Exhibition recommendations.

Gas has become a reality, creating conditions for heating gas boilers or single-family gas stoves. Secondly, in order to solve the contradiction between power supply and demand, the power sector implemented a series of preferential policies on electricity consumption for newly built residential quarters, which reduced the cost of electric heating and made it possible to establish electrified communities. Thirdly, many coal-fired boiler heating units are accelerating the pace of rectification based on environmental protection requirements. Some of them are unconditionally incorporated into the urban thermal network, and they are transformed into gas-fired boiler rooms.

Interest factors for developers and property companies. Since single-unit independent heating does not need to set regional centralized heat source and pipe network, it can simplify the construction process, speed up the construction progress, and facilitate the collection of heating costs, which is favored by developers and property companies. Floor radiant heating, home central air conditioning heating and cooling, etc., because of its ability to charge by household, management and maintenance and Other factors, has become a selling point for many developers.

The immediate requirements of the buyers. Traditional central heating systems have disadvantages such as system imbalance, inconvenient adjustment, poor thermal comfort, and the need for decoration.

Because of the small scale of the system, the new heating system can avoid the uneven heating and cooling of the centralized system. The user can adjust the room temperature according to his own needs. However, due to the good decorative effect, the user does not need secondary decoration, which satisfies the increasing occupants. Decoration requirements; heating combined with summer air conditioning, can create a real indoor environment that is warm in winter and cool in summer, improving thermal comfort. Therefore, the way of decentralized heating single-family measurement has become the choice of many households.

The range of heating equipment has been expanded. Domestic and foreign manufacturers continue to introduce new products for single-family or more dispersed central heating, expanding the range of choices for developers and buyers.

3 Common heating methods technical and economic comparison At present, the main methods of high utilization rate of residential heating in Shijiazhuang City are: household metering new double-tube central heating (heat sink), low-temperature heat 1 status analysis with housing system reform and people The improvement of living standards, especially the development of heating technology, has changed greatly in recent years. The heating method of Shijiazhuang has changed greatly. New heating methods have emerged. The central heating situation of single coal-fired boilers has been broken, and various heating methods have coexisted. The situation is developing. At present, the main heating methods in Shijiazhuang City are as follows: According to the energy structure, there are four ways of burning coal, gas, fuel and electric heating.

Divided by heat source, there are two ways of concentration and dispersion. Among them: centralized heat source heating, including urban heat pipe network, coal-fired boiler room and gas boiler room heating; distributed heat source heating, including single-family gas or electric water heater heating and electric heating.

Divided by heating method, there are two ways of convection heating and radiant heating. Among them: convection heating, including ordinary radiator heating and space convection, hot air heating, such as heaters, air conditioners, gas hot blast stove heating; radiant heating, including low temperature hot water floor radiant heating, gas infrared radiant heating, electric heating film heating and Electric heating floor radiant heating.

According to the comprehensive applicability, there are two methods of single heating and heating and cooling. Among them: a large number of domestic central air conditioning systems combined with a variety of heating systems and summer air conditioning systems.

It can be seen that the heating in Shijiazhuang City is developing in the direction of coexistence of multiple energy sources and various forms, and there has been a comprehensive and applicable multi-faceted situation.

2 Causes of changes in heating methods (1) Changes in energy structure. First of all, the West-East Gas Transmission Project enters the city and expands the city's pipeline gas, so that the new residential quarters use natural gas, coal types, advantages and disadvantages - secondary investment cost, heating period, hot price, scope of application, household metering, new double pipe system (ordinary radiator), easy construction and maintenance The unilateral cost is low and the thermal comfort is good.

Poor decoration, need to be renovated.

The low-temperature hot water floor radiant heating in the middle and low-end residential buildings has uniform temperature field distribution and good thermal comfort, which is conducive to architectural decoration and is conducive to sound insulation of the floor.

The space occupied by the height increases the load, and the separate heat source system materials and the construction market are not mature. The single-family heating of the medium and high-grade residential gas stoves is well regulated, and the heating and hot water supply can be solved at the same time. The air quality of the area is affected, and the fire safety guarantee needs to be strengthened. The multi-storey residential and villa electric heating film single-family heating adjustment is flexible, and the metering and charging is simple.

High energy consumption, not conducive to energy conservation and environmental protection Initial investment in high-energy-saving housing 4 stone city residential heating mode renovation and development recommendations As mentioned above, all kinds of heating methods have their own advantages and disadvantages, but the choice of different angles, different choices. The advantages and disadvantages of heating methods are important factors affecting the development direction of residential heating, but they are not the decisive factors.

With the deepening of urban housing marketization, there are two main factors determining the development of residential heating methods: one is market factors, and the other is government regulation. The interests of developers and the choice of households are market factors. In order to maximize profits, developers tend to invest in low-cost, quick-acting, and well-managed heating methods. Households often choose to invest less and have more functions depending on economic conditions. Heating method with high thermal comfort. Therefore, the decentralized heating system that can meet the requirements of both has its market base for survival and development. However, if it is only based on the market to determine the direction of the development of residential heating in the entire city, it is difficult to ensure its correctness, and even a short-term effect. Therefore, the development of urban residential heating methods must comprehensively consider the comprehensive factors of energy structure, energy efficiency, environmental protection, fire prevention and safety protection according to the overall planning of urban modernization.

The government should formulate active and effective policies to accelerate the pace of residential heating renovation, guide the modernization of new residential heating, and ensure the healthy and rapid development of urban residential heating. According to the basic situation of China's energy, the use of combined heat and power for central heating, the highest primary energy utilization; household gas small boilers followed by electric heating. Therefore, under the current circumstances, the government should control the heating methods such as electric heating film and electric heating as much as possible. It is not possible to blindly promote direct electric heating for the purpose of expanding the power load or one-sided listening manufacturers. For the centralized heating mode of cogeneration, it should be supported and guaranteed from all aspects. As long as it is possible to access the CWR central heating pipe network, it should be accessed. Only when conditions are not allowed, other methods can be considered.

The residential heating method in Shijiazhuang City should do a good job in overall planning, and adhere to the centralized heating method of cogeneration, supplemented by other methods.

While vigorously supporting the centralized heating method of cogeneration, it constantly improves its existing problems and meets the requirements of developers and residents, becoming an inevitable choice for the market.

Accelerate the transformation of existing heating methods that are scattered, high-consumption and seriously polluted, and treat them differently according to the actual conditions of each unit. For example, some governments should adopt coercive measures to renovate within a time limit; some should give financial subsidies or other preferential policies to guide their transformation; even if it is difficult to transform them at a time, they must make their plans and implement them gradually.

Strengthen the scientific and technological research of residential heating, introduce advanced technology and equipment, improve the scientific and technological content, and accelerate the pace of residential heating renovation and development.

In short, as long as the government scientific planning, correct guidance, all units actively cooperate, increase the intensity of transformation and development speed, Shijiazhuang City residential heating modernization can be realized as soon as possible.

Edible Pigment

Food coloring is a kind of pigment, that is, a Food Additive that can be eaten by a proper amount to change the original color to a certain extent.

Food coloring is also divided into natural and synthetic as well as food flavor.

Colorants can be classified into synthetic colorants and natural colorants by source.

According to the solubility of the coloring agent: it can be divided into a fat-soluble coloring agent and a water-soluble coloring agent.

Natural pigments are mostly made from naturally colored plants. These colored plant components, skin, shell, leaf, slag, etc. are often used for comprehensive utilization. It is also made from animals, such as lac dye (cochineal pigment), as well as microbes, such as monascus pigments. In addition to the caramel color, the caramel color is obtained by heating and coking the sugar substance at a high temperature, and is mostly extracted with water or a related solution, further refined, and concentrated and dried. There are also direct application of the colored plant components by drying and pulverizing. It is also produced by biotechnological methods such as tissue culture. There is a method of artificial chemical synthesis to obtain natural-identical colours such as β-carotene, which is chemically stronger than general synthetic pigments.
Natural pigments such as microbial pigments, plant pigments, and mineral pigments extracted from animal and plant tissues and minerals, among which edible foods are called natural food colorings. It is widely used in medicines and foods, and it is allowed to use shellac pigment, safflower yellow pigment, beet red, capsanthin, red yeast rice, turmeric, β-carotene, copper chlorophyllin sodium salt, sauce color and the like. When using food coloring, its color, taste and smell should be coordinated with natural objects or habits.

Edible synthetic pigments generally have bright color, strong coloring power, good stability, no odor and tasteless, uniform quality, easy to dissolve and color, and low cost, and are widely used for coloring of candy, cake color and soft drinks. Lakes are widely used in the manufacture of confectionery, fat-based foods and food packaging materials. Although edible natural pigments can be widely used for coloring a variety of foods, generally the coloring power and stability are not as good as the consumption of synthetic pigments, and the cost is high. Inorganic Pigments are rarely used, and are mostly limited to food surface coloring.

Natural Edible Pigment,Edible Pigment,Tricalcium Phosphate,Additive Boron Citrate

Jinan Huijinchuan Chemical Industry Co., Ltd. , https://www.hjcchemical.com