System for efficient gradient utilization of steam
By designing a system for efficient cascade utilization of steam, and using desuperheaters and automatic control valves to regulate steam temperature, the system achieves efficient utilization of steam on the secondary side of the steam turbine, solves the problem of insufficient steam utilization, improves power generation capacity, and reduces water energy consumption.
Patent Information
- Application Number
- CN202422903581.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-27
AI Technical Summary
In the existing technology, the small amount of steam used on the secondary side of the steam turbine limits the generator's exhaust volume and power generation capacity, and the steam utilization is not efficient enough, resulting in poor economic performance.
Design a system for efficient cascade utilization of steam, which includes a primary steam transport pipeline, a steam turbine generator, a low-pressure high-temperature steam transport pipeline, a desuperheater, a low-pressure desuperheating steam transport pipeline, and a dryer, combined with a desuperheating water tank and an automatic control valve, to achieve efficient regulation and utilization of steam.
This improved the efficient cascade utilization of steam, met the drying temperature requirements, reduced water energy consumption, increased power generation, and lowered production costs.
Smart Images
Figure CN223525520U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to steam efficient utilization technical field, especially in a kind of efficient cascade utilization steam system. BACKGROUND
[0002] The present company uses external primary steam, which is superheated steam with a pressure of 0.8-0.95 MPa and a temperature of 270-330 ℃. The primary steam first enters the plant heat station. A part of the primary steam is reduced in temperature and pressure, and then converted into secondary steam with a pressure of 0.55 MPa and a temperature of 165 ℃. The secondary steam is mainly used for the process system and waste gas recovery system. Another part of the primary steam enters a back pressure steam turbine for power generation. Through the operation of the steam turbine, the exhaust steam of the steam turbine is low-pressure steam on the secondary side. The amount of steam on the secondary side of the steam turbine directly affects the exhaust capacity and power generation capacity of the steam turbine. In the initial design, the selection of the steam turbine and the calculation of the steam consumption are both based on the maximum heat load. However, in actual operation, the steam turbine is operated for a long time under a heat load less than the rated heat load. Considering the economy, the optimal operating condition of the steam turbine is under the rated heat load. However, according to the actual operation, the small amount of steam on the secondary side of the steam turbine limits the exhaust capacity and power generation capacity of the steam turbine. Therefore, it is of great significance to study a system for efficient utilization of steam on the secondary side of the steam turbine, to ensure the full utilization of the steam on the secondary side of the steam turbine, and to improve the efficient cascade utilization of steam. SUMMARY
[0003] To solve the above problems, the utility model provides a kind of efficient cascade utilization steam system, reaches the purpose that steam turbine secondary steam is efficiently utilized.
[0004] To achieve the above purpose, the utility model adopts the following technical scheme: a kind of efficient cascade utilization steam system, including primary steam delivery pipeline, steam turbine generator, low-pressure high-temperature steam delivery pipeline, desuperheater, low-pressure desuperheated steam delivery pipeline, dryer, desuperheater water tank;
[0005] The outlet of the primary steam delivery pipeline is connected to one end of the steam turbine generator. The other end of the steam turbine generator is connected to the inlet of the low-pressure high-temperature steam delivery pipeline. The outlet of the low-pressure high-temperature steam delivery pipeline is connected to one end of the desuperheater. The other end of the desuperheater is connected to the inlet of the low-pressure desuperheated steam delivery pipeline. The outlet of the low-pressure desuperheated steam delivery pipeline is connected to the dryer.
[0006] The desuperheater water tank is connected to the desuperheater through a desuperheater water delivery pipe.
[0007] Preferably, a steam flow meter is arranged on the low-pressure high-temperature steam delivery pipeline.
[0008] Preferably, a desuperheating automatic control valve is arranged on the desuperheater water delivery pipe.
[0009] Preferably, the temperature sensor is connected to the low-pressure desuperheating steam conveying pipeline away from the desuperheating automatic valve end.
[0010] Preferably, the temperature sensor is connected to the low-pressure desuperheating steam conveying pipeline away from the desuperheating automatic valve end.
[0011] Preferably, the desuperheating water conveying pipe is provided with a desuperheating water pump.
[0012] Preferably, the desuperheating water in the desuperheating water tank is condensate water of the nearby equipment.
[0013] The utility model discloses the beneficial effect has:
[0014] 1. Adopt the desuperheating automatic valve control high temperature steam and the adjustment proportion of desuperheating water, adjust the temperature of the steam after desuperheating, guarantee the secondary steam of supply drying use to meet the temperature pressure condition of drying to the fibre, meet the requirement of the moisture content of the fibre after drying.
[0015] 2. The utility model discloses utilize equipment condensate water, and condensate water recycling greatly reduces water energy consumption.
[0016] 3. The utility model discloses process reasonable simple, production cost is low, and installation is convenient, and the function is complete, and the steam of steam turbine secondary side is fully utilized, has promoted the efficient gradient utilization of steam, has improved the power generation of steam turbine generator simultaneously. DRAWINGS
[0017] Fig. 1 It is the steam trend schematic diagram in steam turbine generator in the utility model.
[0018] Fig. 2 It is the working process schematic diagram of the utility model.
[0019] In the drawing: primary steam conveying pipeline 1, steam turbine generator 2, steam turbine secondary side low-pressure steam 3, low-pressure high-temperature steam conveying pipeline 4, steam flowmeter 5, desuperheating automatic valve 6, desuperheater 7, temperature sensor 8, desuperheating water conveying pipeline 9, desuperheating water pump 10, desuperheating water tank 11, low-pressure desuperheating steam conveying pipeline 12, drying machine 13. DETAILED DESCRIPTION
[0020] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making the creative labor belong to the range of protection of the utility model.
[0021] As Figs. 1-2The utility model discloses a following technical scheme is adopted in the specific embodiment of the utility model: a kind of high-efficiency cascade utilization steam's system, including primary steam delivery pipeline 1, steam turbine generator 2, low-pressure high-temperature steam delivery pipeline 4, desuperheater 7, low-pressure desuperheated steam delivery pipeline 12, dryer 13, desuperheating water tank 11;Primary steam delivery pipeline 1 is connected with the one end of steam turbine generator 2 of export, and the other end of steam turbine generator 2 is connected with the inlet of low-pressure high-temperature steam delivery pipeline 4, and the export of low-pressure high-temperature steam delivery pipeline 4 is connected with the one end of desuperheater 7, and the other end of desuperheater 7 is connected with the inlet of low-pressure desuperheated steam delivery pipeline 12, and the export of low-pressure desuperheated steam delivery pipeline 12 is connected with dryer 13;
[0022] Desuperheater 7 is connected with desuperheater 7 by desuperheating water delivery pipe 9.
[0023] Low-pressure high-temperature steam delivery pipeline 4 is provided with steam flowmeter 5. Desuperheating water delivery pipe 9 is provided with desuperheating automatic control valve 6. Temperature sensor 8 is connected with low-pressure desuperheated steam delivery pipeline 12 away from desuperheating automatic control valve 6 end. Desuperheating water pump 10 is provided on desuperheating water delivery pipe 9. Desuperheating water in desuperheating water tank 11 is condensate water of nearby equipment.
[0024] System working principle explanation: the primary steam of primary steam delivery pipeline 1 is input steam turbine generator 2, and the primary steam is 0.8-0.95MPa, 270-330 ℃ superheated steam. The output steam turbine secondary side low-pressure steam 3 is 0.18MPa pressure, 200 ℃ temperature. Steam flowmeter 5 has temperature compensation PT100, pressure compensation transmitter, steam flow data access DCS, and shows steam instantaneous and cumulative flow. Temperature sensor 8 selects PT100 (armored), and temperature sensor 8 detects the temperature of steam after desuperheating, so as to adjust the adjustment ratio of high-temperature steam and desuperheating water of desuperheating automatic control valve 6, and automatically adjust the temperature of steam turbine secondary side low-pressure steam 3 according to the use amount of steam turbine secondary side low-pressure steam 3, to ensure that the steam turbine secondary side low-pressure steam 3 used by dryer 13 meets the temperature and pressure conditions for drying fiber. Desuperheater 7 is cooled by using desuperheating water (temperature 95 ℃) for steam turbine secondary side low-pressure steam 3, and the temperature of steam turbine secondary side low-pressure steam 3 is automatically adjusted according to the steam use amount of dryer, and desuperheater 7 can continuously adjust within the range of 0-100% of rated flow, and when the load changes within the range of 10%-100% of rated outlet flow, the device ensures long-term safe and stable continuous operation, and reaches the technical performance requirements, and control signal accesses DCS, realizes remote setting of steam temperature, high and low temperature alarm. Desuperheating water pump 10 operating state and switch control DCS system, set up trip alarm. The low-pressure steam temperature of steam turbine secondary side low-pressure steam 3 after desuperheating water cooling of desuperheater 7 is reduced to 125 ℃, and is used for dryer 13.
[0025] The original steam used in the dryer 13 has a steam pressure of 0.6 MPa and a temperature of 165 DEG C. After the air is heated in the dryer 13, the 165 DEG C steam is converted into 158 DEG C steam condensate, and the enthalpy difference is calculated to be 2092.13 KJ / kg.
[0026] In the present application, the low-pressure steam 3 from the secondary side of the steam turbine has a pressure of 0.18 MPa and a temperature of 200 DEG C. After the temperature is reduced by the desuperheating water (temperature 95 DEG C) in the desuperheater 7, the temperature is reduced to 125 DEG C. After the air is heated in the dryer 13, the steam is converted into 116 DEG C steam condensate, and the enthalpy difference is calculated to be 2221.7 KJ / kg.
[0027] In the present application, the enthalpy difference of the low-pressure steam 3 from the secondary side of the steam turbine is greater than the enthalpy difference of the original steam used in the dryer 13, and the temperature of the steam in the heater is also above 116 DEG C. Therefore, in the present application, the low-pressure steam 3 from the secondary side of the steam turbine after temperature reduction can meet the requirements of the drying temperature of the dryer 13, and thus the original heating steam can be replaced by the low-pressure steam 3 from the secondary side of the steam turbine after temperature reduction, which can fully meet the requirements of drying.
[0028] The working process is as follows: the primary steam enters the steam turbine generator 2 through the primary steam delivery pipeline 1 to generate electricity. Through the operation of the steam turbine generator 2, the exhaust steam of the steam turbine generator 2 is the low-pressure steam 3 from the secondary side of the steam turbine. The low-pressure steam 3 from the secondary side of the steam turbine is delivered to the desuperheater 7 through the low-pressure high-temperature steam delivery pipeline 4. The desuperheating water is delivered to the desuperheater 7 by the desuperheating water pump 10 through the desuperheating water delivery pipeline 9, and the desuperheating water reduces the temperature of the low-pressure steam 3 from the secondary side of the steam turbine in the desuperheater 7. The low-pressure steam 3 from the secondary side of the steam turbine after temperature reduction is delivered to the dryer 13 through the low-pressure desuperheated steam delivery pipeline 12, and the air is heated in the dryer 13 to dry the fibers.
[0029] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principle of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.
Claims
1. A system for efficient cascade utilization of steam, characterized in that, The system comprises a primary steam conveying pipe, a steam turbine generator, a low-pressure high-temperature steam conveying pipe, an attemperator, a low-pressure attempered steam conveying pipe, a dryer, and an attemperating water tank. An outlet of the primary steam conveying pipe is connected to one end of the steam turbine generator, another end of the steam turbine generator is connected to an inlet of the low-pressure high-temperature steam conveying pipe, an outlet of the low-pressure high-temperature steam conveying pipe is connected to one end of the attemperator, another end of the attemperator is connected to an inlet of the low-pressure attempered steam conveying pipe, and an outlet of the low-pressure attempered steam conveying pipe is connected to the dryer. The attemperating water tank is connected to the attemperator through an attemperating water conveying pipe.
2. The system according to claim 1, wherein a steam flow meter is arranged on the low-pressure high-temperature steam conveying pipe. An attemperating automatic valve is arranged on the attemperating water conveying pipe.
3. The system for efficient cascade utilization of steam according to claim 1, characterized in that, A temperature sensor is connected to the attemperating automatic valve away from the attemperating water conveying pipe end.
4. The system for efficient cascade utilization of steam according to claim 3, characterized in that, 5. The system according to claim 4, wherein the temperature sensor is connected to the low-pressure attempered steam conveying pipe away from the attemperating automatic valve end. An attemperating water pump is arranged on the attemperating water conveying pipe. Attemperating water in the attemperating water tank is condensate water of nearby equipment.
6. The system for efficient cascade utilization of steam according to claim 1, characterized in that, 7. The system for efficient cascade utilization of steam according to claim 1, characterized in that,