65results about How to "Prevent excessive evaporation" patented technology

The calibration tool is provided for use with a detector, such as a detector for detecting trace amounts of one or more substances of interest. The calibration tool includes a body with at least one reservoir for retaining the calibration solution therein. A nib projects from the body and communicates with the reservoir. The nib can be wiped across a detection surface and the detection surface then may be presented to a detector. The detector then can be calibrated for the particular substance of interest in the calibration solution. The calibration tool may include plural reservoirs isolated from one another and plural nibs for applying the calibration solution to a detection surface.

The invention discloses a cooking utensil and a control method and device thereof. The control method comprises the following steps: detecting whether the cooking utensil enters a heat preservation state or not; and controlling the cooking utensil to execute a plurality of heat preservation stages after the cooking utensil enters the heat preservation state, wherein the heat preservation temperatures corresponding to the different heat preservation stages are different. The technical problems that in the prior art, after a cooking utensil enters a heat preservation state, the heat preservationtemperature is fixed, high temperature is not beneficial for eating by users, and food is prone to deterioration when the temperature is low are solved.

The invention provides a method and device for producing sodium bicarbonate from acid gas and purifying hydrogen sulfide. The process method uses sodium carbonate solution as the absorption liquid and sodium sulfide solution as the protection liquid, and undergoes absorption reaction, heating, flash evaporation and The four-stage process of solid-liquid separation and gas cooling and collection realizes the discharge of tail gas up to the standard, and produces chemical products that meet the national product quality standards. The process device is composed of a liquid film absorption reactor, a heat exchanger, a flash separation tank and a cooler. The acid gas treatment method and device of the present invention use sodium carbonate and acid gas as raw materials to produce solid sodium bicarbonate and high-purity hydrogen sulfide gas, and realize the dual goals of acid gas purification and pollutant recycling.

The invention discloses an acidic gas reactor. The reactor is divided into three sections from top to bottom. An upper section is a liquid phase storage tank; a middle section is a straight-tube reaction tube and successively comprises, from top to bottom, a feed segment, a contraction segment, a throat pipe segment, an expansion segment and a discharge segment; the lower section is a liquid seal drum with an emptying opening at the lower end, and the liquid seal drum comprises an inner liquid seal drum and an outer liquid seal drum; the upper part of the feed segment and the liquid phase storage tank form a sleeve connection structure and the lower part of the feed segment and the liquid seal drum form a sleeve connection structure; the liquid phase storage tank is provided with a gas phase inlet, the position of the gas phase inlet is higher than an inlet at the upper end of the feed segment, and the sidewall of the liquid phase storage tank is provided with a circulation solution inlet; the tube wall of the straight-tube reaction tube is provided with an absorption liquid inlet which is located at the upper part of a throat pipe; and the inner liquid seal drum and the outer liquid seal drum are in a sleeve connection structure, the inner liquid seal drum is located at the lower part of the discharge segment, and the outer wall of the outer liquid seal drum is provided with a gas phase outlet and a liquid phase outlet. Compared with conventional reactors, the reactor provided by the invention has the advantages of high reaction efficiency, small equipment scale, uneasy obstruction and applicability to absorption reaction of acidic gas and alkali lye.

The invention provides a method and device for preparing sodium hydrosulfide through acidic gas. The method uses sodium hydroxide powder as a raw material, uses process condensed water to prepare a solution, and reacts with part of the product liquid to generate sodium sulfide as an absorption liquid. The five-stage process of absorption reaction, heating, flash decomposition, solid-liquid separation, and gas cooling and collection realizes exhaust emission standards and produces chemical products that meet national product quality standards. The process device is composed of a liquid film absorption reactor, a heating tank, a flash separation tank, a solid-liquid separator, a cooler, a process pipeline and a mechanical pump. The method and device for preparing sodium hydrosulfide from acid gas in the present invention use sodium carbonate and acid gas as raw materials to produce solid sodium bicarbonate and high-purity hydrogen sulfide gas, and realize the dual goals of acid gas purification and pollutant recycling.