Steam turbine high pressure heater drain thermal control system

Abstract

The utility model relates to the technical field of steam turbines, in particular to a steam turbine high-pressure heater hydrophobic thermal control system, comprising a high-pressure heater, and also comprising: a high-pressure water inlet pipe, a high-pressure water outlet pipe, a first pipe, a deaerator, a water side pipe, a steam side pipe, a temperature compensation double-chamber compensation container, and a condensing chamber. One end of the high-pressure water inlet pipe is arranged on the high-pressure heater, one end of the high-pressure water outlet pipe is arranged on the high-pressure heater, one end of the first pipe is arranged on the high-pressure heater, the deaerator is arranged at the other end of the first pipe, the water side pipe is arranged at the upper end of the high-pressure heater, the steam side pipe is arranged at the lower end of the high-pressure heater, the temperature compensation double-chamber compensation container is arranged on the other side of the water side pipe and the steam side pipe, and the condensing chamber is arranged on the upper surface of the temperature compensation double-chamber compensation container, thereby improving the real-time monitoring, alarm and automatic protection functions of the high-pressure heater by operating personnel, reducing the equipment failure rate, and greatly improving the intuitiveness, sensitivity, rapidity and reliability of the device.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a steam turbine high-pressure heater drain thermal control system. Background Art

[0002] As we all know, the main function of the steam turbine high-pressure heater includes using part of the steam turbine exhaust to heat the feed water to increase the temperature of the feed water, thereby reducing the temperature difference between the feed water entering the boiler and the furnace. In this way, the high-pressure heater can improve the operating economy of the steam turbine and reduce the overall operating cost of the power system. At the same time, it can reduce boiler fuel consumption and improve the thermal efficiency of the power plant. In addition, the high-pressure heater can also reduce the amount of steam entering the condenser, recover part of the condensation heat of the steam, and reduce the loss of the cold source.

[0003] The drain discharge of the steam turbine high-pressure heater is directly related to the safety of the steam turbine body. When the water supply pipe inside the heater bursts and the drain discharge protection cannot be put into operation in time, when the drain pours into the turbine cylinder, the entire steam turbine will suffer water hammer and be directly scrapped.

[0004] The existing thermal control system technology uses a float switch as a thermal control element to directly control the opening and closing of the emergency drain electric door. There is no remote signal and alarm, and there are many shortcomings. For example, the float switch is installed on the heater wall, the temperature is as high as 200°C, and the internal conductive copper element of the switch is rapidly oxidized at a high temperature above 150°C, and the switch function is lost, resulting in many control failures and thermal protection failures. There is no water level remote signal to the control room, and the operating personnel cannot monitor and discover it in time, which is a great safety hazard for the turbine. In order to solve the above problems, a steam turbine high-pressure heater drain thermal control system is needed. Utility Model Content

[0005] The utility model aims to provide a steam turbine high-pressure heater drain thermal control system, which solves the problem in the background technology that excessive temperature affects the float switch and the operating personnel cannot monitor and find water level information in time.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] The steam turbine high pressure heater drain thermal control system includes a high pressure heater and further includes:

[0008] A high-pressure water inlet pipe, one end of which is arranged on the high-pressure heater;

[0009] a high-pressure water outlet pipe, one end of which is arranged on the high-pressure heater;

[0010] a first tube, one end of which is disposed on the high-pressure heater;

[0011] a deaerator, the deaerator being arranged at the other end of the first tube;

[0012] a water side pipe, the water side pipe being arranged at the upper end of the high pressure heater;

[0013] a steam side pipe, the steam side pipe being arranged at the lower end of the high pressure heater;

[0014] A temperature compensation double-chamber compensation container, wherein the temperature compensation double-chamber compensation container is arranged on the other side of the water side pipe and the steam side pipe;

[0015] A condensation chamber is arranged on the upper surface of the temperature compensation double-chamber compensation container.

[0016] Preferably, a main pipe is arranged on the high-pressure water inlet pipe and the high-pressure water outlet pipe.

[0017] Preferably, the support platforms, each of which is arranged on the main pipe.

[0018] Preferably, a high-pressure steam turbine is arranged on the support platform.

[0019] Preferably, a medium-pressure steam turbine is arranged on the main pipe.

[0020] Preferably, the low-pressure steam turbine, each of the low-pressure steam turbines is arranged on the main pipe.

[0021] Preferably, a monitoring computer is arranged on the outer surface of the temperature-compensating dual-chamber compensation container.

[0022] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0023] 1. The sample is naturally cooled to room temperature through the sampling pipeline, and the water level signal is converted into a DC signal by a high-precision differential pressure transmitter and transmitted to the background DCS thermal control system to achieve multi-functional monitoring, alarm, and automatic control of the emergency drain door, so that the high-pressure heater protection device can achieve the purpose of sensitive, fast, safe, reliable and economical operation.

[0024] 2. Without destroying the original structure of the high-pressure heater, add tees to the water-side and steam-side pipes of the original on-site water level gauge of the high-pressure heater, take out the lower drain water level and upper steam chamber pressure signals to the newly modified double-chamber temperature compensation balance container, establish the reference (standard) water level signal and the actual water level as the variable signal, use the capacitive intelligent high-precision differential pressure transmitter to compare the variable signal with the reference scalar signal, convert it into a negative shift of 100%, and convert it into a DC4-20 mA current signal in direct proportion to the actual 0-600 mm water level, and transmit it to the analog module of the thermal control DCS system. After being processed by the DCS system CPU, the remote display, alarm, and control of the emergency drain door to automatically or manually operate in the control room.

[0025] 3. It improves the real-time monitoring, alarm and automatic protection functions of the high-voltage heater by the operating personnel, reduces the equipment failure rate, and greatly improves the intuitiveness, sensitivity, rapidity and reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a side view structural schematic diagram of the utility model;

[0027] Figure 2 It is a left-side structural schematic diagram of the utility model;

[0028] Figure 3 This is the working flow chart of the thermal system of the heater of the utility model.

[0029] Among them: 1. High-pressure heater; 2. High-pressure water inlet pipe; 3. High-pressure water outlet pipe; 4. First pipe; 5. Deaerator; 6. Water side pipe; 7. Steam side pipe; 8. Temperature compensation double-chamber compensation container; 9. Condensation chamber; 10. Main pipe; 11. Support platform; 12. High-pressure steam turbine; 13. Medium-pressure steam turbine; 14. Low-pressure steam turbine; 15. Monitoring computer. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] See also Figure 1-3 The steam turbine high-pressure heater drain thermal control system includes a high-pressure heater 1. The high-pressure heater 1 has the functions of increasing the feed water temperature, reducing the cold source loss, improving the economy and safety of the unit, reducing the use cost, and protecting the entire steam turbine. It also includes: a high-pressure water inlet pipe 2, a high-pressure water outlet pipe 3, a first pipe 4, a deaerator 5, a water side pipe 6, a steam side pipe 7, a temperature compensation double-chamber compensation container 8, a condensing chamber 9, one end of the high-pressure water inlet pipe 2 is detachably connected to the high-pressure heater 1, and the function of the high-pressure water inlet pipe 2 is to transport steam to the inside of the high-pressure heater 1, and one end of the high-pressure water outlet pipe 3 is detachably connected to the high-pressure heater 1. The function of the high-pressure water outlet pipe 3 The steam processed inside the high-pressure heater 1 is transported back to the main pipe 10. One end of the first pipe 4 is detachably connected to the high-pressure heater 1. The function of the first pipe 4 is to transport the water of the high-pressure heater 1 to the deaerator 5. The deaerator 5 is detachably connected to the other end of the first pipe 4. The water side pipe 6 is detachably connected to the upper end of the high-pressure heater 1. The steam side pipe 7 is detachably connected to the lower end of the high-pressure heater 1. The function of the steam side pipe 7 is to facilitate the transport of the steam inside the high-pressure heater 1 to the temperature compensation double-chamber compensation container 8. The temperature compensation double-chamber compensation container 8 is detachably connected to the other side of the water side pipe 6 and the steam side pipe 7. The condensation chamber 9 is detachably connected to the upper surface of the temperature compensation double-chamber compensation container 8.

[0033] It also includes: a main pipe 10, a support platform 11, a medium-pressure steam turbine 13, a high-pressure steam turbine 12, a low-pressure steam turbine 14, and a monitoring computer 15. The main pipe 10 can be detachably connected to the high-pressure water inlet pipe 2 and the high-pressure water outlet pipe 3. The function of the main pipe 10 is to facilitate the transportation of steam to the inside of each steam turbine unit. Each support platform 11 can be detachably connected to the main pipe 10. The function of the support platform 11 is to facilitate the support of each steam turbine to increase the stability during power generation. The high-pressure steam turbine 12 can be detachably connected to the support platform 11, the medium-pressure steam turbine 13 can be detachably connected to the main pipe 10, and each low-pressure steam turbine 14 can be detachably connected to the support platform 11. The disassembled connection is on the main pipe 10. The function of the high-pressure steam turbine 12, the medium-pressure steam turbine 13 and the low-pressure steam turbine 14 is to utilize high-temperature and high-pressure steam to pass through the fixed nozzle to become an accelerated airflow and then spray it onto the blades, so that the rotor equipped with the blade row rotates and at the same time does work externally. The mechanical energy generated is often used to drive the generator to generate electricity, thus playing an indispensable role in the development of modern society. The monitoring computer 15 is fixedly connected to the outer surface of the temperature-compensating double-chamber compensation container 8. The function of the monitoring computer 15 is to facilitate the operation and control of the temperature-compensating double-chamber compensation container 8 and observe the operation status to prevent safety hazards.

[0034] The sample is naturally cooled to room temperature through the sampling pipeline, and the water level signal is converted into a DC signal by a high-precision differential pressure transmitter and transmitted to the background DCS thermal control system to achieve multi-functional monitoring, alarm, and automatic control of the emergency drain valve, so that the high-pressure heater 1 protection device can achieve the purpose of sensitive, fast, safe, reliable and economical operation.

[0035] Under the premise of not destroying the original high-pressure heater 1 body structure, a tee is added to the water side pipe 6 and the steam side pipe 7 of the original local water level gauge of the high-pressure heater 1, and the lower drain water level and the upper steam chamber pressure signal are taken out to the newly modified temperature compensation double-chamber compensation container 8, and the reference (standard) water level signal and the actual water level are used as the variable signal. The variable signal is compared with the reference scalar signal by using a capacitive intelligent high-precision differential pressure transmitter, and then converted into a negative migration of 100% and a DC4-20 mA current signal in direct proportion to the actual 0-600 mm water level, and transmitted to the analog module of the thermal control DCS system. After being processed by the DCS system CPU, the remote display, alarm, and control of the emergency drain door automatic or manual operation in the control room are displayed and alarmed.

[0036] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit thereof, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steam turbine high-pressure heater drain thermal control system, comprising a high-pressure heater (1), characterized in that: Also includes: a high-pressure water inlet pipe (2), one end of the high-pressure water inlet pipe (2) being arranged on the high-pressure heater (1); a high-pressure water outlet pipe (3), one end of the high-pressure water outlet pipe (3) being arranged on the high-pressure heater (1); a first tube (4), one end of the first tube (4) being arranged on the high-pressure heater (1); a deaerator (5), the deaerator (5) being arranged at the other end of the first tube (4); a water side pipe (6), the water side pipe (6) being arranged at an upper end of the high-pressure heater (1); a steam side pipe (7), the steam side pipe (7) being arranged at the lower end of the high-pressure heater (1); A temperature compensation double-chamber compensation container (8), wherein the temperature compensation double-chamber compensation container (8) is arranged on the other side of the water side pipe (6) and the steam side pipe (7); A condensation chamber (9), wherein the condensation chamber (9) is arranged on the upper surface of the temperature compensation double-chamber compensation container (8).

2. The steam turbine high pressure heater drain thermal control system according to claim 1, characterized in that: Also includes: A main pipe (10), wherein the main pipe (10) is arranged on the high-pressure water inlet pipe (2) and the high-pressure water outlet pipe (3).

3. The steam turbine high pressure heater drain thermal control system according to claim 2, characterized in that: Also includes: A support platform (11), each of the support platforms (11) is arranged on the main pipe (10).

4. The steam turbine high pressure heater drain thermal control system according to claim 3, characterized in that: Also includes: A high-pressure steam turbine (12), wherein the high-pressure steam turbine (12) is arranged on the support platform (11).

5. The steam turbine high pressure heater drain thermal control system according to claim 4, characterized in that: Also includes: A medium-pressure steam turbine (13), wherein the medium-pressure steam turbine (13) is arranged on the main pipe (10).

6. The steam turbine high pressure heater drain thermal control system according to claim 5, characterized in that: Also includes: A low-pressure steam turbine (14), each of the low-pressure steam turbines (14) is arranged on the main pipe (10).

7. The steam turbine high pressure heater drain thermal control system according to claim 6, characterized in that: include: A monitoring computer (15), wherein the monitoring computer (15) is arranged on the outer surface of the temperature compensation double-chamber compensation container (8).

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