CN212537810U - Low-pressure superheater system of waste heat boiler - Google Patents
Low-pressure superheater system of waste heat boiler Download PDFInfo
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- CN212537810U CN212537810U CN202022041682.4U CN202022041682U CN212537810U CN 212537810 U CN212537810 U CN 212537810U CN 202022041682 U CN202022041682 U CN 202022041682U CN 212537810 U CN212537810 U CN 212537810U
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Abstract
The utility model relates to a waste heat boiler's low pressure over heater system. The utility model discloses a setting comes to the one-level low pressure over heater that lies in high-pressure economizer low reaches for the flue gas, sets up the second grade low pressure over heater between high-pressure economizer heating surface level, and one-level low pressure over heater entry is connected with the low pressure steam pocket through the low pressure saturated steam pipeline and exports and be connected with the steam turbine through the export pipeline, and second grade low pressure over heater exports and is connected with external heating equipment through the heat supply pipeline and the entry is connected with the export pipeline through level connecting line. The utility model discloses a carry out hierarchical setting and control to the low pressure over heater heating surface, can provide the steam of different parameters respectively to steam turbine and heating equipment, satisfy the electricity generation of unit simultaneously and heat supply to the demand of steam, improved the economic nature and the flexibility of unit.
Description
Technical Field
The utility model relates to a waste heat boiler's low pressure system especially relates to a waste heat boiler's low pressure over heater system, belongs to power plant boiler equipment technical field.
Background
With the continuous change of the heat supply demand of the power plant, especially the continuous increase of the heat supply demand of steam, the heat supply demand cannot be met by steam exhaust of a steam turbine, and the main steam of a low-pressure system needs to be supplemented. Because the requirements of power generation and heat supply on steam parameters are different, once the heating surface of the existing low-pressure system of the waste heat boiler is determined, the steam parameters output by the low-pressure superheater can only be selected between meeting the requirements of power generation or meeting the requirements of heat supply, that is, superheated steam generated by the low-pressure system cannot be simultaneously used for power generation and heat supply, so that when a power plant project with continuously increased heat supply requirements is carried out on a unit surface, certain limitation is imposed on meeting the requirements of power generation and heat supply on steam, and the economy and flexibility of the unit are poor. Therefore, how to simultaneously meet different requirements of steam turbine and heating equipment on steam parameters becomes a difficult problem to be solved urgently in design of the heating surface of the low-pressure system.
Disclosure of Invention
The utility model discloses mainly solve the technical defect that the superheated steam of the low pressure system output that prior art exists can't satisfy the electricity generation of unit and the heat supply requirement simultaneously, provide a superheated steam can satisfy the electricity generation of unit and the low pressure over heater system that the heat supply required simultaneously.
The utility model discloses to above-mentioned technical problem mainly can solve through following technical scheme: the utility model discloses a setting is coming to the one-level low pressure over heater that lies in high-pressure economizer low reaches for the flue gas, sets up the second grade low pressure over heater between high-pressure economizer heating surface level, and one-level low pressure over heater's entry is connected with the low pressure steam pocket through the low pressure saturated steam pipeline and exports to be connected with the steam turbine through the export pipeline, and second grade low pressure over heater's export is connected with outside heating equipment through the heat supply pipeline and the entry is connected with the export pipeline through level connecting line.
Preferably, a control valve is provided on the interstage connection line.
Preferably, a desuperheater is arranged on the interstage connecting pipeline and is arranged between the inlet of the secondary low-pressure superheater and the control valve.
Therefore, the utility model discloses rational in infrastructure has following advantage:
the utility model discloses in, low pressure over heater includes one-level low pressure over heater and second grade low pressure over heater. The primary low-pressure superheater is arranged at the downstream of the high-pressure economizer and is used for producing steam meeting the steam turbine parameter requirements; the secondary low-pressure superheater is arranged between the high-pressure economizer stages and is used for generating steam meeting the parameter requirements of external heating equipment; the first-stage low-pressure superheater and the second-stage low-pressure superheater are connected in series through an interstage connecting pipeline.
When the unit operates, the primary low-pressure superheater heats saturated steam from the low-pressure steam drum to steam parameters meeting the power generation requirement, and the saturated steam is sent to the steam turbine through an outlet pipeline; the secondary low-pressure superheater further heats the superheated steam from the primary low-pressure superheater through an interstage connecting pipeline to a steam parameter meeting the heat supply requirement, and the superheated steam is sent to external heat supply equipment through a heat supply pipeline. Therefore, the utility model discloses can satisfy the demand of electricity generation and heat supply to steam simultaneously to the steam turbine and the different requirements of heating equipment to the steam parameter.
Furthermore, a control valve is arranged on the interstage connecting pipeline, and the unit can be switched between two operation working conditions of heat supply and pure condensation by opening or closing the control valve.
Furthermore, a desuperheater is arranged on the interstage connecting pipeline and used for desuperheating the superheated steam from the first-stage low-pressure superheater, and therefore the temperature of the steam at the outlet end of the second-stage low-pressure superheater can be reduced. When the unit is in different working conditions and loads, the temperature of the superheated steam is adjusted through the desuperheater so as to meet the requirements of heating equipment on the temperature of the heating steam under different working conditions and loads, and therefore, the operation of a unit heating system can be more flexible.
Therefore, the utility model discloses a carry out hierarchical setting and control to the low pressure over heater heating surface, can satisfy the electricity generation of unit and the demand of heat supply to steam simultaneously. Compared with the prior art, the utility model has the advantages of make the economic nature of unit and the flexibility when moving obtain improving greatly.
The utility model discloses can also be solved through following technical scheme to above-mentioned technical problem: the utility model discloses a come to setting up in the one-level low pressure over heater in high-pressure economizer low reaches for the flue gas, set up in the second grade low pressure over heater between high-pressure economizer heating surface stage, one-level low pressure over heater entry is connected with the low pressure steam pocket through first low pressure saturated steam pipeline and exports and be connected with the steam turbine through the export pipeline, second grade low pressure over heater entry is connected with the low pressure steam pocket through second low pressure saturated steam pipeline and exports and be connected with external heating equipment through the heat supply pipeline.
Preferably, a first control valve is arranged on the first low-pressure saturated steam pipeline.
Preferably, a second control valve is arranged on the second low-pressure saturated steam pipeline.
The above technical scheme of the utility model in, the low pressure over heater sets up to the second grade. The primary low-pressure superheater is arranged at the downstream of the high-pressure economizer and is used for producing steam meeting the steam turbine parameter requirements; the secondary low-pressure superheater is arranged between the high-pressure economizer stages and is used for generating steam meeting the parameter requirements of external heating equipment; the inlets of the first-stage low-pressure superheater and the second-stage low-pressure superheater are respectively connected with the low-pressure steam drum.
When the unit operates, the primary low-pressure superheater heats saturated steam from the low-pressure steam drum to a temperature which meets the parameter requirement of the saturated steam generated by the steam turbine, and then the saturated steam is sent to the steam turbine through an outlet pipeline; and the secondary low-pressure superheater heats saturated steam from the low-pressure steam drum to a temperature which meets the steam parameter requirement of the heat supply equipment, and then the saturated steam is sent to external heat supply equipment through a heat supply pipeline.
Further, a first control valve is provided on the first low pressure saturation steam pipe.
Further, a second control valve is provided on the second low pressure saturated steam pipe.
By controlling the opening and closing of the first control valve and the second control valve, the unit can be switched between two working conditions of heat supply and pure condensation.
Therefore, the utility model discloses a carry out hierarchical setting and control to the low pressure over heater heating surface, solved the technical problem that prior art exists, provide the steam that accords with its parameter requirement for steam turbine and heating equipment respectively through one-level low pressure over heater and second grade low pressure over heater, satisfied the heat supply of unit simultaneously and the demand of electricity generation to steam. Compared with the prior art, the utility model has the advantages of make the economic nature of unit and the flexibility when moving obtain improving greatly.
Drawings
FIG. 1 is a schematic diagram of a preferred embodiment of the present invention;
fig. 2 is a schematic view of another preferred embodiment of the present invention.
Description of reference numerals: 1. a low pressure steam drum; 2. a low pressure saturated steam line; 3. a primary low-pressure superheater; 4. a secondary low-pressure superheater; 5. an outlet line; 6. an interstage connecting pipeline; 61. a control valve; 62 a desuperheater; 63. adjusting a valve; 7. a heat supply pipeline; 8. a high-pressure economizer; 9. a first low pressure saturated steam line; 91. a first control valve; 10. a second low pressure saturated steam line; 101. a second control valve.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.
Example 1: as shown in the attached figure 1, the utility model comprises a first-stage low-pressure superheater 3 arranged at the downstream of a high-pressure economizer 8 relative to flue gas, a second-stage low-pressure superheater 4 arranged between heating surfaces of the high-pressure economizer 8, wherein the inlet of the first-stage low-pressure superheater 3 is connected with a low-pressure steam drum 1 through a low-pressure saturated steam pipeline 2, the outlet of the first-stage low-pressure superheater is connected with a steam turbine through an outlet pipeline 5, the outlet of the second-stage low-pressure superheater 4 is connected with external heating equipment through a heating pipeline 7, and the inlet of the second-stage low-pressure;
the interstage connecting line 6 is provided with a control valve 61 and a desuperheater 62, and the desuperheater 62 is connected between the inlet of the secondary low-pressure superheater 4 and the control valve 61.
When the unit is in a pure condensing working condition, the control valve 61 is closed, low-pressure saturated steam from the low-pressure steam drum 1 enters the primary low-pressure superheater 3 through the low-pressure saturated steam pipeline 2, and the primary low-pressure superheater 3 heats the low-pressure saturated steam to a parameter value meeting the power generation requirement and then sends the low-pressure saturated steam to the steam turbine through the outlet pipeline 5. Under the working condition, the conventional pressure of low-pressure steam is not more than 0.6MPa, the temperature is below 280 ℃, the running efficiency of the combined cycle waste heat boiler is higher, and the output of a unit is higher.
When the unit is in a heat supply working condition, and the temperature and pressure requirements of heat supply users on low-pressure steam are higher (the conventional pressure is more than 1.1MPa, and the temperature is more than 300 ℃), the control valve 61 is opened, superheated steam from the primary low-pressure superheater 3 enters the secondary low-pressure superheater 4 through the interstage connecting pipeline 6, and is heated to the temperature and pressure parameters meeting the heat supply requirements through the secondary low-pressure superheater 4 and then is sent to the heat supply users through the heat supply pipeline 7.
When the heating system is in partial load operation (such as summer working condition), under the condition that the temperature of steam required by a heating user is low and the temperature of steam generated by the secondary low-pressure superheater 4 is overhigh, the regulating valve 63 is opened, and superheated steam from the primary low-pressure superheater 3 is mixed with desuperheater water from a condensing pump in the desuperheater 62 and then cooled; the superheated steam mixed with the temperature-reducing water and cooled enters the secondary low-pressure superheater 4 and is sent to a heat supply user through a heat supply pipeline 7. The flow of the desuperheater water entering the desuperheater 62 is adjusted by the adjusting valve 63, and the temperature of the steam at the outlet of the secondary low-pressure superheater 4 can be controlled, so that the temperature of the steam at the outlet of the secondary low-pressure superheater 4 meets the requirement of a heat supply user on the temperature of the steam.
Example 2: as shown in the attached figure 2, the utility model comprises a first-stage low-pressure superheater 3 arranged at the downstream of a high-pressure economizer 8 relative to flue gas, a second-stage low-pressure superheater 4 arranged between the heating surfaces of the high-pressure economizer 8, wherein the inlet of the first-stage low-pressure superheater 3 is connected with a low-pressure steam drum 1 through a first low-pressure saturated steam pipeline 9, the outlet of the first-stage low-pressure superheater is connected with a steam turbine through an outlet pipeline 5, the inlet of the second-stage low-pressure superheater 4 is connected with the low-pressure steam drum 1 through a second low-pressure saturated steam pipeline 10, and the outlet of the;
the first low pressure saturated steam pipeline 9 is provided with a first control valve 91, and the second low pressure saturated steam pipeline 10 is provided with a second control valve 101.
When the unit operates, the primary low-pressure superheater 3 heats the saturated steam from the low-pressure steam drum 1 to a temperature which meets the steam parameter requirement of the steam turbine for power generation, and then sends the saturated steam to the steam turbine through the outlet pipeline 5; the secondary low-pressure superheater 4 heats the steam from the low-pressure steam drum 1 to a temperature which meets the steam parameter requirement of the heat supply equipment, and then sends the steam to the external heat supply equipment through a heat supply pipeline 7.
By controlling the opening and closing of the first control valve 91 and the second control valve 101, the unit can be switched between two working conditions of heat supply and pure condensation.
Of course, the drawings and examples are only for the purpose of illustrating and explaining the present invention and should not be taken as unduly limiting the invention. All the technical solutions obtained by making equivalent adjustments and changes according to the present invention fall within the protection scope of the present invention.
Claims (6)
1. The low-pressure superheater system of the waste heat boiler is characterized by comprising a primary low-pressure superheater (3) which is arranged at the position, relative to flue gas, of a position downstream of a high-pressure economizer (8), and a secondary low-pressure superheater (4) which is arranged at the level of the heating surface of the high-pressure economizer (8), wherein the inlet of the primary low-pressure superheater (3) is connected with a low-pressure steam drum (1) through a low-pressure saturated steam pipeline (2), the outlet of the primary low-pressure superheater is connected with a steam turbine through an outlet pipeline (5), the outlet of the secondary low-pressure superheater (4) is connected with external heating equipment through a heating pipeline (7), and the inlet of the secondary low-pressure superheater is connected with the outlet pipeline (5).
2. A low-pressure superheater system for waste heat boiler as recited in claim 1, characterized in that: and a control valve (61) is arranged on the interstage connecting pipeline (6).
3. A low-pressure superheater system of a waste heat boiler according to claim 2, characterized in that a desuperheater (62) is further arranged on the inter-stage connecting line (6), and the desuperheater (62) is arranged between the inlet of the secondary low-pressure superheater (4) and the control valve (61).
4. The low-pressure superheater system of the waste heat boiler is characterized by comprising a primary low-pressure superheater (3) which is arranged at the position, relative to flue gas, of a position downstream of a high-pressure economizer (8), and a secondary low-pressure superheater (4) which is arranged at the position between heating surfaces of the high-pressure economizer (8), wherein the inlet of the primary low-pressure superheater (3) is connected with a low-pressure steam drum (1) through a first low-pressure saturated steam pipeline (9), the outlet of the primary low-pressure superheater is connected with a steam turbine through an outlet pipeline (5), the inlet of the secondary low-pressure superheater (4) is connected with the low-pressure steam drum (1) through a second low-pressure saturated steam pipeline (10), and the outlet of the secondary low-pressure superheater is connected with.
5. The low-pressure superheater system of the waste heat boiler according to claim 4, characterized in that a first control valve (91) is arranged on the first low-pressure saturated steam pipeline (9).
6. A low-pressure superheater system of a waste heat boiler according to claim 4 or 5, characterized in that a second control valve (101) is arranged on the second low-pressure saturated steam pipe (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022041682.4U CN212537810U (en) | 2020-09-17 | 2020-09-17 | Low-pressure superheater system of waste heat boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022041682.4U CN212537810U (en) | 2020-09-17 | 2020-09-17 | Low-pressure superheater system of waste heat boiler |
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| CN212537810U true CN212537810U (en) | 2021-02-12 |
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| CN202022041682.4U Active CN212537810U (en) | 2020-09-17 | 2020-09-17 | Low-pressure superheater system of waste heat boiler |
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