Quick starting system of temperature and pressure reduction device
By setting up a hot spare operating pipeline in parallel in the temperature reduction and pressure reduction device and using a multi-stage throttling orifice plate, the flow control problem in the hot spare state is solved, and rapid start is achieved, avoiding steam waste and economic losses.
Patent Information
- Application Number
- CN202421197206.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-29
AI Technical Summary
The existing temperature and pressure reducing devices are difficult to accurately control the flow rate in the hot standby state, resulting in long-term steam passing through the system and causing economic losses.
A quick start system including the main operating pipeline system, the hot spare operating pipeline system and the control system is designed. The hot spare operating pipeline is set in parallel, and the multi-stage throttle orifice plate is used to reduce the operating pressure to achieve rapid start.
By reducing the steam pressure and temperature, the start time of the temperature reduction and pressure reduction device is shortened, steam waste is avoided, and economic losses are significantly reduced.
Smart Images
Figure CN222316691U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of electric power energy technology, and in particular to a quick start system for a temperature and pressure reduction device. Background Art
[0002] The deep peak regulation of thermal power units is unpredictable, and in order to ensure the stability of steam heating, the temperature reduction and pressure reduction device needs to be used in hot standby. At present, the hot standby method usually adopts the method of opening the temperature reduction and pressure reduction valve and related valve groups, and adopts low load and low flow operation. At this time, due to the control accuracy of the valve, it is difficult to control the flow, resulting in a long time for steam to flow to the system through the temperature reduction and pressure reduction device, resulting in large economic losses throughout the year. Utility Model Content
[0003] The main purpose of this application is to provide a quick start system for a temperature and pressure reduction device, aiming to solve the above-mentioned technical problems.
[0004] The technical solutions adopted in this application are as follows:
[0005] A rapid start-up system for a temperature reduction and pressure reduction device comprises a main operating pipeline system, a hot standby operating pipeline system and a control system, wherein the control system is used to control the operating states of the main operating pipeline system and the hot standby operating pipeline system, the hot standby operating pipeline system is arranged in parallel with the main operating pipeline system, and the hot standby operating pipeline system comprises a hot standby operating pipeline, an isolation valve for opening the hot standby operating pipeline and a multi-stage throttling orifice plate for reducing the operating pressure of the hot standby operating pipeline.
[0006] Optionally, the isolation valve used to open the hot standby operation pipeline includes a manually opened isolation valve B and an automatically opened electric isolation valve B.
[0007] Optionally, the main operating pipeline system includes a front operating pipeline, a rear operating pipeline and a cooling water operating pipeline, the front operating pipeline and the rear operating pipeline are arranged in series, and the cooling water operating pipeline and the front operating pipeline are arranged in parallel.
[0008] Optionally, in the front running pipeline, an inlet steam electric isolation valve, an inlet pressure sensor, an inlet temperature sensor, a pressure reducing valve, a desuperheater and a safety valve are arranged from the inlet end of the front running pipeline to the rear.
[0009] Optionally, the front running pipeline is further provided with a drain branch, the drain branch is connected between the inlet temperature sensor and the pressure reducing valve, and a drain valve is provided on the drain branch.
[0010] Optionally, the cooling water running pipeline is connected to the nozzle of the desuperheater, and the cooling water running pipeline is provided with a cooling water control system valve group, and the cooling water control system valve group includes a flow meter, a pressure sensor for the cooling water running pipeline, an automatically opened electric isolation valve A, a throttle valve, a regulating valve, a manually opened isolation valve A and a check valve arranged from the inlet end of the cooling water running pipeline to the back.
[0011] Optionally, the outlet end of the post-operating pipeline is provided with an outlet steam electric isolation valve, a post-operating pipeline temperature sensor, and a post-operating pipeline pressure sensor.
[0012] Optionally, the outlet end of the post-operation pipeline is connected to a heating pipeline, the heating pipeline is connected to a steam turbine, and a steam turbine extraction switching valve is provided on the heating pipeline.
[0013] Compared with the prior art, the beneficial effects of this application are:
[0014] A quick start system for a temperature reduction and pressure reduction device proposed in an embodiment of the present application connects a hot standby operating pipeline in parallel to the main operating pipeline system and utilizes a multi-stage throttling orifice plate designed on the hot standby operating pipeline to reduce the pressure. Due to the characteristics of steam itself, the pressure is reduced and the temperature is lowered at the same time, so that the front operating pipeline and the rear operating pipeline of the temperature reduction and pressure reduction device can handle the hot standby state for a long time, shortening the startup time, avoiding steam waste, and effectively reducing economic losses. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 A schematic diagram of the structure of a quick start system for a temperature reduction and pressure reduction device provided in an embodiment of the present application.
[0016] Description of the reference numerals in the accompanying drawings:
[0017] 1-inlet steam electric isolation valve, 2-pressure reducing valve, 3-desuperheater, 4-mixing section, 5-safety valve, 6-outlet steam electric isolation valve, 7-steam turbine, 8-control system, 9-flow meter, 10-electric isolation valve A, 11-throttle valve, 12-regulating valve, 13-isolation valve A, 14-check valve, 15-electric isolation valve B, 16-isolation valve B, 17-inlet pressure sensor, 18-inlet temperature sensor, 19-multi-stage throttling orifice, 20-steam turbine extraction switch valve, 21-drain valve, 22-post-operation pipeline temperature sensor, 23-post-operation pipeline pressure sensor, 24-pressure sensor for desuperheating water operation pipeline. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0019] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0020] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.
[0022] See attached Figure 1 An embodiment of the present application provides a quick start system for a temperature reduction and pressure reduction device, including a main operating pipeline system, a hot standby operating pipeline system and a control system 8. The control system 8 is used to control the operating status of the main operating pipeline system and the hot standby operating pipeline system. The hot standby operating pipeline system is arranged in parallel with the main operating pipeline system.
[0023] Specifically:
[0024] like Figure 1As shown, the main operation pipeline system includes a front operation pipeline, a rear operation pipeline and a cooling water operation pipeline. The front operation pipeline and the rear operation pipeline are connected in series as an integrated arrangement, and the cooling water operation pipeline is arranged in parallel with the front operation pipeline.
[0025] Among them, in the front operation pipeline, from the inlet end of the front operation pipeline to the rear, an inlet steam electric isolation valve 1, an inlet pressure sensor 17, an inlet temperature sensor 18, a pressure reducing valve 2, a desuperheater 3 and a safety valve 5 are arranged. The outlet end of the rear operation pipeline is provided with an outlet steam electric isolation valve 6, a rear operation pipeline temperature sensor 22, and a rear operation pipeline pressure sensor 23. The outlet end of the rear operation pipeline is connected to the heating pipeline, and the heating pipeline is connected to the steam turbine 7. The steam extraction switch valve of the steam turbine 7 is arranged on the heating pipeline.
[0026] In the above, the cooling water running pipeline is connected to the nozzle of the cooler 3, the front running pipeline behind the cooler 3 is the mixing section 4, and the cooling water running pipeline is provided with a cooling water control system 8 valve group. The cooling water control system 8 valve group includes a flow meter 9, a pressure sensor 24 for the cooling water running pipeline, an automatically opened electric isolation valve A10, a throttle valve 11, a regulating valve 12, a manually opened isolation valve A13 and a check valve 14 arranged from the inlet end of the cooling water running pipeline to the rear.
[0027] At the same time, the front running pipeline is also provided with a drain branch, the drain branch is connected between the inlet temperature sensor 18 and the pressure reducing valve 2, and a drain valve 21 is provided on the drain branch.
[0028] like Figure 1 As shown, the hot standby operation pipeline system includes a hot standby operation pipeline, an isolation valve for opening the hot standby operation pipeline, and a multi-stage throttling orifice plate 19 for reducing the operation pressure of the hot standby operation pipeline. Among them, the isolation valve for opening the hot standby operation pipeline includes a manually opened isolation valve B16 and an automatically opened electric isolation valve B15.
[0029] In this embodiment, the control system 8 is respectively connected to the inlet pressure sensor 17, the inlet temperature sensor, the pressure reducing valve 2, the electric isolation valve B15, the regulating valve 12, the electric isolation valve A10, the rear operating pipeline temperature sensor 22, the rear operating pipeline pressure sensor 23, the flow meter 9 and the pressure sensor 24 for the cooling water operating pipeline.
[0030] Based on the above content, the embodiment of the present application provides a rapid start-up system for a temperature and pressure reduction device, and its working process is:
[0031] When the temperature reduction and pressure reduction device is in hot standby, the hot standby operation pipeline is used, and the hot standby control command is issued through the control system 8 to open the isolation valve B16, the electric isolation valve B15 and the multi-stage throttling orifice 19 in the hot standby operation pipeline. First, the required pipe diameter of the bypass system is calculated according to the heat dissipation loss of the system. Usually, the valve group of the hot standby pipeline system can be satisfied with a very small pipe diameter to avoid a large amount of steam leakage caused by a slight opening of the pressure reducing valve 2, thereby achieving energy saving effect; secondly, the aperture of the energy-saving orifice selection is repeatedly calculated and verified through the operating parameters, design parameters and the required pressure drop and temperature drop to meet the steam parameters after the temperature reduction and pressure reduction device; finally, by opening the hot standby bypass, a small amount of steam automatically flows from the high-pressure side to the low-pressure side, and the pressure is reduced through the multi-stage throttling orifice 19. Due to the characteristics of the steam itself, the pressure is reduced and the temperature is reduced at the same time, so that the front and rear pipelines of the temperature reduction and pressure reduction device are in a hot standby state for a long time, shortening the startup time.
[0032] Based on the working principle, the hot standby operation logic of the temperature and pressure reduction device can be obtained as follows:
[0033] The control system 8 issues a hot standby command and opens the steam turbine extraction switch valve 20 to ensure normal external heat supply and sufficient steam work; opens the outlet steam electric isolation valve 6 to fill the rear operating pipeline of the cooling and pressure reducing device with steam, and the rear operating pipeline leads to the external heat supply pipeline, and discharges the existing drain to the downstream drain point; opens the inlet steam electric isolation valve 1 to fill the front pipeline of the cooling and pressure reducing device with steam, and regularly uses the drain valve 21 to drain water; closes the pressure reducing valve 2 and the cooling water control system 8 valve group to avoid large-scale steam leakage during hot standby and loss of economy; opens the electric isolation valve B15 and isolation valve B16, and the system is in hot standby state.
[0034] Operation logic of the temperature reduction and pressure reduction device: When the temperature reduction and pressure reduction device is put into operation normally: the control system 8 issues an equipment startup command, automatically closes the electric isolation valve B15 in the hot standby operation pipeline system, and can also choose to manually close the isolation valve B16. According to the set secondary steam temperature and pressure, collect the pressure, temperature and flow signals of the inlet pressure sensor 17, inlet temperature sensor 18, post-operation pipeline temperature sensor 22, post-operation pipeline pressure sensor 23, temperature reduction water operation pipeline pressure sensor 24 and flowmeter 9, open the inlet steam electric isolation valve 1, pressure reducing valve 2, electric isolation valve A10, throttle valve 11, isolation valve A13, control the opening of the pressure reducing valve 2 to control the secondary steam pressure, control the regulating valve 12 and the nozzle to control the secondary steam temperature, and realize the normal operation of the temperature reduction and pressure reduction device.
[0035] Based on the above process, a rapid start-up system for a temperature reduction and pressure reduction device provided in an embodiment of the present application avoids the waste of a large amount of steam in hot standby by designing a hot standby operation pipeline system and utilizing a small-diameter bypass pipeline and a valve group. Taking the external heat supply flow rate of 100t / h with primary steam of 17Mpa / 540℃ and secondary steam of 4Mpa / 450℃ as an example, the flow rate of the warm pipe with a pipe diameter of DN10 is 0.3t / h, and the power loss caused by throttling is about 4KW. If a pressure reducing valve warm pipe is used, the power loss caused by the flow rate of 1t / h, 2t / h, and 3t / h is about 14.5KW, 29KW, and 43.5KW. Usually, the temperature reduction and pressure reduction device must operate normally at a flow rate of 10% or more. For example, when it is 10%, the flow rate is 10t / h, and the power loss caused is about 145KW. Using this warm pipe start-up can reduce the equipment startup time. According to the metal wall temperature increase rate requirement of 3℃ / min, 3 hours of startup time can be saved. It can be seen that the present application can shorten the startup time, avoid steam waste, and effectively reduce economic losses.
[0036] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims
1. A rapid start-up system for a temperature and pressure reduction device, characterized in that: It includes a main operating pipeline system, a hot standby operating pipeline system and a control system. The control system is used to control the operating status of the main operating pipeline system and the hot standby operating pipeline system. The hot standby operating pipeline system is arranged in parallel with the main operating pipeline system. The hot standby operating pipeline system includes a hot standby operating pipeline, an isolation valve for opening the hot standby operating pipeline, and a multi-stage throttling orifice plate for reducing the operating pressure of the hot standby operating pipeline.
2. The rapid start-up system for a temperature and pressure reduction device according to claim 1, characterized in that: The isolation valve used to open the hot standby operation pipeline includes a manually opened isolation valve B and an automatically opened electric isolation valve B.
3. The rapid start-up system for a temperature and pressure reduction device according to claim 1, characterized in that: The main operation pipeline system includes a front operation pipeline, a rear operation pipeline and a cooling water operation pipeline. The front operation pipeline and the rear operation pipeline are arranged in series, and the cooling water operation pipeline and the front operation pipeline are arranged in parallel.
4. The rapid start-up system for a temperature and pressure reduction device according to claim 3, characterized in that: In the front running pipeline, an inlet steam electric isolation valve, an inlet pressure sensor, an inlet temperature sensor, a pressure reducing valve, a desuperheater and a safety valve are arranged from the inlet end of the front running pipeline to the rear.
5. The rapid start-up system for a temperature and pressure reduction device according to claim 4, characterized in that: The front running pipeline is also provided with a drain branch, the drain branch is connected between the inlet temperature sensor and the pressure reducing valve, and the drain branch is provided with a drain valve.
6. The rapid start-up system for a temperature and pressure reduction device according to claim 4, characterized in that: The cooling water running pipeline is connected to the nozzle of the desuperheater, and the cooling water running pipeline is provided with a cooling water control system valve group. The cooling water control system valve group includes a flow meter, a pressure sensor for the cooling water running pipeline, an automatically opened electric isolation valve A, a throttle valve, a regulating valve, a manually opened isolation valve A and a check valve arranged from the inlet end of the cooling water running pipeline to the back.
7. The rapid start-up system for a temperature and pressure reduction device according to claim 3, characterized in that: The outlet end of the post-operation pipeline is provided with an outlet steam electric isolation valve, a post-operation pipeline temperature sensor, and a post-operation pipeline pressure sensor.
8. The rapid start-up system for a temperature and pressure reduction device according to claim 3, characterized in that: The outlet end of the post-operation pipeline is connected to a heat supply pipeline, the heat supply pipeline is connected to a steam turbine, and a steam turbine extraction switch valve is arranged on the heat supply pipeline.