阅读说明：本技术 液氮泵车直燃式蒸发器的控制方法和系统 (Control method and system for direct-fired evaporator of liquid nitrogen pump truck ) 是由 顾大翔 王林 付俊鹏 张丽 于 2019-11-06 设计创作，主要内容包括：本发明提供了一种液氮泵车直燃式蒸发器的控制方法和系统,涉及设备控制的技术领域,包括：获取待控制蒸发器中液氮的瞬时流量；基于瞬时流量,确定待控制蒸发器的瞬时最大输出功率；基于瞬时最大输出功率,确定出待控制蒸发器中需要的工作缸体数量；基于工作缸体数量向待控制蒸发器发送控制指令,以使待控制蒸发器根据工作缸体数量随机对称开启缸体进行工作,解决了现有的氮泵车直燃式蒸发器控制方法蒸发器的各个缸体使用不均衡及无液氮干烧的技术问题。(The invention provides a control method and a system for a direct-fired evaporator of a liquid nitrogen pump truck, which relate to the technical field of equipment control and comprise the following steps: acquiring the instantaneous flow of liquid nitrogen in an evaporator to be controlled; determining the instantaneous maximum output power of the evaporator to be controlled based on the instantaneous flow; determining the number of working cylinders required in the evaporator to be controlled based on the instantaneous maximum output power; control instructions are sent to the evaporator to be controlled based on the number of the working cylinders, so that the evaporator to be controlled can randomly and symmetrically open the cylinders to work according to the number of the working cylinders, and the technical problems that all cylinders of the evaporator are unbalanced in use and do not have liquid nitrogen to be dried and burnt in the existing control method of the direct-fired evaporator of the nitrogen pump truck are solved.)

1. A control method of a direct-fired evaporator of a liquid nitrogen pump truck is characterized by comprising the following steps:

acquiring the instantaneous flow of liquid nitrogen in an evaporator to be controlled;

determining the instantaneous maximum output power of the evaporator to be controlled based on the instantaneous flow;

determining the number of working cylinders required in the evaporator to be controlled based on the instantaneous maximum output power;

and sending a control instruction to the evaporator to be controlled based on the number of the working cylinders, so that the evaporator to be controlled randomly and symmetrically opens the cylinders to work according to the number of the working cylinders.

2. The method according to claim 1, characterized in that before obtaining the instantaneous flow of liquid nitrogen in the evaporator to be controlled, it further comprises:

acquiring operation information input by a user in a human-computer interface, wherein the operation information is used for representing a forbidden cylinder body in the evaporator to be controlled;

and sending a first forbidding instruction to the evaporator to be controlled based on the operation information so as to enable the forbidden cylinder block to forbid work.

3. The method according to claim 1, wherein sending a control command to the evaporator to be controlled based on the number of working cylinders comprises:

generating random numbers of the number of the working cylinders based on the number of the working cylinders, wherein one random number corresponds to one cylinder of the evaporator to be controlled;

and determining the random number of the working cylinders as the control instruction.

4. The method of claim 1, further comprising:

and if the instantaneous flow of the liquid nitrogen in the evaporator to be controlled is not acquired, sending a second forbidding instruction to the evaporator to be controlled so as to forbid the evaporator to be controlled from working.

5. The method of claim 1, wherein determining an instantaneous maximum output power of the evaporator to be controlled based on the instantaneous flow rate comprises:

calculating the instantaneous maximum output power of the evaporator to be controlled based on the calculation formula of the instantaneous flow and the instantaneous maximum output power, wherein the calculation formula of the instantaneous maximum output power is as follows: w1 is W2 is 1.4Q/F, W1 is the instantaneous maximum output power, W2 is the rated maximum output power of the evaporator to be controlled, Q is the instantaneous flow rate, and F is the rated displacement of the evaporator to be controlled.

6. A control system of a liquid nitrogen pump truck direct-fired evaporator is characterized by comprising: a flow meter, a terminal device, and a communication device, wherein,

the flow meter is used for detecting the instantaneous flow of liquid nitrogen in the evaporator to be controlled;

the terminal equipment is used for determining the instantaneous maximum output power of the evaporator to be controlled based on the instantaneous flow, determining the number of working cylinders required in the evaporator to be controlled based on the instantaneous maximum output power, and generating a control instruction according to the number of the working cylinders;

the communication equipment is used for sending the control instruction to the evaporator to be controlled, so that the evaporator to be controlled randomly and symmetrically opens the cylinders to work according to the number of the working cylinders.

7. The system of claim 6, further comprising:

the display equipment is used for acquiring operation information input by a user in a human-computer interface and sending the operation information to the terminal equipment, wherein the operation information is used for representing a forbidden cylinder body in the evaporator to be controlled;

and the terminal equipment is also used for sending a first forbidding instruction to the evaporator to be controlled based on the operation information after the operation information is acquired, so that the forbidden cylinder body is forbidden to work.

8. The system of claim 6, wherein the terminal device is further configured to:

generating random numbers of the number of the working cylinders based on the number of the working cylinders, wherein one random number corresponds to one cylinder of the evaporator to be controlled;

and determining the random number of the working cylinders as the control instruction.

9. The system of claim 6,

and the terminal equipment is also used for sending a second forbidding instruction to the evaporator to be controlled under the condition that the instantaneous flow of the liquid nitrogen in the evaporator to be controlled is not obtained so as to forbid the evaporator to be controlled from working.

10. The system of claim 6,

the terminal device is further configured to calculate an instantaneous maximum output power of the evaporator to be controlled based on a formula of the instantaneous flow and the instantaneous maximum output power, where the formula of the instantaneous maximum output power is: w1 is W2 is 1.4Q/F, W1 is the instantaneous maximum output power, W2 is the rated maximum output power of the evaporator to be controlled, Q is the instantaneous flow rate, and F is the rated displacement of the evaporator to be controlled.

Technical Field

The invention relates to the technical field of equipment control, in particular to a control method and a control system for a direct-fired evaporator of a liquid nitrogen pump truck.

Background

For a direct-fired evaporator of a liquid nitrogen pump truck, the current mainstream control mode is to adopt an original imported control system or a self-developed control system, the control methods of the two control systems are about how to realize the accuracy and the rapidity of temperature control of the direct-fired evaporator, the direct-fired evaporator is not combined with the environment in which the direct-fired evaporator is applied to carry out further research, and when the evaporator is applied to a liquid nitrogen pump, the problems of dry burning, unbalanced use of each cylinder body, failure operation when a single combustion cylinder is damaged and the like easily occur.

No effective solution has been proposed to the above problems.

Disclosure of Invention

In view of the above, the present invention provides a method and a system for controlling a direct-fired evaporator of a liquid nitrogen pump truck, so as to alleviate the technical problem of unbalanced use of each cylinder of the evaporator in the existing method for controlling a direct-fired evaporator of a liquid nitrogen pump truck.

In a first aspect, an embodiment of the present invention provides a method for controlling a direct-fired evaporator of a liquid nitrogen pump truck, including: acquiring the instantaneous flow of liquid nitrogen in an evaporator to be controlled; determining the number of working cylinders required in the evaporator to be controlled based on the instantaneous maximum output power by determining the instantaneous maximum output power of the evaporator to be controlled based on the instantaneous flow; and sending a control instruction to the evaporator to be controlled based on the number of the working cylinders, so that the evaporator to be controlled randomly opens cylinders to work according to the number of the working cylinders.

Further, before obtaining the instantaneous flow of liquid nitrogen in the evaporator to be controlled, the method further comprises: acquiring operation information input by a user in a human-computer interface, wherein the operation information is used for representing a forbidden cylinder body in the evaporator to be controlled; and sending a first forbidding instruction to the evaporator to be controlled based on the operation information so as to enable the forbidden cylinder block to forbid work.

Further, based on the number of the working cylinders, a control instruction is sent to the evaporator to be controlled, and the method comprises the following steps: generating random numbers of the number of the working cylinders based on the number of the working cylinders, wherein one random number corresponds to one cylinder of the evaporator to be controlled; and determining the random number of the working cylinders as the control instruction.

Further, the method further comprises: and if the instantaneous flow of the liquid nitrogen in the evaporator to be controlled is not acquired, sending a second forbidding instruction to the evaporator to be controlled so as to forbid the evaporator to be controlled from working.

Further, determining the instantaneous maximum output power of the evaporator to be controlled based on the instantaneous flow rate comprises: calculating the instantaneous maximum output power of the evaporator to be controlled based on the calculation formula of the instantaneous flow and the instantaneous maximum output power, wherein the calculation formula of the instantaneous maximum output power is as follows: w1 is W2 is 1.4Q/F, W1 is the instantaneous maximum output power, W2 is the rated maximum output power of the evaporator to be controlled, Q is the instantaneous flow rate, and F is the rated displacement of the evaporator to be controlled.

In a second aspect, an embodiment of the present invention provides a control system for a direct-fired evaporator of a liquid nitrogen pump truck, including: the system comprises a flow meter, a terminal device and a communication device, wherein the flow meter is used for detecting the instantaneous flow of liquid nitrogen in the evaporator to be controlled; the terminal equipment is used for determining the instantaneous maximum output power of the evaporator to be controlled based on the instantaneous flow, determining the number of working cylinders required in the evaporator to be controlled based on the instantaneous maximum output power, and generating a control instruction according to the number of the working cylinders; the communication equipment is used for sending the control instruction to the evaporator to be controlled, so that the evaporator to be controlled randomly and symmetrically opens the cylinders to work according to the number of the working cylinders.

Further, the system further comprises: the display equipment is used for acquiring operation information input by a user in a human-computer interface and sending the operation information to the terminal equipment, wherein the operation information is used for representing a forbidden cylinder body in the evaporator to be controlled; and the terminal equipment is also used for sending a first forbidding instruction to the evaporator to be controlled based on the operation information after the operation information is acquired, so that the forbidden cylinder body is forbidden to work.

Further, the terminal device is also used for generating random numbers of the number of the working cylinders based on the number of the working cylinders, wherein one random number corresponds to one cylinder of the evaporator to be controlled; and determining the random number of the working cylinders as the control instruction.

Further, the terminal device is further configured to send a second disable instruction to the evaporator to be controlled to prohibit the evaporator to be controlled from working under the condition that the instantaneous flow of the liquid nitrogen in the evaporator to be controlled is not obtained.

Further, the terminal device is further configured to calculate an instantaneous maximum output power of the evaporator to be controlled based on a formula of the instantaneous flow and the instantaneous maximum output power, where the formula of the instantaneous maximum output power is: w1 is W2 is 1.4Q/F, W1 is the instantaneous maximum output power, W2 is the rated maximum output power of the evaporator to be controlled, Q is the instantaneous flow rate, and F is the rated displacement of the evaporator to be controlled.

In the embodiment of the invention, firstly, the instantaneous flow of liquid nitrogen in the evaporator to be controlled is obtained; then, based on the instantaneous flow, determining the instantaneous maximum output power of the evaporator to be controlled; then, determining the number of the working cylinders based on the instantaneous maximum output power; and finally, sending a control instruction to the evaporator to be controlled based on the number of the working cylinders so that the evaporator to be controlled randomly opens the cylinders with the number of the working cylinders to work.

In the embodiment of the invention, the instantaneous maximum output power and the number of the working cylinders of the evaporator to be controlled are calculated according to the instantaneous flow of liquid nitrogen in the evaporator to be controlled, then a control instruction is sent to the evaporator to be controlled, so that the evaporator to be controlled randomly opens the working cylinders for working, the adaptability of the evaporator is enhanced through the forbidding function of the fault combustion cylinder, the evaporator can run with a fault, the aim of balanced use of the cylinders of the evaporator to be controlled in the working process is achieved, the problem of unbalanced use of each cylinder of the evaporator in the existing control method of the direct-fired evaporator of the liquid nitrogen pump truck is solved, and the technical effect of prolonging the service life of the direct-fired evaporator of the liquid nitrogen pump truck is achieved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a flowchart of a control method for a direct-fired evaporator of a liquid nitrogen pump truck according to an embodiment of the present invention;

FIG. 2 is a flow chart of a cylinder block disabling method for a direct-fired evaporator of a liquid nitrogen pump truck according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a control system of a direct-fired evaporator of a liquid nitrogen pump truck according to an embodiment of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.