function's once-through boiler to start hydrophobic waste heat utilization equipment |
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| CN212157107U true CN212157107U (en) | 2020-12-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754350A (en) * | 2022-03-08 | 2022-07-15 | 华北电力科学研究院有限责任公司 | Heat recovery system, method and device |
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2020
- 2020-03-26 CN CN202020402458.0U patent/CN212157107U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754350A (en) * | 2022-03-08 | 2022-07-15 | 华北电力科学研究院有限责任公司 | Heat recovery system, method and device |
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