CN106227279B - Steam quality modulating system - Google Patents

Abstract

A steam quality modulation system, including a steam generator, a gas collection tank and three branches connected in parallel between the two, the steam generator in branch I is directly connected to the gas collection tank in a normally open state, A humidification device is installed in the branch road II, a dehumidification device is installed in the branch road III, and the outlet pipe of the gas collection tank is connected with the steam-using equipment and equipped with a dryness meter. The feature of the present invention is that the steam of each branch is merged in the gas collecting tank, and according to the dryness value of the steam measured by the dryness meter, the branch II and the branch III are switched, and the steam flow is adjusted through the valve, so that different ratios can be realized. Mixing of dry and wet steam. In addition, the addition of a signal controller can realize automatic detection and regulation of steam dryness. Applying the combined online pipeline steam dryness meter to this system can realize online real-time detection of steam quality in key sections of the silk production line. Good steam quality can not only guarantee the processing quality of shredded tobacco, improve energy utilization rate, but also effectively prolong the service life of valve parts and equipment.

Description

Steam Dryness Modulation System

technical field

The invention relates to steam detection and control, in particular to a steam dryness modulation system, which can realize the online detection and control of the steam dryness of pipelines on a silk production line.

Background technique

As an important clean energy, steam is widely used in industrial production and daily life. Saturated steam is widely used as the processing medium in the tobacco shred process, and the normal operation of the production line equipment, product quality and steam quality have a great relationship. Steam dryness is the mass percentage of dry saturated steam per kilogram of wet saturated steam. Saturated steam dryness is an important parameter to measure steam quality. Different processes require different steam dryness. In the cut leaf drum drying process, saturated steam is used as the heat supply medium, and the cylinder wall and hot air are heated through the heat exchange between the partition walls to provide a heat source for the drying and dehydration of shredded tobacco. Therefore, if superheated steam with a certain degree of superheat is used, a relatively satisfactory treatment effect can be obtained ; In the processes of loosening moisture, leaf moistening, HT moisture regain, and feeding, saturated steam is injected as a process medium and directly contacts with the product to provide it with a high temperature and humidity moisture recovery treatment environment, so it is more suitable to use saturated steam. The moisture content of the steam is unstable. For the operating conditions of the equipment, it will cause safety problems such as ineffective utilization of equipment efficiency, unstable control, and water hammer; for product quality, it will increase process consumption. Physical quality and sensory quality do not meet the requirements of process standards and many other problems.

Contents of the invention

The purpose of the present invention is to solve the potential safety hazards and product quality fluctuations brought by the steam quality to the silk production line, starting from the establishment of an efficient and convenient detection method for the moisture content of pipeline steam, through the optimization of steam pipeline configuration, steam dehumidification and humidification devices Based on the design and comprehensive matching application, a steam quality modulation system is proposed to effectively measure and accurately control the steam quality. Good steam quality can not only guarantee the processing quality of shredded tobacco, improve energy utilization rate, but also effectively prolong the service life of valve parts and equipment

The purpose of the present invention is achieved through the following technical solutions:

A steam quality modulation system, including a steam generator, a gas collection tank, and three branches connected in parallel between the two, the on-off of the three branches can be freely switched through valves; The generator and the gas collection tank are directly connected through pipelines, which are in a normally open state. A humidification device and a check valve are installed in the branch circuit II, a dehumidification device and a check valve are installed in the branch circuit III, and the gas outlet pipe of the gas collection tank It is connected with steam equipment, and a dryness meter is installed on the steam outlet pipeline. The dryness meter can realize the joint and real-time online detection of the pressure, flow rate, temperature, density and dryness of the wet saturated steam.

In the present invention, the desuperheater is selected as the desuperheater to dehumidify the steam, and the dehumidifier is used to dehumidify the steam as the dehumidifier.

The system is also equipped with a signal controller electrically connected to the dryness meter for automatic detection and regulation of the steam dryness, and regulating valves controlled by the signal controller are arranged on each branch.

More specifically, the specific working method and process of the present invention are as follows: three branches are included, the steam coming out of the steam generator in branch I directly enters the gas collecting tank; the steam coming out of the steam generator in branch II first The temperature is reduced and humidified by the humidification device, and then leads to the gas collection tank; the steam coming out of the steam generator in branch III is first dehumidified by the dehumidification device, and then leads to the gas collection tank. Branch Ⅰ is normally open, and branch 2 and branch 3 can be switched freely through the valve. According to the steam dryness value measured by the dryness meter, the signal controller can realize steam humidification and steam dehumidification by adjusting the steam flow of the relevant valve. , Different proportions of dry and wet steam are mixed to realize automatic detection and regulation of steam dryness.

The beneficial effect that the present invention can reach is:

1. Because branch 2 and branch 3 can be switched freely in the present invention, according to the steam dryness value measured by the dryness meter, the steam flow through the valve can be adjusted to realize steam humidification, steam dehumidification, mixing of dry and wet steam in different proportions, and improve steam efficiency. quality.

2. The combined online pipeline steam dryness meter can realize the joint measurement of the pressure, flow, temperature, density and dryness of the wet saturated steam, and conduct online real-time detection of the pipeline steam quality in key sections of the silk production line.

3. Because of the addition of a signal controller, the system can realize automatic detection and regulation of steam dryness.

4. This system can effectively measure the saturated steam and reasonably control the amount of water carried by the steam. At the same time, it can also achieve the purpose of improving the operation efficiency and stability of the equipment, improving the quality and stability of shredded tobacco products, and reducing the consumption of raw materials and energy in the process.

Description of drawings

Fig. 1 is a schematic diagram of structural connection of the present invention.

Fig. 2 is an overall schematic diagram of the structural connection and control system of the present invention.

Fig. 3 is a schematic diagram of a path composed of branch I and branch II.

Fig. 4 is a schematic diagram of the second path composed of the branch I and the branch III.

In the figure: 1 is the steam generator, 2 is the gas collection tank, 3 is the humidification device (ie desuperheater), 4 is the dehumidification device (ie steam-water separator), 5 is the dryness meter, and 6 is the signal controller.

Detailed ways

The present invention further describes its structure and connection relationship and control below in conjunction with accompanying drawing:

As shown in Figures 1 and 2: a steam dryness modulation system, including a steam generator 1, a gas collection tank 2, and three branches connected in parallel between the two, the on-off of the three branches are all through The valve can be switched freely; the branch Ⅰ is directly connected with the steam generator 1 and the gas collecting tank 2 through the pipeline, which is normally open, and the branch Ⅱ is equipped with a humidifying device 3 (ie desuperheater) and a check valve. Branch III is provided with a dehumidification device 4 (i.e., a steam-water separator) and a check valve. The outlet pipe of the gas collection tank is connected to the steam-consuming equipment, and a dryness meter 5 is installed on the outlet pipe. The dryness meter can realize the joint and real-time online detection of the pressure, flow rate, temperature, density and dryness of the wet saturated steam. The system is also equipped with a signal controller 6 electrically connected to the dryness meter 5 for automatic detection and regulation of the steam dryness, and regulating valves controlled by the signal controller are arranged on each branch.

The present invention further describes its working state below in conjunction with accompanying drawing:

Example 1:

As shown in Figure 3, the passage is composed of branch I and branch II. The main purpose is to reduce the dryness of the steam. Part of the steam from the steam generator is desuperheated and humidified through the desuperheater, and the other part directly leads to the collector. The gas tank joins the steam from the desuperheater. The steam coming out of the gas collecting tank is first measured by the dryness meter, and then enters the steam using equipment.

Example 2:

As shown in Figure 4, this path is composed of branch I and branch III. The main purpose is to increase the dryness of the steam. Part of the steam enters the steam-water separator to increase the dryness of the steam. Combine in the tank. The steam coming out of the gas collecting tank is first measured by the dryness meter, and then enters the steam using equipment.

By selecting various equipment, pipes, pipe fittings and valves of the pipeline steam quality regulation and measurement system, a detailed pipeline steam quality regulation measurement system is established, as shown in Figure 1. The system is composed of steam generator, desuperheater, steam-water separator, gas collecting tank, dryness meter, signal controller and supporting steam pipeline.

The detection and effective control of steam dryness can be realized through the above technical proposal. When the steam is sent to the process requiring low steam dryness, such as loosening and regaining moisture, open branch I and branch II, close branch III, and humidify the steam in the pipeline to obtain relatively humid steam. When the steam is sent to processes requiring high steam dryness such as silk drum drying, branch I and branch III are opened, branch II is closed, and the steam in the pipeline is dehumidified to obtain relatively dry steam. In short, branch Ⅰ is in the normally open state. According to the comparison between the dryness value of the steam measured by the dryness meter and the dryness value required by the steam-consuming equipment, branch Ⅱ and branch Ⅲ are continuously switched, and the steam flow is adjusted through the valve to realize Mixture of different proportions of steam dryness. The dry and wet steam are fully mixed and buffered in the steam collecting tank, and then enter the steam-consuming equipment after being measured by the steam dryness meter. A dryness meter is installed on the outlet pipe of the gas collection tank, which can measure the pressure, flow, temperature, density and dryness of the saturated steam, and transmit the processed dryness, flow, temperature and other signals to the signal controller. Comparing the pre-set dryness, flow and temperature signals, sending feedback signals respectively, controlling the electric control valve, adjusting the flow of each branch, so that the dryness, flow and temperature of the output steam meet the specified requirements, so as to realize the steam dryness. automatic detection and regulation. Table 1 and Table 3 are the data obtained after the steam generated by the steam generator is modulated through branch I and branch II, and Table 2 is the parameters of cooling water fed into the desuperheater in branch I. It can be seen that the steam dryness can be reduced by 10.0%-11.0% after the steam is humidified through the branch Ⅰ; the steam dryness can be increased by 15.0%-22.9% after the steam is dehumidified through the branch Ⅱ.

Table 1 Inlet steam

Flow (kg/s) temperature (K) Pressure (MPa) Dryness x 1 90 432.01 0.6 1.00 Branch Ⅰ 2 90 453.15 0.5 1.00 3 90 425.00 0.5 0.90 4 100 433.15 0.638 0.70 Branch Ⅱ 5 100 423.15 0.491 0.80 6 100 413.15 0.374 0.75

Table 2 Cooling water

Flow(kg/s) temperature (K) Pressure (Mpa) 1 10 293.15 0.1 Branch Ⅰ 2 10 293.15 0.1 3 10 293.15 0.1

Table 3 Export steam

Flow (kg/s) temperature (K) Pressure (MPa) Dryness x 1 100 399.15 0.249 0.89 Branch Ⅰ 2 100 418.15 0.433 0.90 3 100 403.15 0.279 0.81 4 81.1 428.15 0.294 0.86 Branch Ⅱ 5 87.4 418.15 0.433 0.92 6 84.25 413.15 0.374 0.89

Claims (2)

1. A steam dryness modulation system, characterized in that it includes a steam generator, a gas collection tank and three branches connected in parallel between the two, and the on-off of the three branches are all freely switched by valves ;Branch I is directly connected to the steam generator and the gas collection tank through pipelines, and is in a normally open state; in the branch II, a humidification device and a check valve are installed, and the humidification device uses a desuperheater to reduce the steam. temperature and humidification; branch III is equipped with a dehumidification device and a check valve, the outlet pipe of the gas collection tank is connected with the steam equipment, and a dryness meter is installed on the outlet pipe, which can realize the output Combined and real-time on-line detection of steam pressure, flow, temperature, density and dryness in the gas pipeline; the system is also equipped with a signal controller electrically connected to the dryness meter for automatic detection and monitoring of steam dryness. Regulating, each branch is equipped with a regulating valve controlled by a signal controller. 2. The steam dryness modulation system according to claim 1, wherein the dehumidification device uses a steam separator to dehumidify the steam.