33results about How to "Enough heat exchange area" patented technology

The invention discloses a floating passive cooling device of a spent fuel pool in a nuclear power plant. The passive cooling device at least comprises a heat exchange tube assembly. The heat exchange tube assembly comprises a plurality of heat exchange tubes and a grillwork, wherein the heat exchange tubes are filled with a certain quantity of cooling working media, and certain negative pressure is kept inside each heat exchange tube; the heat exchange tubes are evenly arranged on the grillwork in an equidistant mode, and the grillwork can generate a certain amount of buoyancy in liquid of the spent fuel pool so that the heat exchange tube assembly can float on the liquid level of the spent fuel pool. The portion, placed under the liquid level of the spent fuel pool, of each heat exchange tube is a heat absorption end, and the portion, placed over the liquid level of the spent fuel pool, of each heat exchange tube is a heat release end. The cooling working media are low boiling point working media. The invention further discloses a floating passive cooling system of the spent fuel pool in the nuclear power plant. By implementing the floating passive cooling device and system of the spent fuel pool in the nuclear power plant, operating can be conducted in a completely passive mode, so that safety is improved; the heat radiating area is further increased, and the heat removal capacity is greatly improved; the heat transfer working media can be recycled, and the device and system are environmentally friendly and stable.

The invention discloses a tube bundle heat exchanger comprising a shell forming an annular cavity, wherein a plurality of heat exchange tube rows are arranged in the annular cavity, each of the heat exchange tube rows helically extends along the axial direction of the annular cavity, and the plurality of heat exchange tube rows are staggered in the circumferential direction of the annular cavity.The tube bundle heat exchanger provided by the solution has the advantages of compact structure, light weight and strong heat exchange capacity. It is particularly important that, under the premise ofobtaining the required heat exchange efficiency in the tube bundle heat exchanger, the external heat exchange medium does not need to change the flow direction, that is, enters in the axial direction, and continues to flow in the axial direction inside the annular cavity and finally flows out, thereby avoiding the back and forth turning of the airflow to reduce the flow energy loss of the external heat exchange medium. The tube bundle heat exchanger can also withstand high temperatures and pressures, and can work reliably under conditions that require super heat exchange capacity and in harshworking conditions.

The invention discloses an exposure lighting set and an exposure machine. The exposure lighting set comprises a tube-shaped light source, an inner water jacket, an outer water jacket and a tube-shaped light filter. The inner water jacket sleeves the tube-shaped light source. The outer water jacket sleeves the inner water jacket, thereby a space is formed between the inner and the outer water jackets. The tube-shaped light filter is disposed between the inner and the outer water jackets. The circumferential wall surface area of the tube-shaped light filter is larger than the product of the external diameter circumference and the external diameter length of the tube-shaped light filter. The invention has advantages of providing sufficient heat exchange area; facilitating the cooling system to quickly take away the heat of the tube-shaped light filter.

The invention discloses a multi-fan cooling tower control method, a cooling tower and an air conditioner. The multi-fan cooling tower control method comprises the following steps that the actual wateroutlet temperature tc of the cooling tower is detected, the current environment wet bulb temperature tw is acquired, the middle temperature interval is calculated according to the current environmentwet bulb temperature tw, and the actual water outlet temperature is compared with the middle temperature interval; when the actual water outlet temperature is higher than the middle temperature interval, whether all fans are in an open state or not is judged, if yes, the air speed of the fans are increased, or otherwise the running number of the fans is increased; and / or when the actual water outlet temperature is lower than the middle temperature interval, whether all the fans are at the lowest air speed or not is judged, if yes, the running number of the fans is reduced, or otherwise, the air speed of the fans is reduced. According to the multi-fan cooling tower control method, the cooling tower and the air conditioner, the advantages of being accurate in adjusting effect, simple to control, prominent in energy-saving performance, low in production cost and the like are achieved.

The invention belongs to the technical field of non-metallic material production equipment, and particularly relates to a cooling device for high-temperature calcination production. The cooling device comprises a cooling barrel (1) which comprises a primary cooling section (11) and a secondary cooling section (12), the primary cooling section (11) comprises a material pipe (2) and an air cavity (14), and the secondary cooling section (12) comprises an air pipe (10) and a material cavity (19). The cooling device has the advantages that the heat energy can be sufficiently recovered, and materials can be prevented from being brought into a rotary kiln for secondary overburning through cooling air.

The invention discloses a vaporizer, which comprises a container and a heating device. The container is at least provided with one feed pipe and one discharge pipe; and the heating device is arranged in the container and provided with a group of heat exchange members. The invention also discloses application of the vaporizer in a process of preparing dimethyl ether by dehydrating liquid phase methanol. The vaporizer of the invention has the advantages of high vaporization efficiency, stable operation and control, safe use and convenient maintenance in the process of preparing the dimethyl ether by dehydrating the liquid phase methanol.

The invention discloses a full-premix condensing heat exchanger which comprises a shell and a heat exchanger, wherein the heat exchanger comprises a first heat exchanger and a second heat exchanger; the first heat exchanger is connected with the second heat exchanger along the axial line; a heat flow partition for partitioning the shell into a primary heat exchange chamber and a secondary heat exchange chamber is further arranged in the shell; the second heat exchanger is arranged in the secondary heat exchange chamber; the first heat exchanger comprises first heat exchange pipes distributed along and around the axial line; the first heat exchange pipes are further connected with first fins; due to gaps between the first fins, a first fin group is formed; heat flow generated by combustion of mixed gas in the inner rings of the first fins is stopped by the heat flow partition and then penetrates through the gaps between the first fins to flow into the secondary heat exchange chamber, to exchange heat with the second heat exchanger. By the arrangement of the first fin group in the primary heat exchange chamber, enough heat exchange areas can be reserved between the heat flow and the first fins as well as between the heat flow and the first heat exchange pipes, and a proper gap is reserved between every two adjacent first fins; the heat exchanger is difficult to block and can difficultly corrode the first heat exchange pipes.

The invention discloses a multi-tube moving bed reaction device for preparing ammonia and hydrogen chloride by virtue of pyrolysis separation of ammonium chloride. The multi-tube moving bed reaction device comprises an ammonia releasing device and a chloride releasing device, wherein the ammonia releasing device and the chloride releasing device are respectively provided with one or more feeding holes and discharging holes and are multi-tube moving bed reactors, a solid discharging hole of the ammonia releasing device is connected with a solid feeding hole of the chloride releasing device, and a solid discharging hole of the chloride releasing device is connected with a carrier feeding hole of the ammonia releasing device; and meanwhile, a heat supply channel of the chloride releasing device is connected with a heat supply channel of the ammonia releasing device, the chloride releasing device is heated by virtue of combustion, and the ammonia releasing device is heated by virtue of high temperature flue gas produced after the combustion. According to the multi-tube moving bed reaction device, by mounting a large amount of heat exchanging row tubes in reactors, sufficient heat exchanging areas are provided, and the heat exchanging requirements of pyrolysis of ammonium chloride are met; meanwhile, by utilizing a proper structure and operation conditions, the requirements on the pyrolysis reaction and flow of ammonium chloride are met, and the large-scale continuous industrial production can be realized; and meanwhile, the multi-tube moving bed reaction device can be applied to a sodium carbonate-chloroethylene coproduction process.

The invention discloses a method and a device of hydrogen production by natural gas and steam reforming for micro fuel cells. The device comprises an upper end cover, a reactor body, a reactor upper flange, a reactor outer cylinder, a combustor and a preheating coiled tube, the preheating coiled tube comprises a natural gas preheating tube, a water preheating tube and a gas mixture preheating tube, the upper end cover and the reactor outer cylinder are of hollow cylindrical structures, the preheating coiled tube is arranged in the upper end cover, the reactor body is arranged in the reactor outer cylinder, the combustor is arranged on the lower portion of the reactor body, the reactor body is in flange connection with the reactor outer cylinder and the upper end cover and is of a hollow annular structure with a hollow center, an annular cavity is arranged on the periphery of the hollow center, two baffles are arranged in the annular cavity and divide the annular cavity into a left cavity and a right cavity, gaps are reserved on the lower portions of the baffles, and catalyst particles are distributed in the left cavity and the right cavity. The device is used for preparing synthesis gas by natural gas and steam reforming, and is fast in starting, convenient and feasible to mount and demount and small in size and occupied area.

The invention relates to a compound electromagnetic induction heater of an oil storage tank, in particular to a heater for overcoming the defects of a traditional electrical heated tube. The compound electromagnetic induction heater is especially suitable for rapidly heating crude oil in the oil storage tank of an oil field, is beneficial to oil and water separation, and consists of a power supply, an overtemperature protection temperature controller, an oil temperature display temperature controller, a high-frequency controller, an anti-explosion metal hoses, an oil storage tank, a hoisting hook, a sealing device, an oil temperature sensor, an overtemperature protection sensor, a nichrome heating ring, a high-frequency electromagnetic induction heating ring, a heater box, a heater box machine angle, a high-frequency heating core tube, a nichrome heating core tube and a controller box, wherein wires in the heater box are connected with the temperature controller and the high-frequency controller in the control box through the anti-explosion metal hoses. The compound electromagnetic induction heater has the beneficial effects that enough heat exchange area is ensured, and the heat efficiency is improved; when the core tubes are heated, the crude oil ascends rapidly to perform convective circulation movement, which is beneficial to the oil and water separation, so that the temperature at each part of the oil storage tank is more uniform; and an independent overtemperature protection function is realized, so that safe accidents do not occur.

The invention provides a fresh air unit control system, which includes an internal heat exchanger and an external heat exchanger connected by pipelines, the internal heat exchanger includes a plurality of sub-heat exchangers arranged in parallel, and a plurality of sub-heat exchangers The refrigeration output branch pipelines are connected to the refrigeration output main pipeline, and at least one refrigeration output branch pipeline is provided with a solenoid valve and a one-way valve arranged along the refrigeration direction in parallel. The heat exchanger of the internal unit is composed of multiple sub-heat exchangers connected in parallel. The check valve enables the heat exchanger of the fresh air unit to participate in the refrigeration cycle when the fresh air unit is cooling at low temperature, ensuring sufficient heat exchange area and preventing the compressor from returning liquid and overheating. Hand in frosting. Adjust the opening and closing of the heat exchanger of the internal unit through the solenoid valve, and control the heat exchange opening area of ​​the heat exchanger of the internal unit, so that when the system is heating at low temperature, the heat exchanger of the internal unit can be used as a condenser to close part of the heat exchange circuit, reducing the Condensation effect, increase the condensation pressure, so that the compression ratio of the compressor can be established normally, thus ensuring the safety of the fresh air fan system.

The invention relates to a tower of an internal thermal coupling distillation tower and a control process thereof; the tower realizes the thermal coupling between a rectifying section and a stripping section only by using three external heat exchangers, one external heat exchanger is used for carrying out heat exchange between the top of the rectifying section and the top of the stripping sectionto realize the operation without external reflux of the internal thermal coupling distillation tower. One external heat exchanger is used for carrying out the heat exchange between the bottom of the rectifying section and the bottom of the stripping section, thus realizing the operation without external backheating of the internal thermal coupling distillation tower. One external heat exchanger is used for carrying out exchange between the middle of the rectifying section and the middle of the stripping section, thus realizing the thermal coupling action between the rectifying section and thestripping section. In the invention, the heat exchangers are arranged outside the rectifying section and the stripping section for facilitating the areas of the heat exchangers not to be limited by the distillation process any more, thus ensuring enough heat exchange areas. Due to the heat exchangers arranged at the top of the rectifying section and the bottom of the stripping section, the operation elasticity, dynamic characteristic and controllability of the distillation tower are improved.