CN207375996U - A kind of coke oven coke oven uprising tube evaporator thermometric prior-warning device - Google Patents

Abstract

The utility model discloses a kind of coke oven coke oven uprising tube evaporator thermometric prior-warning devices, have：Tedge；Evaporator is an annular chuck, is sleeved on and rises in pipe outer wall；Water inlet pipe is arranged on evaporator lower part；Outlet pipe is arranged on evaporator top；Also there is temperature element, temperature element is mounted on the evaporator heat exchange layer outer wall of evaporator, prevent that the damage of evaporator water leakage inside coking chamber wall, evaporator water shortage from exploding caused by the reasons such as burning out and blocking the occurrence of.

Description

A coke oven riser tube evaporator temperature measurement and early warning device

technical field

The utility model belongs to the technical field of a waste heat recovery system of a coke oven ascending pipe, in particular to a temperature measuring and early warning device for an evaporator of a coke oven ascending pipe.

Background technique

For a long time, the rising tube vaporization cooling technology has been mainly used in the waste heat recovery of coke oven raw gas at home and abroad. An annular jacket is welded on the outer wall of the riser tube (this device is also called riser tube evaporator). The internal structure is various. Soft water is fed into the lower part of the jacket, and the water in the jacket exchanges heat with the hot raw gas, and the temperature of the gas drops. When the temperature reaches 450-500℃, the water absorbs heat and becomes saturated steam, which is discharged from the upper part of the jacket and sent to the steam drum through the pipeline. After the steam-water separation in the steam drum, the low-pressure saturated steam is connected to the grid, and the water is sent in The lower part of the riser jacket is recycled.

In the process of realizing the utility model, the inventor of the utility model found at least the following problems in the prior art: the current coke oven riser waste heat utilization technology is not yet mature at home and abroad, and large-scale industrial operation is still in the stage of exploration and development. Due to the harsh working conditions on site and immature related materials and design factors, it is easy to cause the internal rupture and leakage of the riser tube evaporator to damage the wall of the coke oven carbonization chamber, and even the occurrence of dangerous situations such as explosion of the evaporator. At present, the riser waste heat recovery system used by several coking plants in the industry is not designed with a matching riser evaporator temperature measurement and early warning device. During use, the evaporator cannot be detected in time due to changes in working conditions, and the internal blockage of the evaporator, water leakage that damages the furnace wall, and the risk of explosion are still uncontrollable. Sudden situations such as excessive pressure or water leakage in the jacket of the riser are prone to occur, which will have a huge impact on the coke oven body and safety production.

Utility model content

The technical problem to be solved by the utility model is to provide a coke oven riser tube evaporator temperature measurement early warning to prevent the occurrence of explosions caused by water leakage inside the evaporator, damage to the furnace wall of the carbonization chamber, evaporator burnout caused by water shortage, and blockage. device.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a coke oven riser tube evaporator temperature measurement and early warning device, which has:

Riser;

An evaporator, which is an annular jacket, is set on the outer wall of the riser;

The water inlet pipe is arranged at the lower part of the evaporator;

The water outlet pipe is arranged on the upper part of the evaporator;

It also has a temperature measuring element installed on the outer wall of the evaporator heat exchange layer of the evaporator.

It also has a PLC and a control system, the PLC is connected with the temperature measuring element through a circuit, and the PLC is connected with the control system through a circuit.

The water inlet pipe is provided with a flow regulating valve.

The upper end of the rising pipe is provided with a bridge pipe tee.

The lower part of the evaporator is also provided with a drain valve.

An early warning method for the above-mentioned coke oven riser tube evaporator temperature measurement early warning device, comprising the following steps:

1) Install a temperature measuring element at the same position on the outer wall of each riser evaporator of the coke oven, measure the temperature T1 of the outer wall of the heat exchange layer of the riser evaporator, and transmit the temperature to the PLC early warning control system;

2) The early warning system collects actual production data on site, establishes the temperature database of the outer wall temperature of each riser evaporator under normal working conditions, and establishes the temperature of the coke oven riser waste heat recovery steam pipe network under different saturated steam pressures through mathematical modeling. The corresponding temperature relationship, under different saturated vapor pressures, the upper limit of the measured temperature is T2;

3) If T1>T2, the control system sends an audible and visual warning signal to the riser evaporator;

4) Operators or engineers and technicians can conduct on-site inspections immediately after receiving the warning signal, find out the cause of the alarm, and make corresponding countermeasures in time according to the supplementary water flow rate in the riser evaporator and the internal wall leakage conditions.

One of the above-mentioned technical solutions has the following advantages or beneficial effects. When the pipeline of the coke oven riser evaporator is blocked, the supply of medium is suddenly stopped, and the riser evaporator leaks, the temperature change of the evaporator is measured in advance. Judging the operating status of the evaporator according to the temperature change, giving an early warning to the waste heat recovery system of the entire coke oven riser tube, reminding the post operators and engineering technicians to check in time and take preventive measures to prevent water leakage inside the evaporator from damaging the furnace wall of the carbonization chamber and evaporation. The occurrence of explosions caused by water shortage, burnout and blockage.

Description of drawings

Fig. 1 is the schematic structural view of the coke oven riser tube evaporator temperature measurement and early warning device provided in the embodiment of the utility model;

Fig. 2 is a control schematic diagram of the coke oven riser tube evaporator temperature measurement and early warning device in Fig. 1;

The marks in the above figures are: 1. rising pipe, 2. evaporator, 21. water inlet pipe, 22. flow regulating valve, 23. water outlet pipe, 24. outer wall of heat exchange layer of evaporator, 25. temperature measuring element, 26 , Sewage valve, 3, bridge pipe tee.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the implementation of the present utility model will be further described in detail below in conjunction with the accompanying drawings.

Referring to Figure 1-2, a coke oven riser tube evaporator temperature measurement and early warning device has:

Riser;

The evaporator, which is an annular jacket, is set on the outer wall of the riser;

The water inlet pipe is arranged at the lower part of the evaporator;

The water outlet pipe is arranged on the upper part of the evaporator;

A temperature measuring element is also provided, and the temperature measuring element is installed on the outer wall of the evaporator heat exchange layer of the evaporator.

It also has a PLC and a control system, the PLC is connected with the temperature measuring element through the circuit, and the PLC is connected with the control system through the circuit.

The water inlet pipe is provided with a flow regulating valve. The upper end of the rising pipe is provided with a bridge pipe tee. There is also a drain valve at the lower part of the evaporator.

The structure of the riser tube evaporator is a jacket type, the central tube side is a cylindrical raw gas channel, the jacket of the tube wall is a steam water channel, the lower part is provided with a desalted cooling water inlet and a sewage outlet, and the upper part is provided with a steam water outlet.

In the case of water cut-off or water leakage of the riser tube evaporator, the metal outer wall of the heat exchange layer of the riser tank evaporator will reduce the heat transfer due to the reduction of water volume, and the temperature of the metal outer wall of the heat exchange layer will also rise accordingly.

Using the above principle, the device installs a temperature measuring element at the same position on the outer wall of each rising tube evaporator of the coke oven, measures the temperature T1 of the outer wall of the heat exchange layer of the rising tube evaporator, and transmits the temperature to the PLC early warning control system through the temperature, and transmits the early warning signal by optical fiber The man-machine screen transmitted to the centralized control room for monitoring and early warning.

Embodiment two

An early warning method for the above-mentioned coke oven riser tube evaporator temperature measurement early warning device, comprising the following steps:

1) Install a temperature measuring element at the same position on the outer wall of each riser evaporator of the coke oven, measure the temperature T1 of the outer wall of the heat exchange layer of the riser evaporator, and transmit the temperature to the PLC early warning control system;

2) The early warning system collects actual production data on site, establishes the temperature database of the outer wall temperature of each riser evaporator under normal working conditions, and establishes the temperature of the coke oven riser waste heat recovery steam pipe network under different saturated steam pressures through mathematical modeling. The corresponding temperature relationship, under different saturated vapor pressures, the upper limit of the measured temperature is T2;

3) If T1>T2, the control system sends an audible and visual warning signal to the riser evaporator;

4) Operators or engineers and technicians can conduct on-site inspections immediately after receiving the warning signal, find out the cause of the alarm, and make corresponding countermeasures in time according to the working conditions such as supplementary water flow in the riser evaporator and inner wall leakage.

Through the above method, an early warning can be given in the case of no water or leakage of the riser evaporator, and the operator can be reminded to check, so as to ensure the stable operation of the waste heat recovery system of the riser of the coke oven.

One of the above-mentioned technical solutions has the following advantages or beneficial effects. When the pipeline of the coke oven riser evaporator is blocked, the supply of medium is suddenly stopped, and the riser evaporator leaks, the temperature change of the evaporator is measured in advance. Judging the operating status of the evaporator according to the temperature change, giving an early warning to the waste heat recovery system of the entire coke oven riser tube, reminding the post operators and engineering technicians to check in time and take preventive measures to prevent water leakage inside the evaporator from damaging the furnace wall of the carbonization chamber and evaporation. The occurrence of explosions caused by water shortage, burnout and blockage.

The utility model has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited by the above-mentioned methods, as long as various insubstantial improvements are made by adopting the method concept and technical solutions of the utility model, or Directly applying the ideas and technical solutions of the utility model to other occasions without improvement is within the protection scope of the utility model.

Claims (5)

1. A coke oven riser tube evaporator temperature measurement and early warning device, characterized in that it has: Riser; An evaporator, which is an annular jacket, is set on the outer wall of the riser; The water inlet pipe is arranged at the lower part of the evaporator; The water outlet pipe is arranged on the upper part of the evaporator; It also has a temperature measuring element installed on the outer wall of the evaporator heat exchange layer of the evaporator. 2. coke oven riser tube evaporator temperature measurement early warning device as claimed in claim 1, is characterized in that, also has PLC and control system, described PLC is connected with described temperature measuring element by circuit, and described PLC is connected with described temperature by circuit. Control system connection. 3. The coke oven riser tube evaporator temperature measurement and early warning device according to claim 2, characterized in that a flow regulating valve is provided on the water inlet pipe. 4. The coke oven riser tube evaporator temperature measurement and early warning device according to claim 3, characterized in that a bridge tube tee is provided at the upper end of the riser tube. 5. The coke oven riser tube evaporator temperature measurement and early warning device according to claim 4, characterized in that, the lower part of the evaporator is also provided with a blowdown valve.