CN111997948B

CN111997948B - Hydraulic sealing unit, oil way, reactor system and denitration catalyst evaluation system

Info

Publication number: CN111997948B
Application number: CN201910446923.2A
Authority: CN
Inventors: 刘伟; 林德海; 王宝冬; 刘子林; 马少丹
Original assignee: China Energy Investment Corp Ltd; National Institute of Clean and Low Carbon Energy
Current assignee: China Energy Investment Corp Ltd; National Institute of Clean and Low Carbon Energy
Priority date: 2019-05-27
Filing date: 2019-05-27
Publication date: 2022-10-11
Anticipated expiration: 2039-05-27
Also published as: CN111997948A

Abstract

The invention relates to the technical field of denitration catalyst evaluation, and discloses a hydraulic sealing unit, an oil circuit, a reactor system and a denitration catalyst evaluation system. The hydraulic sealing unit includes: the piston rod of the sealing oil cylinder is provided with a sealing oil cylinder connecting piece for connecting with the reactor connecting piece of the reactor; the reversing valve includes an oil inlet P, an oil return port T, an oil port A and an oil port B, When one of the oil port A and oil port B is connected with the oil inlet port P, the other is connected with the oil return port T. The oil port A is connected with the rodless cavity of the sealing cylinder through the first pipeline, and the oil port B is connected with the sealing oil port. The rod cavity of the oil cylinder is communicated through the second pipeline; the first pipeline is provided with a first one-way valve, and the first one-way valve is connected with a first bypass switch valve in parallel; the second pipeline is provided with a second one-way valve, The second one-way valve is connected in parallel with a second bypass switch valve. The hydraulic sealing unit can make the hydraulic sealing oil circuit not in working condition all the time, greatly shorten its working time, thereby improving the service life and safety performance.

Description

Hydraulic sealing unit, oil way, reactor system and denitration catalyst evaluation system

Technical Field

The invention relates to the technical field of denitration catalyst evaluation, in particular to a hydraulic sealing unit, a hydraulic sealing oil way, a reactor system and a denitration catalyst evaluation system.

Background

The main cause of photochemical smog and acid rain is NOx which is one of the main atmospheric pollutants, and the main problem of the current atmospheric pollution control is also NOx. At present, in the flue gas denitration process of a thermal power plant, a Selective Catalytic Reduction (SCR) method is widely applied due to the advantages of high removal efficiency (which can be more than or equal to 90 percent), no secondary pollution, reliable operation, convenient maintenance and the like. The full-size denitration catalyst evaluation system is used for evaluating key performance indexes such as denitration catalyst activity, denitration efficiency, ammonia escape, SO2/SO3, pressure drop and the like, and guiding the addition, replacement and regeneration of the denitration catalyst.

The denitration catalyst full-scale evaluation system usually adopts a hydraulic sealing device to seal each reactor so as to ensure that good air tightness is kept between the reactors and pipelines at high temperature.

However, in the case of a conventional hydraulic seal device which is operated for a long time and used at a high frequency, the temperature of hydraulic oil in the hydraulic seal is likely to be high, and oil leakage and the like are likely to occur when the hydraulic seal device is used for a long time. In addition, the phenomena of low transmission efficiency and the like are caused under the condition of long-time friction between the piston and the cylinder barrel of the sealed oil cylinder; the abnormal conditions cause that the full-scale evaluation system can not work normally, even air leakage and other phenomena occur during testing, and the physical health of testing personnel is seriously influenced.

Disclosure of Invention

The invention aims to provide a hydraulic sealing unit which can ensure that a hydraulic sealing oil circuit is not always in a working state, greatly shortens the working time of the hydraulic sealing oil circuit and improves the service life and the safety performance.

In order to achieve the above object, the present invention provides a hydraulic seal unit including: the piston rod of the sealed oil cylinder is provided with a sealed oil cylinder connecting piece used for being connected with a reactor connecting piece of a reactor; the reversing valve comprises an oil inlet P, an oil return port T, an oil port A and an oil port B, one of the oil port A and the oil port B is communicated with the oil return port T when the other oil port A is communicated with the oil inlet P, the oil port A is communicated with a rodless cavity of the sealed oil cylinder through a first pipeline, and the oil port B is communicated with a rod cavity of the sealed oil cylinder through a second pipeline; the first pipeline is provided with a first one-way valve, and the first one-way valve is connected with a first bypass switch valve in parallel; and a second one-way valve is arranged on the second pipeline and connected with a second bypass switch valve in parallel.

Through the technical scheme, because the oil port A of the reversing valve is communicated with the rodless cavity of the sealed oil cylinder through the first pipeline, the oil port B is communicated with the rod cavity of the sealed oil cylinder through the second pipeline, meanwhile, the first check valve arranged on the first pipeline is connected in parallel with the first bypass switch valve, the second check valve arranged on the second pipeline is connected in parallel with the second bypass switch valve, and therefore, in the actual use process, the sealed oil cylinder connecting piece of the sealed oil cylinder is connected with the reactor connecting piece of the reactor. For example, in an embodiment, the first check valve and the second check valve allow hydraulic oil to flow to the sealed oil cylinder, an oil inlet P and an oil outlet B of the reversing valve are communicated, the oil outlet a and an oil return port T are communicated, the first bypass switch valve is opened, at this time, hydraulic oil enters the rod cavity of the sealed oil cylinder through the second check valve, the hydraulic oil in the rod-free cavity of the sealed oil cylinder returns through the first bypass switch valve, at this time, a piston rod of the hydraulic oil cylinder drives the reactor to be separated from the pipeline, then a catalyst sample can be loaded, after the loading is completed, the reversing valve is adjusted to enable the oil inlet P and the oil outlet a to be communicated, the oil outlet B and the oil return port T are communicated, the first bypass switch valve is closed and the second bypass switch valve is opened, at this time, hydraulic oil enters the rod-free cavity of the sealed oil cylinder through the first check valve, the hydraulic oil in the rod cavity of the sealed oil cylinder returns through the second bypass switch valve, at this time, the piston rod of the hydraulic oil cylinder drives the reactor to be hermetically connected with the pipeline, then, leakage is detected, after no leakage is detected, the second bypass switch valve is closed, the bypass switch valve is closed simultaneously, the bypass switch valve is closed, the hydraulic oil cylinder is sealed and the bypass expansion device is sealed and the hydraulic oil cylinder is in a pressure-balanced state, thereby, the sealed oil cylinder, and the sealed oil cylinder is sealed oil cylinder. At the moment, the hydraulic oil in the hydraulic sealing oil path is not required to be in a working state all the time, so that the working time of the hydraulic sealing oil path is greatly shortened, the overhigh temperature rise of the hydraulic oil is avoided, and the service life and the safety performance are improved.

Furthermore, be provided with on the first pipeline be located hydraulic fluid port A with the throttling element between the first check valve, the one end of first bypass ooff valve is connected the throttling element with between the first check valve, the other end of first bypass ooff valve is connected first check valve with between the rodless chamber.

Further, the first check valve and the second check valve are arranged to allow hydraulic oil to flow from the sealed oil cylinder to the reversing valve;

and/or the presence of a gas in the gas,

the first check valve and the first bypass switching valve are formed as one check bypass switching valve, and the second check valve and the second bypass switching valve are formed as one check bypass switching valve.

Further, the clearance between the outer peripheral surface of the piston of the sealing oil cylinder and the inner peripheral surface of the cylinder barrel of the sealing oil cylinder is 0.6mm-1mm.

In addition, the application provides a hydraulic seal oil circuit, including hydraulic pump and a plurality of above arbitrary hydraulic seal unit, wherein, hydraulic pump passes through the third tube coupling with the oil inlet P of every switching-over valve.

Therefore, as mentioned above, the hydraulic oil in the hydraulic sealing oil path does not need to be in a working state all the time, thereby greatly shortening the working time of the hydraulic sealing oil path, avoiding the overhigh temperature rise of the hydraulic oil, and improving the service life and the safety performance.

Furthermore, a switch valve is respectively arranged on a third pipeline between the hydraulic pump and an oil inlet P of each reversing valve.

Furthermore, an oil return port T of each reversing valve is sequentially connected with a fine filter and an overflow valve along the oil return direction.

Further, the present application provides a reactor system comprising:

a base joint comprising a first interface, a second interface, and a third interface;

a first reactor, wherein one port of the first reactor is connected to the first interface through a telescopic pipe joint;

one port of the second reactor is connected to the second interface through a telescopic pipe joint;

the first reactor and the second reactor are respectively provided with a reactor connecting piece used for being connected with a sealing oil cylinder connecting piece on a piston rod of a sealing oil cylinder.

Therefore, in practical use, the reactor system can be used with any hydraulic sealing oil circuit in a matched manner, so that the first reactor and the second reactor can be respectively connected with the sealing oil cylinder connecting pieces on the piston rods of the corresponding sealing oil cylinders through the respective reactor connecting pieces, and thus, as the first bypass switch valve and the second bypass switch valve are closed simultaneously, the pressure maintaining effect on the sealing oil cylinders is achieved, hydraulic oil in the sealing oil cylinders is in a static state, and the pistons in the sealing oil cylinders and the external expansion force in the reactors are balanced, so that the reactor is stable, reliable and intact.

Further, a first switch valve is arranged at the other port of the first reactor; a second switch valve is arranged at the second interface; a third switch valve is arranged at the third interface; and a fourth switch valve is arranged at the other port of the second reactor, wherein the first switch valve, the second switch valve, the third switch valve and the fourth switch valve can be switched on and off, so that the first reactor and the second reactor can be connected in series, in parallel or used independently.

Finally, the present application provides a denitration catalyst evaluation system comprising a control unit, a hydraulic seal oil circuit as described in any of the above, and a reactor system as described in any of the above,

wherein the reactor connecting pieces of the first reactor and the second reactor are connected with the sealing oil cylinder connecting pieces of the first reactor and the second reactor respectively;

the control unit can control the hydraulic sealing oil circuit, so that the first reactor and the second reactor can be driven by the respective sealing oil cylinders to move close to and away from the basic joint.

Thus, as described above, the operational reliability of the denitration catalyst evaluation system is significantly improved.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of a hydraulic seal circuit according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the seal cylinder of FIG. 1;

FIG. 3 is a schematic diagram of a reactor system according to an embodiment of the present invention.

Description of the reference numerals

1-sealed oil cylinder, 2-reactor connecting piece, 3-sealed oil cylinder connecting piece, 4-reversing valve, 5-first one-way valve, 6-first bypass switch valve, 7-second one-way valve, 8-second bypass switch valve, 9-throttling piece, 10-piston, 11-cylinder barrel, 12-hydraulic pump, 13-hydraulic sealing unit, 14-switch valve, 15-fine filter, 16-overflow valve, 17-basic joint, 18-first interface, 19-second interface, 20-third interface, 21-first reactor, 22-second reactor, 23-telescopic pipe joint, 24-first switch valve, 25-second switch valve, 26-third switch valve and 27-fourth switch valve.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

Referring to the structure shown in fig. 1, the hydraulic sealing unit 13 provided by the present invention comprises a sealing cylinder 1 and a reversing valve 4, wherein a piston rod of the sealing cylinder 1 is provided with a sealing cylinder connection member 3 for connecting with a reactor connection member 2 of a reactor; the reversing valve 4 comprises an oil inlet P, an oil return port T, an oil port A and an oil port B, one of the oil port A and the oil port B is communicated with the oil inlet P, while the other is communicated with the oil return port T, the oil port A is communicated with a rodless cavity of the sealing oil cylinder 1 through a first pipeline, and the oil port B is communicated with a rod cavity of the sealing oil cylinder 1 through a second pipeline; wherein, the first pipeline is provided with a first one-way valve 5, and the first one-way valve 5 is connected with a first bypass switch valve 6 in parallel; and a second check valve 7 is arranged on the second pipeline, and a second bypass switch valve 8 is connected in parallel with the second check valve 7.

In this solution, the first check valve 5 and the second check valve 7 may allow only hydraulic oil to flow from the direction change valve 4 to the seal cylinder 1, or only hydraulic oil to flow from the seal cylinder 1 to the direction change valve 4, as shown in fig. 1.

Here, the explanation will be given taking as an example that the first check valve 5 and the second check valve 7 can allow only the hydraulic oil to flow from the direction change valve 4 to the seal cylinder 1. Through the technical scheme, because the oil port A of the reversing valve is communicated with the rodless cavity of the sealed oil cylinder through the first pipeline, the oil port B is communicated with the rod cavity of the sealed oil cylinder through the second pipeline, meanwhile, the first check valve arranged on the first pipeline is connected in parallel with the first bypass switch valve, the second check valve arranged on the second pipeline is connected in parallel with the second bypass switch valve, and therefore, in the actual use process, the sealed oil cylinder connecting piece of the sealed oil cylinder is connected with the reactor connecting piece of the reactor. An oil inlet P and an oil outlet B of a reversing valve are communicated, the oil outlet A is communicated with an oil return port T, a first bypass switch valve is opened, at the moment, hydraulic oil enters a rod cavity of a sealed oil cylinder through a second one-way valve, the hydraulic oil in a rodless cavity of the sealed oil cylinder returns oil through the first bypass switch valve, at the moment, a piston rod of the hydraulic oil cylinder drives a reactor to be separated from a pipeline, then a catalyst sample can be loaded, after the loading is finished, the reversing valve is adjusted to enable the oil inlet P to be communicated with the oil outlet A, the oil outlet B is communicated with the oil return port T, the first bypass switch valve is closed and the second bypass switch valve is opened, at the moment, the hydraulic oil enters the rodless cavity of the sealed oil cylinder through the first one-way valve, the hydraulic oil in the rod cavity of the sealed oil cylinder returns oil through the second bypass switch valve, at the moment, the piston rod of the hydraulic oil cylinder drives the reactor to be in sealed connection with the pipeline, then leakage detection is started, after no leakage is detected, the second bypass switch valve is closed, at the moment, the first bypass switch valve and the second bypass switch valve is closed at the moment, so that the hydraulic oil cylinder plays a role of acting on the sealed oil cylinder, the hydraulic oil cylinder, the piston in a static reaction of a pressure maintaining balance of a static reactor, and the expander, and accordingly, and the expander is enabled to be intact. At the moment, the hydraulic oil in the hydraulic sealing oil path is not required to be in a working state all the time, so that the working time of the hydraulic sealing oil path is greatly shortened, the overhigh temperature rise of the hydraulic oil is avoided, and the service life and the safety performance are improved.

Further, as shown in fig. 1, a throttling element 9 located between the oil port a and the first check valve 5 is arranged on the first pipeline, one end of the first bypass switch valve 6 is connected between the throttling element 9 and the first check valve 5, and the other end of the first bypass switch valve 6 is connected between the first check valve 5 and the rodless cavity. In this way, by the throttling regulating effect of the throttling member 9, such as a throttle valve or a throttle orifice, on the hydraulic oil, the movement speed of the piston of the seal cylinder 1 can be correspondingly regulated, thereby making the movement of the reactor smoother.

In addition, as described above, alternatively, the first check valve 5 and the second check valve 7 are provided for allowing the hydraulic oil to flow from the seal cylinder 1 to the direction change valve 4, or the first check valve 5 and the second check valve 7 may allow only the hydraulic oil to flow from the direction change valve 4 to the seal cylinder 1;

and/or, as shown in fig. 1, the check valve and the corresponding bypass switching valve may be two valves independent of each other, or, alternatively, the check valve and the corresponding bypass switching valve may be formed as one check bypass switching valve, that is, the first check valve 5 and the first bypass switching valve 6 are formed as one check bypass switching valve, and the second check valve 7 and the second bypass switching valve 8 are formed as one check bypass switching valve. Thereby simplifying the piping connection.

Further, as shown in fig. 2, the clearance between the outer peripheral surface of the piston 10 of the seal cylinder 1 and the inner peripheral surface of the cylinder tube 11 of the seal cylinder 1 is 0.5mm to 1mm, preferably 0.6mm to 1mm, more preferably 0.7mm, 0.8mm, or 0.9mm. For example, in one embodiment, the piston has a size of 500mm, an offset of (-0.3 mm, -0.5 mm), and the bore has an inner diameter of 500mm, and an offset of (+ 0.3mm, +0.5 mm). Thus, the transmission efficiency can be improved by 50 to 60 percent.

In addition, as shown in fig. 1, the present application provides a hydraulic sealing oil path, which includes a hydraulic pump 12 and a plurality of hydraulic sealing units 13 as described above, wherein the hydraulic pump 12 is connected to the oil inlet P of each directional control valve 4 through a third line.

Thus, as described above, after the first bypass switching valve and the second bypass switching valve are closed at the same time, the hydraulic pump 12 is stopped, and thus, the hydraulic oil in the hydraulic seal oil path does not need to be in a working state all the time, thereby greatly shortening the working time thereof, avoiding the over-high temperature rise of the hydraulic oil, and improving the service life and the safety performance.

Further, as shown in fig. 1, a switching valve 14 is respectively disposed on a third pipeline between the hydraulic pump 12 and the oil inlet P of each directional control valve 4, so that the switching valve 14 can be closed to prevent the hydraulic pump 12 from operating to deliver hydraulic oil to the seal cylinder 1 after the first bypass switching valve and the second bypass switching valve are closed simultaneously.

As shown in fig. 1, a fine filter 15 and a relief valve 16 are connected to the return port T of each selector valve 4 in this order in the return direction. The filter fineness of the fine filter 15 can be 5um to impurity that probably brings in the sealed hydro-cylinder 1 filters, thereby reaches the effect that increases the hydraulic seal oil circuit life, and the effect of overflow valve 16 is too big for preventing the pressure in return circuit in the hydraulic seal oil circuit, guarantees that hydraulic oil normally operates in the return circuit.

In addition, as shown in fig. 1, a coarse filter is connected to an oil inlet of the hydraulic pump 12, and the filtering precision of the coarse filter may be 20um, so as to filter the hydraulic oil. The outlet of the hydraulic pump 12 is connected with the inlet of the switch valve 14 through a pressure gauge, and the pressure gauge reflects the real-time pressure value of the outlet of the oil tank.

Further, the first bypass opening/closing valve 6, the second bypass opening/closing valve 8, and the opening/closing valve 14 may be electrically operated valves.

Furthermore, the present application provides a reactor system, as shown in fig. 3, comprising a base connection 17, a first reactor 21 and a second reactor 22, wherein the base connection 17 comprises a first interface 18, a second interface 19 and a third interface 20; one port of the first reactor 21 is connected to the first port 18 through a telescopic pipe joint 23; one port of the second reactor 22 is connected to the second interface 19 through a telescopic pipe joint 23; wherein, the first reactor 21 and the second reactor 22 are respectively provided with a reactor connecting piece 2 for connecting with a sealing oil cylinder connecting piece 3 on a piston rod of a sealing oil cylinder 1.

Therefore, in practical use, the reactor system can be used with any of the hydraulic sealing oil circuits in a matched mode, the first reactor and the second reactor can be connected with the sealing oil cylinder connecting pieces on the piston rods of the corresponding sealing oil cylinders through the respective reactor connecting pieces respectively, in this way, the sealing oil cylinders can drive the respective connected reactors to axially move through the telescopic pipe joints, meanwhile, the first bypass switch valve and the second bypass switch valve are closed simultaneously to play a pressure maintaining role in the sealing oil cylinders, hydraulic oil in the sealing oil cylinders is enabled to be static, the pistons in the sealing oil cylinders and external expansion force in the reactors are balanced, and therefore the reactors are sealed stably, reliably and perfectly.

Further, as shown in fig. 3, a first on-off valve 24 is provided at the other port of the first reactor 21; a second switch valve 25 is arranged at the second interface 19; a third on-off valve 26 is arranged at the third interface 20; a fourth switch valve 27 is arranged at the other port of the second reactor 22, wherein the first switch valve 24, the second switch valve 25, the third switch valve 26 and the fourth switch valve 27 can be switched on and off according to the actual use requirement, so that the first reactor 21 and the second reactor 22 can be connected in series, connected in parallel or used independently. Therefore, the reactor system can be used in a variety of ways according to actual needs, for example, the first switch valve 24, the second switch valve 25, the third switch valve 26 and the fourth switch valve 27 are used for controlling the on-off of the pipeline, and the first reactor 21 and the second reactor 22 can be connected in series or in parallel, or can be used independently. When the first switch valve 24, the second switch valve 25, the fourth switch valve 27 are opened and the third switch valve 26 is closed, the first reactor 21 and the second reactor 22 are connected in series; when the first switch valve 24, the third switch valve 26, the fourth switch valve 27 are opened and the second switch valve 25 is closed, the first reactor 21 and the second reactor 22 are connected in parallel; when the first switching valve 24 and the third switching valve 26 are opened and the second switching valve 25 and the fourth switching valve 27 are closed, the first reactor 21 is used alone; when the second and

fourth switching valves

25 and 27 are opened and the first and

third switching valves

24 and 26 are closed, the second reactor 22 is used alone. Therefore, continuous testing of catalyst samples under different working conditions can be realized without stopping the machine, so that the working efficiency is improved, and the testing cost is saved.

Further, the present application provides a denitration catalyst evaluation system including a control unit, a hydraulic seal oil path as described in any of the above, and a reactor system 28 as described in any of the above,

wherein, the reactor connecting pieces 2 of the first reactor 21 and the second reactor 22 are connected with the respective sealed oil cylinder connecting pieces 3;

wherein, the control unit can control the hydraulic sealing oil circuit, so that the first reactor 21 and the second reactor 22 can move close to and away from the base joint 17 under the driving of the respective sealing oil cylinder 1.

The control unit may include a PLC module and a power supply. The control unit is respectively connected with the hydraulic pump, each electric valve and the reversing valve through signal lines, so that the positions of the first reactor 21 and the second reactor 22 are adjusted, and the sealed oil cylinder achieves the pressure maintaining effect. In addition, the PLC module can be connected with the display screen, and the work of hydraulic sealing oil circuit is remotely controlled through a computer.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various features described in the foregoing embodiments may be combined in any suitable manner without contradiction. The invention is not described in detail in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims

1. a reactor system, is characterized in that, comprises:

a base joint (17), the base joint (17) comprising a first interface (18), a second interface (19) and a third interface (20);

a first reactor (21), one port of the first reactor (21) is connected at the first interface (18) through a telescopic pipe section (23);

A second reactor (22), one port of the second reactor (22) is connected at the second interface (19) through a telescopic pipe section (23);

Wherein, the first reactor (21) and the second reactor (22) are respectively provided with a reactor connector ( 2);

A first on-off valve (24) is provided at another port of the first reactor (21);

A second on-off valve (25) is provided at the second interface (19);

A third on-off valve (26) is provided at the third interface (20);

A fourth on-off valve (27) is provided at another port of the second reactor (22);

Wherein, the first switch valve (24), the second switch valve (25), the third switch valve (26) and the fourth switch valve (27) can be turned on and off, so that the first switch valve (25) can be turned on and off. The first reactor (21) and the second reactor (22) can be used in series, in parallel or individually; the reactor system is matched with a hydraulic sealing oil circuit, and the hydraulic sealing oil circuit includes a hydraulic pump (12) and a plurality of hydraulic sealing units (13), wherein,

The hydraulic pump (12) is connected with the oil inlet P of each reversing valve (4) through a third pipeline;

The hydraulic sealing unit comprises a sealing oil cylinder (1) and a reversing valve (4), and the piston rod of the sealing oil cylinder (1) is provided with a sealing oil cylinder connecting piece ( 3); the reversing valve (4) includes an oil inlet P, an oil return port T, an oil port A and an oil port B, and when one of the oil ports A and B is communicated with the oil inlet P, the other The oil port is connected to the oil return port T, the oil port A is communicated with the rodless cavity of the sealed oil cylinder (1) through the first pipeline, and the oil port B is connected to the rod cavity of the sealed oil cylinder (1) through the second pipeline. connected;

The hydraulic sealing unit also includes:

A first check valve (5) is arranged on the first pipeline, a first bypass switch valve (6) is connected in parallel with the first check valve (5), and a second check valve (6) is arranged on the second pipeline. A direction valve (7), the second one-way valve (7) is connected in parallel with a second bypass switch valve (8).

2 . The reactor system according to claim 1 , wherein a throttle member ( 9 ) located between the oil port A and the first check valve ( 5 ) is provided on the first pipeline, 2 . One end of the first bypass switch valve (6) is connected between the throttle member (9) and the first one-way valve (5), and the other end of the first bypass switch valve (6) One end is connected between the first one-way valve (5) and the rodless cavity.

3. Reactor system according to claim 1 or 2, characterized in that the first check valve (5) and the second check valve (7) are arranged for allowing hydraulic oil to flow from the The sealing oil cylinder (1) flows to the reversing valve (4);

and,

The first one-way valve (5) and the first bypass switch valve (6) form a one-way bypass switch valve, the second one-way valve (7) and the second bypass switch The valve (8) is formed as a one-way bypass switch valve.

4. The reactor system according to claim 1, characterized in that the outer peripheral surface of the piston (10) of the sealing oil cylinder (1) and the inner peripheral surface of the cylinder (11) of the sealing oil cylinder (1) The gap between them is 0.6mm-1mm.

5 . The reactor system according to claim 1 , wherein an on-off valve is respectively provided on the third pipeline between the hydraulic pump ( 12 ) and the oil inlet P of each reversing valve ( 4 ). 6 . (14).

6 . The reactor system according to claim 5 , wherein the oil return port T of each reversing valve ( 4 ) is sequentially connected with a fine filter ( 15 ) and an overflow valve ( 16 ) along the oil return direction. 7 . ).

7. A denitration catalyst evaluation system, characterized by comprising a control unit, a hydraulic sealing oil circuit and the reactor system (28) according to any one of claims 1 to 6,

Wherein, the respective reactor connectors (2) of the first reactor (21) and the second reactor (22) are connected to the respective sealed oil cylinder connectors (3);

Wherein, the control unit can control the hydraulic sealing oil circuit, so that the first reactor (21) and the second reactor (22) can approach and move away from the respective sealing oil cylinders (1) driven by the respective sealing oil cylinders (1). The base joint (17) moves.