CN212052106U

CN212052106U - Improved paper machine soda system

Info

Publication number: CN212052106U
Application number: CN202020492075.7U
Authority: CN
Inventors: 朱建文
Original assignee: QINGDAO GAOYUAN THERMAL ENERGY POWER EQUIPMENT CO Ltd
Current assignee: QINGDAO GAOYUAN THERMAL ENERGY POWER EQUIPMENT CO Ltd
Priority date: 2020-04-07
Filing date: 2020-04-07
Publication date: 2020-12-01
Anticipated expiration: 2030-04-07

Abstract

The utility model relates to a modified paper machine soda system includes first pipeline and second pipeline along the direction of delivery of steam first pipeline on install first electrical control valve the second pipeline on install second isolating valve, vapour ejector, pressure transmitter and first isolating valve in proper order, first electrical control valve and vapour ejector all through the control box with pressure transmitter connect, the steam inlet that joins the back and inserts the dryer of first pipeline and second pipeline, the steam-water inlet that the steam-water separator was inserted to the play steam-water mouth of this dryer. The utility model has the advantages that changed traditional flash distillation notion, changed original flash tank into catch water, increaseed the recirculation volume of steam, made the steam flow rate increase in the dryer, improved heat transfer effect etc..

Description

Improved paper machine soda system

Technical Field

The utility model relates to a modified paper machine soda system belongs to the paper machine field.

Background

In the papermaking industry, the proportion of energy consumption to cost is very large, energy conservation is very important, and the existing steam-water system has the following problems:

1. the heat exchange capacity of the drying cylinder needs to be improved; 2. the steam ejector (also called a heat pump) has poor ejection effect; 3. the three problems of the complex system lead to high energy consumption and high system operation and maintenance cost. Due to the existence of the fourth-generation ejector (with the patent number of 201410416461.7 and the name of the invention of a joint-adjustment ejector), the optimization and consumption reduction of the system have conditions.

Disclosure of Invention

For overcoming prior art's defect, the utility model provides a modified paper machine soda system, the technical scheme of the utility model is:

the improved paper machine steam-water system comprises a first pipeline and a second pipeline along the conveying direction of steam, a first electric regulating valve is arranged on the first pipeline, a second isolating valve, a steam-steam ejector, a pressure transmitter and a first isolating valve are sequentially arranged on the second pipeline, the first electric regulating valve and the steam-steam ejector are connected with the pressure transmitter through a control box, the first pipeline and the second pipeline are merged and then connected to a steam inlet of the drying cylinder, the steam outlet of the drying cylinder is connected with a steam-water inlet of a steam-water separator, a first steam-water outlet of the steam-water separator is provided with a first branch pipe and a second branch pipe, the first branch pipe is connected into the steam-steam ejector, the second branch pipe is provided with a steam-wind heat exchange mechanism, and a water-air heat exchange mechanism is arranged at a second steam-water outlet of the steam-water separator and is communicated with the water-air heat exchange mechanism.

The steam-air heat exchange mechanism comprises a steam-air heat exchanger, a second electric regulating valve and a steam trap, wherein the second electric regulating valve is installed at a steam inlet of the steam-air heat exchanger, a temperature sensor is installed at a steam outlet of the steam-air heat exchanger, the temperature sensor is connected with the second electric regulating valve, a steam outlet of the steam-air heat exchanger is communicated with a water inlet of the steam trap, a water outlet of the steam trap is connected into the water-air heat exchange mechanism, and the temperature sensor is connected with the second electric regulating valve through a control box.

The water-air heat exchange mechanism comprises a water-air heat exchanger, a third isolation valve, a fourth isolation valve, a check valve and a condensate pump, a water inlet of the water-air heat exchanger is communicated with a water outlet of the steam trap, a third branch pipe and a fourth branch pipe are formed at a water outlet of the water-air heat exchanger, the check valve is installed on the third branch pipe, the third isolation valve, the condensate pump and the fourth isolation valve are sequentially installed on the fourth branch pipe, a condensate outlet is formed after the water outlets of the third branch pipe and the fourth branch pipe are communicated, and an air outlet of the water-air heat exchanger is communicated with an air inlet of the steam-air heat exchanger.

The steam-water separator is provided with a liquid level sensor, the liquid level sensor and the condensate pump are connected to a control box, and the liquid level sensor is connected with the condensate pump through the control box.

The utility model has the advantages that:

(1) the traditional flash evaporation concept is changed, the original flash evaporation tank is replaced by a steam-water separator, the recirculation quantity of steam is increased, the flow velocity of the steam in the drying cylinder is increased, and the heat exchange effect is improved.

(2) The adopted combined regulation type steam-steam ejector (patent number: 201410416461.7) has good ejection effect under variable working conditions, increases the circulation quantity, greatly improves the flow rate in a drying cylinder, improves the heat exchange effect, and can work normally and efficiently under lower pressure.

(3) The whole system is simplified, the number of devices is reduced as much as possible on the premise of ensuring the existing functions, one steam-water separator is different from the traditional multistage flash evaporation, at least two flash tanks are arranged, and the pipeline system is greatly simplified.

(4) The steam pressure, the wind temperature and the water level are automatically controlled.

(5) The condensate pump is arranged at the outlet of the water-air heat exchanger, so that the problem of cavitation is well solved.

Drawings

Fig. 1 is a schematic view of the main structure of the present invention.

Detailed Description

The invention will be further described with reference to specific embodiments, the advantages and features of the invention will become more apparent as the description proceeds. These examples are merely illustrative and do not limit the scope of the invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications are intended to be included within the scope of the invention.

Referring to fig. 1, the utility model relates to an improved paper machine steam-water system, including first pipeline and second pipeline along the direction of delivery of steam, first pipeline on install first electrical control valve 1, second pipeline on install second isolating valve 5, steam ejector 2, pressure transmitter 3 and first isolating valve 4 in proper order, first electrical control valve 1 and steam ejector 2 all through the control box with pressure transmitter 3 connect, the first pipeline and the steam inlet that joins of second pipeline insert drying cylinder 11, the steam outlet of this drying cylinder 11 inserts the soda entry of soda separator 12, the first steam exit of this soda separator 12 installs first branch pipe and second branch pipe, first branch pipe insert steam ejector 2, the second branch pipe on install steam-wind heat transfer mechanism, and a water-air heat exchange mechanism is arranged at a second steam-water outlet of the steam-water separator 12 and is communicated with the water-air heat exchange mechanism.

The steam-air heat exchange mechanism comprises a steam-air heat exchanger 6, a second electric regulating valve 9 and a steam trap 10, wherein the second electric regulating valve 9 is installed at a steam inlet of the steam-air heat exchanger 6, a temperature sensor 8 is installed at an air outlet of the steam-air heat exchanger 6, the temperature sensor 8 is connected with the second electric regulating valve 9, a steam outlet of the steam-air heat exchanger 6 is communicated with a water inlet of the steam trap 10, a water outlet of the steam trap 10 is connected into the water-air heat exchange mechanism, the temperature sensor 8 is connected with the second electric regulating valve 9 through a control box, and a hot air temperature sensor 8 signal is used for controlling the opening degree of the second electric regulating valve 9.

The water-air heat exchange mechanism comprises a water-air heat exchanger 7, a third isolation valve 14, a fourth isolation valve 15, a check valve 13 and a condensate water pump 17, a water inlet of the water-air heat exchanger 7 is communicated with a water outlet of the steam trap 10, a third branch pipe and a fourth branch pipe are formed at the water outlet of the water-air heat exchanger 7, the check valve 13 is installed on the third branch pipe, the third isolation valve 14, the condensate water pump 17 and the fourth isolation valve 15 are sequentially installed on the fourth branch pipe, a condensate water outlet is formed after the water outlets of the third branch pipe and the fourth branch pipe are communicated, and an air outlet of the water-air heat exchanger 7 is communicated with an air inlet of the steam-air heat exchanger 6.

The steam-water separator 12 is provided with a liquid level sensor 16, the liquid level sensor 16 and a condensate pump 17 are connected to a control box, the liquid level sensor 16 is connected with the condensate pump 17 through the control box, and signals fed back by the liquid level sensor are used for controlling the condensate pump through the control box.

The utility model discloses a theory of operation is: the new steam enters the drying cylinder in two paths, one path of the new steam passes through the steam ejector 2, the other path of the new steam passes through the first electric regulating valve 1, pressure signals sent by the pressure transmitter 3 are fed back to the control box, the steam outlet pressure of the steam ejector 2 and the steam outlet pressure of the first electric regulating valve are automatically regulated through the control box, the steam ejector is opened preferentially, and the first electric regulating valve is used for supplement.

When the paper machine or the steam ejector needs to be maintained, the first isolation valve 4 and the second isolation valve 5 are closed, and the first electric regulating valve 1 is used for supplying steam.

After steam enters a drying cylinder 11 and is cooled, a steam-water mixture is formed, the steam enters a steam-water separator 12 for steam-water separation, after the steam-water separation, the steam is divided into two paths, one path is injected into the drying cylinder 11 by a steam-steam injector 2 for cyclic heating, the other path enters a steam-air heat exchanger 6 through a second electric regulating valve 9 for heating air to form hot air, and a signal of a temperature sensor 8 is used for controlling the opening degree of the second electric regulating valve 9; the drained water of the steam-air heat exchanger 6 is mixed with the water coming from the steam-water separator through a steam trap 10 and enters a water-air heat exchanger 7 to heat air (cold air); the water draining of the water-air heat exchanger 7 is divided into two paths, one path passes through a condensate pump 17, and the two sides of the one path are provided with a third isolation valve 14 and a fourth isolation valve 15 for maintenance and isolation. The condensate pump carries out frequency conversion adjustment according to a signal of a liquid level transmitter on the steam-water separator 12 to control the water level; the other way is that the check valve 13 is opened when the condensed water pump is in failure or the water pump is not needed, and the condensed water is automatically conveyed outwards.

Claims

1. The improved paper machine steam-water system is characterized by comprising a first pipeline and a second pipeline along the conveying direction of steam, wherein a first electric regulating valve (1) is installed on the first pipeline, a second isolating valve (5), a steam-steam ejector (2), a pressure transmitter (3) and a first isolating valve (4) are sequentially installed on the second pipeline, the first electric regulating valve (1) and the steam-steam ejector (2) are connected with the pressure transmitter (3) through a control box, the first pipeline and the second pipeline are connected into a steam inlet of a drying cylinder (11) after being converged, a steam outlet of the drying cylinder (11) is connected into a steam-water inlet of a steam-water separator (12), a first branch pipe and a second branch pipe are installed at a first steam-water outlet of the steam-water separator (12), and the first branch pipe is connected into the steam-steam ejector (2), the second branch pipe is provided with a steam-air heat exchange mechanism, a second steam-water outlet of the steam-water separator (12) is provided with a water-air heat exchange mechanism, and the steam-air heat exchange mechanism is communicated with the water-air heat exchange mechanism.

2. The improved paper machine steam-water system according to claim 1, characterized in that the steam-wind heat exchange mechanism comprises a steam-wind heat exchanger (6), a second electric regulating valve (9) and a steam trap (10), the second electric regulating valve (9) is installed at the steam inlet of the steam-wind heat exchanger (6), a temperature sensor (8) is installed at the air outlet of the steam-wind heat exchanger (6), the temperature sensor (8) is connected with the second electric regulating valve (9), the steam outlet of the steam-wind heat exchanger (6) is communicated with the water inlet of the steam trap (10), the water outlet of the steam trap (10) is connected to the water-wind heat exchange mechanism, and the temperature sensor (8) is connected with the second electric regulating valve (9) through a control box.

3. The improved paper machine steam-water system according to claim 2, characterized in that the water-wind heat exchange mechanism comprises a water-wind heat exchanger (7), a third isolation valve (14), a fourth isolation valve (15), a check valve (13) and a condensate pump (17), a water inlet of the water-wind heat exchanger (7) is communicated with a water outlet of the steam trap (10), a third branch pipe and a fourth branch pipe are formed at a water outlet of the water-wind heat exchanger (7), the check valve (13) is installed on the third branch pipe, the third isolation valve (14), the condensate pump (17) and the fourth isolation valve (15) are sequentially installed on the fourth branch pipe, a condensate outlet is formed after the water outlets of the third branch pipe and the fourth branch pipe are communicated, and an air outlet of the water-wind heat exchanger (7) is communicated with an air inlet of the steam-wind heat exchanger (6).

4. The improved paper machine soda system according to claim 2, characterized in that a level sensor (16) is mounted on said soda separator (12), said level sensor (16) and a condensate pump (17) are connected to a control box, said level sensor (16) is connected to said condensate pump (17) through said control box.