CN104595721B - High pressure separate type temperature reducing system - Google Patents

Abstract

The high-pressure separation type desuperheating system of the present invention relates to a high-pressure steam separation type desuperheating device, which is especially suitable for steam temperature and pressure adjustment occasions such as turbine systems and boiler systems. Including high-pressure separate desuperheating system including decompression device, desuperheating device, desuperheating water regulating valve, regulating valve, first manual shut-off valve, second manual shut-off valve and filter; the regulating valve communicates with the upstream through the first manual shut-off valve The bypass is connected; the regulating valve and the desuperheating device are connected through pipelines, and the connecting part is connected by a flange, and a 90° elbow is welded in the middle of the pipeline; the desuperheating water inlet flange is left in the middle of the desuperheating device; the main steam pipeline A decompression device is installed at the front, and the front and rear ends of the decompression device are connected to the main pipeline through different diameter pipes, and flanges are installed at the connection; A desuperheating water regulating valve, a filter and a second manual shut-off valve are sequentially connected in series at the branch outlet of the desuperheating device.

Description

High pressure separate desuperheating system

technical field

The high-pressure separation type desuperheating system of the present invention relates to a high-pressure steam separation type desuperheating device, which is especially suitable for steam temperature and pressure adjustment occasions such as turbine systems and boiler systems.

Background technique

The mainstream way to obtain stable steam in the existing market is to obtain stable pressure and temperature steam after the upstream unstable high-pressure steam is processed by a complete set of temperature and pressure reduction equipment. Among them, the pressure of the desuperheating water in the desuperheating part must be greater than the steam pressure, otherwise it is easy to cause steam backflow. If the pressure of the high-pressure steam is greater than the pressure of the desuperheating water, when the desuperheating device is opened, the high-pressure steam flows back into the low-pressure desuperheating water device instantly, and the desuperheating device does not work, and instead damages the desuperheating device, even causing safety hazards.

purpose of invention

The purpose of the present invention is to provide a high-pressure separate desuperheating system for the above disadvantages, which allows desuperheating water of any pressure to be mixed with it, and has high flexibility. The neutralization flow rate can be double-controlled by the steam flow control element and the desuperheating water flow control element to ensure the stability of the downstream steam temperature. In the case that the desuperheating water pressure cannot be increased in some equipment and facilities, this system can solve such problems very well, without re-planning, designing and purchasing equipment.

Contents of the invention

The high-pressure separation desuperheating system of the present invention is realized by adopting the following technical solutions:

The high-pressure separated desuperheating system includes a high-pressure separated desuperheating system including a decompression device, a desuperheating device, a desuperheating water regulating valve, a regulating valve, a first manual shut-off valve, a second manual shut-off valve and a filter; the regulating valve passes through the first A manual stop valve is connected to the upstream open bypass; the regulating valve and the desuperheating device are connected through a pipeline, and the connecting part is connected by a flange, and a 90° elbow is welded in the middle of the pipeline; there is a desuperheating water inlet in the middle of the desuperheating device flange;

A decompression device is installed at the front of the main steam pipeline, and the front and rear ends of the decompression device are connected to the main pipeline through reducers, and flanges are installed at the joints;

The pipe at the outlet of the decompression device has a welding hole for the support frame of the desuperheater, and the desuperheater is inserted into the pipe at the outlet of the decompression device through the support frame; the lower part of the desuperheater is provided with a nozzle to control the flow;

A desuperheating water regulating valve, a filter and a second manual shut-off valve are sequentially connected in series at the branch outlet of the desuperheating device.

The decompression device, the desuperheating water regulating valve and the regulating valve are respectively connected with the actuator, and are all equipped with positioners.

The decompression device is a decompression valve.

The desuperheating device and the supporting frame are connected by bolts and nuts.

Working principle: The high-pressure separated desuperheating system of the present invention pressurizes the desuperheating water by diverting the upstream high-pressure steam, and finally mixes it with the main steam to achieve the purpose of temperature control.

Advantages of the invention: the high-pressure separated desuperheating system of the present invention, through the diversion of the upstream high-pressure steam, pressurizes the desuperheating water, and finally mixes it with the main steam to achieve the purpose of temperature control. It allows any pressure of desuperheated water to be mixed with it, which has high flexibility. The neutralization flow rate can be double-controlled by the steam flow control element and the desuperheating water flow control element to ensure the stability of the downstream steam temperature. In the case that the desuperheating water pressure cannot be increased in some equipment and facilities, this system can solve such problems very well, without re-planning, designing and purchasing equipment.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing:

Fig. 1 is a schematic diagram of the structure of the high-pressure separation desuperheating system of the present invention.

In the figure: 1. Second manual shut-off valve, 2. Filter, 3. Regulating valve for desuperheating water, 4. Desuperheating device, 5. Pressure reducing device, 6. Regulating valve, 7. First manual shut-off valve, 8 , High-voltage drainage, 9, DCS remote control room.

detailed description

With reference to accompanying drawing 1, the high-pressure separation type desuperheating system of the present invention comprises the high-pressure separation type desuperheating system comprises decompression device 5, desuperheating device 4, desuperheating water regulating valve 3, regulating valve 6, first manual cut-off valve 7, the second Manual shut-off valve 1 and filter 2; regulating valve 6 is connected to the upstream open bypass through the first manual shut-off valve 7; regulating valve 6 and desuperheating device 4 are connected through pipelines, and the connecting parts are connected by flanges. A 90° elbow is welded in the middle of the pipe; a cooling water inlet flange is left in the middle of the cooling device 4;

A decompression device 5 is installed at the front of the main steam pipeline, and the front and rear ends of the decompression device 5 are connected to the main pipeline through reducers, and flanges are installed at the joints;

On the pipeline at the outlet of the decompression device 5, there is a welding hole for the support frame of the desuperheating device, and the desuperheating device 4 is inserted into the pipeline at the outlet of the decompression device through the support frame; the lower part of the desuperheating device 4 is provided with a nozzle for controlling flow;

A desuperheating water regulating valve 3 , a filter 2 and a second manual shut-off valve 1 are sequentially connected in series at the branch outlet of the desuperheating device 4 .

The decompression device 5, the desuperheating water regulating valve 3 and the regulating valve 6 are respectively connected with the actuator, and are all equipped with positioners.

The decompression device 5 is a decompression valve.

The desuperheating device 4 is connected to the supporting frame by bolts and nuts.

Specific embodiments: the detailed high-pressure steam separation type desuperheating device of the embodiment of the present invention, the upstream superheated steam is reduced to the pressure required by the downstream process through the decompression device 5, so the pressure at the upstream high-pressure diversion place 8 is always higher than the downstream outlet pressure , The upstream high-pressure drainage place 8 is drilled and welded, and the first manual shut-off valve 7 is opened under normal working conditions. If it needs to be closed, it can be closed manually.

The high-pressure steam is diverted through the regulating valve 6, and the flow rate can be controlled by the regulating valve 6. It can be in various structural forms such as control valves, venturi tubes, etc., and its function is to control the amount of steam entering. The regulating valve 6 passes through the positioner It is connected with DCS remote control room 9 to realize remote control and maintenance.

The steam from the high-pressure drainage is mixed with the desuperheating water in the desuperheating device 4 to increase the pressure of the desuperheating water, and the filter 2 prevents impurities from affecting the desuperheating device 4 . The desuperheating water regulating valve 3 is a flow control element, and its function is similar to that of the regulating valve 6 to control the desuperheating water flow. The desuperheating water regulating valve 3 and the regulating valve 6 have a specific correlation, and can separately control diversion steam and desuperheating water according to design requirements.

The pressure of the desuperheating water is smaller than the pressure of the steam after decompression by the decompression device 5, and the high-pressure steam can be diverted through the present invention without purchasing new equipment.

When the upstream steam flow is very small, the desuperheating water regulating valve 3 and regulating valve 6 control the flow of steam and desuperheating water respectively, and mix them according to a certain ratio. After mixing, they pass through the desuperheating device 4 and then mix with the outlet steam. Warm water pressure ensures that the pressure of the desuperheating water is higher than the outlet steam pressure, so that the desuperheating device 4 can be used normally. The desuperheating water regulating valve 3 controls the desuperheating water flow, the purpose is to control the outlet steam temperature, and its flow rate directly affects the outlet steam temperature.

When the upstream steam flow increases, the desuperheating water regulating valve 3 and regulating valve 6 re-control the flow of steam and desuperheating water according to the setting needs, and the DCS can be remotely adjusted to achieve a new balance.

The above-mentioned embodiments show only some that may be used and produced similarly to achieve the purpose and characteristics of the present invention. The high-pressure separate desuperheating device of the present invention is to save costs and embody a brand-new desuperheating idea. The above-mentioned implementation is only It is an embodiment of the present invention and should not be regarded as limited by the description of the embodiment. Since those skilled in the art can make many simple modifications and changes based on the present invention, the present invention will not be limited to the specific structure, operation and description, and similar appropriate modifications or equivalents are within the scope of the appended claims.

Claims (3)

1. A high-pressure separated desuperheating system, characterized in that: the high-pressure desuperheated system comprises a decompression device, a desuperheating device, a desuperheating water regulating valve, a regulating valve, a first manual shut-off valve, a second manual Stop valve and filter; the regulating valve is connected to the upstream open bypass through the first manual stop valve; the regulating valve and the desuperheating device are connected through pipelines, and the connecting parts are connected by flanges, and welded at 90° in the middle of the pipeline Elbow; there is a cooling water inlet flange in the middle of the cooling device; A decompression device is installed at the front of the main steam pipeline, and the front and rear ends of the decompression device are connected to the main steam pipeline through reducers, and flanges are installed at the joints; The pipe at the outlet of the decompression device has a welding hole for the support frame of the desuperheater, and the desuperheater is inserted into the pipe at the outlet of the decompression device through the support frame; the lower part of the desuperheater is provided with a nozzle to control the flow; A desuperheating water regulating valve, a filter and a second manual shut-off valve are sequentially connected in series at the branch outlet of the desuperheating device; The decompression device, desuperheating water regulating valve and regulating valve are respectively connected with the actuator, and are equipped with positioners; The locator is connected with the DCS remote control room. 2. The high-pressure separation desuperheating system according to claim 1, characterized in that: the decompression device is a decompression valve. 3. The high-pressure separate desuperheating system according to claim 1, characterized in that: the desuperheating device and the support frame are connected by bolts and nuts.